DE3872222D1 - LOCKABLE HYDRAULIC CYLINDER. - Google Patents
LOCKABLE HYDRAULIC CYLINDER.Info
- Publication number
- DE3872222D1 DE3872222D1 DE8888908198T DE3872222T DE3872222D1 DE 3872222 D1 DE3872222 D1 DE 3872222D1 DE 8888908198 T DE8888908198 T DE 8888908198T DE 3872222 T DE3872222 T DE 3872222T DE 3872222 D1 DE3872222 D1 DE 3872222D1
- Authority
- DE
- Germany
- Prior art keywords
- piston
- ball
- hydraulic cylinder
- cylinder
- spring
- 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
Links
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
- F15B15/261—Locking mechanisms using positive interengagement, e.g. balls and grooves, for locking in the end positions
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Actuator (AREA)
Abstract
The piston (3) of a hydraulic cylinder (1) is locked in its end of stroke position by a ball (10) which lies in a radial hole (15) in the piston wall and engages the side (12) of a groove (11) formed in the cylinder end cap (2). A spring-loaded, differential locking piston (6), fitted inside the main piston blind base, has a conical surface (19) which presses the ball radially outwards into the groove. The lock is automatically released by the admission of hydraulic fluid through the cylinder inlet (7) so that the fluid pressure acts on the locking piston and forces it upwards against a spring (14) to allow the ball to move radially inwards.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE8888908198T DE3872222D1 (en) | 1987-09-26 | 1988-09-13 | LOCKABLE HYDRAULIC CYLINDER. |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19873732561 DE3732561A1 (en) | 1987-09-26 | 1987-09-26 | LOCKABLE HYDRAULIC CYLINDER |
PCT/EP1988/000835 WO1989002987A1 (en) | 1987-09-26 | 1988-09-13 | Lockable hydraulic cylinder |
DE8888908198T DE3872222D1 (en) | 1987-09-26 | 1988-09-13 | LOCKABLE HYDRAULIC CYLINDER. |
Publications (1)
Publication Number | Publication Date |
---|---|
DE3872222D1 true DE3872222D1 (en) | 1992-07-23 |
Family
ID=6337005
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19873732561 Granted DE3732561A1 (en) | 1987-09-26 | 1987-09-26 | LOCKABLE HYDRAULIC CYLINDER |
DE8888908198T Expired - Lifetime DE3872222D1 (en) | 1987-09-26 | 1988-09-13 | LOCKABLE HYDRAULIC CYLINDER. |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19873732561 Granted DE3732561A1 (en) | 1987-09-26 | 1987-09-26 | LOCKABLE HYDRAULIC CYLINDER |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0334924B1 (en) |
JP (1) | JP2701906B2 (en) |
DE (2) | DE3732561A1 (en) |
WO (1) | WO1989002987A1 (en) |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3913009C2 (en) * | 1989-04-20 | 1994-08-11 | Wolfgang Dipl Ing Niemann | Pneumatic cylinder with end position locking |
DE4107724A1 (en) * | 1991-03-11 | 1992-09-24 | Hella Kg Hueck & Co | Servo drive with safety device |
DE4107980A1 (en) * | 1991-03-13 | 1992-09-17 | Bosch Gmbh Robert | Hydraulically activated latching mechanism for piston valve - has piston rod with groove that receives ball to secure element to internal bush |
DE4215031C2 (en) * | 1992-05-07 | 2003-12-04 | Ise Gmbh | Lockable piston actuator for transporting a roll bar for motor vehicles |
JPH08193605A (en) * | 1995-01-13 | 1996-07-30 | Itec Kk | Cylinder with end lock |
DE19606724A1 (en) * | 1996-02-23 | 1997-08-28 | Schaeffler Waelzlager Kg | Device for changing the opening and closing times of gas exchange valves of an internal combustion engine |
