| 摘要 |
PURPOSE:To prevent the deformation and misalignment of contact point pins and keep stable detecting accuracy by soldering those pins to the connecting terminals of a metal connector and then molding them monolithically using an insulation, except for the contact part of the central pole of the pins. CONSTITUTION:A pin retainer 9 is molded with an insulation material 17 such as epoxy resin, in respect of its connecting terminals 141-144 and other portions than the tips of contact point pins 81-84, and a reinforcement collar is fixed to cover the external surface of the insulation material 17. Consequently, even if a detecting rod 4 is turned by the fluctuation of the line of an edge preparation 27 and a central pole 5 is internally pressed to collide with the contact point pins 81-84 due to the turn of said rod 4, these pins 81-84 are free from deformation to an external side and a constant space can be kept between the pole 5 and the pins 81-84, thereby eliminating improper contact or inability of contact, and enabling the maintenance of stable detecting accuracy.
|
