US3797325A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two speed primary drive assembly for hydraulic winch
Assignee: Gearmatic Co Ltd
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Filing: 1971-06-07
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Granted: 1974-03-19
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Expires: 1991-06-07
Abstract
Abstract This invention relates to a two-speed primary drive assembly for a hydraulic winch whereby the winch may be used in either a fast or slow range of speed depending upon the function for which it is used. The primary drive has no neutral position so that the shift is directly from one speed to another and the speed change is done with the winch in a locked or ''''brake-on'''' position. The change of gears during a time when the shafts are not free to rotate is made possible by incorporation of cylindrical change gears having every second spline tooth removed and adapted to engage with a shifter sleeve likewise having every second spline tooth removed. The front portion of the splines on both the change gears and the shifter sleeve are chamfered to allow camming of the two elements about their axes when the front portions are axially forced into contact with each other. The change gears are rotationally spring biased such that they are continuously urged to a position whereat the splines are respectively centered.
Inventors
- 👤 Christison Sommerville
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:54
CPC Classifications
B; B66; B66D; B66D1/00; B66D1/02; B66D1/14; B66D1/22; B66D1/225; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19219; Y10T74/19284
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
247 words
A multiple speed drive assembly, comprising A. a support; B. an input shaft and an output shaft rotatably mounted, respectively, on said support; and C. gear change means interconnecting said input and output shafts for selectively varying the drive ratio between said input and output shafts, said gear change means including 1. a first gear train having a first predetermined ratio, 2. a second gear train having a second predetermined ratio different from said first predetermined ratio, and 3. shifter means mounted within said housing for maintaining at all times a positive drive between said input and output shafts, said shifter means including a. selector gear means for connecting said input shaft to said output shaft through said first gear train when said selector gear means is in a first position and for connecting said input shaft to said output shaft through said second gear train when said selector gear means is in a second position, said selector gear means including first and second change gears adapted to selectively engage said first and second gear trains, respectively, and b. synchro mesh mounting means connected between one of said shafts and said change gears for permitting limited rotational movement of said change gears relative to said one of said shafts as said selector gear means is moved between said first and second positions, whereby said selector gear means is adapted to mesh with said first and second gear trains even though said input and output shafts are stationary.
Claim 2
Dependent Claim
247 words
A multiple speed drive assembly, comprising A. a support; B. an input shaft and an output shaft rotatably mounted, respectively, on said support; and C. gear change means interconnecting said input and output shafts for selectively varying the drive ratio between said input and output shafts, said gear change means including 1. a first gear train having a first predetermined ratio, 2. a second gear train having a second predetermined ratio different from said first predetermined ratio, and 3. shifter means mounted within said housing for maintaining at all times a positive drive between said input and output shafts, said shifter means including a. selector gear means for connecting said input shaft to said output shaft through said first gear train when said selector gear means is in a first position and for connecting said input shaft to said output shaft through said second gear train when said selector gear means is in a second position, said selector gear means including first and second change gears adapted to selectively engage said first and second gear trains, respectively, and b. synchro mesh mounting means connected between one of said shafts and said change gears for permitting limited rotational movement of said change gears relative to said one of said shafts as said selector gear means is moved between said first and second positions, whereby said selector gear means is adapted to mesh with said first and second gear trains even though said input and output shafts are stationary.
Claim 3
Dependent Claim
16 words
a second gear train having a second predetermined ratio different from said first predetermined ratio, and
Claim 4
Dependent Claim
16 words
a second gear train having a second predetermined ratio different from said first predetermined ratio, and
Claim 5
Dependent Claim
56 words
A drive assembly as in claim 1 wherein the shifter means includes a splined sleeve mounted upon the input shaft, which sleeve is selectively, axially moveable from a first position engaging the first gear train to a second position engaging the second gear train while being engaged with at least one gear train at all times.
Claim 6
Dependent Claim
25 words
A drive assembly as in claim 1 wherein the change gears are each adapted to selectively engage a sun gear of a planetary gear system.
Claim 7
Dependent Claim
168 words
shifter means mounted within said housing for maintaining at all times a positive drive between said input and output shafts, said shifter means including a. selector gear means for connecting said input shaft to said output shaft through said first gear train when said selector gear means is in a first position and for connecting said input shaft to said output shaft through said second gear train when said selector gear means is in a second position, said selector gear means including first and second change gears adapted to selectively engage said first and second gear trains, respectively, and b. synchro mesh mounting means connected between one of said shafts and said change gears for permitting limited rotational movement of said change gears relative to said one of said shafts as said selector gear means is moved between said first and second positions, whereby said selector gear means is adapted to mesh with said first and second gear trains even though said input and output shafts are stationary.
Claim 8
Dependent Claim
168 words
shifter means mounted within said housing for maintaining at all times a positive drive between said input and output shafts, said shifter means including a. selector gear means for connecting said input shaft to said output shaft through said first gear train when said selector gear means is in a first position and for connecting said input shaft to said output shaft through said second gear train when said selector gear means is in a second position, said selector gear means including first and second change gears adapted to selectively engage said first and second gear trains, respectively, and b. synchro mesh mounting means connected between one of said shafts and said change gears for permitting limited rotational movement of said change gears relative to said one of said shafts as said selector gear means is moved between said first and second positions, whereby said selector gear means is adapted to mesh with said first and second gear trains even though said input and output shafts are stationary.
Claim 9
Dependent Claim
39 words
A dRive assembly as in claim 1 wherein the ends of the change gears are chamfered, whereby the relative axial movement of said gear and contact of the chamfered portion causes relative rotational movement in the event of misalignment.
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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) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |