US4554994A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ladder safety indicator
Assignee: Individual
•
Filing: 1985-02-05
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Granted: 1985-11-26
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Expires: 2005-02-05
Abstract
Abstract In order to indicate whether a straight or extension ladder is positioned safely for use, a first label is provided on the side rail of the ladder and includes a level for indicating when the ladder is properly angled and a second label and a cooperating pointer are provided at the foot of the ladder to indicate if the base of the ladder is at a safe angle relative to the support surface.
Inventors
- 👤 Robert I. Weiner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:48
CPC Classifications
E; E06; E06C; E06C7/00; E06C7/003; E06C7/42; E06C7/46
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
163 words
A safety indicator for use with a straight or extension ladder of the type having a pair of side rails and a foot pivotally connected to each side rail at the lower end thereof and having a bottom surface for engaging the ladder supporting surface comprising: a first indicator element adapted to be affixed to the side rail of the ladder intermediate the ends thereof and including means for indicating the angle of the principal axis of the side rail relative to the vertical; and a second indicator element including a label adapted to be affixed to the side rail of the ladder in close proximity to the foot, said label having at least two zones defined by lines radiating from the pivotal axis of the foot, and a pointer adapted to be affixed to the foot and extending perpendicular to the bottom surface thereof, said pointer cooperating with said label to indicate the angular relation of the foot to the side rail.
Claim 2
Dependent Claim
163 words
A safety indicator for use with a straight or extension ladder of the type having a pair of side rails and a foot pivotally connected to each side rail at the lower end thereof and having a bottom surface for engaging the ladder supporting surface comprising: a first indicator element adapted to be affixed to the side rail of the ladder intermediate the ends thereof and including means for indicating the angle of the principal axis of the side rail relative to the vertical; and a second indicator element including a label adapted to be affixed to the side rail of the ladder in close proximity to the foot, said label having at least two zones defined by lines radiating from the pivotal axis of the foot, and a pointer adapted to be affixed to the foot and extending perpendicular to the bottom surface thereof, said pointer cooperating with said label to indicate the angular relation of the foot to the side rail.
Claim 3
Dependent Claim
16 words
The safety indicator according to claim 1 wherein said means for indicating comprises a spirit level.
Claim 4
Dependent Claim
26 words
The safety indicator according to claim 2 wherein said first indicator element includes a label having cautionary wording thereon, said level being affixed to said label.
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) | 1988-11-25 | 1989-05-27 | 1989-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-25 | 1993-05-27 | 1993-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-25 | 1997-05-27 | 1997-11-26 | $7700.00 | Window Closed / Lapsed |