US3263965A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual-speed, dual-load hoist arrangement
Assignee: Dominion Bridge Co Ltd
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Filing: 1964-08-31
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Granted: 1966-08-02
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Expires: 1984-08-31
Abstract
No abstract record available.
Inventors
- 👤 Robert D Mutch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:52
CPC Classifications
B; B66; B66D; B66D3/00; B66D3/04; B66D3/043; B66C; B66C13/00; B66C2700/00; B66C2700/01; B66C2700/012; B66C2700/017
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
A HOIST ARRANGEMENT INCLUDING A SUPPORT FRAME STRUCTURE, A MAIN HOOK BLOCK HAVING A PLURALITY OF ROPE SHEAVES ROTATABLY MOUNTED THEREIN, AN AUXILIARY HOOK BLOCK HAVING A ROPE EQUALIZING MEANS MOUNTED THEREIN, A PLURALITY OF FIXED ROPE SHEAVES ROTATABLY MOUNTED ON SAID SUPPORT FRAME STRUCTURE, A HOIST DRUM ROTATABLY MOUNTED ON SAID SUPPORT FRAME STRUCTURE, A HOIST ROPE OPERATIVELY ENGAGING SAID ROPE EQUALIZING MEANS AND REEVED AROUND SAID ROPE SHEAVES AND ANCHORED TO SAID HOIST DRUM, AND MEANS FOR SELECTIVELY CLAMPING SAID MAIN OR AUXILIARY HOOK BLOCKS AGAINST SAID SUPPORT FRAME STRUCTURE FOR INDEPENDENT OPERATION OF THE UNCLAMPED HOOK BLOCK.
Claim 2
Dependent Claim
100 words
A HOIST ARRANGEMENT INCLUDING A SUPPORT FRAME STRUCTURE, A MAIN HOOK BLOCK HAVING A PLURALITY OF ROPE SHEAVES ROTATABLY MOUNTED THEREIN, AN AUXILIARY HOOK BLOCK HAVING A ROPE EQUALIZING MEANS MOUNTED THEREIN, A PLURALITY OF FIXED ROPE SHEAVES ROTATABLY MOUNTED ON SAID SUPPORT FRAME STRUCTURE, A HOIST DRUM ROTATABLY MOUNTED ON SAID SUPPORT FRAME STRUCTURE, A HOIST ROPE OPERATIVELY ENGAGING SAID ROPE EQUALIZING MEANS AND REEVED AROUND SAID ROPE SHEAVES AND ANCHORED TO SAID HOIST DRUM, AND MEANS FOR SELECTIVELY CLAMPING SAID MAIN OR AUXILIARY HOOK BLOCKS AGAINST SAID SUPPORT FRAME STRUCTURE FOR INDEPENDENT OPERATION OF THE UNCLAMPED HOOK BLOCK.
References Cited (Backward Citations)
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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) | 1969-08-01 | 1970-01-31 | 1970-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-01 | 1974-01-31 | 1974-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-01 | 1978-01-31 | 1978-08-02 | $7700.00 | Window Closed / Lapsed |