EP0446694A1 - Dispositif de verrouillage pour vérin pneumatique - Google Patents

Dispositif de verrouillage pour vérin pneumatique Download PDF

Info

Publication number: EP0446694A1
Authority: EP; European Patent Office
Prior art keywords: rod; jaw; locking; control means; thrust
Prior art date: 1990-03-14
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

EP91102752A

Other languages

German (de)

English (en)

Other versions

EP0446694B1 (fr

Inventor

Luciano Migliori

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.)

Univer SpA

Original Assignee

Univer SpA

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.)

1990-03-14

Filing date

1991-02-25

Publication date

1991-09-18

1991-02-25 Application filed by Univer SpA filed Critical Univer SpA

1991-09-18 Publication of EP0446694A1 publication Critical patent/EP0446694A1/fr

1994-11-09 Application granted granted Critical

1994-11-09 Publication of EP0446694B1 publication Critical patent/EP0446694B1/fr

2011-02-25 Anticipated expiration legal-status Critical

Status Expired - Lifetime legal-status Critical Current

Links

Images

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
- F15B15/262—Locking mechanisms using friction, e.g. brake pads

Definitions

the present invention relates to a pneumatically actuated locking device for stoping the reciprocation movement in rod and rodless types of pneumatic cylinders, by means of which it is possible to exert a considerable instantaneous force so as to lock any moving member connected to the cylinder.
Such locking devices must operate each time an anomalous working condition occurs in the compressed-air supply network, in order to block the movement of the movable portion of the cylinder or of mechanical parts connected thereto, or in order to perform given functions during an operative cycle.
the locking devices of the type referred above have only a limited number of applications owing to their excessively large overall dimensions, and a limited degree of operational reliability, furthermore they are unable to operate in both movement directions of the 10. cylinder and tend to exert excessively high specific locking pressure forces, which compromise the sealing and the proper operation of the cylinder.
a scope of present invention is to provide a locking device for pneumatic cylinders in order to solve the problems arising from previously known locking devices, in particular to reduce the overall dimensions, increase the locking forces while maintaining the specific pressures at sufficiently low levels, and at the same time allowing application of the device to any pneumatic cylinder, with or without a rod, while maintaining a high degree of efficiency in both operative directions.
a locking device for pneumatic cylinders in which the cylinder comprises: a first cylinder portion and a second cylinder portion which is reciprocable in respect to the former one, said device comprising a housing defining an open chamber at both ends, a locking rod passing through said open chamber, said rod being operationally connected to one of said first and second cylinder portions, and locking means in said chamber interacting with said rod, said locking means comprising a U-shaped jaw member peripherally arranged around said rod, and pneumatically actuated control means to lock said jaw member against said rod, said control means comprising a thrust piston member and a reaction member opposite located and contacting said jaw, said thrust member and said reaction member comprising slanted surfaces to contact said locking jaw.
Figure 1 shows a pneumatic cylinder comprising a cylinder barrel 10, or first cylinder portion, in which a reciprocable piston member 11 slide; the piston 11 define a second cylinder portion connected to a rod 12 which protrudes in a sealed manner through an head 13 of the cylinder.
14 denotes a locking device for stopping and/or retaining the piston 11, as well as an operative member (not shown) connected to the reciprocable portion of the cylinder, in a fixed position according to the requirements; in the example shown, the locking device 14 is directly connected to the end part 13 of the cylinder. It is obvious, however, that the locking device 14 may be differently arranged and provided also in rodless cylinders, and the like.
the locking device 14 comprises a housing or hollow body 15 defining a chamber 16 open at both ends, through which the rod 12 of the cylinder axially slides.
a pneumatically actuated locking means comprising an U-shaped locking jaw member 17 peripherally arranged to engage an disengage by arms 17a, 17b against the rod 12 so as to block its movement instantly.
the jaw member 17 is positioned between pneumatically actuated control means comprising a thrust piston member 21 and a reaction member 20 provided with centering surfaces and thrust amplifying surfaces means.
the U-shaped jaw member 17 comprises lateral arms 17a and 17b and an intermediate bottom portion 17c defining an elastically yieldable connecting member for said arms 17a, 17b.
said arms 17a, 17b and said bottom portion 17c of the jaw define a circular inner surface 18 which slightly fits against most of the circumferential periphery of the rod 12; the bottom portion 17c of the jaw 17 rests against opposing slanted surfaces 19 of the reaction member 20 which diverges towards the rod 12 thus maintaining a self-centring arrangement of the jaw 17.
the bottom portion 17c of the jaw 17 has a reduced thickness so as to allow elastic yielding of the jaw arms 17a, 17b against the rod 12, under the action of the upper thrust member 21 and reaction member 20; therefore, the arms 17a and 17b of the jaw extend in the direction of and towards the thrust member 21, terminating at their ends with opposite slanted surfaces which fit against corresponding slanted surfaces 22 of the above mentioned thrust member 21, to increase the locking forces of the jaw member 17 acting on the rod 12 by a sliding forward movement of the thrust member 21.
the thrust member 21 is pneumatically operated by a piston 23 reciprocable in an annular chamber 24 inside the body 15.
the side of the chamber 24 which is opposite to the thrust member 21 is connected by a duct 25 to an inlet 26 for the compressed air.
a biasing means such as spring 27 acting in the same direction of the compressed air, may be provided behind the piston 23 of the thrust member 21, as shown in Figure 2, to force the thrust member 21 forward to lock the rod 12 and/or to maintain said rod 12 locked also in absence of compressed air.
Disengagement of the jaw from the rod 12 may be performed, for example, as shown in Figure 2, by providing pneumatically actuated jaw disengaging means; said means comprises a second piston 27 on the side of the reaction member 20 which is opposite to thrust member 21.
the piston 27 is reciprocable inside a chamber 28 which may be supplied with a fluid under pressure, for example compressed air via a duct 29 and an opening 30 on the side of the chamber 28 which is opposite to the reaction member 20, as shown in figure 2.
the piston 27 acts on the thrust member 21, upon release of the pneumatic force, for example by means of pins 31, or any suitable or equivalent means, which pins freely pass and slide through holes 32 in the reaction member 20, so as to extend parallelly to the arms 17a, 17b of the locking jaw 17, towards and against the abovementioned thrust member 21.
a biasing spring 33 may be optionally provided between the piston 27 and an end wall portion of housing 15 so as to push the piston 27 and the thrust member 21 in the disengaged condition of the jaw 17.
the operation mode of the locking device is as follows: during normal operation of the cylinder 10, the pressurised air is fed inside the chamber 28 for the piston 27 to deactivate the locking device; in this condition the piston 27 acts, via the pins 31, on the thrust member 21 so as to cause it to move backwards briefly, by an amount sufficient to allow disengagement of the jaw 17 and sliding of the rod 12 of the cylinder.
the U-shaped jaw 17 is able to extend axially or parallelly to the rod by an amount sufficient to allow high locking forces, while maintaining low specific pressures so as not to harm or cause any damage to the rod itself.
the spring 27, which acts on the thrust member 21 in opposition to the spring 33, is able to exert a greater force such that the device is operationally in a condition where the rod 12 is locked in the absence of pressurised fluid; however, it is obvious that the arrangement could be reversed, with a device operating under normally disengaged conditions.

Landscapes

Engineering & Computer Science (AREA)
Physics & Mathematics (AREA)
Fluid Mechanics (AREA)
Mechanical Engineering (AREA)
General Engineering & Computer Science (AREA)
Jigs For Machine Tools (AREA)
Actuator (AREA)
Fluid-Pressure Circuits (AREA)
Supply Devices, Intensifiers, Converters, And Telemotors (AREA)

EP91102752A 1990-03-14 1991-02-25 Dispositif de verrouillage pour vérin pneumatique Expired - Lifetime EP0446694B1 (fr)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
IT19671A IT1239695B (it)	1990-03-14	1990-03-14	Dispositivo di ritenuta per cilindri pneumatici
IT1967190		1990-03-14

Publications (2)

Publication Number	Publication Date
EP0446694A1 true EP0446694A1 (fr)	1991-09-18
EP0446694B1 EP0446694B1 (fr)	1994-11-09

Family

ID=11160270

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP91102752A Expired - Lifetime EP0446694B1 (fr)	1990-03-14	1991-02-25	Dispositif de verrouillage pour vérin pneumatique

Country Status (5)

Country	Link
EP (1)	EP0446694B1 (fr)
AT (1)	ATE114022T1 (fr)
DE (1)	DE69105009T2 (fr)
ES (1)	ES2064784T3 (fr)
IT (1)	IT1239695B (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE19543471C1 (de) *	1995-11-22	1997-01-09	Festo Kg	Klemmeinheit
WO2000074892A3 (fr) *	1999-06-07	2002-10-31	Frenotech Establishment	Dispositif de fixation
EP1170511A3 (fr) *	2000-07-07	2006-09-20	Frenotech Establishment	Dispositif de verrouillage

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE202018005634U1 (de) *	2018-12-09	2020-03-11	Herbert Höfler	Feststelleinrichtung

Citations (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
EP0197620A2 (fr) *	1985-04-09	1986-10-15	Akio Matsui.	Dispositif de blocage pour cylindre
US4791855A (en) *	1985-03-11	1988-12-20	Pubot Giken Co., Ltd.	Cylinder locking device
DE3810388A1 (de) *	1988-03-26	1989-10-05	Kontec Gmbh	Vorrichtung zum festspannen eines linear bewegbaren, langgestreckten bauteils

1990
- 1990-03-14 IT IT19671A patent/IT1239695B/it active IP Right Grant
1991
- 1991-02-25 AT AT91102752T patent/ATE114022T1/de not_active IP Right Cessation
- 1991-02-25 EP EP91102752A patent/EP0446694B1/fr not_active Expired - Lifetime
- 1991-02-25 DE DE69105009T patent/DE69105009T2/de not_active Expired - Fee Related
- 1991-02-25 ES ES91102752T patent/ES2064784T3/es not_active Expired - Lifetime

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US4791855A (en) *	1985-03-11	1988-12-20	Pubot Giken Co., Ltd.	Cylinder locking device
EP0197620A2 (fr) *	1985-04-09	1986-10-15	Akio Matsui.	Dispositif de blocage pour cylindre
DE3810388A1 (de) *	1988-03-26	1989-10-05	Kontec Gmbh	Vorrichtung zum festspannen eines linear bewegbaren, langgestreckten bauteils

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
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
WO2000074892A3 (fr) *	1999-06-07	2002-10-31	Frenotech Establishment	Dispositif de fixation
EP1170511A3 (fr) *	2000-07-07	2006-09-20	Frenotech Establishment	Dispositif de verrouillage

Also Published As

Publication number	Publication date
IT1239695B (it)	1993-11-15
ATE114022T1 (de)	1994-11-15
EP0446694B1 (fr)	1994-11-09
DE69105009T2 (de)	1995-04-20
ES2064784T3 (es)	1995-02-01
IT9019671A1 (it)	1991-09-14
DE69105009D1 (de)	1994-12-15
IT9019671A0 (it)	1990-03-14

Legal Events

Date	Code	Title	Description
1991-08-02	PUAI	Public reference made under article 153(3) epc to a published international application that has entered the european phase	Free format text: ORIGINAL CODE: 0009012
1991-09-18	AK	Designated contracting states	Kind code of ref document: A1 Designated state(s): AT CH DE ES FR GB LI NL SE
1992-03-04	17P	Request for examination filed	Effective date: 19911220
1993-08-18	17Q	First examination report despatched	Effective date: 19930702
1994-09-23	GRAA	(expected) grant	Free format text: ORIGINAL CODE: 0009210
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1995-09-09	STAA	Information on the status of an ep patent application or granted ep patent	Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT
1995-11-02	26N	No opposition filed
2000-01-25	PGFP	Annual fee paid to national office [announced via postgrant information from national office to epo]	Ref country code: GB Payment date: 20000125 Year of fee payment: 10
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2001-02-25	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20010225
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