US4897942A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High efficiency snowthrower
Assignee: Simplicity Manufacturing Inc
•
Filing: 1988-10-14
•
Granted: 1990-02-06
•
Expires: 2008-10-14
Abstract
Abstract A snow removal apparatus operable in a substantially optimum efficiency state using a variable ratio pulley. The snow removal apparatus includes a feature for sensing power demand made on the snowthrower under variable snow conditions. Responsive to the power demand, the fan speed and/or auger speed is reduced or increased in order to use the full engine power without stalling the engine.
Inventors
- 👤 Kenneth H. Klas
- 👤 Richard R. Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:00
CPC Classifications
E; E01; E01H; E01H5/00; E01H5/04; E01H5/045; E01H5/08; E01H5/09; E01H5/098; F; F16; F16H; F16H61/00; F16H61/66; F16H61/662; F16H61/6625
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
85 words
A snow removal apparatus, comprising: an engine; means for engaging and displacing accumulated snow; and means for coupling said engine to said engaging and displacing means so as to maintain a substantially constant load on said engine and while said engine operates at said constant load said coupling means transmits the power from said engine to said displacement means to achieve maximum snowthrowing distance for the engaged snow depending on the weight and depth of the accumulated snow encountered by said engaging and displacing means.
Claim 2
Dependent Claim
85 words
A snow removal apparatus, comprising: an engine; means for engaging and displacing accumulated snow; and means for coupling said engine to said engaging and displacing means so as to maintain a substantially constant load on said engine and while said engine operates at said constant load said coupling means transmits the power from said engine to said displacement means to achieve maximum snowthrowing distance for the engaged snow depending on the weight and depth of the accumulated snow encountered by said engaging and displacing means.
Claim 3
Dependent Claim
90 words
A snow removal apparatus, comprising: an engine adapted to provide power for operation of said snow apparatus; rotating means driven by said engine for moving accumulated snow; and means for coupling said engine to said rotating means for moving snow, said coupling means including sensing means for measuring the power demand made on said engine for changing the operational rate of said rotating means to maximize snowthrowing distance and adjusting means for maintaining the maximum horsepower output without stalling of said engine responsive to the output from said sensing means.
Claim 4
Dependent Claim
90 words
A snow removal apparatus, comprising: an engine adapted to provide power for operation of said snow apparatus; rotating means driven by said engine for moving accumulated snow; and means for coupling said engine to said rotating means for moving snow, said coupling means including sensing means for measuring the power demand made on said engine for changing the operational rate of said rotating means to maximize snowthrowing distance and adjusting means for maintaining the maximum horsepower output without stalling of said engine responsive to the output from said sensing means.
References Cited (Backward Citations)
US31361A
Cited
US2994228A
Cited
US3393572A
Cited
US3383927A
Cited
US3504560A
Cited
US3771377A
Cited
US4023635A
Cited
US4088036A
Cited
SU628215A1
Cited
SU699081A1
Cited
US4289214A
Cited
GB1603853A
Cited
USRE31361E
Cited
US4350491A
Cited
US4348197A
Cited
US4458559A
Cited
US4571216A
Cited
EP0096758A2
Cited
US4504247A
Cited
US4605386A
Cited
US4689036A
Cited
US4783915A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-05 | 1993-08-07 | 1994-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-05 | 1997-08-07 | 1998-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-05 | 2001-08-07 | 2002-02-06 | $7700.00 | Window Closed / Lapsed |