US 4,393,790 A · Safe door assembly

Abstract

A safe door assembly comprising a door casing, a door, a plurality of locking bolts operated by a combination lock so as to be selectively extended outwardly from or retracted inwardly into said door to lock or unlock, respectively, the door to the casing; the casing including a seat to accomodate a shoulder on a door and a recess to receive each of the outwardly extending locking bolts, the door having a combination lock with a retractable tongue directly connected to one locking bolt and also connected via a sliding link bar and lever means to the remaining locking bolts in such a fashion that all bolts extend and retract simultaneously; a pivotable relocking bar spring biased to pivot into a position which prevents movement of the sliding link bar and thereby prevents retraction of the locking bolts when the combination lock is displaced inwardly from its normal position; the assembly also comprising a hardened steel barrier protecting the outer extremities of said locking bolts from access by a drill, a hook means of attachment of one locking bolt to the tongue of the combination lock, and weakened handle support bolts which will shear in the shank portion when subjected to the normal torque or unloosening the bolt from its lock nut. The safe door assembly of this invention provides an improved protection against unauthorized tampering.

Claims25

Dependent claims

In a safe door assembly comprising a door casing, a door, a plurality of locking bolts operated by a combination lock so as to be selectively extended outwardly from or retracted inwardly into said door to lock or unlock, respectively, said door to said casing;

said casing including a seat to accommodate a shoulder on said door and recess to receive each of said outwardly extended locking bolts;
said door also including a combination lock with a retractable tongue operatively connected to a sliding link bar with lever means to simultaneously extend or retract said locking bolts;
the improvement comprising a pivotable relocking bar spring biased to pivot into a position whereby a portion of said bar mates with a corresponding portion in said link bar to prevent said link bar from sliding, said relocking bar positioned to mate with said link bar when said combination lock is disposed inwardly from its normal position;
a hardened steel barrier separating the mechanism of said combination lock from the outside wall of said door;
and a plurality of bolts through the outer wall of said door and through said hardened steel barrier fastened with lock nuts and supporting a handle for moving said door away from said casing, said bolts being weakened in their shank portions to shear off the head of the bolt if subjected to the torque normally required for unloosening said bolt from its lock nut.

2 more elements

In a safe door assembly comprising a door casing, a door, a plurality of locking bolts reciprocally movable outwardly to mate with a recess in said door casing, and a combination lock operatively connected with said locking bolts to selectively cause outward or inward movement of said bolts, respectively, to lock or unlock said door;

the improvement which comprises a reciprocable tongue attached to said combination lock said tongue moving linearly outwardly and inwardly, respectively, to lock and to unlock said safe, said tongue having a transverse slot at the outer end thereof to fit with a hook-shaped end of one of said locking bolts;
said tongue also having a pin extending laterally therefrom to fit into a corresponding hole in a slidable link bar to which are connected lever means to cause all other locking bolts to move simultaneously with the movement of said locking bolts with the hook-shaped end;
and two bolts through the outer wall of said door and through a hardened steel plate interiorly adjacent said outer wall fastened at the inside of said plate with lock nuts and supporting a handle for moving said door away from said casing, said bolts having a head with a weakened shank portion immediately adjacent said head to cause shearing of the bolt when subjected to a torque normally required to unloosen said bolt from said lock nut;
said bolts also having adjacent said weakened shank portion a shoulder portion of larger diameter than all other shank portions of said bolt and of appropriate size to fit into a counterbore in said outer wall.

1 more element

Dependencies are inferred from the claim text.

Safe door assembly

Life of this patent

Safe door assembly

Life of this patent

Abstract

Claims25