Lock assembly for metal box

Claim 1

In a lock mechanism, the combination of: a face plate having an aperture, a cup member fixed to the face plate and having an opening aligned with said aperture, a pivot bolt mounted symmetrically on said cup member for turning movement and having a non-circular head portion positioned within said cup member, a latch arm on the pivot bolt, a manually graspable handle having ears receiving said pivot bolt portion between them, a pivot pin connecting said handle ears to said portion of said pivot bolt, whereby the handle may be swung about said pivot bolt away from the face plate, resilient means within the cup member opposing handle movement away from said face plate, a portion of the handle cooperating with the face plate and cup member to define an enclosure, said ears, resilient means and head portion of the pivot bolt being positioned within said enclosure, said handle having an apertured tab remote from said pivot pin, a lock pin slidably mounted on said face plate for engagement with said apertured tab, a key-operated mechanism mounted on said face plate between said lock pin and said pivot bolt and having a portion projecting from said face plate, the handle having an opening receiving said projecting portion, and means whereby said key-operated device may actuate said lock pin, whereby upon withdrawal of said lock pin from said apertured tab said handle may be swung away from said face plate about the pivot pin and subsequently turned to turn said pivot bolt.