Jack

A jack comprising:

• a columnar contact of a columnar shape and an insulating housing which houses the columnar contact;
• wherein the insulating housing comprises:
• a plug connection opening, into which a mating plug is inserted;
• a contact insertion chamber for receiving the mating plug to be inserted from the plug connection opening;
• and a contact insertion opening being in communication with the contact insertion chamber via a cylindrical passage that has a cylindrical shape of predetermined length and being provided as opposed to the plug connection opening;
• wherein the columnar contact comprising is a cylindrical hollow part is in a hollow columnar shape with conductivity and is inserted along an axial direction into the contact insertion chamber from the contact insertion opening,
• wherein the contact insertion opening and the cylindrical passage have inner diameters of substantially the same size, which is substantially the same as or slightly larger than the outer diameter of the columnar contact so as to enable the columnar contact to be inserted readily, and
• wherein a press-fit pin is press-fitted into the hollow part of the hollow columnar shape of the columnar contact,
• wherein the columnar contact comprises:
• a crimp part to be connected by crimping with a lead wire:
• and a pair of L-shaped tongues being provided in a vicinity of a base part of the hollow columnar shape being provided toward the crimp part;
• wherein the contact insertion opening, into which the hollow columnar contact is inserted along an axial direction, comprises:
• a first latching part being provided in a vicinity of the contact insertion opening, the first latching part engaging with the pair of L-shaped tongues so as to restrains rotation of the hollow columnar contact about the axial direction;
• and
• a second latching part to contact with the pair of L-shaped tongues as the hollow columnar contact is inserted into the contact insertion opening to stop the hollow columnar contact at a predetermined position,
• wherein the columnar contact further comprises a column connecting base part and an engaging base part in a vicinity of the base part,
• wherein the contact insertion opening of the housing further comprises a third latching part for latching onto the engaging base part and thereby preventing falling-off of the columnar contact from the housing, and
• wherein the press-fit pin comprises a small-diameter axial part with an outer diameter smaller than the inner diameter of the hollow part;
• a large-diameter axial part with an outer diameter that is substantially the same as or slightly larger than the inner diameter of the hollow part;
• and a head part with an outer diameter having a larger outer diameter than that of the large-diameter axial part such that the outer diameter is inserted to push and spread the pair of L-shaped tongues, wherein the small-diameter axial part, the small-diameter axial part, and the head part are provided in the order from a front end of the pin in the insertion direction to be coaxial.