Security door bolting mechanism

A latch bolt actuating mechanism for a door having a latch bolt mounted on its inner surface adjacent a top edge thereof in position to engage and cooperate with a fixed keeper above the door, the actuating mechanism comprising,

• elongated strap means having a top end connected to the latch bolt for vertical movement therewith, said strap means extending downwardly from said latch bolt in juxtaposition to said inner surface of the door and terminating in a bottom end,
• a rigid metal housing adapted to be releasably mounted on said inner surface of the door, said housing including a rigid metal channel having a bottom surface adapted to be mounted on said door inner surface, a pair of parallel laterally spaced sidewalls, and a removable cover mounted on said sidewalls and extending over said channel,
• a bolt actuator connected to said bottom end in said housing,
• shaft means extending through said housing and supporting said bolt actuator for pivotal movement about a horizontal axis parallel to said inner surface,
• biasing means in said housing continuously urging said actuator means and said strap means in a direction to engage said latch bolt with said keeper,
• said actuator including lever means extending from said housing in outwardly spaced relation to said inner surface in position to be pivoted about said shaft means toward and away from said inner surface, said lever means being operable upon movement toward said inner surface to move said strap means and said latch bolt connected thereto downwardly against the force of said biasing means to release the latch bolt from the keeper, and
• stop means for engaging said lever to limit the pivotal movement of said actuator to thereby limit the extent of downward movement of said strap means and said latch bolt, said stop means including lever engaging surfaces on said rigid metal housing.