Patent US3755930A successfully refreshed from Google Patents.
US3755930A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Snow grader
Assignee: Individual
•
Filing: 1970-12-18
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Granted: 1973-09-04
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Expires: 1990-12-18
Abstract
Abstract A snow grader including a frame and a blade thereon, the frame being pivotally connected at a single point behind a towing vehicle, on both transverse and vertical axes so that the grader trails free; the blade is angled for moving the snow laterally, this producing a lateral reaction, and its leading end is tilted down, and because, in this position, the leading end is moving more snow than the trailing end, a reaction force is developed which counteracts the lateral reaction; as a consequence the frame, with the blade, follows straight behind the towing vehicle; the device also includes manually operated means for controlling the positioning of the blade.
Inventors
- 👤 C Brandt
- 👤 P Brandt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:23
CPC Classifications
E; E01; E01H; E01H5/00; E01H5/04; E01H5/06; E01H5/068; E02; E02F; E02F3/00; E02F3/04; E02F3/76; E02F3/7663; E02F3/7668; E02F3/7677
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
210 words
A snow grader comprising, a single main frame, centrally located, longitudinally elongated, and narrow, connector means on the front end of the main frame operative, when secured to a towing vehicle, for forming a connection for universal movement of the snow grader relative to the towing vehicle about an effectively single point, enabling relatively free trailing movement of the snow grader following that point, and forming the sole connection between the snow grader and the towing vehicle, a compactor bar secured to the main frame adjacent the rear end of the latter, of transverse dimension substantially greater than the main frame, and resting on the snow and constituting the sole means for supporting the snow grader except said connector means, the compactor bar having a broad-area bottom surface extending its full transverse dimension and extending a substantial extent longitudinally of the snow grader, and riding on top of the snow without tendency to guide the snow grader laterally or to displace the snow on which it rides, when the snow grader is towed, a blade mounted on the main frame extending generally transversely thereof and of substantial transverse dimension, and means for adjustably positioning the blade angularly about a vertical axis, and also angulary about a longitudinal, generally horizontal axis.
Claim 2
Dependent Claim
210 words
A snow grader comprising, a single main frame, centrally located, longitudinally elongated, and narrow, connector means on the front end of the main frame operative, when secured to a towing vehicle, for forming a connection for universal movement of the snow grader relative to the towing vehicle about an effectively single point, enabling relatively free trailing movement of the snow grader following that point, and forming the sole connection between the snow grader and the towing vehicle, a compactor bar secured to the main frame adjacent the rear end of the latter, of transverse dimension substantially greater than the main frame, and resting on the snow and constituting the sole means for supporting the snow grader except said connector means, the compactor bar having a broad-area bottom surface extending its full transverse dimension and extending a substantial extent longitudinally of the snow grader, and riding on top of the snow without tendency to guide the snow grader laterally or to displace the snow on which it rides, when the snow grader is towed, a blade mounted on the main frame extending generally transversely thereof and of substantial transverse dimension, and means for adjustably positioning the blade angularly about a vertical axis, and also angulary about a longitudinal, generally horizontal axis.
Claim 3
Dependent Claim
24 words
A snow grader according to claim 1, wherein the blade extends transversely through a range similar to the transverse dimension of a compactor bar.
Claim 4
Dependent Claim
29 words
A snow grader according to claim 2 wherein the compactor bar is rigid with the main frame, and serves to stabilize the entire snow grader about said longitudinal axis.
Claim 5
Dependent Claim
78 words
A snow grader according to claim 1, wherein the blade is angled relative to a vertical axis to a position in which it is at an acute angle to the direction of movement of the grader, forming a leading end and a trailing end of the blade, and wherein the blade is also angled relative to a longitudinal, generally horizontal axis to a position in which the leading end of the blade is lower than the trailing end.
Claim 6
Dependent Claim
17 words
A snow grader according to claim 4 and including means operative for vertically adjusting the blade bodily.
Claim 7
Dependent Claim
38 words
A snow grader according to claim 1 wherein the compactor bar is at the extreme rear end of the main frame, and the blade is mounted on the main frame at a position forwardly of the compactor bar.
Claim 8
Dependent Claim
32 words
A snow grader according to claim 1 in conjunction with said towing vehicle, and wherein the snow grader is secured to the towing vehicle in the manner referred to in claim 1.
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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) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |