US3270510A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mine roof and like supports
Assignee: Gullick Ltd
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Filing: 1963-11-12
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Granted: 1966-09-06
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Expires: 1983-11-12
Abstract
No abstract record available.
Inventors
- 👤 Donald T Walsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:48
CPC Classifications
E; E21; E21D; E21D23/00; E21D23/0052; E21D23/0004; E21D23/0017; E21D23/0021
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
152 words
A MINE ROOF SUPPORT COMPRISING A REAR UNIT AND A FORWARD UNIT, EACH OF SAID UNITS COMPRISING A BASE, HYDRAULICALLY EXTENSIBLE PROP MEANS ON SAID BASE AND A ROOF-ENGAGING MEMBER MOUNTED ON THE UPPER PART OF SAID PROP MEANS, THE ROOF-ENGAGING MEMBER OF THE FORWARD UNIT HAVING A FORWARDLY EXTENDING EXTENSION MEMBER AND A PIVOTAL SEATING ON ITS PROP MEANS WHEREBY IT CAN ADJUST ITSELF TO ROOF IRREGULARITIES, AT LEAST ONE FLEXIBLE ELASTIC MEMBER POSITIONED BETWEEN OPPOSED ENDS OF THE ROOFENGAGING MEMBERS OF THE REAR AND FORWARD UNITS, MEANS AT ONE END OF SAID FLEXIBLE ELASTIC MEMBER HINGEDLY CONNECTING IT TO ONE OF SAID ROOF-ENGAGING MEMBERS SO THAT IT CAN PIVOT TOWARDS AND AWAY FROM THE ROOF AND MEANS AT THE OTHER END OF SAID FLEXIBLE ELASTIC MEMBER RIGIDLY CONNECTING IT TO THE OTHER OF SAID ROOF-ENGAGING MEMBERS WHEREBY SAID SELF-ADJUSTMENT OF THE ROOF-ENGAGING MEMBER OF THE FORWARD UNIT IS ELASTICALLY CONTROLLED.
Claim 2
Dependent Claim
152 words
A MINE ROOF SUPPORT COMPRISING A REAR UNIT AND A FORWARD UNIT, EACH OF SAID UNITS COMPRISING A BASE, HYDRAULICALLY EXTENSIBLE PROP MEANS ON SAID BASE AND A ROOF-ENGAGING MEMBER MOUNTED ON THE UPPER PART OF SAID PROP MEANS, THE ROOF-ENGAGING MEMBER OF THE FORWARD UNIT HAVING A FORWARDLY EXTENDING EXTENSION MEMBER AND A PIVOTAL SEATING ON ITS PROP MEANS WHEREBY IT CAN ADJUST ITSELF TO ROOF IRREGULARITIES, AT LEAST ONE FLEXIBLE ELASTIC MEMBER POSITIONED BETWEEN OPPOSED ENDS OF THE ROOFENGAGING MEMBERS OF THE REAR AND FORWARD UNITS, MEANS AT ONE END OF SAID FLEXIBLE ELASTIC MEMBER HINGEDLY CONNECTING IT TO ONE OF SAID ROOF-ENGAGING MEMBERS SO THAT IT CAN PIVOT TOWARDS AND AWAY FROM THE ROOF AND MEANS AT THE OTHER END OF SAID FLEXIBLE ELASTIC MEMBER RIGIDLY CONNECTING IT TO THE OTHER OF SAID ROOF-ENGAGING MEMBERS WHEREBY SAID SELF-ADJUSTMENT OF THE ROOF-ENGAGING MEMBER OF THE FORWARD UNIT IS ELASTICALLY CONTROLLED.
References Cited (Backward Citations)
GB876797A
Cited
GB885645A
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GB845302A
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US2910282A
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DE1112480B
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DE1119803B
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US3097829A
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US3120105A
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FR1337706A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-05 | 1970-03-07 | 1970-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-05 | 1974-03-07 | 1974-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-05 | 1978-03-07 | 1978-09-06 | $7700.00 | Window Closed / Lapsed |