| 摘要 |
A latch for retaining printed circuit boards (PCB) or other types of daughter cards (29) in a card file (11) is disclosed. Two latch mechanisms (43a and 43b), one located adjacent the outer corner of each card, engage latch slots (35) when the cards (29) are correctly installed. Each latch mechanism (43a and 43b) includes a latch housing (45), a plunger assembly (47) mounted in the latch housing (45), and large coil springs (49a and 49b) that create a force in a direction parallel to the direction of card installation. The large coil springs (49a and 49b) urge the plunger assembly (47) away from the direction of card installation and out of alignment with an opening (77) in the latch housing (45). The plunger assembly (47) includes a plunger housing (53), a latch pin (55), a smaller coil spring (59), and a latch pin retraction lever (57). The plunger housing (53) includes a chamber (87) having an open end that is alignable with the opening (77) in the latch housing (45) when the large cob springs (49a and 49b) are sufficiently compressed. The latch pin (55) and the small coil spring (59) lie orthogonal to the direction of card installation and are mounted in the chamber (87) of the plunger housing. As a result, when the open end of the chamber is aligned with the latch housing opening, the latch pins are free to slide outwardly, into the latch slots if the card file is suitably positioned. The latch pin retraction lever (57) is used to withdraw the latch pins to flow card removal. A flag (105) is exposed when the latch pins (55) are extended.
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