JP2006248329A - Wiper arm - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wiper arm which can prevent the breakage to an arm head in a vicinity of the turning shaft of an arm member from occurring even when an external force is further applied under a lock up back regulated state. <P>SOLUTION: This wiper arm 4 can hold the arm member 20 at a standing posture position by inverting the urging direction at a position in the middle of the turning of the arm member 20 in the separating direction from a wiping surface. In the wiper arm 4, a stopper wall 33 which can selectively regulate the turning of the arm member 20 from a wiping posture position to the standing posture position by the attaching to/detaching from an arm head 10 is provided on a head cover 30. A fastening section 43 on the arm head 10 side of a spring 40 is provided with a contact section 43a which regulates the turning of the arm member 20 by coming into contact with the stopper wall 33. The contact section 43a comes into contact with the stopper wall 33 when the arm member 20 is turned from the wiping posture position in the separating direction from the wiping surface with the head cover 30 fitted on the arm head 10. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a wiper arm, and more particularly to a wiper arm that can be held in a standing posture.

Conventionally, a resin wiper arm is used in a rear wiper device or the like. This wiper arm is normally configured to be able to hold the wiper arm in a fully upright posture by using a spring force, taking into consideration the maintainability such as blade rubber replacement. Yes.
However, in the case of a wiper arm that can be brought into a completely locked back state, for example, when the car wash is performed by the car wash device, the washing object (cloth, brush, etc.) of the car wash device is caught and locked back unintentionally. There is a risk that. In this way, when the vehicle is washed back against the intention, the wiper arm may be damaged by the car wash device.

  In order to prevent this, a wiper arm that is provided with a stopper wall at the tip of the head cover that covers the wiper head and can be controlled so that the arm member can only be rotated to a predetermined position between the wiping posture position and the complete standing posture position. Is known (see, for example, Patent Document 1). In this wiper arm, the head cover can be attached to and detached from the wiper head, and when the head cover is removed, the arm member can be rotated to the fully upright position, but when the head cover is attached, the arm member can be moved away from the wiping surface. When the arm member is turned to the right, the base end portion of the arm member comes into contact with the stopper wall, and the turning of the arm member is restricted at a predetermined position. As described above, in this wiper arm, the lockback which is not intended by the user is selectively controlled by selectively attaching or removing the head cover to the predetermined position or to the complete standing posture position. Thus, the wiper arm can be prevented from being damaged.

JP 2002-362326 A (page 7, FIG. 1-3)

However, in the wiper arm described above, the base end portion of the arm member is brought into contact with the stopper wall of the head cover to restrict the rotation. Therefore, when a large external force is applied to further lock back in the restricted state, the wiper arm is made of resin. In this case, there is a concern that the wiper arm may be damaged near the rotation axis of the wiper arm (the rotation axis of the arm member with respect to the arm head).
In view of the above problems, an object of the present invention is to provide a wiper arm that can prevent the arm member from being in a completely upright posture state by restricting the rotation by bringing the base end portion of the resin arm member into contact with each other. An object of the present invention is to provide a wiper arm that can prevent damage in the vicinity of a rotation axis of an arm member with respect to an arm head even when a large external force for further locking back is applied in the rotation restricted state.

  According to the present invention, the above-described problem is that the arm head fixed to the pivot shaft is connected to the arm shaft so as to be pivotable in the wiping surface contacting / separating direction, and the wiper blade is locked to the tip portion. The arm member made of resin and the arm member and the arm head are engaged with each other, and the arm member is biased with a pressing force toward the wiping surface so that the wiper blade is pressed against the wiping surface in a wiping posture. A pressing means, and the urging direction by the pressing means is reversed to the anti-wiping surface side at a midway position where the arm member is rotated in the wiping surface separation direction from the wiping posture position, and the arm member is in a standing posture. In the wiper arm that can be held in position, the arm head or the arm member can selectively rotate the arm member from the wiping posture position to the standing posture position. A rotation selection means is provided, and a locking portion on the arm head side of the pressing means is provided with a contact portion that contacts the rotation selection means and restricts the rotation of the arm member. The contact portion moves the arm member from the wiping posture position to the wiping surface separation direction when the arm member is not enabled to rotate from the wiping posture position to the standing posture position by the rotation selection unit. When it is rotated, the problem is solved by contacting the rotation selection means.

  As described above, in the present invention, when the rotation selection means does not select the permission of the rotation of the arm member to the standing posture position, the arm member tries to rotate from the wiping posture position to the complete standing posture position. The rotation is blocked by the rotation selection means. At this time, since the abutting portion of the locking portion on the arm head side of the pressing means contacts the rotation selecting means, the turning force of the arm member to the complete standing posture position is applied not only to the arm member but also to the pressing means. It can also be received by contact. As a result, the contact force applied to the contact portion of the arm member with the rotation selection means is relaxed or dispersed, and damage near the rotation axis of the wiper arm (the rotation axis of the arm member with respect to the arm head) can be prevented. it can.

  Further, according to the present invention, the above-described problem is that the arm head fixed to the pivot shaft is connected to the arm shaft so as to be rotatable in the wiping surface contacting and separating direction, and the wiper blade is attached to the tip portion. A resin arm member to be locked, and a pressing force to the wiping surface side is applied to the arm member so that the wiper blade is pressed against the wiping surface in a wiping posture locked to the arm member and the arm head. A pressing means for biasing, wherein the biasing direction by the pressing means is reversed to the anti-wiping surface side at a midway position where the arm member is rotated from the wiping posture position to the wiping surface separation direction, and the arm member is In the wiper arm capable of being held in a standing posture position, the arm head or the arm member is selectively rotated by the arm member from the wiping posture position to the standing posture position. A rotation restricting means that can be controlled, and an abutting portion that abuts against the rotation restricting means and restricts the rotation of the arm member is provided at the locking portion on the arm head side of the pressing means. The contact portion is configured to move the arm member from the wiping posture position to the wiping surface separation direction when the rotation of the arm member from the wiping posture position to the standing posture position is restricted by the rotation restricting means. This is solved by coming into contact with the rotation restricting means when rotated.

  As described above, in the present invention, when the rotation of the arm member in the wiping surface separation direction is restricted by the rotation restricting means, the rotation restriction is applied when the arm member tries to turn from the wiping posture position to the complete standing posture position. The rotation is prevented by means. At this time, since the abutting portion of the locking portion on the arm head side of the pressing means contacts the rotation restricting means, the turning force of the arm member to the complete standing posture position is applied not only to the arm member but also to the pressing means. It can also be received by contact. As a result, the contact force applied to the contact portion of the arm member with the rotation restricting means is alleviated or dispersed, and damage near the rotation axis of the wiper arm (the rotation axis of the arm member with respect to the arm head) can be prevented. it can.

  Further, according to the present invention, the above-described problem is that the arm head fixed to the pivot shaft is connected to the arm shaft so as to be rotatable in the wiping surface contacting and separating direction, and the wiper blade is attached to the tip portion. A resin arm member to be locked, and a pressing force to the wiping surface side is applied to the arm member so that the wiper blade is pressed against the wiping surface in a wiping posture locked to the arm member and the arm head. And a detachable cover member that covers the arm head, and the urging direction of the pressing means is reversed at a midway position when the arm member is rotated from the wiping posture position to the wiping surface separation direction. In the wiper arm that is inverted to the wiping surface side and can hold the arm member in the standing posture position, the cover member is attached to and detached from the arm head by A rotation restricting portion capable of selectively restricting the rotation of the arm member from the wiping posture position to the standing posture position is provided, and a locking portion on the arm head side of the pressing means is provided with the rotation An abutting portion that abuts on the regulating portion and regulates the rotation of the arm member is provided, and the corresponding contact portion is configured to move the arm member from the wiping posture position in a state where the cover member is mounted on the arm head. When it is rotated in the wiping surface separation direction, it is solved by contacting the rotation restricting portion.

  Thus, in the present invention, when the rotation of the arm member in the wiping surface separation direction is restricted by the rotation restriction portion of the cover member, the arm member tries to turn from the wiping posture position to the complete standing posture position. The rotation is prevented by the rotation restricting portion. At this time, since the abutting portion of the locking portion on the arm head side of the pressing means contacts the rotation restricting portion, the turning force of the arm member to the complete standing posture position is not only applied to the arm member but also the pressing means. It can also be received by contact. As a result, the contact force applied to the contact portion of the arm member with the rotation restricting portion is alleviated or dispersed, and damage near the rotation axis of the wiper arm (the rotation axis of the arm member with respect to the arm head) can be prevented. it can.

  Specifically, the rotation restricting portion provided on the cover member can be a rotation restricting protrusion formed to protrude from the inner surface of the cover main body that covers the arm head. Thus, by forming the rotation restricting protrusion on the cover member, the rotation of the arm member can be restricted when the cover member is attached to the arm head, and when the cover member is removed from the arm head, the rotation of the arm member can be controlled. The restriction of movement can be released.

  Further, it is preferable that the cover member is pivotally connected to the arm head by a hinge portion. With this configuration, the cover member can be easily switched between a state where the rotation of the arm member is restricted and a state where the restriction is released by opening and closing the cover member with respect to the arm head. Further, it is possible to prevent the cover member from being lost or forgotten to be attached at the time of removal.

  Further, when the arm member is rotated in the wiping surface separation direction from the wiping posture position, the base end portion of the arm member has the rotation selection means, the rotation restriction means, or the At substantially the same time as contacting the rotation restricting portion of the cover member, it extends from the engaging portion so as to contact the rotation selecting means, the rotation restricting means, or the rotation restricting portion of the cover member. It is preferable that With this configuration, the rotational force of the arm member is received substantially simultaneously by the base end portion of the arm member and the abutting portion of the pressing means, so that the abutting force is dispersed and the rotation axis of the wiper arm (the arm member with respect to the arm head) Can be prevented from being damaged near the rotation axis.

  Further, the abutting portion is configured to move within a rotation range from the wiping posture position of the arm member to an intermediate position where the urging direction by the pressing means is reversed to the anti-wiping surface side, It is preferable that the rotation restricting means or the rotation restricting portion of the cover member is brought into contact with the rotation restricting portion so as to restrict the rotation of the arm member in the wiping surface separating direction. With this configuration, the arm member is wiped in a state where the abutting portion of the pressing means is in contact with the rotation selecting means, the rotation restricting means, or the rotation restricting portion of the cover member and the rotation of the arm member is restricted. Since the arm member is biased to the surface side, the arm member returns to the wiping surface side when the external force in the wiping surface separation direction with respect to the arm member is released, so that the contact force applied to the arm member is also released.

Further, the pressing means has the hook-shaped locking portions at both ends of the coil portion of the coil spring, and the contact portion extends from the hook-shaped locking portions on the arm head side. The rotation selection means, the rotation restriction means, or the rotation restriction portion of the cover member can be brought into contact. In this way, the contact portion can be formed by extending from the hook-shaped locking portion, so that it can be easily manufactured.
Such a wiper arm may be applied to a rear wiper device of a vehicle.

  According to the wiper arm of the present invention, it is possible to relieve or disperse the load applied to the arm member in a state where the rotation in the wiping surface separation direction is restricted, so that the vicinity of the rotation shaft of the arm member relative to the arm head Can be prevented from being damaged.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The members, arrangements, and the like described below are not intended to limit the present invention and can be variously modified within the scope of the gist of the present invention.
1 to 6 relate to an embodiment of the present invention, FIG. 1 is a perspective view of the wiper device, FIG. 2 is a sectional view of the wiper arm of FIG. 1 in a wiping posture, and FIG. 3 is a view of the wiper arm of FIG. 4 is an exploded explanatory view of the head cover and the arm head, FIG. 4 is a sectional view of the wiper arm of FIG. 1 in a state where the rotation of the wiper arm is restricted, FIG. 5 is a sectional view of the wiper arm of FIG. It is a schematic diagram for demonstrating a moving state.
7 to 12 relate to another embodiment of the present invention. FIGS. 7 and 8 are cross-sectional views of the wiper arm, FIG. 9 is an explanatory view of a spring, and FIG. 10 is a cross-sectional view of the head cover and arm head of the wiper arm. FIG. 11 is an exploded view of the head cover and arm head of the wiper arm, and FIG. 12 is an explanatory view of the head cover and arm head of the wiper arm.

  Below, the example which applied this invention to the wiper arm of the rear wiper apparatus mounted in a vehicle is shown. As shown in FIG. 1, the rear wiper device W of this example includes a rear wiper motor 2 as a driving source, a pivot shaft 3 that rotates at a reduced speed around an axis when the rear wiper motor 2 is driven, and a tip portion of the pivot shaft 3. The wiper arm 4 that is fixed to the rear glass 1 and performs a wiping motion along the rear glass 1 (see FIG. 2), and the wiper blade 5 that is connected to the tip of the wiper arm 4 and wipes the rear glass 1 are the main components.

The wiper arm 4 of this example is made of resin, and is connected to an arm head 10 fixed to the pivot shaft 3 so as to be rotatable in the wiping surface contact / separation direction with respect to the arm head 10, and the wiper blade 5 swings at the tip. The arm member 20 that is movably hinged, and the arm member 20 is pressed by the arm member 20 toward the rear glass 1 so that the wiper blade 5 is pressed against the rear glass 1 in a wiping posture. The main component is a spring 40 as a pressing means for imparting.
The wiper blade 5 of this example has a tournament type holding structure, and a long and rubber blade rubber 5c is held by holding claws 5b formed at the ends of a plurality of levers 5a. .

  Next, the main part structure of the wiper arm 4 is demonstrated based on FIG. The arm head 10 of this example is made of resin, and the distal end portion of the pivot shaft 3 is inserted into the base end portion 11 and is fastened and fixed by a fastening nut 3a. Further, a support shaft 13 is provided so as to connect the both side wall portions 12 to the side wall portion 12 extending from the both sides in the width direction of the base end portion 11 to the distal end side (arm member 20 side). The support shaft 13 is provided so as to be substantially orthogonal to the pivot shaft 3. Further, the arm member 20 is integrally formed with a pedestal portion 15 having a pin-like spring locking portion 14 between the support shaft 13 and the base end portion 11 and below the support shaft 13. Yes.

A long arm member 20 is connected to the distal end portion of the arm head 10 via a support shaft 13. The arm member 20 is made of resin, and is formed in a substantially U-shaped cross-section with the bottom surface opened. The base end 21 side of the arm member 20 is thickened, and a substantially U-shaped attachment recess 22 into which the support shaft 13 can be inserted is formed in the base end 21. Further, a substantially U-shaped spring locking portion 23 is integrally formed on the distal end side of the arm member 20.
The spring 40 of this example includes a coil portion 41 and hook-shaped locking portions 42 and 43 formed at both ends of the coil portion 41.

The arm member 20 is engaged with the spring locking portion 23 of the arm member 20 and the spring locking portion 14 of the arm head 10 with the locking portions at both ends in a state where the support shaft 13 of the arm head 10 is inserted into the mounting recess 22. 42 and 43 are rotatably attached to the arm head 10 so as to be hooked. That is, the arm member 20 is connected to the arm head 10 so as to be rotatable about the support shaft 13 in the wiping surface contact direction (arrow A direction in FIG. 2).
FIG. 2 shows a state in which the arm member 20 is held at the wiping posture position where the wiper blade 5 connected to the tip portion is in contact with the surface of the rear glass 1. In this wiping posture, the line connecting the spring locking portions 14 and 23 (that is, the point of application of the urging force of the spring 40) is positioned on the lower side with respect to the support shaft 13. Therefore, the support shaft 13 is moved by the spring 40. Due to the tensile force applied between the arm member 20 and the arm head 10 through the arm member 20, a pressing force toward the rear glass 1 surface side is applied to the arm member 20.

As shown in FIG. 3, the arm head 10 is detachably mounted with a resin head cover 30 as a cover member that functions as a rotation selection means or a rotation restriction means. The head cover 30 of this example is detachable as necessary, but is attached to the arm head 10 in order to improve the appearance design of the wiper arm 4 when taking the wiping posture state.
The head cover 30 of this example has an upper wall portion 31 that covers the upper side of the arm head 10 and a peripheral wall that extends from the periphery of the upper wall portion 31 except the edge portion facing the arm member 20 and covers the side portion of the arm head 10. The unit 32 is provided. The upper wall portion 31 is formed with a substantially U-shaped cutout portion 31a having an opening on the distal end side (arm member 20 side). The head cover 30 is integrally formed with a stopper wall 33 as a rotation restricting portion so as to protrude from the inner surface of the upper wall portion 31 to the vicinity of the upper portion of the spring locking portion 14. The stopper wall 33 is a tongue-shaped rotation restricting protrusion that extends from an edge on the back side (longitudinal center side) of the notch 31a.

  In addition, a pair of support shafts 32a are formed on the inner side of the peripheral wall portion 32 so as to project on the arm member 20 side, and a pair of shaft support holes 12a are formed in the side wall portion 12 of the arm head 10 correspondingly. Is formed. By inserting these support shafts 32a into the shaft support holes 12a, the head cover 30 is attached to the arm head 10 so as to be rotatable around the support shaft 32a. In addition, a pair of locking projections 32b are formed on the inner side in the longitudinal direction of the peripheral wall 32, and a notch recess 12b is formed on the lower edge of the side wall 12 of the arm head 10 correspondingly. ing. When the head cover 30 is in the closed state, the locking protrusion 32b of the head cover 30 is elastically locked to the notch recess 12b of the arm head 10, so that the head cover 30 is not inadvertently opened. At this time, the stopper wall 33 is inserted between the side wall portions 12 of the arm head 10.

  In the present invention, the fact that the head cover can be attached to and detached from the arm head includes not only the head cover that is completely removed from the arm head, but also those that can be opened and closed while being connected to the arm head as in this example. It is. However, the head cover 30 of this example can be easily removed from the arm head 10 by disengaging the engaging protrusion 32b from the notch recess 12b and removing the support shaft 32a from the shaft support hole 12a.

  As shown in FIG. 4, the stopper wall 33 is arranged on the rotation trajectory (circular trajectory centered at the point O) Y of the base end upper end (regulator) 21 a of the arm member 20 centering on the support shaft 13. In the state where the head cover 30 is mounted on the arm head 10, the base end upper end 21 a abuts (interferences) the stopper wall 33 when the arm member 20 rotates a predetermined angle in the wiping surface separation direction. It is supposed to be. The wiper arm 4 of this example is set so that a pressing force toward the rear glass 1 surface side is applied to the arm member 20 at a rotation angle at which the base end upper end 21a contacts the stopper wall 33.

The base end upper end 21 a is the upper end of the rear end (pivot shaft 3 side) of the base end 21, and has the largest radius when the arm member 20 rotates about the support shaft 13. This is the part where the trajectory is drawn. The abutting force when the proximal end upper end 21 a abuts against the stopper wall 33 is supported by the stopper wall 33 and also supports the back surface of the stopper wall 33 via the stopper wall 33 by the support surface 11 a. It is supported also by the part 11.
On the other hand, the pedestal 15 is also disposed on the rotation track Y, and when the head cover 30 is not attached to the arm head 10, the arm member 20 rotates in the wiping surface separation direction as shown in FIG. Then, the base end upper end 21a can be rotated until it contacts (interferences) with the top surface of the pedestal 15 without contacting the base end 11 of the arm head 10. In the wiper arm 4 of this example, at the rotation angle at which the base end upper end 21a contacts the pedestal 15, a pressing force is applied to the arm member 20 in the direction away from the rear glass 1 surface, and the arm member 20 is held in the standing posture. Is set to

  As described above, in the wiper arm 4 of this example, by mounting the head cover 30 on the arm head 10, the rotation of the arm member 20 with respect to the arm head 10 is regulated at a predetermined angle (the standing of the arm member 20 with respect to the arm head 10). A state where rotation to the posture position is not permitted). Further, by removing the head cover 30 from the arm head 10, the restriction of the rotation of the arm member 20 with respect to the arm head 10 to a predetermined angle is released (the rotation of the arm member 20 to the standing posture position with respect to the arm head 10 is not performed). Allowed state). As described above, the rotation of the arm member 20 can be selected or restricted by attaching and detaching the head cover 30.

  As shown in FIG. 2, in the spring 40 of this example, the hook-shaped locking portion 43 wraps around the spring locking portion 14 from the rear glass 1 surface side, and the spring locking portion 14 and the lower end portion of the stopper wall 33 are The end portion is locked to the spring locking portion 14 so as to be positioned in front of the stopper wall 33 (in a direction away from the pivot shaft 3). And the contact part 43a is formed in the latching | locking part 43 of this example so that it may extend to the radial direction outer side from the edge part. The contact portion 43a of this example is formed by bending the end portion of the locking portion 43 outward in the radial direction. In the wiping posture, the contact portion 43a is spaced from the stopper wall 33 around the spring locking portion 14 rather than the stopper wall 33. positioned.

  As shown in FIG. 4, when the arm member 20 rotates in the wiping surface separation direction, the contact portion 43 a also rotates with the arm member 20. When the proximal end upper end 21 a comes into contact with the stopper wall 33, the contact part 43 a is also brought into contact with the contact surface 33 a formed at the distal end of the stopper wall 33 almost simultaneously. Thus, in the wiper arm 4 of this example, the head cover 30 is attached to the arm head 10 and the rotation of the arm member 20 is restricted to a predetermined angle (the rotation of the arm member 20 to the standing posture position is allowed). In a state where the arm member 20 is rotated by a predetermined angle with respect to the arm head 10, both the base end upper end 21 a of the arm member 20 and the abutting portion 43 a of the spring 40 abut against the stopper wall 33. Thus, even when an external force is further applied in the wiping surface separation direction from the state in which the rotation of the arm member 20 is restricted (FIG. 2), the load is applied only between the base end upper end 21a and the stopper wall 33 by this external force ( Since a load (contact force) is also applied between the contact portion 43a and the stopper wall 33 without concentration of the contact force), the load is reduced or dispersed. As the load is relaxed or dispersed in this manner, the base end upper end 21a of the resin arm member 20 and the stopper wall 33 of the head cover 30 that are in the vicinity of the rotation shaft of the arm member 20 with respect to the arm head 10 are formed. It is possible to prevent damage.

  In this example, the contact portion 43a is set so that the contact between the base end upper end 21a and the contact portion 43a to the stopper wall 33 is substantially simultaneous. You may set so that 43a may contact | abut with the stopper wall 33 early. With this configuration, when the arm member 20 rotates in the wiping surface separation direction, the contact portion 43a first contacts the stopper wall 33 and the arm member 20 rotates in the wiping surface separation direction. Is regulated. In this state, when further external force is applied, the spring 40 is extended and the contact portion 43a and the stopper wall 33 are kept in contact with each other, and then the base end upper end 21a is in contact with the stopper wall 33. You can touch. Thus, the load by external force can be supported in two steps.

FIG. 6 is a schematic diagram for explaining the rotation of the wiper arm 4 of this example. The point O in FIG. 6 corresponds to the support shaft 13 of the arm head 10. S1 and S2 correspond to the spring locking portions 14 and 23, which are the points of application of the urging force of the tension spring 40, respectively.
In FIG. 2, the wiper arm 4 is in the wiping posture state, and the line segment connecting the spring locking portions 14 and 23 is located below the support shaft 13, so that the arm member 20 is biased in the wiping surface approaching direction by the pressing force. The

Here, when the car wash apparatus is used with the wiper arm 4 in the wiping posture, the washing object (cloth, brush, etc.) of the car wash apparatus is caught on the wiper arm 4 without the user's knowledge, and is shown in FIG. Thus, the wiper arm 4 may be rotated in the wiping surface separation direction.
In this case, in this example, not only the base end upper end 21 a of the arm member 20 but also the contact portion 43 a of the spring 40 contacts the stopper wall 33 of the head cover 30, and the wiping surface is separated around the support shaft 13 of the arm member 20. Rotation in the direction is restricted. Therefore, in the wiper arm 4 of this example, it is possible to prevent the load from being concentrated only on the base end upper end 21a of the arm member 20 and damaging this part. In a state where the rotation is restricted, the urging force toward the wiping surface is applied to the arm member 20, so that the arm member 20 returns to the wiping posture position when the cleaning object is removed.

On the other hand, the wiper arm 4 is not fully used for maintenance such as replacement of the blade rubber 5c, or for the purpose of preventing deformation (sagging) of the blade rubber 5c or preventing malfunction due to freezing of the wiper blade 5. When it is desired to be in the standing posture state (lockback state), the head cover 30 that is elastically locked to the arm head 10 is first removed from the arm head 10 as shown in FIG.
After the head cover 30 is removed, the arm member 20 is rotated around the support shaft 13 in the wiping surface separation direction. In this case, in FIG. 6, the point O corresponding to the support shaft 13 and the point S1 corresponding to the spring locking portion 14 on the arm head 10 side are immovable, and S2 corresponding to the spring locking portion 23 on the arm member 20 side. Only the point rotates about the arc T as the movement locus around the point O.

  When the arm member 20 reaches the midway (moderation) position rotated from the wiping posture position R1 by the rotation angle θ1 in the wiping surface separation direction, the three points of the O point, the S1 point, and the S2 point are positioned on the same straight line Q. The The urging direction of the spring 40 is reversed from the wiping surface approaching direction to the wiping surface separating direction with the rotation angle θ1 as a boundary. In the region A (less than the rotation angle θ1) from the wiping posture position R1 of the wiper arm 4 to the moderation position (straight line Q), the urging force in the wiping surface approaching direction acts on the wiper arm 4 and the moderation position (straight line Q). ) To a complete standing posture position R2 in the region B (rotation angle θ1 to rotation angle θ2), the urging force in the wiping surface separation direction acts on the wiper arm 4. In the wiper arm 4 of this example, the rotation restricting position shown in FIG.

