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Patent US4183423A successfully refreshed from Google Patents.
US4183423A
Expired / Lapsed
US
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Ladder hoist
Assignee: Individual
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Filing: 1977-09-21
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Granted: 1980-01-15
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Expires: 1997-09-21
Abstract
Abstract A cart bolted to a short bottom section of a ladder carries a winch. A cable on the winch runs over a pulley on a short top section of the ladder and is connected to a carriage having wheels running in channel-like side members of the ladder. The carriage has an adjustable, folding platform and a back which pivots to a horizontal position when the carriage reaches the top of the ladder. A bottom pushbutton control and a top pushbutton control are provided.
Inventors
- 👤 James P. Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:11
CPC Classifications
E; E06; E06C; E06C7/00; E06C7/12; B; B66; B66B; B66B9/00; B66B9/16
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
59 words
In a ladder hoist, a sloping, ladder having tracks, a frame, rollers in the tracks and supporting the frame in a position substantially parallel to the ladder, a platform pivotally connected to the top of the frame, adjustable brace means connected to the frame and the platform, and a back plate pivotally connected to the top of the frame.
Claim 2
Dependent Claim
59 words
In a ladder hoist, a sloping, ladder having tracks, a frame, rollers in the tracks and supporting the frame in a position substantially parallel to the ladder, a platform pivotally connected to the top of the frame, adjustable brace means connected to the frame and the platform, and a back plate pivotally connected to the top of the frame.
Claim 3
Dependent Claim
54 words
a ladder, a cart attachable to and detachable from the ladder, winch means mounted on the cart, and carriage means movable by the winch means up the ladder, the carriage means including frame means lying along the ladder, a support platform hinged to the frame means and a back plate hinged to the platform.
Claim 4
Dependent Claim
54 words
a ladder, a cart attachable to and detachable from the ladder, winch means mounted on the cart, and carriage means movable by the winch means up the ladder, the carriage means including frame means lying along the ladder, a support platform hinged to the frame means and a back plate hinged to the platform.
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) | 1983-01-14 | 1983-07-16 | 1984-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-14 | 1987-07-16 | 1988-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-14 | 1991-07-16 | 1992-01-15 | $7700.00 | Window Closed / Lapsed |