US3393004A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic lift system for wheel stretchers
Assignee: Simmons USA Corp
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Filing: 1966-10-06
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Granted: 1968-07-16
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Expires: 1986-10-06
Abstract
No abstract record available.
Inventors
- 👤 Williams Earl Leonard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:26
CPC Classifications
A; A61; A61G; A61G7/00; A61G7/002; A61G7/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
147 words
FOR USE IN A WHEELED STRETCHER HAVING A WHEELED UNDERCARRIAGE, A PATIENT-SUPPORTING PLATFORM, AND TWO LONGITUDINALLY-SPACED ADJUSTABLE-HEIGHT SUPPORTS ON SAID UNDERCARRIAGE EACH HAVING AT ITS UPPER END A PIVOTAL CONNECTION WITH THE PLATFORM ON AN AXIS EXTENDING TRANSVERSELY OF THE PLATFORM: AN IMPROVED LIFT MECHANISM WHICH PERMITS THE DIRECT PLACEMENT OF THE PATIENT-SUPPORTING PLATFORM IN ENDWISE TILT IN EITHER DIRECTION FROM ANY PREVIOUS POSITION; THE IMPROVED LIFT MECHANISM COMPRISING (1) A HYDRAULIC LIFT CLYINDER FOR ADJUSTING EACH SUPPORT, (2) A SEPARATE POSITIVE-DISPLACEMENT PUMP CONNECTED TO EACH SUCH CYLINDER, (3) MEANS FOR OPERATING THE PUMPS IN UNISON, (4) A RESERVOIR FROM WHICH THE PUMPS DRAW, (5) A RELIEF VALVE OPENING AUTOMATICALLY FROM EACH CYLINDER TO THE RESERVOIR WHEN THE CYLINDER REACHES A PREDETERMINED EXTENSION, AND (6) A SEPARATE HAND-OPERATED NORMALLY-CLOSED VALVE IN FLUID COMMUNICATION WITH EACH CYLINDER AND THE RESERVOIR TO VENT ITS ASSOCIATED CYLINDER TO THE RESERVOIR.
Claim 2
Dependent Claim
147 words
FOR USE IN A WHEELED STRETCHER HAVING A WHEELED UNDERCARRIAGE, A PATIENT-SUPPORTING PLATFORM, AND TWO LONGITUDINALLY-SPACED ADJUSTABLE-HEIGHT SUPPORTS ON SAID UNDERCARRIAGE EACH HAVING AT ITS UPPER END A PIVOTAL CONNECTION WITH THE PLATFORM ON AN AXIS EXTENDING TRANSVERSELY OF THE PLATFORM: AN IMPROVED LIFT MECHANISM WHICH PERMITS THE DIRECT PLACEMENT OF THE PATIENT-SUPPORTING PLATFORM IN ENDWISE TILT IN EITHER DIRECTION FROM ANY PREVIOUS POSITION; THE IMPROVED LIFT MECHANISM COMPRISING (1) A HYDRAULIC LIFT CLYINDER FOR ADJUSTING EACH SUPPORT, (2) A SEPARATE POSITIVE-DISPLACEMENT PUMP CONNECTED TO EACH SUCH CYLINDER, (3) MEANS FOR OPERATING THE PUMPS IN UNISON, (4) A RESERVOIR FROM WHICH THE PUMPS DRAW, (5) A RELIEF VALVE OPENING AUTOMATICALLY FROM EACH CYLINDER TO THE RESERVOIR WHEN THE CYLINDER REACHES A PREDETERMINED EXTENSION, AND (6) A SEPARATE HAND-OPERATED NORMALLY-CLOSED VALVE IN FLUID COMMUNICATION WITH EACH CYLINDER AND THE RESERVOIR TO VENT ITS ASSOCIATED CYLINDER TO THE RESERVOIR.
References Cited (Backward Citations)
US2471901A
Cited
US3265432A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-16 | 1972-01-15 | 1972-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-16 | 1976-01-15 | 1976-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-16 | 1980-01-15 | 1980-07-16 | $7700.00 | Window Closed / Lapsed |