Patent US3882966A successfully refreshed from Google Patents.
US3882966A
Expired / Lapsed
US
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Ladder adapter device
Assignee: MIGLIAVACCA GIOSUE
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Filing: 1974-09-13
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Granted: 1975-05-13
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Expires: 1994-09-13
Abstract
Abstract A device for adapting a ladder to be supported on uneven ground comprises a tubular guide rigidly connected to an upright of the ladder, a hollow slide received in the guide and bearing a toothed rack and having a longitudinal slot opposite the rack, and a pawl borne by the tubular guide and adapted to engage a tooth of the rack to support the slide at a chosen position in the guide.
Inventors
- 👤 Osvaldo Fasano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:43
CPC Classifications
E; E06; E06C; E06C7/00; E06C7/42; E06C7/44
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
104 words
An adapter device for a ladder having two uprights and a plurality of rungs, the device comprising: a tubular guide adapted to be rigidly connected to an upright of the ladder; a pawl pivotally mounted on the guide; a hollow slide received in the guide and having a longitudinal slot through which the pawl can penetrate the slide; a rack rigidly connected to an inner surface of the hollow slide and bearing teeth opposite the slot; the pawl being operable to engage a tooth of the rack to resist forces tending to move the guide with respect to the slide in a predetermined direction.
Claim 2
Dependent Claim
104 words
An adapter device for a ladder having two uprights and a plurality of rungs, the device comprising: a tubular guide adapted to be rigidly connected to an upright of the ladder; a pawl pivotally mounted on the guide; a hollow slide received in the guide and having a longitudinal slot through which the pawl can penetrate the slide; a rack rigidly connected to an inner surface of the hollow slide and bearing teeth opposite the slot; the pawl being operable to engage a tooth of the rack to resist forces tending to move the guide with respect to the slide in a predetermined direction.
Claim 3
Dependent Claim
22 words
The device of claim 1, wherein the teeth of the rack have sides at 45* to the longitudinal axis of the rack.
Claim 4
Dependent Claim
29 words
The device of claim 1, wherein the tubular guide is apertured and the pawl extends through the aperture and is pivotally mounted on an outer surface of the guide.
Claim 5
Dependent Claim
20 words
The device of claim 3, further comprising an operating lever for the pawl, the lever being integral with the pawl.
Claim 6
Dependent Claim
31 words
The device of claim 4, wherein the operating lever is adapted to lie along the outer surface of the guide while the pawl engages one of the teeth of the rack.
Claim 7
Dependent Claim
30 words
The device of claim 4, further comprising spring means connected to the pawl to urge the pawl in a position where it engages one of the teeth of the rack.
Claim 8
Dependent Claim
10 words
A ladder fitted with a device according to claim 1.
Claim 9
Dependent Claim
68 words
The ladder of claim 7, wherein one of thE uprights is shorter than the other, and the device is fitted to the end of the shorter upright so that the longitudinal axes of the shorter upright and of the device coincide, the device being so proportioned that the slide of the device, when it is in fully retracted position, allows the ladder to be supported on even ground.
Claim 10
Dependent Claim
28 words
The ladder of claim 7, wherein the uprights are of equal length, and the device is strapped to an end of one upright by means of removable means.
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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) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |