Small-sized push-button switch

Claim 1

A small-sized push-button switch which comprises: at least one switch mechanism, each including a movable contact, fixed contacts disposed on opposite sides of the movable contact, a switch base for holding the lower portions of the movable contact and fixed contacts, an arm extending upwardly and being swung about one side portion of the switch base as a fulcrum and a resilient piece provided between the arm and the movable contact, a switch auxiliary base for holding the switch mechanism therein, a plunger having a push-button provided at the top and an inclined surface provided on the bottom thereof said plunger disposed on the arm so that the inclined surface of the plunger is slidable on the outer top surface of the arm, said plunger causing the arm to be swung in a direction by depression of the push-button and causing the movable contact to be moved in the other direction due to the action of the resilient piece whereby a switching operation is made, the direction of movement of the plunger, the movable contact and fixed contacts being disposed vertically, a heart cam formed on one side of the plunger for the heart cam being provided under the lower portion thereof with a cut-out, a resilient plate attached to the switch auxiliary base disposed below the plunger and provided with an aperture, and a hook pin adapted to be pushed toward the heart cam from the outside and folded at upper and lower ends in opposite directions, one end of the hook pin being inserted into the aperture of the resilient plate to form a fulcrum and the other end of the hook pin being engaged with the heart cam through the cut-out, the positions where the heart cam and the hook pin are disposed being made as a recess whereby said plunger maybe latched in a depressed position by said cam and pin.