US3572638A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manually operated winch
Assignee: Mitsui Engineering and Shipbuilding Co Ltd
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Filing: 1969-09-24
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Granted: 1971-03-30
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Expires: 1989-09-24
Abstract
Abstract A winch for a wire-winding drum in which the drum has an internally toothed ratchet having three pawls spaced circumferentially about the ratchet with the first pawl operating to advance the drum, the second pawl operating to prevent reverse rotation of the drum and the third pawl operating to arrest the drum when the first two pawls are disengaged. The third pawl is arranged so that it cannot engage the ratchet when the first two pawl are engaged and automatically escapes the ratchet when the drum reverses.
Inventors
- 👤 Masamitsu Tatsuguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:44
CPC Classifications
B; B66; B66D; B66D1/00; B66D1/60; B66D1/74; B66D1/7421; B66D1/7431; Y; Y10; Y10T; Y10T74/00; Y10T74/15; Y10T74/1526; Y10T74/1553; Y10T74/1555
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
125 words
A manually operated winch comprising: a drum for winding a wire providing an internally toothed ratchet, a cam follower pivotally provided in said drum, an advancing pawl provided on said cam follower to engage with said ratchet, a detent pawl provided to prevent reverse rotation of said drum, an arresting pawl operable to escape in reverse rotation of said ratchet, a manually operable cam mechanism to rotate said cam follower, means for holding said arresting pawl in the condition engaging with said ratchet and changing means for said pawls to engage with or disengage from said ratchet, said pawls are so arranged that said arresting pawl can not engage within teeth of said ratchet when said advancing pawl and detent pawl engage with said ratchet.
Claim 2
Dependent Claim
125 words
A manually operated winch comprising: a drum for winding a wire providing an internally toothed ratchet, a cam follower pivotally provided in said drum, an advancing pawl provided on said cam follower to engage with said ratchet, a detent pawl provided to prevent reverse rotation of said drum, an arresting pawl operable to escape in reverse rotation of said ratchet, a manually operable cam mechanism to rotate said cam follower, means for holding said arresting pawl in the condition engaging with said ratchet and changing means for said pawls to engage with or disengage from said ratchet, said pawls are so arranged that said arresting pawl can not engage within teeth of said ratchet when said advancing pawl and detent pawl engage with said ratchet.
Claim 3
Dependent Claim
30 words
A manually operated winch in accordance with claim 1 wherein said manually operable cam mechanism has a high load cam and low load cam and means for changing said cams.
Claim 4
Dependent Claim
44 words
A manually operated winch in accordance with claim 1 wherein said changing means comprise changing levers and spring provided between ends of said levers and pawls and are so arranged that the directions of forces of said springs for said pawls may be inverted.
References Cited (Backward Citations)
US3175805A
Cited
US3224735A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |