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US 5,346,212 AGranted
Racket for ball games and string portion or string therefor
OwnerSiegfried Kueblerinventor
Life of this patent
Estimating the term…
Abstract
In an racket for ball games, in particular a tennis racket, having a stringing surface which is provided in a stringing frame and comprising mutually crossing strings as sections of at least one longer string portion the strings in one direction have different cross-sections from the middle region of the stringing surface to the shortest string in that direction. The strings themselves have cross-sections which, from the corresponding central axis of the stringing surface, increase or decrease in a plurality of steps to the shortest string in this direction.
Claims16
A racket for ball games, which comprises:
- a stringing frame having a string area with a middle region thereof;
- a stringing surface in said frame comprising mutually crossing string lengths in a first and second direction, wherein said string lengths are sections of at least one longer string portion, at least some of said string lengths having different lengths in said frame;
- wherein said string sections in one direction in the middle region of said stringing surface have different cross-sections than the shortest string section in said direction;
- and wherein at least one of said string portion and string section is of varying cross-section.
1 more element
A racket for ball games, which comprises:
- a stringing frame having a stringing area with a middle region thereof;
- a stringing surface in said frame having central axes thereof comprising mutually crossing, longitudinal and transverse strings in a first and second direction, with the centermost string being adjacent the corresponding central axis, at least some of said mutually crossing strings having different lengths in said frame;
- wherein the strings in one direction of said stringing surface have cross-sections which, from the corresponding central axis of the stringing surface at least one of increase and decrease to the shortest string in said direction;
- and wherein one of the strings have ends and a longitudinal conical shape from one end to the other end.
1 more element
A racket for ball games, which comprises:
- a stringing frame having a stringing area with a middle region thereof;
- a stringing surface in said frame having central axes thereof comprising mutually crossing, longitudinal and transverse strings in a first and second direction, with the centermost string being adjacent the corresponding central axis, at least some of said mutually crossing strings having different lengths in said frame;
- wherein the strings in one direction of said stringing surface have cross-sections which, from the corresponding central axis of the stringing surface at least one of increase and decrease to the shortest string in said direction;
- and including gut strings with a plurality of longitudinal strings and a plurality of transverse strings, wherein at least one string of said plurality comprises a string section which has a decreasing cross-section from its middle towards its two ends.
1 more element
A racket for ball games, which comprises:
- a stringing frame having a stringing area with a middle region thereof;
- a stringing surface in said frame having central axes thereof comprising mutually crossing, longitudinal and transverse strings in a first and second direction, with the centermost string being adjacent the corresponding central axis, at least some of said mutually crossing strings having different lengths in said frame;
- wherein the strings in one direction of said stringing surface have cross-sections which, from the corresponding central axis of the stringing surface at least one of increase and decrease to the shortest string in said direction;
- including plastic strings with a plurality of longitudinal strings and a plurality of transverse strings, wherein at least one string of said plurality comprises a string section which has an increasing cross-section from its middle towards both ends.
1 more element
A racket for ball games, which comprises:
- a stringing frame having a stringing area with a middle region thereof;
- a stringing surface in said frame having central axes thereof comprising mutually crossing, longitudinal and transverse strings in a first and second direction, with the centermost string being adjacent the corresponding central axis, at least some of said mutually crossing strings having different lengths in said frame;
- wherein the strings in one direction of said stringing surface have cross-sections which, from the corresponding central axis of the stringing surface at least one of increase and decrease to the shortest string in said direction;
- including gut strings and including also a string section of uniform cross-section, and adjacent the said section of uniform cross-section is a string section of longitudinal conical shape.
1 more element
Dependencies are inferred from the claim text.