Double acting dead latch mechanism

A lock mechanism comprising, in combination:

• a) a casing,
• b) a bolt housing and two latch bolts carried by the housing to be individually rotatable about a common vertical axis in response to engagement with a strikeplate, one latch bolt vertically offset relative to the other, and pin means carried by the housing and receivable in openings in said latch bolts, whereby the latch bolts are rotatable about the pin means, the pin means defining said vertical axis,
• c) the bolt housing and latch bolts movable as a unit horizontally forwardly and rearwardly within and relative to the casing.
• d) one latch bolt having a shoulder engageable with one surface on the casing in response to said rotation of said one latch bolt in a clockwise direction to displace the housing and the two latch bolts as a unit horizontally rearwardly by a first increment relative to the casing, whereby the two latch bolts are then positioned to be further engaged in camming relation by the strikeplate, traveling relatively in a first direction to displace both latch bolts and the housing horizontally rearwardly by a second increment relative to the casing, the other latch bolt having a shoulder engageable with another surface on the casing in response to said rotation of the other latch bolt in a counterclockwise direction, thereby to displace the housing and the two latch bolts as a unit horizontally rearwardly by a third increment relative to the casing, whereby the two latch bolts are then positioned to be further engaged in camming relation by the strikeplate, traveling relatively in a second direction, to displace both latch bolts and the housing horizontally rearwardly by a fourth increment relative to the casing,
• e) said bolts having enlarged hubs forming said pin receiving openings, said latch bolts having hub extensions forming said shoulders, which define fulcrums, said extensions projecting axially oppositely.