US3642253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealed silent winch
Assignee: Plasmachem Inc
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Filing: 1969-06-23
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Granted: 1972-02-15
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Expires: 1989-06-23
Abstract
Abstract A hand-operated winch designed for marine craft and in particular for use as a sailboat sheet winch is disclosed. All braking and bearing elements are sealed and not exposed to the elements. It includes silent one way clutches as opposed to conventional pawl escapements for braking. Several different winch diameters may be produced using a common working mechanism since the drum is separable from the working mechanism. Dual thrust rings allow axial loads to be sustained.
Inventors
- 👤 William C Baldwin
- 👤 Theodore N Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:40
CPC Classifications
B; B66; B66D; B66D1/00; B66D1/60; B66D1/74; B66D1/7421; B66D1/7431; B66D1/7463; B66D1/7468; B66D1/7484
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
249 words
A deck winch comprising: a base for mounting on a deck; an upstanding shaft mounted on said base; a drum including an outer surface for holding working lines and an inner coaxial surface; bearing means engaging said shaft and inner coaxial surface of said drum for mounting said drum for rotation about said shaft; a first sprag clutch encircling said shaft and in one-way braking engagement with said shaft in drum; a separate cap for said winch overlying said drum and including a closed end socket recess for insertion of a handle to drive said winch; said cap including a tubular sleeve portion encircling said upstanding shaft and in rotational engagement therewith; a second sprag clutch engaging the outer surface of said tubular sleeve portion of said cap and an inner surface of said drum whereby said cap and drum are engaged for one-way driving of said drum by said cap; said first and second sprag clutches oriented for braking in opposite directions whereby said cap applies driving force from said cap to said drum when said cap is driven one direction and said drum is braked from rotation in the opposite direction wherein said upstanding shaft includes two step portions and a retaining groove in each step portion; a thrust bearing ring secured to each the first and second step portion of said upstanding shaft; one of said thrust bearings engaging said tubular sleeve portion of said cap; and the second of said thrust bearings engaging said drum.
Claim 2
Dependent Claim
249 words
A deck winch comprising: a base for mounting on a deck; an upstanding shaft mounted on said base; a drum including an outer surface for holding working lines and an inner coaxial surface; bearing means engaging said shaft and inner coaxial surface of said drum for mounting said drum for rotation about said shaft; a first sprag clutch encircling said shaft and in one-way braking engagement with said shaft in drum; a separate cap for said winch overlying said drum and including a closed end socket recess for insertion of a handle to drive said winch; said cap including a tubular sleeve portion encircling said upstanding shaft and in rotational engagement therewith; a second sprag clutch engaging the outer surface of said tubular sleeve portion of said cap and an inner surface of said drum whereby said cap and drum are engaged for one-way driving of said drum by said cap; said first and second sprag clutches oriented for braking in opposite directions whereby said cap applies driving force from said cap to said drum when said cap is driven one direction and said drum is braked from rotation in the opposite direction wherein said upstanding shaft includes two step portions and a retaining groove in each step portion; a thrust bearing ring secured to each the first and second step portion of said upstanding shaft; one of said thrust bearings engaging said tubular sleeve portion of said cap; and the second of said thrust bearings engaging said drum.
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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) | 1975-02-14 | 1975-08-16 | 1976-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-14 | 1979-08-16 | 1980-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-14 | 1983-08-16 | 1984-02-15 | $7700.00 | Window Closed / Lapsed |