Patent US3554321A successfully refreshed from Google Patents.
US3554321A
Expired / Lapsed
US
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Extensible foot for ladders
Assignee: Individual
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Filing: 1969-12-17
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Granted: 1971-01-12
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Expires: 1989-12-17
Abstract
Abstract An extensible foot for ladders for adjustment of the ladder to uneven and slanting terrain, comprising a channel fixed on at least one of the sidepieces of the ladder, by a bolt passing through one of the crosspieces thereof, and a lockable sliding channel in the fixed channel.
Inventors
- 👤 Victor S Stedman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:20
CPC Classifications
E; E06; E06C; E06C7/00; E06C7/42; E06C7/44
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
157 words
An extensible foot for ladders of the type having a pair of sidepieces with connecting crosspieces, and comprising a channelshaped member, means substantially permanently connecting the same to one of the sidepieces of the ladder adjacent the lower end thereof, said channel comprising a bottom and spaced side flanges at the edges of the bottom, and inwardly directed lips at the free end edges of said flanges; and a slidable channel mounted in said first-named channel, said slidable channel including edge flanges which nest in the first-named channel and slidably impinge upon the inside surfaces of the lips on the flanges thereof, and means on said slidable channel providing for exerting a force on the bottom of the permanent channel thereby tending to move the slidable channel in the direction away therefrom, clamping the edges of the flanges of the slidable channel at the under side surfaces of the lips on the flanges of the permanent channel.
Claim 2
Dependent Claim
157 words
An extensible foot for ladders of the type having a pair of sidepieces with connecting crosspieces, and comprising a channelshaped member, means substantially permanently connecting the same to one of the sidepieces of the ladder adjacent the lower end thereof, said channel comprising a bottom and spaced side flanges at the edges of the bottom, and inwardly directed lips at the free end edges of said flanges; and a slidable channel mounted in said first-named channel, said slidable channel including edge flanges which nest in the first-named channel and slidably impinge upon the inside surfaces of the lips on the flanges thereof, and means on said slidable channel providing for exerting a force on the bottom of the permanent channel thereby tending to move the slidable channel in the direction away therefrom, clamping the edges of the flanges of the slidable channel at the under side surfaces of the lips on the flanges of the permanent channel.
Claim 3
Dependent Claim
40 words
The extensible foot for ladders as recited in claim 1 including means on the permanent channel for engagement with the extreme lower end portion of the sidepiece to which it is attached and locating the permanent channel with respect thereto.
Claim 4
Dependent Claim
60 words
The extensible foot for ladders as recited in claim 1 wherein the means for securing the permanent channel to the ladder comprises a two-part bolt, the parts thereof being adjustably connected together and each part including a head, one of the heads being adapted to bear on said permanent channel bottom and hold it against the sidepiece of the ladder.
Claim 5
Dependent Claim
81 words
The extensible foot for ladders as recited in claim 1 wherein the means for securing the permanent channel to the ladder comprises a two-part bolt, the parts thereof being adjustably connected together and each part including a hEad, one of the heads being adapted to bear on said permanent channel bottom and hold it against the sidepiece of the ladder, said two-part bolt extending from one sidepiece of the ladder to the other sidepiece of the ladder and being engaged therewith.
Claim 6
Dependent Claim
29 words
The extensible foot for ladders as recited in claim 1 wherein the ladder is of metal and the crosspiece receives the means securing the permanent channel to the ladder.
Claim 7
Dependent Claim
22 words
The extensible foot for ladders as recited in claim 1 wherein the ladder is of metal and the crosspiece comprises a bolt.
Claim 8
Dependent Claim
34 words
The extensible foot for ladders as recited in claim 1 wherein the ladder is of metal and the crosspiece comprises a bolt, said bolt extending across the ladder and being concealed by the crosspiece.
References Cited (Backward Citations)
US2360640A
Cited
US2599117A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |