Abstract: An electric jack for receiving a plug to form the electric connection therebetween includes a main body made of electrically insulated resin and a plurality of movable contact strips. The main body has formed therein; a central hole through which the plug is insertable in an axial direction; a plurality of contact strip-clamping recesses extending in a direction perpendicular to the axial direction, the recesses being arranged in parallel with each other in the axial direction; a plurality of contact strip-fitting holes each being communicated with respective recesses; and a window portion through which the recesses are communicated with the central hole. The movable contact strip has a fitting portion to be inserted into the fitting hole of the main body and a contact portion to be clamped into the recess of main body. When the movable contact strip is inserted into the main body, the contact portion of movable contact strip is partially projected into the central hole through the window portion.

Abstract: A pin plug comprises an inner contact member in the form of a pin made of metal, an outer contact member in the form of a cylindrical metal body and an insulating member for fixing the inner and outer contact members in position in an electrically insulating manner. Said insulating member comprises an inner insulating member consisting of two semi-cylindrical halves which form in a joined condition a hollow cylindrical space in which said inner contact pin is fit. The insulating member further comprises an outer insulating member or cover made of relatively resilient material. The outer contact member consists of two semi-cylindrical halves which are fixed around the outer surface of the inner insulating member. The assembly of the inner contact pin, the inner insulating member surrounding the pin and the outer contact member surrounding the inner insulating member is resiliently inserted into the space of the outer insulating cover.