EP2020397B1 - Apparatus and system for detecting elevator car overspeed - Google Patents

Apparatus and system for detecting elevator car overspeed Download PDF

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Publication number
EP2020397B1
EP2020397B1 EP20070380228 EP07380228A EP2020397B1 EP 2020397 B1 EP2020397 B1 EP 2020397B1 EP 20070380228 EP20070380228 EP 20070380228 EP 07380228 A EP07380228 A EP 07380228A EP 2020397 B1 EP2020397 B1 EP 2020397B1
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EP
European Patent Office
Prior art keywords
auxiliary wheel
rail
wheel
actuating
elevator component
Prior art date
Legal status (The legal status 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 status listed.)
Not-in-force
Application number
EP20070380228
Other languages
German (de)
French (fr)
Other versions
EP2020397A1 (en
Inventor
José Manuel c/o Thyssenkrupp Sanchez Alvarez
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ThyssenKrupp Elevator Manufacturing Spain SL
Original Assignee
ThyssenKrupp Elevator Manufacturing Spain SL
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 ThyssenKrupp Elevator Manufacturing Spain SL filed Critical ThyssenKrupp Elevator Manufacturing Spain SL
Priority to DE200760007319 priority Critical patent/DE602007007319D1/en
Priority to EP20070380228 priority patent/EP2020397B1/en
Priority to ES07380228T priority patent/ES2348101T3/en
Publication of EP2020397A1 publication Critical patent/EP2020397A1/en
Application granted granted Critical
Publication of EP2020397B1 publication Critical patent/EP2020397B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B66B5/044—Mechanical overspeed governors
    • 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
    • B66B5/044—Mechanical overspeed governors
    • B66B5/046—Mechanical overspeed governors of the pendulum or rocker arm type

Definitions

  • the invention consists of an apparatus and a system for detecting overspeed of a car, and/or a counterweight, for elevators, for actuating the emergency braking mechanism.
  • Document ES 2 184 612 describes a speed limiting system for elevators, characterized in that it consists of a safety gear fixed to the elevator car and a moving part acting with the rail of the elevator; a crown wheel rotating with the rail of the elevator associated to a centrifugal speed governor; a link quadrangle in which the two opposite sides are joined to the moving part of the safety gear and to the crown wheel respectively; means tending to keep the safety gear in stand-by and means for keeping the crown wheel in contact with the rail of the elevator.
  • Document EP 475 114 describes a safety device and a centrifugal force speed governor for preventing overspeed conditions of an elevator car in both the downward direction and the upward direction.
  • a bracket arranged in the elevator car incorporates a shaft at right angle to a guide rail arranged on the side wall.
  • a telescopic compression spring extends over the shaft between the bracket and the frame to tense the shaft with an axial movement towards the side wall.
  • the running wheel is biased against the web of the guide rails.
  • Each side of the running wheel has a pair of release levers acting on a locking wheel in the event of danger.
  • the release lever rotatably arranged on the running wheel there circulates, in normal car travel, each side of the running wheel around the stopped locking wheel, which is fixedly joined to a two-arm actuating lever.
  • the movement of the actuating lever is transmitted on one hand to the release arm and on the other to the actuating bar, which is additionally in contact with the release arm that is opposite to the safety gear.
  • the release arm circulating parallel to the guide rails is introduced in the wedge box of the safety gear.
  • the elevator car is restarted after a safety stop in the opposite direction of travel.
  • Documents DE 101 47 629 and EP 1 516 842 describe a safety system which prevents overspeed conditions of an elevator car. Both documents disclose a pendulum speed limiter having an auxiliary wheel configured to run on a guide rail of the elevator car. The speed limiter generates a synchronized alternating movement which changes when a predetermined speed of the elevator car is exceeded. The speed limiter further comprises a polygonal-shaped cam, a ratchet wheel and a rocker arranged on a side of the auxiliary wheel.
  • the rocker has a first end provided with a follower for following the cam profile, and a second end provided with a ratchet for locking the ratchet wheel when the predetermined speed of the elevator car is exceeded, thus activating an actuating means for braking the elevator car.
  • the present invention proposes an apparatus and a system that is independent of the safety gear system, that allows different types of actuations, is adaptable both to the upper part and to the lower part of the car and of the counterweight and does not necessarily have to be arranged close to the counterweight.
  • the invention describes an apparatus for detecting the overspeed of elevator components selected from a car, a counterweight and combinations thereof, having:
  • the speed detecting means comprise a ratchet mechanism comprising:
  • This pressure setting of the auxiliary wheel on the rail determines the generated friction force and the coefficient of friction between them.
  • the apparatus can also comprise slip monitoring means formed by an encoder configured to control when the auxiliary wheel slips by comparing a rotation speed of the auxiliary wheel with a travel speed of the elevator component.
  • the apparatus may further comprise at least one roller configured to roll on a second surface of the rail opposite to the first surface of the rail for:
  • This roller can also be used for the operation of the apparatus with different rail thicknesses and for the operation with a rail having a different surface condition, such as a dry rail or a greased wheel.
  • the apparatus further comprises remote actuating means to voluntarily engage the ratchet mechanism.
  • the invention describes a system for detecting overspeed of elevator components selected from a car, a counterweight and combinations thereof, characterized in that it comprises at least one apparatus such as the one described above and transmission means joined to the actuating means for transmitting an actuating movement to the braking mechanism of the elevator component.
  • the system can incorporate the apparatus in an upper or lower part of the car or counterweight, the transmission means comprising in a first case an actuating assembly and first pinion and a second pinion, and the transmission means comprising in a second case a plurality of levers.
  • the invention relates to an apparatus for detecting overspeed of elevator components selected from a car, a counterweight and combinations thereof, having:
  • the speed detecting means are configured to not generate the synchronized alternating movement when a predetermined speed of the elevator component is exceeded and to thus activate the actuating (300) means;
  • the speed detecting means comprise a ratchet mechanism comprising:
  • the apparatus further comprises:
  • the apparatus further comprises slip monitoring means formed by an encoder (500) configured to control when the auxiliary wheel (100) slips by comparing a rotation speed of the auxiliary wheel (100) with a travel speed of the elevator component.
  • slip monitoring means formed by an encoder (500) configured to control when the auxiliary wheel (100) slips by comparing a rotation speed of the auxiliary wheel (100) with a travel speed of the elevator component.
  • the apparatus further comprises at least one roller (600) configured to roll on a second surface (220) of the rail (200) opposite to the first surface (210) of the rail (200) for:
  • the apparatus further comprises a remote actuating means or coil (800) for voluntarily engaging the ratchet (150).
  • Another embodiment of the invention relates to a system for detecting overspeed of an elevator component characterized in that it comprises at least one apparatus such as the one described above and transmission means joined to the actuating means (300) for transmitting an actuating movement to the braking mechanism of the elevator component.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Maintenance And Inspection Apparatuses For Elevators (AREA)
  • Cage And Drive Apparatuses For Elevators (AREA)

Description

    Field of the Invention
  • The invention consists of an apparatus and a system for detecting overspeed of a car, and/or a counterweight, for elevators, for actuating the emergency braking mechanism.
    • Background of the Invention
  • Different implementations are known in the state of the art for detecting elevator car overspeed.
  • Document ES 2 184 612 describes a speed limiting system for elevators, characterized in that it consists of a safety gear fixed to the elevator car and a moving part acting with the rail of the elevator; a crown wheel rotating with the rail of the elevator associated to a centrifugal speed governor; a link quadrangle in which the two opposite sides are joined to the moving part of the safety gear and to the crown wheel respectively; means tending to keep the safety gear in stand-by and means for keeping the crown wheel in contact with the rail of the elevator.
  • Document EP 475 114 describes a safety device and a centrifugal force speed governor for preventing overspeed conditions of an elevator car in both the downward direction and the upward direction. A bracket arranged in the elevator car incorporates a shaft at right angle to a guide rail arranged on the side wall. There is a U-shaped frame having a running wheel at the ends of the shaft of the sides of the wall. A telescopic compression spring extends over the shaft between the bracket and the frame to tense the shaft with an axial movement towards the side wall. As a result the running wheel is biased against the web of the guide rails. Each side of the running wheel has a pair of release levers acting on a locking wheel in the event of danger. In the release lever rotatably arranged on the running wheel there circulates, in normal car travel, each side of the running wheel around the stopped locking wheel, which is fixedly joined to a two-arm actuating lever. The movement of the actuating lever is transmitted on one hand to the release arm and on the other to the actuating bar, which is additionally in contact with the release arm that is opposite to the safety gear. The release arm circulating parallel to the guide rails is introduced in the wedge box of the safety gear. For resetting the safety device, the elevator car is restarted after a safety stop in the opposite direction of travel.
  • Documents DE 101 47 629 and EP 1 516 842 describe a safety system which prevents overspeed conditions of an elevator car. Both documents disclose a pendulum speed limiter having an auxiliary wheel configured to run on a guide rail of the elevator car. The speed limiter generates a synchronized alternating movement which changes when a predetermined speed of the elevator car is exceeded. The speed limiter further comprises a polygonal-shaped cam, a ratchet wheel and a rocker arranged on a side of the auxiliary wheel. The rocker has a first end provided with a follower for following the cam profile, and a second end provided with a ratchet for locking the ratchet wheel when the predetermined speed of the elevator car is exceeded, thus activating an actuating means for braking the elevator car.
    • Description of the Invention
  • The present invention proposes an apparatus and a system that is independent of the safety gear system, that allows different types of actuations, is adaptable both to the upper part and to the lower part of the car and of the counterweight and does not necessarily have to be arranged close to the counterweight.
  • According to a first aspect, the invention describes an apparatus for detecting the overspeed of elevator components selected from a car, a counterweight and combinations thereof, having:
    • a wheel, with an auxiliary surface configured to run on a first surface of a travel rail of the elevator component;
    • actuating means for actuating a braking mechanism of the elevator component; and
    • speed detecting means for generating a synchronized alternating movement with the speed of the elevator component;
    • the speed detecting means being configured to not generate the synchronized alternating movement when a predetermined speed of the car or the counterweight is exceeded and to thus activate the actuating means.
  • The speed detecting means comprise a ratchet mechanism comprising:
    • a polygonal-shaped cam in a side of the wheel, integral with said wheel;
    • a ratchet wheel in the same side of the wheel and also integral with said wheel, said ratchet wheel comprising a plurality of projections;
    • a rocker having a first end and a second end, provided with:
      • a follower at the first end for following the cam profile;
      • a ratchet at the second end for locking the ratchet wheel, thus locking the entire wheel;
    characterised in that it comprises:
    1. 1) Positioning means formed by lock washers for pushing the auxiliary surface of the wheel against the rail and attempting to prevent the sliding of the wheel on the rail;
    2. 2) means of detecting the derailment and the variation in the pressure setting of the auxiliary surface of the wheel on the rail.
  • This pressure setting of the auxiliary wheel on the rail determines the generated friction force and the coefficient of friction between them.
  • The apparatus can also comprise slip monitoring means formed by an encoder configured to control when the auxiliary wheel slips by comparing a rotation speed of the auxiliary wheel with a travel speed of the elevator component.
  • Likewise, the apparatus may further comprise at least one roller configured to roll on a second surface of the rail opposite to the first surface of the rail for:
    • Offsetting a stress exerted by the auxiliary wheel on the rail for preventing transmission of a reaction force on the elevator component;
    • Setting a pressure between the auxiliary wheel and the rail.
  • This roller can also be used for the operation of the apparatus with different rail thicknesses and for the operation with a rail having a different surface condition, such as a dry rail or a greased wheel.
  • In addition, the apparatus further comprises remote actuating means to voluntarily engage the ratchet mechanism.
  • According to a second aspect, the invention describes a system for detecting overspeed of elevator components selected from a car, a counterweight and combinations thereof, characterized in that it comprises at least one apparatus such as the one described above and transmission means joined to the actuating means for transmitting an actuating movement to the braking mechanism of the elevator component.
  • The system can incorporate the apparatus in an upper or lower part of the car or counterweight, the transmission means comprising in a first case an actuating assembly and first pinion and a second pinion, and the transmission means comprising in a second case a plurality of levers.
    • Brief Description of the Drawings
  • A series of drawings is described below which aid in better understanding the invention and which are expressly related to an embodiment of said invention presented as a non-limiting example thereof.
    • Figure 1 is a sectional plan view showing the apparatus of the invention and its arrangement as regards a rail of an elevator. Said Figure shows the wheel or auxiliary wheel (100), the polygonal cam (110), the ratchet wheel (120), the lock washers (400), the rail (200), the roller (600) and the position of the encoder (500), which is located inside the apparatus.
    • Figure 2 shows a perspective view of the wheel, where the auxiliary surface of the wheel or auxiliary wheel (100), the polygonal cam (110) and the ratchet wheel (120) can be seen.
    • Figure 3 shows a perspective view of some components of the ratchet mechanism, such as the rocker (130), the follower (140), the ratchet (150) and the actuation of the braking system (300).
    • Figures 4A and 4B show two front and rear elevational views, respectively, where the rollers (600), the lock washers (400), the auxiliary wheel (100), the follower (140), the rocker (130), the position of the rail (200), the actuation (300), the coil (800) and the contacts (700) can be seen, said contacts being in charge of detecting the derailment and the variation in the pressure setting of the auxiliary wheel on the rail.
    • Figure 5A shows a first configuration of the apparatus of the invention where the transmission means comprise a first pinion (310) and second pinion (920) actuating assembly, intended to transmit movement to the braking system by means of a chain or the like encircling the pinion.
    • Figure 5B shows a second configuration of the invention where the transmission means comprise a levering actuation (320) and a plurality of levers (910) transmitting movement to the braking system.
  • Both figures (5A and 5B) are perspective views of the apparatus of the invention with the two mentioned configurations.
    • Description of a Preferred Embodiment of the Invention
  • A preferred embodiment of the invention is described below with the aid of the figures.
  • The invention relates to an apparatus for detecting overspeed of elevator components selected from a car, a counterweight and combinations thereof, having:
    • A wheel (100), with an auxiliary surface configured to run on a first surface (210) of a travel rail (200) of the elevator component;
    • Actuating means (300) for actuating a braking mechanism of the elevator component, characterized in that it comprises speed detecting means for generating a synchronized alternating movement with the speed of the elevator component;
  • The speed detecting means are configured to not generate the synchronized alternating movement when a predetermined speed of the elevator component is exceeded and to thus activate the actuating (300) means;
    the speed detecting means comprise a ratchet mechanism comprising:
    • A polygonal-shaped cam (110) on a side of the wheel (100), integral therewith.
    • A ratchet wheel (120) on the same side of the wheel (100) and also integral therewith, said ratchet wheel (120) comprising a plurality of projections;
    • A rocker (130) having a first end and a second end, provided with:
      • A follower (140) at the first end for following the cam profile (110);
      • A ratchet (150) at the second end for locking the ratchet wheel (120), thus locking the entire wheel (100).
  • The apparatus further comprises:
    • Positioning means, formed by lock washers (400) for pushing the auxiliary surface of the wheel (100) against the first surface (210) of the rail (200) and attempting to prevent the sliding of said auxiliary surface of the wheel on the rail;
    • Means of detecting the derailment and the variation in a pressure setting of the auxiliary surface of the wheel (100) on the rail (200).
  • According to a second preferred embodiment of the invention, the apparatus further comprises slip monitoring means formed by an encoder (500) configured to control when the auxiliary wheel (100) slips by comparing a rotation speed of the auxiliary wheel (100) with a travel speed of the elevator component.
  • According to a third preferred embodiment of the invention, the apparatus further comprises at least one roller (600) configured to roll on a second surface (220) of the rail (200) opposite to the first surface (210) of the rail (200) for:
    • Offsetting a stress exerted by the auxiliary wheel (100) on the rail (200) for preventing a transmission of a reaction force on the elevator component;
    • Setting a pressure between the auxiliary wheel (100) and the rail (200).
  • According to a fourth preferred embodiment of the invention, the apparatus further comprises a remote actuating means or coil (800) for voluntarily engaging the ratchet (150).
  • Another embodiment of the invention relates to a system for detecting overspeed of an elevator component characterized in that it comprises at least one apparatus such as the one described above and transmission means joined to the actuating means (300) for transmitting an actuating movement to the braking mechanism of the elevator component.
  • In one configuration of the invention:
    • The apparatus is arranged in an upper part of the elevator component and the transmission means comprise a plurality of levers (910).
  • In another configuration of the invention:
    • The apparatus is arranged in a lower part of the elevator component and the transmission means comprise a first pinion (310) and second pinion (920) actuating assembly, which is intended to transmit movement to the braking system by means of a chain or the like encircling it.

Claims (7)

  1. An apparatus for detecting overspeed of elevator components selected from a car, a counterweight and combinations thereof, having:
    an auxiliary wheel (100) configured to run on a first surface (210) of a travel rail (200) of the elevator component;
    actuating means (300) for actuating a braking mechanism of the elevator component; and
    speed detecting means for generating a synchronized alternating movement with the speed of the elevator component;
    the speed detecting means are configured to not generate the synchronized alternating movement when a predetermined speed of the elevator component is exceeded and to thus activate the actuating (300) means;
    the speed detecting means comprise a ratchet mechanism comprising:
    a polygonal-shaped cam (110) on a first side of the auxiliary wheel (100) integral with said auxiliary wheel (100);
    a ratchet wheel (120) on the first side of the auxiliary wheel (100) integral with said auxiliary wheel (100), said ratchet wheel (120) comprising a plurality of projections;
    a rocker (130) having a first end and a second end, provided with:
    a follower (140) at the first end for following the cam profile (110);
    a ratchet (150) at the second end for locking the ratchet wheel (120) and thus locking the auxiliary wheel (100);
    characterized in that:
    it comprises:
    positioning means, comprising a plurality of lock washers (400) for pushing the auxiliary wheel (100) against the first surface (210) of the rail (200) and preventing sliding of the auxiliary wheel (100) on the rail (200); and
    means for detecting derailment and variation in a pressure setting of the auxiliary wheel (100) on the rail (200).
  2. The apparatus of claim 1 characterized in that it further comprises slip monitoring means formed by an encoder (500) configured to control when the auxiliary wheel (100) slips by comparing a rotation speed of the auxiliary wheel (100) with a travel speed of the elevator component.
  3. The apparatus of any of claims 1-2 characterized in that it further comprises at least one roller (600) configured to roll on a second surface (220) of the rail (200) opposite to the first surface (210) of the rail (200) for:
    offsetting a stress exerted by the auxiliary wheel (100) on the rail (200) for preventing transmission of a reaction force on the elevator component;
    setting a pressure between the auxiliary wheel (100) and the rail (200).
  4. The apparatus of any of claims 1-3 characterized in that it further comprises remote actuating means or coil (800) for engaging the ratchet (150) voluntarily.
  5. A system for detecting overspeed of elevator components selected from a car, a counterweight and combinations thereof, characterized in that it comprises at least one apparatus according to any of claims 1-4 and transmission means joined to the actuating means (300) for transmitting an actuating movement to the braking mechanism of the elevator component.
  6. The system of claim 5, arranged in an upper part of the elevator component, characterized in that the transmission means for transmitting the actuating movement to the braking mechanism comprise a plurality of levers (910).
  7. The system of claim 5, arranged in a lower part of the elevator component, characterized in that the transmission means for transmitting the actuating movement to the braking mechanism comprise a first pinion (310) and second pinion (920) actuating assembly, where second pinion (920) is configured to transmit movement to the braking system by means of a chain meshing in said second pinion (920).
EP20070380228 2007-08-03 2007-08-03 Apparatus and system for detecting elevator car overspeed Not-in-force EP2020397B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE200760007319 DE602007007319D1 (en) 2007-08-03 2007-08-03 Device and system for detecting increased speed of an elevator car
EP20070380228 EP2020397B1 (en) 2007-08-03 2007-08-03 Apparatus and system for detecting elevator car overspeed
ES07380228T ES2348101T3 (en) 2007-08-03 2007-08-03 APPARATUS AND SYSTEM TO DETECT AN EXCESS OF SPEED OF A BOX FOR ELEVATORS.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20070380228 EP2020397B1 (en) 2007-08-03 2007-08-03 Apparatus and system for detecting elevator car overspeed

Publications (2)

Publication Number Publication Date
EP2020397A1 EP2020397A1 (en) 2009-02-04
EP2020397B1 true EP2020397B1 (en) 2010-06-23

Family

ID=38776201

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20070380228 Not-in-force EP2020397B1 (en) 2007-08-03 2007-08-03 Apparatus and system for detecting elevator car overspeed

Country Status (3)

Country Link
EP (1) EP2020397B1 (en)
DE (1) DE602007007319D1 (en)
ES (1) ES2348101T3 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009055768A1 (en) * 2009-11-25 2011-05-26 Lödige Fördertechnik GmbH Device and method for securing, in particular the crash, of elevators and lifting devices
EP3553011A1 (en) * 2018-04-13 2019-10-16 Otis Elevator Company Overspeed detection and guiding devices for elevator systems

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2857376C2 (en) * 1978-01-21 1981-10-01 Thyssen Aufzüge GmbH, 7303 Neuhausen Speed limiter
ATE33484T1 (en) * 1983-03-09 1988-04-15 Bongers & Deimann DEVICE FOR LIMITING THE DESCENT OF AN ELEVATOR.
US5065845A (en) * 1990-09-13 1991-11-19 Pearson David B Speed governor safety device for stopping an elevator car
ES2184612B1 (en) 2001-05-25 2004-10-01 S.A. De Vera (Savera) SPEED LIMITER SYSTEM FOR ELEVATORS.
DE10147629B4 (en) 2001-09-27 2004-12-02 Gerhard Schlosser elevator
DE10343193B4 (en) 2003-09-18 2005-12-29 Aufzugevolution Schlosser & Schneider Gmbh Control and regulating device for an elevator

Also Published As

Publication number Publication date
EP2020397A1 (en) 2009-02-04
DE602007007319D1 (en) 2010-08-05
ES2348101T3 (en) 2010-11-30

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