| US 7,543,401 B2 | ||
| Back drag plow | ||
| Doug Hughes, 1470 Sunset Dr. SW., Owatonna, Minn. 55060 (US) | ||
| Assigned to Doug Hughes, Owatonna, Minn. (US) | ||
| Filed on Aug. 17, 2007, as Appl. No. 11/893,959. | ||
| Prior Publication US 2009/0044433 A1, Feb. 19, 2009 | ||
| Int. Cl. E01H 5/06 (2006.01) | ||
| U.S. Cl. 37—232 [37/268; 37/903; 37/233] | 32 Claims |
| 1. A plow comprising:
an upper blade;
a lower forward-plowing blade coupled to the upper blade, the lower forward-plowing blade configured to engage material to
be plowed when the plow is plowing in a forward direction; and
a back-blade pivotally coupled to the upper blade and elastically coupled to the upper blade, the back-blade configured to
engage material to be plowed when the plow is plowing in a reverse direction opposite the forward direction;
wherein the elastic coupling exerts a biasing force on the back-blade that acts to bias the back-blade in a non-operative
position at which the back-blade is pivoted away from the lower forward-plowing blade toward the reverse direction.
|