Patent US3876022A successfully refreshed from Google Patents.
US3876022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stairway-climbing cart
Assignee: Sunwa Sharyo Manufacturing Co Ltd
•
Filing: 1973-12-06
•
Granted: 1975-04-08
•
Expires: 1993-12-06
Abstract
Abstract A stairway-climbing cart for lifting loads comprises a carrier frame, a pair of driven belt-crawlers disposed on both sides of the carrier frame, a driving belt-crawler disposed on the central portion of the carrier frame and having a crawling surface positioned for a slight lower level than that of the driven beltcrawlers and having a length spanning between at least two steps.
Inventors
- 👤 Yasuaki Ikarimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:32
CPC Classifications
B; B62; B62D; B62D55/00; B62D55/06; B62D55/075; B62B; B62B5/00; B62B5/02; B62B2301/00; B62B2301/25; B62B2301/256
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
104 words
A stairway-climbing cart for lifting a load on a stairway, comprising a carrier frame, a pair of driven belt-crawlers disposed on both sides of the carrier frame and having idler wheels and endless belts stretching between the wheels and wound to them, a driving belt-crawler disposed on the central portion of the carrier frame and having a driving wheel, a driven wheel and an endless belt stretching between the wheels and wound to them, said endless belt having a crawling surface positioned for a slight lower level than that of the driven belt-crawlers and a length spanning at least two steps of the stairway.
Claim 2
Dependent Claim
104 words
A stairway-climbing cart for lifting a load on a stairway, comprising a carrier frame, a pair of driven belt-crawlers disposed on both sides of the carrier frame and having idler wheels and endless belts stretching between the wheels and wound to them, a driving belt-crawler disposed on the central portion of the carrier frame and having a driving wheel, a driven wheel and an endless belt stretching between the wheels and wound to them, said endless belt having a crawling surface positioned for a slight lower level than that of the driven belt-crawlers and a length spanning at least two steps of the stairway.
Claim 3
Dependent Claim
51 words
A cart for lifting on a stairway claimed in claim 1 in which there are provided a pair of running wheel assemblies detachably joined to the sides of said frame and having carrying wheels positioned near the center of gravity of the weight load, and a handle connected to the body.
Claim 4
Dependent Claim
58 words
A cart for lifting on a stairway claimed in claim 1, further comprising a handle on said frame, the front end portions of the driven belt-crawlers being positioned at a place in which the driving belt-crawler is elevated from the floor and the driven belt-crawlers are carried on the floor when a handle is maintained in an inclination.
Claim 5
Dependent Claim
37 words
A cart for lifting on a stairway claimed in claim 2 in which each endless belt of the driven crawlers is clamped by the static members of the running wheel assembly when the cart rests on floor.
References Cited (Backward Citations)
US2154377A
Cited
US2844413A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |