Self-propelled snowplow vehicle
US6705028B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 10, 2002 |
| Grant date | Mar 16, 2004 |
| Priority date | — |
| Expiry date | Sep 10, 2022 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE01H5/04
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A self-propelled snowplow vehicle includes a vehicle frame equipped with an auger at a front end portion thereof and pivotally connected to a propelling frame equipped with driving wheels, and a frame lift mechanism for lifting the front end portion of the vehicle frame up and down relative to the propelling frame. The frame lift mechanism comprises an electro-hydraulic cylinder actuator having a piston rod and an electric motor rotatably driven to produce a fluid pressure for reciprocating the piston rod in response to operation of a manual operating switch. The snowplow vehicle also includes a control unit arranged to forcibly stop the electric motor when a predetermined time has elapsed after the operation switch is activated, the predetermined time being equal to an operating time of the cylinder actuator which is required to extend or contract the piston rod over a maximum stroke defined between a fully extended position and a fully contracted position of the piston rod.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.