Patent US4087945A successfully refreshed from Google Patents.
US4387908A
Expired / Lapsed
US
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Trotter exercising cart
Assignee: Individual
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Filing: 1981-05-01
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Granted: 1983-06-14
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Expires: 2001-05-01
Abstract
Abstract A continuously adjustable braking system for a trotter exercising cart. Hydraulic pumps are connected to the wheels of the cart, and wheel rotation causes the pumps to pump oil from a reservoir through pipes and an adjustable valve and back to the reservoir. The valve can be adjusted by the driver while the cart is moving to provide the desired degree of resistance to oil flow and hence of braking force.
Inventors
- 👤 Tapani Kroger
- 👤 Raimo Luostarinen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:58
CPC Classifications
B; B62; B62C; B62C1/00; B62C1/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
A trotter exercising cart braking system comprising: an oil-tight hollow cart frame; a pair of cart wheels having axles rotatably attached to said frame; a pair of hydraulic pumps fixedly attached to said frame and operably connected to a respective axle; a pair of supply pipes connected between respective pumps and said frame; an adjustable hydraulic valve; a pressure pipe connected between said pumps and said valve; and a return pipe connected between said valve and said frame, whereby oil circulating through said system presents a resistance to said wheels turning, depending on the adjustment of said valve.
Claim 2
Dependent Claim
98 words
A trotter exercising cart braking system comprising: an oil-tight hollow cart frame; a pair of cart wheels having axles rotatably attached to said frame; a pair of hydraulic pumps fixedly attached to said frame and operably connected to a respective axle; a pair of supply pipes connected between respective pumps and said frame; an adjustable hydraulic valve; a pressure pipe connected between said pumps and said valve; and a return pipe connected between said valve and said frame, whereby oil circulating through said system presents a resistance to said wheels turning, depending on the adjustment of said valve.
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) | 1986-06-13 | 1986-12-13 | 1987-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-13 | 1990-12-13 | 1991-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-13 | 1994-12-13 | 1995-06-14 | $7700.00 | Window Closed / Lapsed |