| 摘要 |
<p>PURPOSE:To enable on angle of gravitational center to be simply measured by constituting a second swing body mounted swingably perpendicularly to the swing direction of a first swing body and a scale indicated on the first or second swing body so that one plane of the second swing body makes contacts with the tangential direction of a club face whatever direction the club face is directed. CONSTITUTION:A pin 70 is fixed to the surface of a first swing body 58 opposed to a second swing body 68 formed with a arcuate groove 72 into which is inserted the pin 70. The second swing body 68 swings within a range of the pin 70 making contact with both ends of the arcuate groove 72. The swing direction of the second swing body 68 is set parallel to the moving direction of an upper movable body 54 for example. A scale 74 is indicated on the surface of the second wing body 68 opposed to the first swing body 58. For example, an angle can be read from the scale 74 coinciding with a needle line 76 on the upper surface of the first swing body 58. This scale 74 is set such that a slant angle is zero degree when the second swing body 68 makes the maxi mum swing counterclockwise and increased as said body 68 swings clockwise from such a condition.</p> |
