US3968857A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for preventing unauthorized access to permanent ladders
Assignee: Individual
•
Filing: 1975-02-20
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Granted: 1976-07-13
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Expires: 1995-02-20
Abstract
Abstract A shield having a front plate and a pair of side flanges extending rearwardly and outwardly therefrom to a point substantially adjacent a supporting wall or beam substantially encases the ladder and prevents unauthorized use of the ladder. The length of the shield may be considerably reduced by attaching the shield to the ladder at a point above the ground. The front plate is hingedly attached to one of the side flanges and a locking device adjustably mounted on the rungs of the ladder secures the front plate in closed relationship to the face thereof.
Inventors
- 👤 Robin R. Bryan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:58
CPC Classifications
E; E06; E06C; E06C7/00; E06C7/006; E06C9/00; E06C9/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
183 words
An improved safety shield for permanent ladders of the type having a pair of side rails and a plurality of rungs permanently secured to a support structure such as storage tanks, smoke stacks, television towers, tall buildings, bins and silos, said shield comprising: a. a front plate having two longitudinal side edges; b. a pair of side flanges, each of which extends rearwardly and outwardly from one of said side edges in angular relationship thereto to a point substantially adjacent said support structure; c. a hinge means connecting a first of said side flanges and said front plate along juxtaposed side edges; d. at least one support bracket for connecting said first side flange to said ladder, said first side flange substantially abutting said support structure; e. said front plate being movable between a first open position and a second closed position wherein said front plate, side flanges, and supporting structure substantially enclose said ladder and the second side flange substantially abut said support structure to prevent unauthorized access thereto; and f. locking means for securing said front plate in said closed position.
Claim 2
Dependent Claim
183 words
An improved safety shield for permanent ladders of the type having a pair of side rails and a plurality of rungs permanently secured to a support structure such as storage tanks, smoke stacks, television towers, tall buildings, bins and silos, said shield comprising: a. a front plate having two longitudinal side edges; b. a pair of side flanges, each of which extends rearwardly and outwardly from one of said side edges in angular relationship thereto to a point substantially adjacent said support structure; c. a hinge means connecting a first of said side flanges and said front plate along juxtaposed side edges; d. at least one support bracket for connecting said first side flange to said ladder, said first side flange substantially abutting said support structure; e. said front plate being movable between a first open position and a second closed position wherein said front plate, side flanges, and supporting structure substantially enclose said ladder and the second side flange substantially abut said support structure to prevent unauthorized access thereto; and f. locking means for securing said front plate in said closed position.
Claim 3
Dependent Claim
29 words
The safety shield according to claim 1 wherein said shield is mounted on said ladder at a position intermediate the top and bottom thereof, rather than at the bottom.
Claim 4
Dependent Claim
48 words
The safety shield according to claim 1 wherein said support bracket includes mounting means associated herewith for adjustably mounting said bracket and said first side flange to said ladder, so that said shield may be adjustably spaced relative to the face of said ladder and said support surface.
Claim 5
Dependent Claim
70 words
The safety shield according to claim 3 wherein said support bracket comprises a first connecting arm and a second connecting arm disposed angularly to each other, said mounting means including a plurality of openings spaced along said first arm, and fastening means for connecting said first arm to said ladder through selected pairs of said openings, said first side flange being secured to said second arm of said support bracket.
Claim 6
Dependent Claim
88 words
The safety shield according to claim 1 wherein said front plate includes at least one slotted opening therein, said locking means includes a support rod having a hasp secured thereto, said locking bracket being adjustably mounted to the rungs of said ladder at one of a plurality of positions along the length of said support rod, whereby said hasp may be adjusted vertically with respect to said ladder rungs to align with said slotted openings in said front plate when said front plate is in said closed position.
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) | 1979-07-13 | 1980-01-12 | 1980-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-13 | 1984-01-12 | 1984-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-13 | 1988-01-12 | 1988-07-13 | $7700.00 | Window Closed / Lapsed |