WO2002014201A1 - Procede et appareil permettant de surveiller et de detecter les dents abimees ou manquantes d'un peigne de bande transporteuse de personnes - Google Patents

Procede et appareil permettant de surveiller et de detecter les dents abimees ou manquantes d'un peigne de bande transporteuse de personnes Download PDF

Info

Publication number
WO2002014201A1
WO2002014201A1 PCT/CH2001/000497 CH0100497W WO0214201A1 WO 2002014201 A1 WO2002014201 A1 WO 2002014201A1 CH 0100497 W CH0100497 W CH 0100497W WO 0214201 A1 WO0214201 A1 WO 0214201A1
Authority
WO
WIPO (PCT)
Prior art keywords
die
comb plate
signal
fluid
damaged
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.)
Ceased
Application number
PCT/CH2001/000497
Other languages
English (en)
Inventor
Vincent P. Robibero
Michael W. Thomas
Geeming Chin
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.)
Inventio AG
Original Assignee
Inventio AG
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 Inventio AG filed Critical Inventio AG
Priority to AU2001279538A priority Critical patent/AU2001279538A1/en
Priority to BRPI0107124-6A priority patent/BR0107124B1/pt
Priority to CA002385272A priority patent/CA2385272A1/fr
Priority to DE60140258T priority patent/DE60140258D1/de
Priority to EP01957674A priority patent/EP1309510B1/fr
Priority to AT01957674T priority patent/ATE446274T1/de
Publication of WO2002014201A1 publication Critical patent/WO2002014201A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B29/00—Safety devices of escalators or moving walkways
    • B66B29/02—Safety devices of escalators or moving walkways responsive to, or preventing, jamming by foreign objects
    • B66B29/06—Combplates

Definitions

  • the present invention relates to passenger conveyors and, more particularly, to a safety device for passenger conveyors.
  • a passenger conveyor such as an escalator or a moving walk, is typically formed of a plurality of tread plates propelled between stationary pieces, i.e., landings, where passengers get on and off the conveyor.
  • a comb plate is attached to each landing for deflecting or pushing foreign objects away from that interface.
  • the comb plate has a plurality of teeth shaped to mesh with longitudinal grooves in the tread plates.
  • the teeth of the comb plate may break off or otherwise become damaged so that objects such as d e pointed heel of a shoe, miscellaneous refuse, or, more dangerously, a body .part of a passenger, may become lodged or entrapped between a tread plate and the comb plate.
  • the comb plate teeth may be damaged due to cyclic stresses during use or impact loads by, for example, pebbles or screws wedged in the grooves of moving tread plates.
  • a typical mode of failure is that one or more comb plate teeth break off thereby exposing tlie gap between the landing and a tread plate. Consequently, tlie comb plate becomes less effective in deflecting objects from the gap. If the drive mechanism is not immediately stopped, the passenger may suffer substantial injury or the conveyor drive mechanism may sustain substantial damage.
  • comb plate teeth are visually inspected by building or service personnel. This dependency on human observation and intervention has sometimes led to damaged comb teeth remaining in service for extended periods of time, and thus exposed passengers to unnecessary risks.
  • U.S. Patent No. 5,718,319 discloses a safety device for detecting objects stuck in an escalator or a moving walk.
  • the device includes a high-strength flexible wire extending transversely through a series of holes formed in the teeth of a comb plate.
  • the wire is connected to an actuator, which shuts off tlie motor operating the escalator when the wire is stretched or elongated.
  • This device cannot detect cracked or missing teeth as it is possible that a tooth can be broken off without causing the wire to stretch.
  • this device requires increased maintenance as tlie wire traps and accumulates small foreign objects, which would have been deflected by tlie comb plate teeth.
  • German reference DE 2 135 864 discloses a further safety device for escalators including an electrical conductor arranged in tl e comb teeth for establishing an electronic signal path through the comb tooth assembly.
  • International Publication No. WO 91/06501 discloses an escalator safety device in which tl e teeth comprise an electric conductor molded therein which is part of an electrical circuit. These safety devices are difficult to manufacture and therefore are expensive to manufacture.
  • Yet another safety device is disclosed in Japanese Abstract No. JP 4-153195 in which optical means 24, 25, 26 are used to detect deformation or breaks in tl e comb teeth.
  • German reference DE 680 847 discloses a safety device for an escalator in which a light beam is projected through holes in the comb teeth and detected by a photoelectric device positioned on the side of the escalator.
  • the manufacture of the optical means is also complex. Furthermore, dirt or other foreign objects may occlude the light path and produce a false signal.
  • An object of the present invention is to provide a method and an apparatus for detecting damage to comb plate teeth of a passenger conveyor.
  • a missing or broken comb tooth can be detected by monitoring tlie continuity of an electrical or fluid circuit passing through or along each of the comb plate teeth, the circuit comprising part of a mechanism embedded in the comb plate.
  • tlie continuity of tlie circuit indicates a comb tooth has been damaged.
  • a signal line is arranged on a circuit board to extend along or through each of tlie comb plate teeti to form a series circuit so that when a comb tooth is damaged, the flow of electrical current through tlie series circuit is interrupted. If the conductor supplies power to a relay of a safety circuit of the passenger conveyor, a damaged comb tooth will result in a loss of power to the relay, causing tl e passenger conveyor to immediately stop so as to prevent further injury to the passenger or damage to tlie conveyor drive mechanism.
  • tlie signal line forms a parallel circuit such that damage to a comb tooth results in a change or stoppage of electrical current through tlie circuit.
  • a monitoring device detects the change in the electrical current and actuates a warning device and/or shuts off die conveyor's drive mechanism.
  • tlie number of broken comb teetii can be determined by measuring or monitoring changes in the equivalent resistance of tl e parallel circuit or the signal strengtli of tl e entire parallel circuit.
  • tlie monitoring device may shut down the passenger conveyor or issue a warning signal indicating the comb plate has sustained damage.
  • the comb plate includes a continuous fluid channel formed in each of the comb plate teeth.
  • the fluid chamber may be filled with an electrically conductive fluid such as, for example, a conductive gas or antifreeze liquid connected to a voltage source to form a circuit so that when a comb tooth breaks, the fluid leaks out thereby opening the circuit.
  • an electrically conductive fluid such as, for example, a conductive gas or antifreeze liquid connected to a voltage source to form a circuit so that when a comb tooth breaks, the fluid leaks out thereby opening the circuit.
  • a detector Upon sensing an open circuit a detector informs a controller then actuates a warning device to indicate that a comb plate tooth has been damaged.
  • Fig. 1 depicts a prior art passenger escalator having a comb plate
  • Fig. 2 is a cross-sectional view of a comb plate and a tread plate
  • Fig. 3 is a plan view of two sections of a comb plate according to an embodiment of tlie present invention.
  • Fig. 4 is a cross sectional view of a comb plate according to an embodiment of the present invention
  • Fig. 5 is a plan view as in Fig. 3 showing anodier embodiment of die present invention
  • Fig. 6 is a schematic view of yet another embodiment of the present invention.
  • Fig. 7 is a schematic view of another embodiment of die invention incorporating a fluid chamber; and ' Fig. 8 schematically illustrates anodier embodiment of the invention having a pressure sensor disposed inside a fluid chamber.
  • Fig. 1 illustrates a prior art escalator 10 including a treadway 12 formed by a plurality of tread plates 14 and risers 16.
  • the tread plates 14 have longitudinally spaced tread grooves 18 formed on their top surfaces and are guided to slide beneath a comb plate 20 attached to a landing 22.
  • the comb plate 20 is constructed of a plurality of sections arranged side by side and has teeth 24 shaped to project into die tread grooves 18. So arranged, the comb plate teeth 24 prevent debris deposited in the tread grooves 18 or a passenger's shoe or garment from becoming lodged at d e gap between the landing 22 and a tread plate 14 by deflecting it away from the gap.
  • Fig. 1 illustrates a prior art escalator 10 including a treadway 12 formed by a plurality of tread plates 14 and risers 16.
  • the tread plates 14 have longitudinally spaced tread grooves 18 formed on their top surfaces and are guided to slide beneath a comb plate 20 attached to a landing 22.
  • the comb plate 20 is
  • die comb plate toodi 24 extends into a groove 18 of the tread plate 14 and is dimensioned to maintain a minimum clearance between the bottom surface 26 of the tooth 24 and die bottom wall 28 of die groove 18.
  • d e comb plate tooth 24 has a sloping top surface extending from near die bottom wall 28 of die groove 18 to a distance above die tread plate 14 and shaped to deflect objects away from the interface 30 between die landing 22 and the tread plate 14.
  • a comb plate tooth 24 can become damaged or broken due to fatigue or from collision with debris entrenched in the groove 18 of a tread plate 14.
  • each of the comb plate teedi 24 can be monitored using an electrical and/or fluid mechanism embedded in die comb plate.
  • the mechanism establishes a detectable physical variable such as, for example, the strength of an electrical signal or a level of fluid pressure for each of the comb plate teeth 24 so that when a tooth of die comb plate 20 becomes damaged, the value of the detectable physical variable changes.
  • a detector senses the changed value of the detectable physical variable and generates a signal, preferably when the changed value varies from a predetermined direshold.
  • a controller receives die signal from die detector and causes d e passenger conveyor 10 to shut down and/or issues a warning to d e passengcr(s) or operator(s) of the conveyor 10.
  • Figs. 3 and 4 schematically illustrate an embodiment of an apparatus for detecting a damaged toodi of a comb plate 20 comprising two comb plate sections 44, 46 using a serial continuity check.
  • Each comb plate section 44, 46 comprises a circuit board 31 comprising teeth 33 corresponding to the teeth 24 of the comb plate 20.
  • a signal line 32 is arranged on die circuit board 31 using known circuit board printing technology and extends along and/or dirough each of the teedi 33 of die circuit board 31.
  • the comb plate 20 is overmolded around die circuit board 31.
  • die signal line 32 may be connected to a signal generator 34 for generating a signal through the signal line 32 such that a damaged tooth 24 will disrupt or otherwise vary the signal transmitted through die signal line 32.
  • the signal line 32 may, for example, be a conductive signal pad formed on the one-sided circuit board injection overmolded with an engineering plastic to form the comb plate 20 and comb plate teeth 24.
  • the circuit board 31 may be formed of high temperature composite material such as, for example, polyimide, which has a higher processing temperature than the overmold material; in which case, the circuit board 31 and d e overmold material form separate layers. Alternatively, the circuit board 31 and the overmold material are the same; in which case, the circuit board 31 fuses with the overmold material. In any event, the conductive signal lines 32 are embedded in each of the comb plate teeth 24.
  • a detector 36 connected to d e signal line senses d e signal disruption or variation and sends a warning message indicating die presence of a damaged tooth to a controller 38.
  • the controller 38 may actuate a warning device or shut down the passenger conveyor 10. To avoid false readings, die detector
  • die detector 36 is preferably configured to transmit the warning message only when d e signal strengd is below a predetermined direshold.
  • die detector 36 includes a relay 40 energized by a voltage source 42 connected to the signal line 32 so d at when a comb plate tooth 24 is broken, die relay 40 loses power and opens a safety circuit (not shown) of die conveyor 10 thereby shutting down d e conveyor 10 or actuates a warning-signaling device to issue a warning to the passengers or an operator of d e conveyor 10.
  • a suitable connecting device such as for example spring contacts
  • FIG. 6 schematically depicts a comb plate 20 in which the circuit board 31 comprises a parallel circuit wherein a resistive element 60 is formed at each of d e comb plate teeth 24 such that damage to one or more comb teeth 24 results in a change of electrical current through die circuit.
  • the detector 36 senses the change in electrical current and causes the controller 38 to actuate a warning device and/or shut off the conveyor drive mechanism.
  • d e number of broken comb teeth may be determined by measuring or monitoring changes in die equivalent resistance of the parallel circuit or d e signal strengdi of die entire parallel circuit. Depending on die damage severity, d e detector 36 may shut down die passenger conveyor 10 or issue a warning signal indicating the comb plate 20 has sustained damage.
  • Fig. 7 schematically illustrates a comb plate 20 incorporating a fluid chamber 62 having a plurality of channels 64 extending into die comb plate teedi 24.
  • the fluid chamber 62 and channels 64 may be filled widi a fluid (e.g., air, antifreeze liquid, etc.) and pressurized to a predetermined pressure by a pressure regulator 66 so diat when a comb plate toodi 24 is broken, fluid is lost and a pressure sensor 68 for sensing pressure in die fluid chamber sends a signal to die controller 38.
  • the controller 38 responds to the signal from the pressure sensor 66 and causes a warning device to issue a warning to an operator of the passenger conveyor 10, and/or sends a control signal to a safety circuit to shut down the passenger conveyor 10.
  • the fluid in die fluid chamber 62 and channels 64 may comprise an electrical conductive fluid.
  • the circuit of Figs. 3 and 5 may be connected to the ends of die fluid chamber 62 for conducting an electric signal through the fluid. When one of the comb fingers 24 breaks, the fluid drains from the comb plate section of that finger 24 and disrupts the signal.
  • a negative pressure may be created in the fluid chamber 62 so diat when a comb plate tooth 24 is broken, the fluid chamber 62 loses the negative pressure.
  • a pressure sensor 68 e.g., a micro pressure switch disposed in die fluid chamber 62 then responds to the loss of negative pressure and sends a signal to d e controller 38.
  • the controller 38 may shut down die passenger conveyor 10 (by, for example, opening a safety circuit) and/or actuate a warning device.
  • Figs. 7 and 8 may be formed using gas-assisted injection molding technology. According to d is mediod, gas is injected into die plastic as the comb plate is being molded so as to form d e fluid chamber 62.

Landscapes

  • Escalators And Moving Walkways (AREA)
  • Warehouses Or Storage Devices (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

L'invention concerne un appareil permettant de surveiller automatiquement l'intégrité structurelle des dents d'un peigne de bande transporteuse de personnes par établissement d'un chemin de signal électrique ou de pression le long de chacune des dents du peigne. Ledit chemin de signal est surveillé par un moniteur, et la dent de peigne endommagée est détectée en fonction d'une variation du signal qui se propage dans le chemin de signal. Lors de la détection d'une dent endommagée, le contrôleur coupe l'alimentation de la bande transporteuse de personnes, et/ou indique que le personnel de service du peigne est requis.
PCT/CH2001/000497 2000-08-18 2001-08-14 Procede et appareil permettant de surveiller et de detecter les dents abimees ou manquantes d'un peigne de bande transporteuse de personnes Ceased WO2002014201A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
AU2001279538A AU2001279538A1 (en) 2000-08-18 2001-08-14 Method and apparatus for monitoring the teeth of a comb plate for a passenger conveyor
BRPI0107124-6A BR0107124B1 (pt) 2000-08-18 2001-08-14 aparelho para detectar um ou mais dentes danificados de uma placa pente de um transportador de passageiros.
CA002385272A CA2385272A1 (fr) 2000-08-18 2001-08-14 Procede et appareil permettant de surveiller et de detecter les dents abimees ou manquantes d'un peigne de bande transporteuse de personnes
DE60140258T DE60140258D1 (de) 2000-08-18 2001-08-14 Verfahren und vorrichtung zur überwachung von kammplattenzähnen für personenbeförderer
EP01957674A EP1309510B1 (fr) 2000-08-18 2001-08-14 Procede et appareil permettant de surveiller et de detecter les dents abimees ou manquantes d'un peigne de bande transporteuse de personnes
AT01957674T ATE446274T1 (de) 2000-08-18 2001-08-14 Verfahren und vorrichtung zur überwachung von kammplattenzähnen für personenbeförderer

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US64254200A 2000-08-18 2000-08-18
US09/642,542 2000-08-18

Publications (1)

Publication Number Publication Date
WO2002014201A1 true WO2002014201A1 (fr) 2002-02-21

Family

ID=24577018

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CH2001/000497 Ceased WO2002014201A1 (fr) 2000-08-18 2001-08-14 Procede et appareil permettant de surveiller et de detecter les dents abimees ou manquantes d'un peigne de bande transporteuse de personnes

Country Status (8)

Country Link
EP (1) EP1309510B1 (fr)
CN (1) CN1174912C (fr)
AT (1) ATE446274T1 (fr)
AU (1) AU2001279538A1 (fr)
BR (1) BR0107124B1 (fr)
CA (1) CA2385272A1 (fr)
DE (1) DE60140258D1 (fr)
WO (1) WO2002014201A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004069725A1 (fr) * 2003-02-07 2004-08-19 Otis Elevator Company Peigne pour escalier mecanique equipe d'une membrure mobile
CN105324324A (zh) * 2013-06-26 2016-02-10 株式会社美州高科技 自动扶梯的安全梳齿板

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4772085B2 (ja) * 2008-06-18 2011-09-14 株式会社日立製作所 乗客コンベア
EP2468676A1 (fr) * 2010-12-22 2012-06-27 Inventio AG Dispositif de transport pour personnes et/ou objets
CN102320514A (zh) * 2011-09-09 2012-01-18 王锡林 一种自动扶梯安全制动方法及装置
DE112013003675A5 (de) * 2012-07-24 2015-04-16 Thyssenkrupp Fahrtreppen Gmbh Fahrtreppe oder Fahrsteig mit Sicherheitseinrichtung
CN105984801B (zh) * 2014-09-12 2019-02-19 东芝电梯株式会社 乘客输送机
CN107614414B (zh) * 2015-06-03 2019-05-07 三菱电机株式会社 乘客输送机
CN107662875B (zh) 2016-07-29 2021-07-06 奥的斯电梯公司 乘客运输机的梯级与梳齿板的啮合状态监检测
CN112340587B (zh) * 2020-10-27 2023-07-14 厦门市特种设备检验检测院 一种用于梳齿板的梳齿检测系统及梳齿检测方法
CN114720513A (zh) * 2022-05-11 2022-07-08 张峰 一种道路路面地质信息监测预警装置及方法
US20250051140A1 (en) * 2023-08-10 2025-02-13 Otis Elevator Company System for detecting broken combplate teeth of an escalator

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3233717A (en) * 1963-04-05 1966-02-08 Hitachi Ltd Safety device for escalators
US4088219A (en) * 1975-06-24 1978-05-09 Dunlop Limited Passenger conveyors
JPH0725575A (ja) * 1993-07-14 1995-01-27 Mitsubishi Denki Bill Techno Service Kk エスカレータの櫛歯破損検出装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3233717A (en) * 1963-04-05 1966-02-08 Hitachi Ltd Safety device for escalators
US4088219A (en) * 1975-06-24 1978-05-09 Dunlop Limited Passenger conveyors
JPH0725575A (ja) * 1993-07-14 1995-01-27 Mitsubishi Denki Bill Techno Service Kk エスカレータの櫛歯破損検出装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1995, no. 04 31 May 1995 (1995-05-31) *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004069725A1 (fr) * 2003-02-07 2004-08-19 Otis Elevator Company Peigne pour escalier mecanique equipe d'une membrure mobile
US7353931B2 (en) 2003-02-07 2008-04-08 Otis Elevator Company Comb plate for passenger conveyor with moving flange
CN105324324A (zh) * 2013-06-26 2016-02-10 株式会社美州高科技 自动扶梯的安全梳齿板
JP2016523218A (ja) * 2013-06-26 2016-08-08 ミジュハイテク カンパニー リミテッドＭｉｊｕｈｉｔｅｃ Ｃｏ．，Ｌｔｄ． エスカレータの安全コームプレート
CN105324324B (zh) * 2013-06-26 2017-12-19 株式会社美州高科技 自动扶梯的安全梳齿板

Also Published As

Publication number Publication date
CA2385272A1 (fr) 2002-02-21
BR0107124B1 (pt) 2010-09-21
BR0107124A (pt) 2002-06-18
AU2001279538A1 (en) 2002-02-25
ATE446274T1 (de) 2009-11-15
DE60140258D1 (de) 2009-12-03
EP1309510B1 (fr) 2009-10-21
EP1309510A1 (fr) 2003-05-14
CN1386106A (zh) 2002-12-18
CN1174912C (zh) 2004-11-10

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