| 摘要 |
<p>A holder (11) is characterized in that the holder (11) is provided with insertion members (33) and arm members (31, 32) formed so that connection parts (31a, 32a) are separated by a first set distance, the insertion members (33) have an annular part (33b) separated from the center axis of a through hole (33d) by a second set distance and having an annular shape, the arm members (31, 32) can be moved on a contact surface of the head surface so that desired positions of the annular parts (33b) of the insertion members (33) are connected to the connection parts (31a, 32a) of the arm members (31, 32) when given positions among the whole parts of the annular parts (33b) of the insertion members (33) are connected to the connection parts (31a, 32a) of the arm members (31, 32), and in that the arm members (31, 32) can be rotated in the normal direction of the head surface when the connection parts (31a, 32a) rotate with respect to the annular parts (33b) in the normal direction of the head surface while the connected state between the desired positions of the annular parts (33b) of the insertion members (33) and the connection parts (31a, 32a) of the arm members (31, 32) is maintained.</p> |
