US4273498A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Railway car trap door lift
Assignee: Bombardier Corp
•
Filing: 1979-11-07
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Granted: 1981-06-16
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Expires: 1999-11-07
Abstract
Abstract A railway car includes conventional steps leading from a lower station platform to the floor level in a vestibule. A lift platform adapted to receive a seat or wheel chair is provided to lift a handicapped person who has difficulty going up or down steps. A motor is provided for moving the lift platform over the steps between the lower level and floor level while maintaining it in a horizontal position.
Inventors
- 👤 William W. Dickhart, III
- 👤 Richard H. Marvin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:13
CPC Classifications
B; B61; B61D; B61D47/00; A; A61; A61G; A61G3/00; A61G3/02; A61G3/06; A61G3/062; B61D23/00; A61G2220/00; A61G2220/12; Y; Y10; Y10S; Y10S414/00; Y10S414/134
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
89 words
In combination with a railway car having steps leading from a lower level outside of the railway car to a higher level inside the railway car, (a) a movable platform connected to said car having stationary means for securing and positioning a wheeled vehicle thereon against rolling movement in both directions; (b) means for moving said platform over said steps between said lower and higher levels, and (c) means for maintaining said platform in a horizontal position as it is moved from said lower level to said higher level.
Claim 2
Dependent Claim
89 words
In combination with a railway car having steps leading from a lower level outside of the railway car to a higher level inside the railway car, (a) a movable platform connected to said car having stationary means for securing and positioning a wheeled vehicle thereon against rolling movement in both directions; (b) means for moving said platform over said steps between said lower and higher levels, and (c) means for maintaining said platform in a horizontal position as it is moved from said lower level to said higher level.
Claim 3
Dependent Claim
40 words
A combination as set forth in claim 1 wherein a bar linkage is connected between said platform and said car and driving means are provided to drive said bar linkage to move said platform between said lower and higher levels.
Claim 4
Dependent Claim
45 words
A combination as set forth in claim 2 wherein said higher level is on the same level as a floor of said railway car and said platform is over said steps at the same level as said floor when it is at said higher level.
Claim 5
Dependent Claim
34 words
A combination as set forth in claim 3 wherein said securing means comprise first and second strips connected to said platform to provide obstacles to prevent a wheel chair from rolling off said platform.
Claim 6
Dependent Claim
41 words
A combination as set forth in claim 4 wherein a third strip is provided in close proximity to said first strip with a groove therebetween to permit a door of said car to pass therein during an opening and closing operation.
Claim 7
Dependent Claim
20 words
A combination as set forth in claim 5 wherein a support member is connected on the side of said platform.
Claim 8
Dependent Claim
32 words
A combination as set forth in claim 6 wherein a seat member is connected to said support member, with means being provided to maintain said seat member in a vertical horizontal position.
Claim 9
Dependent Claim
31 words
A combination as set forth in claim 7 wherein said bar linkage comprises two pairs of bars disposed to move in different parallel vertical planes when said platform is being moved.
Claim 10
Dependent Claim
25 words
A combination as set forth in claim 8 wherein said driving means comprises an electric motor and a chain drive connected to said bar linkage.
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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) | 1984-06-15 | 1984-12-15 | 1985-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-15 | 1988-12-15 | 1989-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-15 | 1992-12-15 | 1993-06-16 | $7700.00 | Window Closed / Lapsed |