JP5202996B2 - Loading platform lifting device - Google Patents

Description

  The present invention relates to a load receiving platform lifting device that is attached to a loading platform of a cargo vehicle and is used for loading and unloading loads.

  For example, Patent Document 1 discloses a load receiving table lifting device attached to a loading platform of a cargo vehicle. FIG. 10 is an explanatory view of the load receiving table lifting device described in Patent Document 1. FIG. The load receiving device lifting device includes a load receiving table 40 on which a load is loaded, a support frame 41 that supports the load receiving table 40, a base bracket 43 that is attached to the upper surface of a load carrier 42 of a freight vehicle, and a base portion of the base bracket 43. And an arm body 44 to which the support frame 41 is attached. When the arm body 44 is rotationally driven, the load receiving platform 40 is located between the raised position on the load platform 42 (state shown by a broken line) and the ground position at the rear of the vehicle (state shown by a two-dot chain line). Go up and down.

  The front end portion (the left end portion in FIG. 10) of the load receiving platform 40 is supported by a shaft 45 at the lower end portion of the support frame 41 so as to be rotatable, and the load receiving platform 40 has a horizontal upper surface and is used for loading a load. The state changes between the state (shown by a broken line, a one-dot chain line, and a two-dot chain line in FIG. 10) and a retracted state (state shown by a solid line in FIG. 10) standing at the raised position. By placing the load receiving table 40 in the retracted state, the load receiving table 40 is prevented from protruding rearward during vehicle travel. Further, the load receiving table 40 can be bent by a hinge 46, and prevents the vehicle driver from hindering the rear view of the vehicle by the load receiving table 40 in the retracted state.

Japanese Examined Patent Publication No. 57-53214 (see Fig. 1)

When loading a load using the load receiving platform lifting device, the load receiving platform 40 on which the load is loaded is at a height where the upper surface 40a of the load receiving table 40 coincides with the load upper surface 42a (shown by a one-dot chain line in FIG. 10). The load is moved from the load receiving platform 40 to the loading platform 42 and loaded. At this time, since the load receiving surface 40a and the load receiving surface 42a coincide with each other, the load can be easily transferred from the load receiving table 40 to the loading table 42 without lifting the load high.
However, in order to load a large amount of luggage on the loading platform, the luggage C2 may be further stacked on the luggage C1 already loaded on the loading platform 42. At this time, even if the load receiving platform 40 is raised to the raised position, as shown by the broken line in FIG. 10, the upper surface of the load C1 is higher than the load receiving table upper surface 40a. In order to load the baggage, it is necessary to lift the luggage C2 greatly. In particular, elderly people are often engaged in farming work. When a container box containing harvested crops is placed on the loading platform 42, the work of further stacking the container box C2 on the upper surface of the container box C1 spread on the loading platform upper surface 42a is performed. This is a burden on the operator.
Therefore, in order to increase the height of the load carrier upper surface 40a in the raised position relative to the vehicle load upper surface 42a, a configuration in which the shaft 45 is provided at a high position is conceivable. However, in this case, when the load receiving platform 40 is set in the retracted state, the upright load receiving platform 40 becomes like a wall extending from the shaft 45 to a higher position with respect to its entire length, and therefore the load receiving platform 40 can be bent by the hinge 46. However, the visibility to the rear of the vehicle is deteriorated for the driver of the vehicle. In addition, when the load receiving platform 40 has a bent structure, it is necessary to expand the bent load receiving platform 40 in order to obtain a use state.

  Therefore, the present invention makes it easy to load and unload a load between the load receiving platform and the loading platform in a state where the loading platform is in the raised position above the loading platform. It is an object of the present invention to provide a load receiving table lifting device that is unlikely to be an obstacle for a driver of a vehicle.

In order to achieve the above object, the present invention provides a base portion attached to a loading platform of a vehicle, a loading platform on which loads are loaded, and a supporting portion that supports the loading platform so as to be rotatable around a rotation center line in the width direction. And an arm body that attaches the load receiving table to the base portion via the support portion in order to raise and lower the load receiving table between a rising position above the loading table and a grounding position for grounding to the ground. Rotating the load receiving table in the raised position around the rotation center line changes between a use state in which the load receiving table is in a horizontal posture and a retracted state in which the raised position is in a standing posture. It is a load receiving table lifting device, and the support portion pivotally supports the load receiving table in a state where the rotation center line is arranged in an intermediate portion in a direction orthogonal to the width direction of the load receiving table. The shaft support and the load receiving table are in the retracted state. In this case, the shaft support portion is placed at a height position that can secure a storage space for storing a portion below the shaft support portion of the load receiving stand in a standing posture between the shaft support portion and the load platform. A holding main body, and the shaft support is attached to a lower end of the main body .

