JPH11123975A - Stopper device in unloading platform elevating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To quicken the loading and unloading of a cargo by getting an engaging means of the unloading platform side engaged with and disengaged from a member to be engaged provided on a stoppers, and providing the engaging means with a guide member for guiding and holding the engaging means to the engagement position and the retreat position by turning operation of the operating means, and sliding the same in the engagement releasing direction. SOLUTION: In the case of loading a load-carrying platform with a cargo, when an operating lever is turned, a guide member 26 is pushed outward, so that an engaging member 24 is slid from the engagement position to a retreat position, and a stopper 18 released from the engagement is turned upward to be held in a projecting position. Subsequently, when a cart loaded with a cargo is moved onto a cargo receiving talbe, front and rear wheel step over the stopper 18, and the stopper 18 is held in the projecting position. The cargo receiving table is raised, and a cart is moved to a plat from. After loading, when the operating layer 25 is turned to move inward the guide member 26, the engaging member 24 is held from the retreat position in the engagement position. When the stopper 18 is stepped, the engaged member 23 engages with the engaging member 24 to hold a stopper 18 in the storing position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loading / unloading device which is installed at the rear or side of a body of a truck or the like, and more particularly to a stopper device for preventing a load on the loading tray from dropping. is there.

[0002]

2. Description of the Related Art A conventional stopper device is disclosed in JP-A-8-40.
As disclosed in Japanese Unexamined Patent Publication No. 132, a stopper rotatably provided at the tip end of a receiving tray is held at a protruding position and a storage position by a first elastic means, and a stopper is provided on a second elastic means. The stopper is projected and retracted by a pedal and a selector provided on the side of the loading tray.

When the load on the loading platform is lowered to the ground by the above structure, the load is moved to the loading tray with the stopper protruded by depressing the pedal to lower the loading tray. When the loading tray is lowered to the ground, the load on the loading tray can be lowered to the ground after the stopper is depressed and held at the storage position. When the load is loaded from the ground onto the loading platform, first, the stopper is protruded by depressing the pedal, and then the selector is slid to apply the urging force of the second elastic means to the stopper. In this state, the luggage is loaded on the cart and moved to the loading tray. At this time, the cart wheel or the operator steps on the stopper, but the stopper returns to the projecting position by the urging force of the second elastic means. After that, the loading tray is raised to move the load onto the loading platform.

[0004]

In the above structure, the operation of projecting the stopper at the time of loading requires the operation of depressing the pedal and the operation of sliding the selector, which complicates the operation. There is a disadvantage that a quick loading operation cannot be performed. SUMMARY OF THE INVENTION The present invention provides a stopper device in a loading / unloading device that can perform loading / unloading operations efficiently by performing a quick and simple operation of projecting and retracting a stopper.

[0005]

SUMMARY OF THE INVENTION The present invention provides a protruding position provided at a front end of a load receiving tray which can be lifted and lowered by a drive means, and prevents the load from dropping on the load receiving tray, and allows the load to pass through. And a stopper capable of rotating between the retracted position, a resilient projecting member for urging the stopper in the protruding direction, and a lock device capable of holding and releasing the stopper at the stored position. In the stopper device of the elevating device, the lock device is provided with an engaged member provided on the stopper side, and slidably provided on the load receiving table side,
Engaging means capable of moving between an engaging position for engaging the engaged member and a retracted position for disengaging, and an engaging elastic member capable of constantly biasing the engaging means in the engaging direction Operating means rotatably provided on the engaging means side, and engaging means provided on the engaging means side and rotating the operating means at the engaging operation position to the retracting operation position And a guide member that slides in the disengagement direction.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a lorry,
The truck 1 has a cargo box 4 having a carrier 3 on a body 2. At the rear of the vehicle body 2, a loading tray lifting device 5 for loading and unloading luggage to the loading platform 3 is provided.
It is arranged through. The loading tray lifting device 5 is supported via a pair of left and right parallel link mechanisms 8 so that the pair of left and right lifting frames 7 can be moved up and down while maintaining a fixed posture. Between them, a first hydraulic cylinder 9 for driving the lifting frame 7 up and down is provided. Further, a rectangular plate-shaped loading tray 10 is pivotally mounted on each of the left and right lifting frames 7 so as to be able to turn up and down between a standing storage position (dotted chain line in FIG. 1) and a protruding position (solid line in FIG. 1). A second hydraulic cylinder 11 that raises and lowers the load receiving table 10 is interposed between the load receiving table 10 and the lifting frame 7.

As shown in FIG. 2, the receiving table 10 comprises a plurality of molding blocks 10a formed by extruding a light alloy material such as an aluminum alloy. Each of the adjacent molding blocks 10a is connected to the female connecting portion 12 and the male. It is integrally connected on one plane by coupling with the connecting portion 13. Covers 14 are fixed to both left and right side edges of the receiving table 10, so that each of the molded blocks 10a is prevented from shifting in the left-right direction. A reinforcing support member 15 is provided on the back of the
Are fixed, and the reinforcing support member 15 reinforces the loading table 10 connected by the forming block 10a.

The foremost forming block 10a is provided with a stopper device 16 according to the present invention, which prevents a load placed on the load receiving table 10 from dropping during lifting and lowering of the load receiving table 10. ing. Hereinafter, the stopper device 16 will be described. In FIG. 2 to FIG.
A recess 17 extending in the left-right direction is formed in the bottom portion 0a, and a stopper 1 is formed in a pivot portion 17a formed in the bottom surface of the recess 17.
8 is rotatably supported at its base. The pivot 1
A restricting member 19 having the same cross-sectional shape as the stopper 18 is pivotally supported on both left and right ends of 7a and fixed by the cover 14, so as to restrict the movement of the stopper 18 in the left-right direction. . A receiving portion 18a formed on the back surface of the stopper 18 and a receiving portion 17 formed on the concave portion 17
A torsion spring 20, which is an elastic member for projection, is provided between the stopper 18b and the stopper 18b to urge the stopper 18 in the projecting direction.

A stop surface 18b is provided at the tip of the stopper 18.
When the stopper 18 is rotated upward, FIG.
As shown by the dashed line, the locking surface 18b projects perpendicularly to the loading tray 10, and receives the load on the loading tray 10. When the stopper 18 is rotated downward, the locking surface 18b is stored in the recess 17 as shown by the solid line in FIG. 5, and the stopper 18 is substantially flush with the load receiving table 10, so that the load can be received without interfering with the stopper 18. It can be carried in and out. Reference numeral 21 denotes a rubber cushion, which is configured to reduce an impact sound caused by interference between the locking surface 18b and the concave portion 17 when the stopper 18 is stored.

A lock device 22 is provided at a side end of the recess 17 for holding and releasing the stopper 18 in the storage position. The locking device 22 includes an engaged member 23 fixed to the stopper 18 side as shown in FIGS. 6 to 8, an engaging member 24 which is an engaging means capable of being disengaged from the engaged member 23, An operation lever 25 which is an operation means for disengaging and engaging the engagement member 24; and a retreat position where the engagement member 24 is engaged with the engaged member 23 by the operation of the operation lever 25 and the engagement position is released. And a guide member 26 for guiding and holding each.

The engaged member 23 is fixed to the back surface of the stopper 18 via a fixing member 27, and the engaging member 24 comes into contact with a horizontal portion 23a integrally formed at a lower end thereof, whereby the stopper 18 is stopped. Is restricted. The horizontal portion 23a has a sliding surface 23b.
Is formed, and when the stopper 18 is stored, the sliding surface 2
3b contacts the engaging member 24 at the engaging position and guides the engaging member 24 in the retracting direction so that the engaging member 24 can be smoothly engaged.

The engaging member 24 is slidably inserted into a hollow cylindrical member 29 fixed to the bottom surface of the concave portion 17 via a substrate 28. The engaging member 24 is an elastic member for engagement. A certain spring 30 is provided, and the spring 30 constantly biases the engagement member 24 in the engagement direction. A rod 31 is connected to the engagement member 24 via a connection device 32, and the rod 31 is slidably inserted into a support member 33 fixed on a substrate 28. The connecting device 32 fixes a pair of L-shaped connecting members 34 to ends of the rod 31 and the engaging member 24 with bolts 35 so that respective surfaces face each other as shown in FIG. A connecting pipe 36 disposed between the connecting members 34 is fixed to the connecting member 34 with bolts 37 and nuts 38 to connect the connecting members 34 together. Thereby, even if the axis of the engaging member 24 and the axis of the rod 31 are displaced, both members can slide smoothly.

The operating lever 25 pivotally supports a boss 25a formed at the base of the operating lever 25 on a rod 31 extending outward from the support member 33. It protrudes upward. The guide member 26 is fixed to the outer end of the rod 31 with a bolt 39, the upper end thereof is bent inward, and the inner surface of the boss 25 a contacts the outer surface of the support member 33. It is in contact with the operation lever 25 in this state. Therefore, the operation lever 25 is always sandwiched between the guide member 26 and the support member 33, and the operation lever 2
The movement of the rod 5 in the axial direction of the rod 31 is restricted.

The contact portion of the guide member 26 with the operation lever 25 has a horizontal surface 26a and a tapered surface 26b. When the operation lever 25 is rotated from the horizontal surface 26a to the tapered surface 26b, as shown in FIG. Since the distance between the outer surface of the guide member 26 and the contact portion is reduced from L1 to L2, the engagement member 24 is slid in the engagement direction by the urging force of the spring 30 so as to be held at the engagement position. Has become. When the operating lever 25 is rotated from the tapered surface 26b to the horizontal surface 26a, the distance becomes longer from L2 to L1, so that the engaging member 24 slides in the retreating direction against the urging force of the spring 30, and further moves in the horizontal surface. When it reaches 26a, it is held at the retracted position. Further, when the operation lever 25 is pushed outward in a state where the operation lever 25 is in contact with the tapered surface 26b, the guide member 26 is pushed outward, and the engagement member 24 engages the spring 30 against the urging force of the spring 30. When the operation lever 25 is temporarily moved from the engagement position to the retreat position and the pressing of the operation lever 25 is released, the engagement member 2
4 moves to the engagement position by the urging force of the spring 30.

A pair of front and rear regulating members 40 formed in an L-shape are provided upright on the outer side of the guide member 26 of the concave portion 17, and the regulating member 40 is provided when the operation lever 25 is rotated. Is brought into contact with the regulating surface 40a to restrict the guide member 26 from rotating together with the operation lever 25. The regulating member 4
When the engaging member 24 is moved to the retracted position by the pressing operation of the operation lever 25, the guide member 26
By contacting the guide member 26b, the guide member 26 is restricted from moving outward more than necessary.

In the present embodiment, a torsion spring is provided as a projecting elastic member, but may be urged by a leaf spring or the like. Further, in the present embodiment, the engagement means has a configuration in which the engagement member and the rod are connected, but may be configured by a single engagement member. Further, in this embodiment, the lifting device is provided at the rear portion of the vehicle body, but the same operation and effect can be obtained by providing the lifting device at the side of the vehicle body.

The operation of the present invention having the above-described structure will now be described. While the truck 1 is running,
Reference numeral 0 denotes an upright storage position behind the packing box 4 as indicated by a chain line in FIG.
Is brought into contact with the tapered portion of the guide member 26, the engaging member 24 is engaged with and held by the engaged member 23, and the stopper 18 is held at the storage position.

In order to lower the load on the loading platform 3 from the above state to the ground, first, the second hydraulic cylinder 11 is operated to lower the loading platform 10 from the upright storage position to the overhanging extension position as shown by the solid line in FIG. Let it. Next, when the operating lever 25 is kicked outward with a foot, the engaging member 24 slides to the retracted position against the urging force of the spring 30, and the disengaged stopper 18 moves upward by the urging force of the torsion spring 20. It turns and is held in the protruding position. At that time, the operation lever 2
5 is in contact with the tapered surface 26b,
Returns to the engagement position by the urging force of the spring 30.

Next, the load on the loading platform 3 is placed on a cart and moved onto the loading platform 10, and the first hydraulic cylinder 9 is operated to lower the loading platform 10. At this time, the wheels of the cart come into contact with the locking surfaces 18b of the stoppers 18, so that the cart can be prevented from dropping from the front end of the loading tray 10. When the loading tray 10 is lowered to the ground as shown by the two-dot chain line in FIG. 1, the stopper 18 is depressed, and the stopper 18 is held at the storage position as shown by the solid line in FIG. At this time, the engaged member 23 comes into contact with the engaging member 24 at the engaging position by the downward rotation of the stopper 18, but the engaging member 24 applies the urging force of the spring 30 by the pressing force of the sliding surface 23b. When the engaged member 23 moves below the engaging member 24 to slide in the retreating direction, the engaging member 24 released from the pressing force by the engaged member 23 is pressed by the urging force of the spring 30. It can slide in the engagement direction and engage with the engaged member 2423. As a result, the stopper 18 is substantially flush with the loading tray 10, and the cart can be lowered to the ground.

Next, when loading the luggage on the ground onto the loading platform 3, the operating lever 25 is kicked by a foot from the base side of the loading platform 10 to the front side, and the operating lever 25 is rotated. Then, the operation lever 25 moves from the tapered surface 26b of the guide member 26 to the horizontal surface 26a as shown by the one-dot chain line in FIG.
4 is slid from the engagement position and held at the retracted position as shown in FIG. When the engaging member 24 retreats, the stopper 18 that has been disengaged is rotated upward by the urging force of the torsion spring 20 and held at the projecting position.

Next, the luggage on the ground is put on a cart and the
Move to 0. At this time, when the front wheel of the cart steps over the stopper 18 against the urging force of the torsion spring 20, the stopper 18
Pivots upward to the protruding position by the urging force of. Therefore, even if the operator accidentally releases his / her hand from the cart, the front wheel of the cart comes into contact with the locking surface 18b of the stopper 18, so that the cart can be prevented from returning to the ground.

When the cart is further pushed, the rear wheel of the cart steps over the stopper 18 and the stopper 18 is again held at the projecting position. Then, the loading platform 10 is raised to the loading platform 3 by the operation of the first hydraulic cylinder 9, and the cart is moved onto the loading platform 3. At this time, the rear wheel of the cart comes into contact with the locking surface 18b of the stopper 18, so that the cart can be prevented from dropping from the loading tray 10.

When the loading / unloading operation is completed, the operation lever 25 is kicked by a foot from the front side of the loading tray 10 toward the base side, and the operation lever 25 is rotated. Then the operation lever 25
6 moves from the horizontal plane 26a of the guide member 26 to the tapered surface 26b as shown by the solid line in FIG. 6, and the guide member 26 moves inward by the urging force of the spring 30, whereby the engagement member 24 slides from the retracted position and engages. It is held in the matching position. When the stopper 18 is depressed from this state, the engaged member 23 is engaged with the engaging member 24 as shown by the solid line in FIG. 5, and the stopper 18 is held at the storage position. After storing the stopper 18, the load receiving table 10 is rotated upward to be stored upright behind the packing box 4.

[0024]

As described above, according to the present invention, the engaging means is disengaged from the engaged member provided on the stopper by sliding the engaging means provided on the receiving table side. The engaging means is guided and held at the engaging position and the retreat position by the turning operation of the operating means, and the engaging means is turned by the turning operation of the operating means at the engaging operation position to the retracting operation position. The guide member is provided to slide the stopper in the disengagement direction, so that the operation of projecting and retracting the stopper can be performed in only one direction, and the work of loading and unloading the luggage can be performed quickly.

[Brief description of the drawings]

FIG. 1 is an overall view of a loading tray lifting device according to the present invention.

FIG. 2 is a cross-sectional view of a receiving table.

FIG. 3 is a partial plan view of the receiving table.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a sectional view taken along line BB of FIG. 3;

FIG. 6 is a plan view showing a lock device of the present invention.

FIG. 7 is a sectional view taken along the line CC of FIG. 6;

FIG. 8 is a sectional view taken along the line CC of FIG. 6, showing an operating state of the lock device.

[Explanation of symbols]

 Reference Signs List 5 loading tray lifting device 10 loading tray 16 stopper device 18 stopper 20 torsion spring (elastic member for projection) 22 locking device 23 engaged member 24 engaging member (engaging means) 25 operating lever (operating means) 26 guide member 30 Spring (elastic member for engagement)

Claims (1)

[Claims] The present invention is characterized in that, at a leading end of a loading tray which can be raised and lowered by a driving means as appropriate, it rotates between a projecting position on the loading tray to prevent the load from dropping and a storage position allowing the load to pass. A stopper device for a loading tray elevating device including a movable stopper, a projecting elastic member for urging the stopper in a projecting direction, and a lock device capable of holding and releasing the stopper in a storage position. The locking device is provided between an engaged member provided on the stopper side and an engaging position engaged with the engaged member and a retracted position disengaged provided on the load receiving side slidably. Engagement means capable of moving between the engagement means, an engagement elastic member capable of constantly biasing the engagement means in an engagement direction, operation means rotatably provided on the engagement means side, and the engagement means The operating hand provided on the means side and located at the engagement operating position The stopper device in receiving platform lifting device comprising a guide member for sliding engagement means in the disengaging direction by rotating operation of the retreating operation position.