Abstract: A burglar alarm system mounted in a reinforced doorway and comprising a control circuit having a normally open switch point consisting of a flange projecting from the backer plate towards the striker plate of the door lock, the flange being out of contact with, but close to, a long latch bolt projecting into the latch bolt hole for locking the door, and a contact having an electrical polarity opposite to that of the backer plate. The contact extends towards, but is normally slightly spaced from, the flange whereby the switch point is open and the control circuit is not energized. Displacement of the latch bolt towards the flange by a burglar tool and resultant displacement of the flange towards the contact causes the flange to touch the contact and energizes the control circuit to set off the alarm.

Abstract: Improved safety device for installation on door jambs in hotels, motels and the like to prevent the use of shim-type devices for unauthorized entry into guest rooms, wherein the device comprises a right angled strip of metal, to be secured to the door jamb opposite the free end of the door when the door is in the closed position, the device having a portion adapted to lap against the outer side of the door, so as to provide maximum resistance to insertion of a shim or similar article between door and lapped portion, thus preventing penetration far enough to disengage the latch bolt from the striker plate aperture in which it is engaged in the normal, locked position.

Abstract: A guarded striker plate and guarded latch face plate set which provides for the use of the identical piece on either the door jamb or on the door. One embodiment uses an L-shaped configuration incorporating a one guard member. A second embodiment uses a Z-shaped member incorporating a two guarded member. Both the L and the Z configuration may also be employed singly or in pairs. In a final embodiment a Z configuration may be used on the door jamb and an L configuration can be used employed on the door providing for maximum security from unauthorized entry.

Abstract: A locking assembly for normally separable apertured structures which protect business fronts against burglary. The locking assembly includes a sturdy, straight pin which penetrates all apertures, and is part of a sturdy bracket which overlies a fixed standard or post. The arrangement is such as to permit a key operated locking device to lie flatly and directly upon the bracket so as to prevent removal of the bracket and its above mentioned pin. The overall arrangement is such as to guard against burglary by an unauthorized person using forceful tools, and to prevent access to the pin for the purpose of destroying or cutting it.

Abstract: A door frame comprising wood frame members including a strike jamb, a hinge jamb, and a header, said frame members each being recessed longitudinally to provide a rabbet having a major surface and a minor surface perpendicular to said major surface, a slot substantially coplanar with the major surface of said rabbet extending into a non-recessed portion of said member, and a substantially J-shaped metal frame reinforcing member having a major flange, a minor flange substantially parallel to said major flange, and a connecting web substantially perpendicular to said major and minor flanges, said minor flange engaging the major surface of said rabbet and extending into said slot, and the major flange of said reinforcing member extending in engagement with the outer surface of said member.

Abstract: A door lock guard attachment for use with a door frame and a door provided with a lock having a movable bolt. The lock guard attachment comprises a one piece, elongate L-shaped member having a mounting flange for attachment to either the door or the door frame, and an integral, abuttment flange for abutting a stop rail on the door frame. The inner face of the mounting flange has a plurality of longitudinally and laterally disposed inwardly projecting teeth for impeding the passage of a burglary tool between the door and the door frame.

Abstract: A shield is provided for installation on double-hung windows to prevent the window lock from being jimmied open from the outside. The shield is a flat plate which is fitted to the top of the lower sash at the base of the lock and spans between the two lock sections to close the space between the two windows. The shield prevents the lock from being opened by means of a thin blade, or the like, inserted up between the two window sashes to disengage the lock.

Abstract: A security device is provided for installation on double hung windows to prevent the window lock from being jimmied open from the outside and to tighten the windows sashes to the frame as well as to each other when locked. The device is in the form of a generally flat plate or shield that is installed under the window latch and is formed with a pair of fingers which extend across the gap between the upper and lower sashes on either side of the keeper. Reentrant openings are formed from the edge of the shield to allow easy installation and a central portion of reduced thickness introduces a slight tilt to the latch to provide an improved locking grip with the keeper.

Abstract: A safety installation for locking and unlocking motor vehicle doors which includes an actuating knob arranged on the door inner side; the actuating knob is thereby constructed as sliding knob arranged on the top side of the windowsill.

Abstract: Disclosed is a security astragal for double door assemblies which includes a gear-toothed rod rotatably mounted in the meeting edge of one of the doors, and a rod-engaging blade mounted on the meeting edge of the other door. Both the rod and the blade preferably extend for the full height of the door. When the doors are swung relative to each other, the blade engages the teeth on the rod and rotates the rod sufficiently to enable the blade to move partly or fully past the rod. When the doors are in closed position, the blade and rod are in gear-like interengagement, making it impossible to insert a coat hanger or other jimmying tool between the two doors for manipulating the latch mechanism on the inside of the doors.

Abstract: Disclosed herein is an improved door strike noteworthy in its ability to resist forced entry when disposed upon a door. The structure includes a member adapted to be inserted in the doorjamb and its associated studs having a cylindrical tang for deep insertion therein, a body portion having a hollowed rectanguloid configuration with a tapered curvilinear top surface attached to the tang, and on the side opposite the tang connected to the body portion is a cylindrical disk portion hving a semi-circular step upper portion remote from the tang with a groove and a lip to allow registry with the mating jimmey proof door piece which has an upstanding projection fashioned to fit in the lip and groove of the security device.

Abstract: For use with a reciprocating latch bolt or plunger having a transversely disposed slot, a thin elongate plate designed to fit in the usual space between the door edge and the frame and to engage in said slot to prevent the retraction of the latch bolt from the frame keeper, the latch bolt slot being of a width to accommodate the thickness of the plate. In a preferred embodiment the plate is made of 18 or 20 gauge sheet metal which is sturdy enough to restrain the retraction of the latch bolt yet thin enough to fit in the normal door-to-frame clearance dimension and on removal from the latch bolt to be carried in one's wallet or purse. The plate may be provided with a latch accommodating perforation near each end, with one of said perforations having a side opening thereto whereby the plate at this end is in the form of a hook, and each perforation has an inwardly extending projection or tab selectably engageable in said latch bolt slot.

Abstract: A security lock guard adapted to engage a sliding bolt and to be mounted overlying the recess on the door jamb consisting of a flat plate having an opening corresponding with said recess to receive said bolt, said opening being provided with a plurality of removable tabs so as to accommodate the width of differently sized bolts; and a flange extending outwardly and perpendicularly from the outer edge of said flat plate and in contact with the inner surface of the door stop disposed on the door jamb. This perpendicular flange acts as a barrier against the insertion of a thin blade or other object between the door edge and the jamb even if the door stop is lifted or removed from the door jamb.

Abstract: A door lock guard comprising two cooperating guard plates, the guard plates preferably having identical configurations, the first plate capable of being mounted on the edge of a door and the second plate capable of being mounted on the doorjamb which receives the door. Each guard plate includes a support plate having a generally rectangular shape and including a cutout which allows for the protrusion of either a latchbolt plate or a strike plate. A pair of flanges extend respectively in opposite directions from opposite edges of the support plate. Preferably, the flanges are perpendicular to the support plate. One of the flanges includes an aperture for receiving a tongue and the other flange includes a tongue which extends in generally parallel relation to the support plate.

Abstract: A burglar alarm system is mounted in a doorway framing which comprises a reinforcement metal plate extending over a substantial portion of the wall studs and a substantial portion of one minor face of the door jamb, which plate is securely affixed to the wall stud and the minor door jamb face to cover a substantial region of the minor door jamb face adjacent and beyond the door latch bolt hole in the side rail. The alarm system comprises a pair of elongated copper sheets insulated from the metal plate and arranged between the plate and the minor door jamb face. The copper sheets extend side-by-side along a major portion of the reinforcement plate and are insulated from each other. The copper sheets are connected to an electric control circuit energizable to set off a burglar alarm and energized upon electrical contact being made by the sheets through a metal burglar tool used in an attempt to jimmy the door.

Abstract: The protector includes a generally U-shaped main body portion engageable with the major circumference of one or more door frame support members. A perpendicular flange portion projects from one terminal portion of the main body portion for engagement with a portion of the door frame which will be subjected to splitting forces during an attempt at forcible entry. A coplanar extension of the other terminal portion of the main body portion forms an anchor. The protector thus can serve as a combination anchor-door frame protector, or as a door frame protector alone. In the latter instance, the extension and adjacent segment of the main body portion may be eliminated.

Abstract: Burglary-resistant apparatus for denying access to door locks through a door crevice is adapted for mounting on a doorjamb adjacent one or more door locks and comprises a vertically elongate blocking plate disposed over the crevice between the doorjamb and a door, which includes flat surface portions extending over marginal portions of the door and substantially into a groove within the doorjamb thereby making it especially difficult to gain access to the crevice by circumventing the blocking plate. A vertically elongate locking plate has one vertical edge thereof secured to the blocking plate and extends perpendicularly therefrom to form a rigid structural unit having a generally T-shaped cross section.

Abstract: A device for rendering a spring-loaded, sliding bolt lock resistant to tampering comprises a sheet form member which can be mounted between the door stile and the door jamb and is formed with slots so that when a strip of pliable material is inserted between the door stile and the door jamb at a position spaced from the lock and is moved towards the lock, the leading edge of the sheet engages one of the slots in the member.

Abstract: Improved lock blocking plates and door jamb striker plates for use with entrance doors, the plates being utilized to prevent forcing or jacking open of dead bolt or spring bolt latches, together or singularly, while preventing inclement weather elements including rain water and wind from being received into the space existing between the door end face and the door jamb. The invention includes several alternate embodiments for uses with single doors that open in or out and double doors and provide for rain drainage, wind and rain deflection and a guard plate to prevent unauthorized opening of a dead bolt or spring latch bolt found in conventional doors and door jambs. Also included in the improvements is a downward and outward angularly formed top guard plate edge which allows rain water which might otherwise seep into the locking mechanism to drain outwardly and downwardly for preventing moisture in the lock operating mechanism.

Abstract: An anti-theft clip for securing a conventional lock cylinder to a car door and for preventing unwanted tampering with a lever operatively connected to the lock cylinder. The clip includes resilient legs which straddle and hold the lock cylinder. Panels attached to the resilient legs shield the lock cylinder from unwanted tampering.

Abstract: A latch shield for covering a latch assembly and preventing opening of the latch assembly from outside of a closure associated with the latch assembly. The shield has a hollow interior arranged for receiving the latch asembly and is attached to a stationary frame of the associated closure for spanning the gap between the stationary frame and a movable element of the closure when the movable element is in a position blocking access through the closure in order to prevent a tool inserted through the gap from releasing the latch assembly and permit opening of the closure.

Abstract: A shield is provided for installation on double-hung windows to prevent the window lock from being jimmied open from the outside. The shield is a flat plate which is fitted to the top of the lower sash around the base of the lock and spans between the two lock sections to close the space between the two windows. The shield prevents the lock from being opened by means of a thin blade, or the like, inserted up between the two window sashes to disengage the lock.

Abstract: A formed block of metal, plasic, or other suitable material, shaped to adhesively abutt the bevelled face of the bolt of a springlatch door lock, changing it from prism to rectangular shaped parallelpiped.

Abstract: A door is secured against being kicked in by a doorway construction which comprises a conventional wooden door frame side rail defining a door latch bolt hole in a recessed end portion of one of its major faces and a conventional wall including two-by-four studs adjacent the other major face of the door frame side rail, with the minor faces thereof extending parallel to the wall. The weak point of such a frame is in the region of the hole and this is protected by a reinforcement plate extending over a substantial portion of the wall studs and a substantial portion of the minor face of the door frame side rail overlying the hole. The plate is securely affixed to the wall studs and the door frame side rail and covers this region.

Abstract: Apparatus for securing the latch bolt of a conventional door lock against unauthorized withdrawal including a pin assembly provided with a handle, wherein the pin assembly can be alternately stored in a retainer plate or secured thereby in a locked position. More specifically the retainer plate includes an opening conformed to receive the pin of the pin assembly, said opening being aligned with a bore extending through the door into the latch bolt. Adjacent the opening there is provided in the retainer plate a storage hoop which is conformed to function both to store the pin assembly and to secure the handle when inserted.

Abstract: An electric strike type door lock in which the strike tongue is releasably held in its latch bolt securing position by a ball seated in a bore in a wall of the housing in which the strike tongue is mounted. Toggle linkage holds the ball in an operative position projecting from the mouth of the bore and into a pocket in the adjacent surface of the strike tongue, when the toggle linkage is in an extended condition with its knee joint slightly across dead center. A low powered solenoid operatively connected with the knee joint of the toggle, initiates collapse of the toggle and thereby enables the ball to be expelled from the pocket in the strike tongue by door opening force transmitted through the latch bolt onto the strike tongue.

Abstract: In a latch guard which has a mounting flange mountable in overlying relation to the inner face of a jamb in the vicinity of keeper means located on the jamb, and a blocking flange integrally fixed along one edge of the mounting flange substantially at right angles thereto, the improvement wherein a portion of the blocking flange projecting along and beyond the full length of a recess formed in the mounting flange in a direction away from a door has a plurality of toothed segments formed therein. The latch guard further includes a conductive plate which lies in the second plane paralleling the first plane and is normally spaced therefrom in a direction away from the door. At least one non-conductive compression spring is interposed between the plate and the blocking flange to urge the plate in a direction away therefrom. The stop and the jamb are formed with first and second recesses, respectively to receive blocking flange, the spring and the plate.

Abstract: A door lock strike guard is for use with a door jamb having a strike pocket therein and overlying a frame member. The guard itself is a flat metal bar having at one end a panel adapted to be disposed at one side of the strike pocket and having at the other end a leg adapted to be driven into a bore in the frame member. Between the panel and the leg there is an offset strap so that the leg is well displaced from the edge of the frame member. A lateral force on the strike pocket wall, normally borne only by the part of the jamb bounding the strike pocket, is additionally borne by the panel and at least in part is transferred to the frame member. In a modification, a screw regulates the penetration of the leg into the bore.

Abstract: A child-resistant lock means characterized in that a latch, switch, or like operating member therein adapted to be actuated by the tip of the forefinger is located at the end of an angular passage so that said operating member is inaccessible for operation by the forefinger of a child. The lock means herein is further characterized in that there is a lateral projection thereon adjacent the open end of the angular passage to prevent actuation of the operating member by a slender elongated object such as a stick or pencil.

Abstract: A door latch mechanism including a latch bolt to be movably carried by the jamb of the door and yieldingly urged to an active position, and a keeper carried by the door and constructed to deflect the latch bolt during closing movement of the door, with a retracting part also being carried by the door and operable to engage and retract the jamb-carried latch bolt to free the door for opening movement.

Abstract: A burglar-proof protector for locks mounted on doors having a cover enshrouding the lock and secured to the door with an opening in the center of the cover for receiving a key to permit actuation of the lock. A plate member is secured to the jamb of the doorway adjacent the cover to prevent manipulation of a tool between the cover and the jamb whereby the jamb may be damaged and the bolt retracted without the use of a key.

Abstract: A metal reinforcing plate is arranged beneath the usual striker plate in a routed recess of the wooden door jamb. The reinforcing plate has integral anchoring prongs which are driven into the wooden jamb immediately ahead of the stop rail and has additional anchoring and locator tabs which are received at the side walls of the bolt receiving recess or socket in the door jamb. The reinforcing plate is substantially concealed from view while imparting to the door structure substantial extra strength against forceable entry.

Abstract: A security device for preventing unauthorized separation of a door from a cooperating buck assembly, in which first and second plate members are respectively carried by the door and the buck assembly and cooperate with each other to prevent movement of the door in a lateral direction when the door is closed. The first plate member is of unique configuration and is arranged to interlock with adjoining structure on the second plate member to keep the door from moving in its plane. In certain embodiments a Z-shaped support element separate from the plate members is mounted on the buck assembly in juxtaposition with the second plate member, and in some cases either the first plate member or the second plate member includes a pivotally supported cam element which moves into cooperating relationship with the other member as the door reaches its fully closed position.

Abstract: A latch for use with a door knob lock for contact with a corresponding opening formed in a door jamb consisting of a bolt having a beveled surface along its closing edge and including a slot defined by a first side wall substantially perpendicular to the axis of the bolt and formed adjacent to the edge of the door, a second spaced-apart wall formed within the bolt and within the door jamb recess and a base surface interconnecting the two walls together. The intersection between the second wall and the base surface preferably defines a notch having an acute angle. The base surface is preferably inclined with respect to the axis of the bolt so that its intersection with the first wall forms an acute angle. The slot formed in the bolt is capable of catching any flat instrument which is inserted between the door and the door jamb to prevent unauthorized entry.

Abstract: A lock guard attachment for a door mounted lock having a movable latch bolt, the guard attachment comprising: a generally U-shaped channel, adapted to fit over a vertical edge portion of the door, having a base provided with a latch bolt receiving opening therein and opposed flanges on the base for bearing against opposite sides of the door to inhibit access of the bolt to burglars.