Shaft assemblies for golf clubs

Details Shaft assemblies for golf clubs Shaft assemblies for golf clubs

1978-06-13

1980-12-23

Apley, Richard J.

Amusement devices: games

Aerial projectile game; game element or accessory therefor...

Target

A63B 5300, A63B 5312

Patent

active

042406315

ABSTRACT:
A problem in golf club manufacture is the very large number of different shafts required to make sets of clubs with different shaft flex characteristics. The invention teaches how it is possible to greatly reduce the number of different shafts used in a set by defining the shaft flex characteristics in terms of the EI value of the shaft. Recognizing that the EI value at a section, that is, at a distance from a selected datum, controls the amount of deflection and hence flex characteristics the invention teaches how it is then possible to use a single member shaft throughout a set and by altering the distance from the datum, and hence altering the EI value, a second and a third set and so on, having flex characteristics different from the first set can be produced from identical master shafts or shaft blanks.

REFERENCES:
patent: 1516786 (1924-11-01), Prentiss
patent: 3625513 (1971-12-01), Ballmer
patent: 3685135 (1972-08-01), Letters
patent: 3871649 (1975-03-01), Kilshaw
patent: 3963236 (1976-06-01), Mann
"The Search for the Perfect Swing", by Cochran and Stobbs, 1968, pp. 214-217.

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