JP2821666B2 - Ladder cross rail - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ladder used as a scaffold at a construction site, for example. The present invention relates to a crosspiece for a ladder fixed to a tree.

[0002] In this specification, the term "aluminum" shall include aluminum alloys in addition to pure aluminum.

In this specification, the right side of FIG. 2 is referred to as front, the left side is referred to as rear, and the upper and lower sides of FIG. The left and right in FIG. 3 are referred to as left and right.

[0004]

2. Description of the Related Art Conventionally, as a horizontal rail for a ladder of this type, an aluminum end member is welded to both ends of a rectangular plate-like body.
Those fixed with rivets or the like were used. The plate is made of extruded aluminum material, the length direction of which is the same as the extrusion direction, and a plurality of non-slip ridges extending in the length direction are provided on the upper surface of the plate at intervals in the width direction. It was formed integrally.

[0005]

However, in the conventional ladder horizontal rail, a plurality of anti-slip ridges extending in the length direction are formed on the upper surface of the plate-like body. Sliding could be stopped, but it was dangerous because it could not stop the length of the horizontal rail. Further, in the conventional horizontal rail, since two types of materials, that is, a plate-shaped body and an end member, must be separately manufactured, there is a problem that the operation is troublesome and the cost is increased.

An object of the present invention is to provide a ladder cross rail which solves the above-mentioned problem.

[0007]

A first crosspiece for a ladder according to the present invention is provided with a plurality of side bars parallel to each other at intervals in the length direction thereof, and both left and right ends are connected to the side bars. An aluminum extruded profile having a plurality of through-holes extending in the extrusion direction, comprising a single plate-like body having a plurality of through-holes extending in the up-down direction, which is a horizontal rail for a ladder to be fixed. Is formed by cutting at a predetermined angle with the extrusion direction, and thick portions are formed on the left and right side walls of the plate-shaped body.
As well as penetrating the thick part of
By screwing a nut onto the tip of the bolt
The body is fixed to the side tree .

A second ladder crosspiece according to the present invention is a plurality of ladder crosspieces which are arranged between a pair of parallel sidebars at intervals in the length direction thereof and both right and left ends of which are fixed to the sidebars. It is a crosspiece, has a plurality of through holes extending in the vertical direction, and is composed of a plurality of plate-like bodies arranged in the front-rear direction so that the upper surface is flush, and all the plate-like bodies are in the extrusion direction. It is formed by cutting one type of extruded aluminum material having a plurality of extending through holes so as to form a predetermined angle with the direction of extrusion, and has the same shape.

[0009]

According to the first ladder cross rail of the present invention, the plurality of through-holes of the plate-like body are non-slip in all directions. In addition, it consists of one sheet, and this sheet is
Since it is formed by cutting an aluminum extruded profile having a plurality of through holes extending in the extrusion direction so as to form a predetermined angle with the extrusion direction, a large number of plate-like bodies are formed.
It can be formed from one type of extruded profile, making it easier to manufacture and less expensive.

According to the second ladder cross rail of the present invention, the plurality of through-holes of the plurality of plate-like members arranged in the front-rear direction so that the upper surfaces thereof are flush with each other are provided with anti-slip in all directions. Become. In addition, all the plate-like bodies are formed by cutting a single type of aluminum extruded material having a plurality of through holes extending in the extrusion direction so as to form a predetermined angle with the extrusion direction and have the same shape. So that many plates can be formed from one type of extruded profile,
The manufacturing work becomes easier and the cost is lower.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, the horizontal rail according to the present invention is applied to a scaffold ladder.

FIG. 1 shows a cross rail according to the present invention, FIG. 2 shows a scaffold ladder using the cross rail of FIG. 1, and FIG.

The scaffolding ladder (1) is provided with a pair of left and right aluminum extruded profile side bars (2) parallel to each other, and a plurality of side ladders (2) spaced apart in the longitudinal direction between the both side bars (2). The left and right ends consist of horizontal rails (3) fixed to side trees (2).

The side piece (2) has a U-shaped cross section, and its opening is arranged outward in the left-right direction.

The cross rail (3) comprises a single plate-like body (5) having a plurality of through holes (4) extending vertically. Plate (5)
Thick part (6) at the center in the front-rear direction of the left and right side walls (5a)
Are formed. This plate-like body (5) is formed by cutting an aluminum extruded profile having a plurality of through holes extending in the extrusion direction at a right angle to the extrusion direction. That is, the plate-like body (5) is
Is formed by cutting an aluminum extruded profile having the same cross-sectional shape as seen from above from a plane so as to be perpendicular to the extrusion direction.

The left and right ends of the plate-shaped body (5) are thick portions of the web part (2a) of the side member (2) and the left and right side walls (5a) of the plate-shaped body (5).
A nut (8) is screwed into each of the ends of two bolts (7) penetrating from (6) from the outside, and is fixed to the side member (2).

FIGS. 4 and 5 show another embodiment of the cross rail according to the present invention.

In FIG. 4 and FIG. 5, the cross rail (10) is composed of two front and rear plate-like members (11) and (12) arranged in the front-rear direction so that the upper surface is flush. Each of the plate-like bodies (11) and (12) has a plurality of through-holes (13) and (14) extending vertically.
L-shaped engaging portions (15) protruding rearward and bent to the left are respectively provided at portions of the outer surface of the rear side wall portion (11a) of the front plate-like body (11) near the left and right ends and a central portion in the left and right direction. It is formed integrally. Also, the left and right side walls of the front plate (11)
A thick portion (16) is formed at the rear end of (11b). L-shaped engaging portions (17) projecting forward and bent rightward at the right and left ends of the outer surface of the front side wall portion (12a) of the rear plate-like body (12) and at the center portion in the left-right direction, respectively. Are integrally formed. Thick portions (18) are formed at the front ends of the left and right side walls (12b) of the rear plate-like body (12). That is, the rear plate-shaped body (12) has the same shape as the front plate-shaped body (11), and the front plate-shaped body (11) is arranged so as to be opposite to the front and rear. These plates
(11) (12) is formed by cutting an aluminum extruded profile having a plurality of through holes extending in the extrusion direction and a ridge having an L-shaped cross section so as to be perpendicular to the extrusion direction. is there. That is, these plate-like bodies (11) (12)
Is formed by cutting an aluminum extruded profile having the same cross-sectional shape as the plate-like body (11) (12) when viewed from a plane, so as to be perpendicular to the extrusion direction. is there.

The two plate-like members (11) and (12) are engaged with each other by engaging portions (15) and (17), and the web portion (2a) of the side member (2) and each plate-like member (11) Left and right side walls of (12) (11b) (12b) thick wall (1
6) A nut (8) is screwed into the tip of each of two bolts (7) penetrating from the outside from (18), and is fixed to the side member (2).

In the above, since the engaging portions (15) and (17) of the front and rear plate-like bodies (11) and (12) are engaged with each other,
The rotation of the plate-like members (11) and (12) around the bolt (7) is prevented.

In the above, the front and rear plate-like members (11) (1)
2) may be fixed to each other by welding or the like.

In the other embodiment, the number of engagement portions between the front plate and the rear plate is such that the rear plate has the same shape as the front plate. The present invention is not limited to the above-described one as long as the front plate-shaped body is reversed in the front and rear direction.
Further, in the above other embodiment, the number of plate-like members forming the horizontal rail is not limited to two, but may be three or more.

[0023]

According to the two cross rails for a ladder of the present invention,
As described above, the plurality of through-holes of the plate-shaped member serve as slip stoppers in all directions, so that safety is improved. Also,
The manufacturing work becomes easier and the cost is lower.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a horizontal rail according to the present invention.

FIG. 2 is a side view of a scaffold ladder using the horizontal rail of FIG. 1;

FIG. 3 is an enlarged sectional view taken along line III-III of FIG. 2;

FIG. 4 is a perspective view showing another embodiment of the horizontal rail according to the present invention.

5 is a view corresponding to FIG. 3 showing a scaffold ladder using the horizontal rail of FIG. 4;

[Explanation of symbols]

 (1) Scaffolding ladder (2) Side beam (3) Side beam (4) Through hole (5) Plate (10) Side beam (11) Plate (12) Plate (13) Through hole ( 14) Through hole

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int.Cl. ⁶ , DB name) E04G 1/30 E04G 1/26 E04G 5/08 E06C 1/00-9/14

Claims (2)

(57) [Claims] 1. A ladder crosspiece which is disposed between a pair of parallel sidebars at intervals in its length direction and whose left and right ends are fixed to the sidebars, and which extends in the vertical direction. Is formed by cutting an aluminum extruded section having a plurality of through holes extending in the extrusion direction so as to form a predetermined angle with the extrusion direction. Thick parts are formed on both left and right side walls of the plate
As well as penetrating the thick part of
By screwing a nut onto the tip of the bolt
A ladder crosspiece whose body is fixed to a side tree . 2. A crosspiece for a ladder, which is disposed between a pair of side trees parallel to each other at intervals in the length direction and has both left and right ends fixed to the side trees, the plurality of rails extending in the vertical direction. It has a plurality of plate-like bodies arranged in the front-rear direction so that the upper surface is flush with all the plate-like bodies, and all the plate-like bodies have
A ladder crosspiece formed by cutting one type of extruded aluminum material having a plurality of through holes extending in the extrusion direction so as to form a predetermined angle with the extrusion direction and having the same shape.