Patent US4147231A successfully refreshed from Google Patents.
US4147231A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ladder stabilizing device
Assignee: Individual
•
Filing: 1977-09-26
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Granted: 1979-04-03
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Expires: 1997-09-26
Abstract
Abstract A stablizing device to be connected on the outer sides of the side pieces of a ladder has a lower leg pivoted on a lower part of the side piece and pivoted at its upper end to an upper leg part which has a locking member for releasable locking on the side piece. By adjustment of the upper leg part, the leg parts can be braced against the ground or against a vertical wall surface. This device leaves the rungs of the ladder unobstructed and the upper leg part may be freely slidingly connected on the side piece so that the knees can readily be adjusted independently to allow the ladder to be stabilized on uneven ground. There is disclosed an arrangement in which a lever on the upper leg part engages a toothed rack on the side piece and lifts the ladder bodily upwards a small distance as the lever is pressed inward to the side of the ladder. This lifting action transfers the weight of the ladder from the foot of the ladder to the outlying feet of the upper leg parts so that a wide and stable supporting base is provided.
Inventors
- 👤 Douglas A. Chantler
- 👤 Ross W. Coleman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:22
CPC Classifications
E; E06; E06C; E06C7/00; E06C7/42; E06C7/423
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
112 words
Stabilizing means for connection on the outer side of each side piece of a ladder comprising a lower leg part adapted to be pivotally connected on the side piece, an upper leg part pivotally connected to the lower leg part, a reaction member for connection on the side piece above the lower leg part, rotatable means connected to the upper leg part and having an axis of rotation, said rotatable means rotating in engagement with the reaction member to shift the reaction member upwardly relative to the axis of rotation and the upper leg part, and releasable retaining means for retaining the rotatable means in fixed position relative to the reaction member.
Claim 2
Dependent Claim
112 words
Stabilizing means for connection on the outer side of each side piece of a ladder comprising a lower leg part adapted to be pivotally connected on the side piece, an upper leg part pivotally connected to the lower leg part, a reaction member for connection on the side piece above the lower leg part, rotatable means connected to the upper leg part and having an axis of rotation, said rotatable means rotating in engagement with the reaction member to shift the reaction member upwardly relative to the axis of rotation and the upper leg part, and releasable retaining means for retaining the rotatable means in fixed position relative to the reaction member.
Claim 3
Dependent Claim
103 words
Stabilizing means for connection on the outer side of each side piece of a ladder comprising a lower leg part adapted to be pivotally connected on the side piece, an upper leg part pivotally connected to the lower leg part, a reaction member for connection on the side piece above the lower leg part, lever means pivotally connected to the upper leg part and moving in engagement with the reaction member to shift the reaction member upwardly relative to the lever means and upper leg part, and releasable retaining means for retaining the lever means in fixed position relative to the reaction member.
Claim 4
Dependent Claim
103 words
Stabilizing means for connection on the outer side of each side piece of a ladder comprising a lower leg part adapted to be pivotally connected on the side piece, an upper leg part pivotally connected to the lower leg part, a reaction member for connection on the side piece above the lower leg part, lever means pivotally connected to the upper leg part and moving in engagement with the reaction member to shift the reaction member upwardly relative to the lever means and upper leg part, and releasable retaining means for retaining the lever means in fixed position relative to the reaction member.
Claim 5
Dependent Claim
75 words
Stabilizing means according to claim 2 wherein said reaction means comprises a toothed rack adapted to be connected longitudinally on the side piece and the lever means comprise a pivotal dog for engagement with the rack, the dog reacting against a tooth of the rack and urging the rack upwardly relative as the dog is pivoted into engagement with the rack, and wherein said releasable retaining means retain said dog in engagement with said tooth.
Claim 6
Dependent Claim
41 words
Stabilizing means according to claim 3 including a spring biasing the dog outwardly and wherein said releasable retaining means is operable to hold the lever against the spring action in the inner position with the dog in engagement with the rack.
Claim 7
Dependent Claim
41 words
Stabilizing means according to claim 2 including a track for connection longitudinally on the side piece and a slider pivotally connected on the upper leg part and sliding on the track, and wherein said lever means are pivoted on the slider.
Claim 8
Dependent Claim
15 words
Stabilizing means according to claim 5 wherein the slider is slidingly confined by the track.
Claim 9
Dependent Claim
30 words
Stabilizing means according to claim 2 wherein the releasable retaining means comprise a catch member which is released by simultaneously lifting it and pushing it inwardly toward the side piece.
Claim 10
Dependent Claim
45 words
Stabilizing means according to claim 7 wherein the catch member pivots with the lever means and has a projecting lip engageable on a catch recess when the catch member is pivoted inwardly, and including a spring biasing the catch member downwardly toward the catch recess.
Claim 11
Dependent Claim
22 words
Stabilizing means according to claim 2 wherein the lower leg part is pivotally connected intermediate the ends of the upper leg part.
Claim 12
Dependent Claim
19 words
Stabilizing means according to claim 2 including spring means tending to urge the lower and upper leg parts upward.
Claim 13
Dependent Claim
20 words
Stabilizing means according to claim 10 wherein the spring means acts between the reaction member and the lower leg part.
Claim 14
Dependent Claim
21 words
A ladder having independently operating stabilizing means as claimed in claim 3 connected on the outer side of each side piece.
References Cited (Backward Citations)
US1151809A
Cited
US1385319A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-02 | 1982-10-02 | 1983-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-02 | 1986-10-02 | 1987-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-02 | 1990-10-02 | 1991-04-03 | $7700.00 | Window Closed / Lapsed |