Patent US3866727A successfully refreshed from Google Patents.
US3866727A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid operated clutch and brake with dashpot
Assignee: Dana Inc
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Filing: 1974-01-18
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Granted: 1975-02-18
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Expires: 1994-01-18
Abstract
Abstract A clutch and operating means therefor are disclosed. The clutch includes a brake and the operating means comprises a multiple piston cylinder arrangement. One piston is operatively connected to both the clutch collar and the brake. A first part of the travel of the first piston effects disengagement of the clutch and travel beyond this point effects engagement of the brake. The travel of the first piston is limited, when braking is not desired, by a second piston working in opposition to the first. A third piston is arranged to provide a controlled release rate of the first piston and slow re-engagement of the clutch.
Inventors
- 👤 Gerald L Myers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:04
CPC Classifications
F; F16; F16D; F16D67/00; F16D67/02; F16D67/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
172 words
In a clutch including an input, an output, a brake, a shift means having first, second and third positions and wherein said input and output are connected when said shift means is in said first position and disconnected when said shift means is in said second and third positions and wherein said brake is actuated when said shift means is in said third position and an actuating means associated with said shift means the improvement wherein said actuating means comprises a cylinder having first, second and third pistons therein, said first piston being operatively connected to said shift means, said second piston being shiftable between a first position allowing travel of said first piston to said third position thereof, and a second position, limiting travel of said first position to said second position thereof, said third piston being adapted to allow free travel of said first piston from said first to said second and third positions thereof and to inhibit travel of said first piston from said second and third positions thereof.
Claim 2
Dependent Claim
172 words
In a clutch including an input, an output, a brake, a shift means having first, second and third positions and wherein said input and output are connected when said shift means is in said first position and disconnected when said shift means is in said second and third positions and wherein said brake is actuated when said shift means is in said third position and an actuating means associated with said shift means the improvement wherein said actuating means comprises a cylinder having first, second and third pistons therein, said first piston being operatively connected to said shift means, said second piston being shiftable between a first position allowing travel of said first piston to said third position thereof, and a second position, limiting travel of said first position to said second position thereof, said third piston being adapted to allow free travel of said first piston from said first to said second and third positions thereof and to inhibit travel of said first piston from said second and third positions thereof.
Claim 3
Dependent Claim
29 words
The clutch of claim 1 wherein a rod operatively connects said first piston to said shift means and said second piston is slidably and concentrically mounted on said rod.
Claim 4
Dependent Claim
17 words
The clutch of claim 2 wherein said second piston has a greater diameter than said first piston.
Claim 5
Dependent Claim
24 words
The clutch of claim 1 wherein said first piston includes walls defining a chamber therein and said third piston is carried within said chamber.
Claim 6
Dependent Claim
29 words
The clutch of claim 4 wherein a rod operatively connects said first piston to said shift means and said second piston is slidably and concentrically mounted on said rod.
Claim 7
Dependent Claim
17 words
The clutch of claim 5, wherein said second piston has a greater diameter than said first piston.
Claim 8
Dependent Claim
58 words
The clutch of claim 6 including a single source of pressure for biasing said pistons, a first valve for selectively admitting pressure to said first piston for biasing said piston away from said first position thereof and a second valve for selectively admitting pressure to said second piston for biasing said piston away from said first position thereof.
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) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |