US3861500A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ladder leveler
Assignee: Individual
•
Filing: 1973-09-04
•
Granted: 1975-01-21
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Expires: 1993-09-04
Abstract
Abstract An integral part of a ladder which permits the ladder to be leveled to accommodate variations in terrain safely by preventing the legs from moving once the ladder is ascended.
Inventors
- 👤 John P Dempsey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:06
CPC Classifications
E; E06; E06C; E06C7/00; E06C7/42; E06C7/44
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
122 words
An automatic locking ladder leveler in combination with a ladder comprising, a metal ladder having U-shaped legs, leveler legs for mating with said U-shaped legs which slide in and out of said U-shaped legs independently, locking means for each leg for locking said leveler legs at selected positions independently of one another, a movable first rung having means slidably mating with the outside of said U-shaped legs and contacting said locking means for automatically locking said locking mechanism of each leg in response to ladder use, said movable rail locking said locking means when pressed down by a user''s body weight when first ascending said ladder whereby the leveling legs are locked in use preventing automatically the accidental movement of the ladder.
Claim 2
Dependent Claim
122 words
An automatic locking ladder leveler in combination with a ladder comprising, a metal ladder having U-shaped legs, leveler legs for mating with said U-shaped legs which slide in and out of said U-shaped legs independently, locking means for each leg for locking said leveler legs at selected positions independently of one another, a movable first rung having means slidably mating with the outside of said U-shaped legs and contacting said locking means for automatically locking said locking mechanism of each leg in response to ladder use, said movable rail locking said locking means when pressed down by a user''s body weight when first ascending said ladder whereby the leveling legs are locked in use preventing automatically the accidental movement of the ladder.
Claim 3
Dependent Claim
23 words
A ladder leveler according to claim 1 which further includes a level in said movable rung to indicate whether the ladder is level.
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) | 1978-01-20 | 1978-07-22 | 1979-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-20 | 1982-07-22 | 1983-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-20 | 1986-07-22 | 1987-01-21 | $7700.00 | Window Closed / Lapsed |