JPH10205257A - Rotary metal fitting of trestle functioning as ladder in combination - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve strength and safety by forming L-shaped sectional reinforcing projecting edges at the upper edge sections and outer edge sections of a pair of plate-shaped rotary members, to which inner end sections are pivotally attached. SOLUTION: Lug pieces 13, 14 formed while oppositely facing the upper sections of the inner edges of a pair of plate-shaped rotary members 11, 12 are connected by a pivot pin 15, and the rotary metal fitting M is constituted. L-shaped sectional reinforcing projecting edge sections 11a, 12a, 11b, 12b inwards projected to leg bodies 6, 7 are formed at the upper edges and outer edges of the members 11, 12 respectively. The metal fitting M abutts on the main body sections of the members 11, 12 against left-right both side-face upper end sections of the leg bodies 6, 7 and is festered by screws 20. Accordingly, the strength of the rotary members can be increased while strength at a time when the rotary members are spread particularly in a ladder shape can be augmented because the L-shaped sectional reinforcing projecting edges are formed, and a clearance between the upper end faces of the leg bodies is widened by the thickness sections of the reinforcing projecting edges because the upper-edge side reinforcing projecting edges of both rotary members are abutted at the time when the rotary members are formed in the ladder shape, and a serious accident such as the cutting of a hand and a finger can be avoided even when the hand and the finger are held.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary bracket for connecting a pair of legs so as to open and close so that the pair of legs can be opened and closed to form a ladder stepladder.

[0002]

2. Description of the Related Art FIG. 5 shows a conventional rotary fitting N used for a ladder / split stepladder, comprising a pair of flat rotary members 1 and 2, each of the flat rotary members 1 and 2. The ear pieces 3, 4 which are integrally provided facing the upper side of the inner edge are connected by a pivot pin 5 such as a rivet. The rotating bracket N is used as a set of two, and is attached to the upper ends of the left and right sides of a pair of legs 6, 7 as shown in FIG. The legs 6, 7 can be held at a required angle in the closed state as shown by the solid line.
While the one rotating member 1 is fixed, the other rotating member 2 is rotated upward as shown by the imaginary line in the same figure, so that the upper edges of the two rotating members 1 and 2 are brought into contact with each other. Thereby, it can be used as a ladder.

[0003]

The conventional rotating bracket N is
Since each of the rotating members 1 and 2 is entirely flat,
In particular, the mechanical strength when deployed in the state of using a ladder is weak,
There was a risk of deformation. Further, as described above, the rotating members 1 and 2 are used in the form of a flat plate, and the rotating members 1 and 2 are mounted at substantially the same height as the legs 6 and 7, so that both rotating members are used when the ladder is used. When the members 1 and 2 are deployed so that the upper edges thereof abut each other, there is a danger of causing a serious accident such as clipping a finger between the upper end surfaces of both legs 6 and 7 and cutting the finger. .

[0004] The problem to be solved by the present invention is to greatly improve the mechanical strength of the rotating member, and when the two rotating members are deployed in the state of using a ladder, the gap between the upper end surfaces of both legs is required. This is to prevent a major accident from occurring even if fingers or the like are pinched.

[0005]

The invention according to claim 1 is
In the ladder / split rotary fitting which is formed by pivotally connecting the inner ends of the pair of flat rotating members 11 and 12 to each other, the upper end edge and the outer end edge of each flat rotating member 11 and 12 have a cross section L. The reinforcing protrusions 11a, 12a and 11b, 12b are formed by bending into a letter shape.

According to a second aspect of the present invention, in the rotating metal fitting of the ladder and stepladder according to the first aspect, each of the reinforcing projections 11a and 12a is provided.
, And 11b and 12b are formed integrally from the upper edge to the outer edge of each of the plate-shaped rotating members 11 and 12 via a rounded portion R of a corner.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a ladder and stepladder rotary fitting M according to the present invention. The rotary fitting M is a pair of flat rotary members 11 each formed by pressing a steel plate. , 12; the two flat rotating members 1
The earpieces 13 and 14 which are integrally connected to the upper ends of the inner edges 1 and 12 are rotatably connected to each other by a pivot pin 15 such as a rivet. As shown in FIG. 2, the rotating metal fittings M are used in pairs, and are attached to the upper ends of the left and right side surfaces of the pair of front and rear legs 6, 7, respectively. Can be held in a closed state at a required angle as shown by a solid line. To use it as a ladder, from the stepladder use state, rotate one rotating member 11 upward while fixing the other rotating member 11 upward. Then, the upper ends of both rotating members 1 and 2 may be brought into contact with each other as shown in the phantom line of FIG.

FIGS. 1 and 3 show the structure of the rotating bracket M.
4 and FIG. 4, each plate-shaped rotating member 1 formed by pressing a steel plate having a required thickness.
The upper end edge and the outer edge of each of the first and second rims are bent into an L-shaped cross section to form reinforcing protrusions 11a, 12a and 11b.
b, 12b. In addition, each reinforcing edge 11
a, 12a and 11b, 12b are formed so as to project inward with respect to the legs 6, 7, as can be seen from FIG.

FIG. 3A shows one flat rotating member 11.
(B) and (C) are left and right side views, and (D) is a plan view. As can be seen from these figures, the reinforcing protruding edge portion 11a of the flat rotating member 11 and the reinforcing Edge 1
1b is formed integrally from the upper end edge to the outer end edge of the plate-shaped rotating member 11 via a rounded portion R of the corner. The reinforcing edge 11a on the upper edge side is shown in FIG.
As shown in (C), the main body of the flat rotating member 11 is bent at an angle of about 95 degrees, which is slightly larger than 90 degrees, and the reinforcing edge 11b on the outer edge side is shown in FIG. Thus, it is bent at 90 degrees with respect to the main body of the flat rotating member 11. This is because, as can be seen from FIG. 2, the left and right side edges of the legs 6, 7 are slightly inclined so as to expand downward. 2, the reinforcing edge 11a on the upper edge side is
It is horizontal as shown in FIG.

FIG. 4A shows the other flat rotary member 12.
Are front views, (B) and (C) are right and left side views, and (D) is a plan view. Like the one flat plate rotating member 11, the plate-shaped rotating member 11 has a reinforcing projection. The portion 12a and the reinforcing lip 12b are integrally formed so as to be continuous from the upper edge to the outer edge of the plate-shaped rotating member 11 via the rounded portion R of the corner, and similarly, the upper edge portion is formed. The reinforcing protruding portion 12a is bent at an angle of about 95 degrees with respect to the main body of the flat rotating member 12, and the reinforcing protruding edge 12b on the outer edge side is 90 ° away from the main body of the flat rotating member 12.
It is bent every time.

A pin insertion hole 18 is formed in each of the lugs 13 and 14 of each of the flat rotating members 11 and 12 so that
A plurality of screw holes 19 are formed in the body portions 1 and 12. Thus, the two flat rotating members 11 and 12 are
3 and 14, the pivot pins 16 are inserted into the pin insertion holes 18 and 18 and are rotatably connected by, for example, riveting. As shown in FIG.
Becomes In addition, the rotating metal fitting M includes rotating members 11 and 12.
Of the pair of front and rear legs 6, 7 in contact with the upper ends of the left and right side surfaces of the pair of legs 6, 7.
By screwing 0 and attaching it, a ladder / split stepladder as shown in FIGS. 1 and 2 can be formed. In FIG. 2, reference numeral 21 denotes an upper crosspiece of the legs 6 and 7, and reference numeral 22 denotes a tread.

According to the rotating metal fitting M having the above-described configuration, the upper edge and the outer edge of each of the plate-like rotating members 11 and 12 formed by pressing a steel plate have an L-shaped cross section. Bent to form reinforcing tongues 11a, 12a and 1
1b, 12b, each rotating member 11, 1
The mechanical strength of No. 2 is greatly improved, and the strength is particularly enhanced when the ladder is deployed in a used state, and there is no possibility of deformation. Further, the upper edge side reinforcing projections 11a, 12a and the outer edge side reinforcing projections 1 of each of the plate-shaped rotating members 11, 12 are provided.
1b and 12b are integrally formed so as to be continuous from the upper edge to the outer edge of the plate-shaped rotating member 11 via a rounded portion R of the corner.
2 is further increased.

In addition, in this rotating metal fitting M, when the flat rotating members 11 and 12 are deployed in a state of using a ladder, the reinforcing edge portions 11a and 12a on the upper end side of the rotating members 11 and 12 are provided.
But the gap between the upper end surfaces of the two legs 6 and 7 is larger than that of the conventional rotating fitting N by the two reinforcing projections 11a and 1a.
2a, so that even if a finger is pinched between the upper end surfaces of the legs 6, 7 when the rotating members 11, 12 are deployed, a serious accident such as cutting the finger is performed. Can be avoided.

[0014]

According to the first aspect of the present invention, the upper edge and the outer edge of each plate-shaped rotating member are bent into an L-shaped cross section, and the reinforcing projection is formed. Is formed, the mechanical strength of each rotating member is greatly improved, and the rotating member is not deformed particularly when deployed in a ladder use state, and can be used safely.
In addition, when the two flat rotating members are deployed in the ladder use state, the upper edge side reinforcing projections of both the rotating members always abut, so that at least the thickness of both the reinforcing projections between the upper end surfaces of the two legs. Therefore, even if a finger is pinched between the upper end surfaces of both legs when the two rotating members are deployed, a large accident such as cutting the finger can be avoided.

According to the second aspect of the present invention, since the reinforcing projection is formed so as to be continuous from the upper edge to the outer edge of the flat rotary member via the rounded corner, the strength of the rotary member is reduced. It is possible to provide a further increased and extremely robust rotating fitting.

[Brief description of the drawings]

FIG. 1 is a front view showing a rotating bracket according to the present invention.

FIG. 2 is a front view of a ladder and stepladder to which rotating brackets are attached on both left and right sides.

FIG. 3A is a front view of one flat rotating member,
(B) and (C) are left and right side views, and (D) is a plan view.

FIG. 4A is a front view of the other flat rotating member,
(B) and (C) are left and right side views, and (D) is a plan view.

FIG. 5 is a front view showing a conventional rotating bracket.

[Explanation of symbols]

 N Conventional rotating bracket 6 Leg 7 Leg M Rotating bracket 11 of the present invention 11 Plate-shaped rotating member 11a Reinforcement ridge on upper edge 11b Reinforcement ridge on outer edge 12 Plate-shaped rotating member 12a Upper edge Reinforcement ridge 12b Reinforcement ridge on outer edge 15 Pivot pin

Claims (2)

[Claims] 1. A ladder / stepladder rotating bracket formed by pivotally connecting inner ends of a pair of plate-shaped rotating members to each other, wherein the upper end edge and the outer edge of each plate-shaped rotating member have a cross section L.
A turning metal fitting for a ladder and stepladder, which is bent into a letter shape to form a reinforcing lip. 2. The rotation of the ladder / stepladder according to claim 1, wherein the reinforcing projection is formed integrally from the upper edge to the outer edge of the rotating member via a rounded portion of a corner. Metal fittings.