US4171054A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Work vehicle with hydraulic circuit for swivel motor and work assembly arm motor
Assignee: Kubota Corp
•
Filing: 1977-12-22
•
Granted: 1979-10-16
•
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 10:48
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).
References Cited (Backward Citations)
US3481251A
Cited
US3922855A
Cited
US4030623A
Cited
US3960284A
Cited
US3978998A
Cited
US4077140A
Cited
US4023364A
Cited
US4078681A
Cited
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 |