JP2010215117A - Cargo handling apparatus for vehicle - Google Patents

Abstract

An object of the present invention is to provide a vehicle loading / unloading device that assists in a closing operation of a loading platform while effectively using a space behind the loading platform.
A base end of a loading platform is supported so as to be rotatable about a third connecting shaft (open / close rotation shaft) provided in a parallel link mechanism, and a lift cylinder is supported by the parallel link mechanism. The loading platform 1 is moved up and down by the power of. An urging mechanism 24 for assisting a closing operation for rotating the loading platform 1 around the third connecting shaft 7 from a horizontal posture to a vertical posture is provided, and the urging mechanism 24 is rotated to the horizontal posture. The power is stored when moving, and the stored force is used to assist the closing operation.
[Selection] Figure 1

Description

  The present invention relates to a vehicle loading / unloading device that lifts and lowers a loading platform in a horizontal posture between a ground surface and a floor height of a cargo box when in use.

  Conventionally, this type of vehicle loading / unloading device has a parallel link mechanism that lifts and lowers the loading platform by the power of a lift cylinder, and the loading platform base end has an opening / closing rotation shaft provided in the parallel link mechanism. It is rotatably supported at the center. This loading platform has a relatively large mass, and it is particularly necessary to apply a large force to manually lift the platform from a horizontal position to a vertical position.

  Therefore, in Patent Document 1, for example, a hollow reinforcing material extending in the vertical direction (front-rear direction) is provided on the back side of the loading platform, and a balance spring or an opening / closing hydraulic cylinder is provided inside the reinforcing material. The balance spring or the opening / closing hydraulic cylinder assists the closing operation of the loading platform.

Japanese Utility Model Publication 5-33395

  However, in the vehicle loading device of Patent Document 1, a mechanism for assisting the opening / closing operation is provided on the back surface of the loading platform, so it is not flat, and a large space for decoration such as letters and pictures is provided in the space between the reinforcing members. Even if it is applied or a rear reflector is applied, it cannot be seen from behind obliquely behind the large protruding reinforcing material, and there is a problem that a large space cannot be used effectively.

  The present invention has been made in view of such points, and an object of the present invention is to make it possible to assist the closing operation of the loading platform while effectively using the space behind the loading platform. It is in.

  In order to achieve the above object, according to the present invention, a mechanism for assisting the closing operation of the loading platform is provided not on the loading platform side but on the parallel link mechanism side.

  Specifically, the first aspect of the present invention is directed to a vehicle loading / unloading device that lifts and lowers a loading platform in a horizontal posture between the ground surface and the floor height of the packing box when in use.

The loading platform base end is supported so as to be rotatable around an opening / closing rotation shaft provided in a parallel link mechanism that performs the lifting / lowering operation of the loading platform by the power of a lift cylinder,
The parallel link mechanism is provided with an urging mechanism for assisting a closing operation for rotating the loading platform from the horizontal posture to the vertical posture around the opening / closing rotation shaft,
The urging mechanism is configured to store a force when the loading platform is rotated to the horizontal posture and assist the closing operation using the stored force.

  According to the above configuration, the urging mechanism provided in the parallel link mechanism stores a force when opening the loading platform, and uses the force to perform a closing operation to rotate the loading platform from a horizontal posture to a vertical posture. Because it assists, the loading platform can be easily closed manually. Moreover, since the urging mechanism is provided on the parallel link mechanism side, it is not necessary to provide the urging mechanism on the back surface of the loading platform, and the rear reflector can be provided by the urging mechanism even if a rear reflector or a decoration is applied. It will not be impossible to see from behind diagonally.

In the second invention, in the first invention,
The biasing mechanism is
Telescopic guide rod,
A compression coil spring fitted on the outer periphery of the telescopic guide rod,
One end of the guide rod is rotatably connected to the parallel link mechanism, and the other end is rotatably connected to a position away from the opening / closing rotation shaft of the loading platform base end.

  According to the above configuration, as the length of the guide rod is reduced when the loading platform is opened, the compression coil spring is compressed to store the force, and the repulsive force is used to close the loading platform. Since the closing operation is assisted, it is not necessary to provide an urging mechanism on the back side of the loading platform as in the prior art.

In the third invention, in the first or second invention,
The back side of the loading platform is formed substantially flat, and a rear reflector is attached to the flat surface.

  According to said structure, a rear reflector can be affixed on the wide range of a loading platform, and a rear reflector can be looked at from the back wide range.

  As described above, according to the present invention, by providing the urging mechanism for assisting the closing operation of the loading platform on the parallel link mechanism side, a wide space on the back surface of the loading platform can be used effectively, The opening / closing operation can be performed very easily by assisting the closing operation of the loading platform.

  According to the second aspect of the invention, the extendable guide rod is rotatably connected to the parallel link mechanism and a position apart from the opening / closing rotation shaft of the loading platform base end, and the compression coil spring is fitted on the outer periphery thereof. As a result, the closing operation of the loading platform can be assisted with a simple configuration.

  According to the third aspect of the invention, by forming the back side of the loading platform substantially flat and attaching the rear reflector, the vehicle is provided with a large rear reflector with a good view from the rear. High safety can be ensured.

It is the II sectional view taken on the line of FIG. 6 which shows the state which stored the loading platform of the vehicle loading / unloading apparatus concerning embodiment of this invention with the vertical attitude | position. FIG. 2 is a view corresponding to FIG. 1 showing a state in which the loading platform of the vehicle loading device is in a horizontal posture and at the floor level of the cargo box. FIG. 2 is a view corresponding to FIG. 1 showing a state in which the loading platform of the vehicle loading device is tilted at the floor height of the cargo box and the cargo box is bridged to the delivery place. FIG. 2 is a view corresponding to FIG. 1 illustrating a state in which a loading platform of the vehicle loading device is in contact with the ground in a horizontal posture. FIG. 2 is a view corresponding to FIG. 1 showing a state in which the tip of the loading platform of the vehicle loading device is tilted and grounded to the ground. It is a rear view which shows the state which stored the loading platform of the cargo handling apparatus for vehicles with the vertical attitude | position. It is the schematic perspective view which looked at the whole vehicle which shows the state which inclined the loading platform front-end | tip of the vehicle loading / unloading apparatus, and was earth | grounded on the ground. FIG. 7 is an enlarged view of the urging mechanism of FIG. 6 and its surroundings. It is an enlarged side view of an urging mechanism. FIG. 2 is an enlarged cross-sectional view of the tilt stopper and its periphery in FIG. 1. FIG. 3 is an enlarged cross-sectional view of the tilt stopper and its periphery in FIG. 2.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 to 6 show a vehicle loading apparatus A according to an embodiment of the present invention. In this embodiment, as shown in FIG. 7, the vehicle handling device A is mounted below the cargo box B at the rear end of a vehicle such as a van vehicle in which the cargo box B is mounted on the vehicle body D. The present invention can also be applied to the case where it is installed below the packing box B on the side end of D. The vehicle loading apparatus A includes a substantially rectangular plate-like loading platform 1 that lifts and lowers a load, and two sets of parallel link mechanisms 2 that cantilever-support the loading platform 1 on both sides to support each other. The loading platform is provided by the synchronous operation of the two sets of parallel link mechanisms 2, the manual opening and closing of the load box B at the height of the floor surface b1, and the biasing assist of the compression coil spring 19 described later. 1 is stored in the vertical position shown in FIGS. 1 and 6, in the horizontal position shown in FIG. 2 is at the height of the floor surface b1 of the packing box B, and tilted at the height of the floor surface b1 of the packing box B in FIG. Then, the posture is changed to a state in which the packing box B is bridged to the delivery place E, a state in which it is in contact with the ground G in the horizontal posture of FIG. 4, and a state in which the tip of FIG. ing.

  1 to 7, b <b> 1 is a floor surface of the packing box B, and an opening b <b> 2 having the same size as the loading platform 1 is opened above the floor surface b <b> 1 at the rear end of the packing box B. In addition, the door of a double door and the up-and-down sliding type shutter (both not shown) may be provided in the rear end of the packing box B so that opening and closing is possible. C is a support frame having a closed cross-sectional shape extending in the vehicle width direction constituting the vehicle body fixing side, and this support frame C is attached to a chassis frame c1 extending in the front-rear direction of the vehicle body D on both sides in the vehicle width direction via fixed brackets c2. Are fixed. A first support bracket D1 and a second support bracket D2 are disposed on the side of the fixed frame c2 of the support frame C. A bumper c3 is attached to the support frame C.

  On the other hand, both the parallel link mechanisms 2 are provided with a vertically long tilt arm 4 whose upper end is pivotally attached to the first support bracket D1 by the first connecting shaft 3 so as to be rotatable in the vertical direction. Near the upper end of the tilt arm 4, the base end of the lift arm 5 is pivotally mounted on the second connecting shaft 6 so as to be pivotable in the vertical direction. The tip of the lift arm 5 is opened and closed with the link arm 14 at the base end of the loading platform 1. A third connecting shaft 7 serving as a rotating shaft is pivotally mounted so as to be rotatable in the vertical direction. A lift cylinder 8 made of a hydraulic cylinder is disposed below the lift arm 5, and the tip of the piston rod 8 a of the lift cylinder 8 is pivoted to the lower end of the tilt arm 4 so as to be rotatable in the vertical direction by the fourth connecting shaft 9. The base end of the cylinder tube 8b is pivotally attached to the lift arm 5 so as to be rotatable in the vertical direction by the fifth connecting shaft 10. The distal end of the compression arm 11 is pivotally attached to the link arm 14 so as to be pivotable in the vertical direction by the sixth connecting shaft 12. The base end of the compression arm 11 is vertically moved by the seventh connecting shaft 13 to the second support bracket D 2. It is pivotally attached to the direction. As shown in FIG. 8, a flat contacted portion 14 a that extends to the left and right is formed in the lower portion of the link arm 14.

  The tilt arm 4, lift arm 5, lift cylinder 8, compression arm 11, and link arm 14 constitute a parallel link mechanism 2, and both lift cylinders 8 of the two sets of parallel link mechanisms 2 are operated by synchronized expansion and contraction operations. The loading platform 1 is moved up and down between the ground G and the height of the floor surface b1 of the packing box B in a horizontal posture (see FIGS. 2 and 4).

  As a feature of the present embodiment, the parallel link mechanism 2 is provided with an urging mechanism 24 that assists a closing operation for rotating the loading platform 1 from the horizontal posture to the vertical posture around the third connecting shaft 7. Yes. Specifically, as shown in FIG. 1, the gate bracket 15 bulges on the rear side in the vertical posture on the base end side of the loading platform 1 (the lower surface side in the horizontal posture shown in FIG. 2). Is fixed. A first rod rotation shaft 17 that rotatably supports the tip of the guide rod 16 is inserted behind the third connecting shaft 7 in the gate bracket 15. On the other hand, the proximal end side of the guide rod 16 is supported by the second rod rotating shaft 18 slightly ahead of the proximal end of the compression arm 11. As shown in FIGS. 8 and 9 in an enlarged manner, the guide rod 16 is configured to be extendable by inserting a shaft portion 16b into the outer cylinder 16a. An annular first flange 16c is fixed to the outer cylinder 16a at a predetermined position. The shaft portion 16b is processed with a male screw, and a distance between the second rod rotating shaft 18 can be changed by a positioning nut 16e in which an annular second flange portion 16d inserted into the male screw is screwed into the male screw. It is configured. A compression coil spring 19 is fitted between the first flange portion 16c and the second flange portion 16d. As a result, the compression coil spring 19 expands and contracts as the guide rod 16 expands and contracts. The urging mechanism 24 is constituted by the guide rod 16 and the compression coil spring 19.

  Furthermore, as shown in FIGS. 8, 10 and 11, a pair of tilt stoppers 20 are rotatably provided above the first rod rotation shaft 17 in the left and right gate brackets 15, respectively. As shown in FIGS. 2 and 11, the tilt stopper 20 is brought into contact with the lower end of the link arm 14 in the horizontal posture of the loading platform 1 when locked on the surface of the loading platform 1. It is comprised so that it may contact | abut to the part 14a and a horizontal posture may be maintained. On the other hand, as shown in FIG. 3, in the unlocked state substantially perpendicular to the surface of the loading platform 1, the loading platform until the gate bracket 15 abuts against the abutted portion 14 a of the link arm 14 instead of the tilt stopper 20. 1 is fully open. As shown also in FIG. 8, the pair of left and right tilt stoppers 20 are connected to a pivot shaft 22 extending to the left and right and to a tilt stopper operation lever 21. The left and right tilt stopper operating levers 21 are connected to each other by a horizontal connecting rod 23. For this reason, when the tilt stopper operating lever 21 is rotated as shown by the arrow in FIG. 10 via the horizontal connecting rod 23, the left and right tilt stoppers 20 are configured to rotate in conjunction with each other.

  Further, when the loading platform 1 is grounded in a horizontal posture, both the tilt arms 4 of the two sets of parallel link mechanisms 2 are loaded by the weight of the loading platform 1 or as shown in FIG. Together with the total load to which the load is added, both are rotated around the first connecting shaft 3 in the direction away from the support frame C, and the tip of the loading platform 1 is tilted forward and lowered to be grounded to the ground G. (See FIG. 5). That is, when both the tilt arms 4 are rotated in the direction away from the support frame C, both the lift arms 5 are moved by the rotation so as to be pushed out to the front end side of the loading platform 1, and as a result, the loading platform 1 is It rotates around the sixth connecting shaft 12 and is grounded in a forward inclined posture. The loading platform 1 vertically moves up and down between the ground G and the height of the floor surface b1 of the packing box B by the expansion and contraction operation of the lift cylinder 8 (see FIGS. 2 and 4). The posture is changed (opened / closed) between the horizontal posture and the vertical posture around the third connecting shaft 7 by the expansion / contraction operation and the biasing assist of the compression coil spring 19 accompanying the manual opening and closing in the state of being at a height (FIG. 1). And FIG. 2).

  And as shown in FIG. 6, since the loading platform 1 of this embodiment is flat on the back side, a pair of large rear reflectors 25 extending left and right are attached directly above the parallel link mechanism 2. Yes.

  Next, the operation of the vehicle handling apparatus A configured as described above will be described.

  (1) FIG. 1 shows a state in which the loading platform 1 is stored in a vertical posture. In this retracted state, the lift cylinders 8 of the two sets of parallel link mechanisms 2 are extended, and the lift arm 5, the lift cylinder 8 and the compression arm 11 are rotated upward and tilted upward toward the rear of the vehicle body D. Holds posture. The compression coil spring 19 is in an extended state (natural length or slightly compressed length).

  (2) In order to shift the loading platform 1 from the retracted state to the horizontal posture, first, as shown in FIG. 10, the tilt stopper operating lever 21 is tilted forward so that the tilt stopper 20 is brought into contact with the surface of the loading platform 1. Keep the lock almost horizontal. Then, the loading platform 1 is manually rotated while being pulled downward. Thereby, while the compression coil spring 19 is contracted, the loading platform 1 rotates downward around the third connecting shaft 7 and the tilt stopper 20 contacts the contacted portion 14a of the link arm 14 of the parallel link mechanism 2. The loading platform 1 assumes a horizontal posture at the height of the floor surface b1 of the packing box B as shown in FIG. In this state, for example, a load is loaded from the load box B onto the loading platform 1. Elastic energy is stored in the reduced compression coil spring 19.

  (3) When loading / unloading cargo with the ground G, the hydraulic pressure is discharged from the non-rod side working chamber of the lift cylinder 8. As a result, the lift cylinder 8 contracts and the lift arm 5, the lift cylinder 8 and the compression arm 11 rotate downward, and the loading platform 1 descends in a horizontal posture from the height of the floor surface b1 of the cargo box B. First, as shown in FIG. 4, the base end of the loading platform 1 contacts the ground G.

  (4) When the loading platform 1 comes in contact with the ground G, the tilt arm 4 moves away from the support frame C by the weight of the loading platform 1 or the total load obtained by adding the load of the load to the loading platform 1 (white in FIG. 4). It rotates around the first connecting shaft 3 in the direction indicated by the extraction arrow. When the tilt arm 4 rotates in a direction away from the support frame C, the lift arm 5 moves so as to be pushed out toward the tip end side of the loading platform 1 and the parallel state of the two sets of parallel link mechanisms 2 breaks down. As shown in FIG. 5, 1 rotates around the sixth connecting shaft 12 and is grounded in a forward inclined posture. Load and unload luggage with this forward leaning posture.

  (5) When returning the loading platform 1 to the retracted state of the vertical posture, hydraulic pressure is supplied to the non-rod side working chamber of the lift cylinder 8. As a result, the lift cylinder 8 extends and the loading platform 1 rotates around the sixth connecting shaft 12 to return to the horizontal posture shown in FIG. 4. Subsequently, the lift arm 5, lift cylinder 8, and compression arm 11 are moved. And the loading platform 1 rises in a horizontal posture to the height of the floor surface b1 of the packing box B as shown in FIG. Thereafter, while being assisted by the repulsive force of the compression coil spring 19 that has been compressed, the loading platform 1 is manually rotated upward around the third connecting shaft 7 to the vertical posture of FIG. Put it in a state. At this time, since the compression coil spring 19 is assisted, the loading platform 1 can be closed with a small force.

  And as shown in FIG. 6, since the loading platform 1 of this embodiment is flat on the back side, even if the large rear reflector 25 is attached, it can be seen from a wide range behind the vehicle. In addition, it is possible to greatly decorate the company name and the like.

  In addition, when the delivery platform E and the cargo box B are bridged between the ground G and the height of the floor surface b1 of the cargo box B on the loading platform 1, the tilt stopper 20 is unlocked in the step (2). Leave it in a state. In this state, the loading platform 1 is manually rotated while being pulled downward. Then, the loading platform 1 is fully opened until the gate bracket 15 contacts the contacted portion 14a of the link arm 14. As a result, the loading platform 1 tilts forward by a predetermined angle, the leading end side of the loading platform 1 rests on the delivery place E, and the packing box B and the delivery place E are bridged by the loading platform 1 (see FIG. 3). .

(Other embodiments)
The present invention may be configured as follows with respect to the above embodiment.

  That is, in the above embodiment, the posture change of the loading platform 1 from the horizontal posture to the vertical posture is assisted by the compression coil spring 19, but an urging means such as an air cylinder or a hydraulic cylinder is used instead of the compression coil spring 19. It may be used to assist the posture change with the urging force.

  In addition, the above embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or a use.

A Vehicle handling device B Cargo box b1 Floor 1 Loading platform 2 Parallel link mechanism 7 Third connecting shaft (opening / closing rotating shaft)
8 Lift cylinder 16 Guide rod 19 Compression coil spring 24 Biasing mechanism

Claims (3)

A vehicle loading / unloading device that lifts and lowers the loading platform in a horizontal position between the ground and the floor height of the packing box when in use,
The loading platform base end is supported so as to be rotatable around an opening / closing rotation shaft provided in a parallel link mechanism that moves up and down the loading platform by the power of a lift cylinder,
The parallel link mechanism is provided with an urging mechanism for assisting a closing operation for rotating the loading platform from the horizontal posture to the vertical posture around the opening / closing rotation shaft,
The urging mechanism is configured to store force when the loading platform is rotated to the horizontal posture, and to assist the closing operation using the stored force. Cargo handling equipment. The vehicle loading / unloading apparatus according to claim 1,
The biasing mechanism is
Telescopic guide rod,
A compression coil spring fitted on the outer periphery of the telescopic guide rod,
One end of the guide rod is rotatably connected to the parallel link mechanism, and the other end is rotatably connected to a position away from the opening / closing rotation shaft of the loading platform base end. A vehicle loading / unloading device. In the vehicle loading and unloading apparatus according to claim 1 or 2,
The vehicle loading / unloading apparatus according to claim 1, wherein a rear side of the loading platform is formed substantially flat, and a rear reflector is attached to the flat surface.

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