JP7542856B2 - Loading and unloading cart for trucks - Google Patents

Description

The present invention relates to a loading and unloading platform for trucks, which is used when loading and unloading cargo onto and from the bed of a truck.

Truck loading and unloading operations include loading, which involves loading cargo onto the bed and tying the loaded cargo with ropes, and unloading, which involves untying the tied cargo and removing the cargo from the bed. In order to ensure the safety of such loading and unloading operations, workers must carry out loading and unloading operations by standing on a work platform located on the side of the truck and by moving between the work platform and the bed.

A work cart for use in truck loading and unloading operations has been developed as described in Patent Document 1. This work cart has a base with running wheels, which includes a horizontal bar on the front side facing the truck and a horizontal support pillar parallel to the front side on the rear side, and supports at both ends of each horizontal bar. A work stage is attached to the supports, and a ladder is provided on the supports to allow workers to get on and off between the work stage and the outside.

JP 2019-167778 A

This loading and unloading work platform is useful for workers to climb up and down between the truck bed and the ground. When transferring to the truck bed, the worker can use the ladder to climb from the ground surface to the work stage, and then transfer from the work stage to the truck bed. On the other hand, when returning from the bed to the ground, the worker can transfer from the bed to the work stage, and then use the ladder to descend from the work stage to the ground.

Loading and unloading work carts are not only used for workers to move between the loading platform and the ground via the work stage, but also for transporting cargo between the loading platform and workers by running over the work stage. When carrying out such work, the workers on the work stage always stand on the work stage and move around on it to carry out their work.

The above-mentioned conventional loading and unloading work carts are not designed for workers to drive on a work stage to hand over and receive cargo, and workers work on the work stage without wearing safety belts. This means that workers must work carefully on the work stage while feeling anxious about falling, which creates the problem of poor workability on the work stage.

The object of the present invention is to improve the workability of workers on the work stage of a loading and unloading work cart.

The loading and unloading work platform for trucks of the present invention is a loading and unloading work platform for trucks that is disposed adjacent to the bed of the truck and is used when performing loading and unloading work on the truck, and comprises a front horizontal bar on the truck side and a rear horizontal bar extending parallel to the front horizontal bar, a base on which running wheels are mounted, a work stage that is fixed to vertical front supports attached to both ends of the front horizontal bar and vertical rear supports attached to both ends of the rear horizontal bar and is disposed above the base, and a work stage of the rear supports The work platform includes a safety handrail attached to a handrail support section formed by a portion above the work platform, and a ladder attached between the front support and the rear support, allowing the worker to climb up and down between the work platform and the ground. The work platform is provided with a suspension frame that includes two vertical support rods that protrude above the work platform and are attached to the work platform, and an upper end connecting rod that is attached to the upper end of the vertical support rods. A safety block around which a wire rope worn by the worker is wound is attached to the suspension frame.

The work stage provided on the work cart body can be climbed up and down safely using a ladder. A safety block can be attached to the suspension frame provided on the work cart body, and when loading and unloading cargo on the work stage, the worker can connect the wire rope of the safety block to his/her waist belt to prevent falling from the work stage. This allows the worker to efficiently load and unload cargo without worrying about falling, improving the workability of loading and unloading operations.

1 is a perspective view of a loading and unloading work platform for a truck according to an embodiment, as viewed from the front side. FIG. 2 is a front view of the loading/unloading work platform with a worker standing on the work stage. FIG. 2 is a side view showing a loading/unloading operation carried out by a loading/unloading platform placed on the bed of a truck. FIG. 11 is a rear view of a loading and unloading work platform for a truck according to another embodiment. 5 is a side view showing a state in which the loading and unloading work platform shown in FIG. 4 is placed on the bed of a truck and a loading and unloading work is being performed. FIG. FIG. 11 is a side view showing a modified example of the traveling wheels provided on the work platform body.

The following describes in detail an embodiment of the present invention with reference to the drawings. In each drawing, common parts that constitute a loading and unloading work platform for trucks are given the same reference numerals.

The loading and unloading work platform 10 shown in Figs. 1 to 3 has a front horizontal bar 11 and a rear horizontal bar 12 extending parallel thereto, and the front horizontal bar 11 and the rear horizontal bar 12 are connected by connecting bars 13, 14 attached to both ends of the front horizontal bar 11, the rear horizontal bar 12, and the shorter connecting bars 13, 14, which form a rectangular base 15. These bars are made of metal pipes with a rectangular cross section. Support leg members 16 extending in the width direction of the base 15, i.e., in the front-rear direction, are attached to both ends of the base 15, and casters 18 equipped with running wheels 17 are attached to both ends of the support leg members 16. The loading and unloading work platform 10 has casters 18, so that the loading and unloading work platform 10 can be easily moved between the bed of a truck as a loading and unloading work site and the storage location of the loading and unloading work platform 10.

Vertical front side supports 21, 22 are attached to both ends of the front side horizontal bar 11. Also, rear side supports 23, 24 are attached to both ends of the rear side horizontal bar 12. Each support is made of a metal round pipe with a circular cross section, and a work stage 20 is attached to each support. The work stage 20 has a quadrilateral frame 25 and an expanded metal 26 attached to the frame 25 as a scaffolding board. The work stage 20 is placed above the base 15, and its height is set to the position of the truck bed. However, the height position of the work stage 20 may be set to a position close to the height of the top surface of the truck's tailgate when it is upright.

Three ladder members 31a are fixed between the front support 21 and the rear support 23, and these ladder members 31a form a ladder 31 for ascending and descending between one end of the base 15 and one end of the work stage 20. Three ladder members 32a are fixed between the front support 22 and the rear support 24, and these ladder members 32a form a ladder 32 for ascending and descending between the other end of the base and the other end of the work stage 20. The upper part of the rear support 23 forms a handrail support section 23a, and the upper part of the rear support 24 forms a handrail support section 24a. Two safety handrails 33, 34 are attached between the handrail support sections 23a, 24a, and the safety handrails 33, 34 are formed of metal round pipes with a circular cross section, just like the four supports. Furthermore, a baseboard 35 is attached between the handrail posts 23a and 24a so that it can abut against the work stage 20.

In this way, the front support columns 21, 22, the rear support columns 23, 24, the work stage 20, and the safety handrails 33, 34 attached to the base 15 form the work cart body 36.

When the work platform 36 is used for loading and unloading work on the bed 38 of the truck 37, as shown in FIG. 3, the front horizontal bar 11 of the base 15 is positioned on the truck side, and the rear horizontal bar 12 is positioned away from the truck 37 relative to the front horizontal bar 11. Thus, in this specification, the front side and rear side of the loading and unloading work platform 10 are defined as the side closer to the truck 37 as the front side and the side farther from the truck 37 as the rear side, based on the state when the loading and unloading work platform 10 is positioned adjacent to the truck 37.

The upper parts of the front side pillars 21, 22, that is, the protruding parts protruding above the working stage 20, form handrail parts 21a, 22a for workers to climb up and down the ladders 31, 32. In the loading and unloading work cart 10 shown in Figures 1 and 2, the ladders 31, 32 are arranged at the ends of the working stage 20 in a direction perpendicular to the working stage 20. A worker can use either of the ladders 31, 32 to climb up and down between the ground and the working stage 20. At that time, the worker can safely climb up and down the working stage 20 by holding the handrail parts 21a, 22a of the front side pillars 21, 22 with one hand and the handrail support parts 23a, 24a of the rear side pillars 23, 24 with the other hand. In this way, the upper ends of the four pillars for supporting the working stage 20 function as safety handrails for the worker when climbing up and down.

The work cart body 36 has two front side supports 21, 22 and two rear side supports 23, 24, each of which constitutes a part of the ladder 31, 32 to which the ladder members 31a, 32a are attached. Furthermore, the upper parts of the front side supports 21, 22 function as handrail parts 21a, 22a, and the upper ends of the rear side supports 23, 24 function as handrails and are handrail support parts 23a, 24a to which the safety handrails 33, 34 are attached. In this way, the four vertical supports attached to the base 15 function as members that support the work stage 20 and as handrails, and a lightweight loading and unloading work cart 10 is obtained with a small number of parts. By moving the lightweight loading and unloading work cart 10 to the loading platform 38 of the truck 37 by the casters 18, loading and unloading work can be performed safely, and the workability of loading and unloading work can be improved.

As shown in FIG. 3, when the loading and unloading work cart 10 is placed adjacent to the loading platform 38 of the truck 37, the work stage 20 is set to be at the same height as the loading platform 38. In FIG. 3, a worker indicated by reference character P1 is working on the work stage 20, and a worker indicated by reference character P2 is working on the loading platform 38.

When loading and unloading work is to be performed, the work cart body 36 can be fixed adjacent to the truck 37 by operating the stoppers (not shown) provided on the casters 18, allowing loading and unloading work to be performed safely. When workers move between the work stage 20 and the loading platform 38 of the truck 37, they must straddle the erected gate 39, but there is no significant difference in height between the work stage 20 and the loading platform 38, allowing the workers to move safely.

The work platform body 36 is provided with a hanging frame 40. The hanging frame 40 comprises a vertical support rod 41 attached to the front support 21 and a vertical support rod 42 attached to the front support 22, and the upper ends of the two vertical support rods 41, 42 are connected by an upper end connecting rod 43. Furthermore, the lower ends of the vertical support rods 41, 42 are connected by a lower end connecting rod 44, and the hanging frame 40 is quadrilateral. These rods are made of metal round pipes with a circular cross section, and the rods are joined together by welding, so that the hanging frame 40 has sufficient strength despite its light weight.

The vertical support bar 41 is disposed inside the front support column 21, and is removably attached to the front support column 21 at the vertical center and the lower end of the vertical support bar 41 by two clamp members 45a. Similarly, the vertical support bar 42 is disposed inside the front support column 22, and is removably attached to the front support column 22 at the vertical center and the lower end of the vertical support bar 42 by two clamp members 45b. In this way, the vertical support bars 41, 42 are not shifted in the front-rear direction relative to the front support columns 21, 22, so that even if the work cart body 36 is disposed on the side of the truck 37, no gaps are generated between the front support columns 21, 22 and the side of the truck 37, and the worker can safely move between the work stage 20 and the loading platform 38. However, even if the vertical support bars 41, 42 are attached to the outside of the front support columns 21, 22, the generation of gaps can be similarly prevented. Additionally, each of the vertical support bars 41, 42 may be fixed to the front columns 21, 22 by welding.

A hook 46 is attached to each of the vertical support bars 41, 42 by a clamp member 47. The hook 46 has a horizontal portion 46a that protrudes toward the front of the loading and unloading work cart 10 and a vertical portion 46b that protrudes downward from its tip, and the hook 46 can be hooked onto the flap 39 of the truck 37. By hooking the hook 46 onto the flap 39, the loading and unloading work cart 10 is prevented from accidentally leaving the truck 37. The hook 46 can be moved up and down by loosening the clamp member 47. The hook 46 can be engaged with the flap 39 by moving the hook 46 downward from the position shown in FIG. 3. However, the hook 46 may also be attached to the front side supports 21, 22.

A hanging bracket 51 is attached to the upper end of each of the vertical support rods 41, 42, and a safety block 52 is attached to each hanging bracket 51 as shown in FIG. 2. The safety block 52 is also called a safety block, and a wire rope 54 is wound inside a housing 53, and a mounting bracket 55 is attached to the end of the wire rope 54, which is attached to the worker's belt. When the wire rope 54 is slowly unwound from the safety block 52, the wire rope 54 is unwound with little resistance, and when the worker moves in a direction approaching the safety block 52, the wire rope 54 is automatically wound. In contrast, when the wire rope 54 is rapidly unwound, the wire rope 54 is locked. As a result, if the worker falls from the work stage 20, the wire rope 54 is locked and the safety of the worker is ensured.

As shown in FIG. 2, when two safety blocks 52 are attached to the hanging frame 40, a safety rope, i.e., a wire rope 54, can be attached to the waist belt of the worker P1 on the work stage 20, and as shown in FIG. 3, the wire rope 54 can be attached to the waist belt of the worker P2 working on the loading platform 38 of the truck 37. In this way, by using the hanging frame 40, when the worker P1 runs on the work stage 20 to perform work and transfers the load between the worker P1 and the worker P2 on the loading platform 38 of the truck 37, the worker P1 on the work stage 20 can work efficiently without worrying about falling. Moreover, the worker P2 on the loading platform 38 can also work safely. However, it is also possible to attach one safety block 52 to the hanging frame 40 and attach the wire rope only to the worker P1 on the work stage 20.

Figure 4 is a rear view of a loading and unloading work platform for trucks, which is another embodiment, and Figure 5 is a side view showing the loading and unloading work platform shown in Figure 4 placed on the bed of a truck and in operation.

The work cart body 36 shown in Figures 4 and 5 is similar to the loading and unloading work cart described above, and has front side supports 21, 22 and rear side supports 23, 24 attached to the base 15, and the work stage 20 is disposed above the base 15 on the four supports. The parts of the front side supports 21, 2 above the work stage 20 form handrail sections 21a, 22a, and the parts of the rear side supports 23, 24 above the work stage 20 form handrail support sections 23a, 24a.

The loading and unloading work cart 10 shown in Figures 4 and 5 differs from the loading and unloading work cart 10 described above in that a suspension frame 40 is attached to the rear side of the work cart body 36. The suspension frame 40 has two vertical support bars 41, 42 attached to the safety handrail 33 and the work stage 20, and an upper end connecting bar 43 that connects their upper ends, and is gate-shaped. In this type of loading and unloading work cart 10, the vertical support bars 41, 42 may also be welded to the work cart body 36.

The length of the upper end connecting rod 43 of the hanging frame 40 is set shorter than that of the upper end connecting rod 43 shown in Fig. 1, and the strength of the hanging frame 40 can be maintained without providing the lower end connecting rod 44 shown in Fig. 1. However, each of the vertical support rods 41, 42 can also be attached to the rear side supports 23, 24, and in that case, it is preferable to provide the lower end connecting rod 44 in order to increase the strength of the hanging frame 40. The upper ends of the two vertical support rods 41, 42 constituting the hanging frame 40 are provided with a curved portion 48 that curves toward the top of the loading platform 38 of the truck 37. When two safety blocks 52 are attached to this hanging frame 40 as shown in Fig. 4, a wire rope 54 can be attached to the worker P1 on the working stage 20 and the worker P2 on the loading platform 38 as shown in Fig. 5. However, it is also possible to attach one safety block 52 to the suspension frame 40 and attach a wire rope only to the worker P1 on the working stage 20.

In the loading and unloading work platform 10 shown in FIG. 5, the hook 46 is attached to the front support columns 21, 22 so that it can move up and down freely, and in FIG. 5, the hook 46 is shown engaged with the gate plate 39 of the truck 37.

Figure 6 is a side view showing a modified example of the running wheels 17 provided on the work cart body 36. Sliding members 56 are provided inside the support leg member 16 at the front and rear of the support leg member 16, and the bases 19 of the casters 18 having the running wheels 17 are attached to the sliding members 56. By moving the sliding members 56 in the front-rear direction as shown by the arrow, the front-rear position of the running wheels 17 can be changed. This makes it possible to increase the stability of the work cart body 36 by increasing the distance between the front and rear running wheels 17 depending on where the work cart body 36 is used.

The work cart body 36 is rectangular in plan view, with ladders 31, 32 provided at both ends of the rectangle. When two work cart bodies 36 are butted together at their ends, the two work cart bodies 36 can be positioned along the bed of a truck. This allows multiple workers to work on the work stage 20.

The present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the spirit of the invention.

10 Loading and unloading work cart for trucks 11 Front horizontal bar 12 Rear horizontal bar 15 Base 16 Support leg member 17 Traveling wheels 18 Casters 20 Work stage 21, 22 Front support pillars 23, 24 Rear support pillars 26 Expanded metal 31, 32 Ladder 33, 34 Safety handrail 36 Work cart body 37 Truck 38 Loading platform 39 Gate 40 Suspension frame body 41, 42 Vertical support bar 43 Upper end connecting bar 44 Lower end connecting bar 46 Hook 48 Curved portion,
51 Hanging bracket 52 Safety block 54 Wire rope

Claims (5)

A loading and unloading work platform for a truck that is disposed adjacent to the bed of the truck and is used when performing loading and unloading work on the truck,
A base having a front horizontal bar on the track side and a rear horizontal bar extending parallel to the front horizontal bar, and on which running wheels are provided;
a work stage fixed to vertical front side supports attached to both ends of the front side horizontal bar and vertical rear side supports attached to both ends of the rear side horizontal bar and disposed above the base;
A safety handrail attached to a handrail support portion formed by a portion of the rear support column that is above the work stage;
A work platform body including a ladder attached between the front support column and the rear support column, and a worker climbing up and down between the work stage and the ground,
a suspension frame including two vertical support rods protruding above the working stage and attached to the work platform body, and an upper end connecting rod attached to upper ends of the vertical support rods;
A loading and unloading work platform for trucks is provided with a safety block attached to the suspension frame around which a wire rope worn by a worker is wound. 2. The loading and unloading work platform for trucks according to claim 1,
A loading and unloading work platform for trucks, in which the vertical support rod is attached to the front support pillar and the lower ends of the two vertical support rods are connected by a lower end connecting rod. 3. The loading and unloading work platform for trucks according to claim 2,
The vertical support bar is provided with a hook for engaging with the tailgate of the truck. 2. The loading and unloading work platform for trucks according to claim 1,
A loading and unloading work platform for trucks, in which the vertical support bar is attached to the safety handrail and a curved portion is provided at the upper portion of the vertical support bar that curves toward the top of the truck bed. A loading and unloading work platform for trucks according to claim 4, in which a handrail formed by a portion of the front support pillar above the work stage is provided with a hook that engages with the tailgate of the truck.

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