Patent US4604078A successfully refreshed from Google Patents.
US4604078A
Expired / Lapsed
US
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Three-stage speed change front derailleur
Assignee: Shimano Inc
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Filing: 1985-03-22
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Granted: 1986-08-05
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Expires: 2005-03-22
Abstract
Abstract A three-stage speed change front derailleur which shifts a driving chain to one of three front chain gears of different diameter to thereby change the speed includes a linkage mechanism comprising a fixing member, a pair of linkage members and a movable member provided with an inner guide plate and an outer guide plate, the movable member pivotally supporting a shift plate which is positioned below the inner guide plate, and which serves to shift the chain from a smaller diameter chain gear to a middle diameter chain gear, and is pivoted to the movable member in relation of being movable away from a larger diameter chain gear.
Inventors
- 👤 Masashi Nagano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:21
CPC Classifications
B; B62; B62M; B62M9/00; B62M9/04; B62M9/06; B62M9/10; B62M9/12; B62M9/131; B62M9/136; B62M9/134; B62M9/1344; B62M9/1348
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
203 words
A three-stage speed change front derailleur for shifting a driving chain to one of three speed change stages respectively corresponding to three front chain gears of different diameter comprising: a fixing member, a pair of linkage members, and a movable member provided with an inner guide plate, an outer guide plate and a shift plate, said shift plate functioning with said inner guide plate to shift said driving chain to a middle speed change stage and being positioned below said inner guide plate so as to serve to shift said driving chain from a smaller diameter front chain gear to a middle diameter front chain gear, said shift plate being pivoted to said movable member in relation of being swingable between a speed change operating position where said chain can be shifted by said shift plate to said middle diameter chain gear and a position where said shift plate moves away from said speed change operating position as said movable member moves from a position corresponding to said middle speed change state toward a position of shifting a chain to a larger diameter front chain gear, said front derailleur having biasing means for biasing said shift plate toward said speed change operating position.
Claim 2
Dependent Claim
203 words
A three-stage speed change front derailleur for shifting a driving chain to one of three speed change stages respectively corresponding to three front chain gears of different diameter comprising: a fixing member, a pair of linkage members, and a movable member provided with an inner guide plate, an outer guide plate and a shift plate, said shift plate functioning with said inner guide plate to shift said driving chain to a middle speed change stage and being positioned below said inner guide plate so as to serve to shift said driving chain from a smaller diameter front chain gear to a middle diameter front chain gear, said shift plate being pivoted to said movable member in relation of being swingable between a speed change operating position where said chain can be shifted by said shift plate to said middle diameter chain gear and a position where said shift plate moves away from said speed change operating position as said movable member moves from a position corresponding to said middle speed change state toward a position of shifting a chain to a larger diameter front chain gear, said front derailleur having biasing means for biasing said shift plate toward said speed change operating position.
Claim 3
Dependent Claim
53 words
A three-stage speed change front derailleur as in claim 1, wherein said shift plate moves away from said speed stage operating position by means of contact of said chain with said larger diameter chain gear as said movable member moves toward said position of shifting a chain to said larger diameter chain gear.
Claim 4
Dependent Claim
50 words
A three-stage speed change front derailleur as set forth in claim 2, wherein said shift plate is provided with mounting segments through which said shift plate is mounted to said movable member, said mounting segments having stoppers abutting against said inner guide plate to set the speed change operating position.
Claim 5
Dependent Claim
30 words
A three-stage speed change front derailleur as set forth in claim 2, wherein said shift plate is pivoted to a pivot pin pivoting said movable member to said linkage members.
Claim 6
Dependent Claim
65 words
A three-stage speed change front derailleur as set forth in claim 2, wherein a spring force of said biasing means is set larger than a resistance against speed change when said chain is moving and is shifted from said smaller diameter front chain gear to said middle diameter front chain gear and smaller than a resistance against speed change when said chain is not moving.
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) | 1989-08-04 | 1990-02-03 | 1990-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-04 | 1994-02-03 | 1994-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-04 | 1998-02-03 | 1998-08-05 | $7700.00 | Window Closed / Lapsed |