WO2003072479A1 - Elevator governor rope tensioning - Google Patents

Elevator governor rope tensioning Download PDF

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Publication number
WO2003072479A1
WO2003072479A1 PCT/US2002/005055 US0205055W WO03072479A1 WO 2003072479 A1 WO2003072479 A1 WO 2003072479A1 US 0205055 W US0205055 W US 0205055W WO 03072479 A1 WO03072479 A1 WO 03072479A1
Authority
WO
WIPO (PCT)
Prior art keywords
spring
safety
loop
operating lever
rope
Prior art date
Application number
PCT/US2002/005055
Other languages
French (fr)
Inventor
Andres Monzon
Luis Marti
Emilio Fernandez Salinero
Original Assignee
Otis Elevator Company
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Otis Elevator Company filed Critical Otis Elevator Company
Priority to PCT/US2002/005055 priority Critical patent/WO2003072479A1/en
Priority to AU2002244093A priority patent/AU2002244093A1/en
Publication of WO2003072479A1 publication Critical patent/WO2003072479A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
    • B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
    • B66B5/04—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions for detecting excessive speed

Definitions

  • This invention relates to an elevator safety-actuating governor rope loop which has a tensioning spring within the rope loop, obviating the need for governor rope tensioning weights or pit springs.
  • a typical elevator safety system (Fig. 1) comprises a speed responsive device known as a governor 11, which includes a steel rope 12 forming a complete loop between sheaves 13, 14 at the top and bottom of the elevator hoistway.
  • the rope 12 is fixed, such as by flanges 18, 19 (or in any suitable way), to a safety operating lever 21 mounted on the crosshead 22 of the elevator car 23, that works mechanical linkages and pull rods (not shown). If the car goes too fast, the governor senses the overspeed condition and releases a clutching device that grips the governor rope, arresting its motion.
  • the tension sheave 14 at the bottom of the hoistway typically includes a tension weight 29, which applies an essentially constant amount of force to the sheave at the bottom of the hoistway to keep the governor rope tight.
  • the tension weight may be mounted on a rocking arm 30 as in Fig. 1, or it may be mounted directly to the sheave 14 between sliding guides 31. Other configurations are known.
  • the tension device Since the governor rope 12 will stretch after installation, the tension device must be able to accommodate the resultant elongation. Some devices can only accommodate an inadequate amount of elongation, requiring service calls within months after installation. In addition, tensioning devices require a certain free height in the pit to allow rocking or sliding action as a result of rope elongation. The checking and repair of the tensioning devices must be done in the pit, which adds time, danger and complexity to the service call. In the case of bidirectional safeties (which can operate in response to overspeed in the upward direction as well as in the downward direction) increased tension is required to ensure traction for the upward acting safeties. This results in an undesired increase of force required for tripping the safeties in the downward direction. Alternatively, springs may be added between the lower sheave and the tensioning device, but this increases the cost and require more free space in the pit.
  • Objects of the invention include an elevator governor: which takes up minimum space in the hoistway pit; which does not utilize tensioning weights; which is relatively low in cost; which is easily inspected and maintained, without having personnel enter the hoistway pit; which is readily adapted for either single direction or bidirectional safeties; and which can accommodate a large elongation of the rope due to stretching.
  • an elevator governor rope loop includes a spring that provides the required tension in the loop.
  • the spring has a low stiffness constant in order to accommodate rope elongation while maintaining adequate rope loop tension.
  • the spring is mounted alongside the elevator car, rendering it easy to inspect and repair.
  • the spring may be bifurcated, one spring mounted within the governor rope loop above the safety operating lever, the other spring being mounted below the safety operating lever, thereby serving bidirectional safeties without excessive delay in actuating.
  • the invention may employ a single spring and two governors to provide bidirectional safety operation without any delay due to the spring.
  • the invention may be practiced with tension springs or compression springs.
  • the invention can be utilized with safeties which arrest motion of the car only in the downward direction, or with safeties which also arrest the motion of the car in the upward direction.
  • the governor may be located either at the top of the hoistway or in the pit.
  • the tensioning device of the invention does not require any space in the pit, and can be serviced without entering the pit.
  • FIG. 1 is a simplified, stylized perspective view of an elevator car with a governor-actuated safety, employing a rotating governor rope tensioning device, known to the art.
  • Fig. 2 is a partial, side elevation view of a sliding governor rope tensioning device, known to the art.
  • FIG. 3 is a simplified, stylized side elevation schematic of an elevator governor- actuated safety system employing the present invention.
  • Fig. 4 is a simplified, stylized side elevation schematic of an elevator governor- actuated safety system employing an alternative form of the present invention.
  • Fig. 5 is a simplified, stylized side elevation schematic of an elevator governor- actuated safety system employing a modification of the invention that permits bidirectional safety actuation.
  • Fig. 6 is a simplified, stylized side elevation schematic of an elevator governor- actuated safety system employing two governors that permit bidirectional safety actuation.
  • Fig. 7 is a simplified, stylized side elevation schematic of an elevator governor- actuated safety system employing a compression spring.
  • Fig. 8 is a simplified, stylized side elevation schematic of an assembly employing a compression spring as an alternative to tension springs.
  • a spring 35 is disposed within the governor rope loop 12, to provide the necessary tension.
  • a spring has a stiffness constant of about 0.37 Newtons per millimeter with a relaxed length of 440 millimeters, and has a length of about 1.1 meters when extended by a force of about 226 Newtons. This is more than adequate force to operate the safety operating lever 21 in the case of an overspeed.
  • Fig. 4 illustrates that the spring 35 may be disposed on the opposite side of the loop from the flanges 18, 19 with no change in operation.
  • Figs. 3 and 4 will actuate the safety operating lever 21 substantially instantaneously in the event of a downward overspeed condition since there is no spring between the flange 18 and the arrested sheave 13. In the case of overspeed in the upward direction, the engagement of the flange 19 by the safety operating lever 21 will stretch the spring 35 until it reaches a sufficient force to rotate the safety operating lever 21.
  • FIG. 5 An improved embodiment for bidirectional safeties is illustrated in Fig. 5.
  • two springs 37, 38 are provided.
  • each spring will have to elongate by about 203 millimeters (around 8 inches) to reach a required actuation force of on the order of 150 Newtons.
  • Fig. 5 also illustrates that the governor 11 and sheave 13 be located in the pit and the sheave 14 may be located at the top of the hoistway.
  • a compression spring 42 extends between a hollow support 44 mounted to the elevator car 23 and a flange 46 fastened to one end of the rope 12.
  • Some form of support or guide can be provided to keep the spring 42 and the rope therein vertically aligned, if desired, utilizing any simple technique known to the art.
  • a compression spring assembly 50 may be substituted for any tension springs hereinbefore as the spring portion of the loop.
  • a frame 52 has a first member 53 which is connected to a first end of the rope, as by means of a flange 55 attached to the rope.
  • a second member 56 allows a second end of the rope to pass therethrough toward the first member.
  • the flange 46 compresses the compression spring 42 against the second member.
  • the frame may be a cylinder, to guide the spring.

Abstract

One or two springs (35, 37, 38) are inserted into the closed loop rope (12) of an elevator safety-actuating governor (11), in order to provide all of the tension in the loop and eliminate the need for a tensioning weight (29). An embodiment utilizing a single spring (35) and two governors (11, 40) provide bidirectional actuation of the safety operating lever (21). A compression spring (42) may push a flange at one of the ropes (46) against a hollow support (44) mounted to the car (23) in an another embodiment.

Description

Elevator Governor Rope Tensioning
Technical Field
[0001] This invention relates to an elevator safety-actuating governor rope loop which has a tensioning spring within the rope loop, obviating the need for governor rope tensioning weights or pit springs.
Background Art
[0002] A typical elevator safety system (Fig. 1) comprises a speed responsive device known as a governor 11, which includes a steel rope 12 forming a complete loop between sheaves 13, 14 at the top and bottom of the elevator hoistway. The rope 12 is fixed, such as by flanges 18, 19 (or in any suitable way), to a safety operating lever 21 mounted on the crosshead 22 of the elevator car 23, that works mechanical linkages and pull rods (not shown). If the car goes too fast, the governor senses the overspeed condition and releases a clutching device that grips the governor rope, arresting its motion. When the governor rope is static, as the car continues to move, the governor rope operates the safety operating lever, so the linkages and pull rods pull safety wedges between the guide rail and safety shoes 26 mounted on the car 23, thereby bringing the elevator to a quick, but safe, stop. To keep the governor rope 12 tight, so that it can operate quickly, the tension sheave 14 at the bottom of the hoistway typically includes a tension weight 29, which applies an essentially constant amount of force to the sheave at the bottom of the hoistway to keep the governor rope tight. The tension weight may be mounted on a rocking arm 30 as in Fig. 1, or it may be mounted directly to the sheave 14 between sliding guides 31. Other configurations are known. Since the governor rope 12 will stretch after installation, the tension device must be able to accommodate the resultant elongation. Some devices can only accommodate an inadequate amount of elongation, requiring service calls within months after installation. In addition, tensioning devices require a certain free height in the pit to allow rocking or sliding action as a result of rope elongation. The checking and repair of the tensioning devices must be done in the pit, which adds time, danger and complexity to the service call. In the case of bidirectional safeties (which can operate in response to overspeed in the upward direction as well as in the downward direction) increased tension is required to ensure traction for the upward acting safeties. This results in an undesired increase of force required for tripping the safeties in the downward direction. Alternatively, springs may be added between the lower sheave and the tensioning device, but this increases the cost and require more free space in the pit.
Disclosure of Invention
[0003] Objects of the invention include an elevator governor: which takes up minimum space in the hoistway pit; which does not utilize tensioning weights; which is relatively low in cost; which is easily inspected and maintained, without having personnel enter the hoistway pit; which is readily adapted for either single direction or bidirectional safeties; and which can accommodate a large elongation of the rope due to stretching. [0004] According to the present invention, an elevator governor rope loop includes a spring that provides the required tension in the loop. According further to the invention, the spring has a low stiffness constant in order to accommodate rope elongation while maintaining adequate rope loop tension. In accordance with the invention, the spring is mounted alongside the elevator car, rendering it easy to inspect and repair. According to the invention, the spring may be bifurcated, one spring mounted within the governor rope loop above the safety operating lever, the other spring being mounted below the safety operating lever, thereby serving bidirectional safeties without excessive delay in actuating. The invention may employ a single spring and two governors to provide bidirectional safety operation without any delay due to the spring. The invention may be practiced with tension springs or compression springs.
[0005] The invention can be utilized with safeties which arrest motion of the car only in the downward direction, or with safeties which also arrest the motion of the car in the upward direction. When using a bifurcated spring, the governor may be located either at the top of the hoistway or in the pit. The tensioning device of the invention does not require any space in the pit, and can be serviced without entering the pit. [0006] Other objects, features and advantages of the present invention will become more apparent in the light of the following detailed description of exemplary embodiments thereof, as illustrated in the accompanying drawing. Brief Description of the Drawings
[0007] Fig. 1 is a simplified, stylized perspective view of an elevator car with a governor-actuated safety, employing a rotating governor rope tensioning device, known to the art.
[0008] Fig. 2 is a partial, side elevation view of a sliding governor rope tensioning device, known to the art.
[0009] Fig. 3 is a simplified, stylized side elevation schematic of an elevator governor- actuated safety system employing the present invention.
[0010] Fig. 4 is a simplified, stylized side elevation schematic of an elevator governor- actuated safety system employing an alternative form of the present invention. [0011] Fig. 5 is a simplified, stylized side elevation schematic of an elevator governor- actuated safety system employing a modification of the invention that permits bidirectional safety actuation.
[0012] Fig. 6 is a simplified, stylized side elevation schematic of an elevator governor- actuated safety system employing two governors that permit bidirectional safety actuation.
[0013] Fig. 7 is a simplified, stylized side elevation schematic of an elevator governor- actuated safety system employing a compression spring. [0014] Fig. 8 is a simplified, stylized side elevation schematic of an assembly employing a compression spring as an alternative to tension springs.
Mode(s) for Carrying Out the Invention
[0015] Referring to Fig. 3, in accordance with the invention, a spring 35 is disposed within the governor rope loop 12, to provide the necessary tension. In one exemplary embodiment, a spring has a stiffness constant of about 0.37 Newtons per millimeter with a relaxed length of 440 millimeters, and has a length of about 1.1 meters when extended by a force of about 226 Newtons. This is more than adequate force to operate the safety operating lever 21 in the case of an overspeed.
[0016] Fig. 4 illustrates that the spring 35 may be disposed on the opposite side of the loop from the flanges 18, 19 with no change in operation.
[0017] The embodiments of Figs. 3 and 4 will actuate the safety operating lever 21 substantially instantaneously in the event of a downward overspeed condition since there is no spring between the flange 18 and the arrested sheave 13. In the case of overspeed in the upward direction, the engagement of the flange 19 by the safety operating lever 21 will stretch the spring 35 until it reaches a sufficient force to rotate the safety operating lever 21.
[0018] An improved embodiment for bidirectional safeties is illustrated in Fig. 5. Therein, instead of one spring 35, two springs 37, 38 are provided. Typically, each spring will have to elongate by about 203 millimeters (around 8 inches) to reach a required actuation force of on the order of 150 Newtons. However, this is less retardation than is required in some existing, certified governors, which require about 240 millimeters of governor rope travel in order to actuate the safeties. Fig. 5 also illustrates that the governor 11 and sheave 13 be located in the pit and the sheave 14 may be located at the top of the hoistway.
[0019] In Fig. 6, an embodiment using a single spring 35 and an additional governor 40 will provide bidirectional safety-actuation without any delay. In Fig. 7, a compression spring 42 extends between a hollow support 44 mounted to the elevator car 23 and a flange 46 fastened to one end of the rope 12. Some form of support or guide can be provided to keep the spring 42 and the rope therein vertically aligned, if desired, utilizing any simple technique known to the art.
[0020] In Fig. 8, a compression spring assembly 50 may be substituted for any tension springs hereinbefore as the spring portion of the loop. A frame 52 has a first member 53 which is connected to a first end of the rope, as by means of a flange 55 attached to the rope. A second member 56 allows a second end of the rope to pass therethrough toward the first member. The flange 46 compresses the compression spring 42 against the second member. The frame may be a cylinder, to guide the spring.

Claims

Claims
1. A safety system for an elevator car (23) moveable within a hoistway comprising: a safety operating lever (21) disposed on said elevator car; a governor (11) including a pair of sheaves (13, 14) disposed at opposite ends of the hoistway; a loop (12) extending around said sheaves and attached to said safety operating lever; characterized by the improvement comprising: said loop including a spring portion (35; 37, 38; 42) which travels between said sheaves to provide all of the tension in said loop; and the remainder of said loop comprising steel rope.
2. A safety system according to claim 1 wherein: said spring is a tension spring (Figs. 3-6).
3. A safety system according to claim 1 wherein: said spring portion is disposed on the side of the loop which is fastened to said safety operating lever (Figs. 3, 5, 7 and 8).
4. A safety system according to claim 1 wherein: said spring portion is disposed on the side of the loop which is not fastened to said safety operating lever (Figs. 4 and 6).
5. A safety system according to claim 4 further comprising: a second governor (40), each of said governors attached to one of said sheaves, whereby to provide bidirectional operation of said safety operating lever without any delay caused by said spring.
6. A safety system according to claim 1 wherein: said spring portion comprises a spring (37) mounted above said safety operating lever and a spring (38) mounted below said safety operating lever.
7. A safety system according to claim 1 wherein: said spring portion is a compression spring (42) (Fig. 7) extending between a fixed support (44) on said elevator car and a flange (46) fastened to one end of said loop, the other end of said loop being attached to said safety operating lever.
8. A safety system according to claim 1 wherein: said spring portion comprises a frame (52) having two separated, interconnected members (53, 56), a first end of said rope connected to a first one of said members, a second end of said rope extending through a second one of said members toward said first member, said second end attached to a spring-engaging flange; and a compression spring (42) surrounding said rope between said second member and said flange.
PCT/US2002/005055 2002-02-07 2002-02-07 Elevator governor rope tensioning WO2003072479A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/US2002/005055 WO2003072479A1 (en) 2002-02-07 2002-02-07 Elevator governor rope tensioning
AU2002244093A AU2002244093A1 (en) 2002-02-07 2002-02-07 Elevator governor rope tensioning

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2002/005055 WO2003072479A1 (en) 2002-02-07 2002-02-07 Elevator governor rope tensioning

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005021413A1 (en) * 2003-09-02 2005-03-10 Kone Corporation Elevator safety gear arrangement
WO2008056026A1 (en) * 2006-11-10 2008-05-15 Kone Corporation Traction sheave elevator without counterweight
WO2008056020A3 (en) * 2006-11-10 2008-10-02 Kone Corp Arrangement in an elevator speed limiter
FR2965558A1 (en) * 2010-10-05 2012-04-06 Arnoult Patrice TENSIONER DEVICE FOR PARACHUTE CONTROL SPEED LIMITER FOR ELEVATOR
CN105621190A (en) * 2014-11-25 2016-06-01 三菱电机株式会社 Elevator safety device
CN107187988A (en) * 2017-06-30 2017-09-22 快意电梯股份有限公司 Brake device for elevator and its shift mechanism

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US2266915A (en) * 1940-12-14 1941-12-23 Curtis Mfg Co Lift for raising motor vehicles
US2274000A (en) * 1941-10-16 1942-02-24 Otis Elevator Co Elevator safety apparatus
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US2581297A (en) * 1949-07-20 1952-01-01 Westinghouse Electric Corp Elevator safety device
US4083432A (en) * 1976-12-01 1978-04-11 Otis Elevator Company Safety arrangement
US4565264A (en) * 1982-01-07 1986-01-21 Mitsubishi Denki Kabushiki Kaisha Elevator system
US5299661A (en) * 1992-11-03 1994-04-05 Otis Elevator Company Mechanical overspeed safety device
US5307904A (en) * 1992-09-08 1994-05-03 Yoo Young S Stopping of elevators in the up direction
US5495919A (en) * 1994-04-25 1996-03-05 Otis Elevator Company Safety brake apparatus for an elevator car or counterweight
US5513723A (en) * 1994-07-01 1996-05-07 Harnischfeger Corporation Double-masted crane with improved brake arrangement
US6318506B1 (en) * 2000-05-22 2001-11-20 Otis Elevator Company Single rope elevator governor

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US601535A (en) * 1898-03-29 taylor
US601536A (en) * 1898-03-29 John t
US716950A (en) * 1902-07-26 1902-12-30 James J Slevin Elevator.
US2266915A (en) * 1940-12-14 1941-12-23 Curtis Mfg Co Lift for raising motor vehicles
US2274000A (en) * 1941-10-16 1942-02-24 Otis Elevator Co Elevator safety apparatus
US2298167A (en) * 1942-03-07 1942-10-06 Westinghouse Elec Elevator Co Elevator safety device
US2581297A (en) * 1949-07-20 1952-01-01 Westinghouse Electric Corp Elevator safety device
US4083432A (en) * 1976-12-01 1978-04-11 Otis Elevator Company Safety arrangement
US4565264A (en) * 1982-01-07 1986-01-21 Mitsubishi Denki Kabushiki Kaisha Elevator system
US5307904A (en) * 1992-09-08 1994-05-03 Yoo Young S Stopping of elevators in the up direction
US5299661A (en) * 1992-11-03 1994-04-05 Otis Elevator Company Mechanical overspeed safety device
US5495919A (en) * 1994-04-25 1996-03-05 Otis Elevator Company Safety brake apparatus for an elevator car or counterweight
US5513723A (en) * 1994-07-01 1996-05-07 Harnischfeger Corporation Double-masted crane with improved brake arrangement
US6318506B1 (en) * 2000-05-22 2001-11-20 Otis Elevator Company Single rope elevator governor

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005021413A1 (en) * 2003-09-02 2005-03-10 Kone Corporation Elevator safety gear arrangement
WO2008056026A1 (en) * 2006-11-10 2008-05-15 Kone Corporation Traction sheave elevator without counterweight
WO2008056020A3 (en) * 2006-11-10 2008-10-02 Kone Corp Arrangement in an elevator speed limiter
EA014743B1 (en) * 2006-11-10 2011-02-28 Коне Корпорейшн Traction sheave elevator without counterweight
FR2965558A1 (en) * 2010-10-05 2012-04-06 Arnoult Patrice TENSIONER DEVICE FOR PARACHUTE CONTROL SPEED LIMITER FOR ELEVATOR
EP2439163A1 (en) * 2010-10-05 2012-04-11 Arnoult, M. Patrice Tensioning device for a speed limiter for controlling an elevator safety gear
CN105621190A (en) * 2014-11-25 2016-06-01 三菱电机株式会社 Elevator safety device
CN107187988A (en) * 2017-06-30 2017-09-22 快意电梯股份有限公司 Brake device for elevator and its shift mechanism
CN107187988B (en) * 2017-06-30 2023-03-14 快意电梯股份有限公司 Elevator brake device and lifting mechanism thereof

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