US4679652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatically adjustable ladder support
Assignee: Individual
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Filing: 1986-03-17
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Granted: 1987-07-14
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Expires: 2006-03-17
Abstract
Abstract A ladder support has pedestals universally mounted so as to accommodate irregular ground surfaces. Each pedestal is an enlarged circular affair providing frictional engagement with the ground plane. A pair of spring-loaded jaws extend parallel to one another for receiving the lower end of the ladder, and which, due to the weight of the ladder, are levered against a resistant spring force causing the jaws to close on the end of the ladder and secure it by clamping engagement. The jaws are mounted on end plates which are, in turn, pivotally mounted onto end wall assemblies that can rotate providing a self-adjustment of the lower end of the ladder between the jaws.
Inventors
- 👤 Ramiro E. Cervantes, Sr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:39
CPC Classifications
E; E06; E06C; E06C7/00; E06C7/42; E06C7/426
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
112 words
A self-adjusting support for a ladder, comprising: first and second end plates mounted in fixed predetermined spaced apart relation exceeding the width of the lower end portion of the ladder; a pair of jaw means pivotally mounted to said first and second end plates for pivoting from a first positon with the jaw means closed on each other to a second position where the means are spaced apart a sufficient amount to enable receipt of the ladder lower end portion therebetween; spring means interconnecting the jaws means for urging them to the second position; and a pair of end wall assemblies supporting the first and second end plates on a ground plane.
Claim 2
Dependent Claim
112 words
A self-adjusting support for a ladder, comprising: first and second end plates mounted in fixed predetermined spaced apart relation exceeding the width of the lower end portion of the ladder; a pair of jaw means pivotally mounted to said first and second end plates for pivoting from a first positon with the jaw means closed on each other to a second position where the means are spaced apart a sufficient amount to enable receipt of the ladder lower end portion therebetween; spring means interconnecting the jaws means for urging them to the second position; and a pair of end wall assemblies supporting the first and second end plates on a ground plane.
Claim 3
Dependent Claim
39 words
A self-adjusting support for a ladder as in claim 1, in which the first and second end plates are pivotally mounted to said pair of end wall assemblies about an axis parallel to pivoting axis of the jaw means.
Claim 4
Dependent Claim
27 words
A self-adjusting support for a ladder as in claim 1, in which a pair of pedestals are affixed to a lower surface of each end wall assembly.
Claim 5
Dependent Claim
32 words
A self-adjusting support for a ladder as in claim 3, in which each pedestal is connected to an end wall assembly via a ball and socket providing universal adjustment of the pedestal.
Claim 6
Dependent Claim
190 words
A self-adjusting support for a ladder, comprising: first and second end plates mounted in fixed predetermined spaced apart relation exceeding the width of the lower end portion of the ladder; a pair of jaw means pivotally mounted to said first and second end plates for pivoting from a first position with the jaw means closed on each other to a second position where the jaw means are spaced apart a sufficient amount to enable receipt of the ladder lower end portion therebetween; each jaw means includes an elongated manner with a longitudinally extending clamping surface and a longitudinally extending actuating surface spaced from said clamping surface, and each said jaw means being mounted for pivoting about a longitudinal axes from the first position where the clamping surfaces are in contact and the actuating surfaces are separated to the second position where the clamping surfaces are separated and the actuating surfaces are in contact; coil spring means interconnecting the jaw means to each other for urging the jaw means toward the second position; and a pair of end wall assemblies supporting the first and second end plates on a ground plane.
Claim 7
Dependent Claim
190 words
A self-adjusting support for a ladder, comprising: first and second end plates mounted in fixed predetermined spaced apart relation exceeding the width of the lower end portion of the ladder; a pair of jaw means pivotally mounted to said first and second end plates for pivoting from a first position with the jaw means closed on each other to a second position where the jaw means are spaced apart a sufficient amount to enable receipt of the ladder lower end portion therebetween; each jaw means includes an elongated manner with a longitudinally extending clamping surface and a longitudinally extending actuating surface spaced from said clamping surface, and each said jaw means being mounted for pivoting about a longitudinal axes from the first position where the clamping surfaces are in contact and the actuating surfaces are separated to the second position where the clamping surfaces are separated and the actuating surfaces are in contact; coil spring means interconnecting the jaw means to each other for urging the jaw means toward the second position; and a pair of end wall assemblies supporting the first and second end plates on a ground plane.
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) | 1990-07-13 | 1991-01-12 | 1991-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-13 | 1995-01-12 | 1995-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-13 | 1999-01-12 | 1999-07-14 | $7700.00 | Window Closed / Lapsed |