US3826337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Retractable ladder
Assignee: Caterpillar Inc
•
Filing: 1973-06-28
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Granted: 1974-07-30
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Expires: 1993-06-28
Abstract
Abstract A retractable ladder is in the form of a generally U-shaped member adapted for operative use in a vertical position and which may be stored in an inoperative position within the supporting body by lifting the bottom rung or step and pushing the ladder into the body. Optional stops are provided on the ladder for limiting its travel. Optional hand grip means are also provided.
Inventors
- 👤 N Liptak
- 👤 B Echerd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:11
CPC Classifications
B; B60; B60R; B60R3/00; B60R3/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
132 words
In combination a ladder and means defining a side support surface comprising a vehicle frame, said ladder comprising a generally U-shaped member defining a pair of arms joined by a bottom step member, hook members formed on the ends of the arms opposite to the bottom step member, a pair of spaced holes in said vehicle frame and whereby said arms extend through and spaced from said holes, such that the ladder may be moved to a generally vertical operative position parallel to the vehicle frame as well as to an inoperative position by raising the bottom step and moving the ladder into said vehicle frame and further including a step means in said vehicle frame located between said arms and spaced from said bottom support member when in the operative position.
Claim 2
Dependent Claim
132 words
In combination a ladder and means defining a side support surface comprising a vehicle frame, said ladder comprising a generally U-shaped member defining a pair of arms joined by a bottom step member, hook members formed on the ends of the arms opposite to the bottom step member, a pair of spaced holes in said vehicle frame and whereby said arms extend through and spaced from said holes, such that the ladder may be moved to a generally vertical operative position parallel to the vehicle frame as well as to an inoperative position by raising the bottom step and moving the ladder into said vehicle frame and further including a step means in said vehicle frame located between said arms and spaced from said bottom support member when in the operative position.
Claim 3
Dependent Claim
17 words
The invention of claim 1 further including stop members on said arms adjacent the bottom step member.
Claim 4
Dependent Claim
41 words
The invention of Claim 1 wherein said holes are dimensioned with respect to said arms received therein so as to allow the arms to position themselves at a lower level than that of the horizontal step when in the inoperative position.
Claim 5
Dependent Claim
22 words
The invention of claim 1 further including a spacer means on said vehicle frame for spacing said arms from said vehicle frame.
Claim 6
Dependent Claim
30 words
The invention of claim 4 wherein said spacer means is a spacer block mounted on said vehicle frame in a location to contact said arms when in the operative position.
Claim 7
Dependent Claim
19 words
The invention of claim 1 further including hand grip means on said frame for use when mounting said ladder.
References Cited (Backward Citations)
US2809849A
Cited
US2868386A
Cited
US2922557A
Cited
US3357719A
Cited
US3498410A
Cited
US3584704A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-29 | 1978-01-28 | 1978-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-29 | 1982-01-28 | 1982-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-29 | 1986-01-28 | 1986-07-30 | $7700.00 | Window Closed / Lapsed |