US3756564A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power control winch
Assignee: Gearmatic Co Ltd
•
Filing: 1970-10-05
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Granted: 1973-09-04
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Expires: 1990-10-05
Abstract
Abstract A winch having an integral control system wherein the clutch and brake mechanism are hydraulically actuated and the hydraulic actuating system is positioned in the winch housing. The system includes the oil supply, the control valve, the hydraulic pump and an accumulator. The pump is self-compensating and is mounted to be continually actuated by a shaft in the drive train to the winch drum. To reduce the volume of hydraulic fluid normally required in a hydraulic system and to improve the reliability, the valve is a unique no-leak type with the inlet through a bore in the valve spool and an outlet located along only one side of the spool and the valve is used in conjunction with an accumulator which allows release of the brake after shut down of the drive train. The brake mechanism comprises multi-wrap brake bands which are spring-actuated and hydraulically released, the multi-wrap enables relatively high braking force produced by a minimal spring actuating force.
Inventors
- 👤 J Murray
- 👤 S Christison
- 👤 W Bonar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:43
CPC Classifications
B; B66; B66D; B66D1/00; B66D1/02; B66D1/14; B66D1/28; B66D1/40; B66D1/42; B66D1/44; B66D5/00; B66D5/02; B66D5/24; B66D5/26; B66D2700/00; B66D2700/01; B66D2700/0125; B66D2700/0158; B66D2700/03; B66D2700/035
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
246 words
A self contained fluid pressure controlled winch comprising: a. a self contained winch housing adapted for containing a winch mechanism and adapted for mounting on various types of vehicles and like equipment; b. a winch drum rotatably mounted in said housing; c. a rotatable power input shaft; d. a gear train connected with said power input shaft; e. fluid operated clutch means for selectively connecting said gear train with said winch drum; f. fluid operated brake means for selectively holding said drum against rotational movement with respect to said housing; and g. fluid control means mounted on said housing for selectively actuating said clutch means and said brake means, said fluid control means including: 1. a fluid reservoir contained entirely within said housing, 2. fluid pump means connected with said gear train and said reservoir and mounted entirely within said housing for converting the rotational energy of said gear train into fluid pressure, 3. accumulator means mounted entirely within said housing for storing fluid pressure for continued operation of the fluid control means should said fluid pump means fail to operate 4. valve control means for selectively directing fluid pressure from said fluid pump means or said accumulator means to said clutch means and said brake means, said valve control means including a fluid valve contained entirely within said housing, and 5. valve operator means extending through said housing for selectively actuating said fluid valve to direct fluid to said brake means or said clutch means.
Claim 2
Dependent Claim
246 words
A self contained fluid pressure controlled winch comprising: a. a self contained winch housing adapted for containing a winch mechanism and adapted for mounting on various types of vehicles and like equipment; b. a winch drum rotatably mounted in said housing; c. a rotatable power input shaft; d. a gear train connected with said power input shaft; e. fluid operated clutch means for selectively connecting said gear train with said winch drum; f. fluid operated brake means for selectively holding said drum against rotational movement with respect to said housing; and g. fluid control means mounted on said housing for selectively actuating said clutch means and said brake means, said fluid control means including: 1. a fluid reservoir contained entirely within said housing, 2. fluid pump means connected with said gear train and said reservoir and mounted entirely within said housing for converting the rotational energy of said gear train into fluid pressure, 3. accumulator means mounted entirely within said housing for storing fluid pressure for continued operation of the fluid control means should said fluid pump means fail to operate 4. valve control means for selectively directing fluid pressure from said fluid pump means or said accumulator means to said clutch means and said brake means, said valve control means including a fluid valve contained entirely within said housing, and 5. valve operator means extending through said housing for selectively actuating said fluid valve to direct fluid to said brake means or said clutch means.
Claim 3
Dependent Claim
29 words
fluid pump means connected with said gear train and said reservoir and mounted entirely within said housing for converting the rotational energy of said gear train into fluid pressure,
Claim 4
Dependent Claim
29 words
fluid pump means connected with said gear train and said reservoir and mounted entirely within said housing for converting the rotational energy of said gear train into fluid pressure,
Claim 5
Dependent Claim
50 words
A self contained fluid pressure controlled winch as defined in claim 1, wherein said fluid operated brake means includes a double wrapped band secured to said winch housing at only one point and a brake actuating mechanism connected with said double wrapped band and supported solely at said one point.
Claim 6
Dependent Claim
27 words
accumulator means mounted entirely within said housing for storing fluid pressure for continued operation of the fluid control means should said fluid pump means fail to operate
Claim 7
Dependent Claim
27 words
accumulator means mounted entirely within said housing for storing fluid pressure for continued operation of the fluid control means should said fluid pump means fail to operate
Claim 8
Dependent Claim
97 words
A self contained fluid pressure controlled winch as defined in claim 1 wherein said gear train includes a cam and said fluid pump means includes a self compensating pump having a piston actuated by said cam and having biasing means for biaSing said piston into engagement with said cam, said piston including fluid differential means for restricting movement of said piston incident to increased fluid pressure to limit operation of said pump means to those periods when the fluid pressure is below a predetermined level, said fluid differential means including a differential annular area on said piston.
Claim 9
Dependent Claim
44 words
A self contained fluid pressure controlled winch as defined in claim 3 wherein said piston further includes a valve seat slidingly mounted therein, said valve seat including a through bore and a check valve for restricting fluid flowing in one direction within said bore.
Claim 10
Dependent Claim
39 words
valve control means for selectively directing fluid pressure from said fluid pump means or said accumulator means to said clutch means and said brake means, said valve control means including a fluid valve contained entirely within said housing, and
Claim 11
Dependent Claim
39 words
valve control means for selectively directing fluid pressure from said fluid pump means or said accumulator means to said clutch means and said brake means, said valve control means including a fluid valve contained entirely within said housing, and
Claim 12
Dependent Claim
24 words
valve operator means extending through said housing for selectively actuating said fluid valve to direct fluid to said brake means or said clutch means.
Claim 13
Dependent Claim
24 words
valve operator means extending through said housing for selectively actuating said fluid valve to direct fluid to said brake means or said clutch means.
Claim 14
Dependent Claim
26 words
A self contained fluid pressure controlled winch as defined in claim 1 wherein said accumulator means is interconnected between said pump means and said valve means.
Claim 15
Dependent Claim
81 words
A self contained fluid controlled winch as defined in claim 1 wherein said brake means includes a primary band and a secondary band, one end of said secondary band being secured to said winch housing and the other end of said secondary band being interconnected to one end of said primary band, a hydraulic cylinder interconnected to said primary band and adapted to release the braking action of both brake bands incident to the application of hydraulic fluid to the cylinder.
Claim 16
Dependent Claim
42 words
A self contained fluid controlled winch as defined in claim 6 wherein said brake bands are wrapped in a direction which tightens the bands incident to rotation in one direction of said drum when spring pressure is applied to said primary band.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |