Lifting aid

Abstract

To provide a lifting aid that can be easily and securely fixed. [Solution] A lifting assist device 1 fixed to the upper end of the side wall 2 of the bucket of a high-altitude work vehicle, the lifting assist device 1 comprises a holding member 3, a handrail member 4 fixed to the holding member 3, and a clamp member 5, the holding member 3 having a horizontal portion 3a extending horizontally across the side wall, an outer vertical portion 3b facing the surface of the side wall 2 on the outside of the bucket, and an inner vertical portion 3c facing the surface of the side wall 2 on the inside of the bucket, the clamp member 5 being held by the holding member 3 so as to be able to adjust the horizontal distance with the inner vertical portion 3c and the vertical distance with the horizontal portion 3a between the inner vertical portion 3c and the outer vertical portion 3b, the edge 2a protruding horizontally outward from the upper end of the side wall 2 is clamped vertically by the horizontal portion 3a and the clamp member 5, and the side wall 2 is fixed to the side wall 2 by being clamped horizontally by the inner vertical portion 3c and the clamp member 5.

Description

[Technical Field]

[0001] The present invention relates to a lifting aid. [Background Art]

[0002] A lifting aid that is fixed to a work vehicle and includes a handrail member is known (see, for example, Patent Document 1). [Prior Art Documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Unexamined Patent Publication No. 2010-7364 [Summary of the Invention] [Problem to be Solved by the Invention]

[0004] It is preferable that a lifting aid can be easily fixed to a work vehicle and has high fixing strength.

[0005] Therefore, an object of the present invention is to provide a lifting aid that can be fixed easily with high strength. [Means for Solving the Problem]

[0006] One aspect of the present invention is as follows.

[0007] [1] A lifting aid fixed to an upper end portion of a side wall of a bucket of an aerial work vehicle, The lifting aid includes a holding member, a handrail member fixed to the holding member, and a clamp member, The holding member has: a horizontal portion extending across the side wall in a horizontal direction; an outer vertical portion facing a surface of the side wall outside the bucket; and an inner vertical portion facing a surface of the side wall inside the bucket, The clamp member is held by the holding member so as to be able to adjust the horizontal distance to the inner vertical portion and the vertical distance to the horizontal portion between the inner vertical portion and the outer vertical portion, A lifting assist device in which an edge protruding horizontally outward from the upper end of the side wall is clamped vertically by the horizontal portion and the clamping member, and the side wall is fixed to the side wall by being clamped horizontally by the inner vertical portion and the clamping member.

[0008] [2] The clamp member is held on the outer vertical portion so as to be movable horizontally relative to the holding member, The lifting assist device according to [1], wherein the clamp member comprises a movable member that can move vertically, and the vertical distance from the horizontal portion can be adjusted by moving the movable member vertically.

[0009] [3] The handrail member has one end and the other end fixed to the holding member, and includes a first straight section and a second straight section extending vertically, and a gripping section between the first straight section and the second straight section. The lifting aid according to [1] or [2], wherein at one end and the other end, the handrail member extends horizontally and is fixed vertically to the outer vertical portion.

[0010] [4] The handrail member comprises a first straight section, a second straight section, and a gripping section, which are U-shaped, and the plane forming the U-shape faces the side wall, as described in [1] to [3].

[0011] [5] The outer vertical portion has an insertion hole at one end that extends horizontally and an insertion hole at the other end that extends horizontally. The aforementioned one end is inserted into the aforementioned one-end insertion hole and fixed to the aforementioned outer vertical portion. The other end is inserted into the other end insertion hole and fixed to the outer vertical portion, as described in [1] to [4].

[0012] [6] In the outer vertical portion, the position at which said one end is fixed and the position at which said other end is fixed differ from each other in vertical direction position and horizontal direction position, respectively. The lifting assisting tool according to any one of [1] to [5].

Effect of the Invention

[0013] According to the lifting assisting tool of the present invention, it can be easily fixed to a bucket of a work vehicle with high strength.

Brief Description of Drawings

[0014] [Figure 1] It is an overall view showing a state before the lifting assisting tool according to one embodiment of the present invention is fixed to a side wall. [Figure 2] It is a view showing a state where the lifting assisting tool according to one embodiment of the present invention is fixed to a side wall of a bucket of an aerial work vehicle. [Figure 3] It is a front view of the lifting assisting tool shown in FIG. 1. [Figure 4] It is an enlarged side view of the lifting assisting tool shown in FIG. 1. [Figure 5] It is an enlarged side view showing a state after the lifting assisting tool is fixed to the side wall.

Mode for Carrying Out the Invention

[0015] Hereinafter, embodiments of the present invention will be exemplarily described with reference to the drawings.

[0016] As shown in FIGS. 1 and 2, in one embodiment of the present invention, the lifting assisting tool (1) is fixed to an upper end portion of a side wall (2) of a bucket of an aerial work vehicle. The lifting assisting tool (1) includes a holding member (3), a handrail member (4) fixed to the holding member (3), and a clamp member (5). The lifting assisting tool (1) is fixed to the side wall (2) by attaching the clamp member (5) to the holding member (3) in a state where the holding member (3) is hooked on the side wall (2) of the bucket from above, and clamping the side wall (2) and an edge (2a) of the side wall (2) between the holding member (3) and the clamp member (5). A worker working with an aerial work vehicle can improve safety when getting on and off the bucket by gripping the handrail member (4) of the lifting assisting tool (1) fixed to the side wall (2).

[0017] Hereinafter, details of the lifting aid 1 according to one embodiment will be described with reference to Figures 3 to 5. The lifting aid 1 includes a holding member 3, a handrail member 4 fixed to the holding member 3, and a clamp member 5. The holding member 3 has a horizontal portion 3a extending across the side wall 2 in the horizontal direction, an outer vertical portion 3b extending downward from an outer end of the horizontal portion 3a and facing the surface of the side wall 2 on the outer side of the bucket, and an inner vertical portion 3c extending downward from an inner end of the horizontal portion 3a and facing the surface of the side wall 2 on the inner side of the bucket. In the present application, the vertical direction in terms of gravity direction is referred to as the vertical direction, the thickness direction of the side wall 2 is referred to as the horizontal direction, the direction along the side wall 2 and perpendicular to the horizontal direction is referred to as the up-down direction, and the direction along the side wall 2 and perpendicular to the up-down direction is referred to as the left-right direction. In this embodiment, the gravity vertical direction and the up-down direction coincide with each other.

[0018] The clamp member 5 is held by the holding member 3 between the inner vertical portion 3c and the outer vertical portion 3b such that the horizontal distance between the clamp member 5 and the inner vertical portion 3c and the vertical distance between the clamp member 5 and the horizontal portion 3a are adjustable.

[0019] The clamp member 5 is held by the outer vertical portion 3b so as to be capable of relative horizontal movement with respect to the holding member 3. The clamp member 5 has a receiving member 6 capable of relative horizontal movement with respect to the holding member 3. The receiving member 6 has an outer opposing wall 6a opposing the outer vertical portion 3b, an inner opposing wall 6b opposing the inner vertical portion 3c, and a lower side wall 6c connecting the lower end of the outer opposing wall 6a and the lower end of the inner opposing wall 6b. The lifting aid 1 has a horizontal penetrating member 7 that horizontally penetrates the outer vertical portion 3b and the outer opposing wall 6a, with a tip end of the horizontal penetrating member 7 abutting the inner opposing wall 6b. The holding member 3 has a horizontal screwing portion 3d that is screwed with the horizontal penetrating member 7, and the outer opposing wall 6a has a horizontal hole 6a1 through which the horizontal penetrating member 7 penetrates. In this embodiment, the horizontal penetrating member 7 is constituted by a bolt 7a and a nut 7b, and the horizontal screwing portion 3d is constituted by a nut fixed to the outer vertical portion 3b.

[0020] By rotating the bolt 7a of the horizontal through member 7, which is screwed into the horizontal threaded portion 3d, in the tightening direction, the horizontal through member 7 moves horizontally inward relative to the outer vertical portion 3b, causing the receiving member 6 to move horizontally inward, and the horizontal distance between the clamp member 5 and the inner vertical portion 3c to be adjustable. In this embodiment, there are a total of four horizontal threaded portions 3d, two arranged vertically and two horizontally, and the configuration allows for the selection and use of two horizontal threaded portions 3d arranged horizontally to match the shape of the edge 2a of the side wall 2 to which the lifting assist device 1 is fixed. However, the number and arrangement of the horizontal threaded portions 3d can be set as appropriate. In this embodiment, the horizontal through member 7 is composed of a bolt 7a and a nut 7b, but it is not limited to this. In this embodiment, the horizontal threaded portion 3d is formed by a nut fixed to the outer vertical portion 3b by welding, but the method of fixing the nut is not limited to this, and for example, it may be fixed by adhesive. The method for forming the horizontal threaded portion 3d is not limited to forming it with a fixed nut; for example, it may be formed by a female threaded portion provided on the inner circumferential surface of a hole that penetrates the outer vertical portion 3b horizontally.

[0021] The clamp member 5 comprises a movable member 8 inserted between the outer opposing wall 6a and the inner opposing wall 6b and movable in the vertical direction, and a vertical penetrating member 9 that penetrates the lower wall 6c vertically and whose tip abuts the movable member 8 from below. The lower wall 6c has a vertical threaded portion 6c1 that screws into the vertical penetrating member 9. In this embodiment, the vertical penetrating member 9 is composed of a bolt 9a and a nut 9b, and the vertical threaded portion 6c1 is composed of a nut fixed to the lower wall 6c.

[0022] By rotating the bolt 9a of the vertical through member 9 screwed into the vertical threaded portion 6c1, the vertical through member 9 moves relative to the receiving member 6 in the vertical direction, causing the movable member 8 to move vertically, and the vertical distance between the clamp member 5 and the horizontal portion 3a to be adjustable. In this embodiment, two vertical threaded portions 6c1 are provided side by side in the left-right direction, but the number and arrangement of the vertical threaded portions 6c1 can be set as appropriate. In this embodiment, the vertical through member 9 is composed of a bolt 9a and a nut 9b, but it is not limited to this. Also, in this embodiment, the vertical threaded portion 6c1 is formed by a nut fixed to the lower surface of the lower wall 6c by welding, but the method of fixing the nut is not limited to this, and for example, it may be fixed by adhesive. The method of forming the vertical threaded portion 6c1 is not limited to being formed by a fixed nut, but for example, it may be formed by a female threaded portion provided on the inner circumferential surface of a hole that penetrates the lower wall 6c vertically.

[0023] The lifting assist device 1 is secured to the upper end of the side wall 2 by holding the clamp member 5 between the side wall 2 and the outer vertical part 3b while the horizontal part 3a of the holding member 3 is in contact with the upper end of the side wall 2 (as shown in Figure 4). From the state shown in Figure 4, the lifting assist device 1 is secured to the side wall 2 by tightening the horizontal through member 7 and the vertical through member 9, so that the edge 2a protruding horizontally outward from the upper end of the side wall 2 is clamped vertically between the horizontal part 3a and the movable member 8 of the clamp member 5, and the side wall 2 is clamped horizontally between the inner vertical part 3c and the inner opposing wall 6b of the clamp member 5 (as shown in Figure 5).

[0024] With the above configuration, by clamping the edge 2a from above and below, the lifting assist device 1 is prevented from rotating and falling off the side wall 2 even when subjected to lateral forces, thus achieving high fixing strength. Furthermore, the lifting assist device 1 can be fixed by tightening the horizontal penetrating member 7 and the vertical penetrating member 9, thus enabling easy installation. In addition, since the clamping member 5 is held in a manner that allows adjustment of the horizontal and vertical distances from the side wall 2, the lifting assist device 1 can be fixed according to the thickness of the side wall 2 and the shape of the edge 2a.

[0025] The handrail member 4 has one end 4a and the other end 4b fixed to the holding member 3, and includes a first straight section 4c connected to the vertically extending end 4a and a second straight section 4d connected to the other end 4b, and a gripping section 4e between the first straight section 4c and the second straight section 4d. At the one end 4a and the other end 4b, the handrail member 4 extends horizontally and is fixed perpendicularly to the outer vertical section 3b. The handrail member 4 is made, for example, by bending a pipe material. In this embodiment, the method of fixing the handrail member 4 to the holding member 3 is welding, but it is not limited to this, and for example, it may be fixed with bolts and nuts. With the above configuration, because the handrail member 4 has a first straight section 4c and a second straight section 4d, it becomes easier for the worker to grasp the handrail member 4 with both hands, thereby improving the safety of the worker when ascending or descending.

[0026] The handrail member 4 has a U-shape in which the first straight section 4c, the second straight section 4d, and the gripping section 4e are formed, and the plane forming the U-shape faces the side wall 2. With this configuration, the U-shape of the gripping section 4e makes it easier for the worker to quickly grasp the gripping section 4e in the event of an unexpected situation when climbing up or down the bucket, such as slipping, thus further improving safety during ascent and descent. In addition, since the first straight section 4c, the second straight section 4d, and the gripping section 4e of the handrail member 4 are provided along the side wall 2, the amount by which the climbing assist device 1 protrudes from the side wall 2 of the bucket when the climbing assist device 1 is attached to the bucket can be suppressed, so the climbing assist device 1 can be installed in a space-saving manner.

[0027] The outer vertical portion 3b has an insertion hole 3b1 extending horizontally at one end and an insertion hole 3b2 extending horizontally at the other end. One end 4a is inserted into the insertion hole 3b1 and fixed to the outer vertical portion 3b, and the other end 4b is inserted into the insertion hole 3b2 and fixed to the outer vertical portion 3b. With this configuration, the handrail member 4 can be supported by the inner circumferential surfaces of the insertion hole 3b1 and the insertion hole 3b2, thereby improving the load-bearing capacity of the handrail member 4 against loads from the vertical and horizontal directions. Furthermore, since the insertion hole 3b1 and the insertion hole 3b2 are provided on the same plane and in the same orientation, it becomes easier to insert one end 4a into the insertion hole 3b1 and the other end 4b into the insertion hole 3b2, thus achieving excellent ease of assembly.

[0028] As shown in Figure 3, in the outer vertical section 3b, the positions where one end 4a is fixed and the positions where the other end 4b is fixed are different in the vertical and horizontal directions, respectively. With this configuration, when the handrail member 4 is subjected to a load from the vertical or horizontal direction, the load on one end 4a and the other end 4b can be reduced, thereby further improving the load-bearing capacity of the handrail member 4. In this embodiment, one end 4a is fixed to the upper left corner of the outer vertical section 3b in a front view, and the other end 4b is fixed to the lower right corner of the outer vertical section 3b in a front view. However, the positions of one end 4a and the other end 4b are not limited to these. For example, one end 4a may be fixed to the lower left corner of the outer vertical section 3b in a front view, and the other end 4b may be fixed to the upper right corner of the outer vertical section 3b in a front view.

[0029] Although embodiments of the present invention have been described above, the present invention is not limited to the embodiments described above, and the embodiments described above can be modified in various ways without departing from the spirit of the present invention. [Explanation of symbols]

[0030] 1. Lifting aid 2 side wall 2a Edge 3. Retaining member 3a Horizontal part 3b Outer vertical part 3b1 One-end insertion hole 3b2 Other end insertion hole 3c Inner vertical section 3d horizontal screw joint 4 Handrail members 4a one end 4b Other end 4c 1st straight section 4d 2nd straight section 4e Grip 5. Clamping Member 6 Receiving member 6a Outside facing wall 6a1 horizontal hole 6b Inner opposing wall 6c lower wall 6c1 Vertical threaded part 7 Horizontal through member 7a Bolt 7b Nut 8. Movable Members 9 Vertical penetrating member 9a Bolt 9b Nut

Claims

1. A lifting assist device that is fixed to the upper end of the side wall of the bucket of an aerial work platform, The lifting assist device comprises a holding member, a handrail member fixed to the holding member, and a clamp member. The holding member has a horizontal portion that extends horizontally across the side wall, an outer vertical portion that faces the surface of the side wall on the outside of the bucket, and an inner vertical portion that faces the surface of the side wall on the inside of the bucket. The clamp member is held by the holding member so as to be able to adjust the horizontal distance to the inner vertical portion and the vertical distance to the horizontal portion between the inner vertical portion and the outer vertical portion, A lifting assist device in which an edge protruding horizontally outward from the upper end of the side wall is clamped vertically by the horizontal portion and the clamping member, and the side wall is fixed to the side wall by being clamped horizontally by the inner vertical portion and the clamping member.

2. The clamp member is held on the outer vertical portion so as to be movable horizontally relative to the holding member, The lifting assist device according to claim 1, wherein the clamping member comprises a movable member that can move vertically, and the vertical distance from the horizontal portion can be adjusted by moving the movable member vertically.

3. The handrail member has one end and the other end fixed to the holding member, and includes a first straight section and a second straight section extending vertically, and a gripping section between the first straight section and the second straight section. The lifting aid according to claim 1, wherein at one end and the other end, the handrail member extends horizontally and is fixed vertically to the outer vertical portion.

4. The handrail member is a lifting aid according to claim 3, wherein the first straight section, the second straight section, and the gripping section are U-shaped, and the plane forming the U-shape faces the side wall.

5. The outer vertical portion has an insertion hole at one end that extends horizontally and an insertion hole at the other end that extends horizontally. The aforementioned one end is inserted into the aforementioned one-end insertion hole and fixed to the aforementioned outer vertical portion. The lifting assist device according to claim 3, wherein the other end is inserted into the other end insertion hole and fixed to the outer vertical portion.

6. The lifting assist device according to claim 3, wherein the position where one end is fixed and the position where the other end is fixed are different in the vertical and horizontal directions, respectively, in the outer vertical portion.

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