1. Field of the Invention
The present invention relates to a movable contact structure and a movable contact attaching method of a slide switch applied to an inhibitor switch for detecting a shift position of an automobile.
2. Description of the Related Art
A movable board as shown by, for example, FIG. 10A or FIG. 10B is used for an inhibitor switch as a slide switch of a related art. FIG. 10A is a sectional view of a movable board, FIG. 10B is a disassembled perspective view of a movable board according to other related art and FIG. 10C is a partially enlarged sectional view in view from arrow marks Sc—Sc of FIG. 10B.
First, according to a movable board 101 of FIG. 10A, a movable contact 105 is fixed to a movable board main body 103 made of resin by calking a rivet 109 via a washer 107. The movable contact 105 is formed with a bent portion 111 and a contact arm 113 is arranged to incline relative to the movable board main body 103 by the bent portion 111. A contact portion 115 of the movable contact 105 is at a distance of H from the movable board main body 103 in a free state and the contact portion 115 is constituted to be brought into elastic contact with a side of a fixed contact by predetermined contact pressure (for example, refer to Patent Literature 1).
According to a movable board 101A of FIG. 10B, a movable contact 105A is inserted into a movable board main body 103A from a side direction to be fixed thereto by so-to-speak snap fit. That is, as shown by FIG. 10B and FIG. 10C, the movable main body 103A is provided with a stepped portion 117 and an engaging portion 119 and the movable contact 105A is provided with play preventive pieces 121 and 123. When the movable contact 105A is inserted into the movable contact main body 103A from the side direction, the play preventive pieces 121 ad 123 are engaged with the stepped portion 117 and the engaging portion 119 and the fixed contact 105A can be integrated to the movable board main body 103A by one touch motion (for example, refer to Patent Literature 2).
(Patent Literature 1)
JP-UM-A-4-123038 (FIG. 8, FIG. 9)
(Patent Literature 2)
JP-A-10-134672 (page 3, FIG. 2)
However, the movable board 101 of FIG. 10A needs the rivet 109 and the washer 107 as fixing parts and needs a step of integrating the rivet 109 and the washer 107 and a step of calking the rivet 109 in integration. Therefore, there poses a problem that integration and part control are very complicated.
In contrast thereto, according to the movable board 101A of FIGS. 10B and 10C, fixing is carried out by the snap fit and therefore, there is an advantage of dispensing with the rivet or the like and facilitating integration and part control.
However, there poses a problem that play is liable to be produced between the play preventive pieces 121 and 123 and the stepped portion 117 and the engaging portion 119 and the contact portion 115 of the movable contact 105A is rattled relative to a fixed contact and accuracy of switching ON/OFF is difficult to achieve sufficiently.