According to this load receiving table lifting device, when the load receiving table is in the retracted state (ascending position), the shaft support portion is provided at a position above the load carrier by the height of the storage space.
Therefore, when the loading platform in the raised position is rotated by the shaft support portion to be used, the loading platform is located at a high position from the loading platform via the storage space. For this reason, it is easier for an operator standing on the loading platform to handle the load on the loading platform than before.
Further, when the load receiving table in the raised position is rotated by the shaft support portion to be in the retracted state, a portion below the shaft support portion in the load receiving table can be stored in the storage space. For this reason, the portion that rises from the shaft support portion is a portion that is above the shaft support portion in the load receiving table. Thus, with the direction of the full-length orthogonal to the width direction of the receiving platform (full length in the height direction in the case of standing position), not a structure rising from the shaft support, the shaft support is provided at a higher position from the loading platform Even with this configuration, the height from the loading platform to the upper end of the loading platform can be kept low. Therefore, the receiving platform in the retracted state is unlikely to obstruct the driver of the vehicle.

Moreover, it is preferable that the height dimension of the said storage space is substantially the same as the height dimension of the part below the said shaft support part in the said load receiving stand made into the said storage state.
According to this, the storage space can be minimized, and the storage space does not become unnecessarily high. For this reason, the height of the shaft support portion with respect to the loading platform does not become unnecessarily high, and as a result, it is possible to prevent the upper end of the loading platform in the retracted state from increasing.

The load receiving platform lifting device further includes a lock device that switches between a controlled state in which the load receiving base in the use state is rotated to a standing posture and a release state in which the restriction is released. preferable.
According to this, when the restricted state is set by the locking device, it is possible to prevent the load receiving base in the used state from rotating freely and being in the standing posture.
Moreover, it is preferable that the said locking device has an automatic lock part which will be automatically in the said control state, if the said receiving stand in the standing posture changes to the said use state.
According to this, in order to set it as a control state, the operation by an operator becomes unnecessary.

  According to the present invention, when the loading platform is in the retracted state (upward position), the shaft support is provided at a position above the loading platform by the height of the storage space. As a result, when the cargo cradle at the raised position is in use, the cargo cradle is at a higher position than the cargo cradle, so that loading and unloading work between the cargo cradle and the cargo bed becomes easy. In addition, when the cargo cradle is in the retracted state, the portion below the shaft support in the cargo cradle can be stored in the storage space, so the height from the cargo bed to the upper end of the cargo cradle is kept low. It is possible that the cradle in the retracted state is unlikely to obstruct the driver of the vehicle.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1, FIG. 2, FIG. 3 and FIG. 4 are side views showing an embodiment of the load receiving platform lifting apparatus of the present invention. FIG. 5 is a rear view of the load receiving table lifting device in the state shown in FIG. The cargo receiving platform lifting / lowering device 1 is attached to a cargo vehicle C and used for loading and unloading cargo between the cargo platform 11 of the cargo vehicle C and the ground.

  The load receiving platform lifting / lowering device 1 includes a load receiving platform 2 on which a load is placed. The load receiving platform 2 moves up and down between a rising position on the loading platform 11 (see FIG. 1) and a grounding position on the ground (see FIG. 3). can do. The load receiving platform 2 is a disk-shaped member having a placement surface 2a on which a load is placed. In addition, the illustrated load receiving platform lifting / lowering device 1 is attached to the rear end portion of the upper surface 11a of the load carrying platform 11, and the load receiving platform 2 includes an ascending position on the rear end portion of the loading platform 11 and a ground contact position on the rear side of the vehicle. Go up and down between. That is, the depth direction of the load receiving platform 2 in the state of FIGS. 1, 2 and 3 is made to coincide with the vehicle front-rear direction, and the width direction of the load receiving platform 2 is made to coincide with the vehicle width direction (the left-right direction of the vehicle C). ing.

  In addition to the load receiving platform 2, the load receiving platform lifting / lowering device 1 includes a base bracket (base portion) 3 attached to the upper surface 11 a of the load receiving platform 11, a support body (support portion) 7 that supports the load receiving platform 2, and a base bracket. 3 is provided with an arm body 4 that connects the support body 7 and the support body 7, a lift cylinder 5 that expands and contracts, and a power unit 6 that drives the lift cylinder 5.

  The base bracket 3 is detachably attached to the rear portion of the upper surface 11a of the loading platform 11 with bolts 12, for example. Since the base bracket 3 is attached to the loading platform 11 with the bolts 12 in this way, the loading platform lifting / lowering device 1 can be easily attached to the cargo vehicle C, and no major modification is required on the cargo vehicle C side.

  Further, when the load receiving platform lifting / lowering device 1 is not used, the base bracket 3 can be detached from the load holding platform 11 by removing the bolts 12. Thereby, the load receiving platform lifting / lowering device 1 can be detached from the vehicle C. If the loading platform lifting / lowering device 1 is permanently installed on the loading platform 11, the loadable weight of the cargo vehicle C is reduced by its own weight or the loadable space on the loading platform 11 is reduced. Therefore, this can be prevented. This is particularly effective when the cargo vehicle C is a light truck having a relatively small loadable weight and a relatively small loading space on the loading platform 11.

  The arm body 4 has a first arm 13 and a second arm 14 and constitutes a parallel link. The first arm 13 is a member extending in one direction, the base portion 13a of the first arm 13 is rotatably attached to the upper portion of the base bracket 3, and the tip portion 13b is a support 7 (a side portion to be described later). A support frame 7a) is pivotally attached to the upper part. The second arm 14 is a member extending along the first arm 13, the base portion 14 a of the second arm 14 is rotatably attached to the base bracket 3, and the tip portion 14 b is a support for the load receiving platform 2. 7 (side support frame 7a) is rotatably attached.

  The arm body 4 swings between a standing position (FIG. 1) extending upward from the base bracket 3 and a rear position (FIG. 3) extending obliquely downward toward the ground behind the vehicle. be able to. As a result, the arm body 4 that attaches the load receiving platform 2 to the base bracket 3 via the support body 7 contacts the load receiving platform 2 to the ground at the raised position (FIG. 1) above the rear portion of the loading platform 11 and the rear of the vehicle. It is possible to move up and down between the ground contact position (FIG. 3). Moreover, since the arm body 4 comprises the parallel link as shown in FIGS. 1-3, it can be raised / lowered with the cargo receiving stand 2 made into a horizontal attitude | position.

  Further, since the base bracket 3 is fixed to the end of the loading platform 11, even if the arm body 4 is rotated to ground the loading platform 2, the arm body 4 is unlikely to contact the loading platform 11. Furthermore, the first arm 13 and the second arm 14 have a bent shape at an intermediate portion thereof, and prevent contact with the edge of the loading platform 11. Since the base bracket 3 is fixed to the end of the loading platform 11, the arm body 4 only needs to be bent slightly, so that when the loading platform 2 is set to the storage position (FIG. 4), the arm body 4 It can prevent that the dimension of the whole vehicle front-back direction becomes large.

  In FIG. 5, the support body 7 extends from the lower side of the side support frame 7a to the other side (right side) in the vehicle width direction on the one side (left side) in the vehicle width direction. And a lower support frame 7b fixed to the lower portion. The side support frame 7 a has a vertically long box shape, and is open to the front of the vehicle in order to attach the arm body 4 and the lift cylinder 5. In FIG. 1 to FIG. 4, in order to facilitate the explanation of the internal structure of the side support frame 7a, the wall member on the outer side in the width direction of the side support frame 7a is omitted, In FIG. 5, the cover member at the rear of the side support frame 7a is omitted.

The support 7 supports the load receiving platform 2 so as to be rotatable around a rotation center line a in the width direction. Specifically, the lower support frame 7 b has hinge portions (shaft support portions) 8 on the left and right sides, and the load receiving platform 2 is attached to the hinge portions 8. As a result, the load receiving platform 2 can be rotated around the rotation center line a by the hinge portion 8. That is, the axis of the hinge shaft 9 that the hinge portion 8 has becomes the rotation center line a.
Moreover, the hinge part 8 is attached to the intermediate part of the depth direction of the load receiving stand 2 in a horizontal posture. In addition, when the load receiving stand 2 is in a standing posture, it is an intermediate portion in the height direction. Thereby, the rotation center line a is positioned at the intermediate portion in the depth direction of the load receiving platform 2, and the load receiving platform 2 is pivotally supported by the hinge portion 8. In the embodiment, the rotation center line a is located at an intermediate portion near the base end portion 21 of the load receiving platform 2.

  And in order to make it the use state (state of FIGS. 1-3) which loads and unloads a load, the load receiving stand 2 is rotated by the hinge part 8, and it keeps the mounting surface 2a facing up horizontally. Let That is, the base end portion 21 that is the front side in the vehicle front-rear direction of the load receiving platform 2 and the front end portion 22 that is the rear side are maintained at substantially the same height. Although not shown in the figure, the horizontal posture is maintained in this manner, since the contact receiving part 2 is provided with the contact part, the support body 7 is provided with the contact part, and the contact part is the contact part. This is because the contact table 2 in use is restricted from rotating clockwise in FIGS. 1 to 3 by contacting.

Then, as shown in FIG. 4, the load receiving platform 2 in the raised position is rotated by 90 ° with the hinge portion 8, whereby the storage state is folded with respect to the side support frame 7 a. That is, the base end portion 21 of the load receiving platform 2 is in the lower position, the tip end portion 22 is in the upper position, and the base end portion 21 and the tip end portion 22 are arranged on the same vertical plane.
Moreover, the load receiving platform lifting / lowering device 1 has a first lock device 17 (see FIG. 5) for maintaining the load receiving stand 2 in the retracted state, and the first lock device 17 is engaged with the engaging member 17a. The engagement member 17a is provided on the load receiving platform 2, and the engaged portion 17b is provided on the support body 7. The engaging member 17a is engaged with the engaged portion 17b, thereby restricting rotation of the receiving platform 2 in the retracted state in a falling direction. For example, in FIG. 5, the engaging member 17a is a pin and the engaged portion 17b is a hole, and the pin is inserted into the hole to engage with each other, thereby maintaining the retracted state. The first locking device 17 has an operation lever 17c that allows the pin to be inserted and removed from the hole. By operating (pushing and pulling) the operation lever 17c, the operator can switch between a locked state in which the receiving platform 2 is fixed in the retracted state and an unlocked state in which the fixation is released.

  The lift cylinder 5 is a hydraulic cylinder that expands and contracts to raise and lower the load receiving platform 2, and is attached between the arm body 4 and the side support frame 7 a of the support body 7. One end 5a of the lift cylinder 5 is rotatably attached to the first arm 13, and the other end 5b of the lift cylinder 5 is rotatably attached to the lower part of the side support frame 7a.

The power unit 6 is a hydraulic unit that drives the lift cylinder 5, and the power unit 6 and the lift cylinder 5 constitute a drive device that drives the cargo receiver 2 up and down. When the power unit 6 switches the supply of hydraulic oil to the lift cylinder 5, the lift cylinder 5 can perform an expansion / contraction operation. The operation of the power unit 6 is controlled by a control device (not shown) provided in the power unit 6. When the operator operates the operation unit 7c (see FIG. 5) provided on the side support member 7, the control device causes the power unit 6 to perform a predetermined operation.

  Although not shown, the power unit 6 is a hydraulic unit including a tank for storing hydraulic oil, a pump for discharging hydraulic oil, a motor for driving the pump, and various valves as a unit (as a unit). The power unit 6 is attached to the side support frame 7a.

According to the above configuration, when the power unit 6 supplies hydraulic oil to the lift cylinder 5 and the lift cylinder 5 performs the extending operation, the load receiving platform 2 in the raised position as shown in FIG. As a result, the load receiving platform 2 can be lowered to the grounding position as shown in FIG. When the lift cylinder 5 is shortened by the power unit 6, the load receiving platform 2 is raised from the ground contact position to the raised position. With this configuration, the load receiving platform lifting / lowering device 1 can perform an operation for loading and unloading the load placed on the load receiving stand 2 between the ground and the load receiving platform 11.
Furthermore, by rotating the load receiving platform 2 in the raised position about the rotation center line a (FIG. 5) by the hinge portion 8, the usage status in which the load receiving platform 2 is in a horizontal position, and the standing posture in the raised position. It is possible to change between storing states.

The structure of the support body 7 and the receiving platform 2 will be further described with reference to FIGS. 6 and 7 are views of the load receiving table lifting apparatus 1 in the state of FIG. 1 and the state of FIG. 4 as viewed from the opposite side surface.
As shown in FIG. 6, the placing surface 2 a of the load receiving platform 2 is located at a position higher than the upper end of the base bracket 3 in a state where the load receiving platform 2 is in the horizontal posture and is in the raised position on the load loading platform 11. In this state, the height h from the upper surface 11a of the loading platform 11 to the placement surface 2a can be set to about 300 mm to 400 mm. As described above, since the placement surface 2a is higher than the upper surface 11a of the loading platform 11, an operator standing on the loading platform 11 and performing a loading operation on the loading surface 2a without greatly bending his / her waist. You can carry luggage.
In addition, when a container box (not shown) is already placed on the upper surface 11a of the loading platform 11, another work (another container box) on the loading platform 2 is loaded on the container box. It becomes easy. That is, by making the height h substantially the same as the height dimension of the container box, the placement surface 2a can be aligned with the upper surface of the container box, and the load ( Another container box) can be easily transferred. Thus, the two-stage stacking operation of the container box becomes easy.

  Further, as shown in FIG. 7, since the load receiving platform 2 is attached to the support 7 so as to be rotatable by the hinge portion 8, the load receiving platform 2 is The first locking device 17 holds the mounting surface 2a in a state of facing the front of the vehicle by rotating around the rotation center line a to be a standing posture. That is, the load receiving platform 2 is in a standing posture extending in the vertical direction along the side support frame 7a and is in a folded state.

