Patent ID: 7677901
Filing Date: 2010-03-16
Classification: G01R,H01R,H05K

Abstract:
1. A contact comprising: a plunger formed of a sheet metal and a coil spring unit formed of a metal wire for holding the plunger thereon, wherein the plunger includes at least one upper contact strip having at least three contact points on an upper end portion thereof, a wide portion having a larger width than the width of the upper contact strip, and at least one lower contact strip having two contact strips of a smaller width than that of the wide portion, the two contact strips each having a contact point at a lower end portion thereof, the coil spring unit includes a spring portion which is resiliently deformable so as to be expandable and contractible in the vertical direction and a tight wound portion of a funnel shape having a guiding portion and a slimly wound portion having a contact point at a lower end portion thereof and having an outer diameter and an inner diameter smaller than those of the spring portion, the at least three contact points provided on the at least one upper contact strip are arranged in a plane so as to be broadened at a distance, the two contact points provided on the two contact strips of the at least one lower contact strip are arranged at a distance so as to oppose to each other, are formed so as to be resiliently deformable with respect to each other, and have a distance therebetween to be smaller than the inner diameter of the spring portion and larger than the inner diameter of the slimly wound portion, and the spring portion of the coil spring unit is compressed when the plunger is pushed downward, and the two contact points of the lower contact strip come into resiliently contact with an inner peripheral surface of the slimly wound portion.