EP1407997B1 - Elevator device - Google Patents

Elevator device Download PDF

Info

Publication number
EP1407997B1
EP1407997B1 EP01948003A EP01948003A EP1407997B1 EP 1407997 B1 EP1407997 B1 EP 1407997B1 EP 01948003 A EP01948003 A EP 01948003A EP 01948003 A EP01948003 A EP 01948003A EP 1407997 B1 EP1407997 B1 EP 1407997B1
Authority
EP
European Patent Office
Prior art keywords
pull cable
pulley
passenger car
hoistway
counterweight
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.)
Expired - Lifetime
Application number
EP01948003A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1407997A4 (en
EP1407997A1 (en
Inventor
Koji c/o Mitsubishi Denki K.K. SHITAMIYA
Masami c/o Mitsubishi Denki K.K. YOSHIKAWA
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of EP1407997A1 publication Critical patent/EP1407997A1/en
Publication of EP1407997A4 publication Critical patent/EP1407997A4/en
Application granted granted Critical
Publication of EP1407997B1 publication Critical patent/EP1407997B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B11/00—Main component parts of lifts in, or associated with, buildings or other structures
    • B66B11/04—Driving gear ; Details thereof, e.g. seals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B15/00—Main component parts of mining-hoist winding devices
    • B66B15/02—Rope or cable carriers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B15/00—Main component parts of mining-hoist winding devices
    • B66B15/02—Rope or cable carriers
    • B66B15/04—Friction sheaves; "Koepe" pulleys

