Patent ID: 7264250

Claim:
A self sharpening runner ( 28 ) meant to be fixed to a slide ski face, said self sharpening runner comprising: a rectangular wear blade runner ( 28 ) having a high short side ( 29 ) upwardly oriented against said slide ski face, two long large sides ( 31 ) disposed perpendicularly to said slide ski face and a low short side ( 29 ′) downward oriented facing the ground, said large ( 31 ) and short ( 29 ) sides defining a support ( 40 ), said low short side ( 29 ′) of said support comprising a sheath ( 32 ), said support having a first hardness; said sheath ( 32 ) having two parallel sides disposed from said low side ( 29 ′) to a depth ( 44 ), said sheath receiving a blade ( 30 ) having an excess ( 41 ) below said low side ( 29 ′) and having a second hardness of higher magnitude than said first hardness so when said self sharpening runner travels on a hard surface as asphalt or ice, only said blade ( 30 ) is in contact and exposed to wearing out, but when said self sharpening runner travels on a penetrable surface, as snow blend with salt, sand, or gravel, both, said blade ( 30 ) and said support ( 40 ), penetrate said surface and become exposed to abrasion; successive passage of said sliding ski face on a hard and abrasive surface as asphalt roads causing partial abrasion of said runner blade ( 30 ) and the passage of said sliding ski face on abrasive matter less harder causing penetration of said blade and of said support ( 40 ) and the wearing out of said blade and of said support in inverse proportion of their respective hardness, said excess ( 41 ) corresponding to an efficient cut in said hard matter being maintained until complete wearing out of said blade when a ratio of said first hardness compared to said second hardness is chosen for successive passages on hard abrasive surface and penetrable surface, completing a self sharpening and a constant and even cut until complete wearing out.