When the wiper arm 4 exceeds the moderation position (straight line Q), the urging direction of the spring 40 is switched to the wiping surface separation direction, and therefore, the wiper arm 4 has the base end upper end 21a of the arm member 20 at the base portion 15 of the arm head 10. It is rotated along the arc T until it comes into contact with the top surface of the. That is, the rotation of the wiper arm 4 in the wiping surface separation direction is restricted by the proximal end 21a of the arm member 20 coming into contact with the top surface of the pedestal 15 of the arm head 10. The rotation angle of the wiper arm 4 at this time is θ2, and the state of the wiper arm 4 at this time is a complete standing posture state (lockback state) shown in FIG.
If the wiper arm 4 is brought into a complete standing posture in this way, maintenance work such as replacement work of the blade rubber 5c can be easily performed, or deformation (sagging) of the blade rubber 5c can be prevented, It is possible to effectively prevent malfunction due to freezing of the wiper blade 5.

  Further, the wiper arm 4 of this example is used in a rear wiper device W of a vehicle, and the rear glass 1 as a wiping surface is disposed at a relatively steep angle. To turn. Further, the rear wiper device W is usually disposed in a state exposed to the outside of the vehicle body. Therefore, there is a high possibility that the cleaning object of the cleaning device is caught by the wiper arm 4 from the side surface side of the wiper arm 4. However, the wiper arm 4 of this example is rotated by causing the upper end 21a of the base end portion 21a of the arm member 20 and the abutting portion 43a of the spring 40 to abut against the stopper wall 33 that restricts rotation in the wiping surface separating direction. Since the movement is restricted, the load applied to the wiper arm 4 can be dispersed and supported without being concentrated in one place, and the wiper arm 4 can be prevented from being damaged.

The wiper arm 4 of this example may be modified as follows. In addition, about the component substantially the same as the said embodiment, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.
In the embodiment described above, the contact portion 43a provided on the spring 40 is formed so as to extend linearly outward from the end of the hook-shaped locking portion 43, but the present invention is not limited thereto. 7A, it may be formed so as to extend in a substantially semicircular shape from the end of the locking portion 43 outward in the radial direction. Further, in the above embodiment, the stopper wall 33 is formed with the flat contact surface 33a so as to fit the linear contact portion 43a. However, the present invention is not limited to this, and the substantially semicircular contact surface is formed. The contact surface 33a may be formed in a curved surface so as to fit the portion 43a.
By making the contact portion 43a into a substantially semicircular shape and the contact surface 33a into a curved shape in this way, as shown in FIG. 7B, the arm member 20 is rotated and the contact portion 43a is contacted. When abutting on the contact surface 33a, the arm member 20 can be restricted from rotating by reliably engaging the both.

Further, as shown in FIG. 8A, the contact portion 43a may be formed by linearly extending the end portion of the locking portion 43 forward (to the arm member 20 side). Further, the contact surface 33a of the stopper wall 33 is not formed in front of the stopper wall 33 (on the arm member 20 side) as in the above embodiment, but is formed by extending the lower end surface of the stopper wall 33 in a planar shape. May be.
Even if formed in this way, as shown in FIG. 8B, when the arm member 20 is rotated, the contact portion 43a is brought into contact with the contact surface 33a to restrict the rotation of the arm member 20. can do.

  Moreover, in the said embodiment, although the contact part 43a was formed by bending the edge part of the latching | locking part 43, you may form as FIG. 9 not only in this but. In FIG. 9, the contact part 43a is formed by once bending the end part of the locking part 43 outward in the radial direction and further folding back at a position of a predetermined length protruding outward in the radial direction from this state. . Thus, by forming the contact part 43a by being folded twice, the rigidity of the contact part 43a can be increased and the rotation of the arm member 20 can be more reliably regulated.

  Further, in the above embodiment, the head cover 30 is rotatably attached to the arm head 10 with the support shaft 32a formed near the end on the arm member 20 side as the rotation center. 10 may be formed. In the example shown in FIG. 10, a mounting portion 16 is formed on the base end portion 11 of the arm head 10 so as to extend on the opposite side to the arm member 20, and the head cover 30 has a peripheral wall portion 32 opposite to the arm member 20. A portion located on the side is hinge-coupled to the attachment portion 16 by a hinge pin 16a. Therefore, the head cover 30 of this example can be opened and closed by rotating around the hinge pin 16 a with respect to the arm head 10. When the head cover 30 is closed, the stopper wall 33 is inserted between the side wall portions 12.

  In the above embodiment, the head cover 30 having the stopper wall is attached to the arm head 10, but not limited to this, as shown in FIG. 11, the cover member 50 having the stopper wall 53 is attached to the arm member 20. You may comprise. That is, in the example of FIG. 11, a resin head cover 30 is detachably attached to the arm head 10. However, the stopper wall is not formed in the head cover 30 of this example. The head cover 30 extends from the periphery of the upper wall portion 31 except for the upper wall portion 31 covering the upper side of the arm head 10 and the edge portion facing the arm member 20, as in the above embodiment. A peripheral wall portion 32 that covers the side portion is provided, and a substantially U-shaped cutout portion 31 a having an open front end side (arm member 20 side) is formed in the upper wall portion 31.

  The head cover 30 is inserted into a pair of shaft support holes 12a formed in the side wall portion 12 of the arm head 10 by inserting a pair of support shafts 32a that are coaxially projected from the inside of the peripheral wall portion 32. It is attached to the arm head 10 so as to be rotatable around the support shaft 32a. In addition, a pair of locking projections 32 b formed on the inner side in the longitudinal direction of the peripheral wall portion 32 is elastically locked to a notch recess 12 b formed on the lower edge of the side wall portion 12 of the arm head 10. Thus, the head cover 30 can cover the arm head 10 in a closed state.

And in this example, the cover member 50 for covering the upper surface and side surface of the base end part 21 of the arm member 20 is separately arrange | positioned. The cover member 50 of this example functions as a rotation selection unit or a rotation restriction unit. The cover member 50 includes an upper wall portion 51 that covers the upper surface of the base end portion 21, and side wall portions 52 that extend from the edge of the upper wall portion 51 and cover both side surfaces of the base end portion 21. The upper wall portion 51 is formed so as to protrude into the cutout portion 31 a of the head cover 30.
A stopper wall 53 is formed on the lower surface of the upper wall portion 51 so as to protrude downward. Since the stopper wall 53 is the same as the stopper wall 33 described above, the description thereof is omitted. In addition, a pair of support shafts 52 a are formed so as to protrude coaxially from the inner surface of the side wall portion 52. Correspondingly, a shaft support hole 21 c is formed on the outer surface of the base end portion 21.

The cover member 50 of this example is attached to the arm member 20 by inserting the support shaft 52a into the shaft support hole 21c. When attached to the arm member 20, the stopper wall 53 is inserted between the side wall portions 12 of the arm head 10.
In this example, the base end portion 21 of the arm member 20 is formed with a step portion 21 b having a thickness of about the plate thickness of the cover member 50. The step portion 21b is formed so that the cover member 50 and the arm member 20 are substantially flush with each other when the cover member 50 is closed.
Thus, the cover member 50 having the stopper wall 53 may be disposed on the arm member 20.

  Further, in the above embodiment, the head cover 30 that substantially covers the upper surface and side surfaces of the arm head 10 is mounted. However, the present invention is not limited to this, and as shown in FIG. You may comprise so that 60 may be attached to an arm head main-body part. In the example shown in FIG. 12, the cap 60 is formed in a cap shape so as to cover the upper surface of the base end portion 11 of the arm head 10. The cap 60 of the present example covers an upper wall portion 61 that covers the upper portion of the pivot shaft 3 and the fastening nut 3a, and extends downward from an edge portion of the upper wall portion 61 to cover the tip portion of the pivot shaft 3 and the side surface of the fastening nut 3a. A side wall 62 and a stopper wall 63 extending downward from the end of the upper wall 61 on the arm member 20 side are provided. Since the stopper wall 63 of this example is the same as the stopper wall 33 of the above embodiment, the description thereof is omitted.

The cap 60 of this example has locking claws 62 a formed so as to extend radially inward from the lower end portion of the side wall portion 62 at several locations. The cap 60 of this example is mounted so as to cover the pivot shaft 3 from above the arm head 10, thereby holding the locking claw 62 a between the upper surface of the arm head 10 and the lower surface of the fastening nut 3 a. It can be elastically attached to the arm head 10. Therefore, the cap 60 can be easily removed by disengaging the locking claws 62a. When the cap 60 is attached to the arm head 10, the stopper wall 63 is inserted between the side wall portions 12 of the arm head 10.
Thus, the cap 60 as the rotation selection means or the rotation restriction means does not cover substantially the entire arm head 10, and the cap 60 as one configuration of the arm head 10 is connected to the pivot shaft 3 of the arm head 10. You may comprise so that it may attach to the fastening fixing | fixed part.
In the above embodiment, the wiper arm 4 is made of resin, but it is possible to form it with a thermoplastic resin in which glass fibers are homogeneously mixed in polyethylene terephthalate resin, such as strength, rigidity, low moisture absorption, moldability, weather resistance, etc. It is excellent in this aspect and is preferable.

It is a perspective view of the wiper device concerning one embodiment of the present invention. It is sectional drawing in the wiping attitude | position of the wiper arm of FIG. FIG. 2 is an exploded explanatory view of a head cover and an arm head of the wiper arm of FIG. 1. It is sectional drawing in the rotation control state of the wiper arm of FIG. It is sectional drawing in the standing posture of the wiper arm of FIG. It is a schematic diagram for demonstrating the rotation state of the wiper arm of FIG. It is sectional drawing of the wiper arm which concerns on other embodiment of this invention. It is sectional drawing of the wiper arm which concerns on other embodiment of this invention. It is explanatory drawing of the spring which concerns on other embodiment of this invention. It is a section explanatory view of the head cover and arm head of the wiper arm concerning other embodiments of the present invention. FIG. 6 is an exploded explanatory view of a head cover and an arm head of a wiper arm according to another embodiment of the present invention. It is explanatory drawing of the head cover and arm head of the wiper arm which concern on other embodiment of this invention.

Explanation of symbols

1. Rear glass, 2. Rear wiper motor, 3. Pivot shaft, 3a ... Fastening nut,
4. Wiper arm, 5. Wiper blade, 5a ... Lever, 5b ... Holding claw,
5c ... blade rubber, 10 ... arm head, 11 ... base end, 11a ... support surface,
12 ... Side wall part, 12a ... Shaft support hole, 12b ... Notch recess, 13 ... Support shaft,
14, 23... Spring locking portion, 15. Base portion, 16. Mounting portion, 16 a... Hinge pin,
20 ... arm member, 21 ... base end, 21a ... top end of base end, 21b ... step,
21c: shaft support hole, 22: mounting recess, 30: head cover, 31: upper wall,
31a ... notch, 32 ... peripheral wall, 32a ... support shaft, 32b ... locking protrusion,
33 ... Stopper wall, 33a ... Contact surface, 40 ... Spring, 41 ... Coil part,
42, 43 ... locking part, 43a ... contact part, 50 ... cover member, 51 ... upper wall part,
52... Side wall portion, 52 a... Support shaft, 53. Stopper wall, 60.
61 ... Upper wall part, 62a ... Locking claw, 62 ... Side wall part, 63 ... Stopper wall,
W: Rear wiper device

Claims (9)

An arm head fixed to the pivot shaft;
A resin arm member that is rotatably connected to the wiping surface contacting / separating direction with respect to the support shaft of the arm head, and the wiper blade is locked to the tip portion;
Pressing means for urging the arm member with a pressing force toward the wiping surface so that the wiper blade is pressed against the wiping surface in a wiping posture engaged with the arm member and the arm head,
It is possible to hold the arm member in the standing posture position by reversing the urging direction by the pressing means to the anti-wiping surface side in the middle position where the arm member is rotated from the wiping posture position to the wiping surface separation direction. In the wiper arm
The arm head or the arm member is provided with a rotation selection means that selectively enables rotation of the arm member from the wiping posture position to the standing posture position,
The locking portion on the arm head side of the pressing means is provided with an abutting portion that abuts on the rotation selecting means and restricts the rotation of the arm member,
The abutting portion moves the arm member from the wiping posture position to the wiping surface separation direction when the arm member is not enabled to rotate from the wiping posture position to the standing posture position by the rotation selection unit. A wiper arm that abuts against the rotation selecting means when rotated. An arm head fixed to the pivot shaft;
A resin arm member that is rotatably connected to the wiping surface contacting / separating direction with respect to the support shaft of the arm head, and the wiper blade is locked to the tip portion;
Pressing means for urging the arm member with a pressing force toward the wiping surface so that the wiper blade is pressed against the wiping surface in a wiping posture engaged with the arm member and the arm head,
It is possible to hold the arm member in the standing posture position by reversing the urging direction by the pressing means to the anti-wiping surface side in the middle position where the arm member is rotated from the wiping posture position to the wiping surface separation direction. In the wiper arm
The arm head or the arm member is provided with a rotation restricting means capable of selectively restricting the rotation of the arm member from the wiping posture position to the standing posture position,
The engaging portion on the arm head side of the pressing means is provided with an abutting portion that abuts on the rotation restricting means and restricts the rotation of the arm member,
The contact portion moves the arm member from the wiping posture position to the wiping surface separation direction when the rotation of the arm member from the wiping posture position to the standing posture position is restricted by the rotation restricting means. A wiper arm that abuts against the rotation restricting means when rotated. An arm head fixed to the pivot shaft;
A resin arm member that is rotatably connected to the wiping surface contacting / separating direction with respect to the support shaft of the arm head, and the wiper blade is locked to the tip portion;
A pressing means for urging the arm member with a pressing force toward the wiping surface so that the wiper blade is pressed against the wiping surface in a wiping posture engaged with the arm member and the arm head;
A removable cover member covering the arm head,
It is possible to hold the arm member in the standing posture position by reversing the urging direction by the pressing means to the anti-wiping surface side in the middle position where the arm member is rotated from the wiping posture position to the wiping surface separation direction. In the wiper arm
The cover member is provided with a rotation restricting portion capable of selectively restricting the rotation of the arm member from the wiping posture position to the standing posture position by attaching and detaching the cover member to the arm head,
The locking portion on the arm head side of the pressing means is provided with a contact portion that contacts the rotation restricting portion and restricts the rotation of the arm member,
The contact portion contacts the rotation restricting portion when the arm member is rotated in the wiping surface separation direction from the wiping posture position in a state where the cover member is mounted on the arm head. And wiper arm.   4. The wiper arm according to claim 3, wherein the rotation restricting portion provided on the cover member is a rotation restricting protrusion formed to protrude from an inner surface of a cover main body that covers the arm head.   The wiper arm according to claim 3 or 4, wherein the cover member is rotatably connected to the arm head by a hinge portion.   When the arm member is rotated from the wiping posture position in the wiping surface separation direction, the base end portion of the arm member is the rotation selection means, the rotation restriction means, or the cover member. At the same time as contacting the rotation restricting portion, the rotation selecting means, the rotation restricting means, or the cover member is extended from the locking portion so as to contact the rotation restricting portion. The wiper arm according to any one of claims 1 to 5, wherein:   The contact portion is configured to rotate the rotation selection means and the rotation within a rotation range from the wiping posture position of the arm member to a midway position where the urging direction by the pressing means is reversed to the counter wiping surface side. 7. The device according to claim 1, wherein the arm member is set to abut against the rotation restricting portion of the cover member and restrict the rotation of the arm member in the wiping surface separation direction. The wiper arm according to claim 1. The pressing means has the hook-shaped locking portions at both ends of the coil portion of the coil spring,
The contact portion extends from the hook-shaped locking portion on the arm head side so as to be able to contact the rotation selection portion, the rotation restriction portion, or the rotation restriction portion of the cover member. The wiper arm according to any one of claims 1 to 7, wherein The wiper arm according to any one of claims 1 to 8, wherein the wiper arm is applied to a rear wiper device of a vehicle.

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