Definitions

  • the invention relates to an elevator system which causes a passenger car and a counterweight to ascend or descend by driving a pull cable with a hoisting machine.
  • JP-A-08337372 discloses an elevator pit with a smaller depth by furnishing a through hole in the pit floor, and supporting an oil damper in a condition that its middle part about the axial direction is inserted in the hole.
  • Fig. 4 is a schematic cross-sectional view showing the known elevator system.
  • the elevator system primarily comprises: a passenger car 1 into which passengers enter and which ascends and descends within a hoistway 10; a counterweight 2 which ascends or descends in a direction opposite a direction in which the passenger car 1 ascends or descends; a pull cable 3 (main cable) which suspends at one end thereof the passenger car 1 and suspends at the other end thereof the counterweight 2; a hoisting machine 4 (a hoisting motor) which is equipped with a pulley 5 and drives the pull cable 3 passed around the pulley 5; car guide rails 8 for guiding ascending and descending operations of the passenger car 1; and unillustrated counterweight guide rails for guiding ascending or descending the counterweight 2.
  • the hoisting machine 4 is supported on a support bench 11 mounted at the top section of the hoistway 10.
  • an upper guide device 7 (guide device) having a roller section or the like is fastened to an upper portion of the passenger car 1.
  • the roller section of the upper guide device 7 remains in contact with the surfaces of the guide rails 8.
  • Stoppers 9 for preventing the upper guide device 7 from becoming dislodged from the guide rails 8 are provided at upper ends of the respective guide rails 8 that guide ascending and descending operations of the passenger car 1.
  • the passenger car 1 ascends or descends along the passenger car guide rails 8 within a predetermined range in the hoistway 10 by means of driving of the pull cable 3 stemming from frictional transmission of the pulley 5.
  • the predetermined range within the hoistway 10 means an ordinary range of ascending and descending operations of the passenger car 1; that is, a range from an unillustrated elevator hall at the lowest floor to an elevator hall 6 at the highest floor.
  • the passenger car 1 may exceed the predetermined range within the hoistway 10, thereby further moving upward beyond the elevator hall 6 at the top floor.
  • the upper guide device 7 comes into contact with the stopper 9, thereby preventing dislodgment of the passenger car 1 from the guide rails 8.
  • the foregoing known elevator system has a potential risk of glitches arising in constituent members of the system, which could be caused when the upper guide device 7 comes into contact with the stopper 9 as a result of the passenger car 1 having exceeded the predetermined range within the hoistway 10.
  • the pulley 5 rotates at the same speed as in normal ascending and descending operations without deceleration of a rotation speed.
  • the upper guide device 7 collides with the stopper 9 at the same speed as that at which the passenger car 1 ascends or descends under normal operation.
  • the length of the guide rails 8 is set to a minimum required length within the hoistway in order to satisfy demand for space savings.
  • the length of the guide rails 8 is set so as to become slightly longer than the position of the elevator hall 6 at the top floor, thereby minimizing the height of the hoistway 10. Consequently, allowance for dislodgment of the passenger car 1 from the guide rails 8 becomes smaller as the length of the guide rails 8 becomes shorter. Hence, the foregoing problem comes further to the forefront.
  • the invention has been conceived to solve the problem set forth and aims at providing a high-quality, highly reliable elevator system which does not inflict any deformation or damage on constituent members of the system even when a passenger car ascends or descends beyond a predetermined range within a hoistway.
  • the invention is directed to an elevator system, wherein, when a passenger car attempts to ascend or descend beyond a predetermined range in a hoistway, a pulley of a hoisting machine is arranged to run idle with respect to the pull cable.
  • the improved elevator system of the invention when the passenger car attempts to ascend or descend beyond a predetermined range in the hoistway, an angle of contact between the pulley of the hoisting machine and the pull cable is reduced. As a result, even when the passenger car attempts to ascend or descend beyond a predetermined range in the hoistway, drive force is not transmitted from the pulley to the pull cable by means of friction, thereby preventing ascending or descending of the passenger car in excess of the predetermined range and inflicting of deformation or damage to constituent members of the system.
  • an engagement section of the pull cable is disengaged from a pulley and the pull cable is passed around the pulley having irregularities.
  • Fig. 1 is a schematic cross-sectional view showing a first preferable elevator system according to the invention.
  • the elevator system of the first embodiment is in principle constituted of a passenger car 1 which ascends and descends within a hoistway 10; a counterweight 2 which ascends or descends in a direction opposite the direction in which the passenger car 1 ascends or descends; a pull cable 3 which suspends at one end thereof the passenger car 1 and suspends at the other end thereof the counterweight 2; a hoisting machine 4 which is equipped with a pulley 5 and drives the pull cable 3 passed around the pulley 5; car guide rails 8 for guiding ascending and descending operations of the passenger car 1; and unillustrated counterweight guide rails for guiding ascending or descending operations of the counterweight 2.
  • the hoisting machine 4 is supported on a support bench 11 mounted at the top section of the hoistway 10.
  • an upper guide device 7 is fastened to an upper portion of the passenger car 1.
  • the upper guide device 7 remains in contact with the guide rails 8.
  • a low friction area 3a having a low coefficient of friction is formed in a portion of the pull cable 3 in a longitudinal direction thereof (i.e., a direction corresponding to the length of the cable).
  • the pull cable 3 is constituted of an area having an ordinary coefficient of friction required for the pulley 5 to effect friction transmission, and the low friction area 3a having a coefficient of friction lower than that of the area.
  • the pull cable 3 having the low friction area 3a is formed by means of filming or coating a desired location on the ordinary pull cable 3. Further, the low friction area 3a is formed at a position close to the passenger car 2 in the longitudinal direction of the pull cable 3.
  • a coefficient of friction of the low friction area 3a is set to a value sufficient for causing the pulley 5 to perform idle run when the low friction area 3a is passed around the pulley 5.
  • the passenger car 1 even when the passenger car 1 attempts to move beyond the predetermined range in the hoistway 10, the passenger car 1 does not move upward beyond the elevator hall 6 at the top floor, or exceeds the hall by only a nominal distance, thereby reliably hindering the passenger car 1 from becoming dislodged from the guide rails 8.
  • the pulley 5 runs idle with respect to the pull cable 3.
  • a high-quality, highly reliable elevator system which does not inflict deformation or damage to constituent members such as the guide rails 8, the passenger car 1, the hoisting machine 4, and the pull cable 3.
  • the first embodiment has described the elevator system in which the hoisting machine 4 is mounted at the top section of the hoistway 10.
  • the invention can also be applied to an elevator system in which the hoisting machine 4 is mounted at another location; for example, the bottom of the hoistway 10.
  • the position of the low friction area 3a of the pull cable 3 is located at a corresponding position.
  • a case where the passenger car 1 exceeds a predetermined range within the hoistway 10 means a case where the passenger car 1 moves beyond the top floor.
  • the first embodiment can also be applied to a case where the passenger car 1 is moved downward beyond the lowest floor.
  • the low friction area 3a of the pull cable 3 is provided at a position closer to the counterweight 2, thereby yielding the same advantage as that yielded in the first embodiment.
  • Fig. 2 is a schematic cross-sectional view showing a second preferable elevator system of the invention.
  • the elevator system of the second embodiment is constituted of the passenger car 1; the counterweight 2; the pull cable 3; the hoisting machine 4 having the pulley 5; the passenger car guide rail 8; and an unillustrated counterweight guide rail.
  • a pedestal 12 for receiving the load of the counterweight 2 is positioned at the bottom in the hoistway 10.
  • the pedestal 12 is formed so as to come into contact with the counterweight 2 in the event that the passenger car 1 has moved beyond the elevator hall 6 at the top floor in excess of a predetermined range in the hoistway 10 and the counterweight 2 has moved downward beyond a predetermined range.
  • the pedestal 12 is formed from material having an impact absorption characteristic; e.g., vibration-proof rubber.
  • a follower pulley 16 Disposed in the top section of the hoistway 10 where the hoisting machine 4 is installed are a follower pulley 16 which remains in contact with the pull cable 3 at a position between the pulley 5 and the counterweight 2, and a tension spring 15 which supports at one end thereof the follower pulley 16 and is at the other end thereof supported on a wall of the hoistway 10.
  • the tension spring 15 for supporting the follower pulley 16 has spring force sufficient for drawing the pull cable 3 toward the wall of the hoistway 10 when the tensile force exerted on the pull cable 3 by the counterweight 2 has become smaller than ordinary force.
  • the follower pulley 16 comes into contact with the pull cable 3 at a predetermined location (i.e., a position designated by a two-dot chain line in the drawing), thereby sustaining an angle of contact between the pull cable 3 and the pulley 5 at an angle of about 180°.
  • the follower pulley 16 moves from the predetermined position under the spring force of the tensile spring 15 (i.e., toward a position designated by a solid line in a direction indicated by an arrowhead), thereby reducing the angle of contact between the pull cable 3 and the pulley 5.
  • the angle of contact signifies that a range of the pull cable 3 passed around the pulley 5 is designated by an angle when viewed from the rotational center of the pulley 5.
  • the pedestal 12 receives the load of the counterweight 2, thereby reducing the tensile force of the pull cable 3 exerted by the counterweight 2.
  • the follower pulley 16 draws the portion of the pull cable 3 close to the counterweight 2 whose tensile force has been reduced, in a direction in which the angle of contact between the pulley 5 and the pull cable 3 is to be reduced.
  • the portion of the pull cable 3 close to the counterweight 2 is subjected to tensile force substantially equal to that exerted on the passenger car 1.
  • the pulley 5 runs idle with respect to the pull cable 3.
  • a high-quality, highly reliable elevator system which does not inflict deformation or damage to constituent members such as the guide rails 8, the passenger car 1, the hoisting machine 4, and the pull cable 3.
  • Fig. 3 is a schematic cross-sectional view showing a third preferable elevator system of the invention.
  • the elevator system of the third embodiment is constituted of the passenger car 1; the counterweight 2; a pull cable 19 which suspends the passenger car 1 and the counterweight 2 at the ends; the hoisting machine 4 having the pulley 18 around which the pull cable is passed; the passenger car guide rail 8; and an unillustrated counterweight guide rail.
  • a pulley 18 of the hoisting machine 4 is formed from, e.g., a sprocket, in a circumference of which irregularities are formed at uniform pitches.
  • the pull cable 19 is a belt, in a portion of which in a longitudinal direction an engagement section 19b to mesh the irregularities of the pulley 18 is formed; for example, a toothed belt matching a toothed shaped of the sprocket.
  • a non-engagement section 19a which does not engage the irregularities of the pulley 18 is formed in a portion of the pull cable 19 close to the passenger car 1.
  • the engagement section 19b of the pull cable 19 engages irregularities of the pulley 18.
  • the pulley 18 actuates the pull cable 19 by means of engagement transmission, thus causing the passenger car 1 and the counterweight 2 to ascend or descend.
  • an elevator system of the invention when a passenger car attempts to ascend or descend beyond a predetermined range in a hoistway, a pulley of a hoisting machine is arranged to run idle with respect to the pull cable. As a result, even when the passenger car attempts to ascend or descend beyond a predetermined range in the hoistway, ascending or descending of the passenger car 1 beyond the predetermined range can be prevented. Hence, there can be provided a high-quality, highly reliable elevator system which does not inflict deformation or damage to constituent members of the system.
  • the elevator system of the invention when the passenger car attempts to ascend or descend beyond a predetermined range in the hoistway, a low friction area of a pull cable is passed around a pulley of a hoisting machine. As a result, even when the passenger car attempts to ascend or descend beyond a predetermined range in the hoistway, drive force is not transmitted from the pulley to the pull cable by means of friction, thereby preventing ascending or descending of the passenger car in excess of the predetermined range. Hence, there can be provided a high-quality, highly reliable elevator system which does not inflict deformation or damage to constituent members of the system.
  • the elevator system of the invention when the passenger car attempts to ascend or descend beyond a predetermined range in the hoistway, an angle of contact between the pulley of the hoisting machine and the pull cable is reduced. As a result, even when the passenger car attempts to ascend or descend beyond a predetermined range in the hoistway, drive force is not transmitted from the pulley to the pull cable by means of friction, thereby preventing ascending or descending of the passenger car in excess of the predetermined range. Hence, there can be provided a high-quality, highly reliable elevator system which does not inflict deformation or damage to constituent members of the system.

Landscapes

  • Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Lift-Guide Devices, And Elevator Ropes And Cables (AREA)
  • Cage And Drive Apparatuses For Elevators (AREA)
EP01948003A 2001-07-13 2001-07-13 Elevator device Expired - Lifetime EP1407997B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2001/006079 WO2003008321A1 (en) 2001-07-13 2001-07-13 Elevator device

Publications (3)

Publication Number Publication Date
EP1407997A1 EP1407997A1 (en) 2004-04-14
EP1407997A4 EP1407997A4 (en) 2010-02-17
EP1407997B1 true EP1407997B1 (en) 2011-10-19

Family

ID=11737543

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01948003A Expired - Lifetime EP1407997B1 (en) 2001-07-13 2001-07-13 Elevator device

Country Status (5)

Country Link
EP (1) EP1407997B1 (ja)
JP (1) JP4862244B2 (ja)
KR (1) KR100535901B1 (ja)
CN (1) CN1206153C (ja)
WO (1) WO2003008321A1 (ja)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004113219A2 (en) * 2003-06-18 2004-12-29 Toshiba Elevator Kabushiki Kaisha Sheave for elevator
TW200710013A (en) * 2005-07-25 2007-03-16 Inventio Ag Installation with support means for driving a lift cage, and corresponding support means
ES2294944B1 (es) * 2006-09-25 2009-02-16 Orona S. Coop Elemento de suspension y traccion para aparatos elevadores y aparato elevador.
EP2985255B1 (en) 2014-08-11 2021-11-17 KONE Corporation Elevator
CN108996374A (zh) * 2018-10-06 2018-12-14 湖州巨创电梯部件有限公司 防偏移牵引装置

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0393573A (ja) * 1989-09-07 1991-04-18 Canon Inc ベルト駆動装置及び前記ベルト駆動装置を用いた記録装置
JPH05262469A (ja) * 1992-03-18 1993-10-12 Mitsubishi Electric Corp エレベータの制御装置
JP3152001B2 (ja) * 1993-03-26 2001-04-03 三菱電機株式会社 エレベーター装置
JPH07237853A (ja) * 1994-02-24 1995-09-12 Mitsubishi Denki Bill Techno Service Kk エレベーターのロープテンション調整方法
JP3137832B2 (ja) * 1994-05-11 2001-02-26 帝人株式会社 ロープ状物
JPH08217366A (ja) * 1995-02-13 1996-08-27 Hitachi Ltd エレベータ駆動装置
JP3494507B2 (ja) 1995-06-14 2004-02-09 株式会社日立製作所 免震建物のエレベータピット構造
JP3485802B2 (ja) * 1998-07-31 2004-01-13 三洋電機株式会社 スライド部材駆動装置
JP2000118914A (ja) * 1998-10-08 2000-04-25 Hitachi Building Systems Co Ltd エレベータ用主ロープの張力補正装置

Also Published As

Publication number Publication date
EP1407997A4 (en) 2010-02-17
KR20030034246A (ko) 2003-05-01
CN1206153C (zh) 2005-06-15
KR100535901B1 (ko) 2005-12-09
CN1469838A (zh) 2004-01-21
JPWO2003008321A1 (ja) 2004-11-04
JP4862244B2 (ja) 2012-01-25
WO2003008321A1 (en) 2003-01-30
EP1407997A1 (en) 2004-04-14

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