| 摘要 |
<p>A golf club with an outer tube formed from hickory, ash or birch and with an inner hollow tube formed of chrome-moly or other steelalloy aluminum, titanium, graphite fibers, boron fibers, graphite-boron fibers or fiberglass fibers. The outer tube has a bore of uniform diameter from end to end that closely fits the inner tube which has uniform inner and outer diameters from end to end. An epoxy adhesive bonds the tubes together. The wood tube is bored by a riflebore drill on an engine lathe, from a larger piece of wood which is turned to a smaller diameter after drilling. An extension of the shaft upper end of lower weight-to-length ratio than the remainder of the shaft, formed at least partly of plastic foam, and secured with a cylindrical boss bonded within the upper end of the inner tube. The lower end of the shaft is confined, to reduce hairline splitting of the wood tube, by the club head hosel or by cord whipping, and the shaft has various kinds of connections to the club head.</p> |
