EP0197620B1 - Zylinderverriegelungseinrichtung - Google Patents

Zylinderverriegelungseinrichtung Download PDF

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Publication number
EP0197620B1
EP0197620B1 EP86300228A EP86300228A EP0197620B1 EP 0197620 B1 EP0197620 B1 EP 0197620B1 EP 86300228 A EP86300228 A EP 86300228A EP 86300228 A EP86300228 A EP 86300228A EP 0197620 B1 EP0197620 B1 EP 0197620B1
Authority
EP
European Patent Office
Prior art keywords
brake members
piston rod
cylinder
members
fluid pressure
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
Application number
EP86300228A
Other languages
English (en)
French (fr)
Other versions
EP0197620A3 (en
EP0197620A2 (de
Inventor
Akio Matsui.
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.)
Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0197620A2 publication Critical patent/EP0197620A2/de
Publication of EP0197620A3 publication Critical patent/EP0197620A3/en
Application granted granted Critical
Publication of EP0197620B1 publication Critical patent/EP0197620B1/de
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/26—Locking mechanisms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/26—Locking mechanisms
    • F15B15/262—Locking mechanisms using friction, e.g. brake pads

Definitions

  • the invention relates to a cylinder locking device for locking the piston rod of a fluid pressure cylinder at an arbitrary position, and more specifically to a cylinder locking device which can lock the piston rod automatically and securely in the event of a fault in a fluid pressure source.
  • JP-A-59-83 810 a cylinder locking device of a simple mechanical type which enables the piston rod of a fluid pressure cylinder to be securely locked at an arbitrary position.
  • a thick-walled cylinder having outer and inner circumferential surfaces in eccentric relation, is divided in two in the region of maximum thickness and the region of minimum thickness in the axial direction to form two thick semi-cylindrical brake members, and the piston rod of a fluid pressure cylinder is slidably fitted within the inner circumferential portion of the two semi-cylindrical brake members, these brake members, these brake members being rotatably fitted in a housing, and the two brake members being rotatable in opposite directions to each other whereby to lock the piston rod therebetween.
  • the cylinder locking device as described above can lock the piston rod using a relatively small force and without producing shearing or rotational forces on the piston rod.
  • a mechanism to operate the semi-cylindrical brake members automatically is required and so far no such mechanism has been available.
  • a cylinder locking device which can lock the piston rod of a fluid pressure cylinder automatically and which will reliably and safely lock the piston rod in the event that a fluid pressure source or a power source is turned off for any reason.
  • the coil spring is arranged between two brackets fixed respectively to the two brake members at one side thereof and is arranged to angularly bias the two brackets, and hence the two brake members, in opposite directions such as to lock the piston rod, and the actuator is arranged between two arms fixed respectively to the two brake members at the opposite sides thereof to said two brackets for selectively rotating the brake members against the biasing force of the coil spring in a direction to release the locking action of the brake members on the piston rod.
  • bushes made of fluororesin material are disposed at support portions of the support members for rotatably supporting the brake members.
  • the fluid pressure cylinder of Fig. 1 comprises a cylinder tube or wall 1, a cylinder head 2 and a cylinder cover 3, tightened and fixed at both ends of the cylinder tube 1 by one or more tie rods (not shown), a piston 4 fitted within the cylinder tube 1, and a piston rod 5 passing through the centre of the cylinder cover 3 and fixed at its base end to the piston 4.
  • a cylinder locking device is installed on the cylinder cover 3 and surrounds the outer circumference of the piston rod 5.
  • Numerals 6 and 7 designate nearly semi-cylindrical brake members arranged to embrace an outer circumferential portion of the piston rod 5.
  • the brake members 6, 7 are formed by taking a thick-walled cylinder which is arranged to have outer and inner circumferences which are in eccentric relation and dividing this cylinder into two about an axial plane which passes through the maximum thickness portion and the minimum thickness portion of the cylinder.
  • the two axial ends of both outer circumferential portions of the brake members 6, 7 are rotatably supported by support members 8, 9; respectively.
  • the support member 8 serves also as a housing on one end of the cylinder cover 3.
  • the piston rod 5 passes through the centre of the support member 8, a bearing metal being positioned at the support region.
  • the support member 9 includes a bearing metal fitted to the inside of a housing 10, an end portion of the housing 10 slidably supporting the piston rod 5.
  • Bushes 11 made of fluororesin as its starting material are interposed at the positions where the support members 8, 9 rotatably support the brake members 6, 7, whereby to decrease the sliding friction.
  • the nearly semi-cylindrical brake members 6, 7 have a respective circumferential space between each pair of opposing regions so that both members 6, 7 can be mutually rotated to some extent.
  • the centre of the circle including the outer circumference of the brake members 6, 7 is shifted slightly downwards relative to thecentre of the inner circumference thereof, i.e. relative to the central axis of the piston rod 5. Consequently, when the brake members 6, 7 are rotated in a direction to open the lower portion thereof as directed by the arrows in Fig. 2, the brake members 6, 7 are rotated in the support members 8, 9 for the outer circumference thereof and the piston rod 5 within the members 8, 9 is gripped from both sides and locked.
  • Brackets 12, 13 having an L-shaped cross-section are fixed to lower portions of the two brake members 6, 7 and a coil spring 14 for biasing the brackets 12, 13 apart is hooked in a compressed state between the brackets 12, 13.
  • the brake members 6, 7 are normally biased by the coil spring 14 into their position in which they lock the piston rod 5.
  • a fluid pressure actuator 20 is arranged between the two arms 15, 16 and is fixed to a mounting plate 17 mounted on an upper portion of the housing 10.
  • the fluid pressure actuator 20 comprises a cylinder 21, two pistons 22, 23 spaced from each other and fitted inside the cylinder 21, and pressure projections 24, 25 located on the outside of the two pistons 22, 23 for pushing the two arms 15, 16 apart.
  • the fluid pressure actuator 20 is energised to hold the upper portions of the arms 15, 16 apart whereby the brake members 6, 7 are in the non-braking state.
  • both pistons 22, 23 are moved outwards so as to urge the portions of the arms 15, 16 apart by way of the projections 24, 25.
  • the two brake members 6, 7, whose outer circumferential portion is supported in the support members 8, 9, and thus rotated against the biasing force of the coil springs 14 so as to open the circumferential gap between the upper portions of the brake members and to close the circumferential gap between the lower portions of those members.
  • the piston rod 5 Since the centre of the inner circumference of the support members 8, 9, i.e., the centre of the circle including the outer circumference of the brake members 6, 7, is shifted from the centre of the inner circumference of the brake members 6, 7, i.e., the centre of the circular section of the piston rod 5, the piston rod 5 is grasped by the brake members 6, 7 from both sides and thereby locked. The piston rod 5 can thus be locked without being subjected to shearing or rotational forces.
  • an electromagnetic actuator may be used in place of the fluid pressure actuator 20.
  • the piston rod since the piston rod is grasped by the two nearly semi-cylindrical brake members, it can be locked by a mechanical brake of simple structure without producing shearing or rotational forces, whereby the piston rod or the bearing parts therefor is prevented from deformation or abrasion and the piston rod can be stopped securely and reliably. Furthermore, since the brake members are normally biased in the locking direction by the spring, even if the fluid pressure source or the power source of the actuator is suddenly turned off as a result of a fault, the piston rod is immediately locked by the biasing force of the spring and safety is secured.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Braking Arrangements (AREA)

Claims (2)

1. Verriegelungseinrichtung für den Kolben (4) eines Flüssigkeitsdruckzylinders (1-5) mit zwei annähernd halbzylindrischen Bremselementen (6, 7), die effektiv aus einem dickwandigen Zylinder hergestellt sind, dessen äußere und innere Umfangsoberflächen in exzentrischer Beziehung stehen, und der in axialer Richtung in den Bereichen der maximalen und minimalen Dicke des Zylinders zweigeteilt ist, und mit Stützelementen (8, 9) für die drehbare Lagerung äußerer Umfangbereiche der zwei Bremselemente (6, 7), wobei eine Kolbenstange (5) des Flüssigkeitsdruckzylinders (1-5) drehbar in den inneren Umfangsbereichen der Bremselemente (6, 7) eingepaßt ist, so daß die Kolbenstange (5) durch eine relative Winkelverschiebung der zwei Bremselemente (6, 7) in entgegengesetzte Richtungen festgeklemmt werden kann, gekennzeichnet durch eine Spiralfeder (14), die zwischen zwei Klammern (12, 14) angeordnet ist, die jeweils an den zwei Bremselementen (6, 7) an einer Seite davon angebracht sind, und die angeordnet ist, um die zwei Klammern (12, 14) und so die zwei Bremselemente (6,7) in entgegengesetzten Richtungen winklig vorzuspannen, so daßdie Kolbenstange (5) festgeklemmt wird, und ein Betätigungsorgan (20), das zwischen zwei Armen (15, 16) angeordnet ist, die jeweils an den zwei Bremselementen (6,7) an den gegenüberliegenden Seiten zu den zwei Klammern (12, 14) befestigt sind, um selektiv die Bremselemente (6, 7) gegen die vorspannende Kraft der Spiralfeder (14) in einer Richtung zu drehen, um die festklemmende Wirkung der Bremselemente (6,.7) auf die Kolbenstange zu lösen.
2. Zylinderverriegelungseinrichtung nach Anspruch 1, dadurch gekennzeichnet, daß Büchsen (11) aus Fluorkunststoffmaterial an den Stützbereichen der Stützelemente (8, 9) vorgesehen sind, um drehbar die Bremselemente (6, 7) zu stützen.
EP86300228A 1985-04-09 1986-01-15 Zylinderverriegelungseinrichtung Expired EP0197620B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP74674/85 1985-04-09
JP60074674A JPS61233209A (ja) 1985-04-09 1985-04-09 シリンダ停止装置

Publications (3)

Publication Number Publication Date
EP0197620A2 EP0197620A2 (de) 1986-10-15
EP0197620A3 EP0197620A3 (en) 1987-04-01
EP0197620B1 true EP0197620B1 (de) 1989-03-22

Family

ID=13554007

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86300228A Expired EP0197620B1 (de) 1985-04-09 1986-01-15 Zylinderverriegelungseinrichtung

Country Status (4)

Country Link
EP (1) EP0197620B1 (de)
JP (1) JPS61233209A (de)
KR (1) KR920004066B1 (de)
DE (1) DE3662548D1 (de)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3744295A1 (de) * 1987-12-28 1989-07-13 Kontec Gmbh Klemmvorrichtung zum festklemmen einer linear beweglichen stange
JP2597150B2 (ja) * 1988-06-23 1997-04-02 明男 松井 シリンダ停止装置
IT1239695B (it) * 1990-03-14 1993-11-15 Univer Spa Dispositivo di ritenuta per cilindri pneumatici
DE19543471C1 (de) * 1995-11-22 1997-01-09 Festo Kg Klemmeinheit
DE19934750B4 (de) * 1999-06-07 2010-03-11 Frenotech Establishment Feststelleinrichtung
ATE281905T1 (de) * 1999-06-07 2004-11-15 Frenotech Establishment Feststelleinrichtung zum klemmen einer welle oder stange
JP4150993B2 (ja) * 2000-04-12 2008-09-17 Ｓｍｃ株式会社 揺動アクチュエータ
KR20020016669A (ko) * 2000-08-26 2002-03-06 배길훈 리어 허브 베어링 스템을 이용한 파킹 브레이크
JP4826764B2 (ja) * 2006-05-17 2011-11-30 株式会社パボット技研 直線ロッド停止装置
JP4965338B2 (ja) * 2007-05-23 2012-07-04 株式会社アイ・アンド・ティー シャフトブレーキ装置
JP5009106B2 (ja) * 2007-09-12 2012-08-22 株式会社アイ・アンド・ティー 直線運動体の制動装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3554094A (en) * 1969-02-20 1971-01-12 Bell Aerospace Corp Piston rod locking mechanism
DE2552994A1 (de) * 1975-11-26 1977-06-02 Gatermann Ingenieurbuero Gmbh Bremse fuer einen zylindrischen koerper
US4214795A (en) * 1977-11-25 1980-07-29 Shoketsu Kinzoku Kogyo Kabushiki Kaisha Piston braking device for hydraulic or pneumatic cylinders

Also Published As

Publication number Publication date
EP0197620A3 (en) 1987-04-01
KR920004066B1 (ko) 1992-05-23
DE3662548D1 (en) 1989-04-27
JPS61233209A (ja) 1986-10-17
KR860008379A (ko) 1986-11-15
EP0197620A2 (de) 1986-10-15

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