Patent US3753578A successfully refreshed from Google Patents.
US3753578A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Front fork construction for a cycle
Assignee: RUPP IND INC US
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Filing: 1972-02-25
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Granted: 1973-08-21
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Expires: 1992-02-25
Abstract
Abstract A front fork construction for a cycle in which circumferential rib and groove engagements near the lower end of an inner bearing or lining tube retain it in the upper load tube and retain a ferrule in fixed position on the upper tube and in sliding engagement with the lower tube for excluding dust from the sliding joint between the tube.
Inventors
- 👤 H Rupp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:21
CPC Classifications
B; B62; B62K; B62K25/00; B62K25/04; B62K25/06; B62K25/08; B62K2201/00; B62K2201/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
47 words
A front fork assembly for a cycle comprising an upper load tube, an anti-friction lining tube therewithin, a lower load tube in said lining tube and a ferrule around the upper tube, slidably engaging the lower tube and fixed in position by interengagement with the lining tube.
Claim 2
Dependent Claim
47 words
A front fork assembly for a cycle comprising an upper load tube, an anti-friction lining tube therewithin, a lower load tube in said lining tube and a ferrule around the upper tube, slidably engaging the lower tube and fixed in position by interengagement with the lining tube.
Claim 3
Dependent Claim
35 words
The combination of elements set forth in claim 1 in which the lower end of the lining tube has rib and groove engagement with the lower end of the upper tube and with the ferrule.
Claim 4
Dependent Claim
36 words
The combination of elements set forth in claim 1 in which the lower end of the inner tube is slotted longitudinally and rendered inwardly deflectable for assembly in interlocking engagement with the upper tube and ferrule.
Claim 5
Dependent Claim
46 words
The combination of elements set forth in claim 2 in which one rib on the lining tube lies adjacent to the lower end of the upper tube and extends radially outward beyond the outer surface of the upper tube and into a groove in the ferrule.
Claim 6
Dependent Claim
43 words
The combination of elements set forth in claim 1 in which the ferrule and the lower end of the upper tube have annular inwardly facing grooves and the lower end of the lining tube has outwardly projecting ribs to seat in said grooves.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |