JP2009057189A - Brake release device for elevator hoisting machine, and elevator system with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a brake release device capable of releasing a brake provided in an elevator hoisting machine by smaller operating force. <P>SOLUTION: A sheave 23 is turnably supported in a displacing member 21 of a brake release device 20, and an inner wire 6b of an operation wire 6 is wrapped around the sheave 23. With this structure, when the inner wire 6b is pulled forward, the sheave 23 works as a running block and displaces the displacing member 21 forward. A brake 3 can be thereby released by the operating force half of the operating force of a conventional brake release device. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a device for manually releasing an elevator hoisting machine brake in an emergency, and more particularly to a technique for improving the brake so that the brake can be released with a smaller operating force.

Conventionally, an elevator hoist has been provided with a brake. When the car is moved up and down, the brake is electromagnetically released by energizing the brake so that the traction sheave can rotate.
As a result, if the brakes cannot be energized due to a power failure, etc., the brakes will remain active and the car will not be able to be raised or lowered, so the rescue operation of landing the car stopped between the floors on the nearest floor It is necessary to release the brake manually.
Therefore, a brake release device for manually releasing the brake during rescue operation has been proposed by the applicant of the present application (see Patent Documents 1 and 2 below).

The structure of this brake release device will be outlined with reference to FIGS. 13 and 14. The hoisting machine 2 provided at the top of the elevator hoistway 1 is provided with a brake 3, and the wall surface of the hall hall 4 on the uppermost floor. An operation wire 6 extending from an operation lever 5 provided on the control lever 5 is connected.
As a result, when the brake remains activated due to a power failure or the like and the car 7 cannot be raised or lowered, the rescue worker operates the operation lever 5 to manually release the brake.
Then, the traction sheave 8 can rotate, and the car 7 naturally rises or falls due to the weight imbalance between the car 7 and the counterweight 9, so that the car 7 can be landed on the nearest floor. it can.

JP 2004-307181 A JP 2007-62900 A

  By the way, as shown in FIG. 14, the brake 3 of the hoisting machine 2 described above includes a pair of front and rear brake arms 12 supported by swinging shafts 10 and 11 extending horizontally in the left-right direction so as to freely swing in the front-rear direction. 13 and a displacement member 14 on which upper ends 12a and 13a of these brake arms are pivotally supported.

A pair of left and right frames 15 a and 15 b fixed to the upper portion of the hoisting machine 2 is attached with a U-shaped bracket 16 in plan view, and the distal end of the outer tube 6 a of the operation wire 6 is secured by a locking tool 17. It is connected.
Further, the inner wire 6b of the operation wire 6 is connected to the rear end upper portion 14a of the displacement member 14 by a locking tool (not shown).
As a result, when the worker performing the rescue operation operates the operation lever 5 and pulls the inner wire 6b, the displacement member 14 is displaced forward as indicated by the arrow A, and the brake arms 12 and 13 swing. The brake 3 can be released.

At this time, since the pair of front and rear brake arms 12 and 13 are always urged toward the brake operating side by an urging means (not shown), when the brake 3 is released, the displacement member 14 is operated with an operating force exceeding a predetermined value. Needs to be displaced forward.
Further, since the operation wire 6 extends while curving from the hall on the top floor to the hoisting machine 2 provided at the top of the hoistway, there is no sliding between the outer tube 6a and the inner wire 6b. Frictional force accompanying movement acts.
Thereby, a rescue worker who rescues the car 7 must operate the operation lever 5 with a large force.

  Furthermore, since the hoisting machine 2 is provided at the top of the hoistway, it is difficult for a rescue worker to visually recognize the operating state of the brake 3 from the hall hall 4 on the top floor.

  Therefore, the object of the present invention is to solve the above-mentioned problems of the prior art, not only to release the brake provided in the elevator hoisting machine with a smaller operating force, but also to easily visually check the operating state of the brake. It is an object of the present invention to provide an improved brake release device.

The means described in claim 1 for solving the above problem is as follows.
A device for releasing an elevator hoisting machine brake using an operating means in an emergency,
A pulley body that is supported by a displacement member that is displaced when the brake is released, and that is displaced together,
A linear body that extends from the operation means and is wound around the outer peripheral portion of the pulley body, and has its tip locked to the hoisting machine,
When the operation means is operated to draw the linear body, the pulley body acts as a moving pulley, and the displacement means is displaced to release the brake.

In other words, the brake hoist release device for an elevator hoist according to claim 1 does not directly displace the linear member to the brake displacement member by the linear member as in the conventional brake release device, but the linear member is moved to the outer periphery of the pulley body. The displacement member is displaced by using the pulley as a “moving pulley”.
As a result, the brake can be released by displacing the brake displacement member with half the operating force compared to the conventional brake release device.
Note that the sheave as the “moving pulley” is not limited to one. For example, two sheaves can be used to act as a “double moving pulley”.

The pulley body can be a circular sheave and a wire operated by an operating lever provided with a linear body in the hall on the top floor.
Also, the pulley can be a sprocket and the linear body can be a chain.
Furthermore, it is also possible to adopt a structure in which a wire or chain as a linear body is attracted by a battery-driven electric actuator.
In addition, the electric actuator can be provided with a control means that can be operated from a monitoring center that remotely monitors the operation of the elevator.

The pulley body can be supported rotatably with respect to the displacement member via a rolling bearing or a slide bearing, or can be fixed to the displacement member so as not to rotate.
When the pulley body is fixed to the displacement member and does not rotate, the linear body slides on the outer periphery of the pulley body, but means for reducing friction on the surface of the portion where the linear body slides, For example, it is preferable to apply a low friction material or grease containing polytetrafluoroethylene or molybdenum disulfide.
Alternatively, a thin plate formed from a low friction resin material such as polytetrafluoroethylene may be attached to the outer periphery of the pulley body, and the linear body may slide on the thin plate.

Since the pulley body only needs to be able to wind the linear body over about a half circumference, it can also be formed in a semicircular shape instead of a perfect circle.
In this case, the manufacturing cost can be reduced by pressing the pulley body from a sheet metal material or by injection molding from a low friction resin material as compared with a sheave manufactured by machining.

  Furthermore, if a light reflecting material such as a light reflecting member or a light reflecting tape attached to the rear part of an automobile or a bicycle is applied to the sliding body, a lighting device such as a flashlight is provided. By using it, the forward and backward movement of the sheave, that is, the released state of the brake can be easily visually recognized from the operation means side.

Furthermore, by covering the periphery of the pulley body with a cover member, it is possible to prevent an operator who inspects the hoisting machine and the brake release device from inadvertently touching the pulley body and releasing the brake, It is possible to prevent malfunction due to adhesion of the like.
At this time, if the cover member is made of a transparent material, the rotating state of the pulley body, and hence the brake released state, can be easily visually recognized from the hall on the top floor.

In addition, the pulley body can be provided with urging means for returning the pulley body body to a predetermined swing position where the displacement member of the brake is not displaced.
This prevents the inner wire from returning due to the sliding friction between the outer tube of the operation wire and the inner wire, and can reliably prevent the brake from being released due to the displacement member of the brake being left displaced. .

  According to the present invention, there is provided an improved brake release device that not only can release a brake provided in an elevator hoisting machine with a smaller operating force but also can easily recognize the operating state of the brake. Can be provided.

  Hereinafter, with reference to FIG. 1 thru | or FIG. 12, each embodiment and each modification of the brake releasing apparatus of the elevator hoisting machine of this invention and an elevator system provided with the same are demonstrated in detail. In the following description, the same reference numerals are used for the same parts including the above-described conventional apparatus, and a duplicate description is omitted.

1st Embodiment First, with reference to FIGS. 1-3, the brake release apparatus of 1st Embodiment and an elevator system provided with the same are demonstrated.

The elevator system 100 of 1st Embodiment is equipped with the hoisting machine 2 arrange | positioned at the top part of the elevator hoistway 1 similarly to the prior art shown in FIG.
The hoisting machine 2 is provided with a brake 3 so that the traction sheave 8 can be braked in a non-rotatable manner.
And the operation wire 6 extended from the operation lever 5 provided in the wall surface of the hall | hole 4 of the top floor is connected to this brake 3 via the brake releasing apparatus 20 shown in FIGS.

As shown in FIGS. 1 to 3, the brake release device 20 includes a displacement member 21 on which the upper ends of a pair of front and rear brake arms 12 and 13 of the brake 3 are pivotally supported. As indicated by the arrow C, when the displacement member 21 is displaced forward, the brake 3 is released and the traction sheave 8 can be rotated.
A support shaft 22 extending upward is projected from the rear end of the displacement member 21, and a sheave 23 is supported so as to be rotatable around a rotation axis extending in the vertical direction.

Further, a bracket 24 having a U-shaped cross-section is attached to the support shaft 22 to surround the sheave 23 in the left-right direction, and the inner wire 6b of the operation wire 6 is prevented from falling off from the outer peripheral groove 23a of the sheave 23. .
Further, a light reflector 25 is suspended from an end of the bracket 24 on the side visible from the hall hall 4 on the top floor.

Further, the front end of the outer tube 6 a of the operation wire 6 is connected to the locking member 17 on the right end side of the U-shaped bracket 26 in a plan view spanned between the front end portions of the left and right frames 15 a and 15 b of the hoisting machine 2. It is locked by.
Further, on the left end side of the bracket 26, the front end of the inner wire 6 b of the operation wire 6 that is wound around the sheave 23 and extends in a U shape is locked by a locking tool 18.

Accordingly, when the operation lever 5 provided on the wall surface of the hall hall 4 on the uppermost floor is operated and the inner wire 6b is pulled forward as shown by an arrow B in FIG. 3, the sheave 23 is “moving pulley”. As shown by the arrow C, the displacement member 21 is displaced forward.
Then, the pair of front and rear brake arms 12 and 13 swing around the support shafts 10 and 11, so that the brake 3 of the hoisting machine 2 is released and the traction sheave 8 can be rotated.

At this time, the magnitude of the force that the sheave 23 displaces the displacement member 21 forward is twice the force that displaces the inner wire 6 b forward by the operation lever 5.
Therefore, compared with the conventional brake releasing device shown in FIG. 13, the magnitude of the operating force applied to the operating lever 5 to release the brake 3 is only half.

Further, as shown in FIG. 1, a light reflector 25 is attached to an end portion of a bracket 24 surrounding the sheave 23 in the left-right direction.
As a result, when an operator operating the operation lever 5 in the hall hall 4 on the top floor irradiates the light to the hoisting machine 2, the sheave 23 is moved back and forth, and thus the operating state of the brake 3 is easily visually confirmed. can do.

2nd Embodiment Next, with reference to FIG. 4 and FIG. 5, the brake release apparatus 30 of 2nd Embodiment and the elevator system 110 provided with the same are demonstrated.

  In the brake release device 20 of the first embodiment described above, the sheave rotates around an axis extending in the vertical direction. However, in the brake release device 30 of the second embodiment, the brake release device 30 is horizontal in the left-right direction. The sheave rotates around an axis extending in the direction.

More specifically, the brake release device 30 includes a displacement member 31 on which upper ends of a pair of front and rear brake arms 12 and 13 of the brake 3 are pivotally supported.
A support portion 31a extending upward is protruded from the rear end of the displacement member 31, and a support shaft 32 extending horizontally to the right is attached to the upper end of the support portion 31a to move the sheave 33 in the left-right direction. Is supported so as to be rotatable about an axis extending horizontally.

Further, a bracket 34 having a U-shaped cross section is attached to the support shaft 32 to surround the sheave 33 in the vertical direction, and the inner wire 6b of the operation wire 6 is prevented from dropping from the outer peripheral groove 33a of the sheave 33. .
Furthermore, a light reflector 35 is attached to the upper end side of the bracket 34.

Further, the front end of the outer tube 6 a of the operation wire 6 is connected to the lower end of the U-shaped bracket 26 in a plan view spanned between the front end portions of the pair of left and right frames 15 a and 15 b of the hoisting machine 2 by a locking tool 17. It is locked.
In addition, the front end of the inner wire 6 b of the operation wire 6 that is wound around the sheave 33 and extends in a U-shape is locked to the upper end of the bracket 26 by a locking tool 18.

As a result, when the operation lever 5 provided on the wall surface of the hall hall 4 on the top floor is operated and the inner wire 6b is pulled forward as shown by an arrow B in FIG. As shown by the arrow C, the displacement member 31 is displaced forward.
Then, the pair of front and rear brake arms 12 and 13 swing around the support shafts 10 and 11, so that the brake 3 of the hoisting machine 2 is released and the traction sheave 8 can be rotated.

At this time, the magnitude of the force that the sheave 33 displaces the displacement member 31 forward is twice the force that displaces the inner wire 6 b forward by the operation lever 5.
Therefore, compared with the conventional brake releasing device shown in FIG. 13, the magnitude of the operating force applied to the operating lever 5 to release the brake 3 is only half.

Further, as shown in FIG. 4, a light reflector 35 is attached to the upper end portion of the bracket 34 that surrounds the sheave 33 in the vertical direction.
As a result, when an operator operating the operating lever 5 in the hall hall 4 on the top floor irradiates the light to the hoisting machine 2, the sheave 33 is moved back and forth, and thus the operating state of the brake 3 is easily visually confirmed. can do.

First Modification Next, with reference to FIG. 6, a modification of the brake release device 20 of the first embodiment described above will be described.

The brake release device 40 of the first modification is an urging means for returning the sheave 23 to a predetermined position where the displacement member 21 is not displaced with respect to the brake release device 20 of the first embodiment shown in FIG. Is added.
More specifically, a tension coil spring 42 extending in the front-rear direction is attached to the bracket 41 fixed to the upper portion of the hoisting machine 2.
The front end of the tension coil spring 42 is connected to the upper end of the support shaft 22 that rotatably supports the sheave 23.

As a result, the sheave 23 is always urged by the tension coil spring 42 and tends to be displaced rearward, and pulls the inner wire 6b of the operation wire 6 rearward.
Therefore, the inner wire 6b does not return while being pulled forward due to the sliding friction between the outer tube 6a and the inner wire 6b of the operation wire 6, and the brake 2 is released while the displacement member 21 remains displaced forward. Can be reliably prevented.

Second Modified Example Next, a modified example of the brake release device 30 of the second embodiment described above will be described with reference to FIG.

The brake release device 50 of the second modification shown in FIG. 7 has a structure in which the entire brake release device 30 of the second embodiment shown in FIG. 4 is covered with a transparent cover member 51.
As a result, it is possible to prevent an operator who inspects the hoisting machine 2 from inadvertently touching the sheave 33 or the like to release the brake 3, and dust is attached to the sheave 33 or the like, resulting in malfunction. This can be surely prevented.
Further, since the light reflector 35 attached to the upper end of the bracket 34 can be visually recognized through the transparent cover member 51, the state of the bracket 34 and therefore the brake 3 can be easily changed from the hall hall 4 on the top floor. It can be visually recognized.

3rd Embodiment Next, with reference to FIG. 8, the brake release apparatus 60 of 3rd Embodiment and the elevator system 300 provided with the same are demonstrated.

The brake release device 20 of the first embodiment described above has a structure in which the inner wire 6b is wound around the single sheave 23 provided on the displacement member 21 by a 2: 1 type of routing.
In contrast, the brake release device of the third embodiment has a structure in which the inner wire 6b is wound around the pair of left and right movable sheaves provided on the displacement member by a 4: 1 type of routing.

More specifically, a pair of left and right movable sheaves 63 and 64 are rotatably supported by a bracket 62 fixed to the displacement member 61.
A fixed sheave 66 is rotatably supported by a bracket 65 fixed to the U-shaped bracket 26 in plan view.
The inner wire 6 b of the operation wire 6 is wound around the right-side movable sheave 63, the fixed sheave 66, and the left-side movable sheave 64 in this order, and the tip thereof is locked to the bracket 26 by the locking tool 18.

As a result, when the operation lever 5 provided on the wall surface of the hall hall 4 on the top floor is operated and the inner wire 6b is pulled forward as shown by an arrow B in FIG. 8, a pair of left and right movable sheaves 63, 64 acts as a “double moving pulley” to displace the displacement member 61 forward as indicated by an arrow C.
Then, the pair of front and rear brake arms 12 and 13 swing around the support shafts 10 and 11, so that the brake 3 of the hoisting machine 2 is released and the traction sheave 8 can be rotated.

At this time, the magnitude of the force that causes the pair of left and right movable sheaves 63 and 64 to displace the displacement member 61 forward is four times the force that displaces the inner wire 6 b forward by the operation lever 5.
Therefore, as compared with the conventional brake release device shown in FIG. 14, the magnitude of the operation force applied to the operation lever 5 to release the brake 3 is only one-fourth.

Third Modification Next, a sheave support structure in the brake release device 20 of the first embodiment and a modification thereof will be described with reference to FIGS.

As shown in FIG. 9, the sheave 23 in the brake release device 20 of the first embodiment is rotatably attached to the support shaft 22 via a ball bearing 27.
On the other hand, in the modification shown in FIG. 10, the sheave 23 is rotatably supported with respect to the support shaft 22 via a slide bearing 28.
The sliding bearing may be a resin cylindrical member impregnated with, for example, a lubricating oil or a metallic cylindrical member impregnated with a solid lubricant such as molybdenum disulfide.

Furthermore, in the modified example shown in FIG. 11, the sheave 23 is fitted to the support shaft 22 and cannot rotate.
Therefore, the inner wire 6b of the operation wire 6 slides on the surface of the groove 23a of the sheave 23. However, since the grease containing molybdenum disulfide is applied to the surface of the outer peripheral groove 23a, the operation of the inner wire 6b is hindered. There is nothing.

In addition, in the modification shown in FIG. 12, the sheave 71 formed in a substantially semicircular shape is fitted to the support shaft 22 and cannot rotate.
At this time, the manufacturing cost of the sheave 71 can be reduced as compared with a sheave manufactured by machining, for example, by pressing from a sheet metal material or by injection molding from a low friction resin material.
Further, by attaching a thin plate of a low-friction resin material such as polytetrafluoroethylene to the groove 71a of the sheet metal sheave 71, the inner wire 6b can be configured to smoothly slide thereon. .

As mentioned above, although each embodiment and each modification of a brake release device of an elevator hoisting machine concerning the present invention and an elevator system provided with it were explained in detail, the present invention is not limited by the embodiment mentioned above, Various changes are possible.
For example, in the brake release devices 20 and 30 shown in FIGS. 1 and 2, the light reflectors 25 and 35 are attached to the brackets 24 and 34 surrounding the sheaves 23 and 33.
On the other hand, the light reflectors 25 and 35 can be directly attached to the sheaves 23 and 33 themselves.

1 is a perspective view showing a brake release device according to a first embodiment and an elevator system including the same. FIG. 2 is a side view of the brake release device and the hoisting machine shown in FIG. 1. The principal part top view of the brake release apparatus and hoist shown in FIG. The side view of the brake release apparatus and hoisting machine of 2nd Embodiment. The principal part top view of the brake release apparatus and hoist shown in FIG. The principal part top view of the brake release apparatus and hoisting machine of a 1st modification. The side view of the brake release apparatus and hoisting machine of a 2nd modification. The principal part top view of the brake release apparatus and hoisting machine of 2nd Embodiment. The principal part cross-sectional side view which shows the support structure of a sheave. The principal part cross-sectional side view which shows the modification of the support structure of a sheave. The principal part cross-sectional side view which shows the modification of the support structure of a sheave. The top view which shows the modification of a sheave. The side view which shows the whole brake release apparatus structure of the conventional elevator hoisting machine. The perspective view which shows the principal part of the brake release apparatus of the conventional elevator hoisting machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Elevator hoistway 2 Hoisting machine 3 Brake 4 Hall hall 5 Operation lever 6 Operation wire 7 Ride car 8 Traction sheave 9 Balance weight 10, 11 Brake spindle 12, 13 Brake arm 14 Displacement member 15a, 15b Frame 16 Bracket 20 Brake release device 21 of the first embodiment 21 Displacement member 22 Support shaft 23 Sheave 24 Bracket 25 Light reflector 27 Ball bearing 28 Slide bearing 30 Brake release device 31 Displacement member 32 Support shaft 33 Sheave 34 Bracket 35 of the second embodiment Light Reflector 40 Brake Release Device of First Modification 41 Bracket 42 Tension Coil Spring 50 Brake Release Device of Second Modification 51 Cover Member 60 Brake Release Device of Third Embodiment 61 Displacement Member 62 Bracket 63, 64 Movable Sheave 65 Brake DOO 66 fixed sheave 65 coil spring (biasing means)
71 Sheave 100 Elevator system 110 having the brake release device of the first embodiment Elevator system 200 having the brake release device of the first modified example Elevator system 210 having the brake release device of the second modified example of the second modified example Elevator system 300 provided with a brake release device Elevator system provided with a brake release device according to a third embodiment

Claims (12)

A device for releasing an elevator hoisting machine brake using an operating means in an emergency,
A pulley body that is supported by a displacement member that is displaced when the brake is released, and that is displaced together,
A linear body that extends from the operation means and is wound around the outer peripheral portion of the pulley body, and has its tip locked to the hoisting machine,
The elevator hoisting machine is configured so that when the linear member is pulled by operating the operating means, the pulley body acts as a moving pulley, and the displacement means is displaced to release the brake. Machine brake release device.   The brake release device for an elevator hoist according to claim 1, wherein the pulley body is a circular sheave and the linear body is a wire.   The brake release device for an elevator hoisting machine according to claim 1, wherein the pulley body is rotatably supported by the displacement member via a rolling bearing.   The brake release device for an elevator hoisting machine according to claim 1, wherein the pulley body is rotatably supported by the displacement member via a slide bearing.   2. The pulley according to claim 1, wherein the pulley is fixed so as not to rotate with respect to the displacement member, and the linear body is configured to slide on an outer periphery of the pulley. The brake release device of the elevator hoist described.   6. The brake hoisting device for an elevator hoisting machine according to claim 5, wherein friction reducing means is provided on a surface of a portion of the pulley body where the linear body slides.   The elevator hoisting machine according to claim 5 or 6, wherein the pulley body is a semicircular sheave having an outer peripheral portion around which the linear body is wound, and the linear body is a wire. Brake release device.   2. The brake hoisting device for an elevator hoist according to claim 1, wherein the pulley has a light beam reflecting means provided at a position that can be viewed from the operation means side.   The brake release device for an elevator hoisting machine according to claim 1, further comprising a cover member that covers the pulley body.   The brake release device for an elevator hoist according to claim 9, wherein the cover member is made of a transparent material.   The brake hoisting device for an elevator hoisting machine according to claim 1, further comprising urging means for returning the pulley body to a predetermined position where the displacement member is not displaced.   An elevator system comprising the brake release device for an elevator hoist according to any one of claims 1 to 11.

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