DE19727590C1 (en) * | 1997-06-28 | 1998-07-23 | Daimler Benz Ag | Crash coupling for roll bar of motor vehicle |
DE29806525U1 (en) * | 1998-04-09 | 1999-09-02 | Kemper Gmbh Maschf | Loader wagons for the transport of crops in particular |
DE19916678C1 (en) | 1999-04-14 | 2001-02-01 | Daimler Chrysler Ag | Drive device for automobile rollover bar has piston-cylinder unit of auxiliary positioning drive uncoupled from spring-loaded piston for raising rollover bar in event of accident |
DE10323118B4 (en) * | 2003-05-22 | 2011-07-21 | Bayerische Motoren Werke Aktiengesellschaft, 80809 | Device for manually reversing a device for protecting persons in a frontal impact on a motor vehicle |
DE10343714B4 (en) * | 2003-09-20 | 2005-12-08 | Niemann, Wolfgang, Dipl.-Ing. | Lockable pneumatic cylinder |
US7784392B1 (en) | 2006-10-12 | 2010-08-31 | HDM Hydraulics, LLC | Hydraulic locking cylinder |
DE102008011731A1 (en) * | 2008-02-28 | 2009-09-03 | GM Global Technology Operations, Inc., Detroit | Pneumatic actuator |
CN108825584B (en) * | 2018-07-11 | 2020-04-07 | 永红保定铸造机械有限公司 | Piston type actuating mechanism with self-locking function |
CN109630497A (en) * | 2018-11-30 | 2019-04-16 | 湖南协力液压有限公司 | A kind of preload sealing fluid cylinder pressure |
CN113847301B (en) * | 2021-09-18 | 2024-02-02 | 湖北航天技术研究院总体设计所 | Oil cylinder capable of resisting lateral force |
CN114087396B (en) * | 2021-11-24 | 2023-06-06 | 四川凌峰航空液压机械有限公司 | Self-locking gas-liquid conversion valve |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR803805A (en) * | 1935-03-28 | 1936-10-09 | Elektronmetall Gmbh | Variable length spacer for airplanes |
FR51778E (en) * | 1941-09-12 | 1943-05-03 | Mahle Kommandit Ges | Variable length spacer for airplanes |
US2887991A (en) * | 1954-03-29 | 1959-05-26 | Haskel Engineering Associates | Fluid actuator with locking means |
US3397620A (en) * | 1966-10-06 | 1968-08-20 | Milwaukee Cylinder Corp | Fluid actuator with annular piston locking means |
US3614912A (en) * | 1969-09-29 | 1971-10-26 | Lionel Pacific Inc | Telescoping piston central lock hydraulic actuator |
JPS5321288B2 (en) * | 1972-08-11 | 1978-07-01 | ||
US4586425A (en) * | 1980-06-09 | 1986-05-06 | General Dynamics Pomona Division | Clamp locking device |
DE3143040A1 (en) * | 1981-10-30 | 1983-05-05 | Wabco Westinghouse Fahrzeugbremsen GmbH, 3000 Hannover | Device for locking a pressure medium-actuated double-acting piston-cylinder drive |
GB2128680B (en) * | 1982-10-08 | 1986-03-12 | Johnston Brothers | Hydraulic cylinder and piston |
US4635536A (en) * | 1983-09-19 | 1987-01-13 | Miller Fluid Power Corporation | Cylinder locking apparatus |
IT1177258B (en) * | 1984-11-19 | 1987-08-26 | Alfa Romeo Auto Spa | SELF-LOCKING, FLUID ACTUATOR |
-
1987
- 1987-09-26 DE DE19873732561 patent/DE3732561A1/en active Granted
-
1988
- 1988-09-13 EP EP88908198A patent/EP0334924B1/en not_active Expired - Lifetime
- 1988-09-13 JP JP63507581A patent/JP2701906B2/en not_active Expired - Fee Related
- 1988-09-13 WO PCT/EP1988/000835 patent/WO1989002987A1/en active IP Right Grant
- 1988-09-13 DE DE8888908198T patent/DE3872222D1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE3732561C2 (en) | 1992-10-08 |
EP0334924B1 (en) | 1992-06-17 |
JP2701906B2 (en) | 1998-01-21 |
JPH02501403A (en) | 1990-05-17 |
WO1989002987A1 (en) | 1989-04-06 |
DE3732561A1 (en) | 1989-04-13 |
EP0334924A1 (en) | 1989-10-04 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8364 | No opposition during term of opposition | ||
8339 | Ceased/non-payment of the annual fee |