Patent ID: 9566486
Date: 2017-02-14
CPC Classifications: A63B

Claim:
1. A tubular steel golf shaft form comprising: a grip section at one end, a tip section at an opposite end, and an intermediate mid-section that connects the grip section to the tip section, wherein the outside diameter of the mid-section tapers from a first diameter at the juncture with the grip section to a second diameter smaller than said first diameter at the junction with the tip section, and further wherein said intermediate mid-section includes a loading zone having an overall taper defined by a taper line and comprising a substantially continuous plurality of micro-step sections; wherein each of said plurality of micro-step sections in the direction from said one end toward said opposite end comprises in cross-section a first peak having a diameter (A) descending at an angle of approximately 1° to approximately 5° relative to said taper line to a valley having a diameter (B) and ascending at an angle of approximately 1° to approximately 5° relative to said taper line to a second peak having a diameter (C), wherein (B) is less than (C) which is less than (A), wherein the lineal distance from said first peak to said second peak is less than 0.5 inches, and further wherein the cross-section in the loading zone is a circle with a fixed radius.