Patent US3858905A successfully refreshed from Google Patents.
US3858905A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Demountable safety ladder with hand rail
Assignee: Individual
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Filing: 1973-07-19
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Granted: 1975-01-07
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Expires: 1993-07-19
Abstract
Abstract The demountable stairs comprise stairs, hook assemblies fastened on bars issuing forwardly from the uppermost terminal end of the stairs, each of the hook assemblies comprising a lug fastened to the forwardmost terminal ends of the bars in a socket fastened on the bumper or similar structure roll member of the vehicle into which the lugs are engagable; and a coupling bracket which provides underbracing to the demountable stairs and which is engagable with the hitching ball commonly provided on the vehicle bumper.
Inventors
- 👤 Delbert W Peebles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:24
CPC Classifications
B; B60; B60R; B60R3/00; B60R3/007
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
267 words
A demountable safety ladder comprising: stairs, including a pair of tall exposed stringers, treads fastened horizontally and transversely between said stringers, and a platform at the uppermost terminal end of said stringers; hook assemblies fastened to the forwardmost terminal ends of bars issuing forwardly, with respect to said vehicle, from the uppermost terminal end of said stringers at said platform, each of said hook assemblies comprising lugs fastened at the forwardmost terminal ends of said bars, and sockets fastened to a suitable structural member of a vehicle said socket having a mounting plate and a raised hollow enclosure moulded centrally to the uppermost terminal side of said mounting plat, the forwardmost terminal side of said enclosure having an entranceway through which said lug may pass, and a rectilinear slot in the upper walls of said enclosure cut from the rearwardmost side of said entranceway through which said bars carrying said lug may pass; and a coupling bracket including a pivotally mounted knee-frame having a pair of rectilinearly disposed L-shaped brace members, each having a substantial vertical member and a horizontal member issuing forwardly at the uppermost terminal end of said vertical member each of said brace members pivotally fastened distally below the uppermost terminal end of said stringer and each of said brace members having a contracting face which may make lowermost terminal side of said stringer, the forwardmost terminal ends of said brace members being connected by a transversely disposed bar, and a hitching ball fastened centrally in said transverse bar of said knee-frame to be engageable with a hitching ball provided on said structural member.
Claim 2
Dependent Claim
267 words
A demountable safety ladder comprising: stairs, including a pair of tall exposed stringers, treads fastened horizontally and transversely between said stringers, and a platform at the uppermost terminal end of said stringers; hook assemblies fastened to the forwardmost terminal ends of bars issuing forwardly, with respect to said vehicle, from the uppermost terminal end of said stringers at said platform, each of said hook assemblies comprising lugs fastened at the forwardmost terminal ends of said bars, and sockets fastened to a suitable structural member of a vehicle said socket having a mounting plate and a raised hollow enclosure moulded centrally to the uppermost terminal side of said mounting plat, the forwardmost terminal side of said enclosure having an entranceway through which said lug may pass, and a rectilinear slot in the upper walls of said enclosure cut from the rearwardmost side of said entranceway through which said bars carrying said lug may pass; and a coupling bracket including a pivotally mounted knee-frame having a pair of rectilinearly disposed L-shaped brace members, each having a substantial vertical member and a horizontal member issuing forwardly at the uppermost terminal end of said vertical member each of said brace members pivotally fastened distally below the uppermost terminal end of said stringer and each of said brace members having a contracting face which may make lowermost terminal side of said stringer, the forwardmost terminal ends of said brace members being connected by a transversely disposed bar, and a hitching ball fastened centrally in said transverse bar of said knee-frame to be engageable with a hitching ball provided on said structural member.
Claim 3
Dependent Claim
42 words
The apparatus of claim 1 wherein each of said hook assemblies includes a lug having a transversely disposed plate and wherein said socket member includes an enclosure having a flat wall to be substantially mateable with said plate portion of said lug.
Claim 4
Dependent Claim
30 words
The apparatus of claim 1 including a handrail comprising an upstanding baluster fastened at the forwardmost terminal end to a point distally from the uppermost terminal end of the stringer.
Claim 5
Dependent Claim
37 words
The apparatus of claim 3 wherein said baluster is pivotally fastened to said stringer and said stringer is provided with a frictional clip to detachably secure said baluster when said handrail is in a substantially vertical 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) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |