JP7684574B2 - Handle and work machine - Google Patents

Description

The present invention relates to a handle and a work machine to which the handle is attached.

As an example of a work machine, a power tool has been proposed that has a motor, a tool tip, a work machine body that supports the motor and the tool tip, and a handle that is held by the operator.

As an example of the power tool described above, Patent Document 1 discloses a power tool that includes a sub-handle that is attached to the work machine body, and the sub-handle is attached to the work machine body by a band.

JP 2020-32491 A

In the power tool described above, the sub-handle is immovably fixed via a band to the mount attached to the work machine body.

As a result, vibrations transmitted from the work machine body to the mount during operation are transmitted directly to the sub-handle, and the vibrations are then transmitted to the operator, resulting in poor workability.

The object of the present invention is to provide a handle and a work machine that improves workability.

The handle of the present invention has a mount member that abuts against a work machine body, a handle member that abuts against and is fixed to the mount member, and a fixing part that is provided inside the mount member and the handle member and fixes the handle member to the mount member, wherein the fixing part extends inside the mount member and the handle member along an axial direction, and the handle member has a support part that supports the fixing part, a grip part that is disposed outside the support part in a radial direction centered on the axis and is gripped by an operator, and a first connection part that is located between the support part and the grip part in the radial direction and connects the support part and the grip part. The first connection portion has an axial length shorter than those of the support portion and the grip portion, and is positioned on one side of the axial direction relative to the grip portion of the handle member, and the support portion has a cylindrical abutment portion that abuts against the mount member in the axial direction, a second connection portion that is positioned on the other side of the abutment portion in the axial direction and connects to the first connection portion in the radial direction, and a cylindrical third connection portion that is positioned between the abutment portion and the second connection portion and connects the abutment portion and the second connection portion in the axial direction, and the third connection portion includes a portion whose radial size is smaller than that of the abutment portion, and the grip portion is spaced apart from the mount member in a direction along the axial direction.
Another handle of the present invention is a handle having a mount member that abuts against a work machine body, a handle member that abuts against and is fixed to the mount member, and a fixing part that is provided inside the mount member and the handle member and fixes the handle member to the mount member, wherein the fixing part extends inside the mount member and the handle member along an axial direction, and the handle member has a support part that supports the fixing part, a grip part that is disposed outside the support part in a radial direction about the axis and is gripped by an operator, and a handle member that is fixed to the work machine body by a fixing part that is provided inside the mount member and the handle member along an axial direction. and a connection portion located between the support portion and the grip portion and connecting the support portion and the grip portion, the mount member is arranged on one side of the handle member in the axial direction relative to the grip portion, the connection portion has an axial length shorter than the support portion and the grip portion and is arranged on one side of the handle member in the axial direction relative to the grip portion, the support portion has an open end extending on the other side in the axial direction beyond the connection portion, and the handle member has a space portion between the grip portion and the open end in the radial direction.

Further, a working machine of the present invention is a working machine having a working machine body, a tool tip attached to the working machine body and extending along an axis, a drive mechanism for driving the tool tip, and a handle attached to the working machine body and held by an operator, the handle having a mount member that abuts against the working machine body, a handle member that abuts against and is fixed to the mount member, and a fixing portion that is provided inside the mount member and the handle member and fixes the handle member to the mount member, the fixing portion extending inside the mount member and the handle member along the axial direction, the handle member having a support portion that supports the fixing portion, a grip portion that is disposed outside the support portion in a radial direction about the axis, and a grip portion that is disposed outside the support portion in the radial direction. and a first connection portion located between the support portion and the grip portion and connecting the support portion and the grip portion, the first connection portion having an axial length shorter than that of the support portion and the grip portion and being arranged on one side of the axial direction relative to the grip portion of the handle member, the support portion having a cylindrical abutment portion abutting the mount member in the axial direction, a second connection portion located on the other side of the axial direction relative to the abutment portion and connecting radially to the first connection portion, and a cylindrical third connection portion located between the abutment portion and the second connection portion and connecting the abutment portion and the second connection portion in the axial direction, the third connection portion including a portion whose radial size is smaller than that of the abutment portion, and the grip portion is spaced apart from the mount member in a direction along the axial direction.

The present invention can improve the operability of the handle and the work machine.

FIG. 2 is a cross-sectional view showing the structure of a sub-handle and a working machine according to an embodiment of the present invention. 2 is an external view showing a structure of a sub-handle provided in the work machine shown in FIG. 1. FIG. 3 is a side view showing the structure of the sub-handle shown in FIG. 2 . FIG. 3 is a cross-sectional view showing a structure of the sub-handle shown in FIG. 2 . 5A is a cross-sectional view taken along line AA; FIG. 5C is a cross-sectional view taken along line BB; and FIG. 5C is a cross-sectional view taken along line CC. FIG. 5 is a perspective view showing a structure of the sub-handle shown in FIG. 4 . 3A and 3B are cross-sectional views showing the structure of the sub-handle shown in FIG. 2, in which FIG. 3A shows the structure before deformation and FIG. FIG. 2 is a cross-sectional view showing the structure of the sub-handle of the first embodiment of the present invention. FIG. 11 is a cross-sectional view showing the structure of a sub-handle according to a second embodiment of the present invention. FIG. 11 is a cross-sectional view showing the structure of a sub-handle according to a third embodiment of the present invention. FIG. 13 is a cross-sectional view showing the structure of a sub-handle according to a fourth embodiment of the present invention. FIG. 13 is a cross-sectional view showing the structure of a sub-handle according to a fifth embodiment of the present invention. FIG. 13 is a cross-sectional view showing the structure of a sub-handle according to a sixth embodiment of the present invention. FIG. 14 is a perspective view showing a structure of a grip portion of the sub-handle shown in FIG. 13 . FIG. 13 is a cross-sectional view showing the structure of a sub-handle according to a seventh embodiment of the present invention. 16A to 16C are diagrams showing the structure of each cut surface of the sub-handle shown in FIG. 15, where (a) is a GG cross-sectional view, (b) is an HH cross-sectional view, and (c) is an LL cross-sectional view.

An example of an embodiment of the present invention will be described in detail below with reference to the drawings.

In this embodiment, a hammer drill is used as an example of a work machine, and this hammer drill and a sub-handle (handle) that is attached to the hammer drill are described.

The use of the hammer drill according to this embodiment is not particularly limited, but it is suitable for chipping objects such as concrete walls and stone, or for crushing objects.

As shown in FIG. 1, a hammer drill (working machine) 10 can detachably mount a tip tool 8 such as a bit. The hammer drill 10 has a working machine body 1, a drive unit (drive mechanism) 4 arranged on the lower side of the working machine body 1, and a main handle unit 2 connected to the working machine body 1. The working machine body 1 is composed of a cylinder housing 1a, an intermediate housing 1b, and a motor housing 1c, which are fixed to each other and integrated. The cylinder housing 1a is cylindrical as a whole. The intermediate housing 1b and the motor housing 1c are arranged between one longitudinal end of the cylinder housing 1a and the main handle unit 2. In the following description, the longitudinal direction of the cylinder housing 1a is defined as the front-rear direction P1. In addition, of the longitudinal sides of the cylinder housing 1a, the side where the intermediate housing 1b and the motor housing 1c are arranged is defined as the rear, and the opposite side is defined as the front. That is, the intermediate housing 1b and the motor housing 1c are arranged between the rear end of the cylinder housing 1a and the main handle unit 2.

The intermediate housing 1b and the motor housing 1c are stacked one on top of the other, with one end of the main handle section 2 connected to the motor housing 1c and the other end of the main handle section 2 connected to the intermediate housing 1b. In the following description, the other end of the main handle section 2 connected to the intermediate housing 1b is defined as the upper end, and the one end of the main handle section 2 connected to the motor housing 1c is defined as the lower end. In other words, the direction in which the main handle section 2 extends is defined as the up-down direction Q1 perpendicular to the front-rear direction P1. In addition, the direction perpendicular to both the front-rear direction and the up-down direction is defined as the left-right direction R1.

A sub-handle 20, which is another handle separate from the main handle 2, is attached to the work machine body 1, and when chipping or crushing objects, the worker often handles the main handle 2 and the sub-handle 20 to perform the work.

The cylinder housing 1a also contains a cylindrical cylinder 17 and a retainer sleeve 25. The cylinder 17 and the retainer sleeve 25 are concentric, and the tip tool holder 7, which is part of the retainer sleeve 25, protrudes from the tip of the cylinder housing 1a. The cylinder 17 and the retainer sleeve 25 are engaged so as to be unable to rotate relative to each other, and when a rotational force is transmitted to the cylinder 17, the cylinder 17 and the retainer sleeve 25 rotate together with the axis C1 as the rotation axis. A part of the tip tool 8 is inserted into the tip tool holder 7 of the retainer sleeve 25, and the tip tool 8 is supported by the retainer sleeve 25. The tip tool 8 inserted into the tip tool holder 7 of the retainer sleeve 25 engages with the retainer sleeve 25 so as to be unable to move in the rotational direction, but to be able to move within a predetermined range in the front-rear direction P1. Therefore, when the cylinder 17 and the retainer sleeve 25 rotate, the tool holder 7 of the retainer sleeve 25 also rotates, which transmits a rotational force to the tool 8, causing the tool 8 to rotate. When an impact force is transmitted to the tool 8, the tool 8 reciprocates in a predetermined range in the forward and backward direction P1. In other words, the tool 8 has a generally cylindrical shape that extends along the axis C1 direction described below, and is a bit that operates in the forward and backward direction P1 by the driving force of the motor 19 to perform the desired work.

The piston 9 and striker 22 are housed in the cylinder 17 so that they can reciprocate. In addition, the second hammer 24 is housed between the cylinder 17 and the retainer sleeve 25 so that it can reciprocate. The piston 9, striker 22, and second hammer 24 are lined up in this order from the rear to the front of the cylinder 17. Furthermore, an air chamber 23 is provided between the piston 9 and the striker 22 in the cylinder 17.

The drive unit 4 in the motor housing 1c houses an electric motor 19, which is a power source. In other words, the motor 19 is supported by the motor housing 1c. The motor 19 is, for example, an inner rotor type brushless motor, and has a cylindrical stator 19a, a rotor 19b arranged inside the stator 19a, and an output shaft 19c arranged inside the rotor 19b. The output shaft 19c is fixed to the rotor 19b and extends vertically through the rotor 19b. The central axis of the output shaft 19c is perpendicular to the central axes of the cylinder 17 and the retainer sleeve 25.

The upper part of the output shaft 19c protruding from the rotor 19b penetrates the partition between the motor housing 1c and the intermediate housing 1b and enters the inside of the intermediate housing 1b. A fan 19d is provided on the upper end side of the output shaft 19c protruding into the intermediate housing 1b, and a pinion gear 19e is provided on the upper end. Inside the intermediate housing 1b, a first drive shaft 30 is rotatably arranged on one side of the output shaft 19c, and a second drive shaft 40 is rotatably arranged on the other side of the output shaft 19c. The output shaft 19c, the first drive shaft 30, and the second drive shaft 40 are parallel to each other.

A first gear 31 that meshes with the pinion gear 19e is provided at the bottom of the first drive shaft 30, and an eccentric pin 32 is provided at the top of the first drive shaft 30. This eccentric pin 32 is connected to the piston 9 via a connecting rod 33. In other words, the connecting rod 33 and the piston 9 are provided as the reciprocating mechanism 18.

A second gear 41 that meshes with the pinion gear 19e is provided at the bottom of the second drive shaft 40, and a bevel gear 42 is provided at the top of the second drive shaft 40, which meshes with a ring gear 43 that is arranged around the cylinder 17. The ring gear 43 is attached to the outer periphery of the cylinder 17 via a sliding bearing (metal) and rotates freely relative to the cylinder 17.

In addition to the ring gear 43, a clutch 44 is provided on the outer circumferential surface of the cylinder 17. The clutch 44 rotates integrally with the cylinder 17 and slides independently in the axial direction (front-rear direction) of the cylinder 17.

A power cable 3 is attached to the lower end of the main handle 2, and the power cable 3 is connected to a commercial power source. The main handle 2 is provided with a trigger switch 6 that is turned on and off by a trigger 5. When the operator operates the trigger 5, the motor 19 is activated. When the motor 19 is activated, the rotation of the output shaft 19c is transmitted to the first drive shaft 30 via the pinion gear 19e and the first gear 31, causing the first drive shaft 30 to rotate.

When the first drive shaft 30 rotates, the eccentric pin 32 provided at the upper end of the first drive shaft 30 rotates around the central axis of the first drive shaft 30. That is, the eccentric pin 32 revolves around the central axis of the first drive shaft 30. As a result, the piston 9 connected to the eccentric pin 32 via the connecting rod 33 reciprocates in the cylinder 17. When the piston 9 moves in a direction away from the striker 22, that is, when the piston 9 retreats, the pressure in the air chamber 23 decreases, and the striker 22 retreats. On the other hand, when the piston 9 moves in a direction approaching the striker 22, that is, when the piston 9 advances, the pressure in the air chamber 23 increases, and the striker 22 advances. When the striker 22 advances, the second hammer 24 is struck by the striker 22, and the tip tool 8 is struck by the second hammer 24. In this way, the impact force is intermittently transmitted to the tip tool 8.

When the second drive shaft 40 rotates, the bevel gear 42 provided at the upper end of the second drive shaft 40 rotates, and the ring gear 43 meshing with the bevel gear 42 rotates. The rotation of the ring gear 43 is then transmitted to the cylinder 17 via the clutch 44, and the cylinder 17 and the retainer sleeve 25 rotate together. Thus, the tip tool 8 held in the retainer sleeve 25 receives an intermittent impact force and a continuous rotational force. This allows the tip tool 8 to perform the desired work on the target object.

Next, the sub-handle 20 attached to the work machine body 1 of the hammer drill 10 will be described. In this embodiment, as shown in FIG. 1, the sub-handle 20 is attached to the work machine body 1 along the up-down direction Q1. However, it goes without saying that the attachment direction of the sub-handle 20 to the work machine body 1 may be in any direction in the outer circumferential direction of the work machine body 1 shown in FIG. 2, and the attachment direction of the sub-handle 20 can be appropriately determined by the operator. For example, the sub-handle 20 may be attached so that the axis D1 of the sub-handle 20 is parallel to the left-right direction R1 of the work machine body 1.

The sub-handle 20 shown in Figures 1 to 6 has a mount member 21 that abuts against the work machine body 1, a handle member 34 that abuts against and is fixed to the mount member 21, and a fixing portion that is provided inside the mount member 21 and the handle member 34 and fixes the handle member 34 to the mount member 21. As shown in Figure 4, the fixing portion is a bolt 27 and a nut 28 that are screwed together. The bolt 27 and the nut 28, which are the fixing portions, extend along the axis D1 direction of the mount member 21 and the handle member 34. The bolt 27 engages with the work machine body 1 via a metal band 26.

Here, a portion of the band 26 is arranged so that it is wrapped around a part of the outer periphery of the work machine body 1, and the heads 27b of the bolts 27 are engaged with both ends of the band 26 at positions away from the work machine body 1. Also, as shown in Figures 2 and 3, one side of the mounting member 21 is provided with a depth gauge attachment portion 29 to which a depth gauge used for setting the machining depth of the hammer drill 10 can be attached.

4, the handle member 34 has a support portion 35 that supports the bolt 27 and the nut 28, a grip portion 36 that is arranged outside the support portion 35 in the radial direction T1 centered on the axis D1 and is gripped by the operator, and a first connection portion 37 that is located between the support portion 35 and the grip portion 36 in the radial direction T1 and connects the support portion 35 and the grip portion 36. In other words, the handle member 34 is composed of a cylindrical support portion 35, a cylindrical grip portion 36 that is arranged outside the support portion 35 in the radial direction T1, and a first connection portion 37 that connects the support portion 35 and the grip portion 36. In other words, the cylindrical support portion 35 is arranged inside the cylindrical grip portion 36, and further, a metal nut 28 and a metal bolt 27 are arranged inside the cylindrical support portion 35. The bolt 27 is inserted through the through hole 21c at the end of the mount member 21 and the through hole 35d of the support portion 35, and is disposed from the inside of the mount member 21 to the inside of the support portion 35. The nut 28 is cast into the resin support portion 35. In other words, the bolt 27 engaged with the band 26 and the nut 28 cast into the support portion 35 are screwed together.

As a result, when the gripping portion 36 is rotated in a predetermined direction around the axis D1, the support portion 35 (nut 28) moves upward (towards the work machine body 1) due to the screw connection, and the support portion 35 presses the mount member 21 against the work machine body 1. Meanwhile, the bolt 27 moves downward (away from the work machine body 1) due to the screw connection, pulling the band 26 downward. In other words, the mount member 21 is pressed against the work machine body 1, and at the same time, the movement of the bolt 27 pulls the band 26 so that it is in close contact with the work machine body 1, thereby fixing the sub-handle 20 including the mount member 21 and the handle member 34 to the work machine body 1. Note that multiple ribs 21b that apply tension to the band 26 are provided inside the mount member 21, so that the band 26 wrapped around the work machine body 1 does not loosen and spread out. To change the attachment direction of the sub-handle 20 relative to the work machine body 1, the grip 36 is rotated around the axis D1 in the direction opposite to the specified direction, and the support 35 is moved downward and the bolt 27 is moved upward to loosen the band 26 wrapped around the work machine body 1.

In addition, in the handle member 34, the first connection portion 37, which is a portion that connects the support portion 35 and the grip portion 36 in the radial direction T1, has a length in the direction along the axis D1 direction that is shorter than that of the support portion 35 and the grip portion 36. In other words, in the direction along the axis D1 direction, a space portion 48 is formed between the support portion 35 and the grip portion 36 below the first connection portion 37. Specifically, as shown in the cross-sectional structure of FIG. 5(a), a space portion 48 is formed along the circumferential direction U1 between each of the annular support portions 35 and the grip portion 36. Therefore, the first connection portion 37 has a short length in the direction along the axis D1 direction. In other words, the first connection portion 37 is a portion that is relatively narrow in width and has a shape that is easily deformed.

In addition, in the sub-handle 20, the grip portion 36 of the handle member 34 is spaced from the mount member 21 in the direction along the axis D1. Specifically, a brim-shaped flange 36a that protrudes in the radial direction T1 is provided at the end of the grip portion 36 on the mount member 21 side, and the end face 36b of the flange 36a is spaced from the end face 21a of the mount member 21. In other words, since there is a space between the flange 36a and the mount member 21, when the first connection portion 37 is deformed, the movement of the flange 36a is not hindered, and the flange 36a can move freely to a certain extent. In other words, the first connection portion 37 is easily deformed because the flange 36a is spaced from the mount member 21.

Next, the structure of the support portion 35 will be described in detail. The support portion 35 is cylindrical, and has a cylindrical abutment portion 35a that abuts against the mount member 21, a cylindrical second connection portion 35b that connects to the first connection portion 37, a cylindrical third connection portion 35c that is located between the abutment portion 35a and the second connection portion 35b and connects the abutment portion 35a and the second connection portion 35b, and a cylindrical fourth connection portion 35g that is connected to the second connection portion 35b and is located on the open end side. That is, the abutment portion 35a, the third connection portion 35c, the second connection portion 35b, and the fourth connection portion 35g are arranged in this order along the axis D1 from the mount member 21 side, and the first end portion 35e of the abutment portion 35a abuts against the mount member 21. On the other hand, the second end portion 35f of the fourth connection portion 35g is an open end. The nut 28 is supported across the third connection portion 35c, the second connection portion 35b, and the fourth connection portion 35g. At least the third connection portion 35c includes a portion whose size in the radial direction T1 is smaller than that of the abutment portion 35a. As shown in the cross-sectional structure of FIG. 5(c), the diameter L1 of the narrowest portion 35i of the third connection portion 35c is smaller than the diameter L2 of the abutment portion 35a (L1<L2). In the sub-handle 20 of this embodiment shown in FIG. 4, the first connection portion 37 is also cylindrical, and includes a portion whose size in the radial direction T1 is smaller than that of the abutment portion 35a.

Furthermore, the sub-handle outer peripheral surface (handle outer peripheral surface) 20a consisting of the end face 36b of the grip portion 36 facing the mount member 21, the outer peripheral surface 37a of the first connection portion 37, and the outer peripheral surface 35h of the third connection portion 35c is a smooth surface 20b consisting of a flat surface and a curved surface. In other words, since the sub-handle outer peripheral surface 20a consisting of the end face 36b of the grip portion 36, the outer peripheral surface 37a of the first connection portion 37, and the outer peripheral surface 35h of the third connection portion 35c is a smooth surface 20b without unevenness, it is possible to suppress the formation of cracks on the sub-handle outer peripheral surface 20a even when the first connection portion 37 is deformed. In addition, inside the support portion 35, the bolt 27 and the nut 28 extend over the entire axis D1 direction of the support portion 35. For this reason, the support portion 35 is configured so as not to deform in either the front-rear direction P1 or the left-right direction R1; specifically, the second connection portion 35b and the third connection portion 35c are configured so as not to deform.

Here, as shown in FIG. 4 and FIG. 5(b), in the handle member 34, the support portion 35, the grip portion 36, and the first connection portion 37 are integrally formed of resin. In detail, the grip portion 36 includes an inner grip portion 36c made of the first resin 36d shown in FIG. 4, and an outer grip portion 36e made of the second resin 36f having a lower hardness than the first resin 36d, and the grip portion 36 has a two-layer structure made of the inner grip portion 36c and the outer grip portion 36e. As a result, as shown in FIG. 6, the inner grip portion 36c, the first connection portion 37, and the support portion 35 are integrally formed of the same resin. Note that since the outer grip portion 36e is the portion that the operator grasps, it is preferable that it is made of a soft resin such as elastomer. On the other hand, the inner grip portion 36c is made of a resin having a higher hardness than the elastomer, thereby increasing the rigidity of the handle member 34.

According to the sub-handle 20 of this embodiment, as shown in FIG. 4, in the handle member 34, the cylindrical grip portion 36 provided on the outside and the cylindrical support portion 35 provided inside the grip portion 36 are connected by the first connection portion 37 having a short length, and when vibration occurs in the work machine body 1, the vibration propagates to the support portion 35 to which the nut 28 is attached, and the support portion 35 vibrates. However, in addition to the shape of the first connection portion 37 being easily deformed, the flange 36a and the mounting member 21 are spaced apart, which allows the flange 36a to move, thereby deforming the first connection portion 37. When the first connection portion 37 deforms, the vibration is less likely to propagate to the outer grip portion 36. Here, as shown in FIG. 7(a), when an impact force occurs along the impact direction E1 in the hammer drill 10 (see FIG. 1), a load F1 is applied to the mounting member 21 and the band 26. In this case, in the hammer drill 10 of this embodiment, as shown in FIG. 7(b), even if the mount member 21 and the band 26 are displaced by the load F1, the first connection portion 37 of the handle member 34 deforms, suppressing the displacement of the outer grip portion 36, thereby reducing the vibration transmitted to the grip portion 36. This reduces the vibration transmitted to the operator, improving the operability of the sub-handle 20.

In addition, by providing the sub-handle 20 on the hammer drill 10, the operability of the hammer drill 10 can also be improved.

In addition, in the region between the flange 36a and the mount member 21, the third connection portion 35c of the support portion 35 includes a portion whose radial T1 size is smaller than that of the abutment portion 35a. If the radial T1 size of the third connection portion 35c is as large as that of the abutment portion 35a and the first connection portion 37, the rigidity of the third connection portion 35c will hinder the deformation of the first connection portion 37, but the third connection portion 35c disposed between the first connection portion 37 and the abutment portion 35a has a constricted shape, making it easier to deform the first connection portion 37. This further reduces the vibration transmitted to the operator, and further improves the operability of the sub-handle 20. The operability of the hammer drill 10 can also be further improved. In addition, since the bolt 27 and the nut 28 extend inside the support portion 35 over the entire axis D1 direction of the support portion 35, the second connection portion 35b and the third connection portion 35c are suppressed from being deformed. Therefore, when the load F1 is applied and the first connection portion 37 deforms, for example, the third connection portion 35c also deforms, which prevents the third connection portion 35c from being damaged by bending.

Next, another example of the sub-handle 20 of this embodiment will be described. The sub-handle 20 of the first embodiment shown in FIG. 8 has the bolt 27 and nut 28 arranged in the reverse order to those of the sub-handle 20 shown in FIG. 4. Specifically, the nut 28 engaged with the band 26 is arranged inside the mount member 21, while the bolt 27 is cast into the support portion 35 in the grip portion 36. The bolt 27 cast into the support portion 35 is arranged across the support portion 35 and the mount member 21, and the bolt 27 and the nut 28 are screwed together inside the mount member 21. Therefore, when the grip portion 36 is rotated in a predetermined direction around the axis D1, the screw connection presses the mount member 21 against the work machine body 1, and at the same time, the movement of the nut 28 pulls the band 26 so that it is in close contact with the work machine body 1, thereby fixing the sub-handle 20 to the work machine body 1. In the sub-handle 20 of the first embodiment, when vibrations occur in the work machine body 1, the first connection part 37 deforms, so the vibrations are less likely to be transmitted to the grip part 36. This reduces the vibrations transmitted to the worker, improving the operability of the sub-handle 20.

Next, in the sub-handle 20 of the second embodiment shown in FIG. 9, the grip portion 36 is composed of an inner grip portion 36c made of a first resin 36d and an outer grip portion 36e made of a second resin 36f having a lower hardness than the first resin 36d, and the outer grip portion 36e is formed over the outer periphery of the first connecting portion 37 and the third connecting portion 35c. That is, the second resin 36f of the outer grip portion 36e is filled in the outer periphery of the area between the grip portion 36 and the abutting portion 35a, and a resin portion that is integrated with the outer grip portion 36e is formed on the outer periphery. In other words, the second resin 36f of the outer grip portion 36e is filled in the outer periphery consisting of the end face 36b of the flange 36a, the outer periphery surface 37a of the first connecting portion 37, and the outer periphery surface 35h of the third connecting portion 35c, and a resin portion is formed. The second resin 36f is, for example, an elastomer.

This reduces the unevenness on the outer periphery of the handle member 34, and reduces adhesion of dust to the uneven parts. As a result, it is possible to suppress the hindrance of deformation of the first connection part 37. In addition, by forming a resin part made of elastomer on the outer periphery consisting of the end face 36b of the flange 36a, the outer periphery surface 37a of the first connection part 37, and the outer periphery surface 35h of the third connection part 35c, it is also possible to adjust the amount of deformation of the first connection part 37. Furthermore, the amount of deformation of the first connection part 37 can also be adjusted by changing the hardness of the elastomer.

Also, in the second embodiment, the vibration transmitted to the operator can be reduced by deforming the first connection portion 37, improving the workability of the sub-handle 20. The range in which the second resin 36f is filled may be extended to the position where it comes into contact with the mounting member 21.

Next, the sub-handle 20 of the third embodiment shown in FIG. 10 is provided with a restricting portion 45 that restricts the deformation of the first connection portion 37. Specifically, the provision of the restricting portion 45 makes it possible to adjust the amount of deformation of the first connection portion 37. In the sub-handle 20 shown in FIG. 10, the restricting portion 45 is a disk-shaped member and is attached to the end of the support portion 35 opposite the side where the abutting portion 35a is arranged, i.e., the second end 35f on the open end side of the support portion 35. The disk-shaped restricting portion 45 has multiple protrusions 45a, and these multiple protrusions 45a are fitted into the second end 35f of the support portion 35 to fix the restricting portion 45 to the support portion 35. However, the restricting portion 45 may be fixed to the support portion 35 by applying an adhesive or the like, or may be fixed by simply fitting the protrusions 45a without using an adhesive or the like.

The disc-shaped restricting portion 45 can adjust the amount of deformation of the first connecting portion 37 by adjusting the distance of the gap between the outer periphery of the restricting portion 45 and the inner gripping portion 36c (changing the size of the disc-shaped restricting portion 45). For example, by reducing the gap between the outer periphery of the restricting portion 45 and the inner gripping portion 36c, it is possible to reduce the amount of deformation of the first connecting portion 37, and by increasing the gap between the outer periphery of the restricting portion 45 and the inner gripping portion 36c, it is possible to increase the amount of deformation of the first connecting portion 37. Therefore, for example, by adjusting the size of the restricting portion 45 so that the amount of deformation of the first connecting portion 37 is not too large, it is possible to prevent a large load from being applied to the first connecting portion 37 and prevent cracks from being formed in the first connecting portion 37.

In addition, in the third embodiment, the deformation of the first connection portion 37 can reduce vibrations transmitted to the operator, improving the operability of the sub-handle 20.

Next, in the sub-handle 20 of the fourth embodiment shown in FIG. 11, the restricting portion 45 is attached to the mount member 21. Specifically, the restricting portion 45 is cylindrical, and the inner diameter of the restricting portion 45 is larger than the diameter of the abutting portion 35a of the support portion 35. In the region between the mount member 21 and the flange 36a, the cylindrical restricting portion 45 is attached to the end surface 21a of the mount member 21 so as not to come into contact with the support portion 35. In this structure, when the flange 36a moves due to the deformation of the first connection portion 37, the first connection portion 37 can be deformed until the flange 36a hits the restricting portion 45. In other words, the amount of deformation of the first connection portion 37 can be adjusted by changing the height of the cylindrical restricting portion 45.

In addition, in the fourth embodiment, the deformation of the first connection portion 37 can reduce vibrations transmitted to the operator, improving the operability of the sub-handle 20.

Next, the sub-handle 20 of the fifth embodiment shown in FIG. 12 has a structure that allows the operator to set the mounting position of the regulating part 45. For example, a through hole having a threaded part on the inner wall is formed in the center of the disk-shaped regulating part 45, and the regulating part 45 is screwed to the bolt 27 by passing the bolt 27 through the through hole. By screwing the regulating part 45 to the bolt 27, the operator can attach and detach the regulating part 45 as needed. In addition, since the regulating part 45 is screwed to the bolt 27, the regulating part 45 can be fixed at a desired position of the bolt 27. Here, the inner diameter of the inner grip part 36c of the grip part 36 of the handle member 34 gradually decreases from the open end side of the inner grip part 36c toward the flange 36a. Therefore, by setting the size of the disk-shaped restricting portion 45 so that it fits tightly into the inner grip portion 36c near the second end 35f of the support portion 35, it is possible to eliminate a gap between the outer periphery of the restricting portion 46 and the inner grip portion 36c by arranging the restricting portion 45 at the position of the restricting portion 46 on the bolt 27, and to forcibly eliminate deformation of the first connection portion 37. On the other hand, by arranging the restricting portion 45 at the position of the restricting portion 47 on the bolt 27, a gap is formed between the outer periphery of the restricting portion 47 and the inner grip portion 36c, and it is also possible to deform the first connection portion 37. That is, in the sub-handle 20 of the fifth embodiment, the operator can set the position of the restricting portion 45 to forcibly eliminate deformation of the first connection portion 37, or adjust the amount of deformation of the first connection portion 37. Note that, in the fifth embodiment, by setting the first connection portion 37 to deform, it is possible to reduce vibrations transmitted to the operator and improve the operability of the sub-handle 20.

Next, the sub-handle 20 of the sixth embodiment shown in FIG. 13 has a space 48 surrounded by the support portion 35, the grip portion 36, and the first connection portion 37 inside the cylindrical grip portion 36, and a third resin 49 is filled along the inner wall of this space 48 and the inner grip portion 36c to form a resin portion. The third resin 49 filled along the inner wall of the space 48 and the inner grip portion 36c is, for example, an elastomer. Furthermore, the restricting portion 45 is also formed of an elastomer at the second end 35f of the support portion 35. That is, the elastomer filled in the space 48 and the elastomer forming the restricting portion 45 are connected and formed as one piece, and the above elastomer is also connected and formed as one piece with the elastomer of the second resin 36f forming the outer grip portion 36e. The shape of the inner grip portion 36c of the sub-handle 20 shown in Fig. 13 is the shape shown in Fig. 14, and the cylindrical inner grip portion 36c has a plurality of small holes 36g formed along the circumferential direction U1. Therefore, by pouring elastomer from the outside to the inside of the inner grip portion 36c through the plurality of small holes 36g, the outer grip portion 36e, the resin portion of the space portion 48, the inner grip portion 36c and the resin portion inside the inner grip portion 36c, and the restricting portion 45 can be integrally formed with the same elastomer. Note that the grip portion 36 of the sub-handle 20 is cylindrical and has an open end on the opposite side to the mounting member 21, so that dust may enter from this open end and accumulate in the space portion 48. However, in the sub-handle 20 of the sixth embodiment, the space 48 in the grip 36 is filled with elastomer to form a resin portion, which prevents the deformation of the first connection part 37 from being hindered by dust accumulation in the space 48. In addition, by changing the hardness of the elastomer, it is possible to adjust the amount of deformation of the first connection part 37. In other words, by setting the first connection part 37 to deform in the sixth embodiment as well, it is possible to reduce vibrations transmitted to the operator and improve the operability of the sub-handle 20.

Next, in the sub-handle 20 of the seventh embodiment shown in FIG. 15, as shown in FIG. 16(b), the first connection parts 37 are provided intermittently in the circumferential direction U1 centered on the axis D1. Specifically, between adjacent first connection parts 37 of the multiple first connection parts 37 provided intermittently along the circumferential direction U1, a hole part 37b (see FIG. 16(b)) communicating with the space part 48 shown in FIG. 15 is provided, and the second resin 36f, which is the same as the second resin 36f of the outer grip part 36e, is poured into the space part 48 through this hole part 37b (see FIG. 16(a)). At that time, as shown in FIG. 15 and FIG. 16(c), the outer periphery of the abutment part 35a and the second connection part 35b is filled with the fourth resin 50, which is the same as the second resin 36f. The second resin 36f and the fourth resin 50 are the same elastomer.

In the sub-handle 20 of the seventh embodiment, the amount of deformation of the first connection portion 37 can be adjusted by changing the ratio of the multiple first connection portions 37 and the multiple hole portions 37b that are provided intermittently along the circumferential direction U1. In the seventh embodiment, the case where the hole portion 37b is filled with the second resin 36f (elastomer) as shown in FIG. 16(b) has been described, but the hole portion 37b does not have to be filled with the second resin 36f, and the hole portion 37b may be hollow. That is, even if the hole portion 37b is filled with the second resin 36f or the hole portion 37b is hollow, the first connection portion 37 can be deformed. Therefore, in the sub-handle 20 of the seventh embodiment, the deformation of the first connection portion 37 can reduce vibrations transmitted to the operator, and the workability of the sub-handle 20 can be improved.

The present invention is not limited to the above embodiment, and various modifications are possible without departing from the spirit of the present invention. In the above embodiment, a hammer drill 10 is taken as an example of a working machine, but the working machine may be, for example, an electric screwdriver, etc., as long as a sub-handle 20 can be attached to it.

1...Working machine body, 1a...Cylinder housing, 1b...Middle housing, 1c...Motor housing, 2...Main handle section, 3...Power cable, 4...Drive section (driving mechanism), 5...Trigger, 6...Trigger switch, 7...Tip tool holder, 8...Tip tool, 9...Piston, 10...Hammer drill (working machine), 17...Cylinder, 18...Reciprocating mechanism section, 19...Motor, 19a...Stator, 19b...Rotor, 19c...Output shaft, 19d...Fan, 19e...pinion gear, 20...sub-handle (handle), 20a...sub-handle outer peripheral surface (handle outer peripheral surface), 20b...smooth surface, 21...mounting member, 21a...end surface, 21b...rib, 21c...through hole, 22...striker, 23...air chamber, 24...second hammer, 25...retainer sleeve, 26...band, 27...bolt (fixing portion), 27b...head, 28...nut (fixing portion), 29...depth gauge mounting portion, 30...first drive shaft , 31... First gear, 32... Eccentric pin, 33... Connecting rod, 34... Handle member, 35... Support part, 35a... Contact part, 35b... Second connection part, 35c... Third connection part, 35d... Through hole, 35e... First end part, 35f... Second End, 35g... Fourth connection part, 35h... Outer peripheral surface, 35i... Most part, 36... Gripping part, 36a... Flange, 36b... End face, 36c... Inner grasping part, 36d... First resin, 36e... Outer grasping part, 36f... Second resin, 36g... Small hole, 37...first connection part, 37a...outer periphery, 37b...hole, 40...second drive shaft, 41...second gear, 42...bevel gear, 43...ring gear, 44...clutch, 45...regulating part, 45a...projection, 46, 47...regulating part, 48...space, 49...third resin, 50...fourth resin, C1, D1...axis, E1...impact direction, F1...load, L1, L2...diameter, P1...front-back direction, Q1...up-down direction, R1...left-right direction, T1...radial direction, U1...circumferential direction

Claims (14)

A mount member that abuts against a work machine body;
a handle member fixed to the mount member;
a fixing portion provided inside the mount member and the handle member, the fixing portion fixing the handle member to the mount member;
A handle having
the fixing portion extends inside the mount member and the handle member along an axial direction,
The handle member includes:
A support portion that supports the fixed portion;
a gripping portion that is disposed outside the support portion in a radial direction about the axis and is gripped by an operator;
a first connection portion located between the support portion and the grip portion in the radial direction and connecting the support portion and the grip portion,
the first connection portion has a length in the axial direction shorter than the support portion and the grip portion, and is disposed on one side of the handle member in the axial direction relative to the grip portion;
the support portion has a cylindrical abutment portion that abuts against the mount member in the axial direction, a second connection portion that is located on the other side of the abutment portion in the axial direction and connects to the first connection portion in the radial direction, and a cylindrical third connection portion that is located between the abutment portion and the second connection portion and connects the abutment portion and the second connection portion in the axial direction,
the third connection portion includes a portion whose radial size is smaller than that of the abutment portion,
The handle, wherein the grip portion is spaced apart from the mount member in a direction along the axial direction. The handle of claim 1, wherein the fixing portion is disposed inside the support portion so as to extend in the axial direction through the interiors of the abutment portion, the second connection portion, and the third connection portion, thereby suppressing deformation of the support portion in a direction intersecting the axis. The gripping portion includes an inner gripping portion made of a first resin and an outer gripping portion made of a second resin having a hardness lower than that of the first resin,
The handle according to claim 1 or 2 , wherein the outer grip portion is formed around an outer periphery of the first connecting portion and the third connecting portion. a restricting portion that restricts deformation of the first connection portion,
The handle according to claim 1 , wherein an amount of deformation of the first connection portion is adjustable by the restricting portion. The handle according to claim 4 , wherein the restriction portion is attached to an end portion of the support portion opposite to an end portion on which the abutment portion is disposed. The handle according to claim 4 or 5 , wherein the restriction portion is detachably attached to the support portion. The handle according to claim 4 , wherein the restriction portion is attached to the mounting member. 2. The handle according to claim 1, wherein an outer peripheral surface of the handle consisting of the end face of the grip portion facing the mount member, the outer peripheral surface of the first connection portion, and the outer peripheral surface of the third connection portion is a smooth surface consisting of flat surfaces and curved surfaces . a space portion surrounded by the support portion, the grip portion, and the first connection portion;
The handle according to claim 1 , wherein the space is filled with a resin. The handle according to claim 1 , wherein the first connection portion is provided discontinuously in a circumferential direction about the axis. The handle according to claim 1 , wherein the support portion, the grip portion and the first connection portion are integral. A work machine body,
A tool tip attached to the work machine body and extending along an axis;
A drive mechanism that drives the tool bit;
A handle attached to the work machine body and held by an operator;
A work machine having
The handle is
A mount member that abuts against the work machine body;
a handle member fixed to the mount member;
a fixing portion provided inside the mount member and the handle member, the fixing portion fixing the handle member to the mount member,
the fixing portion extends inside the mount member and the handle member along an axial direction,
The handle member includes:
A support portion that supports the fixed portion;
A gripping portion disposed outside the support portion in a radial direction about the axis;
a first connection portion located between the support portion and the grip portion in the radial direction and connecting the support portion and the grip portion,
the first connection portion has a length in the axial direction shorter than the support portion and the grip portion, and is disposed on one side of the handle member in the axial direction relative to the grip portion;
the support portion has a cylindrical abutment portion that abuts against the mount member in the axial direction, a second connection portion that is located on the other side of the abutment portion in the axial direction and connects to the first connection portion in the radial direction, and a cylindrical third connection portion that is located between the abutment portion and the second connection portion and connects the abutment portion and the second connection portion in the axial direction,
the third connection portion includes a portion whose radial size is smaller than that of the abutment portion,
The grip portion is spaced apart from the mount member in a direction along the axial direction. A mount member that abuts against a work machine body;
a handle member fixed to the mount member;
a fixing portion provided inside the mount member and the handle member, the fixing portion fixing the handle member to the mount member;
A handle having
the fixing portion extends inside the mount member and the handle member along an axial direction,
The handle member includes:
A support portion that supports the fixed portion;
a gripping portion that is disposed outside the support portion in a radial direction about the axis and is gripped by an operator;
a connecting portion located between the support portion and the grip portion in the radial direction and connecting the support portion and the grip portion,
the mount member is disposed on one side of the grip portion of the handle member in the axial direction,
the connection portion has a length in the axial direction shorter than the support portion and the grip portion, and is disposed on one side of the handle member in the axial direction relative to the grip portion,
the support portion has an open end portion extending toward the other side in the axial direction relative to the connection portion,
The handle member has a space between the gripping portion and the open end in the radial direction. A work machine comprising the handle according to claim 13.

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