JP2001106448A - Stop holder of elevator car - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stop holder of an elevator car stopping including a limit switch capable of being held in the open condition certainly even if the shape, material, etc., of a level and/or switch box are change resulting from an improvement of fall limiting device. SOLUTION: This stop holder 8 of an elevator car is installed removably on a fall limiting device 5 fixed to a guide rail 2 through a bracket 7 for holding a lever 5B in the specified attitude so as to keep a limit switch in a switch box 5C in the open condition and is composed of a roller receptacle 9 to make engagement with a roller 5A at the tip of the lever 5B, a part to be engaged 11 to be engaged with one side of a long hole 7A in the bracket 7, and a coupling part 10 having a specified length interposed between the members 9 and 11. When the roller 5A is inserted to the roller receptacle 9 and the part to be engaged 11 is engaged with the bracket 7, the receptacle 9 holds the roller 5A in the specified position against the returning force of the lever 5B, so that the holding tool 8 can keep the limit switch in the open condition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator car stop holder which is used to ensure safety when working at the bottom of a hoistway or the like.

[0002]

2. Description of the Related Art When working at the bottom of a hoistway of an elevator, a serious accident may occur if the car is lowered too much. Therefore, an existing lowering limit device that operates when the car reaches a predetermined height position to stop the car is utilized, and a substantially L-shaped plate-shaped member is attached to the lowering limit device to make the car lower. Is disclosed in Japanese Patent Application Laid-Open No. 10-87195, in which the safety of the hoistway bottom part operation is ensured by keeping the stationary state. In addition, the lowering limit device rotates when a part of the car (cam body) comes into contact with a roller portion at the tip of the limit switch, which outputs a signal for stopping the car when opened, and rotates against its own returning force. It is schematically constituted by a lever that is driven to open the limit switch, and a switch box that supports the lever and the limit switch, and is fixed to the car guide rail via a bracket.

In the prior art described in Japanese Patent Application Laid-Open No. H10-87195, the plate-like member is attached in a state where the plate-like member is engaged with a switch box and a lever of a descent restricting device. The switch box can prevent the lever from returning automatically through the switch. Therefore, by attaching the plate-like member to the descent restricting device and holding the lever in a predetermined posture, the restriction switch can be kept open and the work at the bottom of the hoistway can be performed safely. Become.

[0004]

The prior art described above is
This does not cause any particular problem when it is attached to the currently widely used lowering limiter.However, if the switch box is downsized due to the improvement of the lowering limiter, or if the lever is changed from a rotating type to a retractable type, it will be applied. There was a problem that it became impossible. Also, in the conventional technology,
The magnet attached to the plate-shaped member is magnetically attracted to the side surface of the switch box so that the plate-shaped member is not dropped by its own weight, but when a plastic switch box is adopted, the magnet is removed. Since the magnetic attraction cannot be performed, a drop accident of the plate-shaped member easily occurs at the time of attachment and detachment.

[0005] The present invention has been made in view of such problems of the prior art, and an object of the present invention is to change the limit switch even if the shape and material of the lever and the switch box are changed due to the improvement of the lowering device. It is an object of the present invention to provide an elevator car stop holder which can be reliably held in an open state.

[0006]

In order to achieve the above-mentioned object, the present invention provides a limit switch for outputting a signal for stopping a car at the time of opening, and a part of the car is provided at a roller portion at a tip end. When the contact is made, the lever is driven to rotate against the self-restoring force to open the limit switch, and the guide rail for guiding the elevator operation of the car is fixed via a bracket to the limit switch and the lever. An elevator car stop holder that is detachably attached to a lowering limiter having a switch box that supports the elevator and that can hold the lever in a predetermined position to keep the limit switch in an open state; The lower limit device has a roller receiving portion engageable with the roller portion, and a locked portion engageable with the bracket, and the locked portion is attached to the bracket. In a state in which sealed, and to hold the roller portion in a predetermined position the roller receiving portion against the return force of the lever.

By using the car stop holder having such a configuration, it is possible to hold the roller portion at the tip of the lever at a predetermined position with respect to the bracket even when the shape and size of the descent restricting device are different. Become. That is, even if the lever of the descent restricting device is of a rotating type or a retractable type, or even if the switch box is downsized, the roller portion when pushed into a part of the car (cam body) Since the retreat amount is the same, even if the type of descent limit device is different,
When the roller section has been retracted by a predetermined amount, the limit switch must be reliably opened. Therefore, if a car stop holder that can hold the roller portion and the bracket in a connected state is used,
The roller portion can be held at a position retracted by a predetermined amount without being affected by the shape and size of the descent restricting device. Therefore, this car stop holding tool has versatility applicable even if the descent restricting device is variously improved, and can keep the restriction switch open.

In addition, if the car stop holder is provided with a magnet for magnetically attracting the bracket to the bracket, it is possible to reliably prevent a drop of its own weight, which is a concern when attaching and detaching the car stop holder. In this case, since the object to be magnetically attracted is not the descent restricting device but a bracket, there is no problem even if the material of the switch box is changed to plastic or the like.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a perspective view showing a state in which the car stop holder according to the present embodiment is attached to the descent restricting device, FIG. 2 is an external view of the car stop holder,
FIG. 3 is a schematic vertical sectional view showing a main part of the bottom of the hoistway, FIG. 4 is a plan view showing a relative positional relationship between the lowering limit device and the car, and FIG. FIG.

As shown in FIGS. 3 to 5, a relatively small elevator is usually provided with a descent restricting device 5 at the bottom of the hoistway 1 for stopping the traveling of the car 3. The lowering device 5 includes a lever 5B having a roller portion 5A at its tip and being elastically urged in one direction.
And a limit switch (not shown) which is disposed in the switch box 5C and outputs a signal for stopping the car 3 when opened. . Also, the lowering limiter 5
When attaching the switch box 5C, the switch box 5C is fixed to a predetermined portion of the guide rail 2 having a substantially U-shaped cross section for guiding the raising and lowering operation of the car 3 via the bracket 7 and the extension bracket 6. That is, the extension bracket 6 is fastened and fixed to the elongated hole 2A of the guide rail 2, and the bracket 7 is fastened and fixed to the extended bracket 6. The switch box 5C of the descent restricting device 5 is fitted to the elongated hole 7B of the bracket 7. Fastened and fixed.

Next, the operation of the above-described descent restricting device 5 will be described. Now, when the car 3 descends to a predetermined height position close to the shock absorber 4 installed at the bottom of the hoistway 1, the cam 3A of the car 3 is lowered
, And the lever 5B is pushed into the cam body 3A against its own returning force. When the lever 5B is rotationally driven by a predetermined amount, the limit switch is opened, a car stop signal is output, and the traveling of the car 3 is stopped.

The car stop holder 8 according to this embodiment is
As shown in FIGS. 1 and 2, the roller portion 5A of the descent restricting device 5
A roller receiving portion 9 which can be positioned by inserting one side of the roller receiving portion, a connecting portion 10 having a predetermined length formed to extend laterally from one side end of the roller receiving portion 9, and a counter roller receiving portion of the connecting portion 10. 9 and a hook-shaped locked portion 11 that can be engaged with one side of the elongated hole 7A of the bracket 7. The roller receiving portion 9 includes a contact surface 9a that contacts the roller portion 5A from the pressing direction of the cam body 3A, and a contact surface 9a.
a restricting surface 9b extending obliquely upward from a, and a lower restricting surface 9c extending diagonally downward from the contact surface 9a.
And the contact surface 9a so as to face the distal end portion of the connecting portion 10.
And a side regulating surface 9d extending laterally from
The connecting portion 10 and the side regulating surface 9d are bent substantially at right angles to the contact surface 9a.

[0013] The car stop holder 8 having the above-described configuration is configured such that the roller portion 5A at the tip end of the lever 5B of the descent restricting device 5 is inserted into the roller receiving portion 9, and the hook-shaped locked portion 1 is held.
When 1 is hooked on one side of the long hole 7A of the bracket 7,
Since the returning force of the lever 5B which is going to return to the left in FIG. 1 acts on the contact surface 9a of the roller receiving portion 9, the locked portion 11 urged in the same direction via the connecting portion 10
Is locked. In this state, the distance between the roller portion 5A and the long hole 7 is defined by the connecting portion 10 to a predetermined length. That is, the car stop holder 8 holds the roller portion 5A at a predetermined position and regulates the rotation angle of the lever 5B.
It can be easily and reliably attached to the bracket 7. In the present embodiment, the length of the connecting portion 10 is set such that the lever 5B is rotated to a position sufficient to open the limit switch when the roller portion 5A is held at the predetermined position by the car stop holder 8. The limit switch can be kept open by attaching the car stop holder 8.

The above-mentioned car stop holder 8 is used by being attached to the descent restricting device 5 when an operator works on the bottom of the hoistway 1 as shown in FIG. That is, when the worker enters the bottom of the hoistway 1, first, the roller receiving portion 9
The roller part 5A of the descent restricting device 5 is inserted into the
The locked portion 11 is locked to one side of the long hole 7 of the bracket 7 while rotating against the returning force. As a result, the car stop holding tool 8 is interposed between the roller portion 5A and the elongated hole 7 and can keep the limit switch in the open state. Various operations can be performed at the bottom of the hoistway 1. Further, once the car stop holder 8 is attached in this manner, the locked portion 11 is pressed against one side of the long hole 7 and securely locked by the return force of the lever 5B as described above, so that the car stops. There is no fear that the holder 8 will come off unintentionally.

In addition, the car stop holder 8 can be manufactured at a low cost by bending a metal plate or the like, and is easy to handle because it is small and lightweight. Further, the car stop holder 8 has a wide application range, and even when the shape and size of the descent restricting device 5 are different, the roller portion 5A at the tip of the lever 5B is also used.
Can be held at a predetermined position with respect to the bracket 7. That is, even when the lever 5B of the descent restricting device 5 is not of the rotating type as in the present embodiment but is of the retractable type or the switch box 5C is downsized, the cam body 3
Since the retraction amount of the roller portion 5A when pushed into the roller A is the same, even if the type of the descent restricting device 5 is different, the roller portion 5A
If A has retracted a predetermined amount, the limit switch must be reliably opened. Therefore, the roller portion 5A and the bracket 7
By using the car stop holder 8 capable of holding the roller unit 5A in a connected state, the roller unit 5A is held at a position retracted by a predetermined amount without being affected by the shape and size of the descent restricting device 5,
The limit switch can be kept open.

If a magnet plate (not shown) is attached to the back surface of the connecting portion 10 of the car stop holder 8 so that it can be magnetically attracted to the bracket 7, there is a concern when the car stop holder 8 is attached or detached. It is possible to reliably prevent the falling of its own weight. In this case, the target to be magnetically attracted is the bracket 7 instead of the descent restricting device 5, so that the switch box 5
Even if the material of C is changed to plastic or the like, no problem occurs.

In the embodiment described above, the roller 5
Although the distance between A and the elongated hole 7 is uniquely determined by the connecting portion 10 having a predetermined length, if the connecting portion 10 which is formed by combining a plurality of members and whose total length can be changed is used, the type of the descent restricting device 5 , The roller portion 5A can be held at a desired position, so that the applicable range of the car stop holder 8 can be further expanded. For example, the first connecting portion extending from the roller receiving portion 9 and the second connecting portion extending from the locked portion 11 are slidably overlapped and connected, and the connecting portion is connected. If the slide amount can be selected by appropriately changing the length, the length of the connecting portion 10 can be changed.

[0018]

The present invention is embodied in the form described above and has the following effects.

The lower limit device has a roller receiving portion that can be engaged with a roller portion at the tip of a lever, and a lower portion that can be engaged with a bracket that fixes the lower limit device to a guide rail. In a state where the locking portion is locked to the bracket, the roller receiving portion is a cage stop holding device configured to hold the roller portion at a predetermined position against the returning force of the lever, so that the lever of the descent restricting device is The limit switch can be kept open by using the same car stop holding device regardless of whether it is a rotating type, a retractable type, or the size of the switch box is reduced. In other words, this car stop holder has the versatility that it can be applied even if the shape and size of the descent restricting device are different, and it can be manufactured small and light and easy to carry. It is easy to use when performing, and by attaching this to the descent restricting device, the car can be stopped to ensure safety during work.

Further, it is preferable that a magnet for magnetically attracting the bracket is attached to the cage for holding the car, since the self-weight drop, which is a concern when attaching and detaching the cage for holding, can be reliably prevented. . In this case, since the object to be magnetically attracted is not the descent restricting device but a bracket, there is no problem even if the material of the switch box is changed to plastic or the like.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state in which a car stop holder according to an embodiment of the present invention is attached to a descent restricting device.

FIG. 2 is an external view of the car stop holder.

FIG. 3 is a schematic longitudinal sectional view showing a main part of a hoistway bottom part.

FIG. 4 is a plan view showing a relative positional relationship between the lowering limit device and a car;

FIG. 5 is a perspective view showing a relative positional relationship between the lowering device and a car;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hoistway 2 Guide rail 3 Car 5 Lowering limiter 5A Roller part 5B Lever 5C Switch box 7 Bracket 8 Car stop holder 9 Roller receiving part 10 Connecting part 11 Locked part

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takashi Yamasoh 1-6-6 Kandanishikicho, Chiyoda-ku, Tokyo F-term in Hitachi Building Systems Co., Ltd. 3F002 CA03 GB02 3F304 BA02 BA22

Claims (3)

[Claims] A limit switch for outputting a signal to stop the car when the car is opened; and a limit switch which is driven to rotate against a return force of the car when a part of the car comes into contact with a roller portion at the tip end. It can be attached to and detached from a lowering limiter that includes a lever that opens a switch, and a switch box that is fixed via a bracket to a guide rail that guides the elevator operation of the car and that supports the limit switch and the lever. A car stop holder for an elevator, which is attached to the elevator and is capable of holding the lever in a predetermined posture to keep the limit switch in an open state, a roller receiving portion engageable with the roller portion of the descent restricting device, A latched portion engageable with the bracket, and in a state where the latched portion is latched to the bracket, the roller receiving portion is configured to return the lever with a returning force. Car stop retainer elevator, characterized in that so as to hold the roller portion in a predetermined position by anti. 2. The device according to claim 1, further comprising a connecting portion having a predetermined length provided between the roller receiving portion capable of controlling the position by inserting the roller portion and the hook-shaped locked portion,
When the locked portion is attached to one side portion of the long hole of the bracket by inserting the roller portion into the roller receiving portion, the return force of the lever acts on the roller receiving portion, and the locked portion is actuated. The elevator car stop holder is characterized in that the elevator is stopped by the bracket, and the interval between the roller portion and the elongated hole is defined to a predetermined length by the connecting portion. 3. The elevator car stop holding tool according to claim 1, wherein a magnet for magnetically attracting the bracket is attached to the bracket.