JP2006206217A - Rail holding mechanism and safety means for elevator using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rail holding mechanism capable of surely holding a rail with stable contact even in the case wherein a clearance between a guide rail and a lining is uneven in both sides of the guide rail because of an offset load. <P>SOLUTION: This rail holding mechanism is provided with a pair of arms 11 held by a fixed shaft 14 freely to rotate in relation to an elevator car, a spring 15 arranged to move the arms in a direction for narrowing a clearance between the opposite lining, a pair of links rotatably connected to the other end of the arm, and a rod 18 turnably connected to the tip of a movable shaft 23 to be reciprocated by a driving device 22. The rod and the pair of links are turnably connected to each other at one position. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a rail gripping mechanism that grips a guide rail to stop and hold an elevator car, and an elevator safety device using the rail gripping mechanism.

In a conventional elevator safety device, a car is braked or held stationary by pressing a lining provided facing a side surface of a guide rail against the guide rail by a compression spring via an arm. The safety device is released by exciting an electromagnet (driving device) fixed to the lower part of the car and attracting the movable part against the compression spring. In addition, the safety device is held in a housing suspended by a plurality of bolts on the cage (see, for example, Patent Document 1).
In addition, in other conventional elevator safety devices, rollers that roll on the side surfaces of the guide rail are provided for the brackets on both sides of the guide rail so that the entire safety device can rotate around the pins. It is made possible to cope with the bending of the rails (for example, see Patent Document 2).

JP-A-3-216477 (pages 2 and 3, FIGS. 1 and 2) JP-A-9-52679 (page 4, line 4-50 to page 5, line 5-4, FIG. 1)

  Conventionally, an elevator safety device for gripping a guide rail has been installed mainly on a counterweight equipped with a linear motor in a linear elevator. Since the counterweight does not move the center of gravity during travel and does not need to consider vibration during travel related to ride comfort, the guide that supports the load of the counterweight uses a highly rigid guide, and the rail and lining The gap fluctuation is not large. On the other hand, the guide that guides the car along the rail while supporting the load at the top, bottom, left, and right of the car is given elasticity to improve the ride comfort. For this reason, the car is inclined with respect to the rail due to the unbalanced load of the car. Therefore, when a safety device is mounted on the car, the gap between the lining and the rail must be large. Also, the rail position while the car is running constantly changes with respect to the lining. On the other hand, in the conventional elevator safety device described in Patent Document 1, the arm can move only symmetrically with respect to the movement of the electromagnet. There was a problem that it could not be gripped reliably. On the other hand, in the conventional elevator safety device described in Patent Document 2, since the entire safety device rotates about its axis, the electromagnet is always shaken, and fatigue deterioration of power lines, signal lines and the like becomes a problem.

  The present invention has been made to solve the above-described problems, and even when the gap between the guide rail and the lining is not uniform on both sides of the guide rail due to the offset load, it can be stably contacted and securely gripped. It is an object of the present invention to provide an elevator safety device in which the rail gripping mechanism that can be operated and the stroke of the driving device do not change and the dimensional error is small.

  The rail gripping mechanism according to the present invention is rotatably supported by a fixed shaft with respect to a car, and a pair of arms with linings attached to the ends so as to face both side surfaces of the guide rail, and a gap between the facing linings A spring arranged to move the arm in the direction of narrowing, a pair of links rotatably connected to the other end of the arm, and a pivotally connected to the tip of a movable shaft that reciprocates by a driving device And a rod and a pair of links that are pivotally connected at one place.

  The elevator safety device according to the present invention includes a guide rail gripping mechanism, a permanent magnet that holds most of the reaction force of the spring in the released state of the safety device, and a movable element that holds the movable element facing the reaction force of the spring. It has an electromagnetic coil that moves and holds a part of the reaction force of the spring in the released state of the safety device, a magnetic path for the permanent magnet consisting of a permanent magnet and a stator and a mover, and an electromagnetic consisting of only the stator and the mover A drive device in which a magnetic path for a coil is divided is provided.

The present invention can widen the gap between the rail and the lining, and even if the gap between the guide rail and the lining is not uniform on both sides of the guide rail due to the unbalanced load by the passengers in the car, the lining hits the guide rail. Provided is a rail gripping mechanism that can stably contact without being reliably gripped.
In addition, even when the gap between the guide rail and the lining is not uniform on both sides of the guide rail due to the unbalanced load by the passengers in the car, the stroke of the drive device does not change, and an elevator safety device with little dimensional error can be provided. . Further, it is possible to provide an elevator safety device that consumes less power during normal travel.

Embodiment 1 FIG.
FIG. 1 is an overall configuration diagram of a car showing the arrangement of an elevator safety device according to Embodiment 1 of the present invention, FIG. 2 is a perspective view showing the elevator safety device according to Embodiment 1 of the present invention, and FIG. FIG. 4 is a side view showing an elevator safety device according to Embodiment 1 of the present invention, and FIG. 5 is an elevator safety device according to Embodiment 1 of the present invention. FIG. 6 is a mechanism diagram showing a rail gripping state of the elevator safety device according to the first embodiment of the present invention, and FIG. 7 is a drive of the elevator safety device according to the first embodiment of the present invention. It is a block diagram which shows an apparatus.
As shown in FIG. 1, a total of four elevator safety devices 4 including a guardrail gripping mechanism and a driving device according to the first embodiment are arranged above and below the car frame 3. A guide 5 is attached to the brake frame 1 or the block 10 to support an uneven load of the car and prevent the car from deviating from the rail. The safety device 4 may be composed of two units only on the upper side or two units only on the lower side. Further, the car room 6 is fixed to the car frame 3 via a vibration isolating rubber 7 to prevent the vibration from the car frame 3 from being directly transmitted to the car room 6.
The pedestal 13 having the lining 12 fixed to the front end of the arm 11 so as to face both side surfaces of the guide rail 2 can be slidably moved on the surface of the spherical seat 30 via the spherical seat 30 and the spherical nut 33. It is installed by a leaf spring 34.
A through hole that penetrates the fixed shaft 14 is formed in the middle of the arm 11 and closer to the lining 12 than the center, and is held rotatably around the fixed shaft 14 with respect to the block 10 fixed to the brake frame 1. The
A shaft 19 that is rotatably connected to the link 17 is passed through the other end of the arm 11. At both ends of the link 17, through-holes penetrating the shaft 19 and the shaft 20 are formed, and the shaft 20 is rotatably connected to the rod 18.
One end of the rod 18 is provided with a spring stopper 16 which can be adjusted in the axial direction by an adjusting screw 31, and the other end on the opposite side of the rod 18 is a movable shaft 23 and a shaft 21 of a driving device 22 fixed to the brake frame 1. It is connected by rotation freely.
The rod 18 includes a link side rod 18a connected to the left and right links 17 by a shaft 20, a movable shaft side rod 18b connected to the movable shaft 23 and the shaft 21, and a connecting member 18c that connects these rods by screw connection. Composed. Male ends of the link-side rod 18a and movable shaft-side rod 18b are threaded in opposite directions, and a female thread is threaded into the connecting member 18c. Thereby, the length of the rod 18 can be adjusted by rotating the connecting member 18c, and the angle of the arm 11, that is, the gap of the lining 12 can be adjusted.
The links 17 attached to the left and right arms 11 with the guide rail 2 interposed therebetween are connected by a shaft 20 so as to project outward toward the guide rail 2. Accordingly, the left and right links 17 and the rod 18 form an arrow shape toward the guide rail 2.
The spring 15 is sandwiched in a compressed state between a spring seat 10 a provided in the middle of the two fixed shafts 14 in the block 10 and a spring stopper 16 attached to the tip of the rod 18, and the movable shaft 23 of the driving device 22 is movable. It is arranged to expand and contract in the direction.
A collar 10 b protrudes from the block 10 so as to surround the upper and lower sides of the base 13.
A stopper bolt 32 is attached to the brake frame 1 to prevent the arm 11 from opening more than a specified angle.

With the configuration as described above, the force of the spring 15 is transmitted to the lining 12 via the link 17 and the arm 11, and the elevator car frame 3 can be held or restrained by friction with the guide rail 2. Further, when the gap between the guide rail 2 and the lining 12 is not uniform on both sides of the guide rail 2 due to an unbalanced load by the passengers in the cab 6, the left and right arms as shown by the two-dot chain line in FIG. 11 is in contact with the guide rail 2 at different angles, and the connecting portion of the left and right links 17 deviates from the driving direction of the driving device 22 but can be followed by the rotation of the rod 18. Even when the arm 11 does not move vertically with respect to the guide rail 2 or when the car frame 3 is inclined with respect to the guide rail 2, the spherical seat 30 slides on the spherical nut 33, and the pedestal 13 Since the position with respect to the arm 11 can be finely adjusted in all directions, the lining 12 does not come into contact with the guide rail 2 and comes into stable surface contact.
Since the pedestal 13 receives the load in the vertical direction applied to the safety device 4 in contact with the collar 10b of the block 10, an excessive load is not applied to the fixed shaft 14, and the arm 11 can be smoothly rotated.
Further, since the driving device 22 is fixed to the car frame 3 via the brake frame 1, there is no fear of fatigue deterioration of the power supply lines and signal lines connected to the driving device 22.

  In the first embodiment, the block 10 and the driving device 22 are fixed to the car frame 3 via the brake frame 1, but may be directly fixed to the car frame 3 without the brake frame 1.

  In the first embodiment, the left and right links 17 are outwardly convex toward the guide rail 2 in order to reduce the length in the longitudinal direction, but are oppositely convex, that is, inwardly convex. It is also good.

  FIG. 7 shows an example of a drive device for an elevator safety device that grips a rail using this mechanism. The drive device 22 holds most of the force that resists the force of the spring 15 at the time of releasing the brake with a permanent magnet, and holds the remaining force and the force necessary for preventing malfunction by the force of the electromagnetic coil. The drive device 22 has a configuration in which a permanent magnet magnetic path including a permanent magnet 50, a mover 51a, and a stator 52a and an electromagnet magnetic path including a mover 51b and a stator 52b are divided. The movers 51a and 51b are integrally formed. A permanent magnet 50 that generates a force repelling the spring 15 and mainly holds the mover 51a in the released state is disposed in the magnetic path for the permanent magnet, and the movers 51a and 51b are mainly provided in the magnetic path for the electromagnet. Is moved to a released state, and after the movement, an electromagnetic coil 53 is disposed to assist the holding force of the permanent magnet. In order to move the movers 51a and 51b against the spring 15, a large current is required for the electromagnetic coil 53, but the time is instantaneous and does not cause a big problem.

  The guide rail gripping mechanism in the first embodiment is for ensuring that the guide rail 2 can be gripped even if the gap between the guide rail 2 and the lining 12 is wide. During traveling, that is, when the brake is released, the force for compressing the spring 15 also increases, so that the holding power increases. By configuring the drive device 22 as described above, most of the holding force at the time of release is held by the permanent magnet 50, so that the holding power can be reduced.

Embodiment 2. FIG.
FIG. 8 is a configuration diagram showing a drive device for an elevator safety device according to Embodiment 2 of the present invention. In the first embodiment shown in FIG. 7, the magnetic path for the permanent magnet and the magnetic path for the electromagnet are arranged in series. However, in the second embodiment, as shown in FIG. 52a and 52b and movers 51a and 51b are separated by a nonmagnetic material layer 54 such as stainless steel, and arranged in parallel so as to form separate magnetic paths, and the electromagnetic coil 53 is a mover sandwiching the nonmagnetic material layer 54. You may arrange | position on the inner surface side of the stators 52a and 52b so that 51a and 51b may be enclosed. The permanent magnet 50 is disposed on the inner surface of the stator 52a on the rod 18 side and faces the mover 51a.

Embodiment 3 FIG.
FIG. 9 is a configuration diagram showing the telescopic rod of the elevator safety device according to Embodiment 3 of the present invention.
The third embodiment relates to a telescopic rod 46 in which a spring is built in the rod and the rod itself can be expanded and contracted. Specifically, as shown in FIG. 8, the link side rod 40 connected to the left and right links 17 and the shaft 20 and having a spring stopper 41 attached to the other end, and the link side rod 40 are slidable in the axial direction. , A movable shaft side rod 43 connected by the movable shaft 23 and the shaft 21, a connecting member 44 for moving the movable shaft side rod 43 and the spring seat 42 integrally, a spring It comprises a spring 45 sandwiched between a seat 42 and a spring stopper 41 in a compressed state. In the third embodiment, the connecting member 44 has a cup shape surrounding the spring 45 and the spring stopper 41, and the closed bottom portion is formed integrally with the movable shaft side rod 43, and the opening end is threaded. . The spring seat 42 is processed into a cup shape like the connecting member 44, and the opening end is threaded so as to be screwed with the screw of the connecting member 44. With this configuration, by rotating the spring seat 42, the distance between the shaft 20 and the shaft 21 can be changed, and the gap between the lining 12 and the rail 2 can be adjusted.

  In the first embodiment, the gap between the guide rail 2 and the lining 12 is not uniform on both sides of the guide rail 2 due to the unbalanced load by the passengers in the cab 6, and the connection shaft 20 and the movable shaft 23 of the left and right links 17 are not. When the operation direction is deviated, the rod 18 tilts and follows, but at that time, the gap due to the stroke of the driving device 22 becomes slightly longer than in the case where it is uniform. However, according to the third embodiment, since the entire telescopic rod 46 can expand and contract while transmitting force, the stroke of the drive device 22 does not change, and an elevator safety device with little dimensional error can be provided. .

1 is an overall configuration diagram of a car showing the arrangement of elevator safety devices according to Embodiment 1 of the present invention. It is a perspective view which shows the safety device of the elevator in Embodiment 1 of this invention. It is a top view which shows the safety device of the elevator in Embodiment 1 of this invention. It is a side view which shows the safety device of the elevator in Embodiment 1 of this invention. It is an enlarged view which shows the lining fixing | fixed part of the safety device of the elevator in Embodiment 1 of this invention. It is a mechanism figure which shows the rail holding state of the safety device of the elevator in Embodiment 1 of this invention. It is a block diagram which shows the drive device of the safety device of the elevator in Embodiment 1 of this invention. It is a block diagram which shows the drive device of the safety device of the elevator in Embodiment 2 of this invention. It is a block diagram which shows the expansion-contraction rod of the safety device of the elevator in Embodiment 3 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Brake frame, 2 Guide rail, 3 Car frame, 4 Safety device, 5 Guide, 6 Car room, 7 Anti-vibration rubber, 10 Block, 10a Spring seat, 10b Collar, 11 Arm, 12 Lining, 13 Base, 14 Fixed shaft , 15 spring, 16 spring stopper, 17 link, 18 rod, 18a link side rod, 18b movable shaft side rod, 18c connecting member, 19, 20, 21 shaft, 22 drive unit, 23 movable shaft, 30 spherical seat, 31 adjustment Screw, 32 stopper bolt, 33 spherical nut, 34 leaf spring, 40 link side rod, 41 spring stopper, 42 spring seat, 43 movable shaft side rod, 44 connecting member, 45 spring, 46 telescopic rod, 50 permanent magnet, 51a, 51b Movable element, 52a, 52b Stator, 5 3 Electromagnetic coil.

Claims (4)

A pair of arms that are rotatably held by a fixed shaft with respect to the car and that have linings attached to the ends so as to face both side surfaces of the guide rail,
A spring arranged to move the arm in a direction to narrow the gap between the opposing linings;
A set of links rotatably connected to the other end of the arm;
A rod rotatably connected to the tip of a movable shaft that reciprocates by a drive device;
A guide rail gripping mechanism, wherein the rod and the set of links are rotatably connected at one place.   The rod is composed of a link-side rod connected to a pair of links by a shaft, a movable shaft-side rod connected to the movable shaft by a shaft, and a connecting member that connects both the rods by screw connection. The guide rail gripping mechanism according to claim 1, wherein the length of the rod is adjusted by rotating the guide rail.   The guide rail gripping mechanism according to claim 1, wherein the rod itself can be extended and contracted by a spring.   The guide rail gripping mechanism according to any one of claims 1 to 3, wherein a permanent magnet that holds most of the reaction force of the spring in the released state of the safety device, and a mover facing the reaction force of the spring It has an electromagnetic coil that moves to the holding state and holds a part of the reaction force of the spring in the released state of the safety device, and has a permanent magnet and stator, a magnetic path for the permanent magnet consisting of a mover, and only the stator and the mover. An elevator safety device comprising: a drive device in which a magnetic path for an electromagnetic coil is divided.

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