US3851739A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hoist reversing transmission with centrifugal speed control
Assignee: Twin Disc Inc
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Filing: 1973-09-04
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Granted: 1974-12-03
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Expires: 1993-09-04
Abstract
Abstract A load lowering and control system for hoist machinery, such as is found on cranes, shovels, or other types of hoists, and in which lowering system of the load is positively controlled by means of a centrifugally operated valve means which in turn controls the amount of modulation of a friction type, load lowering clutch.
Inventors
- 👤 K Schneider
- 👤 L Adams
- 👤 C Hilpert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:30
CPC Classifications
F; F16; F16H; F16H47/00; F16H47/06; B; B66; B66D; B66D1/00; B66D1/28; B66D1/40; B66D1/42; B66D1/44; F16H61/00; F16H61/02; F16H61/0262; F16H45/00; F16H2045/002; F16H2045/005; F16H2710/00; F16H2710/04; F16H2710/06; F16H2710/10; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19023; Y10T74/19037; Y10T74/19149; Y10T74/19153
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
235 words
A power transmission and control system for raising and lowering hoist mechanism comprising, a power source, a torque converter connected to said power source and driven thereby, a modulatable friction type input clutch disengagably connected between said power source and said torque converter, centrifugally actuated hydraulic valve means connected with said modulatable clutch for regulating the output speed of said clutch and the input speed of said torque converter, a modulatable friction type ''''up'''' clutch connected to said torque converter for being driven thereby and also being connected to a hoist mechanism driving shaft for driving said hoist mechanism in a load raising position when said ''''up'''' clutch is engaged, a modulatable friction type ''''down'''' clutch connected to said hoist mmechanism driving shaft, power transmitting means connected between said power source and said friction type ''''down'''' clutch, and centrifugally actuated hydraulic valve means connected to said ''''up'''' and ''''down'''' clutches for causing selective engagement of said ''''up'''' clutch or said ''''down'''' clutch whereby when said ''''up'''' clutch is disengaged and said ''''down'''' clutch is engaged, said power transmitting means transmits power from said power source through said ''''down'''' clutch and to said hoist mechanism to drive the latter positively in a load lowering direction and to automatically release said ''''down'''' clutch and engage said ''''up'''' clutch during overspeed of said hoist mechanism, and control means for regulating both of said centrifugally actuated hydraulic valve means.
Claim 2
Dependent Claim
235 words
A power transmission and control system for raising and lowering hoist mechanism comprising, a power source, a torque converter connected to said power source and driven thereby, a modulatable friction type input clutch disengagably connected between said power source and said torque converter, centrifugally actuated hydraulic valve means connected with said modulatable clutch for regulating the output speed of said clutch and the input speed of said torque converter, a modulatable friction type ''''up'''' clutch connected to said torque converter for being driven thereby and also being connected to a hoist mechanism driving shaft for driving said hoist mechanism in a load raising position when said ''''up'''' clutch is engaged, a modulatable friction type ''''down'''' clutch connected to said hoist mmechanism driving shaft, power transmitting means connected between said power source and said friction type ''''down'''' clutch, and centrifugally actuated hydraulic valve means connected to said ''''up'''' and ''''down'''' clutches for causing selective engagement of said ''''up'''' clutch or said ''''down'''' clutch whereby when said ''''up'''' clutch is disengaged and said ''''down'''' clutch is engaged, said power transmitting means transmits power from said power source through said ''''down'''' clutch and to said hoist mechanism to drive the latter positively in a load lowering direction and to automatically release said ''''down'''' clutch and engage said ''''up'''' clutch during overspeed of said hoist mechanism, and control means for regulating both of said centrifugally actuated hydraulic valve means.
Claim 3
Dependent Claim
298 words
A power transmission and control system for raising and lowering hoist mechanism of a machine and comprising, a power source, a torque converter connected to said power source and having an impeller driven thereby and also having a turbine member driven by said impeller, a modulatable friction type input clutch disengagably connected between said power source and said impeller, centrifugally actuated hydraulic valve means connected with said modulatable clutch for regulating the output speed of said clutch and the input speed of said torque converter. a normally engaged and modulatable friction plate type ''''up'''' clutch connected to said turbine member of said torque converter for being driven thereby and said normally engaged ''''up'''' clutch also being connected to a hoist mechanism driving shaft for driving said hoist mechanism in a load raising position when said normally engaged ''''up'''' clutch is engaged, a modulatable friction plate type ''''down'''' clutch connected to said hoist mechanism driving shaft, power transmitting means connected between said power source and said friction plate type ''''down'''' clutch, and centrifugally actuated hydraulic valve means connected to said ''''up'''' and ''''down'''' clutches for causing selective engagement of said normally engaged ''''up'''' clutch or said ''''down'''' clutch whereby when said normally engaged ''''up'''' clutch is disengaged and said ''''down'''' clutch is engaged, said power transmitting means transmits power from said power source through said ''''down'''' clutch and to said hoist mechanism to drive the latter positively in a load lowering direction and to automatically release said ''''down'''' clutch and engage said ''''up'''' clutch during overspeed of said hoist mechanism, and control means for regulating the fluid pressure selectively to said centrifugally actuated hydraulic valve means of said modulatable friction plate type input clutch and to said centrifugal valve means of said normally engaged ''''up'''' clutch and ''''down'''' clutch.
Claim 4
Dependent Claim
298 words
A power transmission and control system for raising and lowering hoist mechanism of a machine and comprising, a power source, a torque converter connected to said power source and having an impeller driven thereby and also having a turbine member driven by said impeller, a modulatable friction type input clutch disengagably connected between said power source and said impeller, centrifugally actuated hydraulic valve means connected with said modulatable clutch for regulating the output speed of said clutch and the input speed of said torque converter. a normally engaged and modulatable friction plate type ''''up'''' clutch connected to said turbine member of said torque converter for being driven thereby and said normally engaged ''''up'''' clutch also being connected to a hoist mechanism driving shaft for driving said hoist mechanism in a load raising position when said normally engaged ''''up'''' clutch is engaged, a modulatable friction plate type ''''down'''' clutch connected to said hoist mechanism driving shaft, power transmitting means connected between said power source and said friction plate type ''''down'''' clutch, and centrifugally actuated hydraulic valve means connected to said ''''up'''' and ''''down'''' clutches for causing selective engagement of said normally engaged ''''up'''' clutch or said ''''down'''' clutch whereby when said normally engaged ''''up'''' clutch is disengaged and said ''''down'''' clutch is engaged, said power transmitting means transmits power from said power source through said ''''down'''' clutch and to said hoist mechanism to drive the latter positively in a load lowering direction and to automatically release said ''''down'''' clutch and engage said ''''up'''' clutch during overspeed of said hoist mechanism, and control means for regulating the fluid pressure selectively to said centrifugally actuated hydraulic valve means of said modulatable friction plate type input clutch and to said centrifugal valve means of said normally engaged ''''up'''' clutch and ''''down'''' clutch.
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) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |