Positive locking device

Claim 1

A locking device adapted for use with lightweight structures and doors, comprising: a bar-locking assembly having a first back plate arranged to be mounted to the outer side of a structure; and a first mounting plate arranged to be mounted to the inner locking side of the structure; a bar-support sleeve affixed to said mounting plate, said bar-support sleeve including a pair of aligned holes therein, and said bar including a pair of aligned holes therein, whereby said holes of said sleeve and said holes of said bar are in respective alignment with each other when said bar is in a locked position; a slidable, elongated, locking-bar member slidably supported in said support sleeve, said bar member including a plurality of pairs of enlarged aligned holes adjacent one end thereof; an adjusting-head means mounted to said elongated bar to extend the length of said bar, said head means comprising a bolt member threaded to one end of said bar and having an engaging head formed thereon; a bar-receiving frame section, including a second back-plate member adapted to be mounted to the outer side of a structure, and a second mounting plate adapted to be mounted to the inner locking side of the structure; a keeper-sleeve member affixed and positioned on said second mounting plate in longitudinal alignment with said bar, said keeper having an open end to receive said bar and an oppositely disposed closed end defined by a wall, to limit the movement of said bar for engagement with said adjustable head means; means comprising a plurality of bolts having tamperproof heads formed thereon, for mounting said plates to said structure, said heads being positioned on the outside of said structure; a releasable-latching means mounted to said first mounting plate and adapted to be received into said selected enlarged pair of holes when said locking bar is in a locked position, said releasable-latching means including a releasable pin to engage said enlarged holes in said bar.