US3834514A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Escalator
Assignee: NIHON ALGONQUIN KK
•
Filing: 1973-01-02
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Granted: 1974-09-10
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Expires: 1993-01-02
Abstract
Abstract A portable escalator for use in a structure, such as a cargo hold of large ships, comprising a number of step means pivotally mounted one after the other on a pair of endless chain members each entrained about two sprocket wheels which are rotatably mounted on a main frame of the escalator respectively at each end thereof. Either one of the two sprocket wheels is operatively connected to a suitable actuating power source. Each of step means includes a desired number of crescent-shaped vertical plates spaced one from each other similarly to comb teeth so as to eliminate the need of feathering action of each step means during operation even when the portable escalator is used at different inclinations.
Inventors
- 👤 M Wakamatsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:36
CPC Classifications
B; B66; B66B; B66B21/00; B66B21/02; B66B21/04; Y; Y02; Y02B; Y02B50/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
205 words
A portable escalator comprising elongated frame means having upper and lower ends, a pair of sprocket wheels rotatably mounted at each of said ends, endless chain means adapted to couple the sprocket wheels at said upper ends with the sprocket wheels at said lower ends, a landing platform at each of said ends having comblike teeth, a plurality of steps operatively connected to said endless chain means for movement thereby between said upper and lower ends, supporting shafts carrying roller means attached on both sides of said steps, a pair of guide members disposed on either side of said frame means for supporting and guiding said roller means, each of said steps including a plurality of plates extending above said frame means and being disposed in spaced parallel relation to each other, so as to mesh with the teeth of said landing platform, and each of said plates having a crescent-shaped profile whereby a load is automatically transferred from said plates onto said landing platform as said plates move under the teeth of a landing platform, and the plates in said steps being separate individual members having holes at their front and rear said shafts extending through said holes to hold said plates in position.
Claim 2
Dependent Claim
205 words
A portable escalator comprising elongated frame means having upper and lower ends, a pair of sprocket wheels rotatably mounted at each of said ends, endless chain means adapted to couple the sprocket wheels at said upper ends with the sprocket wheels at said lower ends, a landing platform at each of said ends having comblike teeth, a plurality of steps operatively connected to said endless chain means for movement thereby between said upper and lower ends, supporting shafts carrying roller means attached on both sides of said steps, a pair of guide members disposed on either side of said frame means for supporting and guiding said roller means, each of said steps including a plurality of plates extending above said frame means and being disposed in spaced parallel relation to each other, so as to mesh with the teeth of said landing platform, and each of said plates having a crescent-shaped profile whereby a load is automatically transferred from said plates onto said landing platform as said plates move under the teeth of a landing platform, and the plates in said steps being separate individual members having holes at their front and rear said shafts extending through said holes to hold said plates in position.
References Cited (Backward Citations)
US669528A
Cited
US2981397A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |