Patent US4016945A successfully refreshed from Google Patents.
US4016945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motorcycle with a water cooled engine
Assignee: Yamaha Motor Co Ltd
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Filing: 1976-03-03
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Granted: 1977-04-12
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Expires: 1996-03-03
Abstract
Abstract A motorcycle driven by a water cooled engine mounted on a frame includes a radiator attached to a front fork rotated with a handle. A water circulating system between the engine and the radiator is constructed by a head pipe and a steering shaft rotatably inserted through the head pipe.
Inventors
- 👤 Hirotaka Shibata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:41
CPC Classifications
B; B62; B62M; B62M7/00; B62M7/02; B62J; B62J41/00; B62K; B62K11/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
216 words
A motorcycle with a water cooled engine comprising a frame having a head pipe at one end, a water cooled engine fitted to said frame, a steering shaft rotatably inserted through said head pipe, a control handle and a front fork for supporting a front wheel of said motorcycle, fixed to said steering shaft, a radiator fitted to said front fork, a flow-in side liquid chamber and flow-out side liquid chamber defined by the inner periphery of said head pipe and the outer periphery of said steering shaft separately from each other, a flow-in side liquid passageway and flow-out side liquid passageway formed in said steering shaft separately from each other, a pair of communication bores formed in said steering shaft respectively communicating between said flow-in side liquid chamber and flow-in side liquid passageway and between said flow-out side liquid chamber and flow-out side liquid passageway, first and second tubes connecting said liquid chambers to said water cooled engine, respectively, and third and fourth tubes connecting both said liquid passageways to said radiator, respectively, whereby cooling water within said radiator circulates to pass through said fourth tube, flow-out liquid passageway, flow-out side liquid chamber, second tube, water-cooled engine, first tube, flow-in side liquid chamber, flow-in side liquid passageway and third tube to return to said radiator.
Claim 2
Dependent Claim
216 words
A motorcycle with a water cooled engine comprising a frame having a head pipe at one end, a water cooled engine fitted to said frame, a steering shaft rotatably inserted through said head pipe, a control handle and a front fork for supporting a front wheel of said motorcycle, fixed to said steering shaft, a radiator fitted to said front fork, a flow-in side liquid chamber and flow-out side liquid chamber defined by the inner periphery of said head pipe and the outer periphery of said steering shaft separately from each other, a flow-in side liquid passageway and flow-out side liquid passageway formed in said steering shaft separately from each other, a pair of communication bores formed in said steering shaft respectively communicating between said flow-in side liquid chamber and flow-in side liquid passageway and between said flow-out side liquid chamber and flow-out side liquid passageway, first and second tubes connecting said liquid chambers to said water cooled engine, respectively, and third and fourth tubes connecting both said liquid passageways to said radiator, respectively, whereby cooling water within said radiator circulates to pass through said fourth tube, flow-out liquid passageway, flow-out side liquid chamber, second tube, water-cooled engine, first tube, flow-in side liquid chamber, flow-in side liquid passageway and third tube to return to said radiator.
Claim 3
Dependent Claim
20 words
A motorcycle according to claim 1, wherein said radiator is mounted on an upper end portion of said front fork.
Claim 4
Dependent Claim
58 words
A motorcycle according to claim 2, wherein said radiator is positioned parallel to said head pipe; said third tube is connected between an end of said radiator and an end of said flow-in side liquid passageway; and said fourth tube is connected between the other end of said radiator and an end of said flow-out side liquid passageway.
Claim 5
Dependent Claim
24 words
A motorcycle according to claim 2, wherein said front fork is fitted with a racing number adjacent to a front face of said radiator.
Claim 6
Dependent Claim
19 words
A motorcycle according to claim 2, wherein said front fork is fitted with a front fender below said radiator.
Claim 7
Dependent Claim
68 words
A motorcycle according to claim 1, wherein said flow-in side liquid chamber is defined between an upper seal member provided within an end of said head pipe and an intermediate seal member provided at an intermediate portion of said head pipe; and said flow-out side liquid chamber is defined between a lower seal member provided within the other end of said head pipe and said intermediate seal member.
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) | 1980-04-11 | 1980-10-11 | 1981-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-11 | 1984-10-11 | 1985-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-11 | 1988-10-11 | 1989-04-12 | $7700.00 | Window Closed / Lapsed |