Cross country ski
AssigneeAllsop, Inc.
InventorsJames E. Jackson, Denis Wardlow
Life of this patent
Estimating the term…
Abstract
A cross country ski having a bottom running surface with a plurality of grooves formed thereon. Each groove has a central portion extending transversely to the length of the ski and two lateral portions slanting rearwardly and outwardly from the forward portion. Each groove has a surface slanting toward a flat portion coincident with the running surface, in a manner that at any transverse location on the bottom of the ski a portion of the bottom surface is in contact with the surface of the snow.
Claims27
A cross country ski having a front end, a rear end, two side surfaces, a bottom running surface lying generally in a bottom contact plane, a forward to rear longitudinal axis, a transverse axis, and a vertical axis, said ski being characterized in that said bottom surface is formed with a plurality of grooves extending generally transversely across the bottom surface, each groove comprising:
- (a) a middle groove portion extending substantially parallel to the transverse axis;
- (b) two side groove portions extending from said middle portion laterally and outwardly to said side surfaces, with a moderate rearward slant at a substantially constant fixed rearward angle;
- and
- (c) each of said grooves having a forward groove surface portion having a relatively steep vertical alignment component to form a relatively sharp lower forward edge at said bottom surface, and a main surface portion extending from an upper edge portion of said forward groove portion rearwardly at a moderate downward slant to said contact plane.
A cross country ski having a front end, a rear end, two side surfaces, a bottom running surface lying generally in a bottom contact plane, a forward to rear longitudinal axis, a transverse axis, and a vertical axis, and ski comprising:
- (a) a plurality of grooves formed in said bottom surface and extending generally transversely across the bottom surface, each groove comprising:
- (i) a middle groove portion having a substantial alignment component perpendicular to said longitudinal axis;
- (ii) two side groove portions extending from said middle portion laterally and outwardly to said side surfaces, with a moderate rearward slant in a manner that said side groove portions extend to side edges of said ski;
- and
- (iii) each of said grooves having a forward groove surface portion having a relatively steep vertical alignment component to form a relatively sharp lower forward edge at said bottom surface, and a main surface portion extending from an upper edge portion of said forward groove portion rearwardly at a moderate downward slant to said contact plane.
- (b) a plurality of substantially flat intermediate surface portions extending across said bottom surface at said contact plane and positioned alternately with said grooves;
- and
- (c) outer end portions of the forward groove surface portions of each side groove portion terminating at a transverse location rearwardly of a forward middle portion of an adjacent rearwardly positioned intermediate surface portion in a manner that a line drawn transversely across the forward middle portion of the intermediate portion also extends over outer end portions a next forward one of said intermediate portions.
A cross country ski having a front end, a rear end, two side surfaces, a bottom running surface lying generally in a bottom contact plane, a forward to rear longitudinal axis, a transverse axis, and a vertical axis, said ski comprising:
- (a) a plurality of grooves formed in said bottom surface extending generally transversely across the bottom surface, each groove comprising:
- (i) a middle groove portion;
- (ii) two side groove portions extending from said middle portion laterally and outwardly towards said side surfaces, with a moderate rearward slant in a manner that said side groove portions extend to said side edges of said ski;
- and
- (iii) each of said grooves having a forward groove surface portion having a relatively steep vertical alignment component to form a relatively sharp lower forward edge at said bottom surface, and a main surface portion extending from an upper edge portion of said forward groove portion rearwardly at a moderate downward slant to said contact plane.
- (b) a plurality of substantially flat intermediate portions extending across said bottom surface at said contact plane and positioned alternately with said grooves;
- and
- (c) said intermediate surface portions having a total surface area greater than a surface area of said grooves, with a lengthwise dimension of each of said intermediate portions parallel to said longitudinal axis being greater than a lengthwise dimension of each of said grooves.
Dependencies are inferred from the claim text.