Patent ID: 6963492

Claim:
A lockable retractable locating frame of a BGA on-top test socket, atop a base of the test socket, spacing from the base with a plurality of stroke spaces for defining an operational stroke between the base and the locating frame, comprising at least a push-and-lock mechanism neighboring one of the stroke spaces, the push-and-lock mechanism further comprising: an accommodation room, constructed inside the locating frame by having an opening connecting with the stroke space, spacing a lateral surface of the locating frame with a division wall; a sliding slot, constructed at the division wall by extending longitudinally to the stroke space, connecting the accommodation room to the lateral surface; and a slider, movable on the sliding slot for protruding into the stroke space, further comprising; a driving portion, located outside the lateral surface of the locating frame; a tongue portion, nested in the accommodation room for protruding partly into the stroke space through the opening; and a connection portion, connecting the driving portion and the tongue portion through the division wall by penetrating the sliding slot, movable along the sliding slot; wherein the push-and-lock mechanism includes a nest state and a protrusion state; while in the nest state, the tongue portion being completely accommodated inside the accommodation room; while in the protrusion state achieved by acting at the driving portion to move the slider a predetermined distance toward the stroke space along the sliding slot, the tongue portion having a front end thereof to locate inside the stroke space and forming a predetermined contact relationship with the base.