US3712404A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hillside tractor
Assignee: SHUR FOOT TRACTOR CO
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Filing: 1970-12-11
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Granted: 1973-01-23
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Expires: 1990-12-11
Abstract
Abstract A hillside tractor is provided capable of maintaining the engine and operator''s platform level while the tractor travels along the sides of hills, for mowing the hillsides or doing other work. The tractor is hydraulically driven by pumps powered by an internal combustion engine. The frame of the device comprises an elongated large diameter tubular member which functions as a chassis and also as a hydraulic fluid reservoir.
Inventors
- 👤 K Walquist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:44
CPC Classifications
B; B62; B62D; B62D49/00; B62D49/08; B60; B60K; B60K17/00; B60K17/04; B60K17/10; B62D61/00; B62D61/12; Y; Y10; Y10S; Y10S37/00; Y10S37/907
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
191 words
A hillside tractor including: an elongated tubular member extending from front to rear along the longitudinal center-line of said tractor and forming the main support, a wheel supporting one end of said tubular member and pivotally supported upon a wheel supporting member, said wheel supporting member being connected to said tubular member along a substantially vertical axis, a pair of wheel supporting arms pivotally supported on a common axis on opposite sides and intermediate said tubular member, said common axis extending generally transverse to said tubular member, said supporting arms extending lengthwise of the tubular member from the pivot points, wheels supported on said arms on axes parallel to, and spaced equidistant from, said common axis, means connecting said arms for simultaneously pivoting one arm upwardly and the other arm downwardly, hydraulic pump means supported by said tubular member, drive means supported by said tubular member and connected to said pump means to drive the same, hydraulic drive motors connected to said wheels to drive the same, and connected to said pumps to receive fluid therefrom, and said tubular member serving as a reservoir for hydraulic fluid pumped by said pumps.
Claim 2
Dependent Claim
191 words
A hillside tractor including: an elongated tubular member extending from front to rear along the longitudinal center-line of said tractor and forming the main support, a wheel supporting one end of said tubular member and pivotally supported upon a wheel supporting member, said wheel supporting member being connected to said tubular member along a substantially vertical axis, a pair of wheel supporting arms pivotally supported on a common axis on opposite sides and intermediate said tubular member, said common axis extending generally transverse to said tubular member, said supporting arms extending lengthwise of the tubular member from the pivot points, wheels supported on said arms on axes parallel to, and spaced equidistant from, said common axis, means connecting said arms for simultaneously pivoting one arm upwardly and the other arm downwardly, hydraulic pump means supported by said tubular member, drive means supported by said tubular member and connected to said pump means to drive the same, hydraulic drive motors connected to said wheels to drive the same, and connected to said pumps to receive fluid therefrom, and said tubular member serving as a reservoir for hydraulic fluid pumped by said pumps.
Claim 3
Dependent Claim
30 words
The structure of claim 1 and in which an end of said tubular member inclines upwardly to support a steering platform to which said first mentioned wheel is pivotally connected.
Claim 4
Dependent Claim
16 words
The structure of claim 1 and in which said drive means comprises an internal combustion engine.
Claim 5
Dependent Claim
26 words
The structure of claim 1 and in which said last named wheels are supported on axles extending outwardly in opposed relation from said wheel supporting arms.
Claim 6
Dependent Claim
29 words
The structure of claim 1 and in which said pumps and said drive means are substantially centered relative to a vertical plane through the axis of said tubular member.
Claim 7
Dependent Claim
43 words
The structure of claim 1 and in which said means connecting said arms is hydraulically operated by said hydraulic pump means, and in which said means connecting said arms is held from movement in the absence of hydraulic fluid from said pump means.
Claim 8
Dependent Claim
16 words
The structure of claim 1 and in which said pump means includes a series of pumps.
Claim 9
Dependent Claim
42 words
The structure of claim 7 and in which said series of pumps include two pumps of different capacity, and control means for selectively connecting the output of either or both of said two pumps to said hydraulic motors to drive the same.
Claim 10
Dependent Claim
81 words
The structure of claim 7 and including a hydrauliC power take-off motor and including two pumps of said series are of different capacity, and control means for selectively connecting the output of either or both of said two pumps to said hydraulic drive motors to drive the same, and a third pump in said series, and means selectively connecting said third pump to said power take-off motor or to said drive motors to supplement the fluid flowing from said two pumps.
References Cited (Backward Citations)
US689001A
Cited
US3008724A
Cited
US3261421A
Cited
US3250340A
Cited
US3182444A
Cited
US3309097A
Cited
US3370666A
Cited
US3442526A
Cited
US3519097A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |