Patent US3971571A successfully refreshed from Google Patents.
US3971571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Front wheel suspension unit for motorcycles
Assignee: KYB Corp
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Filing: 1975-04-30
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Granted: 1976-07-27
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Expires: 1995-04-30
Abstract
Abstract A front wheel suspension unit for motorcycles, in which the center part of a crank-shaped bent shaft having two parallel axes is taken as the axle, so that buffer effects may be produced against impact inputs in the horizontal direction of movement as well as in the vertical direction, and the wheel is supported, rotating freely around the axis of the said axle, while the other shaft part of the said bent shaft is held at the lower part of the front fork, so that the wheel may be supported while turning freely around the axis of the said shaft part.
Inventors
- 👤 Koji Yoshioka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:10
CPC Classifications
F; F16; F16F; F16F15/00; F16F15/02; F16F15/04; B; B60; B60G; B60G11/00; B62; B62K; B62K25/00; B62K25/04; B62K25/06; B62K25/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
174 words
A motorcycle front wheel suspension unit, comprising a telescopic front fork having a lower end portion; a front wheel provided with a center hub having opposite axial ends; an axle freely rotatably journalled in said hub and having end portions which extend outwardly past said axle ends; a pair of elongated link members extending transversely of said axle and each having a first section mounted on one of said end portions and a longitudinally spaced second section; and a pair of mounting shafts extending parallel to said axle and each having one part mounted in one of said second sections and another part freely turnably journalled in said lower end portion of said front fork, said other parts being axially aligned with one another and defining a pivot axis, said wheel being free to normally rotate relative to said front fork about said axle, but when subjected to a substantially horizontally acting force being free to yield to the same by pivoting with said axle relative to said front fork about said pivot axis.
Claim 2
Dependent Claim
174 words
A motorcycle front wheel suspension unit, comprising a telescopic front fork having a lower end portion; a front wheel provided with a center hub having opposite axial ends; an axle freely rotatably journalled in said hub and having end portions which extend outwardly past said axle ends; a pair of elongated link members extending transversely of said axle and each having a first section mounted on one of said end portions and a longitudinally spaced second section; and a pair of mounting shafts extending parallel to said axle and each having one part mounted in one of said second sections and another part freely turnably journalled in said lower end portion of said front fork, said other parts being axially aligned with one another and defining a pivot axis, said wheel being free to normally rotate relative to said front fork about said axle, but when subjected to a substantially horizontally acting force being free to yield to the same by pivoting with said axle relative to said front fork about said pivot axis.
Claim 3
Dependent Claim
91 words
A motorcycle front wheel suspension unit, comprising a front wheel having a hub located in its center part; an axle freely rotatably extending through the center of said hub; link members fixed to both ends of said axle; bearing shafts extending outwards from respective lower parts of said link members parallel to said axle; an angle control device mounting said link members with said bearing shafts thereon symmetrically to said ends of said axle; and a telescopic front fork having a lower part wherein said bearing shafts are freely rotatably supported.
Claim 4
Dependent Claim
91 words
A motorcycle front wheel suspension unit, comprising a front wheel having a hub located in its center part; an axle freely rotatably extending through the center of said hub; link members fixed to both ends of said axle; bearing shafts extending outwards from respective lower parts of said link members parallel to said axle; an angle control device mounting said link members with said bearing shafts thereon symmetrically to said ends of said axle; and a telescopic front fork having a lower part wherein said bearing shafts are freely rotatably supported.
Claim 5
Dependent Claim
34 words
A unit as stated in claim 2, wherein said link members and said bearing shafts are separate elements; and further comprising screws connecting each of said link members with one of said bearing shafts.
Claim 6
Dependent Claim
26 words
A unit as stated in claim 3, wherein at least one of the bearing shafts has a base provided with an adjusting nut for controlling spacing.
Claim 7
Dependent Claim
50 words
A unit as stated in claim 3, wherein at least one of the link members is inserted on the axle so that the link member is movable in the axial direction, and is provided with a tap bolt, so that it may be fixed at a stipulated position and angle.
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) | 1979-07-27 | 1980-01-26 | 1980-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-27 | 1984-01-26 | 1984-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-27 | 1988-01-26 | 1988-07-27 | $7700.00 | Window Closed / Lapsed |