US3759042A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid pressure driving device
Assignee: KAYATA KOGYO KK
•
Filing: 1971-05-14
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Granted: 1973-09-18
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Expires: 1991-05-14
Abstract
Abstract A liquid pressure driving device for selective change of the rotary speed of a load member within its allowable output torque, which permits a change in a speed ratio from several to ten times or more between low and high speeds by use of a plurality of liquid pressure motors which are coupled to the load member which and are separated into individual pairs with a different displacement per revolution of the load member with such an arrangement as to make it possible to change connections of such liquid pressure motors in one of such pairs in either the forward or the reverse direction.
Inventors
- 👤 S Shioda
- 👤 F Ogasahara
- 👤 M Otomo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:54
CPC Classifications
F; F16; F16H; F16H39/00; F16H39/02; Y; Y10; Y10S; Y10S60/00; Y10S60/905
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
159 words
A liquid pressure driving device comprising in combination: a liquid pressure pump; a motor means;, said pump operatively driven and rotated by said motor means; a reservoir; a load member; at least a first liquid pressure motor and a second liquid pressure motor operatively coupled to said load member; a valve means selectively coupled to either of said first or second liquid pressure motor for selectively controlling the respective rotary direction of said first and second liquid pressure motors; a feeding circuit passage means connected to said liquid pressure pump; an additional valve means; said first liquid pressure motor connected in one operative condition to said feeding circuit passage means via said additional valve means; and a liquid drain passage means; said first liquid pressure motor connected in a second operative condition to said reservoir via said liquid drain passage means; said second liquid pressure motor operatively connected to the respective non-operative condition of said first liquid pressure motor.
Claim 2
Dependent Claim
159 words
A liquid pressure driving device comprising in combination: a liquid pressure pump; a motor means;, said pump operatively driven and rotated by said motor means; a reservoir; a load member; at least a first liquid pressure motor and a second liquid pressure motor operatively coupled to said load member; a valve means selectively coupled to either of said first or second liquid pressure motor for selectively controlling the respective rotary direction of said first and second liquid pressure motors; a feeding circuit passage means connected to said liquid pressure pump; an additional valve means; said first liquid pressure motor connected in one operative condition to said feeding circuit passage means via said additional valve means; and a liquid drain passage means; said first liquid pressure motor connected in a second operative condition to said reservoir via said liquid drain passage means; said second liquid pressure motor operatively connected to the respective non-operative condition of said first liquid pressure motor.
Claim 3
Dependent Claim
26 words
A liquid pressure driving device according to claim 1 wherein said first liquid pressure motor has a different volume capacity than said second liquid pressure motor.
Claim 4
Dependent Claim
27 words
A liquid pressure driving device according to claim 1 wherein said first and second liquid pressure motors are structurally arranged as an integrated double liquid pressure motor.
Claim 5
Dependent Claim
42 words
A liquid pressure driving device according to claim 1, and including a reduction mechanism selectively coupled to either said first or said second liquid pressure motor and wherein each of said first and second liquid pressure motors has the same volume capacity.
Claim 6
Dependent Claim
27 words
A liquid pressure driving device according to claim 1 and including a reversible clutch member selectively coupled to either said first or said second liquid pressure motor.
Claim 7
Dependent Claim
26 words
A liquid pressure driving device according to claim 5 wherein said first liquid pressure motor has a different volume capacity than said second liquid pressure motor.
Claim 8
Dependent Claim
24 words
A liquid pressure driving device according to claim 5 wherein each of said first and second liquid pressure motors has the same volume capacity.
Claim 9
Dependent Claim
20 words
A liquid pressure driving device according to claim 1 wherein said first mentioned valve means is a two position valve.
Claim 10
Dependent Claim
20 words
A liquid pressure driving device according to claim 1 wherein said first mentioned valve means is a three position valve.
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) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |