Abstract: Latch mechanisms adapted to prevent unauthorized displacement of a latch bolt from an extended, locked position to a retracted, unlocked position. The latch mechanisms prevent the failure of a latch bolt of one latch mechanism to return to an extended lock position from interfering with the ability of a latch bolt of an inter-related latch mechanism from being able to return to an extended, locked position. Further embodiments provide a mounting bracket mounted to a door to allow the associated latch mechanism to be indirectly secured to the door. Additionally, the mounting bracket may have a plurality of mounting orifices that allow the mounting bracket to be used with a wide range of latch mechanisms, as well as provide adjustable attachment of the latch mechanism to the mounting bracket.

Abstract: An automatically locking sash lock for a double-hung window including a handle and cover affixed to the exterior of a lock housing that contains a bolt and a pair of plungers, each of which defines at least one end with a biased face. The bolt and plungers are in mechanical communication through a pair of couplings that define a longitudinal groove for receiving the plunger and a finger for engaging the bolt. A method of locking a window is also provided.

Abstract: A latch assembly with an anti-picking function includes a bracket mounted in a door and located at a top or bottom end of the door. A movable member is slideably received in the bracket. A lever is pivotably mounted in the bracket. A positioning member includes a first pivotal portion pivotably connected to the movable member. The positioning member and the movable member can move jointly. The positioning member further includes a second pivotal portion pivotably connected to the lever. When the lever pivots, the positioning member pivots and actuates the movable member to move, causing movement of a latch between a latching position and an unlatching position. When the latch is in the latching position, a lug of the positioning member abuts against the movable member to prevent the latch from moving from the latching position to the unlatching position by picking.

Abstract: A slidable device allows a door to be locked but prevented from latching into the doorjamb until a sliding mechanism releases the door latch.

Abstract: A tilt latch system that comprises an actuator movable from a first position to a second position; a lock-out member movable from a retracted position to an extended position upon movement of the actuator from the first position to the second position; and an engagement member movable from an engaged position to a disengaged position upon movement of the actuator from the first position to the second position is provided. The actuator and the engagement member are maintained in the second and disengaged positions, respectively, when the lock-out member is in the extended position. The actuator and the engagement member are automatically biased to the first position and the engaged position, respectively, upon movement of the lock-out member from the extended to the retracted position. The tilt latch system may further comprise a lock-out device and/or be optionally utilized in a modular configuration.

Abstract: An anti-opening apparatus locks a tray so as to prevent the tray from opening when impact such as head impact is applied to a crash pad. In the tray anti-opening apparatus, the tray is mounted so as to be pulled into or out of a housing fixedly coupled to a crash pad. A rotary bar is hinged to the housing at an intermediate portion thereof, extends toward the tray on one side thereof, extends in a direction which crosses the extension direction of one side thereof on the other side thereof, and is rotated such that one side thereof approaches one surface of the tray when impact is applied to the crash pad. A pin is coupled on one side of the rotary bar, and a free end of the pin is inserted into an insertion hole formed in the tray when the rotary bar is rotated.

Abstract: A mechanism for locking a door of an electric household appliance is improved in that a slider jaw is hinged to a body of a slider in such manner that, by its tooth, it snaps or releases a head of a latch and that the slider jaw is provided with an opening finger, and a mechanism housing is provided with a hindering element, which thrusts the opening finger of the slider jaw, when the slider moves in direction of the force of the spring, so that the slider jaw gets open. The slider body and the slider jaw are preferably made of different materials: the slider body of a polyoxymethylene copolymer and the slider jaw of a polyamide or of a ZL4 alloy having a composition Zn:A14:Cu1. The proposed mechanism is not susceptible to plastic deformation of the junction area between the slider body and the slider jaw.

Abstract: An electronic device with a holding mechanism is provided. The device includes a main body, a housing, a carriage, a first elastic member, a stopper member, a second elastic member, and a button. The housing includes a first sidewall, a second sidewall opposite to the first sidewall, and a third sidewall formed between the first sidewall and the second sidewall, an opening is defined in the second sidewall. The stopper member is slidably received in the housing and connected to the third sidewall. The carriage is slidably received in the housing and connected to the first sidewall. The ridge protrudes from the carriage and is capable of blocking a free end of the stopper member to retain the carriage in a retracted position. The button is slidably connected to the housing and includes a distal end, which engages with the stopper member.

