Patent US3267818A successfully refreshed from Google Patents.
US3267818A
Expired / Lapsed
US
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Hydraulic jack
Assignee: Lear Siegler Inc
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Filing: 1964-03-09
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Granted: 1966-08-23
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Expires: 1984-03-09
Abstract
No abstract record available.
Inventors
- 👤 Henry B Chambers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:41
CPC Classifications
B; B66; B66F; B66F3/00; B66F3/24; B66F3/25; B66F3/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
145 words
IN A HYDRAULIC JACK INCLUDING A RAM MOUNTED ON A PISTON THAT IS SLIDABLY DISPOSED IN A CYLINDER AND OPERATED BY A PRESSURIZED FLUID SUBJECTED ON ONE SIDE OF THE PISTON TO MOVE THE RAM IN A FIRST DIRECTION, THE IMPROVEMENT COMPRISING: THE RAM HAS A CONTINUOUS HELICAL GROOVE FORMED THEREON, A RING ROTATABLY MOUNTED ON THE RAM ENGAGES THE RAM GROOVE, THE RING IS RESTRAINED FROM MOVING WITH THE RAM BUT MAY VREELY ROTATE THREON, THE RING INCLUDES A PORTION WHICH ABUTS THE CYLINDER IN SUPPORTING FASHION, A LOCK DISPOSED ADJACENT TO THE RING, A MEANS FOR URGING THE LOCK OUT OF ENGAGEMENT WITH THE RING INCLUDING A SECOND CYLINDER DISPOSED IN TELESCOPING RELATIONSHIP WITH THE RING, A FLUID CONDUIT COMMUNICATING WITH THE SECOND CYLINDER AND THE PRESSURIZED FLUID ACTING ON THE PISTON, AND MEANS FOR URGING THE LOCK INTO ENGAGEMENT WITH THE RING.
Claim 2
Dependent Claim
145 words
IN A HYDRAULIC JACK INCLUDING A RAM MOUNTED ON A PISTON THAT IS SLIDABLY DISPOSED IN A CYLINDER AND OPERATED BY A PRESSURIZED FLUID SUBJECTED ON ONE SIDE OF THE PISTON TO MOVE THE RAM IN A FIRST DIRECTION, THE IMPROVEMENT COMPRISING: THE RAM HAS A CONTINUOUS HELICAL GROOVE FORMED THEREON, A RING ROTATABLY MOUNTED ON THE RAM ENGAGES THE RAM GROOVE, THE RING IS RESTRAINED FROM MOVING WITH THE RAM BUT MAY VREELY ROTATE THREON, THE RING INCLUDES A PORTION WHICH ABUTS THE CYLINDER IN SUPPORTING FASHION, A LOCK DISPOSED ADJACENT TO THE RING, A MEANS FOR URGING THE LOCK OUT OF ENGAGEMENT WITH THE RING INCLUDING A SECOND CYLINDER DISPOSED IN TELESCOPING RELATIONSHIP WITH THE RING, A FLUID CONDUIT COMMUNICATING WITH THE SECOND CYLINDER AND THE PRESSURIZED FLUID ACTING ON THE PISTON, AND MEANS FOR URGING THE LOCK INTO ENGAGEMENT WITH THE RING.
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) | 1969-08-22 | 1970-02-21 | 1970-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-22 | 1974-02-21 | 1974-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-22 | 1978-02-21 | 1978-08-23 | $7700.00 | Window Closed / Lapsed |