JP2004224497A - Pit ladder for elevator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pit ladder for an elevator capable of remarkably reducing a projection area in a plane of a hoistway. <P>SOLUTION: This pit ladder for an elevator is provided with a first support 1 fixed to the inside the hoistway 7 and extended along the hoistway 7, a plurality of steps 3 provided with a space in the vertical direction of the hoistway 7 freely to turn around one end thereof in relation to the first support 1, and a second support 2 extended along the hoistway 7 opposite to the first support 1 and provided with the other end of the steps 3 freely to turn. The second support 2 is arranged to come close and separate to/from the first support 1 by moving in parallel with the first support 1. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an elevator pit ladder mounted in a pit of a hoistway.
[0002]
[Prior art]
Conventionally, in a pit ladder of an elevator, a pair of struts are provided close to the wall surface of the hoistway due to space limitations, so the effective foot width of steps when a maintenance person goes up and down the pit ladder is small, There was a problem that it was difficult to move up and down.
In order to solve such problems, a pair of pillars of the pit ladder are made movable with respect to the wall surface, and when an operator uses the pit ladder, the pit ladder is separated from the wall surface so that a maintenance person can easily go up and down. A pit ladder for an elevator has been proposed (for example, see Patent Document 1).
[0003]
[Patent Document 1]
JP-A-6-146760
[Problems to be solved by the invention]
However, in recent years, in order to arrange equipment conventionally housed in a machine room, such as a machine roomless elevator, in a hoistway, the projection area of the hoistway plane is reduced as much as possible with respect to a pit ladder in a pit. However, the elevator pit ladder has a problem in that the hoistway projected area of the pit ladder itself is not reduced, and thus it does not meet such a demand.
Further, in the above elevator pit ladder, the elevator pit ladder is provided on the wall side of the hoistway near the entrance of the landing, but when the worker puts his feet on the steps, he or she takes his feet from an unreasonable posture. There was also a problem that workability was poor.
Further, when the pit ladder of the elevator is moved, there is a problem that a large weight load is applied to the movement of the pit ladder.
[0005]
SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and can reduce the projected area of a hoistway plane, improve workability, and further reduce a load during handling. It is an object of the present invention to provide an elevator pit ladder that is reduced or the like.
[0006]
[Means for Solving the Problems]
A pit ladder for an elevator according to the present invention includes a first post fixed in a hoistway and extending along the hoistway, one end of which is rotatable with respect to the first post, and A plurality of steps provided at intervals in the vertical direction, a step facing the first column and extending along the hoistway, and rotatably provided at the other end of the step. A second post, wherein the second post approaches and separates from the first post in a parallel motion.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described, and the same, equivalent members, and portions will be described with the same reference numerals.
Embodiment 1 FIG.
FIG. 1 is a front view of a pit ladder of an elevator according to Embodiment 1 of the present invention, and FIG. 2 is a cross-sectional view taken along line II-II of FIG.
The pit ladder of this elevator is provided on the left side when viewing the inside of the hoistway 7 from the elevator landing side in FIG. 2 and extends along the hoistway 7 and has a first column 1 having a U-shaped cross section. A plurality of steps 3, one end of which is rotatable about the shaft 4 with respect to the first support 1 and is provided at intervals in the vertical direction of the hoistway; And a second column 2 having a U-shaped cross section and provided at the other end of the step 3 so as to be rotatable about a shaft 4. Are moved in a parallel motion toward and away from the first column 1.
The first support 1 is fixed to a guide rail 6 having a cross section “T” through a bracket 5.
[0008]
The second support column 2 is provided with a lever 8 that is rotatable about a shaft 4a. The shaft 4a also supports the step 3 rotatably. At the base end of the lever 8 is formed a stepped portion 8a which is a locking portion with a cut-out corner, and at the step 3 a pin 9 which is a locked portion locked by the locking portion 8a. The second column 2 approaches the first column 1 by locking the step 8 a to the pin 9 and rotating the lever 8.
A hook 12 is provided at the tip of the lever 8. The L-shaped hook 12 is urged by a spring 13 counterclockwise about a shaft 14.
[0009]
The first support 1 is provided with a U-shaped fitting 10. Further, a switch 11 for outputting a detection signal for restricting the operation of the elevator is provided on the first column 1 near the metal fitting 10, and when the second column 2 approaches the first column 1, The operation of the elevator can be performed by the lever 8 being in contact with the switch 11, and the operation of the elevator is stopped when the contact of the lever 8 with the switch 11 is released.
[0010]
In the elevator pit ladder having the above configuration, the second support column 2 can be made to approach the first support column 1 by rotating the lever 8 counterclockwise about the shaft 4a in FIG.
That is, by rotating the lever 8, the step 8a comes into contact with the pin 9 as shown in FIG. 3, and thereafter, as shown in FIG. 4, the lever 8 is rotated about the shaft 4b, With the rotation of the lever 8, the second support column 2 makes a parallel movement and finally approaches the first support column 1 as shown in FIG. 5.
During this approach, the tip of the hook 12, which has been prevented from rotating by the pin 15, jumps over the fitting 10 against the elastic force of the spring 13 and is locked to the fitting 10 (see FIGS. 6 and 7).
When the switch 11 is pressed by the pressing portion 8b protruding from the lever 8, the operation of the elevator is restarted.
[0011]
Thus, as shown in FIG. 8, the first support 1 and the second support 2 are located on the left side of the elevator from the landing side of the elevator, as shown in FIG. When trying to use the ladder, as shown in FIG. 9, the worker stands in front of the entrance of the landing and holds the lever 8 while pushing the protruding piece 12a of the hook 12 with the finger in the direction of arrow A in FIG. To release the hook 12 from the metal fitting 10. With this release, the second support 2 moves in parallel by its own weight and separates from the first support 1. The lever 8 also rotates about the shaft 4a by its own weight.
Since the hook 12 is released from the metal fitting 10 and the holding portion 8b is separated from the switch 11, the operation of the elevator cannot be used.
[0012]
In the elevator pit ladder having the above-described configuration, the base end of the lever 8 is provided on the second support 2 so as to be rotatable about the shaft 4a, and the step 8a is formed at the base end. The step 3 is provided with a pin 9 which is locked to the step 8a. By locking the step 8a to the pin 9 and rotating the lever 8, the second support 2 becomes the first support. 1, the lever 8 acts as a “lever” so that the second column 2 can be brought closer to the first column 1 with a small force.
Further, since the lever 8 is rotatably supported by the shaft 4a which rotatably supports the step 3, when the step 8a is locked by the pin 9, the step 3 is substantially linear with the lever 8. Since it is located on the upper side and acts as a "lever" together with the lever 8, the length of the arm is increased, and the second column 2 can be brought closer to the first column 1 with smaller force.
Although the step 8a is provided as the engaging portion and the pin 9 is provided as the engaged portion, a pin may be provided on the lever, and a step for engaging the pin may be provided in the step.
[0013]
A hook 12 urged in one rotation direction by a spring 13 is provided at the tip of the lever 8, a U-shaped fitting 10 is provided on the first support 1, and a second support 2 is provided on the first support 1. When the first column 1 approaches the first column 1, the tip of the hook 12 jumps over the metal 10 against the elastic force of the spring 13 and is locked to the metal 10, so that the second column 2 is connected to the first column 1. The hook 12 is automatically locked to the metal fitting 10 at the same time when the first support 1 is approached, and the second support 2 is integrated with the first support 1 in a state of approaching.
[0014]
Further, the first support 1 is provided with a switch 11 for outputting a detection signal for restricting the operation of the elevator. When the second support 2 approaches the first support 1, the lever 8 is connected to the switch 11. When the operator can use the pit ladder because the elevator can be operated by using the pit ladder because the elevator can be operated when the contact of the lever 8 with the switch 11 is released. Nothing is done.
[0015]
In addition, the first column 1 is provided on one side on the left and right when viewing the inside of the hoistway 7 from the landing side of the elevator, and the second column 2 is located on the entrance side of the hall when separated from the first column 1. Since the parallel movement is performed, the operator can easily touch the lever 8 from the entrance of the landing and can step on the step 3.
[0016]
【The invention's effect】
As described above, according to the pit ladder of the elevator according to the present invention, the first post fixed in the hoistway and extending along the hoistway, and one end portion rotates with respect to the first post. A plurality of steps freely and at intervals in the vertical direction of the hoistway; and a step facing the first support and extending along the hoistway, and A second post rotatably provided at an end, wherein the second post approaches the first post in a parallel motion and is separated from the first post. Therefore, the projected area of the hoistway plane can be reduced, and the degree of freedom in the layout of the elevator increases.
[Brief description of the drawings]
FIG. 1 is a front view of a pit ladder of an elevator according to Embodiment 1 of the present invention.
FIG. 2 is a sectional view taken along the line II-II in FIG.
FIG. 3 is a front view of the pit ladder of FIG. 1 in the process of being set to an unused state.
FIG. 4 is a front view of the pit ladder of FIG. 1 in the process of being set to an unused state.
FIG. 5 is a front view when the pit ladder of FIG. 1 is set in an unused state.
FIG. 6 is an enlarged view of a portion A in FIG. 5;
FIG. 7 is a plan view of FIG. 6;
FIG. 8 is a sectional view taken along the line VIII-VIII in FIG. 5;
9 is a diagram showing an arrangement of the pit ladder of FIG. 5 in a pit.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 1st support | pillar, 2nd support | pillar, 3 steps, 4 axis | shaft, 4a, 4b axis | shaft, 7 hoistway, 8 lever, 8a step part (engagement part), 9 pin (engaged part), 10 metal fittings , 11 switches, 12 hooks, 13 springs.

Claims (6)

A first post fixed in the hoistway and extending along the hoistway;
A step in which one end is rotatably provided with respect to the first support, and a plurality of steps are provided at intervals in a vertical direction of the hoistway;
A second strut facing the first strut and extending along the hoistway, and rotatably provided at the other end of the step;
A pit ladder for an elevator, the second stanchion being adapted to move in a parallel motion toward and away from the first stanchion. A base end portion of a lever is rotatably provided on the second post, and a locking portion is formed on the base end portion, and is locked by the locking portion in the step. 2. The second column is moved closer to the first column by providing a locked portion, and locking the locking portion to the locked portion and rotating the lever. 3. Elevator pit ladder as described. The pit ladder of an elevator according to claim 2, wherein the base end of the lever is rotatably supported on a shaft that rotatably supports the step. A hook urged in one rotation direction by a spring is provided at the tip of the lever, a U-shaped fitting is provided on the first support, and the second support is provided with a second support. The pit ladder of an elevator according to claim 2 or 3, wherein when approaching the first support, the tip of the hook jumps over the fitting against the elastic force of the spring and is locked to the fitting. . The first support is provided with a switch that outputs a detection signal for restricting the operation of the elevator, and when the second support approaches the first support, the lever comes into contact with the switch. The pit ladder of an elevator according to any one of claims 2 to 4, wherein the elevator can be operated, and when the contact of the lever with the switch is released, the elevator cannot be operated. The first support is provided on one of the right and left sides when viewing the inside of the hoistway from the landing side of the elevator, and the second support is located on the entrance side of the landing when separated from the first support The pit ladder of an elevator according to any one of claims 1 to 5, wherein the pit ladder moves in parallel.

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