US3937298A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Levelling attachment for ladders
Assignee: Individual
•
Filing: 1975-04-16
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Granted: 1976-02-10
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Expires: 1995-04-16
Abstract
Abstract An attachment for extension ladders which accommodates to uneven terrain and supports the ladder against leaning or tipping laterally. The attachment includes a pair of open ended sockets mounted at opposite ends of a transverse member which is attached to the rails of an extension ladder. Two independently adjustable legs are slidably received, each in a respective socket outboard of the rails. A latching element associated with each socket locks each leg in a position of adjustment.
Inventors
- 👤 Mathew Hurwitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:05
CPC Classifications
E; E06; E06C; E06C7/00; E06C7/42; E06C7/44; E06C7/46
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
218 words
An apparatus for supporting a ladder on an irregularly contoured surface comprising, a transverse member having end portions extending outboard of the side rails of said ladder, means for securing said transverse member to said side rails, a pair of legs, each being generally rectangular in cross section, a knuckle mounted on each end of said transverse member, each knuckle including an open ended socket portion generally rectangular in cross section and shaped to slidably receive one of said legs, each knuckle including a pair of channel ears integral with a socket portion and disposed in confronting relation to each other so as to embrace one end of said transverse member, each of said channel ears extending vertically beyond at least one horizontal edge of said socket portion with the extending portion of the channel ear providing a pair of vertical abutment edges in spaced confronting relation to a respective leg, latching means associated with each knuckle, each latching means including a camming bight portion disposed between a pair of vertical abutment edges and a respective leg, said bight portion being manually rotatable to engage said abutment edges and a respective leg so as to cant said leg within said socket portion to frictionally bind said leg within said socket portion in an infinite number of adjusted positions.
Claim 2
Independent Claim
218 words
An apparatus for supporting a ladder on an irregularly contoured surface comprising, a transverse member having end portions extending outboard of the side rails of said ladder, means for securing said transverse member to said side rails, a pair of legs, each being generally rectangular in cross section, a knuckle mounted on each end of said transverse member, each knuckle including an open ended socket portion generally rectangular in cross section and shaped to slidably receive one of said legs, each knuckle including a pair of channel ears integral with a socket portion and disposed in confronting relation to each other so as to embrace one end of said transverse member, each of said channel ears extending vertically beyond at least one horizontal edge of said socket portion with the extending portion of the channel ear providing a pair of vertical abutment edges in spaced confronting relation to a respective leg, latching means associated with each knuckle, each latching means including a camming bight portion disposed between a pair of vertical abutment edges and a respective leg, said bight portion being manually rotatable to engage said abutment edges and a respective leg so as to cant said leg within said socket portion to frictionally bind said leg within said socket portion in an infinite number of adjusted positions.
Claim 3
Dependent Claim
20 words
The invention as defined in claim 1 including means for retaining said latching means in assembled relation with said knuckle.
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) | 1979-02-09 | 1979-08-11 | 1980-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-09 | 1983-08-11 | 1984-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-09 | 1987-08-11 | 1988-02-10 | $7700.00 | Window Closed / Lapsed |