US3687253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power assisted clutch
Assignee: Doosan Bobcat North America Inc
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Filing: 1970-07-22
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Granted: 1972-08-29
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Expires: 1990-07-22
Abstract
Abstract A power released and spring applied friction clutch having fluid powered mechanism for releasing the clutch and directing fluid onto the clutch for cooling.
Inventors
- 👤 Elmer G Bjorklund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:54
CPC Classifications
F; F16; F16D; F16D25/00; F16D25/08; F16D25/082; F16D25/087
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
154 words
In a power assisted clutch having a first clutch member, a second clutch member, and means cooperating with said members to connect said members for conjoint rotation and disconnect said members from conjoint rotation, a fluid operated means for actuatiNg said connecting and disconnecting means to disconnect said members and for directing fluid onto said members, comprising a stationary sleeve, said sleeve having a first portion and a second portion of reduced diameter, a bearing assembly axially slidable in operation and disposed on said second portion to engage said connecting and disconnecting means, a collar disposed to slide axially relative to said first portion, said sleeve, assembly and collar cooperating to define a fluid chamber of variable volume, first fluid passage means for supplying pressurized fluid to said chamber, second fluid passage means for directing fluid from said chamber onto said members, and means for varying the restriction to fluid flow through said chamber.
Claim 2
Dependent Claim
154 words
In a power assisted clutch having a first clutch member, a second clutch member, and means cooperating with said members to connect said members for conjoint rotation and disconnect said members from conjoint rotation, a fluid operated means for actuatiNg said connecting and disconnecting means to disconnect said members and for directing fluid onto said members, comprising a stationary sleeve, said sleeve having a first portion and a second portion of reduced diameter, a bearing assembly axially slidable in operation and disposed on said second portion to engage said connecting and disconnecting means, a collar disposed to slide axially relative to said first portion, said sleeve, assembly and collar cooperating to define a fluid chamber of variable volume, first fluid passage means for supplying pressurized fluid to said chamber, second fluid passage means for directing fluid from said chamber onto said members, and means for varying the restriction to fluid flow through said chamber.
Claim 3
Dependent Claim
47 words
A clutch as set forth in claim 1 wherein said collar is slidably telescoped over said bearing assembly and includes a shoulder which cooperates with an adjacent surface of said assembly to increasingly restrict fluid flow through said chamber as said collar is moved toward said assembly.
Claim 4
Dependent Claim
29 words
A clutch as set forth in claim 1 wherein said collar and said bearing assembly are independently axially slidable in relation to said first and second sleeve portions, respectively.
Claim 5
Dependent Claim
36 words
A clutch as claimed in claim 3 wherein the volume of said fluid chamber increases as said collar moves axially towards said bearing assembly and decreases as said collar moves axially away from said bearing assembly.
Claim 6
Dependent Claim
33 words
A clutch as claimed in claim 1 wherein said means for restricting fluid flow through said chamber operates to increase the restriction as the collar and bearing assembly move to increase chamber volume.
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) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |