Patent US4186820A successfully refreshed from Google Patents.
Patent US3789929A successfully refreshed from Google Patents.
US3789929A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Three wheel all wheel hydraulic drive tractor
Assignee: Individual
•
Filing: 1972-03-29
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Granted: 1974-02-05
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Expires: 1992-03-29
Abstract
Abstract A three wheel all wheel hydraulic drive tractor in which the single wheel is steerable and all wheels tilt about a longitudinal axis for maintaining the stability of the tractor. A bulldozer blade and a grader blade are each fixed to the tractor for vertical and tilting adjustment as well as transverse tilting adjustment. All adjustments are hydraulically made and an internal combustion engine drives a hydraulic pump to power the adjusting cylinders and the hydraulic power motors. The power motors are mounted within each of the wheels within the rim thereof.
Inventors
- 👤 R Leidig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:59
CPC Classifications
E; E02; E02F; E02F9/00; E02F9/02; B; B62; B62D; B62D49/00; B62D49/04; B62D61/00; B62D61/06; B62D61/08; E02F3/00; E02F3/04; E02F3/76; E02F3/7609; E02F3/7618; E02F3/7636; E02F3/7645
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
210 words
A three wheel tractor including a generally horizontal frame, an upwardly offset front frame rigidly secured to the front portion of said horizontal frame, a pair of wheels secured to support the rear portion of said horizontal frame, a generally rectangular normally horizontal front wheel frame, a single wheel encompassed by said front wheel frame and journalled therein, means connecting said front wheel frame to said front frame for supporting said horizontal frame, said last named means connecting said front wheel frame for; tilting adjustment about a horizontal longitudinal pivot and for; steering rotation about a vertical pivot, power means on said means connecting said front wheel frame to said front frame for tilting said front wheel frame, power means on said front frame for rotating said front wheel frame for steering said tractor, means mounting said rear wheels for tilting movement about a horizontal longitudinal pivot, a hydraulic motor contained within each of said wheels for rotating said wheels, a grader blade mounted on said tractor intermediate the opposite ends thereof, and means on said tractor for pivoting said grader blade about a vertical axis and additional means on said grader blade for pivoting said grader blade about a horizontal axis to control the grading position of said blade.
Claim 2
Dependent Claim
210 words
A three wheel tractor including a generally horizontal frame, an upwardly offset front frame rigidly secured to the front portion of said horizontal frame, a pair of wheels secured to support the rear portion of said horizontal frame, a generally rectangular normally horizontal front wheel frame, a single wheel encompassed by said front wheel frame and journalled therein, means connecting said front wheel frame to said front frame for supporting said horizontal frame, said last named means connecting said front wheel frame for; tilting adjustment about a horizontal longitudinal pivot and for; steering rotation about a vertical pivot, power means on said means connecting said front wheel frame to said front frame for tilting said front wheel frame, power means on said front frame for rotating said front wheel frame for steering said tractor, means mounting said rear wheels for tilting movement about a horizontal longitudinal pivot, a hydraulic motor contained within each of said wheels for rotating said wheels, a grader blade mounted on said tractor intermediate the opposite ends thereof, and means on said tractor for pivoting said grader blade about a vertical axis and additional means on said grader blade for pivoting said grader blade about a horizontal axis to control the grading position of said blade.
Claim 3
Dependent Claim
19 words
A device as claimed in claim 1 including power means on said horizontal frame for tilting said rear wheels.
References Cited (Backward Citations)
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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) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |