Patent US4171054A successfully refreshed from Google Patents.
US4171054A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Work vehicle with hydraulic circuit for swivel motor and work assembly arm motor
Assignee: Kubota Corp
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Filing: 1977-12-22
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Granted: 1979-10-16
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Expires: 1997-12-22
Abstract
Abstract A work vehicle having a work arm assembly mounted for horizontal oscillation on a swivel platform. The arm assembly and the swivel platform are actuated by separate hydraulic actuators. The two actuators are connected in parallel with one another to a control valve via a circuit selection valve. The arrangement enables the swivel platform and the arm assembly to move in the same direction by operating the control valve.
Inventors
- 👤 Ryoichi Tanaka
- 👤 Tadao Adachi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:32
CPC Classifications
E; E02; E02F; E02F9/00; E02F9/20; E02F9/22; E02F9/2278; E02F9/2292; E02F3/00; E02F3/04; E02F3/96; E02F3/963; E02F3/964; E02F9/08; E02F9/10; E02F9/12; E02F9/121; E02F9/123; E02F9/2221; E02F9/2239; F; F15; F15B; F15B11/00; F15B11/16; F15B11/17; F15B2211/00; F15B2211/20; F15B2211/205; F15B2211/20576; F15B2211/30; F15B2211/305; F15B2211/30505; F15B2211/3056; F15B2211/30585; F15B2211/3059; F15B2211/30595; F15B2211/31; F15B2211/3105; F15B2211/3116; F15B2211/70; F15B2211/71; F15B2211/7142; F15B2211/78
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
119 words
A work vehicle having a swivel platform (3) mounted on a chassis (2), a work arm assembly (A) mounted for horizontal oscillation on the swivel platform (3), and a hydraulic circuit enabling the swivel platform (3) and the work arm assembly (A) to be actuated by means of separate hydraulic actuators (M), (13) said hydraulic circuit comprising; a control valve (V 6 ) connected to said actuators (M), (13) in parallel, and a passage selection valve (V 10 ) interposed between said control valve (V 6 ) and said actuators (M), (13), the swivel platform (3) and the arm assembly (A) being movable in the same direction as the control valve (V 6 ) is operated in one direction.
Claim 2
Dependent Claim
119 words
A work vehicle having a swivel platform (3) mounted on a chassis (2), a work arm assembly (A) mounted for horizontal oscillation on the swivel platform (3), and a hydraulic circuit enabling the swivel platform (3) and the work arm assembly (A) to be actuated by means of separate hydraulic actuators (M), (13) said hydraulic circuit comprising; a control valve (V 6 ) connected to said actuators (M), (13) in parallel, and a passage selection valve (V 10 ) interposed between said control valve (V 6 ) and said actuators (M), (13), the swivel platform (3) and the arm assembly (A) being movable in the same direction as the control valve (V 6 ) is operated in one direction.
Claim 3
Dependent Claim
60 words
A work vehicle as defined in claim 1 further comprising; travel means (1), (1') provided on both sides of the vehicle, hydraulic travel motors (M 1 ), (M 2 ) to drive said travel means (1), (1'), respectively, and two pumps (P 1 ), (P 2 ) to supply fluid to said motors (M 1 ), (M 2 ) separately.
Claim 4
Dependent Claim
56 words
A work vehicle as defined in claim 2 further comprising; a dozer implement (7) driven by fluid supplied from said pump (P 1 ), a dozer cylinder (14) to drive said dozer implement (7), and a control valve (V 1 ) provided on a circuit between said pump (P 1 ) and said dozer cylinder (14).
Claim 5
Dependent Claim
88 words
A work vehicle as defined in claim 3 further comprising; a switch valve (V 9 ) connected to the other pump (P 2 ) to supply fluid to a circuit between said valve (V 1 ) and said dozer cylinder (14) to produce confluence, and a check valve (V 9C ) interposed between said switch valve (V 9 ) and said dozer cylinder (14), said check valve (V 9C ) being adapted to prevent fluid flow from said dozer cylinder (14) to said switch valve (V 9 ).
Claim 6
Dependent Claim
20 words
A work vehicle as defined in claim 4 wherein said switch valve (V 9 ) is a rotary type valve.
Claim 7
Dependent Claim
25 words
A work vehicle as defined in claim 5 wherein said control valve (V 1 ) and said switch valve (V 9 ) are operatively connected.
Claim 8
Dependent Claim
37 words
A work vehicle as defined in claim 2 further comprising a bucket driven by fluid supplied from said pump (P 1 ), said actuator (13) for driving said work arm assembly (A) is a cylinder type actuator.
Claim 9
Dependent Claim
29 words
A work vehicle as defined in claim 7 further comprising means for supplementing fluid to a circuit leading to a rod chamber (13a) of said cylinder type actuator (13).
Claim 10
Dependent Claim
64 words
A work vehicle as defined in claim 8 wherein said supplementing means comprises a fluid passage (C) connected to a tank (T) and a check valve (C 1 ) provided on said fluid passage (C), said check valve (C 1 ) is adapted to permit fluid to flow only to said rod chamber (13a) of said actuator (13) for said work arm assembly (A).
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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) | 1982-10-15 | 1983-04-16 | 1983-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-15 | 1987-04-16 | 1987-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-15 | 1991-04-16 | 1991-10-16 | $7700.00 | Window Closed / Lapsed |