| 摘要 |
The invention relates to a jack having a switch mechanism SW of the single-butt contact type in which an ON/OFF operation is performed by insertion/extraction of a plug (P). The switch mechanism is configured by: a stationary contact piece (12), and a movable contact piece (13) using a plate spring of a cantilevered beam, the contact pieces being opposed to each other outside a plug insertion hole (2) in a manner that, when the plug is inserted, the contact pieces are not contacted with the plug; and a separator (14) that is projected in the plug insertion hole in a manner that, when the plug is inserted, the insulator is pressed by the plug to be displaced. When the plug is inserted, a displacement load is applied by the separator to a middle portion in the length direction of the movable contact piece to flex the movable contact piece while setting a basal end portion of the movable contact piece as a fulcrum, whereby a tip end portion thereof is contacted with the stationary contact piece. Thereafter, the middle portion in the length direction of the movable contact piece is flexed while setting the tip end portion as a fulcrum, to apply a contact pressure on a contact. |
