Abstract: A closed type connecting block including a shutter which close and open an opening formed on a housing and which is biased toward a position to close the opening. The shutter and the housing are formed with notches which sealingly receive a core inserted into the connecting block therebetween. The connecting block also includes a pivotable jack mounted therein to enable users to easily insert and remove a plug connected to the cord from communication equipment.

Abstract: An electrical connector includes contacts to be connected to lead wires and a housing having apertures for receiving the contacts. The lead wires are connected to the contacts when the contacts are forced into the apertures of the housing. Each of the contacts comprises at one end a contact element to be in contact with an external terminal and at the other end a connection portion formed with a lead aperture through which a lead wire passes and with a slit continuous with the lead aperture. Edges of the slit pierce into an insulating coating of the lead wire and connect with a core of the lead wire under pressure.