JP3056865U - Scaffold - Google Patents

Abstract

(57) [Summary] [Problem] To provide a scaffold capable of more reliably preventing an electric shock accident such as overhead wire construction by providing electric insulation to a step [Solution] A pair of pillars 3 In a stepladder 1 in which a plurality of steps 4 are stopped and stopped, each step 4 includes a light metal core 41 formed by a co-extrusion method and a core 41.
And a covering material 42 made of an electrically insulating resin that covers at least the upper surface and the front surface of the peripheral surface. On the upper surface of the upper wall portion 42a covering the upper surface of the core material 41 of the coating material 42, a plurality of anti-slip ridges 43 extending in the longitudinal direction of the coating material 42 are formed at predetermined intervals.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a scaffold, and more particularly, to a scaffold with electrical insulation used for, for example, overhead line construction.

In this specification, “scaffold” includes a stepladder, a stepladder such as a rolling tower, a ladder, and the like.

[0003]

[Problems to be solved by conventional techniques and devices]

 For example, a stepladder used for overhead wire work must have electrical insulation to prevent electric shock accidents due to contact with terminals.

As a stepladder of this type, a plurality of steps are transferred to a pair of struts, and each strut is made of an extruded aluminum material having an electric insulating layer formed of an anodized film on its surface or an electrically insulating material. What is formed by FRP etc. which has the property is known conventionally.

[0005] In each of the above-mentioned stepladders, only the pillars are provided with electrical insulation, and the plurality of steps held between pairs of pillars are not electrically insulated. However, unless electrical insulation is given to the steps, it is not possible to reliably prevent electric shock accidents such as overhead wiring work.

[0006] The present invention has been made in view of the above circumstances, and a scaffold capable of more reliably preventing an electric shock accident during overhead line construction or the like by providing electric insulation to the steps. It is intended to provide.

[0007]

Means and effects for solving the problem

 The scaffold according to the present invention is a scaffold in which a plurality of steps are fixed to a pair of struts. In the scaffold, each step is formed by a coextrusion method, and a light metal core material and at least an upper surface of the core material peripheral surface are formed. And an electrically insulating resin covering material that covers the front surface.

As described above, if each step is constituted by the light metal core material and the electrically insulating resin covering material covering at least the upper surface and the front surface of the peripheral surface of the core material, the steps can be surely insulated. can do. In addition, since the core material and the coating material are formed by the simultaneous extrusion method, the thickness of the coating material can be increased. Therefore, even if the covering material is slightly damaged by hitting an object during carrying or applying a tool or the like during work, the electrical insulation of the step is not impaired.

In the scaffold according to the present invention, a plurality of non-slip ridges extending in the longitudinal direction of the coating material are formed at predetermined intervals on the upper surface of the upper wall portion covering the upper surface of the core material of the coating material. Is preferred.

[0010] As described above, if the non-slip ridge is formed on the upper surface of the upper wall portion covering the upper surface of the core material in the covering material, the worker slides his / her feet from a step during ascent or descent or during work. There is no danger to make it safe.

The light metal used as the core material of the step includes, for example, aluminum, titanium, and alloys thereof. Examples of the electrically insulating resin used as the material of the covering material include ABS resin and Noryl resin.

[0012]

[Embodiment of the invention]

 Next, an embodiment of the present invention will be described with reference to the drawings.

FIGS. 1 to 7 show a first embodiment of the present invention. This embodiment applies this idea to a stepladder.

As shown in FIG. 1, the stepladder (1) has a pair of right and left columns (3) and a plurality of steps (4) suspended between both columns (3). Are provided with a pair of front and rear legs (2) rotatably connected to each other.

Each pillar (3) is made of an extruded aluminum alloy material having a U-shaped cross section, and an electric insulating layer (not shown) made of an anodized film is formed on the entire surface. This electric insulating layer is formed by, for example, an alumite method using oxalic acid as an electrolyte.

An electric insulating cover (5) made of an electrically insulating resin channel, such as ABS resin or Noryl resin, is fitted on each of the columns (3) from the outside in the left-right direction. Thus, each pillar (3) is provided with electrical insulation. As shown in detail in FIGS. 2 and 3, each of the electrical insulating covers (5) has a substantially U-shaped cross section, has substantially the same length as the column (3), and has both front and rear walls (51). A bent portion (52) covering the front end surfaces of the front and rear walls (31) of the column (3) is formed at the front end of the support (3). After assembling the column (3) and the step (4), the electrical insulating cover (5) is fitted over each column (3) from the left and right sides and attached to the column (3) with screws (not shown). Have been.

In each step (4), an aluminum alloy core material (41) formed by a co-extrusion method and an electric material such as ABS resin or Noryl resin covering the entire peripheral surface of the core material (41) are used. It is made of insulating resin coating material (42). The cross section of the core member (41) has a square shape as shown in FIGS. On the upper wall (42a) of the covering (42) covering the upper surface of the core (41), a plurality of non-slip ridges (43) extending in the longitudinal direction of the covering (42) are arranged at predetermined intervals. Is formed. The ridge (43) has a triangular cross section.

The end of the step (4) is fitted in a concave portion opened inward in the left-right direction of the column (3), and both front and rear walls (31) of the column (3) are set with rivets (6). It is stopped over. Both ends (6a, 6b) of the rivet (6) are arranged in recesses (32) formed on the outer surfaces of the front and rear walls (31). The rivet (6) is made of stainless steel or aluminum alloy, and has an electric insulating layer (not shown) formed by melting and solidifying a polyvinyl chloride resin on the surface thereof. The electrical insulating layer on the surface of the rivet (6) may be formed of a caulking material such as a silicone resin.

Steps (4) located at the upper end, the center of the height and the lower end of the leg (2), respectively. (7) is passed diagonally and riveted (see Fig. 1). An electrically insulating resin layer (not shown) made of, for example, nylon or polyethylene resin is formed on the surface of the reinforcing metal fitting 7 by dipping or the like, and is electrically insulated.

As shown in detail in FIGS. 4 and 5, the upper ends of the two legs (2) are bolted through connecting metal fittings (8) riveted (not shown) to the upper ends of the columns (3). (9) ・ It is rotatably connected by a nut (10). The connecting fitting (8) is made of steel and is fixed to the upper end of the column (3) and riveted to the fixed part (8a) and the leg (2) facing the fixed part (8a). The strut (3) comprises a connecting portion (8b) extending toward the upper end. An electrically insulating resin layer (not shown) of, for example, nylon or polyethylene resin is formed on the surface of the coupling fitting (8) by dipping or the like, and is electrically insulated. The fixing portion (8a) has a tubular shape with a rectangular cross section, and has a cutout (not shown) formed on the inner wall in the left-right direction into which the end of the uppermost step (4) is fitted. I have. The left-right outer wall of the fixing portion (8a) has a triangular upward protruding portion (81) projecting upward from the uppermost step (4). The upper protruding portion (81) functions as a stopper when the worker standing at the uppermost step (4) slides his or her foot outward in the left-right direction. The connecting portion (8b) has a substantially triangular plate shape as viewed from the side as shown in FIG. 4 and has a bolt insertion hole (82) at its tip, and the right and left sides of the column (3) as shown in FIG. It is provided so that it may be located inside the outer surface in the direction. As a result, the head (9a) of the bolt (9) inserted through the bolt insertion hole (82) of the paired connecting portion (8b) does not protrude outward from the lateral outer surface of the column (3). It is like that. The bolt (9) is made of stainless steel, and the head (9a) is fitted with a cap (11) made of an electrically insulating resin such as a polyethylene resin, for example, and is electrically insulated.

Further, the stepladder (1) includes an opening stopper (12) for both legs (2). One end of each of the pair of left and right link members (121) of the opening stopper (12) is rotatable by bolts (9) and nuts (10) via a connecting member (122) having a downwardly open groove. The other end of the link member (121) is connected to the left and right ends of the step (4) located near the upper ends of the front and rear legs (2) via fixing members (123) riveted to these. The left and right connecting members (122) are rotatably connected by rivets (13), and are connected to each other by a connecting rod (124) riveted (not shown) to these opposing walls (see FIG. 1). . The link member (121), the connecting member (122), the fixing member (123), and the connecting rod (124) constituting the opening stopper (12) are all made of steel. Alternatively, an electrically insulating resin layer (not shown) such as a polyethylene resin is formed by dipping or the like, and is electrically insulated. A cap (not shown) made of, for example, an electrically insulating resin such as a polyethylene resin is fitted over the head of the bolt (9). The rivet (13) is made of an aluminum alloy, and has an electric insulating layer (not shown) formed by melting and solidifying a polyvinyl chloride resin on the surface thereof.

Non-slip caps (14A, 14B) are fitted and attached to the lower ends of the columns (3) and the electric insulating cover (5). As shown in detail in FIGS. 6 and 7, the non-slip cap (14A, 14B) is formed of a substantially cylindrical body having a rectangular cross section. Outwardly open recesses (15, 16) are formed on both front and rear walls of the non-slip caps (14A, 14B). Further, bolt insertion holes (17) are formed in the bottom wall portions of these concave portions (15, 16). Also, corresponding to these bolt insertion holes (17), bolt insertion holes (18, 19) are provided at the lower ends of the front and rear walls (31, 51) of the column (3) and the electrical insulation cover (5). Has been opened. Then, the nut (21) is screwed into the tip of the bolt (20) inserted through the bolt insertion hole (17, 18, 19), so that the non-slip cap (14A, 14B) is It is attached to the support (3) and the lower end of the electrical insulation cover (5). The head of the bolt (20) and the nut (21) are located in the recesses (15, 16) of the front and rear walls of the non-slip caps (14A, 14B). Thus, it is possible to prevent the occurrence of an electric shock accident through the bolt (20) and the nut (21). A plurality of anti-slip projections (22) extending left and right are formed at predetermined intervals in the front-rear direction on the bottom surface of the anti-slip caps (14A, 14B). A fitting projection (23) protruding rearward is formed at the lower part of the rear wall of the non-slip cap (14A) of the front leg (2), and is located in front of the non-slip cap (14B) of the rear leg (2). A fitting concave portion (24) into which the fitting convex portion (23) is fitted is formed at a lower portion of the wall. As shown in FIG. 6 (b), when the legs (2) are closed, the fitting projections (23) and the recesses (24) are fitted together, thereby displacing the legs (2). Because it can be prevented, it is convenient for carrying around.

FIG. 8 shows a second embodiment of the present invention. This embodiment is the same as the first embodiment except for the following points. That is, as shown in FIG. 8, each step (40) of a stepladder is formed by a core material (401) having a substantially pentagonal cross section formed by a coextrusion method, and an upper surface and a front surface of the core material (401). It consists of a covering material (402) having a substantially inverted L-shaped cross section. The upper wall portion (401a) of the core member (401) has an overhanging portion (411) that projects rearward from the rear wall portion (401b). Further, the front wall portion (401c) of the core member (401) has a hanging portion (412) extending downward from a connection portion with the inclined wall portion (401d). The covering material (402) covers the upper wall portion (402a) covering the upper surface of the upper wall portion (401a) of the core material (401) and the outer surface of the front wall portion (401c) of the core material (401). Cover the front wall (402b), the overhanging part (411) of the upper wall (401a) of the core material (401), and the inner surface of the hanging part (412) of the front wall (401b). Folded wall portions (402c, 402d). A plurality of non-slip ridges (413) extending in the longitudinal direction of the coating (402) are formed at predetermined intervals on the upper surface of the upper wall (402a) of the coating (402).

[Brief description of the drawings]

FIG. 1 is a perspective view of a stepladder showing a first embodiment of the present invention.

FIG. 2 is an enlarged sectional perspective view showing a connection portion between a column of a stepladder and a step in the first embodiment.

FIG. 3 is a sectional view taken along line III-III in FIG. 2;

FIG. 4 is an enlarged side view showing a connecting portion between the legs of the stepladder according to the first embodiment.

FIG. 5 is a sectional view taken along line VV of FIG. 2;

FIG. 6A is an enlarged side view showing a lower end of an open leg of the stepladder according to the first embodiment, and FIG. 6B is an enlarged view of a lower end of the closed leg. It is a side view.

FIG. 7 is a sectional view taken along the line VII-VII of FIG. 6 (a).

FIG. 8 is a perspective sectional view of a step on a stepladder showing a second embodiment of the present invention.

[Explanation of symbols]

 (1)… Stepladder (scaffold) (3)… Post (4)… Step (41)… Core material (42)… Coating material (42a)… Upper wall (43)… Non-slip ridge (40)… Step (401)… Core material (402)… Coating material (402a)… Upper wall (413)… Protrusion for non-slip

Claims (2)

[Utility model registration claims] 1. A scaffold in which a plurality of steps are suspended between pairs of struts, each step comprising a light metal core material formed by a co-extrusion method, and at least an upper surface and a core surface of the core material. A scaffold characterized by comprising an electrically insulating resin covering material covering the front surface. 2. A plurality of non-slip ridges extending in the longitudinal direction of the covering material are formed at predetermined intervals on the upper surface of an upper wall portion covering the upper surface of the core material in the covering material. The scaffold according to claim 1.