초록 ▼

A shaft according to the present invention is obtained by winding and curing a prepreg sheet having a matrix resin and a fiber. The prepreg sheet includes a full-length sheet and a partial sheet. At least a part of the partial sheet forms a tip bias layer disposed in a tip portion of the shaft. A fi

A shaft according to the present invention is obtained by winding and curing a prepreg sheet having a matrix resin and a fiber. The prepreg sheet includes a full-length sheet and a partial sheet. At least a part of the partial sheet forms a tip bias layer disposed in a tip portion of the shaft. A fiber of the first tip bias layer is oriented at an angle which is equal to or greater than 25 degrees and is equal to or smaller than 65 degrees with respect to an axis of the shaft. A fiber of the second tip bias layer is oriented at an angle which is equal to or greater than −65 degrees and is equal to or smaller than −25 degrees with respect to the axis of the shaft. The shaft is obtained by winding a tip bias stuck body (V1) fabricated by sticking a first tip bias sheet (a8) and a second tip bias sheet (a9) together.

대표청구항 ▼

What is claimed is: 1. A shaft for a golf club which is obtained by winding and curing a prepreg sheet having a matrix resin and a fiber, the prepreg sheet including a full-length sheet provided wholly in an axial direction of the shaft and a partial sheet provided in a part in the axial direction o

What is claimed is: 1. A shaft for a golf club which is obtained by winding and curing a prepreg sheet having a matrix resin and a fiber, the prepreg sheet including a full-length sheet provided wholly in an axial direction of the shaft and a partial sheet provided in a part in the axial direction of the shaft,wherein at least a part of the partial sheet forms a tip bias layer disposed in a tip portion of the shaft,the tip bias layer has a first tip bias layer and a second tip bias layer,a fiber of the first tip bias layer is oriented at an angle which is equal to or greater than −65 degrees and is equal to or smaller than −25 degrees with respect to an axis of the shaft,a fiber of the second tip bias layer is oriented at an angle which is equal to or greater than 25 degrees and is equal to or smaller than 65 degrees with respect to the axis of the shaft,there is wound a tip bias stuck body having a first tip bias sheet to be a sheet for the first tip bias layer and a second tip bias sheet to be a sheet for the second tip bias layer which are stuck together, andwhen an end on a winding start side of the first tip bias layer is represented by T1 and an end on a winding start side of the second tip bias layer is represented by T2, an angle difference θ between a position in a circumferential direction of the end T1 and a position in the circumferential direction of the end T2 is equal to or smaller than 90 degrees.