Patent US3895699A successfully refreshed from Google Patents.
US3895699A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Double drum winch
Assignee: Komatsu Ltd
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Filing: 1974-03-14
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Granted: 1975-07-22
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Expires: 1994-03-14
Abstract
Abstract A double drum winch having a hook drum and a boom drum is provided in which power from a power source is transmitted through high and low speed clutches, hook up and down moving clutches, boom up and down moving clutches, and hook brake, and boom brake to the respective drums. A high and low speed switching control valve controls the clutches, and at least two control valves are provided for operating the drums.
Inventors
- 👤 Masazo Mita
- 👤 Masami Hashimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:38
CPC Classifications
B; B66; B66D; B66D1/00; B66D1/28; B66D1/40; B66D1/42; B66D1/44; B66D1/02; B66D1/14; B66D1/16; B66D1/18; B66D1/26
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
174 words
A double-drum winch having a source of power, comprising: a. high and low speed clutches connected to the source of power; b. hook up and down moving clutches connected to said high and low speed clutches for upwardly and downwardly moving the hook; c. boom up and down moving clutches connected to said high and low speed clutches for upwardly and downwardly moving the boom; d. a hook brake connected to said hook down moving clutch; e. a boom brake connected to said boom down moving clutch; f. a hook drum connected to the brake shaft of said hook brake; g. a boom drum connected to the brake shaft of said boom brake; h. a hook operating valve for switching the hook up and down moving clutches and hook brake; i. a boom operating valve for switching said boom up and down moving clutches and boom brake; and, j. high and low speed switching control valve for switching said high and low speed clutches, whereby said boom and said hook may be independently operated.
Claim 2
Dependent Claim
174 words
A double-drum winch having a source of power, comprising: a. high and low speed clutches connected to the source of power; b. hook up and down moving clutches connected to said high and low speed clutches for upwardly and downwardly moving the hook; c. boom up and down moving clutches connected to said high and low speed clutches for upwardly and downwardly moving the boom; d. a hook brake connected to said hook down moving clutch; e. a boom brake connected to said boom down moving clutch; f. a hook drum connected to the brake shaft of said hook brake; g. a boom drum connected to the brake shaft of said boom brake; h. a hook operating valve for switching the hook up and down moving clutches and hook brake; i. a boom operating valve for switching said boom up and down moving clutches and boom brake; and, j. high and low speed switching control valve for switching said high and low speed clutches, whereby said boom and said hook may be independently operated.
Claim 3
Dependent Claim
47 words
A double-drum winch as set forth in claim 1, wherein said hook and boom brakes are engaged by the tension of a spring means and disengaged by hydraulic pressure, and said clutches all are engaged by hydraulic pressure and disengaged by the tension of the spring means.
Claim 4
Dependent Claim
21 words
A double-drum winch as set forth in claim 1, wherein said hook drum and boom drum are coaxial with each other.
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) | 1978-07-21 | 1979-01-20 | 1979-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-21 | 1983-01-20 | 1983-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-21 | 1987-01-20 | 1987-07-22 | $7700.00 | Window Closed / Lapsed |