US3253683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety circuit
Assignee: Enerpac Tool Group Corp
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Filing: 1963-11-07
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Granted: 1966-05-31
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Expires: 1983-11-07
Abstract
No abstract record available.
Inventors
- 👤 Stein Gary
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:14
CPC Classifications
F; F15; F15B; F15B20/00; F15B20/004; F16; F16H; F16H63/00; F16H63/02; F16H63/30; F16H63/3023; F16H63/3026; F16H2063/3033; F16H61/00; F16H61/38; F16H61/40; F16H61/4157
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
210 words
A SYSTEM FOR OPERATING AND BRAKING A WORK MEMBER, A BRAKE HAVING A FIRST POSITION RESTRAINING THE MOVEMENT OF SAID MEMBER AND A SECOND NON-RESTRAINING POSITION, FIRST MEANS TO NORMALLY URGE SAID BRAKE TO ITS RESTRAINING POSITION, A HYDRAULIC CYLINDER, A PISTON SLIDABLY RECEIVED IN SAID CYLINDER AND DEFINING FIRST AND SECOND EXPANSION CHAMBERS WITH SAID CYLINDER, SECOND MEANS CONNECTING SAID PISTON TO SAID BRAKE, A SOURCE OF FLUID PRESSURE, A HYDRUALIC MOTOR FOR OPERATING SAID WORK MEMBER, A FLUID CONTROL SYSTEM COMMUNICATING SAID SOURCE TO SAID MOTOR, INCLUDING A FIRST LINE DIRECTING THE FLUID FROM SAID SOURCE TO SAID MOTOR AND A SECOND LINE DIRECTING SAID FLUID FROM SAID MOTOR, A THIRD LINE COMMUNICATING THE PRESSURES IN SAID FIRST LINE WITH SAID FIRST EXPANSION CHAMBER, AND A FOURTH LINE COMMUNICATING THE PRESSURES IN SAID SECOND LINE TO SAID SECOND EXPANSION CHAMBER, A DIRECTIONAL VALVE HAVING A FIRST POSITION PERMITTING FLUID TO FLOW TO SAID MOTOR AND A NEUTRAL POSITION ROUTING SAID FLUID DIRECTLY TO SAID SECOND LINE, SAID FIRST MEANS BEING OF SUFFICIENT STRENGTH TO MAINTAIN SAID BRAKE IN SAID RESTRAINING POSITION WHEN SAID VALVE IS IN SAID NEUTRAL POSITION, AND INSUFFICIENT TO MAINTAIN SAID BRAKE IN ITS SAID RESTRAINING POSITION WHEN SAID VALVE IS IN SAID FIRST POSITION.
Claim 2
Independent Claim
210 words
A SYSTEM FOR OPERATING AND BRAKING A WORK MEMBER, A BRAKE HAVING A FIRST POSITION RESTRAINING THE MOVEMENT OF SAID MEMBER AND A SECOND NON-RESTRAINING POSITION, FIRST MEANS TO NORMALLY URGE SAID BRAKE TO ITS RESTRAINING POSITION, A HYDRAULIC CYLINDER, A PISTON SLIDABLY RECEIVED IN SAID CYLINDER AND DEFINING FIRST AND SECOND EXPANSION CHAMBERS WITH SAID CYLINDER, SECOND MEANS CONNECTING SAID PISTON TO SAID BRAKE, A SOURCE OF FLUID PRESSURE, A HYDRUALIC MOTOR FOR OPERATING SAID WORK MEMBER, A FLUID CONTROL SYSTEM COMMUNICATING SAID SOURCE TO SAID MOTOR, INCLUDING A FIRST LINE DIRECTING THE FLUID FROM SAID SOURCE TO SAID MOTOR AND A SECOND LINE DIRECTING SAID FLUID FROM SAID MOTOR, A THIRD LINE COMMUNICATING THE PRESSURES IN SAID FIRST LINE WITH SAID FIRST EXPANSION CHAMBER, AND A FOURTH LINE COMMUNICATING THE PRESSURES IN SAID SECOND LINE TO SAID SECOND EXPANSION CHAMBER, A DIRECTIONAL VALVE HAVING A FIRST POSITION PERMITTING FLUID TO FLOW TO SAID MOTOR AND A NEUTRAL POSITION ROUTING SAID FLUID DIRECTLY TO SAID SECOND LINE, SAID FIRST MEANS BEING OF SUFFICIENT STRENGTH TO MAINTAIN SAID BRAKE IN SAID RESTRAINING POSITION WHEN SAID VALVE IS IN SAID NEUTRAL POSITION, AND INSUFFICIENT TO MAINTAIN SAID BRAKE IN ITS SAID RESTRAINING POSITION WHEN SAID VALVE IS IN SAID FIRST POSITION.
References Cited (Backward Citations)
US2945572A
Cited
US3030075A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-30 | 1969-11-29 | 1970-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-30 | 1973-11-29 | 1974-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-30 | 1977-11-29 | 1978-05-31 | $7700.00 | Window Closed / Lapsed |