Patent US3631931A successfully refreshed from Google Patents.
US3631931A
Expired / Lapsed
US
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Bulldozer
Assignee: Case LLC
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Filing: 1969-12-12
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Granted: 1972-01-04
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Expires: 1989-12-12
Abstract
Abstract A bulldozer having pivotally mounted on the front end an Ashaped push frame which swivelly supports a dozer blade. The angle, pitch and tilt of the blade is adjusted by upper and lower parallel jacks on each side of the bulldozer. The blade is raised and lowered by another jack that interconnects the middle of the push frame with the front of the tractor.
Inventors
- 👤 Claude M Frisbee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:52
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/76; E02F3/7609; E02F3/7618; E02F3/7613
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
245 words
In combination with a motor, a dozer blade, an A-shaped frame having one end thereof pivotably connected to the front end of the vehicle and an opposite end thereof swivelly connected to the dozer blade, a lift jack having one end thereof connected to the upper front end of the vehicle and an opposite end thereof connected to approximately the middle of the A-frame and operative to raise and lower the A-frame and correspondingly the dozer blade, power-operated means for selectively maneuvering the dozer blade, the power-operated means including a pair of doubleacting fluid-operated upper and lower jacks arranged in substantially parallel relationship on each side of the vehicle, the uPper and lower jacks each having universal connections at the opposite ends with the front end of the vehicle and the ends of the dozer blade, with the pivotable connection between said one end of said A-shaped frame and the vehicle being coaxial with the transverse axis through the universal connections between the vehicle and both upper jacks or both lower jacks, so that the blade is pitched forward or backward when the upper jacks on each side of the vehicle are respectively extended or retracted, the blade is tilted when one of the upper jacks is extended and the other upper jack is retracted and the blade is angled when both the upper and lower jacks on one side are extended and the upper and lower jacks on the opposite side are both retracted.
Claim 2
Dependent Claim
245 words
In combination with a motor, a dozer blade, an A-shaped frame having one end thereof pivotably connected to the front end of the vehicle and an opposite end thereof swivelly connected to the dozer blade, a lift jack having one end thereof connected to the upper front end of the vehicle and an opposite end thereof connected to approximately the middle of the A-frame and operative to raise and lower the A-frame and correspondingly the dozer blade, power-operated means for selectively maneuvering the dozer blade, the power-operated means including a pair of doubleacting fluid-operated upper and lower jacks arranged in substantially parallel relationship on each side of the vehicle, the uPper and lower jacks each having universal connections at the opposite ends with the front end of the vehicle and the ends of the dozer blade, with the pivotable connection between said one end of said A-shaped frame and the vehicle being coaxial with the transverse axis through the universal connections between the vehicle and both upper jacks or both lower jacks, so that the blade is pitched forward or backward when the upper jacks on each side of the vehicle are respectively extended or retracted, the blade is tilted when one of the upper jacks is extended and the other upper jack is retracted and the blade is angled when both the upper and lower jacks on one side are extended and the upper and lower jacks on the opposite side are both retracted.
Claim 3
Dependent Claim
201 words
In combination with a vehicle, an implement, a push frame having one end thereof pivotably connected to the front end of the vehicle for movement about an axis transverse the the longitudinal axis of the vehicle and the opposite end thereof having a ball socket connection with the implement so that the implement is swivelable relative to the frame, means for selectively maneuvering the implement relative to the frame, the maneuvering means including a pair of substantially parallel upper and lower retractable and extensible strut members on each side of the vehicle, each strut member having its opposite ends universally connected respectively to the vehicle and to the implement, with the pivotable connection between said one end of the push frame and the vehicle being coaxial with the transverse axis through the universal connections between the vehicle and both upper struts or both lower struts, the maneuvering means further including a lift jack having one end thereof connected to the upper front end of the vehicle and the opposite end thereof connected to approximately the middle part of the push frame and operative to raise and lower the frame and correspondingly the implement relative to the front end of the vehicle.
Claim 4
Dependent Claim
201 words
In combination with a vehicle, an implement, a push frame having one end thereof pivotably connected to the front end of the vehicle for movement about an axis transverse the the longitudinal axis of the vehicle and the opposite end thereof having a ball socket connection with the implement so that the implement is swivelable relative to the frame, means for selectively maneuvering the implement relative to the frame, the maneuvering means including a pair of substantially parallel upper and lower retractable and extensible strut members on each side of the vehicle, each strut member having its opposite ends universally connected respectively to the vehicle and to the implement, with the pivotable connection between said one end of the push frame and the vehicle being coaxial with the transverse axis through the universal connections between the vehicle and both upper struts or both lower struts, the maneuvering means further including a lift jack having one end thereof connected to the upper front end of the vehicle and the opposite end thereof connected to approximately the middle part of the push frame and operative to raise and lower the frame and correspondingly the implement relative to the front end of the vehicle.
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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) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |