Patent ID: 8789658

Claim:
A traction device comprising: a cross section defining a plane; a plurality of tension members each having a first diameter (d 1 ); an elastomer material configured as a jacketing of said tension members so as to form a plurality of jacketed tension members; said jacketed tension members having respective outer surfaces and being arranged one adjacent the other in said plane of said cross section and said jacketed tension members each having a second diameter (d 2 ); said jacketed tension members having a back side and a front side and being arranged so as to define a clear space between each two mutually adjacent ones of said jacketed tension members; a back layer connecting said jacketed tension members together at said back side of said jacketed tension members; said jacketed tension members having respective center points conjointly defining a center line; said jacketed tension members being all of like configuration below said center line and said clear spaces extending from said front side of said jacketed tension members and to beyond said center line toward said back side; said second diameter (d 2 ) of said jacketed tension members having a ratio to said first diameter (d 1 ) of said tension members between 1.2 and 1.6; and, said ratio (d 2 /d 1 ) being constant up to said center line whereat said outer surfaces intersect said center line and whereat respective tangents drawn to said outer surfaces are perpendicular to said center line and are mutually parallel.