JP2001073548A - Trestle connection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate setting-up of a scaffold by connecting at night angles mutual trestles composed of a rectangular top scaffold plate provided with a pair of hook fixing brackets at both longitudinal ends and collapsible legs attached to both ends of the top scaffold plate. SOLUTION: Two trestles are oppositely arranged at right angles to form T type or L type. A bracket b of the longitudinal end of a top scaffold plate 1 in one of the trestles is put between a pair of upper and lower plates 7a, 7b of a joint 5A. Then, a connection pins 8 are inserted into both pin holes 6a, 6b of the upper and lower plates 7a, 7b through the bracket b to connect respective first joints 5A to the top scaffold plate 1. Further, two connection pins 13 in a pair of second joints 5B are dropped onto the top scaffold plate 1 of the other trestle to connect the second joints 5B to the top scaffold plate 1. Then, the lower leg of the connection part of the first joint 5A is folded. Hence, three-legged T-shaped simple working scaffold having T-shape can be assembled with two trestles.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a stepladder connecting device.

[0002]

2. Description of the Related Art A rectangular scaffolding top plate having a large number of through holes formed at a predetermined pitch for the purpose of preventing slippage and weight reduction, and is foldably pivotally attached to both longitudinal ends of the scaffolding top plate. A stepladder having a ladder-shaped leg is used as a simple work platform indoors and outdoors. When using as a work scaffold, for example, one stepladder is used alone, and two or more stepsladders are arranged in series or in parallel at a predetermined interval, and another scaffold board is provided between the scaffolding top boards of both stepladders. It may be installed and used.

[0003] However, in any of the use modes, two legs are required for one stepladder, so that one of the legs is in the way and the stepladder cannot be installed in a necessary place. . For example, in the renovation of existing buildings, construction and equipment work inside and outside the ceiling (suspending air conditioner indoor units, installing lighting fixtures,
Wiring, ceiling work, etc.), it is necessary to perform necessary work within a limited time on non-business days, so it is desirable to build a simple work scaffold using a stepladder, but it was placed indoors Desks, cabinets, personal computers, and other fixtures became obstacles, and the stepladders could not be installed where needed, making it impossible to assemble a simple work platform.

[0004]

SUMMARY OF THE INVENTION In view of the above situation, according to the present invention, stepladders are arranged at right angles to each other, for example, T-shaped or L-shaped, and at the same time, a leg below the connecting portion is folded to form a stepladder. By using two units and three legs, it is possible to assemble a simple work platform at the required place across obstacles such as desks, cabinets, personal computers, and other fixtures placed indoors. And a stepladder connecting device.

[0005]

The technical measures taken by the present invention to solve the above-mentioned problems are as follows. That is, the stepladder connecting device according to the first aspect of the present invention is a rectangular scaffold top plate having a large number of through holes formed at a predetermined pitch, and a pair of hook locking brackets provided at both ends in the longitudinal direction. And a stepladder connecting device comprising legs which are pivotally attached to both ends in the longitudinal direction of the scaffold top plate, and which are arranged at right angles to each other and connected to each other. At both ends in the longitudinal direction, the upper and lower plates protruding to one side in the width direction of the main body frame and having concentric pin holes formed therein, and the brackets sandwiched between the upper and lower plates are passed through the upper and lower plates. A first joint portion configured to be connectable to a longitudinal end portion of the scaffolding top plate on one of the stepladders, and a connecting pin protruding toward the opposite side to the upper plate portion. The protruding piece and its tip end Wherein the dropped from above into the through hole consists of a connecting pin capable of, it is constructed by providing a second joint portion which is connectable configured on the side of the scaffold top plate in the other ladder.

If the above-mentioned stepladder connection device is used, two stepladders, such as T-shaped and L-shaped, are arranged at right angles to each other, and a hook lock provided at one longitudinal end of the scaffold top plate on one of the stepladders. The first joint portion is inserted between the upper and lower plate portions of the first joint portion through the bracket, and the connecting pin is inserted into the pin holes of the upper and lower plate portions, thereby connecting the first joint portion to the scaffold top plate on one stepladder. A second connecting pin, which is connected to the end in the longitudinal direction, is provided on the side of the scaffolding top plate of the other stepladder by dropping a connecting pin vertically provided at the tip of the protruding piece into a through hole of the scaffolding top plate from above. The joints are connected, and the leg located below the connection by the first joint is folded, and the two
It is possible to assemble a T-shaped or L-shaped working scaffold of the main leg.

Accordingly, it is possible to assemble a simple work scaffold at a required place by straddling obstacles such as desks, cabinets, personal computers, and other fixtures placed indoors. In addition, the second joint portion is connected to the side portion of the scaffolding top plate by using a through hole formed in the scaffolding top plate at a predetermined pitch.
It can be connected to any position on the side of the scaffold top plate, and a work scaffolding such as T-shape or L-shape corresponding to the layout of furniture can be assembled.

If the bracket is formed in a shape having an internal space larger than the diameter of the connecting pin, the bracket is formed so as to prevent rattling around the connecting pin. As described in 2, it is desirable to provide the main frame with a steadying projection on the side surface on the side of the first joint portion, which is in contact with the opposing side surfaces of the hook locking brackets on both sides.

According to the third aspect of the present invention, in the case where a stepladder having no hook locking brackets at both ends in the longitudinal direction of the scaffold top plate is to be connected, the length of the horizontally long main body frame is set. Upper and lower plate portions projecting to one side in the width direction of the main body frame and formed with concentric pin holes at both ends in the direction, and through holes of a scaffolding top plate sandwiched between the upper and lower plate portions. A first joint portion which is configured to be connectable to a longitudinal end of the scaffold top plate on one of the stepladders and a side opposite to the upper plate portion. A projecting piece, and a connecting pin that is vertically attached to the tip of the projecting piece and can be dropped into the through hole from above, and is configured to be connectable to the side of the scaffolding top plate in the other stepladder. And a second joint part,
This constitutes a stepladder connecting device.

If this stepladder connecting device is used, two stepladders such as T-shaped and L-shaped are arranged at right angles to each other, and the longitudinal end of the scaffold top plate on one of the stepladders is located above the first joint portion. Sandwiched between the lower plate parts, through the through hole of the scaffold top plate,
By inserting the connecting pin into the pin hole of the lower plate,
The joint part is connected to the longitudinal end of the scaffolding top plate in one stepladder, and a connecting pin vertically attached to the tip of the protruding piece is attached to the side of the scaffolding topplate in the other stepladder. The second joint portion is connected by being dropped into the through hole from above, and the leg located below the connecting portion formed by the first joint portion is folded, so that the two stepladders can be used as a three-legged T-type or L-type working scaffold. Can be assembled, and has the same advantages as the stepladder connecting device according to the first aspect of the present invention.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 show an example of a stepladder connection device A according to the present invention. In this stepladder connection device A, a large number of through holes a are drilled at a predetermined pitch (for example, 100 mm pitch) for the purpose of preventing slippage and weight reduction, and a pair of hook locking brackets b are provided at both ends in the longitudinal direction. Two ready-made stepladders 3 and 3 having a rectangular scaffold top 1 provided and ladder-like legs 2 a and 2 b pivotally attached to both ends in the longitudinal direction of the scaffold top 1. Are arranged at right angles to each other and connected to each other, and at both ends in the longitudinal direction of a horizontally long main body frame (for example, composed of a square pipe) 4 shorter than the short side of the scaffold top plate 1, One stepladder 3
A pair of first joints 5A configured to be connectable to the longitudinal end of the scaffold top 1 and a pair of second joints configured to be connectable to the side of the scaffold top 1 in the other stepladder 3. 5B. Reference numeral 1a denotes an end face plate provided at right angles downward from four sides of the scaffold top plate 1, and 1b denotes a reinforcing bent plate bent at a right angle inward from its lower end.

Each of the first joint portions 5A is connected to the body frame 4
Pin holes 6a, 6b protruding to one side in the width direction of the
Through the upper plate 7a and the lower plate 7b formed with the upper and lower plates 7a and 7b.
And a connecting pin 8 which can be inserted and withdrawn over the pin holes 6a and 6b of the lower plate portions 7a and 7b. 4a is a notch for reducing the weight, which is formed on both upper and lower surfaces of the main body frame 4.

The connecting pin 8 shown in the figure has a screw portion 8d at the tip end of a shaft 8c having a hexagonal hole 8b formed on the upper surface of a circular head 8a.
Is formed. The pin hole 6a formed on the protruding tip side of the upper plate 7a has a large-diameter hole into which the circular head 8a fits and a small-diameter hole having an inner diameter corresponding to the diameter of the shaft 8c. The pin hole 6b formed in the lower plate portion 7b is
It is formed in a female screw to be screwed with d.

The bracket b is formed by bending a metal plate, and includes a front plate 9a, side plates 9b, 9b bent at right angles in the same direction from both ends thereof, and a mounting plate bent at a right angle from the tip thereof. The mounting plate portions 9c, 9c are screwed to the end surface plate 1a of the scaffold top plate 1. At the upper edge of the center of the front plate 9a of the bracket b, a concave portion c for inserting and locking a hook 10a protruding from the longitudinal end of another scaffold plate 10 is formed.

On the side surface of the main frame 4 on the side of the first joint portion 5A, there are provided anti-sway projections 11 which come into contact with opposing side surfaces (side plates 9b) of the hook locking brackets b on both sides. . The illustrated steady rest projection 11 fixes a single square steel material to the side surface of the main frame 4 on the side of the first joint portion 5A by welding or the like, and both ends are opposed to the hook locking brackets b on both sides. The main frame 4 of the first joint portion 5A caused by the gap between the connecting pin 8 and the internal space of the bracket b by contacting the side surface (side plate 9b)
Although it is configured to prevent rattling in the longitudinal direction, two small members independent of each other are attached to the main body frame 4.
The anti-sway projection 11 may be fixed to the side surface of the first joint 5A by welding or the like.

Each second joint 5B is connected to the upper plate 7a.
And a connecting pin 13 which is fixed to the tip end of the projecting piece 12 by welding or the like and is vertically provided, and which can be dropped into the through hole a from above.

The pitch of the connecting pins 13 is set to an integral multiple of the pitch of the through holes a. In the illustrated embodiment, the upper plate portion 7a and the protruding piece 12 are formed by welding a single metal plate so that both ends thereof protrude in the width direction of the main body frame 4. Alternatively, separate metal plates may be welded.

According to the above configuration, as shown in FIG.
The two stepladders 3 and 3 are arranged at right angles to each other, for example, T-shaped or L-shaped, and a pair of first joints 5A, a lower plate 7a,
7b, the brackets b at the longitudinal ends of the scaffold top plate 1 on one stepladder 3 are sandwiched between the brackets b.
Through the pin holes 6a and 6b of the upper and lower plate portions 7a and 7b, thereby connecting each of the first joint portions 5A to the longitudinal end of the scaffolding top plate 1, and Connecting pins 1 in the second joint portion 5B
3 is dropped from above into any two through-holes a formed in the side of the scaffold top 1 of the other stepladder 3, so that the second joint portion 5 </ b> B is connected to the side of the scaffold top 1. , And by folding the legs 2a located below the connecting portion by the first joint portion 5A to the non-use position as shown by the imaginary line to the solid line in FIG. A simple working scaffold of the T type (or L type) can be assembled.

Therefore, it is possible to assemble a simple work scaffold at a required place by straddling obstacles such as desks, cabinets, personal computers, and other fixtures placed in the room. Moreover, since the second joint portion 5B is connected to the side of the scaffold top 1 using the through holes a formed at a predetermined pitch in the scaffold top 1, any of the side portions of the scaffold top 1 It can be connected to any position, and it is possible to assemble a work scaffold corresponding to the layout of furniture such as T-shaped or L-shaped.

FIG. 6 shows another example of a stepladder connection device A according to the present invention. This stepladder connection device A is intended for connection of the stepladders 3 and 3 on which the hook locking brackets b are not provided at both ends in the longitudinal direction of the scaffold top plate 1, and is configured as follows. I have. That is, an upper plate portion 7a and a lower plate portion 7b, which protrude to one side in the width direction of the main body frame 4 and have pin holes 6a and 6b formed concentrically, are formed at both longitudinal end portions of the horizontally long main body frame 4. , Upper and lower plate portions 7a, 7b
The upper and lower plate portions 7 pass through the through holes a of the scaffold top plate 1 sandwiched therebetween.
a joint pin 8 that can be inserted and withdrawn through the pin holes 6a and 6b of the first and second joints 5a and 7b, and is configured to be connectable to the longitudinal end of the scaffold top plate 1 on one of the stepladders 3A.
And a protruding piece 12 protruding to the opposite side of the upper plate portion 7a, and a connecting pin 13 which is vertically attached to a tip end thereof and can be dropped into the through hole a from above. It is characterized in that a second joint portion 5B that is connectable to the side of the scaffold top 1 of the stepladder 3 is provided to constitute a stepladder connection device. The pitch of the connecting pins 8 and 13 is set to an integral multiple of the pitch of the through holes a.

According to this embodiment, the first joint portion 51A
Also, since the connection is made using the through-hole 1a of the scaffold top plate 1, the anti-sway projections 11 are unnecessary and are omitted. Other configurations and operations are the same as those of the above-described embodiment, and a description thereof will not be repeated.

[0022]

As described above, if the stepladder connecting device according to the present invention is used, the stepladder can be connected to, for example, a T-shaped or L-shaped stepladder.
The desks, cabinets, personal computers, and other fixtures placed indoors by placing the molds and the like at right angles to each other and connecting them, and folding the joints into two legs and three legs. It is possible to assemble a simple work scaffold at a required place across obstacles such as.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a stepladder connection device according to the present invention.

FIG. 2 is a perspective view of a stepladder connection device.

FIG. 3 is a vertical sectional side view in a use state of the stepladder connection device.

FIG. 4 is a plan view of the stepladder connection device.

FIG. 5 is a front view of the stepladder connection device.

FIG. 6 is a longitudinal sectional side view in a use state of another stepladder connection device according to the present invention.

[Explanation of symbols]

a: through hole, b: hook locking bracket, 1: scaffold top plate, 2a, 2b: leg, 3: stepladder, 4: body frame, 5
A: first joint portion, 5B: second joint portion, 6a, 6b: pin hole, 7a: upper plate portion, 7b: lower plate portion, 8: connecting pin, 13
... Connecting pins.

Claims (3)

[Claims] 1. A large number of through holes are formed at a predetermined pitch,
A rectangular scaffold top provided with a pair of hook locking brackets at both ends in the longitudinal direction, and a stepladder having legs foldably pivotally attached to both longitudinal ends of the scaffold top, A stepladder connecting device for arranging and connecting at right angles to each other, wherein pin holes are formed at both ends in a longitudinal direction of a horizontally long main body frame so as to protrude to one side in the width direction of the main body frame and are concentric. An upper plate portion and a lower plate portion, and a connecting pin that can be inserted and withdrawn through the pin holes of the upper and lower plate portions through the bracket interposed between the upper and lower plate portions, and a longitudinal end of the scaffold top plate on one stepladder. And a protruding piece protruding to the side opposite to the upper plate, and a connection that is vertically fixed to a tip end thereof and can be dropped into the through hole from above. A pin and the foot on the other stepladder Stepladder coupling device formed by providing a second joint portion that is configured to be connected to the side of the top plate. 2. A side surface of the main body frame on the side of the first joint portion,
2. The stepladder connecting device according to claim 1, further comprising a steadying projection that abuts on opposing side surfaces of the hook locking brackets on both sides. 3. A step scaffold having a rectangular scaffold top plate having a large number of through-holes formed at a predetermined pitch, and legs foldably pivotally mounted at both ends in the longitudinal direction thereof, at right angles to each other. What is claimed is: 1. A stepladder connecting device for arranging and connecting an upper plate portion having a pin hole formed concentrically at both ends in a longitudinal direction of a horizontally long main body frame in a widthwise direction of the main body frame. And a connecting pin which can be inserted and withdrawn through the through-holes of the scaffolding top plate sandwiched between the upper and lower plate portions and the pin holes of the upper and lower plate portions, and the longitudinal end of the scaffolding top plate on one stepladder A first joint portion configured to be connectable to the upper portion, a protruding piece protruding to the opposite side to the upper plate portion, and a vertically extending fixed portion at a tip portion thereof, which can be dropped into the through hole from above. And a connecting pin, which is connected to the side of the A stepladder connecting device including a second joint portion configured to be connectable.