Patent US3074508A successfully refreshed from Google Patents.
US3074508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ladder hoist
Assignee: Individual
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Filing: 1960-10-28
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Granted: 1963-01-22
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Expires: 1980-10-28
Abstract
No abstract record available.
Inventors
- 👤 William F Book
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:05
CPC Classifications
E; E06; E06C; E06C7/00; E06C7/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
164 words
IN COMBINATION, A PAIR OF LADDERS HAVING VERTICALLY SPACED RUNGS AND SIDE RAILS, A HOIST COMPRISING A PAIR OF BRACKETS HAVING UPPER AND LOWER MEMBERS SUPPORTABLY ENGAGED ON VERTICALLY SPACED RUNGS OF THE LADDERS, A HOIST SHEAVE CARRIER EXTENDING BETWEEN THE BRACKETS AND PIVOTED ON A HORIZONTAL AXIS ON THE BRACKETS, LOCKING MEANS FOR HOLDING THE CARRIER IN SELECTED ROTATED RELATIONSHIP TO THE BRACKETS, THE PIVOT AXIS OF THE CARRIER BEING DISPOSED UPWARDLY AND OUTWARDLY RELATIVE TO SAID UPPER AND LOWER MEMBERS, SAID CARRIER BEING U-SHAPED AND HAVING A HORIZONTAL BIGHT PORTION HAVING HOIST SHEAVE SUPPORTING MEANS THEREON, AND LEGS HAVING FREE ENDS, HORIZONTAL AXIS LOCKING PLATES ON SAID FREE ENDS, SAID BRACKETS HAVING HORIZONTAL AXIS LOCKING PLATES THEREON, PIVOT BOLTS EXTENDING THROUGH THE LOCKING PLATES OF THE CARRIER LEGS AND OF THE BRACKETS, SAID BOLTS BEING FREELY ROTATABLE IN LOCKING PLATES AND THREADED IN OTHER LOCKING PLATES, CIRCUMFERENTIAL HOLES IN LOCKING PLATES, AND LOCKING PINS ON OTHER LOCKING PLATES REMOVABLY ENGAGED IN HOLES.
Claim 2
Dependent Claim
164 words
IN COMBINATION, A PAIR OF LADDERS HAVING VERTICALLY SPACED RUNGS AND SIDE RAILS, A HOIST COMPRISING A PAIR OF BRACKETS HAVING UPPER AND LOWER MEMBERS SUPPORTABLY ENGAGED ON VERTICALLY SPACED RUNGS OF THE LADDERS, A HOIST SHEAVE CARRIER EXTENDING BETWEEN THE BRACKETS AND PIVOTED ON A HORIZONTAL AXIS ON THE BRACKETS, LOCKING MEANS FOR HOLDING THE CARRIER IN SELECTED ROTATED RELATIONSHIP TO THE BRACKETS, THE PIVOT AXIS OF THE CARRIER BEING DISPOSED UPWARDLY AND OUTWARDLY RELATIVE TO SAID UPPER AND LOWER MEMBERS, SAID CARRIER BEING U-SHAPED AND HAVING A HORIZONTAL BIGHT PORTION HAVING HOIST SHEAVE SUPPORTING MEANS THEREON, AND LEGS HAVING FREE ENDS, HORIZONTAL AXIS LOCKING PLATES ON SAID FREE ENDS, SAID BRACKETS HAVING HORIZONTAL AXIS LOCKING PLATES THEREON, PIVOT BOLTS EXTENDING THROUGH THE LOCKING PLATES OF THE CARRIER LEGS AND OF THE BRACKETS, SAID BOLTS BEING FREELY ROTATABLE IN LOCKING PLATES AND THREADED IN OTHER LOCKING PLATES, CIRCUMFERENTIAL HOLES IN LOCKING PLATES, AND LOCKING PINS ON OTHER LOCKING PLATES REMOVABLY ENGAGED IN HOLES.
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) | 1966-01-21 | 1966-07-23 | 1967-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-21 | 1970-07-23 | 1971-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-21 | 1974-07-23 | 1975-01-22 | $7700.00 | Window Closed / Lapsed |