Ladder for truck loading platform

Abstract

To provide a ladder for truck loading platforms that can reliably prevent forgetting to remove the ladder from the truck and ensure high safety.SOLUTION: A ladder (1) for a truck loading platform consists of a ladder (2) provided detachably for a loading platform (31) of the truck (30) and a pair of wheel stopper blocks (4, 4) provided on either side of a tire (32) of the truck (30). The pair of wheel stopper blocks (4, 4) are provided in a state where separation is regulated with respect to the ladder (2).SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a ladder that can be detachably mounted on the bed of a truck. [Background technology]

[0002] When loading or unloading a load onto or from the bed of a truck, or when work needs to be done on the bed, a worker climbs onto the bed. In many trucks, a simple scaffold is fixedly installed below the bed, and a worker can climb onto the bed by putting his / her feet on it. However, the scaffold is simple and not necessarily safe. In response to such scaffolding, various detachable ladders have been proposed, for example as described in Patent Document 1. The ladder can be attached to the bed when necessary, and a worker can safely climb onto and descend from the bed. The ladder is detached when the truck is traveling, and stored in the bed for transport.

[0003] When trucks are parked and working, tire chocks, or wheel chocks, are attached to the tires to ensure safety and prevent the truck from moving unintentionally. Wheel chocks include those with a shape such as that proposed in Patent Document 2, but a relatively simple type consisting of a pair of wheel chock blocks is widely used. The pair of wheel chock blocks are attached to the left and right of the tire to prevent the tire from rotating. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Utility Model Registration No. 3205852 [Patent Document 2] JP 2020-185932 A Summary of the Invention [Problem to be solved by the invention]

[0005] Both the ladder that can be attached and detached from the loading platform and the conventional wheel chocks are excellent in terms of ensuring safety. However, there are also issues that need to be resolved. Specifically, there is a problem regarding the danger that occurs when the ladder is forgotten to be removed. When a worker completes work on the loading platform, the ladder must be removed from the loading platform. This is because driving with the ladder attached to the loading platform causes the ladder to fall, which is dangerous. Since the ladder is installed near eye level and is relatively conspicuous, it is difficult to imagine forgetting to remove it. In other words, there is almost no danger. In contrast, the wheel chock is installed on the ground and is not conspicuous. This means that there is a risk of forgetting to remove the wheel chock. If the truck is driven in this state, the wheel chock will be thrown to the side by the tires. This poses a risk of hitting other vehicles and of interfering with the driving of other vehicles, which could lead to an accident.

[0006] The present invention aims to solve the above-mentioned problems, and specifically aims to provide a ladder for a truck bed that can reliably prevent forgetting to remove it and is highly safe. [Means for solving the problem]

[0007] In the present invention, a ladder for a truck bed is constructed from a ladder that is detachably attached to the bed of the truck and a pair of wheel stopper blocks that are provided on the left and right sides of the tires of the truck. The pair of wheel stopper blocks are attached to the ladder in a state in which they are restricted from separating from the ladder. Effect of the Invention

[0008] According to the present invention, the ladder for a truck bed is composed of a ladder and a pair of wheel stopper blocks, and the pair of wheel stopper blocks are attached to the ladder in a state in which separation is restricted. Therefore, when the ladder is attached to the bed, it is attached near the tire, and the pair of wheel stopper blocks are installed on the left and right sides of the tire. In this way, the ladder allows safe boarding and disembarking from the bed, and the pair of wheel stopper blocks allows the truck to be safely stopped. Then, when the ladder is no longer in use and the ladder is removed from the bed, the pair of wheel stopper blocks can be inevitably noticed. This is because the pair of wheel stopper blocks are attached to the ladder in a state in which separation is restricted. Therefore, the pair of wheel stopper blocks can also be removed reliably. [Brief description of the drawings]

[0009] [Figure 1] 1 is a perspective view of a truck bed ladder according to an embodiment of the present invention; [Figure 2A] 1 is a front view showing a portion of a truck including a bed and a truck bed ladder according to an embodiment of the present invention. [Figure 2B] 1 is a front view showing a portion of a truck including a bed and a truck bed ladder according to an embodiment of the present invention. [Figure 2C] 1 is a front view showing a portion of a truck including a bed and a truck bed ladder according to an embodiment of the present invention. [Figure 2D] 1 is a front view showing a portion of a truck including a bed and a truck bed ladder according to an embodiment of the present invention. [Figure 2E] 1 is a front view showing a portion of a truck including a bed and a truck bed ladder according to an embodiment of the present invention. [Diagram 3] FIG. 11 is a perspective view of a truck bed ladder according to a modified example of the present embodiment. [Figure 4] FIG. 11 is a perspective view of a truck bed ladder according to another modified example of the present embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] <Truck bed ladder according to the present embodiment> The following is a description of an embodiment of the present invention. As shown in Fig. 1, a truck bed ladder 1 according to this embodiment is generally composed of a ladder 2 and a pair of wheel stopper blocks 4, 4 provided on the ladder 2.

[0011] The ladder 2 is roughly composed of left and right support posts 6, 6 and step boards 7, 7 fixed to these support posts 6, 6. In this embodiment, the support posts 6, 6 are formed from metal square pipes and are open at the top. Handrails 9, 9, which will be described next, are inserted into this opening. Hook portions 10, 10 are fixed to the upper ends of the support posts 6, 6 by welding so that the ladder can be hooked onto the bed of a truck. Handles 11 are provided on the tops of the left and right support posts 6, 6 to make the truck bed ladder 1 easy to carry.

[0012] The handrails 9, 9 are formed from rod material of a predetermined length and, as described above, are inserted into the posts 6, 6 so as to be able to slide freely. Enlarged diameter sections 13, 13 are formed at the upper ends of the handrails 9, 9 to prevent the handrails 9, 9 from falling completely into the posts 6, 6 when they slide downward. Three-lobe knob bolts 14, 14, ..., i.e. handrail fixing means, are provided on the posts 6, 6, and their tips reach into the posts 6, 6. The handrails 9, 9 can be fixed by sliding them to the desired sliding position and tightening the three-lobe knob bolts 14, 14, ....

[0013] The pair of wheel stopper blocks 4, 4 are provided on a pair of support members 15, 15. The support members 15, 15 are made of metal rod material and are formed as follows by bending or welding. That is, the support members 15, 15 are formed of straight rod-shaped portions 16, 16, lateral protrusions 18, 18 formed laterally from the lower ends of the rod-shaped portions 16, 16, and handle portions 19, 19 formed at a right angle from the upper ends of the rod-shaped portions 16, 16. The pair of wheel stopper blocks 4, 4 are fixed to the lateral protrusions 18, 18.

[0014] The support members 15 and the pair of wheel stopper blocks 4 are attached to the ladder 2 as follows. A pair of metal round pipes 21 of a predetermined length are fixed to the pair of support posts 6. The rod-shaped parts 16 of the support members 15 are inserted into the metal round pipes 21. The support members 15 are slidable up and down relative to the support posts 6 within a range in which the rod-shaped parts 16 can slide relative to the metal round pipes 21, and are prevented from being removed by the side projections 18 and the handle parts 19. In other words, the pair of wheel stopper blocks 4 are attached to the ladder 2 in a state in which separation is restricted. When the support members 15 are rotated by holding the handle parts 19, the side projections 18 and the wheel stopper blocks 4 rotate. In other words, the wheel stopper blocks 4 can be moved to a desired position by operating the handle parts 19.

[0015] <How to install a truck bed ladder> A method of attaching the truck bed ladder 1 according to this embodiment to the bed of a truck will be described. As shown in FIG. 2A, the truck bed ladder 1 is brought close to the bed 31 near the rear tire 32 of the truck 30. The truck bed ladder 1 can be easily brought close to the bed 31 by holding the handle 11. The posts 6, 6 are provided with hook portions 10, 10 as shown in FIG. 1. These hook portions 10, 10 are hooked onto the upper end of the bed 31. Then, as shown in FIG. 2B, the ladder 2 of the truck bed ladder 1 can be attached to the bed 31.

[0016] As shown in Fig. 2C, the support members 15, 15 are slid downward to move the pair of wheel stop blocks 4, 4 to the ground level. At this time, the height of the wheel stop blocks 4, 4 can be easily adjusted by operating the handle portions 19, 19 of the support members 15, 15. Next, as shown in Fig. 2D, the handle portions 19, 19 are rotated. This rotates the support members 15, 15 and the pair of wheel stop blocks 4, 4, and the pair of wheel stop blocks 4, 4 are positioned on the left and right of the rear tire 32. This makes it possible to prevent the tire 32 from rotating.

[0017] As shown in FIG. 2E, the handrail fixing means, i.e., the three-lobe knob bolts 14, 14, are loosened, and the handrails 9, 9 are pulled out from the posts 6, 6. After the handrails 9, 9 are pulled out to the desired sliding position, the three-lobe knob bolts 14, 14 are tightened. The handrails 9, 9 are fixed. The installation of the truck bed ladder 1 according to this embodiment to the bed 31 of the truck 30 is completed. When removing the truck bed ladder 1 from the bed 31, the above-described series of operations can be carried out in reverse order. The pair of wheel stopper blocks 4, 4 cannot be separated from the ladder 2, so there is no risk of forgetting to remove the pair of wheel stopper blocks 4, 4 when removing the truck bed ladder 1 from the bed 31.

[0018] <Modification> The truck bed ladder 1 according to the present embodiment can be modified in various ways. FIG. 3 shows a truck bed ladder 1A according to a modified embodiment of the present embodiment. The same reference numbers are used for the same members as those of the truck bed ladder 1 according to the present embodiment (see FIG. 1), and the description thereof is omitted. The truck bed ladder 1A according to the modified embodiment is also roughly composed of a ladder 2A and a pair of wheel stopper blocks 4, 4. The ladder 2A has left and right pillars 6A, 6A formed longer, and the hook parts 10, 10 are provided at the middle position of the pillars 6A, 6A. The part above the hook parts 10, 10 is a handrail 9A, 9A. In the modified embodiment, the pair of wheel stopper blocks 4, 4 are connected to ropes 41, 41, and the ends of the ropes 41, 41 are fixed to fasteners 42, 42 provided on the pillars 6A, 6A of the ladder 2A. In other words, the modified truck bed ladder 1A also has a pair of wheel stopper blocks 4, 4 that are provided in a state in which separation from the ladder 2A is restricted. Therefore, when removing the modified truck bed ladder 1A from the bed 31 of the truck 30 (see FIG. 2A), there is no risk of forgetting to remove the pair of wheel stopper blocks 4, 4 from the tire 32.

[0019] The truck bed ladder 1 according to the present embodiment can be modified in other ways. For example, the ladder 2 may be modified so that a pair of wheel stop blocks 4 can be fixed to the metal fittings by providing the posts 6, 6 and the treads 7, 7 of the ladder 2 with predetermined metal fittings. FIG. 4A shows a part of a truck bed ladder 1B according to another embodiment of the present invention, which is a modification of the truck bed ladder 1 according to the present embodiment. In this truck bed ladder 1B, a metal fitting base 45 and a metal fitting 46 fixed to the metal fitting base 45 are provided near the support member 15 supporting the wheel stop block 4 on the lowest step 7 of the ladder 2. Although not shown in FIG. 4A, a similar metal fitting base 45 and metal fitting 46 are also provided near the support member 15 supporting the other wheel stop block 4. In FIG. 4A, when the support member 15 is rotated 90 degrees in the direction of the arrow 47, the wheel stop block 4 is positioned outside the support. In this state, the wheel stop block 4 is pulled up by the support member 15. Then, as shown in Fig. 4(B), it is rotated another 90 degrees in the direction of the arrow 48. Then, the lateral protrusion 18 of the support member 15 is sandwiched between the metal fitting base 45 and the metal fitting 46. Then, the wheel stop block 4 can be fixed on the tread 7. Although not shown in the figure, the other wheel stop block 4 can be fixed in the same way. When the pair of wheel stop blocks 4, 4 are fixed in this way, the pair of wheel stop blocks 4, 4 do not wobble when storing or transporting the truck bed ladder 1B, making it easy to store and transport. [Explanation of symbols]

[0020] 1 Truck bed ladder 2 Ladder 4 Wheel stopper block 6 Support post 7 Steps 9 Handrails 10 Hook part 11 Handle 13 Enlarged diameter portion 14 Three-lobe knob bolt 15 Support member 16 Rod-shaped portion 18 Side protrusion 19 Handle portion 21 Metal round pipe 30 Truck 31 Cargo bed 32 Tires 41 Rope 42 Fastener 45 Metal fittings 46 Metal fittings

Claims

1. A ladder that is detachably attached to the bed of the truck; A pair of wheel stopper blocks are provided on the left and right sides of the tire of the truck to stop the rotation of the tire, This is a truck bed ladder, in which a pair of the wheel stop blocks are provided on the ladder in a state in which separation is restricted.

2. The ladder comprises a pair of handrails and a handrail fixing means; A ladder for a truck bed as described in claim 1, wherein the pair of handrails are slidably mounted on a pair of left and right posts that constitute the ladder, and the pair of handrails are fixed to the pair of posts at any sliding position by the fixing means.

3. The truck bed ladder includes a pair of support members, A ladder for a truck bed as described in claim 1 or 2, wherein a pair of the support members have a straight rod-shaped portion and a lateral protrusion formed at the end of the rod-shaped portion, each of the rod-shaped portions being slidably and axially rotatably mounted on a pair of left and right pillars that constitute the ladder, and each of the lateral protrusions is provided with a wheel stopper block.

4. 4. A truck bed ladder as described in claim 3, wherein the rod-shaped portions of the pair of support members are provided with handle portions, and the support members are slid relative to the posts or rotated about their axes by holding the handle portions.

5. 4. A truck bed ladder as described in claim 3, wherein the ladder is provided with a pair of metal fittings, and when the lateral protrusions of the pair of support members are fixed to the pair of metal fittings, the pair of wheel stop blocks are fixed.

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