| 摘要 |
PURPOSE: To provide a jack improved sp as to prevent interruption of electric connection between a plug and the concerned jack. CONSTITUTION: In an electric connection device provided with a jack, a hole 16c of sinking a shoulder part of an insulating collar 5 in a point end of a plug is formed in an extending part 16b in a position adjacent to a protruded part 16a of an electric connection piece 16 of this jack. Even when the plug is placed under a condition where it is wrenched in a vertical direction, the protruded part 16a of the electric connection piece 16 is prevented from separating from a cylindrical electrode 4 of this plug, to maintain a contact condition between these protruded part 16a and electrode 4. |
