Snowplow blade lifting mechanism

Excavating – Snow or ice removing or grooming by portable device – Vehicle mount including power lift

Reexamination Certificate

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Details

C037S266000

Reexamination Certificate

active

07028423

ABSTRACT:
The blade lifting mechanism includes a counterbalance offsetting the weight of the snowplow blade assembly and enabling the double-acting actuator to position the blade much more easily. IN a first embodiment, heavy duty download pressure springs in conjunction with a toggle link enable the downward force on the blade to be varied between a value which is a fraction of the weight of the blade to an amount which is several multiples of the magnitude of the weight of the blade assembly. In a second embodiment, the toggle link is replaced by a linear slide link.

REFERENCES:
patent: 1385153 (1921-01-01), Clark
patent: 1776788 (1930-09-01), Gettelman
patent: 2094515 (1937-09-01), Abbe
patent: 2302516 (1942-11-01), Ball
patent: 4947563 (1990-08-01), Pfister, Jr.
patent: 5044098 (1991-09-01), Berghefer
patent: 5920477 (1999-07-01), Hoffberg et al.
patent: 6088937 (2000-07-01), DiClementi et al.
patent: 6581306 (2003-06-01), DiClementi et al.
patent: 6711837 (2004-03-01), Bloxdorf et al.
patent: 6892480 (2005-05-01), Gledhill et al.

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