US3738229A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulically operated cylinder-piston unit
Assignee: Haldex AB
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Filing: 1971-11-10
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Granted: 1973-06-12
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Expires: 1991-11-10
Abstract
Abstract A hydraulically-actuated cylinder-piston unit providing a forward driving force is disclosed which can be releasably locked against a return action when the hydraulic drive terminates. The release mechanism is triggered by a small force and operates independently of the force applied by the piston drive. This is accomplished by a non-locking rotating nut on the piston rod provided with a one-way clutch and a spring loaded dog clutch independent of the drive train operated hydraulically as a release trigger.
Inventors
- 👤 U Kraft
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:06
CPC Classifications
B; B60; B60T; B60T17/00; B60T17/08; B60T17/16; B60T17/081
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
181 words
A drive unit for moving a piston in a forward direction and returning it in the opposite return direction, including drive force means providing a movement force in said forward direction, a force translating member coupled between said means and said piston to move said piston forward with said movement force, and means providing a return force to move said piston and said translating means in said opposite direction, including means on said translating member for releasably locking said piston in the forward direction, comprising in combination, a movable rod with screw threads of non-self locking pitch, a nut rotatable thereon, restraining means including a one way clutch coupled to permit the nut to rotate only in a direction permitting a forward movement of said translating member, a movable clutch coupled to release said restraining means to permit the nut to rotate in the direction permitting movement of said translating member in the return direction, and trigger means for moving said clutch selectively to release said restraining means and permit return of said piston by said means providing a return force.
Claim 2
Dependent Claim
181 words
A drive unit for moving a piston in a forward direction and returning it in the opposite return direction, including drive force means providing a movement force in said forward direction, a force translating member coupled between said means and said piston to move said piston forward with said movement force, and means providing a return force to move said piston and said translating means in said opposite direction, including means on said translating member for releasably locking said piston in the forward direction, comprising in combination, a movable rod with screw threads of non-self locking pitch, a nut rotatable thereon, restraining means including a one way clutch coupled to permit the nut to rotate only in a direction permitting a forward movement of said translating member, a movable clutch coupled to release said restraining means to permit the nut to rotate in the direction permitting movement of said translating member in the return direction, and trigger means for moving said clutch selectively to release said restraining means and permit return of said piston by said means providing a return force.
Claim 3
Dependent Claim
16 words
A drive unit as defined in claim 1 wherein said drive force means comprises hydraulic means.
Claim 4
Dependent Claim
16 words
A drive unit as defined in claim 1 wherein said return force means comprises a spring.
Claim 5
Dependent Claim
25 words
A drive unit as defined in claim 1 wherein said movable clutch comprises a spring loaded clutch, and said triGger means comprises a hydraulic piston.
Claim 6
Dependent Claim
33 words
A drive unit as defined in claim 1 wherein the one way clutch and the movable clutch have intermeshing teeth, which are disengaged by movement of said movable clutch by said trigger means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |