Patent US3742580A successfully refreshed from Google Patents.
US3742580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bicycle gear shift repair
Assignee: ALCOA DEV COMMUNITY
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Filing: 1972-04-26
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Granted: 1973-07-03
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Expires: 1992-04-26
Abstract
Abstract A bicycle gear shifting device including a ratchet plate, a pawl, and a spring biasing the pawl for engaging teeth on the plate, no longer functions properly because the spring is unable to exert an adequate bias force; this condition is repaired by connecting a supplemental spring to the device for biasing the pawl into engagement with the ratchet teeth, without replacing the original spring.
Inventors
- 👤 D Sullivan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:36
CPC Classifications
B; B62; B62K; B62K23/00; B62K23/02; B62K23/06; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49462; Y10T29/49718; Y10T74/00; Y10T74/20; Y10T74/20207; Y10T74/20256; Y10T74/20268; Y10T74/2028; Y10T74/20287
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
110 words
A method of repairing a gear shifting device comprising in assembly a ratchet means for pulling a flexible linkage into a plurality of selected positions, pawl means for engaging with ratchet teeth on said ratchet means for locking said ratchet means in any one of said selected positions, and spring means for biasing said pawl means into engagement with said ratchet teeth, which spring means no longer performs its function of biasing said pawl means into engagement with said ratchet teeth, which method comprises connecting a supplemental spring to said device for biasing said pawl means into engagement with said ratchet teeth, without replacing said spring means in said device.
Claim 2
Independent Claim
110 words
A method of repairing a gear shifting device comprising in assembly a ratchet means for pulling a flexible linkage into a plurality of selected positions, pawl means for engaging with ratchet teeth on said ratchet means for locking said ratchet means in any one of said selected positions, and spring means for biasing said pawl means into engagement with said ratchet teeth, which spring means no longer performs its function of biasing said pawl means into engagement with said ratchet teeth, which method comprises connecting a supplemental spring to said device for biasing said pawl means into engagement with said ratchet teeth, without replacing said spring means in said device.
Claim 3
Dependent Claim
45 words
A method as claimed in claim 1, said ratchet means and said pawl means including a common housing, said housing having a rigid turret securred thereto through which said flexible linkage extends, the connecting of the supplemental spring being between said turret and said pawl.
Claim 4
Dependent Claim
21 words
A method as claimed in claim 1, said gear shifting device further including a permanently closed housing about said spring means.
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) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |