JP4197223B2 - Positioning device for loading platform in lifting platform lifting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a load receiving table lifting device for moving a load receiving table up and down via a link mechanism, and more particularly to a load receiving table positioning device that positions a load receiving table that is folded and stored below a floor surface of a loading table at a storage height position. It is.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a load receiving platform lifting device, a load receiving platform is provided so as to be movable up and down via a link mechanism having two upper and lower upper links and a lower link, and the load receiving platform is folded back and forth. Those configured to be slidable and stored in a storage position below the floor surface are known. The load receiving platform lifting device is supported by rails extending in the front-rear direction on the lower surface of the load receiving platform. The load receiving stand is stored at the foremost end of the rail, and is slid to the rear end of the loading platform and pulled to the end of the rail. Expanded from the folded state to the working state and converted into an unfolded / folded position for folding from this working state, and an ascending / descending work position for moving up and down in the middle of the rail that has been slid a predetermined amount from the unfolded / folded position It is made to be done. And when storing the load receiving table, the working state is such that the load receiving table is grounded downward by the link mechanism at the rearmost end of the rail that has been slid backward by a predetermined amount from the lifting position in the middle of the rail. The folded load receiving base is raised by a link mechanism and stopped at the storage height position, and in this state, the load receiving base is slid forward and stored in the storage position.
[0003]
In addition, some are provided with a positioning device or the like for positioning the load receiving table at the retracted height position at the unfolded / folded position. This positioning device is provided with an electrical position detection sensor for detecting the height position of the storage position of the load receiving table. When it is detected that the load receiving table has been raised to the storage height position at the unfolded / folded position, The raising operation of the table is stopped, and the cargo receiving table is positioned at the storage height position.
[0004]
[Problems to be solved by the invention]
However, in the positioning device as described above, the detection position of the load receiving platform may vary due to poor adjustment of the mounting position of the position detection sensor or unevenness of the road surface. In this state, the load receiving platform is moved forward along the rail. When the slide is moved, the load receiving platform interferes with the floor of the loading platform, the rear wheel suspension system, and the like. For this reason, it has been eagerly desired to stop the cargo receiving platform accurately at the storage height position.
[0005]
The present invention has been made in view of the above points, and an object of the present invention is to provide a positioning device for a load receiving base capable of accurately stopping the load receiving base at the storage height position in the load receiving base lifting device. It is in.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the solution according to the first aspect of the present invention is to provide a load receiving platform that can be moved up and down via a link mechanism having two upper and lower upper links and a lower link. In a state where the platform is folded back and forth, the platform is slid and stored in the storage position below the loading platform. Further, the load receiving platform is expanded from the folded state in the state of being slid and pulled out to the rear of the loading platform, the unfolded / folded position for folding from the working state, and the forward from the unfolded / folded position. It is configured to be mutually convertible to a lifting / lowering position where the fixed amount slide is performed to lift and lower the load receiving table. And a storage height positioning means for positioning the load receiving base by bringing the load receiving base into contact with the storage position at a storage height position slidable when the load receiving base is folded by the link mechanism when the load receiving base is stored. It is set as the structure to provide.
[0007]
Due to this specific matter, the load receiving base folded from the working state in the state where it is grounded downward in the unfolded / folded position when retracting the load receiving base can be slid to the retracted position below the loading base when lifted by the link mechanism. By abutting at the storage height position, further upward movement is restricted, and positioning at the storage height position by the storage height positioning means is mechanically performed. For this reason, unlike the case where the storage height position is detected by an electrical position detection sensor, there is no variation in the detection position of the load receiving platform due to poor adjustment of the sensor mounting position or unevenness of the road surface. As a result, even if the cargo cradle is slid forward along the rail, the cargo cradle does not interfere with the floor of the cargo bed, the rear wheel suspension, etc., and the cargo cradle is accurately stopped at the storage height position. It becomes possible to make it.
[0008]
In particular, the following configuration is cited as a means for accurately positioning the load receiving platform at the lifting / lowering operation position.
[0009]
In other words, there is provided lifting work positioning means for positioning the load receiving base developed in the working state by sliding it a predetermined amount from the unfolding / folding position to the front in contact with the load receiving base.
[0010]
Due to this specific matter, the load receiving platform deployed in the working state at the unfolded / folded position of the rear end of the rail is restricted from sliding further forward by abutting at the lifting / lowering working position when it is slid forward by a predetermined amount. Thus, positioning at the lifting work position by the lifting work positioning means is mechanically performed. As a result, it is possible to accurately stop the load receiving table that slides forward along the rail from the unfolded / folded position of the rear end of the rail at the lifting / lowering position in the middle of the rail.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0012]
1-6 has shown schematic structure of the load receiving device raising / lowering apparatus provided with the positioning device of the load receiving stand which concerns on this invention.
[0013]
In FIG. 1 to FIG. 6, reference numeral 1 denotes a loading platform mounted on a vehicle frame of a vehicle. A loading platform lifting device 2 is provided below the rear end of the loading platform 1.
[0014]
The load receiving platform lifting device 2 includes an attachment member 3 provided on the vehicle frame 11 and a load receiving stand 5 provided on the attachment member 3 via a link mechanism 4.
[0015]
The attachment member 3 is provided to be slidable in the front-rear direction along a substantially outward U-shaped slide rail 12 extending in the front-rear direction at the rear end of the vehicle frame 11. Specifically, a pair of front and rear rollers 31, 31 provided above the mounting member 3 are supported so as to be able to roll within the slide rail 12, and the mounting member 3 is manually or appropriately moved by the slide rail 12. The entire load receiving platform lifting / lowering device 2 is configured to be movable back and forth under the floor surface of the loading platform 1.
[0016]
As an example of the moving means, although not shown, a rack is provided on the lower surface of the slide rail 12 across the front and rear ends of the slide rail 12, and a pinion gear that meshes with the rack is provided on the mounting member 3. The attachment member 3 is moved back and forth along the slide rail 12 by rotating the pinion gear in the forward and reverse directions via an appropriate transmission mechanism by the handle. In addition to the above configuration, the moving means may be a combination of a chain and a drive sprocket, or may move the mounting member 3 back and forth using an actuator such as a motor or a cylinder.
[0017]
A driving shaft 6 extending substantially horizontally in the vehicle width direction is rotatably supported by the mounting member 3. A base end portion of a drive arm 61 is connected to the drive shaft 6 in an integrated manner. The distal end portion of the drive arm 61 is rotatably connected to the distal end of a telescopic rod of a telescopic cylinder (not shown) provided on the attachment member 3.
[0018]
Further, the upper end position of the front end of the rotation bracket 63 is connected to the drive shaft 6 so as to rotate together, and a base end portion of a lift link 41 (to be described later) is pivotally supported in the middle of the rotation bracket 63. .
[0019]
The link mechanism 4 includes a lift link 41 as a lower link and a connecting link 42 as an upper link.
[0020]
The lift link 41 has a base end portion pivotally supported at a substantially central portion of the rotation bracket 63 via a pivot 41a. A contact bolt 64 for contacting the lower surface of the lift link 41 near the base end portion is provided at the lower position of the rear end of the rotating bracket 63. The abutting bolt 64 abuts against a portion near the base end portion of the lift link 41 from below, so that the expansion and contraction operation of the lift cylinder is performed by the rotation of the rotating bracket 63 via the drive arm 61 and the drive shaft 6. The movement can be transmitted to the lift link 41 as a moving operation, whereby the lift link 41 is rotated up and down.
[0021]
On the other hand, the base end portion of the connecting link 42 is pivotally supported by the mounting member 3 via a pivot shaft 42a.
[0022]
The members such as the slide rail 12, the mounting member 3, the link mechanism 4, and the drive shaft 6 described above are provided in pairs on the left and right sides of the vehicle frame 11, and the left and right mounting members 3 are arranged in the slide rail 12. The connecting members 3a are connected so as to slide in synchronization with each other.
[0023]
The load receiving platform 5 includes a distal end side member 51 on the distal end side, a proximal end side member 52 on the proximal end side, and a pair of left and right central hinges that rotatably supports the distal end side member 51 and the proximal end side member 52. 53 (only one is shown in the figure), and the distal end side member 51 is folded on the upper surface of the proximal end side member 52 so as to be folded in half.
[0024]
The base end side of the base end side member 52 is rotatably connected to the link mechanism distal end side bracket 54 via a pair of left and right base end side hinges 50 (only one is shown in the figure). The front end side member 51 and the base end side member 52 folded in half are folded above the link mechanism front end side bracket 54 and the link mechanism 4 (the lift link 41 and the connecting link 42) by the base end side hinge 50. It is made to be mounted. At the upper positions on both the left and right sides of the link mechanism front end side bracket 54, the front ends of the left and right connecting links 42 are pivotally supported via pivots 42b, respectively, while the link mechanism front end side bracket 54 is positioned at the lower positions on both the left and right sides. The left and right lift links 41 are pivotally supported at the tip portions thereof via pivots 41b. In this case, the proximal-side hinge 50 stands up when the folded-up distal end member 51 and proximal end member 52 are folded and placed above the link mechanism distal end side bracket 54 and the link mechanism 4. (The state shown in FIGS. 2, 5, and 6), while the load receiving platform 5 (the distal end side member 51 and the proximal end side member 52) is deployed behind the link mechanism 4, the distal end side of the link mechanism The bracket 54 and the base end side member 52 are converted into a lying state (the state shown in FIGS. 3 and 4) so as to be substantially flush with the upper surface of the bracket 54 and the base end side member 52.
[0025]
Then, the work of folding and placing the front end side member 51 and the base end side member 52 folded above the link mechanism 4 is the same as the work of unfolding from the folded state to the working state. This is performed at the unfolding / folding position (the position shown in FIGS. 3 and 5) where the entire load receiving platform lifting device 2 (load receiving stand 5) is slid rearward of the loading platform 1 and pulled out to the end of the slide rail 12. Further, the lifting operation of the load receiving platform 5 unfolded at the unfolding / folding position is performed at the lifting / lowering position (position shown in FIG. 4) in the middle of the slide rail 12 slid forward by a predetermined amount from the unfolding / folding position. . Further, the load receiving platform 5 folded at the unfolded / folded position is stored in the storage position (the position shown in FIG. 2) by sliding it forward of the load platform 1 and pushing it to the foremost end of the slide rail 12. That is, the load receiving platform 5 is configured to be able to be converted into an unfolded / folded position at the rear end of the slide rail 12, an elevating work position at the middle position of the slide rail 12, and a retracted position at the front end of the slide rail 12. Yes.
[0026]
Further, the tip of the front end side member 51 is formed in a wedge shape, and the load receiving base 5 is configured to be tiltable so that the tip of the load receiving base 5 contacts the ground without a step when the load receiving base 5 reaches the ground.
[0027]
The load receiving platform lifting / lowering device 2 is provided with a positioning device 7 for positioning the load receiving stand 5. The positioning device 7 includes a storage height positioning means 8 that positions the load receiving platform 5 at a storage height position that is slidable with respect to the storage position of the foremost end of the slide rail 12 when the load receiving platform 5 is stored, and a deployed / folded position. Elevating work positioning means 9 for positioning the load receiving platform 5 deployed in the working state at the lifting work position is provided.
[0028]
The storage height positioning means 8 is provided on the mounting member 3 and includes a stopper mechanism 81 including a stopper piece 81a that can be moved forward and backward on a rotation trajectory from the lower side to the upper side of the rotation bracket 63, and the rotation bracket 63. When the load receiving platform 5 is lifted while being grounded at the unfolded / folded position, the rotation of the rotating bracket 63 is restricted by the contact with the stopper mechanism 81 and the load receiving platform 5 is restricted. And an abutment piece 82 for positioning at the storage height position.
[0029]
The stopper mechanism 81 includes a rotation shaft 81b that is rotatably supported at a substantially central portion of the mounting member 3 (directly above the connecting member 3a) and protrudes outward in the vehicle width direction, and a middle portion of the rotation shaft 81b. A first bracket 81c whose base end is rotatably supported (outside the mounting member 3), a second bracket 81d whose base end is fixed to the rear end upper position of the mounting member 3, and the second bracket A substantially L-shaped stopper piece 81a having a bent portion pivotally supported at the tip of 81d, and both ends of the stopper piece 81a at the base end side and the tip of the first bracket 81c are turnable. A supported first link 81e, a roller bracket 81g having a base end rotatably connected to an inner end of the rotating shaft 81b and having a roller 81f that is rotatable at the tip, and the rotating shaft 81b A third bracket connected to the outer end of the rotary unit integrally. 81 h, the first bracket 81 c is linked between the first bracket 81 c and the mounting member 3, and the first bracket 81 c is moved so as to advance the stopper piece 81 a on the rotation locus of the rotation bracket 63 via the first link 81 e. Both ends are fixedly attached to a biasing spring 81i that biases in a predetermined direction (clockwise in FIGS. 2 to 6), the first bracket 81c, and the third bracket 81h, and the rotation between the brackets 81c and 81h. When the rotating shaft 81b is rotated (counterclockwise in FIGS. 2 to 6) so as to be wound on the moving shaft 81b and retract the stopper piece 81a from the rotating locus of the rotating bracket 63 A winding spring 81j that rotates the first bracket 81c counterclockwise (counterclockwise in FIGS. 2 to 6) against the urging force of the urging spring 81i is provided.
[0030]
That is, the storage height positioning means 8 causes the stopper piece 81a to advance on the rotation locus of the rotation bracket 63 via the first bracket 81c and the first link 81e by the urging force of the urging spring 81i. The tip of the stopper piece 81a is brought into contact with the contact piece 82 of the rotation bracket 63 to restrict the rotation of the rotation bracket 63 further upward, and thus the load receiving platform 5 folded at the unfolded / folded position is provided. It is designed to be positioned at the storage height position.
[0031]
On the other hand, the lifting operation positioning means 9 is provided on the load receiving platform 5 side, and the proximal-side hinge 50 is in the upright state (the folded load receiving platform 5 is folded above the link mechanism distal end side bracket 54 and the link mechanism 4. The bolt-shaped stopper piece 91a is retracted downward from the position directly inward of the guide rail 12 while the base end side hinge 50 is in a lying state (the load receiving platform 5 is deployed behind the link mechanism 4). And a link mechanism 91 that causes the stopper piece 91a to protrude directly inwardly of the guide rail 12 and a fixed position in the middle of the inner surface of the guide rail 12 so that the stopper piece 91a is in the protruding position (see FIG. 3 and FIG. 3). The stopper piece 91a slides further forward on the load receiving platform 5 that slides forward from the unfolded / folded position when it is positioned at the position shown in FIG. And a contact member 92 for positioning the receiving platform 5 to the lifting working position to restrict the abutment.
[0032]
The link mechanism 91 includes two large and small distal arms 91b and 91c whose base ends are rotatably coupled to the pivot 42b of the distal end of the connecting link 42, and the distal end and the base of the smaller distal arm 91c. A second link 91d whose both ends are pivotally connected to the end hinge 50, and two large and small proximal arms 91e, 91f respectively connected to the pivot 42a of the base end portion of the connection link 42, respectively; Of these, a long link 91g whose both ends are rotatably connected to the distal end of the large proximal arm 91e and the distal end of the large distal arm 91b, and the pivot 42a of the proximal end of the coupling link 42 An L-shaped arm 9 having a substantially central corner portion pivotally supported by the mounting member 3 via a bracket 91h at the immediately preceding position and having a stopper piece 91a at one end is formed in a substantially L shape. i, a third link 91j having one end rotatably supported by the other end of the L-shaped arm 91i, and one end rotatably supported by the other end of the third link 91j. The fourth link 91k is connected to the pivot 42a at the base end of the connection link 42 so as to rotate together. In this case, the distal end of the small proximal arm 91f is moved by the urging force of the urging spring 81i when the two large and small proximal arms 91e and 91f are rotated clockwise around the pivot 42a of the base end of the connecting link 42. The stopper piece 81a abuts on the turning locus of the turning bracket 63, and the stopper piece 81a is held in the advancing position so as not to move.
[0033]
That is, the lifting work positioning means 9 moves the stopper piece 91a at one end of the L-shaped arm 91i to the inner surface of the guide rail 12 when the unfolded load receiving platform 5 is slid forward by a predetermined amount from the unfolded / folded position. By restricting the sliding movement of the load receiving table 5 further forward by contacting the contact member 92 at the midway position, the load receiving table 5 deployed in the unfolded / folded position is positioned at the lifting / lowering work position. ing.
[0034]
Further, the contact member 92 includes a rolling surface 92a on the lower surface thereof for rolling in a state where the roller 81f of the stopper mechanism 81 is pressed downward.
[0035]
Next, the positioning operation of the load receiving platform 5 by the positioning device 7, that is, the positioning operation to the storage height position when the load receiving platform 5 is stored by the storage height positioning means 8, and the lifting and lowering of the load receiving platform 5 by the lifting operation positioning means 9. The positioning operation to the work position will be described with reference to FIGS.
[0036]
First, the positioning operation of the load receiving platform 5 to the lifting / lowering work position by the lifting / lowering work positioning means 9 will be described.
[0037]
In the retracted position (the position shown in FIG. 2) of the frontmost guide rail 12 below the loading platform 1, the folded luggage receiving platform 5 is folded and placed above the link mechanism front end side bracket 54 and the link mechanism 4. From the retracted position, the load receiving platform 5 is pulled backward to the unfolded / folded position (position shown in FIG. 5) at the rearmost end of the guide rail 12. In this unfolding / retracting position, the front end side member 51 and the base end side member 52 folded in half are extended to the rear of the link mechanism front end side bracket 54 and the link mechanism 4 to expand the load receiving platform 5.
[0038]
In this manner, the load receiving platform 5 is deployed behind the link mechanism distal end side bracket 54 and the link mechanism 4 to convert the proximal end side hinge 50 into a lying state (the state shown in FIGS. 3 and 4). By converting the proximal-side hinge 50 into the lying down state, the second link 91d is pushed forward, the two large and small distal-side arms 91b, 91c are rotated counterclockwise, and the long link 91g is pushed forward. As a result, the L-shaped arm 91i is rotated counterclockwise around the axis of the bracket 91h via the third link 91j, the pivot 42a at the base end of the connecting link 42, and the fourth link 91k. Position in the protruding position (position shown in FIGS. 3 and 4). Then, when the unfolded load receiving platform 5 is slid forward by a predetermined amount from the unfolded / folded position, the stopper piece 91a comes into contact with the contact member 92, and further sliding movement of the load receiving platform 5 further forward is restricted. Thus, the cargo receiving platform 5 is positioned at the lifting / lowering work position.
[0039]
At this time, as shown in FIG. 4, when the unfolded load receiving platform 5 is slid forward from the unfolded / folded position, the roller 81f of the stopper mechanism 81 rolls on the rolling surface 91a on the lower surface of the contact member 92. Accordingly, the rotation shaft 81b is rotated counterclockwise, and the first bracket 81c rotates counterclockwise by the urging force of the winding spring 81j against the urging force of the urging spring 81i (see FIG. By rotating counterclockwise in this case, the stopper piece 81a is rotated clockwise around the axis of the tip of the second bracket 81d via the first link 81e, and the tip of the stopper piece 81a is moved to the rotation bracket 63. Since the tip of the stopper piece 81a does not come into contact with the contact piece 82 of the rotary bracket 63, the lift piece is moved up and down. So that the receiving platform 5 is moved up and down smoothly in the vertical direction.
[0040]
Next, the positioning operation at the storage height position of the load receiving tray 5 by the storage height positioning means 8 will be described.
[0041]
The link mechanism is lowered at the unfolding / folding position of the rear end of the guide rail 12, and the load receiving platform 5 lowered onto the ground is folded in two and then folded and placed above the link mechanism front end side bracket 54 and the link mechanism 4. .
[0042]
In this way, the load receiving platform 5 is folded and placed above the link mechanism distal end side bracket 54 and the link mechanism 4, so that the proximal end side hinge 50 is raised (the state shown in FIGS. 2, 5, and 6). ). By converting the proximal end hinge 50 to the standing state, the second link 91d is pulled backward to rotate the two large and small distal arms 91b, 91c clockwise, and the long link 91g is pulled backward. As a result, the L-shaped arm 91i is rotated clockwise around the axis of the bracket 91h via the third link 91j, the pivot 42a at the base end portion of the connecting link 42, and the fourth link 91k, thereby bringing the stopper piece 91a into the immersive position. (Position shown in FIG. 2, FIG. 5 and FIG. 6) and the two large and small proximal arms 91e and 91f are rotated clockwise around the pivot 42a at the proximal end of the connecting link 42. At this time, when the two base end side arms 91e and 91f are rotated in the clockwise direction, a small base is provided on the stopper piece 81a that has advanced on the rotation locus of the rotation bracket 63 by the urging force of the urging spring 81i. The tip of the end side arm 91f comes into contact with the stopper piece 81a so that the stopper piece 81a cannot be moved to the advanced position.
[0043]
Then, when the load receiving platform 5 that has been lowered to the ground in the unfolded / folded position is raised upward by the link mechanism 4, as shown in FIG. 5, the contact piece 82 of the rotating bracket 63 is brought into contact with the tip of the stopper piece 81a. The folded load receiving base 5 is positioned at the retracted height position by restricting the further upward rotation of the rotation bracket 63 in contact therewith.
[0044]
Then, when the load receiving platform 5 is slid forward from the unfolded / folded position of the rear end of the guide rail 12, as shown in FIG. 6, the contact member 92 does not contact the stopper piece 91a positioned at the immersion position. As shown in FIG. 2, the cargo receiving platform 5 is stored in the storage position at the foremost end of the guide rail 12.
[0045]
At this time, the roller 81f of the stopper mechanism 81 rolls on the rolling surface 91a on the lower surface of the contact member 92 and is pushed downward by the sliding movement forward from the unfolded / folded position of the load receiving platform 5. The stopper piece 81a positioned at the advanced position by the contact of the distal end of the small proximal arm 91f causes the downward force of the roller 81f to be applied to the winding spring 81j between the first bracket 81c and the third bracket 81h. By absorbing by deformation, the stopper piece 81a is held in the advanced position.
[0046]
Therefore, in the present embodiment, the front end side member 51 and the proximal end side member 52 are folded in half while the load receiving platform 5 is grounded at the unfolded / folded position when retracted, and the link mechanism distal end side bracket 54 and The load receiving base 5 folded and placed above the link mechanism 4 is pivoted to the tip of the stopper piece 81a at a storage height position that can be slid with respect to the storage position below the load base 1 when raised by the link mechanism 4. When the abutting piece 82 of the abutting portion 63 abuts, the pivoting bracket 63 is prevented from pivoting further upward, and the stowage height positioning means 8 mechanically positions the load receiving platform 5 at the stowing height position. Will be made. Therefore, unlike the case where the storage height position is detected by an electrical position detection sensor or the like, there is no variation in the detection position of the load receiving stand due to poor adjustment of the sensor mounting position or unevenness of the road surface. As a result, even if the cargo cradle 5 is slid forward along the guide rail 12, the cargo cradle 5 does not interfere with the floor bottom of the cargo bed 1, the rear wheel suspension device, etc. It is possible to accurately stop at this position.
[0047]
Further, the front end side member 51 and the base end side member 52 folded in two at the unfolded / folded position of the rear end of the guide rail 12 are extended to the rear side of the link mechanism front end side bracket 54 and the link mechanism 4 so as to work. When the load receiving platform 5 deployed in the forward direction is slid forward by a predetermined amount, the stopper piece 91a comes into contact with the contact member 92 at the lifting / lowering operation position, so that further forward movement of the load receiving platform 5 is restricted. Thus, positioning at the lifting / lowering work position by the lifting / lowering work positioning means 9 is mechanically performed. Thereby, the load receiving platform 5 that slides forward along the guide rail 12 from the unfolded / folded position of the rear end of the guide rail 12 can be accurately stopped at the lifting / lowering operation position in the middle of the guide rail 12.
[0048]
【The invention's effect】
As described above, according to the load receiving platform positioning device of the load receiving platform lifting apparatus of the first aspect of the present invention, the load receiving platform is stored when the load receiving platform folded at the time of storing the load receiving platform is raised by the link mechanism. By making contact at the height position, positioning at the storage height position by the storage height positioning means is mechanically performed, so that the load receiving platform can be accurately stopped at the storage height position.
[0049]
Furthermore, according to the load receiving platform positioning device in the load receiving platform lifting / lowering apparatus according to claim 2 of the present invention, the load receiving platform is moved up and down when the load receiving platform deployed in the working state is slid forward by a predetermined amount from the unfolded / folded position. By making contact at the work position, positioning at the lift work position by the lift work positioning means is mechanically performed, so that the load receiving platform can be accurately stopped at the lift work position in the middle of the rail.
[Brief description of the drawings]
FIG. 1 is a plan view showing a schematic configuration of a substantially right half of a load receiving table lifting device provided with a load receiving table positioning device according to an embodiment of the present invention.
FIG. 2 is a side view of the positioning device showing a state where the cargo receiving platform is stored in the storage position.
FIG. 3 is a side view of the positioning device showing a state where the cargo receiving platform is expanded at the expanded / folded position.
FIG. 4 is a side view of the positioning device showing a state where positioning is possible at the lifting work position by the lifting work positioning means.
FIG. 5 is a side view of the positioning device showing a state in which the load receiving stand is folded at the unfolded / folded position.
FIG. 6 is a side view of the positioning device when passing the lifting / lowering work position in a state in which the load receiving table is folded at the unfolded / folded position.
[Explanation of symbols]
1 cargo bed
2 Loading platform lifting device
4 Link mechanism
41 Lift link (downward link)
42 Link (Uplink)
5 Receiving platform
7 Positioning device
8 Storage height positioning means
9 Lifting work positioning means

Claims (3)

The loading platform is provided on the loading platform through a link mechanism having two upper and lower upper links and a lower link. The loading platform can be moved up and down, and the loading platform is folded back and forth to slide to a storage position below the loading platform. Configured to be
The load receiving platform is expanded from the folded state in the state of being slid and pulled out to the rear of the loading platform, and the unfolded / folded position for folding from the working state, and the predetermined amount slides forward from the unfolded / folded position. It is configured to be mutually convertible to the lifting work position that lifts and lowers the load receiving platform,
A storage height positioning means is provided for positioning the load receiving table by bringing the load receiving table into contact with the storage position at a storage height position slidable when the load receiving table is lifted by the link mechanism. A positioning device for a load receiving table in the load receiving table lifting device. In the positioning device of the load receiving platform in the load receiving platform lifting device according to claim 1,
Elevating operation positioning means is provided for positioning the load receiving table in a working state when the load receiving table is slid forward by a predetermined amount from the unfolded / folded position to contact the load receiving table at the elevating operation position. The positioning device of the load receiving table in the load receiving table lifting device. The loading platform is provided on the loading platform through a link mechanism having two upper and lower upper links and a lower link. The loading platform can be moved up and down, and the loading platform is folded back and forth to slide to a storage position below the loading platform. Configured to be
The load receiving platform is expanded from the folded state in the state of being slid and pulled out to the rear of the loading platform, and the unfolded / folded position for folding from the working state, and the predetermined amount slides forward from the unfolded / folded position. It is configured to be mutually convertible to the lifting work position that lifts and lowers the load receiving platform,
Elevating operation positioning means is provided for positioning the load receiving table in a working state when the load receiving table is slid forward by a predetermined amount from the unfolded / folded position to contact the load receiving table at the elevating operation position. The positioning device of the load receiving table in the load receiving table lifting device.

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