US3836122A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cable winch
Assignee: Individual
•
Filing: 1972-11-20
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Granted: 1974-09-17
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Expires: 1992-11-20
Abstract
Abstract A three-speed hydraulic winch includes a base, a drum support, a drum shaft mounted on the support, a cable drum rotatable on the drum shaft and means mounting the support on the base for reciprocation substantially parallel to the drum shaft. A cable guide pulley is rotatably mounted in a pulley block which is fixedly mounted on the base. An endless chain traverse means is coupled between the base and the support to reciprocate the support. Four hydraulic motors constitute the drive means, and are operable to rotate a gear having clutch teeth on one face engageable with clutch teeth on a flange of the drum, and a chain and sprocket drive interconnects the drum and the endless chain traverse means. The guide pulley is operatively associated with an angle sensing device controlling the pull of the winch and controlling the load on the drum to a constant predetermined maximum. When the clutch is disengaged and the drum is free to rotate, a disk brake is automatically engaged if there is no tension on the cable, to prevent cable over-ride and hang-up, and this brake is released responsive to cable tension. The clutch cannot be disengaged if the cable is under tension. An extension shaft may be provided for driving a capstan or any other device. The fixed positioning of the cable guide pulley on the base, combined with a traversing movement of the drum, provides for level winding without the cable sweeping across the support during winding on the drum or unwinding therefrom. The pull on the cable is always in line with the guide pulley and there is ''''no side pull,'''' thus maintaining the load at a minimum.
Inventors
- 👤 W Pierce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:11
CPC Classifications
B; B66; B66D; B66D1/00; B66D1/02; B66D1/14; B66D1/28; B66D2700/00; B66D2700/01; B66D2700/0183
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
211 words
A cable winch comprising, in combination, a base; a drum support; a drum shaft mounted on said support; a cable drum rotatable on said drum shaft; means mounting said support on said base for reciprocation substantially parallel to said drum shaft; a cable guide pulley; a pulley block rotatably mounting said pulley and fixedly mounted on said base; drive means selectively operable to rotate said drum to feed cable to and from said drum over said guide pulley; traverse means coupled to said support and to said base and operable to reciprocate said support relative to said base parallel to said drum shaft to effect level winding and unwinding of cable during rotation of said drum; driving mechanism interconnecting said drum and said traverse means; a capstan shaft rotatably mounted on said drum support in spaced parallel relation to said drum shaft and extending outwardly through a side wall of said base; the projecting end of said capstan shaft being designed for engagement by an operating tool to rotate said capstan shaft; a normally engaged clutch interposed between said drive means and said drum and including a clutch drive gear; and gearing continuously interconnecting said gear and said capstan shaft for rotation of said capstan shaft whenever said gear is rotated.
Claim 2
Dependent Claim
211 words
A cable winch comprising, in combination, a base; a drum support; a drum shaft mounted on said support; a cable drum rotatable on said drum shaft; means mounting said support on said base for reciprocation substantially parallel to said drum shaft; a cable guide pulley; a pulley block rotatably mounting said pulley and fixedly mounted on said base; drive means selectively operable to rotate said drum to feed cable to and from said drum over said guide pulley; traverse means coupled to said support and to said base and operable to reciprocate said support relative to said base parallel to said drum shaft to effect level winding and unwinding of cable during rotation of said drum; driving mechanism interconnecting said drum and said traverse means; a capstan shaft rotatably mounted on said drum support in spaced parallel relation to said drum shaft and extending outwardly through a side wall of said base; the projecting end of said capstan shaft being designed for engagement by an operating tool to rotate said capstan shaft; a normally engaged clutch interposed between said drive means and said drum and including a clutch drive gear; and gearing continuously interconnecting said gear and said capstan shaft for rotation of said capstan shaft whenever said gear is rotated.
Claim 3
Dependent Claim
77 words
A cable winch, as claimed in claim 1, in which said drive means comprises hydraulic motor means driving one element of said clutch; and a pilot valve controlling supply of hydraulic fluid to said hydraulic motor means; said rocker including a cam cooperable with said pilot valve and operable, responsive to slack in the cable, to close said hydraulic valve to prevent supply of hydraulic fluid to said hydraulic motor means to arrest rotation of said drum.
Claim 4
Dependent Claim
272 words
A cable winch comprising, in combination, a base; a drum support; a drum shaft mounted on said support; a cable drum rotatable on said drum shaft; means mounting said support on said base for reciprocation substantially parallel to said drum shaft; a cable guide pulley; a pulley block rotatably mounting said pulley and fixedly mounted on said base; drive means selectively operable to rotate said drum to feed cable to and from said drum over said guide pulley; traverse means coupleD to said support and to said base and operable to reciprocate said support relative to said base parallel to said drum shaft to effect level winding and unwinding of cable during rotation of said drum; driving mechanism interconnecting said drum and said traverse means; a normally engaged clutch interposed between said drive means and said drum; said drive means comprising hydraulic motor means driving one element of said clutch; and cable tension sensing means operatively associated with said cable guide pulley; said tension sensing means comprising a shaft rotatably supporting said guide pulley; a pendulous rocker oscillatably mounted on said pulley shaft; a pair of further pulleys rotatably mounted on said rocker and having the cable, trained over said guide pulley, passing over said further pulleys; a disk brake normally engaged with said drum to prevent rotation thereof; and a normally closed switch effecting engagement of said disk brake with said drum; said rocker, responsive to tension in said cable, engaging an operator of said normally closed switch to open said switch and, responsive to slack in the cable, disengaging said switch operator to effect closing of said normally closed switch.
Claim 5
Dependent Claim
272 words
A cable winch comprising, in combination, a base; a drum support; a drum shaft mounted on said support; a cable drum rotatable on said drum shaft; means mounting said support on said base for reciprocation substantially parallel to said drum shaft; a cable guide pulley; a pulley block rotatably mounting said pulley and fixedly mounted on said base; drive means selectively operable to rotate said drum to feed cable to and from said drum over said guide pulley; traverse means coupleD to said support and to said base and operable to reciprocate said support relative to said base parallel to said drum shaft to effect level winding and unwinding of cable during rotation of said drum; driving mechanism interconnecting said drum and said traverse means; a normally engaged clutch interposed between said drive means and said drum; said drive means comprising hydraulic motor means driving one element of said clutch; and cable tension sensing means operatively associated with said cable guide pulley; said tension sensing means comprising a shaft rotatably supporting said guide pulley; a pendulous rocker oscillatably mounted on said pulley shaft; a pair of further pulleys rotatably mounted on said rocker and having the cable, trained over said guide pulley, passing over said further pulleys; a disk brake normally engaged with said drum to prevent rotation thereof; and a normally closed switch effecting engagement of said disk brake with said drum; said rocker, responsive to tension in said cable, engaging an operator of said normally closed switch to open said switch and, responsive to slack in the cable, disengaging said switch operator to effect closing of said normally closed switch.
Claim 6
Dependent Claim
197 words
A cable winch comprising, in combination, a drum support; a drum shaft mounted on said support; a cable drum rotatable on said drum shaft; hydraulic motor means in driving connection with said drum; cable tension sensing means operatively associated with the cable; a pilot valve included in said tension sensing means and controlling supply of hydraulic fluid to said hydraulic motor means and operable, responsive to slack in the cable, to prevent supply of hydraulic fluid to said hydraulic motor means and operable, responsive to slack in the cable, to prevent supply of hydraulic fluid to said hydraulic motor means to arrest rotation of said drum; said hydraulic motor means comprising: four hydraulic motors operable to rotate said drum; electromagnetically operated valve means selectively operable to connect said motors in parallel to a source of hydraulic fluid under pressure, for low speed high torque operation of said winch, to connect said motors in series to said source for high speed low torque operation of said winch, and to connect said motors in series-parallel to said source for intermediate speed operation of said winch; and speed selector switch means connected in controlling relation with said electromagnetically operated valves.
Claim 7
Dependent Claim
197 words
A cable winch comprising, in combination, a drum support; a drum shaft mounted on said support; a cable drum rotatable on said drum shaft; hydraulic motor means in driving connection with said drum; cable tension sensing means operatively associated with the cable; a pilot valve included in said tension sensing means and controlling supply of hydraulic fluid to said hydraulic motor means and operable, responsive to slack in the cable, to prevent supply of hydraulic fluid to said hydraulic motor means and operable, responsive to slack in the cable, to prevent supply of hydraulic fluid to said hydraulic motor means to arrest rotation of said drum; said hydraulic motor means comprising: four hydraulic motors operable to rotate said drum; electromagnetically operated valve means selectively operable to connect said motors in parallel to a source of hydraulic fluid under pressure, for low speed high torque operation of said winch, to connect said motors in series to said source for high speed low torque operation of said winch, and to connect said motors in series-parallel to said source for intermediate speed operation of said winch; and speed selector switch means connected in controlling relation with said electromagnetically operated valves.
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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) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |