JP2012035918A - Brake releasing device for elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a brake releasing device for an elevator that can obtain large operating force while miniaturizing the whole device and improve the working efficiency of release work.SOLUTION: A pressing mechanism 29 presses a traction body 27 between rotating rollers 25, 26 to apply tension to the traction body 27 and an inner wire 13 to thereby release a brake device 6. The pressing mechanism 29 includes a screw part 30 screwed into a threaded hole 24b; a handle part 31 for manually rotating the screw part 30; and a pressing body 32 inserted in a handle mounting part 24a so that the lower end of the screw part 30 abuts thereon.

Description

  The present invention relates to an elevator brake releasing device for manually releasing a brake device of a hoisting machine.

  During the operation of the elevator, the car may stop between the floors due to, for example, an earthquake, a power failure, or a failure. In such a case, a rescue operation for manually releasing the brake device of the hoisting machine from the landing and moving the car to the landing is performed. During the rescue operation, a brake release device temporarily installed at the landing is connected to the end of the brake wire drawn out to the landing.

  As a conventional brake release device, a type that pulls an inner wire of a brake wire by pushing down a foot lever is known. In this type, the foot pedal functions as a lever, and the pedaling force is increased according to the distance from the rotation center of the foot lever (for example, see Patent Document 1).

  As another conventional brake release device, a type in which an inner wire is pulled by operating a manually wound handle and winding an inner wire of a brake wire around a winding drum is known. In this type, the winding force is increased in accordance with the ratio between the length of the manual winding handle and the radius of the winding drum (see, for example, Patent Document 2).

JP 2001-233563 A Japanese Patent Laid-Open No. 2007-153587

  In order to release the brake device of a large hoisting machine, a force of several thousand N may be applied to the brake wire for operation over a stroke of several hundred mm. On the other hand, in the conventional foot release type brake release device, it is necessary to extend the foot release lever as the braking force of the brake device increases. For this reason, there existed a problem that a brake releasing apparatus will become large sized, weight will increase, and storage and conveyance will become difficult. In addition, there is a limit to the vertical height and pedaling force that people can step on, and there is a limit to increasing the size. On the other hand, in the conventional hand-wound handle type brake releasing device, the hand cannot be released from the hand-wound handle while releasing the brake, and the workability is poor.

  The present invention has been made in order to solve the above-described problems, and is capable of obtaining a large operating force while reducing the size of the whole, and an elevator brake capable of improving the workability of release work. The purpose is to obtain a release device.

  The brake release device for an elevator according to the present invention has a handle mounting portion provided with a screw hole, and a release device main body on which a flexible brake operation body connected to the brake device of the hoisting machine is stretched, And a screw part screwed into the screw hole, a handle part for manually rotating the screw part, and a pressing body that is displaced by screwing the screw part into the screw hole and presses the brake operating body. And a pressing mechanism for releasing the brake device by applying tension to the brake operating body by pressing the brake operating body.

  The brake release device for an elevator according to the present invention displaces the pressing body by screwing the threaded portion into the screw hole, thereby applying tension to the brake operation body and releasing the brake device. Obtainable. In addition, even if the hand is released from the handle part while the brake is released, the pressing state of the brake operating body by the pressing body is not released, the brake releasing state can be maintained, and the workability of releasing work is improved. be able to.

It is a side view which shows the installation state of the brake release apparatus of the elevator by Embodiment 1 of this invention. It is a front view which shows the winding machine of FIG. It is sectional drawing of the brake release apparatus of FIG. It is sectional drawing of the brake release apparatus of the elevator by Embodiment 2 of this invention.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
Embodiment 1 FIG.
1 is a side view showing an installation state of an elevator brake release device according to Embodiment 1 of the present invention. In the figure, a hoisting machine 2 is installed in a pit 1 a of a hoistway 1. Suspension means (not shown) for suspending a car 3 and a counterweight (not shown) in the hoistway 1 is wound around the hoisting machine 2. A rope or a belt is used as the suspension means. The car 3 and the counterweight are moved up and down in the hoistway 1 by the hoisting machine 2.

  When the car stops between the floors for some reason and performs a manual rescue operation, the brake release device 4 is temporarily installed at the landing on the lowest floor. A brake wire 5 is connected to the brake release device 4. The brake wire 5 has a first end connected to the hoisting machine 2 and a second end connected to the brake release device 4 by being pulled out to the landing during the rescue operation.

  FIG. 2 is a front view showing the hoisting machine 2 of FIG. The hoisting machine 2 includes a drive sheave around which suspension means is wound, a hoisting machine motor that rotates the drive sheave, and a brake device 6 that brakes the rotation of the drive sheave. The brake device 6 includes a cylindrical brake drum (brake rotator) 7 that rotates together with the drive sheave, and a pair of brake main bodies 8 that are disposed inside the brake drum 7.

  Each brake body 8 includes a movable iron core 9 that can be displaced in the radial direction of the brake drum 7, a brake shoe 10 that is mounted on the movable iron core 9 and that is in contact with and separated from the inner peripheral surface (braking surface) of the brake drum 7, A brake spring that presses 10 against the brake drum 7 and an electromagnetic magnet 11 that pulls the brake shoe 10 away from the brake drum 7 against the brake spring by attracting the movable iron core 9.

  During normal operation, by passing a current through the brake coil of the electromagnetic magnet 11, the electromagnetic magnet 11 is excited and the brake shoe 10 is pulled away from the brake drum 7. As a result, the braking force of the brake device 6 is released. Further, by energizing the brake coil, the excitation of the electromagnetic magnet 11 is released, and the brake shoe 10 is pressed against the brake drum 7 by the spring force of the brake spring. Thereby, the rotation of the brake drum 7 is braked or the stationary state of the brake drum 7 is maintained.

  The brake wire 5 has an outer tube 12 and an inner wire 13 passed through the outer tube 12. A first hoisting machine side wire attachment plate 14 is fixed to the movable iron core 9 of one brake body 8. A second hoisting machine side wire attachment plate 15 is fixed to the movable iron core 9 of the other brake body 8. These wire attachment plates 14 and 15 are arranged in parallel to each other.

  The tip of the inner wire 13 is connected to the first hoisting machine side wire mounting plate 14. The distal end portion of the outer tube 12 is connected to the second hoisting machine side wire attachment plate 15. During the rescue operation, by pulling out the inner wire 13 from the outer tube 12 on the second end side of the brake wire 5, the distance between the wire mounting plates 14 and 15 is reduced on the first end side of the brake wire 5. The brake shoe 10 is pulled away from the brake drum 7.

  FIG. 3 is a cross-sectional view of the brake release device 4 of FIG. The U-shaped base 21 is installed on the floor of the hall. On the base (support base) 21, a release device side wire mounting plate 22 is fixed perpendicularly to the upper surface of the base 21. The end portion of the outer tube 12 is fixed to the wire attachment plate 22 via a pair of nuts 23. These nuts 23 are screwed to the end fittings of the outer tube 12 with the wire attachment plate 22 interposed therebetween.

  A frame 24 is fixed on the base 21. A cylindrical handle mounting portion 24 a is provided at the center of the frame 24. The handle mounting portion 24a is provided with a screw hole 24b. The axis of the screw hole 24 b is perpendicular to the upper surface of the base 21. An opening 21 a is provided in a portion of the base 21 that faces the handle mounting portion 24 a.

  Inside the frame 24 on the base 21, a first rotating roller 25 as a first receiving portion and a second rotating roller 26 as a second receiving portion are arranged with an opening 21a interposed therebetween. Yes. The release device main body 28 includes a base 21, a wire attachment plate 22, a frame 24, and rotating rollers 25 and 26.

  A flexible traction body 27 as a brake operation body is in contact with the outer peripheral surfaces of the rotary rollers 25 and 26. As the traction body 27, a wire (traction wire) having higher flexibility than the inner wire 13 is used.

  A base end portion (left end portion in the figure) of the tow body 27 is fixed to the frame 24. A tow hook 27 a to which the end of the inner wire 13 is connected is fixed to the tip of the tow body 27. The traction body 27 is connected to the end portion of the inner wire 13 during the rescue operation and is stretched on the release device main body 28.

  A pressing mechanism 29 that presses the traction body 27 is mounted on the handle mounting portion 24a. The pressing mechanism 29 is manually operated to press the traction body 27 between the rotating rollers 25 and 26, apply tension to the traction body 27 and the inner wire 13, and release the brake device 6.

  The pressing mechanism 29 is inserted into a screw portion (screw rod) 30 screwed into the screw hole 24b, a handle portion (manual winding handle) 31 for manually rotating the screw portion 30, and a handle mounting portion 24a. And a pressing body 32 with which the lower end portion of the screw portion 30 is in contact.

  The handle portion 31 is provided with a handle 31a. A spherical seat 30 a that contacts the upper end surface of the pressing body 32 is provided at the lower end portion of the screw portion 30. The pressing body 32 includes a sliding member 33 that is slidably inserted into the handle mounting portion 24 a and a pressing roller 34 that is attached to the lower portion of the sliding member 33 and presses the traction body 27.

  By rotating the handle portion 31 and screwing the screw portion 30 into the screw hole 24b, the pressing body 32 is displaced in a direction protruding from the handle mounting portion 24a, and the pulling body 27 is pressed by the pressing roller 34. The pressing direction of the pulling body 27 by the pressing roller 34 is a direction orthogonal to a straight line connecting both end portions of the pulling body 27.

  Further, when the threaded portion 30 is loosened, the inner wire 13 is pulled back to the hoisting machine 2 side by the spring force of the brake spring, the brake shoe 10 is pressed against the brake drum 7, and a braking force is applied to the brake drum 7.

  During the rescue operation, the operator operates the handle portion 31 to release the braking force of the brake device 6, and the car 3 is raised or lowered by an unbalanced load between the car 3 side and the counterweight side. When the car 3 is moved to the nearest stop floor, the brake device 6 is braked by the operation of the handle portion 31, and the car 3 is stopped.

  In such a brake release device 4, the screw portion 30 is screwed into the screw hole 24 b to displace the pressing body 32, thereby applying tension to the traction body 27 and releasing the brake device 6. An operating force can be obtained, and it can be applied to release the brake of the large hoisting machine 2.

  Further, even if the hand is released from the handle portion 31 while the brake is released, the pressing state of the traction body 27 by the pressing body 32 is not released, and the brake releasing state can be maintained. Can be improved.

  Further, since the pulling body 27 having higher flexibility than the inner wire 13 is connected to the inner wire 13 and this pulling body 27 is pressed by the pressing roller 34, even when the inner wire 13 is relatively hard, a small brake release is possible. The device 4 can apply tension to the inner wire 13.

  Furthermore, since the screw part 30 and the pressing body 32 are comprised by another member, even if the screw part 30 is rotated, the pressing body 32 can be displaced in the axial direction without rotating.

  Note that the traction body 27 is not necessarily a wire, and may be, for example, a belt shape or a sheet shape.

Embodiment 2. FIG.
Next, FIG. 4 is a sectional view of an elevator brake release device according to Embodiment 2 of the present invention. In the figure, an inner wire connecting portion 35 for connecting an end portion of the inner wire 13 is provided on the base 21. The inner wire connecting portion 35 faces the wire mounting plate 22 with the frame 24 interposed therebetween.

  The release device main body 28 according to the second embodiment includes a base 21, a wire attachment plate 22, a frame 24, rotating rollers 25 and 26, and an inner wire connecting portion 35. The brake operating body of the second embodiment is the brake wire 5, and the inner wire 13 of the brake wire 5 is stretched on the release device main body 28. Further, the pressing roller 34 presses the inner wire 13 between the rotating rollers 25 and 26. The pressing direction of the inner wire 13 by the pressing roller 34 is a direction orthogonal to a straight line connecting the position of the inner wire 13 on the wire mounting plate 22 and the position of the inner wire 13 on the inner wire connecting portion 35. Other configurations are the same as those in the first embodiment.

  Thus, if the inner wire 13 has a certain degree of flexibility, the inner wire 13 may be directly pressed without using the traction body 27 as in the first embodiment, and the same effect as in the first embodiment. Can be obtained.

In the first and second embodiments, the pressing body 32 having the pressing roller 34 is shown. However, the pulling body 27 and the inner wire 13 may be pressed by the spherical seat 30a of the screw portion 30, for example. That is, the pressing body does not necessarily need to be configured separately from the threaded portion.
In the first and second embodiments, the rotating rollers 25 and 26 are shown as the first and second receiving portions. However, the present invention is not limited to this. For example, the traction body 27 and the inner wire 13 are arranged along the outer peripheral surface. The guide member may be slid.

Further, in the first and second embodiments, the case where the brake release device 4 is used by being installed on the floor of the landing has been described. However, for example, it may be used by being installed vertically in a landing wall or a landing operation panel.
Furthermore, in the first and second embodiments, the case where the brake release device 4 is connected to the brake wire 5 during the rescue operation has been shown. It can also be accommodated.

Moreover, although Embodiment 1 and 2 showed the case where the hoisting machine 2 was installed in the pit 1a, the installation place of the hoisting machine 2 is not limited to this, For example, the hoistway 1 It may be installed on the top. In this case, for example, the brake release device 4 may be installed at the hall on the top floor.
Further, in the first and second embodiments, the brake body 8 is disposed inside the brake drum 7, but the brake release device of the present invention can also be applied to a brake device of a type disposed on the outside. .
Furthermore, the number of brake bodies 8 is not limited to two sets, but may be one set or three or more sets.
In the first and second embodiments, the drum-type brake device 6 is shown, but the brake release device of the present invention can also be applied to a disc brake.

  2 hoisting machine, 4 brake releasing device, 5 brake wire (brake operating body), 24a handle mounting part, 24b screw hole, 25 first rotating roller (first receiving part), 26 second rotating roller (first 2 receiving part), 27 traction body (brake operating body), 28 release device main body, 29 pressing mechanism, 30 screw part, 31 handle part, 32 pressing body.

Claims (5)

A release device main body having a handle mounting portion provided with a screw hole and having a flexible brake operation body connected to a brake device of a hoisting machine, and a screw screwed into the screw hole Part, a handle part for manually rotating the screw part, and a pressing body that is displaced by screwing the screw part into the screw hole and presses the brake operating body. A brake release device for an elevator, comprising: a press mechanism that applies a tension to the brake operation body by pressing to release the brake device. The release device main body is provided with first and second receiving portions that are arranged at a distance from each other and receive the brake operation body,
The brake release device for an elevator according to claim 1, wherein the pressing body presses the brake operating body between the first receiving portion and the second receiving portion. A traction body is connected to the release device body as the brake operation body,
The brake release device for an elevator according to claim 1 or 2, wherein the traction body is connected to a brake wire connected to the brake device and is stretched on the release device main body.   4. The elevator brake release device according to claim 3, wherein the traction body is more flexible than the brake wire.   The brake release device for an elevator according to claim 1 or 2, wherein a brake wire connected to the brake device is connected and stretched to the release device body as the brake operation body.

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