Patent ID: 11896880
Assignee: KARSTEN MANUFACTURING CORPORATION
Field: Furniture, games (Other fields)
Classification: CPC A | IPC A

Claim 11:
12. A putter shaft comprising:
a tubular body comprising:
a plurality of bias plies and a plurality of longitudinal plies;

wherein: the plurality of bais plies comprise a graphite composite with a modulus greater than 60 msi and the plurality of longitudinal plies comprise a graphite composite with a modulus value between 54 msi and 56 msi,
a tip end; and
a butt end;
wherein:
the putter shaft has a length, measured between the tip end and the butt end, that is inclusively between 32 inches and 38 inches;
the putter shaft has a shaft mass inclusively between 115 grams and 135 grams;
the putter shaft comprises at least 6 full length plies;
at least 4 of the full length plies comprise a modulus value of at least 60 msi; and
the putter shaft comprises an ultra-high stiffness as evidenced by:
a frequency value of greater than 650 cpm;
a tip deflection of less than 1.0 inch (2.54 cm); and
a torsional stiffness of less than 1.5 degrees;
wherein the frequency value is the number of oscillations that the tip end undergoes per minute when a first 6 inches of the butt end is clamped, a 205 gram weight is attached onto the tip end, and the tip end has been displaced and released; wherein the frequency value is measured within the first 2 to 10 oscillation cycles;
wherein the tip deflection is the perpendicular displacement of the tip end of the putter shaft from an at-rest position of the putter shaft when a first 6 inches of the butt end is clamped and a 3.9 lb load is applied perpendicularly to the putter shaft at 1 inch inward from the tip end; and
wherein the torsional stiffness is an angle of twist when the putter shaft a first 6 inches of the butt end is clamped, a first 1 inch of the tip end is clamped, and a torque load of 1 ft*lb is applied to the clamped tip end.