Jack

Abstract

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. 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. As a result, miniaturization of the jack, and reduction of the production cost can be realized.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a section view of a jack which is an embodiment of the invention.

FIG. 2A is a rear (external face) view showing a stationary contact piece of a switch mechanism disposed in the jack of FIG. 1, and FIG. 2B is a side view of FIG. 2A.

FIG. 3A is a rear view showing a movable contact piece of the switch mechanism disposed in the jack of FIG. 1, FIG. 3B is a top view of FIG. 3A, and FIG. 3C is a side view of FIG. 3A.

FIG. 4A is a rear view showing a separator of the switch mechanism disposed in the jack of FIG. 1, FIG. 4B is a top view of FIG. 4A, FIG. 4C is a side view of FIG. 4A, and FIG. 4D is a section view taken along the line A-A of FIG. 4A.

FIG. 5 is a section view of a plug jack in a state where a plug is inserted halfway into the jack of FIG. 1.

FIG. 6 is a section view of the plug jack in a state where the plug is inserted completely into the jack of FIG. 1.

Claims

1. A jack having a switch mechanism of a single-butt contact type having a structure which is configured by: a stationary contact piece, and a movable contact piece using a plate spring of a cantilevered beam, said contact pieces being opposed to each other outside a plug insertion hole in a manner that, when a plug is inserted, said contact pieces are not contacted with the plug; and an insulator that is projected in said plug insertion hole in a manner that, when the plug is inserted, said insulator is pressed by the plug to be displaced, and in which, when the plug is inserted, a displacement load is applied by said insulator to a middle portion in a length direction of said movable contact piece to flex said movable contact piece while setting a basal end portion of said movable contact piece as a fulcrum, whereby a tip end portion of said movable contact piece is contacted with said stationary contact piece, and thereafter said middle portion in the length direction of said movable contact piece is flexed while setting said tip end portion as a fulcrum, to apply a contact pressure on a contact.

2. A jack according to claim 1, wherein an insulation wall is disposed in close contact with a side of said stationary contact piece which is opposite to said movable contact piece.

3. A jack according to claim 1, wherein said insulator is bent at a position corresponding to said middle portion in the length direction of said movable contact piece, one side with respect to said bent portion overlaps with a basal end side with respect to said middle portion in the length direction of said movable contact piece, an end portion of one side is coupled to said basal end portion of said movable contact piece, and another side with respect to said bent portion is inclinedly raised with respect to a tip end side with respect to said middle portion in the length direction of said movable contact piece to be projected in said plug insertion hole while progressively increasing a projection amount as advancing in a direction of insertion of the plug, and said middle portion in the length direction of said movable contact piece is pressed by said bent portion.

4. A jack according to claim 1, wherein said insulator is pressed and displaced by a plug tip disposed in the tip end of the plug.