Loading platform ladder

Abstract

Use it in a stable state without damaging the track. 【Solution means】A frame 2 composed of a pair of side members 4 arranged side by side and a connecting member 5 connecting the side members 4, and a tread bar 3 attached to the frame 2 and rotatable between a folded position along the side member 4 and a forward position intersecting the side member 4. The frame 2 is provided with hooks 7 that can be locked to the attachment part. The hook 7 includes a first vertical part 8 along the side member 4, a horizontal part 9 extending horizontally rearward from the upper end part of the first vertical part 8, and a second vertical part 10 extending downward from the tip part of the horizontal Part A loading platform ladder 1 is provided, in which a first first elastic member 13 is attached to the inner surfaces of the first vertical part 8, the horizontal part 9 and the second vertical part 10.

Description

Technical Field

[0001] The present invention relates to a loading platform ladder that is used by locking onto an awning or the like when ascending and descending to the loading platform of a truck.

Background Art

[0002] Conventionally, there is a loading platform ladder disclosed in Patent Document 1. This loading platform ladder includes a frame and a plurality of treads, and has a hook that can be hooked onto a truck.

[0003] However, in the above loading platform ladder, the hook is made of metal, and when locking onto an awning or the like provided on the loading platform, there is a risk of damaging the awning or the like. There is also a concern that the locking state may become unstable, such as the hook slipping sideways.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] An object of the present invention is to provide a loading platform ladder that can be used in a stable state without damaging the truck.

Means for Solving the Problems

[0006] In order to solve the above problems, the present invention provides a loading platform ladder comprising a frame composed of a pair of side members arranged side by side and a connecting member connecting the side members, and a tread bar rotatably attached to the frame and rotatable between a folding position along the side members and a front position intersecting the side members. The frame is provided with hooks that can be locked to the mounting portion. Each hook includes a first vertical portion along the side member, a horizontal portion extending horizontally rearward from the upper end portion of the first vertical portion, and a second vertical portion extending downward from the tip portion of the horizontal portion. A first elastic member is attached to the inner surfaces of the first vertical portion, the horizontal portion, and the second vertical portion.

[0007] According to this configuration, when attaching and detaching the hook to the mounting portion, since the elastic member is interposed, there is no risk of the hook directly contacting the mounting portion and damaging it. Further, due to the action of the elastic member, there is no concern about misalignment such as the hook, that is, the loading platform ladder shifting laterally, and it can be raised and lowered in a stable state.

[0008] Preferably, a second elastic member is attached to the outer surface of the second vertical portion of the hook.

[0009] According to this configuration, the possibility of damaging the mounting portion or the like by the hook can be further reduced.

[0010] Preferably, a third elastic member is attached to the same position at the rear portion of each side member.

[0011] According to this configuration, it is possible to prevent the side member from contacting and damaging the mounting portion or the like during ascending and descending. Also, together with the elastic member provided on the hook, it is possible to more effectively prevent the misalignment of the loading platform ladder.

[0012] Preferably, the third elastic member is detachable and the mounting position in the longitudinal direction with respect to the side member can be changed.

[0013] According to this configuration, the third elastic member can be attached to an appropriate position where the effect can be exerted according to differences such as the size of the attached part.

[0014] The tread bar is preferably attached so that its rotatability can be adjusted.

[0015] According to this configuration, the rotational position of the tread bar, particularly the state at the folded position and the forward position, can be stabilized. As a result, it is possible to prevent the tread bar from rotating during carrying or ascending / descending, and to make the configuration convenient for handling.

[0016] The tread bar includes a frame portion and a tread surface portion that connects both side portions of the frame portion, and the upper surface of the tread surface portion is preferably provided below the upper surface of the frame portion and has a plurality of ridges in the longitudinal direction.

[0017] According to this configuration, it is possible to prevent the foot placed during ascending / descending from slipping, and it becomes possible to use it with confidence.

[0018] The hook preferably has a reinforcing structure for increasing the attachment strength to the frame.

[0019] According to this configuration, the portion where the most force is applied during use is made strong, and it becomes possible to use it over a long period of time.

[0020] The frame and the tread bar are preferably made of an aluminum alloy and formed in a cylindrical shape.

[0021] According to this configuration, it becomes lightweight and convenient for handling, particularly for carrying.

Effects of the Invention

[0022] According to the present invention, since the elastic member is attached to the hook, the risk of damaging the attached part or the like can be reduced. In addition, it is possible to suppress the occurrence of positional displacement such as lateral displacement during use, and to ascend and descend in a stable state.

Brief Description of the Drawings

[0023] The drawings show specific embodiments of the invention according to the present disclosure, including not only the essential components of the invention but also optional and preferred embodiments.

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Modes for Carrying Out the Invention

[0024] Hereinafter, embodiments according to the present invention will be described with reference to the accompanying drawings. In the following description, terms indicating specific directions and positions (for example, terms including "up", "down", "side", "end") are used as necessary, but the use of these terms is for facilitating the understanding of the invention with reference to the drawings, and the technical scope of the present invention is not limited by the meanings of these terms. Further, the following description is merely illustrative in nature and is not intended to limit the present invention, its applications, or its uses.

[0025] FIGS. 1 to 3 are perspective views of a loading platform ladder 1 according to this embodiment. This loading platform ladder 1 is made of an aluminum alloy and includes a frame 2 and rungs 3 rotatably attached to the frame 2.

[0026] Frame 2 consists of side members 4 and connecting members 5. The side member 4 is a hollow bar formed with a rectangular cross-section, and the upper and lower openings are closed by rubber covers 6. Similarly, the connecting member 5 is also a hollow bar formed with a rectangular cross-section, and connects the side members 4 arranged in parallel at predetermined intervals at the upper and lower ends and the middle part. Here, the side member 4 and the connecting member 5 are integrated by welding.

[0027] A hook 7 is attached to the rear side of the upper end of the side member 4, that is, the back surface of the upper end. As shown in FIGS. 4 and 5, the hook 7 is composed of a U-shaped part 11 consisting of a first vertical part 8, a horizontal part 9, and a second vertical part 10, and a reinforcing part 12 provided on the horizontal part 9. The first vertical part 8 is integrated with the side member 4 by welding. The lower end of the second vertical part 10 protrudes in a triangular shape in plan view. A rubber first elastic member 13 is attached to the inner surface of the U-shaped part 11 by adhesion or the like. In the state where the first elastic member 13 is attached, the gap dimension between the first vertical part 8 and the second vertical part 10 is set to 5.3 cm here, which is slightly larger than the width dimension of the upper end part of the front fender 25 of a large truck. Thus, if the hook 7 is of a size smaller than a large truck, it can be locked to any front fender 25. (Of course, this gap dimension can be changed according to the size of the front fender 25 of the truck to be used.) Also, a similar rubber second elastic member 14 is attached to the outer surface of the second vertical part 10 by adhesion or the like. The reinforcing part 12 consists of a reinforcing vertical part 15 continuous with the first vertical part 8 formed to form a right-angled triangle in cross-section with the horizontal part 9, an inclined part 16 extending obliquely from the upper end thereof and continuous with the second vertical part 10, and a connecting part 17 connecting the inclined part 16 and the horizontal part 9. The reinforcing vertical part 15 is integrated with the side member 4 by welding together with the first vertical part 8. Due to the reinforcing part 12, even if a person rides on the footrest 3 and a load acts when the U-shaped part 11 is locked to the front fender 25 of the truck or the like, a stable support state can be obtained without deformation.

[0028] On the lower side rear surface of the connecting portion of the connecting member 5 that connects the middle portions of the side members 4, specifically the middle portions of the side members 4, a first mounting hole (not shown) is formed, and a second mounting hole 4a is formed on the upper side rear surface near the connecting portion. A third elastic member 18 made of rubber is removably attached to each mounting hole, and here, the third elastic member 18 is attached to the first mounting hole. The mounting position of the third elastic member 18 can be changed according to the difference in the size of the truck to which the loading platform ladder 1 is attached. As shown in FIG. 6, the third elastic member 18 includes a shaft portion (not shown) that is press-fitted into the first mounting hole or the second mounting hole 4a, and an elastic receiving portion 19 provided at the tip of the shaft portion. The elastic receiving portion 19 has an annular groove portion 19a formed along the outer peripheral edge on the end face. This makes it possible to effectively prevent displacement when contacting the surface of the aori 25 or the like.

[0029] As shown in Fig. 1, the tread bar 3 is composed of a first tread bar 3a provided at the lower end of the side member 4 and a second tread bar 3b provided at the middle part of the side member 4. Each tread bar 3 includes a substantially U-shaped frame portion 20 and a tread surface portion 21 connecting both side portions thereof. Both the frame portion 20 and the tread surface portion 21 are hollow with a rectangular cross-section. The frame portion 20 is rotatably supported by support portions 22 having both ends fixed to the side member 4, and both side portions and the middle portion are connected by arc portions. The support portion 22 has a fixing portion fixed to the side member 4 by welding and a guide portion protruding from the fixing portion. Through holes are respectively formed in the opposing walls of the guide portion. The shaft portion of the bolt 23 is inserted through the through hole in one opposing wall, and the shaft portion protrudes from the through hole in the other opposing wall through the through holes formed at both ends of the frame portion 20, and a nut 24 is screwed thereon. Thus, the tread bar 3 is rotatably supported about the shaft portion of the bolt 23 between a forward position where both side portions (bottom surfaces on the rotation center side) of the tread bar 3 abut against the bottom wall of the guide portion and a folded position where the arc portion abuts against the front surface of the side member 4. Here, the tread bar 3 located at the forward position is orthogonal to the side member 4. And it is possible to adjust the rotational mobility of the tread bar 3, that is, the ease of rotation, by the tightening degree of the bolt 23 and the nut 24. One tread surface portion 21 is provided for the first tread bar, and two tread surface portions 21 are provided for the second tread bar. At the protruding position, the first tread bar protrudes further forward than the second tread bar. In a state where the tread bar 3 is positioned at the forward position, the upper surface of the tread surface portion 21 is located below the upper surface of the frame portion 20 and is in a state of being recessed from the frame portion 20. Further, a plurality of protrusions (not shown) are formed on the upper surface of the tread surface portion 21 along the longitudinal direction, and the width direction has an uneven shape.

[0030] Next, a method of using the loading platform ladder 1 having the above configuration will be described.

[0031] Before use, the tread bar 3 is rotated to the folded position along the side member 4. This makes it compact and convenient to carry.

[0032] When in use, the tread bar 3 is rotated from the folded position to the protruding position. Then, the hook 7 is locked to the octopus 25 for use. The octopus 25 can be used in either the upright position shown in Fig. 7 with the octopus 25 standing upright or the overturned position shown in Fig. 8 with the octopus 25 lying down. In Fig. 7, the hook 7 is locked to the upper edge of the octopus 25, and in Fig. 8, the hook 7 is locked to the lower edge of the octopus 25. In the case of Fig. 8, it is necessary to insert the second vertical portion 10 of the hook 7 into the gap between the octopus 25 and the side edge of the loading platform. However, a second elastic member 14 is provided on the outer surface of the second vertical portion 10. Therefore, the loading platform or the like will not be damaged. Also, the lower end of the second vertical portion 10 is formed in a triangular shape in plan view. Therefore, it is easy to insert the second vertical portion 10 into the gap between the octopus 25 and the side edge of the loading platform. And in any case, since the first elastic member 13 is provided on the inner surface of the hook 7, neither the upper edge nor the lower edge of the octopus 25 will be damaged. Moreover, since the interval between the hooks 7 is sufficiently wide, it can be smoothly and easily attached to either the upper edge or the lower edge of the octopus 25.

[0033] If the loading platform ladder 1 is locked to the upper edge of the octopus 25 in the upright position shown in Fig. 7, first place your foot on the first tread bar and ascend to the loading platform. At this time, the first elastic member 13 of the hook 7 presses against the upper edge of the octopus 25, increasing the frictional resistance and preventing displacement. Also, the third elastic member 18 presses against the side of the octopus 25, increasing the frictional resistance and preventing displacement at this position as well. Also, on the first tread bar 3a, the foot is placed on the frame portion 20 and the slightly lower tread surface portion 21 surrounded by the frame portion 20. Moreover, a plurality of ridges are formed on the tread surface portion 21, making it uneven. Therefore, the foot is less likely to be displaced from the tread bar 3, and the loading platform ladder 1 can be ascended in a stable state. Also, the second tread bar 3b protrudes less forward than the first tread bar 3a. Therefore, the foot can be smoothly moved from the first tread bar 3a to the second tread bar 3b.

[0034] Thus, according to the loading platform ladder 1 having the above configuration, the following effects are achieved. (1) Since the first elastic member 13 and the second elastic member 14 are provided on the hook 7, each part of the loading platform such as the octopus 25 will not be damaged. (2) When the hook 7 of the loading platform ladder 1 is locked to the octopus 25, the first elastic member 13 is in pressure contact with the upper edge or the lower edge of the octopus 25, and the third elastic member 18 is in pressure contact with the side surface of the octopus 25. Therefore, the loading platform ladder 1 is not likely to be displaced. For this reason, it can be ascended and descended in a stable state. Further, by changing the position of the third elastic member 18, it can be used at an appropriate position according to the form of the place of use. (3) Since the loading platform ladder 1 is formed of an aluminum alloy and has a hollow structure, it is lightweight, convenient to carry, easy to handle, and moreover, strong. (4) The tread bar 3 is composed of a frame portion 20 and a tread surface portion 21 recessed inside thereof, and a plurality of ridges are formed on the upper surface of the tread surface portion 21. Therefore, it is possible to prevent the placed foot from slipping and to ascend and descend the loading platform ladder 1 in a stable state. (5) Since the support state of the tread bar 3 can be adjusted by changing the tightening degree of the bolt 23 and the nut 24 and the rotational mobility can be adjusted, the stationary states at the protruding position and the folded position can be stabilized.

[0035] Note that the present invention is not limited to the configuration described in the above embodiment, and various modifications are possible.

[0036] In the above embodiment, the loading platform ladder 1 is made of an aluminum alloy, but it may be made of other metals such as stainless steel or other lightweight and strong materials such as synthetic resin.

[0037] In the above embodiment, three connecting members 5 are provided, but two or four or more connecting members may be provided according to the length of the side member 4.

[0038] In the above embodiment, two tread bars 3 are provided, but one or three or more tread bars may be provided according to the length of the side member 4.

[0039] In the above-described embodiment, the third elastic member 18 can be attached at two locations, but it is also possible to have three or more locations depending on the length of the side member 4. Further, although it is attached to the side member 4, it may be attached to the connecting member 5, and the number and location can be freely set.

[0040] In the above-described embodiment, the tread surface portion 21 of the tread bar 3 is one, but it may be two or more. However, in order to be lightweight, it is preferably one.

Explanation of Reference Numerals

[0041] 1... Loading platform ladder 2... Frame 3... Tread bar 4... Side member 5... Connecting member 6... Cover 7... Hook 8... First vertical portion 9... Horizontal portion 10... Second vertical portion 11... U-shaped portion 12... Reinforcing portion 13... First elastic member 14... Second elastic member 15... Reinforcing vertical portion 16... Inclined portion 17... Connecting portion 18... Third elastic member 19... Elastic receiving portion 20... Frame portion 21... Tread surface 22... Support portion 23... Bolt 24... Nut 25... Octopus

Claims

1. A frame including a pair of side members arranged side by side and a connecting member connecting the side members; a tread attached to the frame and rotatable between a folded position along the side member and a forward position intersecting the side member; Equipped with The frame includes a hook that can be engaged with the mounting portion, The hook includes a first vertical portion that is aligned with the side member, a horizontal portion that extends horizontally rearward from an upper end portion of the first vertical portion, and a second vertical portion that extends downward from a tip end portion of the horizontal portion, A loading platform ladder, comprising a first elastic member attached to the inner surfaces of the first vertical portion, the horizontal portion and the second vertical portion.

2. 2. The platform ladder of claim 1, wherein the hook has a second resilient member attached to an outer surface of the second vertical portion.

3. 3. A platform ladder as claimed in claim 1 or 2, wherein each of the side members has a third elastic member attached to the same position on the rear portion.

4. 4. The loading platform ladder according to claim 3, wherein the third elastic member is detachable and its longitudinal attachment position relative to the side member is changeable.

5. 2. The platform ladder according to claim 1, wherein the rungs are mounted so as to be adjustable in rotation.

6. The tread bar includes a frame portion and a tread portion connecting both side portions of the frame portion, The loading platform ladder according to claim 5, wherein the upper surface of the tread portion is located lower than the upper surface of the frame portion and has a plurality of protrusions in the longitudinal direction.

7. 2. The loading platform ladder according to claim 1, wherein the hook has a reinforcing structure for increasing the strength of attachment to the frame.

8. 2. The platform ladder according to claim 1, wherein the frame and the rungs are made of an aluminum alloy and formed into a cylindrical shape.

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