Patent US3795068A successfully refreshed from Google Patents.
US3795068A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Snow plow
Assignee: SCHMIDT A FA
•
Filing: 1972-02-23
•
Granted: 1974-03-05
•
Expires: 1992-02-23
Abstract
Abstract A snow plow has snow propeller drum structure driven by hydraulic motor means disposed inside this propeller drum structure. Advantageously, several hydraulic motors drive two symmetrical sections of a drum by a common gear and shaft means within the drum structure.
Inventors
- 👤 G Brunner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:07
CPC Classifications
E; E01; E01H; E01H5/00; E01H5/04; E01H5/08; E01H5/09; E01H5/098; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19014
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
123 words
A snow plow structure comprising: a. at least one pair of snow plow drums coaxially juxtaposed to and closely spaced from one another; b. a rigid support structure for said drums, comprising a plate generally vertically extending between the drums of said pair; c. drive means for the drums, disposed within the drums and comprising a drive shaft common to and centrally disposed within the aforesaid drums; a rotor for driving said shaft, adjacent said plate; and a plurality of hydraulic motors distributed in the space within the drums for driving said rotor; and d. valve means for controllably and selectively connecting said hydraulic motors to a source of drive energy outside the drums, said valve means being operatively connected to said motors.
Claim 2
Dependent Claim
123 words
A snow plow structure comprising: a. at least one pair of snow plow drums coaxially juxtaposed to and closely spaced from one another; b. a rigid support structure for said drums, comprising a plate generally vertically extending between the drums of said pair; c. drive means for the drums, disposed within the drums and comprising a drive shaft common to and centrally disposed within the aforesaid drums; a rotor for driving said shaft, adjacent said plate; and a plurality of hydraulic motors distributed in the space within the drums for driving said rotor; and d. valve means for controllably and selectively connecting said hydraulic motors to a source of drive energy outside the drums, said valve means being operatively connected to said motors.
Claim 3
Dependent Claim
55 words
A snow plow structure according to claim 1, wherein said support structure includes a hollow axle for each drum, said axle being rigid with said plate, being concentrically disposed within the drum and having one part of said drive shaft centrally disposed therein and connected to the drum at the outer end of the shaft.
Claim 4
Dependent Claim
41 words
A snow plow structure according to claim 1, wherein the rotor of said drive means is a gear having said shaft rigidly connected thereto; every one of said plurality of hydraulic motors having a drive pinion in mesh with said gear.
References Cited (Backward Citations)
US1725487A
Cited
US2463349A
Cited
US2868305A
Cited
US3021620A
Cited
US3214998A
Cited
US3166952A
Cited
US3398470A
Cited
US3468041A
Cited
US3503450A
Cited
AT278894B
Cited
US3566714A
Cited
US3613336A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-04 | 1977-09-03 | 1978-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-04 | 1981-09-03 | 1982-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-04 | 1985-09-03 | 1986-03-05 | $7700.00 | Window Closed / Lapsed |