# US 4,392,658 A · Skate blade > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,392,658 A - Document ID: US4392658A - Status: Granted - Kind: A - Application number: 06/213,228 - Filed: 1980-12-05 - Granted: 1983-07-12 - Earliest claimed: 1980-12-05 - Assignees: Norjay Services, Ltd. - Inventors: Harry W. Redmond; Raymond V. Jeannotte - Web page: https://patentgrep.com/patent/US4392658A ## CPC - A63C 1/32: Special constructions of the simple blade - A63C 1/30: with special blades - A63C: SKATES; SKIS; ROLLER SKATES; DESIGN OR LAYOUT OF COURTS, RINKS OR THE LIKE (water skis B63B32/00, B63B34/00) ## Abstract An elongated skate blade for an ice skate, the blade including first and second acute-angled cutting edges formed longitudinally on opposed sides of the blade for cutting engagement with an ice surface, and a generally downwardly facing longitudinally extending bottom surface extending transversely from the first cutting edge to the second cutting edge. The bottom surface includes first and second longitudinally extending edge faces rising upwardly and inwardly from the first and second cutting edges respectively, and a longitudinally extending middle face centrally disposed between the first and second edge faces. The middle face has a substantially flat or downwardly convex profile in transverse cross-section for at least one-third of the distance from the transverse center of the blade to each side of the blade. Where the middle face is downwardly convex, the radius of curvature exceeds the width of the blade for at least one-third of the distance from the transverse center of the blade to each side of the blade. ## Claims ### Claim 1 An elongated skate blade for an ice skate, said blade comprising: (a) a first acute-angled cutting edge formed longitudinally on one side of said blade for providing cutting engagement with an ice surface; (b) a second acute-angled cutting edge formed longitudinally on the opposite side of said blade for providing cutting engagement with the ice surface; and, (c) a generally downwardly facing longitudinally extending bottom surface extending transversely from said first cutting edge to said second cutting edge, said bottom surface including: (i) a first longitudinally extending edge face rising upwardly and inwardly from said first cutting edge; (ii) a second longitudinally extending edge face rising upwardly and inwardly from said second cutting edge; and, (iii) a longitudinally extending middle face centrally disposed between said first and second edge faces and merging substantially smoothly therewith, said middle face having a substantially flat profile in transverse cross-section for at least one-third of the distance from the transverse centre of the blade to each side of the blade. ### Claim 2 (depends on 1) A skate blade as defined in claim 1, wherein said middle face has a substantially flat profile in transverse cross-section for at least one-half of the distance from the transverse centre of the blade to each side of the blade. ### Claim 3 (depends on 2) A skate blade as defined in claim 2, wherein said first and second edge faces have a downwardly concave profile in transverse cross-section. ### Claim 4 (depends on 1, 2) A skate blade as defined in claim 1, 2, or 3, wherein said substantially flat profile is disposed above the level of said cutting edges. ### Claim 5 (depends on 1, 2, 3) A skate blade as defined in claim 1, 2 or 3, wherein said substantially flat profile is disposed approximately level with the level of said cutting edges. ### Claim 6 (depends on 1, 2, 3) A skate blade as defined in claim 1, 2 or 3, wherein said substantially flat profile is disposed below the level of said cutting edges. ### Claim 7 An elongated skate blade for an ice skate, said blade comprising: (a) a first acute-angled cutting edge formed longitudinally on one side of said blade for providing engagement with an ice surface; (b) a second acute-angled cutting edge formed longitudinally on the opposite side of said blade for providing cutting engagement with the ice surface; and, (c) a generally downwardly facing longitudinally extending bottom surface extending transversely from said first cutting edge to said second cutting edge, said bottom surface including: (i) a first longitudinally extending edge face rising upwardly and inwardly from said first cutting edge; (ii) a second longitudinally extending edge face rising upwardly and inwardly from said second cutting edge; and, (iii) a longitudinally extending middle face centrally disposed between said first and second edge faces, said middle face having a downwardly convex profile in transverse cross-section, the radius of curvature of which profile exceeds the width of the blade at all points of the profile for at least one-third of the distance from the transverse centre of the blade to each side of the blade. ### Claim 8 (depends on 7) A skate blade as defined in claim 7, wherein the radius of curvature of said convex profile exceeds the width of the blade at all points of the profile for at least one-half of the distance from the transverse centre of the blade to each side of the blade. ### Claim 9 (depends on 8) A skate blade as defined in claim 8, wherein said first and second edge faces have a downwardly concave profile in transverse cross-section. ### Claim 10 (depends on 7, 8, 9) A skate blade as defined in claim 7, 8 or 9, wherein the middle face is disposed above the level of said cutting edges. ### Claim 11 (depends on 7, 8, 9) A skate blade as defined in claim 7, 8 or 9, wherein the lowermost part of said downwardly convex profile is disposed approximately level with the level of said cutting edges. ### Claim 12 (depends on 7, 8, 9) A skate blade as defined in claim 7, 8 or 9, wherein the lowermost part of said downwardly convex profile is disposed below the level of said cutting edges. ### Claim 13 An elongated skate blade for an ice skate, said blade comprising: (a) a first acute-angled cutting edge formed longitudinally on one side of said blade for providing cutting engagement with an ice surface when the blade is laterally tilted in one direction from an upright attitude on the ice surface; (b) a second acute-angled cutting edge formed longitudinally on the opposite side of said blade for providing cutting engagement with the ice surface when the blade is laterally tilted in the opposite direction from said upright attitude; and, (c) a generally downwardly facing longitudinally extending bottom surface extending transversely from said first cutting edge to said second cutting edge, said bottom surface including: (i) a first longitudinally extending edge face rising upwardly and inwardly from said first cutting edge; (ii) a second longitudinally extending edge face rising upwardly and inwardly from said second cutting edge; and, (iii) a downwardly protruding longitudinally extending middle face centrally disposed between said first and second edge faces and merging substantially smoothly therewith, said middle face for providing sliding engagement with the ice surface having a transverse cross-sectional profile such that: (A) the length of tangent lines extending transversely inwardly and downwardly from the first cutting edge to points of tangency with said middle face is not more than one-third of the width of the blade; and, (B) the length of tangent lines extending transversely inwardly and downwardly from the second cutting edge to points of tangency with said lower face is not more than one-third of the width of the blade. ### Claim 14 (depends on 13) A skate blade as defined in claim 13, wherein said first and second edge faces have a downwardly concave profile in transverse cross-section. ### Claim 15 (depends on 13, 14) A skate blade as defined in claim 13 or 14, wherein said middle face has a downwardly convex profile in transverse cross-section. ### Claim 16 (depends on 13, 14) A skate blade as defined in claim 13 or 14, wherein a central portion of said middle face has a substantially flat profile in transverse cross-section. ### Claim 17 (depends on 13, 14) A skate blade as defined in claim 13 or 14, wherein the length of said tangent lines is not less than one-eighth and not more than one-quarter of the width of the blade. ### Claim 18 (depends on 14) A skate blade as defined in claim 14, wherein said middle face has a relatively wide longitudinally extending central portion extending transversely between first and second longitudinally extending shoulders of the middle face, the transverse cross-sectional profile of the middle face curving upwardly and outwardly relatively steeply at such shoulders. ### Claim 19 (depends on 18) A skate blade as defined in claim 18, wherein said central portion of the middle face has a convex profile in transverse cross-section. ### Claim 20 (depends on 18) A skate blade as defined in claim 18, wherein said central portion of the middle face has a substantially flat profile in transverse cross-section. ### Claim 21 (depends on 18, 19, 20) A skate blade as defined in claim 18, 19 or 20, wherein the length of said tangent lines is not less than one-eighth and not more than one-quarter of the width of the blade. ### Claim 22 An elongated skate blade for an ice skate, said blade comprising: (a) a first acute-angled cutting edge formed longitudinally on one side of said blade for providing cutting engagement with an ice surface when the blade is laterally tilted in one direction from an upright attitude on the ice surface; (b) a second acute-angled cutting edge formed longitudinally on the opposite side of said blade for providing cutting engagement with the ice surface when the blade is laterally tilted in the opposite direction from said upright attitude; and, (c) a generally downwardly facing longitudinally extending bottom surface extending transversely from said first cutting edge to said second cutting edge, said bottom surface including: (i) a first longitudinally extending edge face rising upwardly and inwardly from said first cutting edge; (ii) a second longitudinally extending edge face rising upwardly and inwardly from said second cutting edge; and, (iii) a downwardly protruding longitudinally extending middle face centrally disposed between said first and second edge faces for providing sliding engagement with the ice surface, said middle face having a transverse cross-sectional profile such that: (A) the length of tangent lines extending transversely inwardly and downwardly from the first cutting edge to points of tangency with said middle face is not more than one-third of the width of the blade; and, (B) the length of tangent lines extending transversely inwardly and downwardly from the second cutting edge to points of tangency with said lower face is not more than one-third of the width of the blade, wherein said tangent lines extend downwardly from said cutting edges at angles of not more than 20.degree. relative to the horizontal when the blade is in said upright attitude. ### Claim 23 (depends on 22) A skate blade as defined in claim 22, wherein said first and second edge faces have a downwardly concave profile in transverse cross-section. ### Claim 24 (depends on 22, 23) A skate blade as defined in claim 22 or 23, wherein a longitudinally extending central portion of said middle face has a downwardly convex profile in transverse cross-section, the radius of curvature of which profile generally increases with distance away from the transverse centre of the blade. ### Claim 25 (depends on 22, 23) A skate blade as defined in claim 22 or 23, wherein a longitudinally extending central portion of the middle face has a substantially flat profile in transverse cross-section. ### Claim 26 (depends on 22, 23) A skate blade as defined in claim 22 or 23, wherein the length of said tangent lines is not less than one-eighth and not more than one-quarter of the width of the blade. ### Claim 27 (depends on 22, 23) A skate blade as defined in claim 22 or 23, wherein said tangent lines extend downwardly from said cutting edges at angles of not less than 1.degree. and not more than 10.degree. relative to the horizontal when the blade is in said upright attitude. ### Claim 28 (depends on 22, 23) A skate blade as defined in claim 22 or 23, wherein: (a) the length of said tangent lines is not less than one-eighth and not more than one-quarter of the width of the blade; and, (b) said tangent lines extend downwardly from said cutting edges at angles of not less than 1.degree. and not more than 10.degree. relative to the horizontal when the blade is in said upright attitude. ### Claim 29 (depends on 22) A skate blade as defined in claim 22, wherein said middle face has a relatively wide longitudinally extending central portion extending transversely between first and second longitudinally extending shoulders of the middle face, the transverse cross-sectional profile of the middle face curving upwardly and outwardly relatively steeply at such shoulders. ### Claim 30 (depends on 29) A skate blade as defined in claim 29, wherein said central portion of the middle face has a convex profile in transverse cross-section. ### Claim 31 (depends on 29) A skate blade as defined in claim 29, wherein said central portion of the middle face has a substantially flat profile in transverse cross-section. ### Claim 32 (depends on 29, 30, 31) A skate blade as defined in claim 29, 30 or 31, wherein the length of said tanget lines in not less than one-eighth and not more than one-quarter of the width of the blade. ### Claim 33 (depends on 29, 30, 31) A skate blade as defined in claim 29, 30 or 31, wherein said tangent lines extend downwardly from said cutting edges at angles of not less than 1.degree. and not more than 10.degree. relative to the horizontal when the blade is in said upright attitude. ### Claim 34 (depends on 29, 30, 31) A skate blade as defined in claim 29, 30 or 31, wherein: (a) the length of said tangent lines is not less than one-eighth and not more than one-quarter of the width of the blade; and, (b) said tangent lines extend downwardly from said cutting edges at angles of not less than 1.degree. and not more than 10.degree. relative to the horizontal when the blade is in said upright attitude.