Patent US3215383A successfully refreshed from Google Patents.
US3215383A
Expired / Lapsed
US
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Self-leveling support
Assignee: IND LADDER Co Inc
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Filing: 1962-06-22
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Granted: 1965-11-02
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Expires: 1982-06-22
Abstract
No abstract record available.
Inventors
- 👤 Allen C Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:37
CPC Classifications
E; E06; E06C; E06C7/00; E06C7/42; E06C7/44; F; F16; F16B; F16B7/00; F16B7/10; F16B7/14; F16B7/1409; Y; Y10; Y10T; Y10T403/00; Y10T403/70; Y10T403/7047; Y10T403/7051; Y10T403/7052; Y10T403/7054; Y10T403/7056
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
163 words
A SELF-LEVELLING SUPPORT COMPRISING: A FRAME; A PAIR OF SUBSTANTIALLY PARALLEL TUBULAR HOUSINGS MOUNTED TO SAID FRAME; A CONTINUOUS SUPPORT EXTENDING THROUGH BOTH TUBULAR HOUSINGS AND SLIDABLE RELATIVE TO EACH; AND CLUTCH MEANS WITHIN EACH HOUSING RESPONSIVE TO A PREDETERMINED LOAD APPIED TO THE SUPPORT WITHIN RESPECTIVE HOUSINGS FOR CLUTCHING SAID SUPPORT TO SAID HOUSINGS; EACH OF SAID CLUTCH MEANS FORMING A PORION OF SAID CONTINUOUS SUPPORT AND COMPRISING LONGITUDINALLY SEGMENTED CLUTCH JAWS NORMALLY SLIDABLE IN ONE OF SID TUBULAR HOUSINGS, A CYLINDRICAL ACTUATING MEMBER SLIDABLY DIPOSED WITHIN SAID SEGMENTED CLUTCH JAWS, SAID JAWS AND ACTUATING MEMBER HAVING OPPOSED AND REGISTRABLE TAPERED RECESSES FORMED IN ADJACENT SURFACES, A BALL DISPOSED IN EACH PAIR OF OPPOSED RECESSES AND MOVABLE BETWEEN THE TAPERS OF SID RECESSES FOR EXPANDING THE JAWS INTO CONTACT WITH THE INTERIOR OF THE TUBULAR HOUSING, AND SPRING MEANS FOR NORMALLY MAINTAINING AN AXIAL THRUST AGAINST SAID ACTUATING MEMBER TO FREE THE JAWS FROM CONTACT WITH THE INTERIOR OF SAID TUBULAR HOUSING.
Claim 2
Dependent Claim
163 words
A SELF-LEVELLING SUPPORT COMPRISING: A FRAME; A PAIR OF SUBSTANTIALLY PARALLEL TUBULAR HOUSINGS MOUNTED TO SAID FRAME; A CONTINUOUS SUPPORT EXTENDING THROUGH BOTH TUBULAR HOUSINGS AND SLIDABLE RELATIVE TO EACH; AND CLUTCH MEANS WITHIN EACH HOUSING RESPONSIVE TO A PREDETERMINED LOAD APPIED TO THE SUPPORT WITHIN RESPECTIVE HOUSINGS FOR CLUTCHING SAID SUPPORT TO SAID HOUSINGS; EACH OF SAID CLUTCH MEANS FORMING A PORION OF SAID CONTINUOUS SUPPORT AND COMPRISING LONGITUDINALLY SEGMENTED CLUTCH JAWS NORMALLY SLIDABLE IN ONE OF SID TUBULAR HOUSINGS, A CYLINDRICAL ACTUATING MEMBER SLIDABLY DIPOSED WITHIN SAID SEGMENTED CLUTCH JAWS, SAID JAWS AND ACTUATING MEMBER HAVING OPPOSED AND REGISTRABLE TAPERED RECESSES FORMED IN ADJACENT SURFACES, A BALL DISPOSED IN EACH PAIR OF OPPOSED RECESSES AND MOVABLE BETWEEN THE TAPERS OF SID RECESSES FOR EXPANDING THE JAWS INTO CONTACT WITH THE INTERIOR OF THE TUBULAR HOUSING, AND SPRING MEANS FOR NORMALLY MAINTAINING AN AXIAL THRUST AGAINST SAID ACTUATING MEMBER TO FREE THE JAWS FROM CONTACT WITH THE INTERIOR OF SAID TUBULAR HOUSING.
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) | 1968-11-01 | 1969-05-03 | 1969-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-01 | 1973-05-03 | 1973-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-01 | 1977-05-03 | 1977-11-02 | $7700.00 | Window Closed / Lapsed |