Patent US4519465A successfully refreshed from Google Patents.
US4519465A
Expired / Lapsed
US
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Track type four sprocket wheel drive crawler tractor
Assignee: Individual
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Filing: 1982-03-26
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Granted: 1985-05-28
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Expires: 2002-03-26
Abstract
Abstract A crawler tractor using hydraulic pumps and motors for propulsion. One hydraulic pump operates fore and aft hydraulic motors on the same side of the tractor. Two cross members are used to join the undercarriage to the cab. The two cross members are replaceable with other cross members to change the width between the tracks and to change ground clearance of the cab. Single screwable means adjust the length of the undercarriage.
Inventors
- 👤 Richard A. Triplett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:26
CPC Classifications
B; B62; B62D; B62D55/00; B62D55/08; B62D55/084; B62D55/30
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
78 words
A four wheel sprocket drive crawler tractor comprising: a. A cab; b. an undercarriage; c. cross members; and d. means for propulsion with means for equalizing hydraulic fluid flow through a hydraulic pump and a fore and aft hydraulic motor, with one hydraulic pump connecting to fore and aft hydraulic motor on one side of the tractor, and with one other hydraulic pump connecting to another fore and aft hydraulic motor on the other side of the tractor.
Claim 2
Dependent Claim
78 words
A four wheel sprocket drive crawler tractor comprising: a. A cab; b. an undercarriage; c. cross members; and d. means for propulsion with means for equalizing hydraulic fluid flow through a hydraulic pump and a fore and aft hydraulic motor, with one hydraulic pump connecting to fore and aft hydraulic motor on one side of the tractor, and with one other hydraulic pump connecting to another fore and aft hydraulic motor on the other side of the tractor.
Claim 3
Dependent Claim
66 words
A four wheel sprocket drive crawler tractor of claim 1 wherein said means for equalizing hydraulic fluid flow through a hydraulic pump and a fore and an aft hydraulic motor comprise connecting the hydraulic pump to fore and aft hydraulic motors on the same side of the tractor where said hydraulic motors are connected first to sprockets which are in turn interconnected to the same track.
Claim 4
Dependent Claim
37 words
A four wheel sprocket drive crawler tractor of claim 1 wherein said means for changing the length of the undercarriage comprises slideable mounts attached slideably to forks and adjustable by single screwable means to a roller unit.
Claim 5
Dependent Claim
25 words
A four wheel sprocket drive crawler tractor of claim 1 wherein said cross members are replaceable removeably with cross members of increased or decreased length.
Claim 6
Dependent Claim
28 words
A four wheel sprocket drive crawler tractor of claim 1 wherein said cross members are removeably replaceable by cross members of increased or decreased height of end attachment.
Claim 7
Dependent Claim
22 words
A four wheel sproket drive crawler tractor of claim 1 where the cab and undercarriage are joined together by two cross members.
References Cited (Backward Citations)
US1079164A
Cited
US3082044A
Cited
US3154164A
Cited
US3385255A
Cited
US3494439A
Cited
US3710886A
Cited
US3865208A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-05-27 | 1988-11-26 | 1989-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-27 | 1992-11-26 | 1993-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-27 | 1996-11-26 | 1997-05-28 | $7700.00 | Window Closed / Lapsed |