US 9,809,932 B2
Traction device
Ernest J. Delanghe, Burnsville, MN (US); and Paul Dathe, Plymouth, MN (US)
Assigned to Caliber, Inc., Burnsville, MN (US)
Filed by Caliber, Inc., Burnsville, MN (US)
Filed on May 8, 2015, as Appl. No. 14/707,483.
Claims priority of provisional application 61/990,446, filed on May 8, 2014.
Prior Publication US 2015/0367682 A1, Dec. 24, 2015
Int. Cl. B60B 39/12 (2006.01); E01B 23/00 (2006.01)
CPC E01B 23/00 (2013.01) [B60B 39/12 (2013.01)] 26 Claims
OG exemplary drawing
 
1. A traction device configured to engage a track of a snowmobile as the snowmobile moves in a direction of travel, comprising:
a plurality of spaced apart longitudinal ribs substantially aligned with the direction of travel and a plurality of spaced apart transverse ribs that interconnect the plurality of spaced apart longitudinal ribs, a first longitudinal rib of the plurality of spaced apart longitudinal ribs having a plurality of first raised gripping elements spaced apart to engage a track having lugs spaced at a first pitch and a second longitudinal rib of the plurality of spaced apart longitudinal ribs having a plurality of second raised gripping elements spaced apart to engage a track having lugs spaced at a second pitch and a plurality of third raised gripping elements across a width of each of the plurality of transverse ribs, wherein the transverse ribs are spaced to engage a track having lugs spaced at a third pitch wherein the first pitch is 2.86 inches, wherein the second pitch is 3.0 inches, and wherein the third pitch is 2.52 inches.