  As described above, the attachment position of the hinge portion 8 on the load receiving platform 2 is not the base end portion 21 of the load receiving platform 2 but the intermediate portion 23 between the proximal end portion 21 and the distal end portion 22. As a result, when the load receiving platform 2 in a horizontal state (the state of the two-dot chain line in FIG. 7) is rotated 90 ° around the rotation center line a, the base end is located more than the hinge portion 8 in the load receiving platform 2. The part on the side of the part 21 (referred to as the first load receiving part 31) rotates 90 ° downward. On the other hand, the portion (referred to as the second load receiving portion 32) closer to the distal end portion 22 than the hinge portion 8 in the load receiving stand 2 is rotated 90 ° upward. Thereby, the second load receiving part 32 extends upward from the hinge part 8, and the remaining part of the first load receiving part 31 extends downward from the hinge part 8. .

Thus, the side support frame 7a and the lower support frame 7b, which are the main body of the support body 7, are configured to hold the hinge portion 8 at a predetermined height position. The predetermined height position is a storage space for storing the first load receiving portion 31 in an upright position between the hinge portion 8 and the upper surface 11a of the loading platform 11 of the vehicle C when the load receiving stand 2 is in the retracted state. This is a position where S can be secured. The storage space S corresponds to a vertical space between the upper surface 11a of the loading platform 11 and the hinge portion 8, and the first load receiving platform 31 is present in this space.
In order to provide the hinge portion 8 at such a height position, in the retracted state of FIG. 7, the height dimension Y1 from the upper end of the support body 7 to the hinge section 8 (rotation center line a) is Is set to be smaller than the height dimension Y2 from the upper end to the pivot pin (at least one of 10a and 10b) that attaches the arm body 4 to the base bracket 3 (Y1 <Y2).

  From the above, when the load receiving platform 2 is in the raised position, the hinge portion 8 is provided at a position above the loading platform 11 of the vehicle C by the height of the storage space S. According to this configuration, when the load receiving platform 2 in the raised position is rotated by the hinge portion 8 to be in a use state (FIG. 6), the load receiving platform 2 is placed at a higher position from the upper surface 11a of the load loading platform 11 via the storage space S. Exists. That is, the cargo receiving platform 2 can have a height corresponding to the storage space S with respect to the loading platform 11. Therefore, as described in the case of the container box, an operator standing on the loading platform 11 can handle the luggage on the loading platform 2 more easily than the conventional case (see FIG. 10), and the space between the loading platform 2 and the loading platform 11. This makes it easier to load and unload luggage.

  Further, when the load receiving platform 2 in the raised position is rotated by the hinge portion 8 to be stored (FIG. 7), the first load receiving platform 31 of the load receiving platform 2 is stored in the storage space S in an upright posture. can do. For this reason, the part rising from the hinge portion 8 is the second load receiving portion 32 of the load receiving portion 2. In this way, the overall length in the depth direction of the cargo cradle 2 (the total length in the height direction in the case of a standing posture) is not configured to rise from the hinge portion 8, and the hinge portion 8 is provided at a high position from the cargo bed 11. Even with this configuration, the height from the loading platform 11 to the upper end of the loading platform 2 can be kept low. Therefore, it is possible to prevent the rear visibility of the driver of the vehicle C from being deteriorated by the load receiving platform 2.

The height dimension L2 of the storage space S is substantially the same as the height dimension (length dimension L1 in the depth direction) of the first load receiving base 31 in the load receiving base 2 in the storage state. In order to avoid contact with the loading platform 11 when the loading platform 2 is rotated, the height dimension L2 of the storage space S is the height of the first loading platform 31 in the loaded platform 2 in the stored state. It is set slightly longer than the dimension L1. It is preferable that the first load receiving table 31 has a length of one quarter or more of the entire length in the depth direction of the load receiving table 2. Moreover, it is preferable that the 1st goods receiving stand part 31 has the length of 1/2 or less of the full length direction full length of the goods receiving stand 2. FIG.
According to this, in order to store the first load receiving table 31 in the storage space S in an upright posture, the necessary height dimension L2 can be ensured, and the storage space S does not become unnecessarily high. For this reason, the height of the hinge part 8 with respect to the loading platform 11 is not increased unnecessarily, and as a result, the upper end of the loading platform 2 in the retracted state can be prevented from becoming higher. Accordingly, it is possible to more effectively prevent the rear visibility from being deteriorated.

  Further, as shown in FIG. 4, in the retracted state, the support body 7 is present above the base bracket 3, and the arm body 4, the support body 7, and the support body 7 are within the range in the depth direction of the base bracket 3. A load receiving platform 2 exists, and the size of the load receiving platform lifting / lowering device 1 in the depth direction is reduced. Thus, the volume of the loading platform lifting / lowering device 1 in the retracted state is reduced, and it is possible to suppress a reduction in the loading space of the loading platform 11.

  Further, as shown in FIG. 2, the load receiving platform lifting / lowering device 1 can stop the load receiving platform 2 in a state where the placement surface 2 a of the load receiving platform 2 is at the same height as the upper surface 11 a of the load receiving platform 11. And in this state, it will be in the state where the front edge part of the mounting surface 2a approached the rear edge part of the loading platform 11, and both clearance gaps can be made small. In this way, by setting the load receiving platform 2 to the same height as the load receiving platform 11, the load (for example, a cart on which the load is loaded or a small tiller) is moved forward or backward between the load receiving platform 2 and the loading platform 11. Baggage can be transferred. Further, even if the support body 7 has a trajectory passing through a position far away from the loading platform 11 due to the rotation of the arm body 4, the first load receiving platform portion 31 of the loading platform 2 can be moved from the support body 7 to the loading platform. Since it protrudes so that it may extend to 11 side, the base end part 21 of the said 1st load receiving stand part 31 will be in the state which adjoined the load stand 11, and can make the clearance gap between both small.

Moreover, this load receiving table raising / lowering apparatus 1 is provided with the 2nd locking device 18 (refer FIG. 5). The second locking device 18 is in a restricted state that restricts the load receiving platform 2 in the use state (FIGS. 1 to 3 and 6) from rotating to the standing posture (FIGS. 4, 5 and 7), Switching to a release state in which the restriction is released. Further, the second lock device 18 has an automatic lock portion that automatically sets the load receiving platform 2 in the standing posture to the restricted state when it is changed to the use state.
Specifically, the second locking device 18 includes a first engagement member 18a fixed to the lower part of the support body 7 (side support frame 7a) and a second engagement member provided on the load receiving platform 2 in FIG. And a joint member 18b. The second engagement member 18b is provided closer to the base end 21 (the first load receiving portion 31) of the load receiving platform 2 than the hinge portion 8, and the first engaging member 18a uses the load receiving stand 2. When it is in a state, it is provided at a position corresponding to the second engagement member 18b (position where it abuts).

  8 and 9 are explanatory diagrams for explaining the operation of the second locking device 18. FIG. 8 shows a state in which the load receiving platform 2 that has been in the retracted state is rotated and approaches the use state. As the use state is approached, the second engagement member 18b rises (arrow U) and moves downward to the first engagement member 18a. Approach from. When the load receiving platform 2 is further rotated so as to be in use, the second engagement member 18b comes into contact with the first engagement member 18a (in the state of the broken line in FIG. 8), and the rotation continues further. The second engagement member 18b moves toward the center in the width direction of the load receiving tray 2 against the elastic member (spring) 18c while keeping the contact (arrow e). The engaging member 18a can be climbed to the upper side (state of FIG. 9). Note that the lower surface (contact surface) of the first engagement member 18a and the upper surface (contact surface) of the second engagement member 18b have a curved convex shape or a shape having an inclined surface in order to facilitate the overcoming. It has become.

When the state of FIG. 9, the elastic member 18 c biases the second engaging member 18b, the second engagement member 18b is restored outward in the width direction of the base position of the receiving platform 2 (arrow f), the The state is such that the lower surface of the second engagement member 18b is placed on the upper surface of the one engagement member 18a (engaged state). As a result, the load receiving platform 2 cannot be rotated in the retracted direction, and is in the restricted state. Further, in this way, the operation for setting the restricted state is automatically performed by the elastic member 18c functioning as an automatic lock portion, and the operation by the operator is not necessary. That is, the second locking device 18 urges and moves the second engagement member 18b in the direction in which the second engagement member 18b is engaged with the first engagement member 18a when the load receiving platform 2 in the standing posture changes to the use state. The elastic member 18c that makes the first engagement member 18a and the second engagement member 18b engage with each other is provided as an automatic lock portion. Furthermore, the elastic member 18c is arranged so that the second engagement member 18b can get over the first engagement member 18a while abutting against the first engagement member 18a immediately before the load receiving platform 2 is in use. It is preferable that the first engaging member 18a and the second engaging member 18b that are compressed and further have the contact surfaces of the first engaging member 18a and the second engaging member 18b as an automatic lock portion.

  In FIG. 5, a rod-like connecting member 18d is connected to the second engaging member 18b, and an operating portion 18e is provided at the end of the connecting member 18d. The operator pulls the connecting member 18d against the elastic member 18c by the operation portion 18e, and moves the second engaging member 18b in the direction away from the first engaging member 18a in the width direction (arrow g direction in FIG. 9). Then, the cargo receiving platform 2 can move in the direction of the retracted state, and the second lock device 18 is in the released state in which the restriction state is released.

According to the second locking device 18 configured as described above, when the restricted state is set, it is possible to prevent the load receiving platform 2 in the used state from rotating freely and being in a standing posture (stored state). . In particular, since the load receiving platform 2 has a first load receiving platform 31 on the front side of the vehicle with respect to the hinge 8 that can load a load, the load is loaded on the first load receiving platform 31. A moment is generated in the direction in which the receiving platform 2 is in the retracted state. However, the second lock device 18 can prevent the load receiving table 2 from rotating, and the load receiving device lifting / lowering device 1 can be made safe.
In the above-described embodiment, the case where the second engagement member 18b is moved relative to the first engagement member 18a in the fixed state has been described. The member 18b may be fixed to the load receiving platform 2 and the first engagement member 18a may be attached to the support 7 (side support frame 7a) so as to be movable. Also in this case, the first engagement member 18a may be urged toward the second engagement member 18b by the elastic member 18c as described above.

Luggage (hereinafter, container box, more specifically explained with a resin container box for accommodating the crop) describing a specific method for stacking two stages over the loading platform 11. In FIG. 4, the loading platform lifting device 1 is in the retracted state, and the loading platform 11 of the vehicle C is in an unloaded state. The operator pulls the operation lever 17c (see FIG. 5) of the first locking device 17, releases the first locking device 17, and deploys the load receiving platform 2 to a horizontal posture. At this time, the load receiving platform 2 is automatically constrained to a horizontal posture by the function of the automatic locking portion of the second locking device 18, and the posture is maintained.
Then, the lift cylinder 5 is contracted, the load receiving platform 2 is lowered to the ground contact position in FIG. 3, and a container box is placed on the load receiving platform 2 (operation 1). At this time, there is only a step corresponding to the height of the load receiving table 2 between the ground and the placement surface (upper surface) 2a of the load receiving table 2, and it is not necessary to lift the container box greatly. For this reason, this loading operation is easy.
The lift cylinder 5 is extended, the load receiving platform 2 is raised to the height of the upper surface 11a of the loading platform 11 (FIG. 2), and the container box on the load receiving platform 2 is transferred onto the loading platform 11 (operation 2). At this time, the loading surface 2a of the cargo receiving platform 2 and the upper surface 11a of the loading platform 11 coincide with each other and the front and rear clearances thereof are small, so there is no need to lift the container box greatly. The container box can be slid and moved on the placement surface 2a and the upper surface 11a.
The work 1 and the work 2 are repeatedly performed until the container box is spread on the loading platform 11. As a result, the container box C1 is spread on the loading platform 11 and placed on the first stage (see FIG. 6).

Next, the work of loading the container box as the second stage will be described.
The lift cylinder 5 is contracted, the load receiving platform 2 is lowered to the ground contact position in FIG. 3, and a container box is placed on the load receiving platform 2 (operation 3). The lift cylinder 5 is extended to raise the load receiving table 2 to the raised position (FIG. 1), and the container box on the load receiving table 2 is transferred to the upper surface of the first-stage container box C1 (operation 4: see FIG. 6). . At this time, since the placement surface 2a of the load receiving platform 2 and the upper surface of the first-stage container box C1 coincide with each other, it is not necessary to lift the container box on the load receiving platform 2 greatly. In addition, when the first-stage container box C1 exists near the cargo receiving platform 2 in the raised position, and the gap between the placement surface 2a of the cargo receiving platform 2 and the upper surface of the container box C1 is small, the container box on the cargo receiving platform 2 Can be slid and moved on the mounting surface 2a and the upper surface of the first-stage container box.

The operations 3 and 4 are repeated, and the container box C2 is loaded on the loading platform 11 as the second stage (see FIG. 6). When this two-stage loading is completed, the load receiving platform 2 is set to the raised position, the second locking device is released, and the load receiving platform 2 is raised to the retracted state (FIG. 4).
And the vehicle C is made to drive and a container box is transferred to the destination. At this time, two-stage container boxes are loaded on the loading platform 11, and twice as many container boxes can be transferred as compared with the case of single-stage loading. Therefore, in the past, it was difficult for elderly workers to stack container boxes in two stages. However, according to the present invention, this can be facilitated, and container boxes are transported in one stage. Since the transfer amount is doubled compared to when the transfer is performed, the transfer work can be halved and the work efficiency is improved.
In addition, the operation | work which lowers the container box on the loading platform 11 to the ground can be performed by performing the reverse of the said operation | work.
In addition, although the case of two-stage stacking has been described, three-stage stacking may be performed. In this case as well, the operation of loading the container box in the second stage is the same as described above, and the upper surface of the container box in the first stage and the receiving of the cargo. What is necessary is just to stop the raise of the receiving platform 2 at the height which the mounting surface 2a of the base 2 corresponds.

In addition, the load receiving platform lifting / lowering device 1 of the present invention is not limited to the illustrated form, and may take other forms within the scope of the present invention. In the above-described embodiment, the shaft support portion has been described as the hinge portion 8, but in addition to this, the shaft support portion may be configured as a shaft and a bearing portion that supports the shaft so as to be rotatable around the axis.
Further, the cargo vehicle C to which the cargo receiving platform lifting apparatus 1 is attached may be other than a light truck.

  Moreover, although the said embodiment demonstrated the structure which the load receiving stand 2 raises / lowers between the raising position on the loading platform 11 and the earthing | grounding position in the back of a vehicle, as a structure other than this, the receiving stand 2 is the raising position on the loading platform 11 and a vehicle. It is good also as a structure which raises / lowers between the earthing | grounding positions in the left-right side (outside of a vehicle width direction). Thus, when it is set as the structure which lowers the load receiving stand 2 to the earthing | grounding position in the left-right side of a vehicle, the width direction of the load receiving stand 2 is made to correspond with the front-back direction of a vehicle, and the load receiving stand raising / lowering apparatus 1 demonstrated in the said embodiment is demonstrated. May be attached to the upper surface of the loading platform 11. Further, in this case, the mounting position of the load receiving platform lifting / lowering device 1 (base bracket 3) can be the front portion close to the driver's seat side, in addition to the rear portion, of the side portion (side edge portion) on the upper surface of the loading platform 11. .

  Furthermore, although the case where the two-stage stacking of the container boxes is facilitated has been described in the above embodiment, it may be configured to facilitate the two-stage stacking and the three-stage stacking. In this case, the container box is loaded into the second stage. The operation is the same as described above, and the ascent of the load receiving platform 2 may be stopped at a height at which the upper surface of the first-stage container box and the placement surface 2a of the load receiving platform 2 coincide. Further, when the container box is loaded on the third level, the load receiving platform 2 is further raised, and the upper surface of the second stage container box and the mounting surface 2a of the load receiving platform 2 coincide with each other. What is necessary is just to stop 2 raise.

It is a side view which shows one Embodiment of the cargo receiving stand raising / lowering apparatus of this invention. It is a side view of a cargo receiving platform raising / lowering apparatus, and is a state in which a cargo receiving platform is in the middle of the raising / lowering direction. It is a side view of a load receiving table raising / lowering apparatus, and is a state in which a load receiving stand is in a grounding position. It is a side view of a load receiving table raising / lowering apparatus, and the load receiving stand is in a retracted state. It is a rear view of the load receiving table raising / lowering apparatus of FIG. It is a side view of a load receiving table lifting device. It is a side view of a load receiving table lifting device. It is explanatory drawing explaining operation | movement of a 2nd locking device. It is explanatory drawing explaining operation | movement of a 2nd locking device. It is explanatory drawing of the conventional cargo receiving stand raising / lowering apparatus.

Explanation of symbols

1 Cargo stand lifting device 2 Cargo stand 3 Base bracket (base part)
4 Arm body 7 Support body (support part)
7a Side support frame (main part)
7b Lower support frame (main part)
8 Hinge (shaft support)
DESCRIPTION OF SYMBOLS 11 Loading platform 13 1st arm 14 2nd arm 17 1st locking device 18 2nd locking device 18c Elastic member (automatic locking part)
31 First load receiving part 32 Second load receiving part a Turning center line C Cargo vehicle (vehicle)
L1 Height dimension of the first load receiving part L2 Height dimension of the storage space S Storage space

Claims (4)

A base portion attached to a loading platform of a vehicle; a loading platform on which a load is placed; a support portion that supports the loading platform so as to be rotatable around a rotation center line in a width direction; and the loading platform above the loading platform. An arm body that attaches the load receiving table to the base part via the support part in order to move up and down between the ascending position and the grounding position that contacts the ground,
By rotating the load receiving table in the raised position about the rotation center line, the load receiving device changes between a use state in which the load receiving table is in a horizontal position and a retracted state in which the raised position is in an upright position. A table lifting device,
The support part is
A shaft support portion that pivotally supports the load receiving base in a state in which the rotation center line is disposed at an intermediate portion in a direction orthogonal to the width direction of the load receiving base;
When the load receiving platform is in the retracted state, it is possible to secure a storage space for storing a portion below the shaft support portion of the load receiving table in an upright position between the shaft support portion and the load platform. A main body holding the shaft support at a height position that can be made;
Have,
The load receiving platform elevating device, wherein the shaft support portion is attached to a lower end of the main body portion .   The height of the storage space is substantially the same as a height of a portion below the shaft support portion of the load receiving table in the storage state.   The load receiving device according to claim 1, further comprising: a lock device that switches between a restricted state that restricts rotation of the load receiving base in the use state to a standing posture and a released state that releases the restriction. Stand lifting device.   The load receiving device lifting / lowering device according to claim 3, wherein the lock device includes an automatic lock portion that automatically sets the restricted state when the load receiving stand in the standing posture changes to the use state.

Images