Method and apparatus for measuring and orienting golf club...

A - Human Necessities – 63 – B

Patent

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Details

A63B 57/00 (2006.01) A63B 53/00 (2006.01) A63B 59/00 (2006.01) B23Q 17/00 (2006.01) G01H 1/00 (2006.01) G01H 13/00 (2006.01) G01L 1/04 (2006.01) G01L 1/10 (2006.01) A63B 53/10 (2006.01)

Patent

CA 2427839

The preferred orientation, or planar oscillation plane, of a golf club shaft (110) is located by measuring the oscillation (20, 21) of the shaft (110) when an impulse is applied. Preferably, the out-of-plane oscillation is measured at a large number of angular positions about the shaft (110) axis, and the principal planar oscillation plane is identified by that pair of opposed angular positions in which the out-of-plane oscillation is smallest. The location of the preferred orientation may be marked on the shaft (110) and used to assemble a golf club with the planar oscillation plane in a predetermined orientation. The staightness of the shaft (110) can also be determined by deriving its spring constant from its oscillation frequency and then measuring the restoring force when the shaft is deflected by the same nominal amount at different angular positions; differences in restoring force can be attibuted to differences in actual deflection distance resulting from lack of straightness.

On situe l'orientation préférée, ou le plan d'oscillation planaire, d'une tige de club de golf (110) en mesurant l'oscillation (20, 21) de la tige (110) lors de l'application d'une impulsion. De préférence, l'oscillation sortant du plan est mesurée dans un grand nombre de positions angulaires par rapport à l'axe de la tige (110), et le plan principal d'oscillation planaire est identifié par la paire de positions angulaires opposées dans lesquelles l'oscillation sortant du plan est minimale. La position de l'orientation préférée peut être marquée sur la tige (110) et utilisée pour l'assemblage d'un club de golf ayant un plan d'oscillation planaire qui correspond à une orientation prédéterminée. La rectitude de la tige (110) peut aussi être déterminée par la dérivation de la raideur totale à partir de sa fréquence d'oscillation puis par la mesure de la force de rétablissement lorsque la tige est défléchie par une même quantité nominale dans des positions angulaires différentes. Les différences de la force de rétablissement peuvent être attribuées à la distance de déflexion réelle due au manque de rectitude.

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