EP0197620A2 - Zylinderverriegelungseinrichtung - Google Patents

Zylinderverriegelungseinrichtung Download PDF

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Publication number
EP0197620A2
EP0197620A2 EP86300228A EP86300228A EP0197620A2 EP 0197620 A2 EP0197620 A2 EP 0197620A2 EP 86300228 A EP86300228 A EP 86300228A EP 86300228 A EP86300228 A EP 86300228A EP 0197620 A2 EP0197620 A2 EP 0197620A2
Authority
EP
European Patent Office
Prior art keywords
brake members
piston rod
cylinder
members
locking device
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.)
Granted
Application number
EP86300228A
Other languages
English (en)
French (fr)
Other versions
EP0197620A3 (en
EP0197620B1 (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
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 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.
  • the present inventors have already proposed in Japanese patent application NO. 192272/1982 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 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.
  • an object of the present invention is to provide 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 even that a fluid pressure source or a power source is turned off for any reason.
  • a locking device for the piston of a fluid pressure cylinder comprising two nearly semi-cylindrical brake members formed in effect from a thick-walled cylinder, whose outer and inner circumferential surfaces are in eccentric relation, and which is divided in two in the axial direction in the regions of maximum and minimum thickness of the cylinder, and support members for rotatably supporting outer peripheral portions of the two brake members, with a piston rod of the fluid pressure cylinder slidably fitted within the inner circumferential portions of the brake members, such that said piston rod can be locked by relative angular displacement of the two brake members in opposite directions, characterized by a spring which is arranged to bias the two brake members in a direction to lock the piston rod, and an actuator for selectively rotating the brake members against the biasing force of the spring in a direction to release the locking action of the brake members on the piston rod.
  • 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 the centre 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 F ig. 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 apar ishooked 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 upper 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 uppers 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 cirumference of the support members 8, 9, i.e., the centre 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 graspsed 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 grapsed by the two nearly semi-cylinderical 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.
EP86300228A 1985-04-09 1986-01-15 Zylinderverriegelungseinrichtung Expired EP0197620B1 (de)

Applications Claiming Priority (2)

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

Publications (3)

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

Cited By (5)

* 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
EP0446694A1 (de) * 1990-03-14 1991-09-18 UNIVER S.p.A. Druckluftzylinder mit Verriegelungseinrichtung
DE19543471C1 (de) * 1995-11-22 1997-01-09 Festo Kg Klemmeinheit
WO2000074892A2 (de) * 1999-06-07 2000-12-14 Frenotech Establishment Feststelleinrichtung
DE19934750B4 (de) * 1999-06-07 2010-03-11 Frenotech Establishment Feststelleinrichtung

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2597150B2 (ja) * 1988-06-23 1997-04-02 明男 松井 シリンダ停止装置
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

Citations (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
DE2850561A1 (de) * 1977-12-27 1979-06-13 Shoketsu Kinzoku Kogyo Kk Bremsvorrichtung

Patent Citations (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
DE2850561A1 (de) * 1977-12-27 1979-06-13 Shoketsu Kinzoku Kogyo Kk Bremsvorrichtung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 8, no. 195 (M-323)[1632], 7th September 1984; & JP - A - 5 983 810 (AKIO MATSUI) 15-05-1984 *

Cited By (7)

* 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
EP0446694A1 (de) * 1990-03-14 1991-09-18 UNIVER S.p.A. Druckluftzylinder mit Verriegelungseinrichtung
DE19543471C1 (de) * 1995-11-22 1997-01-09 Festo Kg Klemmeinheit
FR2741406A1 (fr) * 1995-11-22 1997-05-23 Festo Kg Unite de serrage pour l'immobilisation d'une tige axialement mobile
WO2000074892A2 (de) * 1999-06-07 2000-12-14 Frenotech Establishment Feststelleinrichtung
WO2000074892A3 (de) * 1999-06-07 2002-10-31 Frenotech Establishment Feststelleinrichtung
DE19934750B4 (de) * 1999-06-07 2010-03-11 Frenotech Establishment Feststelleinrichtung

Also Published As

Publication number Publication date
KR920004066B1 (ko) 1992-05-23
KR860008379A (ko) 1986-11-15
DE3662548D1 (en) 1989-04-27
EP0197620A3 (en) 1987-04-01
EP0197620B1 (de) 1989-03-22
JPS61233209A (ja) 1986-10-17

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