Electrical connector for exerting multiple elastic forces

Claim 1

An electrical connector having at least one contact element mounted in said connector for electrically connecting a daughter printed circuit board insertable in said contact elements and a mother printed circuit board connected to said connector. an elongate connector base having a transverse slot corresponding to each contact element, said slot being defined by a first and a second side wall. a pair of latch holders respectively formed on two opposite end portions of said connector base, and two latches, each said latch mounted in each said latch holder for resiliently and detachably holding the daughter printed circuit board in said connector base of said connector; said contact element being made of an electrically conductive material and including; a base member mounted in said slot of said connector base, a leg member protruding downwardly from said base member to be fixed to the mother board, at least a male engaging member formed on the base member engageable with a female hole formed in the connector base of the connector, a pivot portion formed on the base member, a first spring arm member secured to the pivot portion and having at least a portion thereof proximate to said first side wall in the slot, a first contacting protrusion formed as a convex portion adjacent to the first spring arm member for contacting a first side of a contact area of said daughter board, a concave linking member concave downwardly from the first contacting protrusion, a second contacting protrusion connected with the concave linking member and formed as another convex portion for facing the first contacting protrusion for contacting a second side of the contact area of said daughter board and defining an aperture between said first and said second contacting protrusions, and a second spring arm member adjacent to the second contacting protrusion protruding sidewardly towards said second side wall in the slot opposite to the first side wall, the improvement which comprises: said second spring arm member having an upper bending portion secured to the second contacting protrusion and a lower free end portion pendant from the upper bending portion to approximate the base member; and said first spring arm member, said first contacting protrusion, said concave linking member, said second contacting protrusion and said second spring arm member of said contact element continuously connected to form an inversed omega shape. whereby upon an insertion of said daughter board to be clamped by said two contacting protrusions, said daughter board is rotated to bias said contact element to allow said second spring arm member to bear against said second side wall in said slot for exerting multiple elastic forces in said contact element for efficiently clamping said daughter board.