US3661215A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tilting dozer blade
Assignee: Massey Ferguson Services NV
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Filing: 1970-01-29
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Granted: 1972-05-09
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Expires: 1990-01-29
Abstract
Abstract A bulldozer construction for a tractor comprises a dozer blade extending across the front of the tractor, a pair of strut assemblies each connected at one end to receive a thrust from the blade and to transmit it to the tractor. Each assembly includes a strut of fixed length and a sub-assembly of variable length and hydraulic actuators operable by the tractor driver without dismounting from the tractor, to vary the effective length of the two sub-assemblies in unison to give a pitching movement to the blade. The actuators are also operable to vary the effective length differentially to give a tilting movement to the blade.
Inventors
- 👤 Pietro Pensa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:17
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/76; E02F3/80; E02F3/84; E02F3/844
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
125 words
Bulldozer structure for a tractor comprising a blade extending across the front of the tractor, a pair of strut assemblies each connected at one end to said blade to receive a thrust from said blade and having opposite ends adapted for connection to a tractor for transmitting said thrust to said tractor, each of said assemblies consisting of a strut of fixed length and a sub-assembly of variable length, and power actuating means operable by a tractor, to simultaneously increase or decrease the effective length of the two sub-assemblies to give a pitching movement to the blade, said means also being operable to increase the length of one sub-assembly and decrease the length of the other sub-assembly to give a tilting movement to the blade.
Claim 2
Dependent Claim
125 words
Bulldozer structure for a tractor comprising a blade extending across the front of the tractor, a pair of strut assemblies each connected at one end to said blade to receive a thrust from said blade and having opposite ends adapted for connection to a tractor for transmitting said thrust to said tractor, each of said assemblies consisting of a strut of fixed length and a sub-assembly of variable length, and power actuating means operable by a tractor, to simultaneously increase or decrease the effective length of the two sub-assemblies to give a pitching movement to the blade, said means also being operable to increase the length of one sub-assembly and decrease the length of the other sub-assembly to give a tilting movement to the blade.
Claim 3
Dependent Claim
66 words
Bulldozer structure according to claim 1 characterized in that each sub-assembly consists of a first link pivotally connected at one end of the strut and a second link pivotally connected at one end to the first link and at the other end through a transversely movable pivot to the blade, and guide means to maintain substantially the positional relationship between the first link and the strut.
Claim 4
Dependent Claim
61 words
Bulldozer structure according to claim 2 characterized in that the control means to vary the effective lengths of the sub-assemblies consists in part of a pair of double acting piston and cylinder rams containing four fluid chambers two of which are permanently connected together to form a common chamber, the ram pistons or cylinders being connected to move the movable pivots.
Claim 5
Dependent Claim
62 words
Bulldozer structure according to claim 3 characterized in that the piston rods are connected to the movable pivots and a control located near to the driver is provided to direct pressure fluid to the common chamber to cause the pistons to move the movable pivots so that both sub-assemblies are extended or contracted by an equal amount to give a pitching movement.
Claim 6
Dependent Claim
53 words
Bulldozer structure according to claim 4 characterized in that the control system includes means to close the common chamber and direct pressure fluid to one of the other chambers to cause both pistons to move their respective movable pivots so that one sub-assembly is extended while the other is contracted or vice versa.
References Cited (Backward Citations)
US2224725A
Cited
US2766536A
Cited
US3049820A
Cited
US3061955A
Cited
US3477151A
Cited
US3441092A
Cited
US3513916A
Cited
US3503457A
Cited
US3529678A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |