Patent US3266382A successfully refreshed from Google Patents.
US3266382A
Expired / Lapsed
US
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Hydraulic elevator control systems
Assignee: Individual
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Filing: 1964-09-24
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Granted: 1966-08-16
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Expires: 1984-09-24
Abstract
No abstract record available.
Inventors
- 👤 Robert F Loughridge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:27
CPC Classifications
B; B66; B66B; B66B1/00; B66B1/24; B66B1/34; B66B1/36; B66B1/40; B66B1/405; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2544; Y10T137/2557; Y10T137/2559; Y10T137/2564; Y10T137/2567
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
187 words
IN A HYDRAULIC ELEVATOR UP-CONTROL SYSTEM OF THE TYPE HAVING A PRIMARY CONDUIT THAT CONNECTS A PUMP TO A HYDRAULIC JACK, AND A BY-PASS CONDUIT WHICH COMMUNICATES WITH SAID PRIMARY CONDUIT AND WHICH INCLUDES BYPASS VALVE MEANS FOR DIVERTING A PORTION OF THE FLOW OF FLUID FROM SAID PUMP AWAY FROM SAID HYDRAULIC JACK AS A MEANS OF CONTROLLING THE SPEED OF THE ELEVATOR, THE IMPROVEMENT COMPRISING: (A) A FLOW RESPONSIVE VALVE INTERPOSED IN SAID PRIMARY CONDUIT AT A REGION INTERMEDIATE THE HYDRAULIC JACK AND THE JUNCTION OF THE PRIMARY AND BYPASS CONDUITS SAID FLOW RESPONSIVE VALVE HAVING A MOVABLE ELEMENT THE POSITION OF WHICH IS DIRECTLY CONTROLLED BY THE FLOW RATE OF THE FLUID PASSING THROUGH SAID VALVE; (B) A PILOT CONDUIT COMMUNICATING BETWEEN SAID FLOW RESPONSIVE VALVE AND SAID BY-PASS VALVE MEANS; AND (C) A PILOT VALVE ATTACHED TO SAID FLOW RESPONSIVE VALVE AND HAVING A CONTROL ARM THAT IS BIASED TO URGE SAID PILOT VALVE TOWARD ITS CLOSED POSITION, SAID ARM EXTENDING INTO ENGAGEMENT WITH THE MOVABLE ELEMENT OF SAID FLOW RESPONSIVE VALVE TO ACTUATE THE PILOT VALVE TO CONTROL SAID BY-PASS VALVE MEANS.
Claim 2
Dependent Claim
187 words
IN A HYDRAULIC ELEVATOR UP-CONTROL SYSTEM OF THE TYPE HAVING A PRIMARY CONDUIT THAT CONNECTS A PUMP TO A HYDRAULIC JACK, AND A BY-PASS CONDUIT WHICH COMMUNICATES WITH SAID PRIMARY CONDUIT AND WHICH INCLUDES BYPASS VALVE MEANS FOR DIVERTING A PORTION OF THE FLOW OF FLUID FROM SAID PUMP AWAY FROM SAID HYDRAULIC JACK AS A MEANS OF CONTROLLING THE SPEED OF THE ELEVATOR, THE IMPROVEMENT COMPRISING: (A) A FLOW RESPONSIVE VALVE INTERPOSED IN SAID PRIMARY CONDUIT AT A REGION INTERMEDIATE THE HYDRAULIC JACK AND THE JUNCTION OF THE PRIMARY AND BYPASS CONDUITS SAID FLOW RESPONSIVE VALVE HAVING A MOVABLE ELEMENT THE POSITION OF WHICH IS DIRECTLY CONTROLLED BY THE FLOW RATE OF THE FLUID PASSING THROUGH SAID VALVE; (B) A PILOT CONDUIT COMMUNICATING BETWEEN SAID FLOW RESPONSIVE VALVE AND SAID BY-PASS VALVE MEANS; AND (C) A PILOT VALVE ATTACHED TO SAID FLOW RESPONSIVE VALVE AND HAVING A CONTROL ARM THAT IS BIASED TO URGE SAID PILOT VALVE TOWARD ITS CLOSED POSITION, SAID ARM EXTENDING INTO ENGAGEMENT WITH THE MOVABLE ELEMENT OF SAID FLOW RESPONSIVE VALVE TO ACTUATE THE PILOT VALVE TO CONTROL SAID BY-PASS VALVE 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) | 1969-08-15 | 1970-02-14 | 1970-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-15 | 1974-02-14 | 1974-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-15 | 1978-02-14 | 1978-08-16 | $7700.00 | Window Closed / Lapsed |