Maximum security lock assemblies

Claim 2

A burglar-proof lock assembly for mounting on a door within a door frame having a strike mounted thereon provided with a pair of spaced apertured lugs projecting therefrom, comprising a. a lock case adapted to be mounted on said door provided with slots in alignment with said lugs for reception of said lugs in the closed condition of the door within said frame, b. a reciprocable locking bolt assembly in said case comprising a pair of coaxially disposed bolts for alternative engagement with the apertures in said lugs to interlock the door with the frame or disengagement from said apertures to permit the separation of said door from said frame, c. an actuating mechanism within said case connected to said bolts, d. an oscillating crank for operating said last-mentioned mechanism to control the positioning of said bolts relative to said slots in said lock case, e. a cylinder lock comprising an outer barrel containing a plurality of longitudinally arranged pin tumbler units, and an inner core having a keyhole at the outer end of said barrel and a tailpiece at the inner end thereof extending between said core and said oscillating crank, f. a tool-resistant armor-plate displaced from said casing for supporting said cylinder lock and concealing said cylinder lock and tailpiece, and g. a frusto-conical protrusion on the front of said armor-plate for protecting said lock against tampering and destruction, said armor-plate and protrusion having only a single opening of restrictd area constituted by a slot of restricted area, sufficient for the insertion of the shaft of the key adapted to be inserted in said keyhole and the rotation thereof in said core while covering the outer face of the cylinder lock at the points thereof vulnerable to the entry of drills or otHer lockpicking and tampering tools.

Claim 3

A device as set forth in claim 1, including a second armor-plate covering the side of said lock case remote from said first-mentioned armor-plate.

Claim 4

A device as set forth in claim 2, including screw fastening means for the strike on the door frame adapted to extend into the heavy timbers supporting said door frame, said fastening means being concealed by said lock case in the closed condition of the door.

Claim 5

A device as set forth in claim 3, wherein said screw fastening means comprises a plurality of wood screws ranging upwardly from two and one-half inches in length extending into the framing timbers from two transverse directions.

Claim 6

A device as set forth in claim 1, including a protective enclosure of tool-resistant metal between said armor-plate and lock case surrounding said cylinder lock and tailpiece.

Claim 7

A device as set forth in claim 5, wherein said protective enclosure comprises one cylindrical tube having one end projecting from the interior of said protrusion and a second cylindrical tube, of slightly different diameter from said first tube, having one end projecting from said lock case, with the opposite free end of each cylindrical tube disposed in overlapping telescopic relation.

Claim 8

A device as set forth in claim 1, including means for integrating said armor-plate with said lock case comprising a plurality of bolts integrally connected to the inner face of said armor-plate and extending through the door into said lock case, with fastening nuts on said bolts acting against the inner wall of said lock case.

Claim 9

A device as set forth in claim 3, including means for integrating said first-mentioned armor-plate with said lock case comprising a plurality of bolts integrally connected to the inner face of said armor-plate and extending through the door into said lock case, with fastening nuts on said bolts acting against the inner wall of said lock case, said lock case and second armor-plate extending beyond the area of attachment between said first armor-plate and lock case for engagement with the lugs of the strike in the closed condition of the door, in which position said screw fastening means are covered by said case.

Claim 10

A device as set forth in claim 8, wherein said lock case is of rectangular prismatic section defined by four rectangular walls projecting from the inner wall of said case, and said second armor-plate is detachably connected to the outer edges of said walls.

Claim 11

A device as set forth in claim 9, wherein the upper and lower walls are provided with guide tracks at the outer edges thereof and reentrant flanges on the upper and lower edges of said second armor-plate for engaging said guide tracks for slidable movement thereon.

Claim 12

A device as set forth in claim 10, including a J-shaped extension on said second armor-plate for encasing the outer lateral wall of said case and the exterior of the inner wall of said case adjacent thereto, and fastening bolts between the latter and said extension adjacent the free extremity thereof for fixing said second armor-plate in closed position on said case, said last-mentioned fastening bolts also being concealed at said strike.

Claim 13

A device as set forth in claim 11, wherein said J-shaped extension is provided with slots complementing the slots in the lock case for receiving the lugs of the strike in the closed condition of the door within the frame.

Claim 14

A device as set forth in claim 7, wherein the displacement of the tool-resistant armor-plate from said casing corresponds to the thickness of the door through which extend said plurality of bolts interconnecting said armor-plate and said lock case.

Claim 15

A burglar-proof lock assembly for mounting on an inwardly opening door within a door frame having a strike mounted thereon provided with a pair of spaced apertured lugs projecting inwardly therefrom, comprising a. a lock case adapted to be mounted on the inner side of said door provided with slots in alignment with said lugs for receptiOn of said lugs in the closed condition of the door within said frame, b. a reciprocable locking bolt assembly in said case comprising a pair of coaxially disposed bolts for alternative engagement with the apertures in said lugs to interlock the door with the frame or disengagement from said apertures to permit the separation of said door from said frame, c. an actuating mechanism within said case connected to said bolts, d. an oscillating crank for operating said last-mentioned mechanism to control the positioning of said bolts relative to said slots in said lock case, e. a cylinder lock comprising an outer barrel containing a plurality of longitudinally arranged pin tumbler units, and an inner core having a keyhole at the outer end of said barrel and a tailpiece at the inner end thereof extending between said core and said oscillating crank, f. a tool-resistant armor-plate displaced outwardly from said casing a distance corresponding substantially to the thickness of the door for supporting said cylinder lock and concealing said cylinder lock and tailpiece, g. a frusto-conical protrusion on the front of said armor-plate for protecting said lock against tampering and destruction, said armor-plate and protrusion having only a single opening of restricted area constituted by a slot of restricted area, sufficient for the insertion of the shaft of the key adapted to be inserted in said keyhole and the rotation thereof in said core while covering the outer face of the cylinder lock at the points thereof vulnerable to the entry of drills or other lock-picking and tampering tools, h. a second tool-resistant armor-plate covering the side of said lock case remote from said first-mentioned armor-plate, and i. a mechanical actuator extending through said second armor-plate and terminating within said lock case in a second rotary crank for operating said first-mentioned actuating mechanism.

Claim 16

A burglar-proof lock assembly for mounting on an inwardly opening door within a door frame having a strike mounted thereon provided with a pair of spaced apertured lugs projecting inwardly therefrom, comprising a. a lock case adapted to be mounted on the inner side of said door provided with slots in alignment with said lugs for receptiOn of said lugs in the closed condition of the door within said frame, b. a reciprocable locking bolt assembly in said case comprising a pair of coaxially disposed bolts for alternative engagement with the apertures in said lugs to interlock the door with the frame or disengagement from said apertures to permit the separation of said door from said frame, c. an actuating mechanism within said case connected to said bolts, d. an oscillating crank for operating said last-mentioned mechanism to control the positioning of said bolts relative to said slots in said lock case, e. a cylinder lock comprising an outer barrel containing a plurality of longitudinally arranged pin tumbler units, and an inner core having a keyhole at the outer end of said barrel and a tailpiece at the inner end thereof extending between said core and said oscillating crank, f. a tool-resistant armor-plate displaced outwardly from said casing a distance corresponding substantially to the thickness of the door for supporting said cylinder lock and concealing said cylinder lock and tailpiece, g. a frusto-conical protrusion on the front of said armor-plate for protecting said lock against tampering and destruction, said armor-plate and protrusion having only a single opening of restricted area constituted by a slot of restricted area, sufficient for the insertion of the shaft of the key adapted to be inserted in said keyhole and the rotation thereof in said core while covering the outer face of the cylinder lock at the points thereof vulnerable to the entry of drills or other lock-picking and tampering tools, h. a second tool-resistant armor-plate covering the side of said lock case remote from said first-mentioned armor-plate, and i. a mechanical actuator extending through said second armor-plate and terminating within said lock case in a second rotary crank for operating said first-mentioned actuating mechanism.

Claim 17

A device as set forth in claim 1, applied to an inwardly opening door, including a. a second tool-resistant armor-plate covering the side of said lock case remote from said first-mentioned armor-plate, b. a chamber with a frusto-conical exterior in said second armor-plate on the inner face of the door in substantial alignment with said frusto-conical protrusion in said first-mentioned armor-plate, c. an indoor cylinder lock comprising an outer barrel containing a plurality of longitudinally arranged pin tumbler units and an inner core having a keyhole at the exposed end of said barrel and an oscillating crank connected to the inner end thereof for selective engagement with said bolt-actuating mechanism, d. said second armor plate having a keyhole slot of restricted area in the frusto-conical exterior of said chamber, said area being sufficient for the insertion of the shaft of the key adapted to be inserted in said keyhole on the inner face of the door, and the rotation thereof in said core, while covering the outer face of said last-mentioned cylinder lock at the points thereof vulnerable to the entry of drills or other lock-picking and tampering tools.

Claim 18

A device as set forth in claim 15, wherein the pin tumbler units in the first-mentioned cylinder lock range from six to twelve in order to render the lock less vulnerable to picking tools.

Claim 19

A device as set forth in claim 15, wherein the pin tumbler units in both of said cylinder locks range from six to twelve in order to render the lock less vulnerable to picking tools.

Claim 20

A device as set forth in claim 1, wherein said cylinder lock is provided with a row of auxiliary pin tumbler units displaced angularly on each side of said first-mentioned longitudinally arranged pin tumbler units.

Claim 21

A device as set forth in claim 18, wherein the pin tumbler units in the first-mentioned group range from six to twelve in order to render the lock less vulnerable to picking tools, and the auxiliary pin tumbler units in the angularly displaced rows are diminished by at least one, at leasT at one end of each row.

Claim 22

A device as set forth in claim 1, wherein the outer end of said cylinder lock is affixed within the interior of said protrusion rearwardly of the front face of the latter to form a space therebetween, at least one apertured plate therebetween being of special alloyed metal to supplement the protection against tampering with the lock.

Claim 23

A device as set forth in claim 1, wherein the key-opening in said armor-plate is restricted substantially to the keyhole in the core of the cylinder lock, leaving unexposed the areas adjacent to the core of special vulnerability to the destruction of the pin tumbler units by drilling or prying.

Claim 24

A device as set forth in claim 21, including a key bit with undercut indentations adjacent to the hand grip of the key to accommodate the outer face of said protrusion in the course of rotating the key.

Claim 25

A device as set forth in claim 22, wherein the outer face of said core of the lock is provided with sockets for receiving propulsion pins on the handgrip of the key to reenforce the coupling therebetween and to compensate for the undercut indentations in the key.