US4304318A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ladder levelling system
Assignee: Individual
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Filing: 1980-07-21
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Granted: 1981-12-08
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Expires: 2000-07-21
Abstract
Abstract A ladder levelling device used in combination with a ladder on inclined ground surfaces, which levelling device is placed under one leg of the ladder while the other leg rests on the ground surface or some other support, comprises a triangular, inclined platform including an open cavity area defined in its bottom side. The levelling device provides a stable, as well as a level ladder.
Inventors
- 👤 Allie E. Webb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:24
CPC Classifications
E; E06; E06C; E06C7/00; E06C7/42; E06C7/44
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
186 words
In combination with a ladder or like device including at least two leg members, a ladder levelling device for insertion between one of the leg members and an inclined ground surface, said ladder levelling device comprising; a triangular leg member support platform, said support platform including three side edges, a flat upper surface, and a flat lower surface; a first side wall extending generally perpendicular to said upper surface from said lower surface of said support platform adjacent one of said three side edges, said first side wall including a short end, a tall end and a bottom edge, said bottom edge defining a plane forming an accute angle with a plane defined by said upper surface of said support platform; and a second side wall extending generally perpendicular to said upper surface from said lower surface of said support platorm adjacent a second of said three side edges, said second side wall including a short end, a tall end and a bottom edge, said bottom edge defining a plane forming an accute angle with the plane defined by said upper surface of said support platform.
Claim 2
Dependent Claim
186 words
In combination with a ladder or like device including at least two leg members, a ladder levelling device for insertion between one of the leg members and an inclined ground surface, said ladder levelling device comprising; a triangular leg member support platform, said support platform including three side edges, a flat upper surface, and a flat lower surface; a first side wall extending generally perpendicular to said upper surface from said lower surface of said support platform adjacent one of said three side edges, said first side wall including a short end, a tall end and a bottom edge, said bottom edge defining a plane forming an accute angle with a plane defined by said upper surface of said support platform; and a second side wall extending generally perpendicular to said upper surface from said lower surface of said support platorm adjacent a second of said three side edges, said second side wall including a short end, a tall end and a bottom edge, said bottom edge defining a plane forming an accute angle with the plane defined by said upper surface of said support platform.
Claim 3
Dependent Claim
37 words
Combination of claim 2, wherein said flat upper surface of said support platform defines a right triangle, and said first side wall defines a plane extending generally perpendicular to a plane defined by said second side wall.
Claim 4
Dependent Claim
22 words
Combination of claim 2, wherein said lower surface of said support platform extends parallel to said upper surface of said support platform.
Claim 5
Dependent Claim
84 words
A ladder levelling device, comprising; a triangular ladder support member including a flat upper surface and a flat lower surface; and a first and second side wall, each said side wall extending from said lower surface of said support member, and including a short end, a tall end, and a bottom edge, whereby said upper surface of said support member defines an acute angle with a level ground surface when said side walls are placed with their bottom edges on the level ground surface.
Claim 6
Dependent Claim
84 words
A ladder levelling device, comprising; a triangular ladder support member including a flat upper surface and a flat lower surface; and a first and second side wall, each said side wall extending from said lower surface of said support member, and including a short end, a tall end, and a bottom edge, whereby said upper surface of said support member defines an acute angle with a level ground surface when said side walls are placed with their bottom edges on the level ground surface.
Claim 7
Dependent Claim
27 words
Device of claim 4, wherein said first side wall and said second side wall are arranged perpendicular to one another with their respective tall ends in abutment.
Claim 8
Dependent Claim
178 words
A ladder levelling device for insertion between one of the leg members of a ladder or like device and an inclined ground surface, said levelling device comprising: a triangular leg member support platform, said support platform including three side edges, a flat triangular upper surface, and a flat lower surface; a first side wall extending generally perpendicular to said upper surface from said lower surface of said support platform adjacent one of said three side edges, said first side wall including a short end, a tall end, and a bottom edge, said bottom edge defining a plane forming an accute angle with a plane defined by said upper surface of said support platform; and a second side wall extending generally perpendicular to said upper surface from said lower surface of said support platform adjacent a second of said three side edges, said second side wall including a short end, a tall end and a bottom edge, said bottom edge defining a plane forming an accute angle with the plane defined by said upper surface of said support platform.
Claim 9
Dependent Claim
178 words
A ladder levelling device for insertion between one of the leg members of a ladder or like device and an inclined ground surface, said levelling device comprising: a triangular leg member support platform, said support platform including three side edges, a flat triangular upper surface, and a flat lower surface; a first side wall extending generally perpendicular to said upper surface from said lower surface of said support platform adjacent one of said three side edges, said first side wall including a short end, a tall end, and a bottom edge, said bottom edge defining a plane forming an accute angle with a plane defined by said upper surface of said support platform; and a second side wall extending generally perpendicular to said upper surface from said lower surface of said support platform adjacent a second of said three side edges, said second side wall including a short end, a tall end and a bottom edge, said bottom edge defining a plane forming an accute angle with the plane defined by said upper surface of said support platform.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-12-07 | 1985-06-08 | 1985-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-07 | 1989-06-08 | 1989-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-07 | 1993-06-08 | 1993-12-08 | $7700.00 | Window Closed / Lapsed |