JPH06146760A - Foldable ladder - Google Patents

Abstract

PURPOSE:To enhance the safety during maintenance and inspection work by forming a bending part in a middle part of a leg to fix a post with a wall surface of a lift passage of an elevator. CONSTITUTION:In the case where maintenance inspection is carried out to check a pit by stopping an elevator, a worker in charge of maintenance work stretches the worker's hand from an entrance 1 and removes a hook 22c from a step 7 at the uppermost stage of a ladder. As a result, a post 6 drops downward by its self weight and a bending part 9c is separated from a wall surface 8, centering on a pin 12 while the post 6 is separated from a switch 20a, thereby turning on a safety switch 20 and cutting off an operation circuit 21. A ladder is fixed at the point of time when the bottom of the post 6 comes into contact with a pit floor surface 2. At that time, the bending part 9c is turned in a completely extended state. After work, the post 6 is pushed against the wall surface 8 and the hook 22 is mounted to the step 7 on the uppermost stage so that the ladder is fixed with the wall surface 8. At that time, the safety switch 20 is turned off while the operation circuit 21 is switched on. This constitution makes it possible to increase an effective space for scaffolding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foldable ladder, and more particularly, it is fixed in a gap between a car wall of an elevator and a wall surface of a hoistway, and a stepping width of a step and an effective footrest width are set to be large to ensure safety of work. It is about improving.

[0002]

2. Description of the Related Art FIGS. 6 and 7 are a front view and a sectional view showing a conventional pit inspection ladder. 6 and 7, A
Is a hoistway formed in the building to pass the elevator, 1 is an entrance / exit where maintenance personnel enter and exit to perform maintenance and inspection of the equipment (usually, the elevator on the lowest stop floor corresponds to this) 1a is a floor surface of the entrance / exit 1, 2 is a pit floor surface located at the bottom of the hoistway A, 3 is a shock absorber provided on the pit floor surface 4, and 4 is a controller for adjusting the elevator ascending / descending speed ( A regulator rope (not shown), 5 is a sheave for winding the regulator rope 4, 6
Is a pair of columns extending vertically from the floor surface 1a of the doorway 1 to the area where the feet of the maintenance personnel can reach and the floor surface 2 of the pit, and 7 is a step extending in parallel between these columns 6. ,
8 is a wall surface of the ascending / descending passage A, 9 is a leg portion for fixing the column 6 to the wall surface 8, L is a step width of step 7, and M is an effective width for stepping formed by the wall surface 8 and step 7. .

Here, the conventional pit inspection ladder is constructed as described above, and in using the ladder, a maintenance worker steps on the uppermost step 7 from the floor surface 1a of the doorway 1 and steps on the step 7. Get down to the pit floor 2 and inspect the shock absorbers 3 etc. Then, after the inspection, step 7
Go up the ladder while stepping on and go out from the doorway 1.

[0004]

Since the conventional pit inspection ladder is constructed as described above, there are the following problems. That is, the gap between the car wall of the elevator and the wall of the hoistway is very narrow due to its structure. Therefore, when a conventional fixed ladder is installed in the hoistway, it is difficult to increase the step width L of the step and the effective footrest width M, which is generally small. There was a serious problem of falling down.

The present invention has been made in order to solve the above problems, and in particular, a foldable ladder in which the stepping width of the step and the effective width of the footrest are increased to improve the work safety. The purpose is to get.

[0006]

[Means for Solving the Problems] Claim 1 according to the present invention
The foldable ladder in is composed of a pair of struts, steps extending in parallel between the struts, and legs extending between the wall of the elevator passage and the struts. In a foldable ladder, a folding part formed at an intermediate part of the leg part and changing a distance between the pillars with respect to the wall surface, and a fixing part fixed to the wall surface, and the folding part is bent to place the pillar on the wall surface. It is configured to turn off the operation circuit of the elevator by cooperating with the pillar when approaching, and to turn off the operation circuit of the elevator when the folding part is extended to separate the pillar from the wall surface. With a safety switch.

[0007]

In the folding ladder according to the first aspect of the present invention, by bending the folding portion formed in the middle portion of the leg portion, the support column can be brought close to the wall surface of the hoistway, and the folding portion can be almost straight. By extending to
The support pillar can be separated from the wall surface of the ascending / descending path, and a large effective width for hanging can be secured. Then, when the pillar is taken in and out of the wall surface, the operating circuit of the elevator can be turned on or off by the safety switch synchronized with the movement of the pillar.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a folding ladder according to the present invention will be described below with reference to the drawings. The same or equivalent parts as those of the conventional example are designated by the same reference numerals.

Embodiment 1. 1 is a perspective view showing a state in which a folding ladder according to a first embodiment of the present invention is pulled out,
FIG. 2 is a perspective view showing a state in which the folding ladder is stored. 1 and 2, 6 is a pair of columns, 7 is a step extending in parallel between the columns, 9 is a leg portion extending between the column 6 and the wall surface 8 of the ascending / descending passage A, and 10 is a pit floor. A guide rail fixed to the surface 2 and extending in the longitudinal direction of the hoistway A, 11
Is a mounting bracket fixed to the guide rail 10 by welding or the like and extending in a substantially horizontal direction.

The leg portions 9 form a pair in the horizontal direction, and are constituted by two upper and lower stages.
It is provided with a first leg piece 9a pivotally attached to the bracket 11 and a second leg piece 9b pivotally attached to the support portion 14 welded to the bracket 11 via a pin 15. The first leg piece 9a and the second leg piece 9b are configured to be bendable by the pin 12, and as a result, the bent portion 9c is formed in the middle portion of the leg portion 9. Further, the pin 12 is provided on the first leg piece 9a.
Regulating piece 1 for regulating the amount of rotation of the second leg piece 9b around the
6 is integrally provided. The restricting piece 16 is formed on the top surface of the first leg piece 9a and allows the leg portion 9 to be mountain-folded.

A safety switch 20 is fixed to the wall surface 8 of the ascending / descending passage A via a bracket 21. The safety switch 20 is provided with a rod-shaped switch portion 20a protruding so as to face one side surface (side surface facing the wall surface 8) 6a of the column 6. The switch section 20a is freely movable in and out of the switch body 20b.
When 0a is pushed in, the elevator driving circuit 21
Is a turn-on state, and when the switch part 20a is pushed out by a spring or the like, the elevator drive circuit 21 is turned off (see FIG. 5). One end of a wiring housing pipe 20c extending to the elevator operation circuit 21 is fixed to the switch body 20b.

A ladder accommodating device 22 for securely fixing the ladder to the wall surface 8 when the ladder is folded is fixedly mounted on the bracket 21. The ladder accommodating device 22 is provided with a key-shaped hooking piece 22b that is configured to be rotatable with respect to a main body 22a fixed to the bracket 21. A hook portion 2 for engaging with the uppermost step 7 when the ladder is folded is provided at the tip of the hanging piece 22b.
2c is formed.

Next, the operation of the folding ladder according to the present invention will be described. First, when the elevator is stopped and the pit is to be inspected for maintenance, the maintenance worker extends his / her hand from the doorway 1 and removes the hook portion 22c from the uppermost step 7 of the ladder in the state shown in FIGS. As a result, the column 6 falls downward due to its own weight and separates from the wall surface 8 while the bent portion 9c extends around the pin 12. Then, the support part 6 is separated from the switch part 20a, so that the switch part 20a becomes B
Moving in the direction, the safety switch 20 is turned on. That is, as shown in FIG. 5, the contacts 20d of the safety switch 20 are separated from each other, and the driving circuit 21 is turned off. The ladder is fixed when the bottom surface of the pillar 6 contacts the pit floor surface 2,
As shown in FIG. 4, with the bent portion 9c completely extended,
The effective width M of the footrest can be increased.

In this state, the operating circuit 21 is automatically shut off by the safety switch 20 and the safety of the maintenance personnel is ensured. Therefore, the maintenance personnel step on step 7 and step down to the pit floor surface 2. . Then, after the work is completed, it goes up to the doorway 1 along the ladder. After that, the column 6 is pressed against the wall surface 8, and when the ladder finally reaches the state of FIG. 3, the hook portion 22c is hooked on the uppermost step 7 to fix the ladder to the wall surface 8. At this time, the switch portion 20a is pressed in the direction of arrow C by the side surface 6a of the column 6, and the safety switch 20 is turned off. That is, as shown in FIG. 5, the contacts 20d of the safety switch 20 are electrically connected to each other to turn on the operation circuit 21. In addition, only when the operation relay 23 connected to another safety device is in the ON state,
The elevator can be operated.

The present invention is not limited to the above-described embodiment, and the support portion 14 provided on the leg portion 9 is not fixed to the mounting bracket 11 but directly fixed to the wall surface 8 of the hoistway A. Good. It goes without saying that the safety switch 20 may be directly fixed to the wall surface 8 without being fixed to the bracket 21.

[0016]

In the folding ladder according to the first aspect of the present invention, the folding portion is formed in the middle portion of the leg portion for fixing the support to the wall surface of the elevator passage.
When the elevator is operating normally, the folded part is bent so that the ladder is stored in a narrow space between the car wall and the wall of the hoistway, and the extended part can be extended during maintenance to increase the effective width of the legs. . Also, due to the folding structure of the ladder, the width of the steps can be made large, so there is very little problem that maintenance personnel slip and fall when moving up and down, and it is possible to greatly improve the safety when moving up and down. it can. In addition, the safety switch fixed to the wall of the hoistway and the pillar of the ladder cooperate with each other to turn off the elevator operation circuit when the pillar is bent to bring the pillar closer to the wall of the hoistway. When the ladder is folded, the prop that moves when the ladder is folded can be used effectively because the elevator operation circuit is turned off when the part is extended and the prop is separated from the wall of the hoistway. The operation circuit of the elevator does not operate during the use of the vehicle, and there is an excellent effect that the safety of the maintenance personnel can be ensured.

[Brief description of drawings]

FIG. 1 is a perspective view showing a state in which a folding ladder according to the present invention is pulled out.

FIG. 2 is a perspective view showing a state in which the folding ladder of the present invention is accommodated.

FIG. 3 is a side view showing the relationship between the accommodated folding ladder and a safety switch.

FIG. 4 is a side view showing the relationship between the retractable foldable ladder and the safety switch.

FIG. 5 is a diagram showing a safety circuit of an elevator.

FIG. 6 is a front view showing a conventional ladder.

FIG. 7 is a sectional view showing a conventional ladder.

[Explanation of symbols]

 A Lifting passage 6 Support 7 Step 8 Wall 9 Leg 9c Break 20 Safety switch 21 Operating circuit

Claims (1)

[Claims] 1. A foldable structure comprising a pair of pillars, steps extending in parallel between the pillars, and legs extending between a wall surface of a hoistway of an elevator and the pillars. In the formula ladder, a bent portion that is formed in an intermediate portion of the leg portion and that changes a distance between the pillars with respect to the wall surface; and a fixed portion that is fixed to the wall surface, and the bent portion is bent to bring the pillar closer to the wall surface. The safety circuit is configured to turn off the elevator driving circuit by cooperating with the support column when turning off the elevator operating circuit when the bent portion is extended to separate the support column from the wall surface. A foldable ladder characterized by having a switch.