Abstract: A positioning device for clipping apparatus includes a hollow body which has an open side on one side that holds a track portion and an anchor portion on another side. The body houses a sliding member having a clipping unit and a harness arm. The harness arm is connected to the track portion to form a displacement path of the sliding member. The clipping unit includes an upper clipping portion and a lower clipping portion. The upper clipping portion is driven by the sliding member to move close to the lower clipping portion. A linking means connects an elastic element to the anchor portion and the sliding member so that the elastic element can be stretched and retracted against the displacement path of the sliding member to provide a returning elastic force to the sliding member. Thereby the sliding member can be positioned rapidly on each displacement path.

Abstract: A vertical bolt mechanism and installation configuration that avoids damage to a door corner comprises a vertical bolt case of tubular shape and a horizontal tubular transfer case. The mechanism is substantially contained within the bolt case and transfer case. In the installation in a door, the bolt case and the transfer case require only two major holes in the door top and edge, each hole being well spaced from the door corner and the axis of each hold being directed perpendicular to the other. Installation requires insertion of the bolt case through the hole in the top of the door and the transfer case through the hole in the edge of the door. The two cases come together to form an L-shape within the door with the internal mechanism of each case joined in engagement. Routing or cutting out of the door at the corner is thus avoided.

Abstract: A load floor latch for securing a first closure member to a second closure member panel such that when the first and second closure members are fastened, the latch is opened by actuating the handle and the pawl is retracted into the latch. A biasing device such as a torsion spring acts on a locking arm so as to pivot the locking arm such that it engages a slot on the pawl. This maintains the pawl in the retracted position. When the first closure member to which the latch is attached is closed so as to bring the first closure member into a closed position with respect to the second closure member, a projection on the locking arm contacts a contact member such that the locking arm is pivoted and the locking arm no longer remains in the slot in the pawl. The pawl is then free to extend out of the latch to a latched position by the action of a compression spring and engage a keeper on the second closure member to thus fasten the first and second closure members.

Abstract: The present invention provides an electronic lock structured to include a first bolt configured with an elastic clasp, an electromagnetic device connected to an input device, a second bolt and a microswitch connected to a security system, all of which are installed interior of a housing of the electronic lock. The elastic clasp is retained by a protruding edge of the housing, thereby disenabling the first bolt from an arbitrary retracting movement that would otherwise render the lock incapable of being unlocked. The input device controls the electromagnetic device to induce the elastic clasp and release a retaining state, and then directly rotating a rotating button causes a retracting movement of the first bolt and unlocking of the electronic lock, which simultaneously disconnects the security system.

Abstract: A latch assembly includes a latch and a casing having a base integrally formed with outer walls, wherein a latch chamber is defined by the base and the outer walls. The casing securely retains the latch within the latch chamber and allows limited movement of the latch within the latch chamber during an impact. Thus, the latch may move within a storage bin door upon impact, thereby preventing unlatching.

Abstract: A closing device for an opening part of a piece of furniture comprises a magnetic detent for retention of the part in a closed position in combination with a thrust “pull-push” mechanism for detachment from the magnetic detent upon command, so as to cause opening of the opening part of the piece of furniture.

Abstract: A flush bolt includes a bolt head and a strike. The bolt head moves out of the flush bolt in response to movement of the strike into the flush bolt, through a movable cam surface in the flush bolt. The bolt head is withdrawn towards the flush bolt when the strike is released.

Abstract: A reversible latch assembly has a faceplate assembly, a latch bolt assembly, a bolt-releasing assembly, a guardian bolt assembly, a driver assembly and a casing assembly. The latch bolt assembly, the bolt-releasing assembly and the guardian bolt assembly are rotatably mounted inside the casing assembly and allow the latch assembly to be reversed and used in either a clockwise or counterclockwise opening door.

Abstract: An automatic locking window latch including a housing for holding a handle with a fully integrated bolt for securing a window, and a catch for engaging the window to release the bolt to secure the window, as well as to hold the bolt open to open the window. The catch may include a catch body, a spring guide, and a trigger pin. The spring guide slideably fits over a post attached to the housing for guiding the catch body and positioning a catch spring. In an unlocked position, an external force acting against the trigger pin causes the catch body to slide from between the bolt and a slide surface of the housing along the post. As the catch body moves past the bolt, bolt springs push bolt extensions of the bolt through the housing and into an adjoining window molding to secure the window. The catch spring presses the catch body against the bolt until the handle pulls the bolt from the locked position.

Abstract: A combined automatic latch and deadbolt assembly includes a latch configured to selectively assume a retracted and extended configuration and a deadbolt configured to selectively assume a cocked and a released configuration. The combined automatic latch and deadbolt assembly may be configured such that causing the latch to transition from its retracted configuration to its extended configuration causes the deadbolt to transition from its cocked configuration to its extended configuration.

Abstract: A slidable bolt assembly (4) having a tension spring (16) mounted to a slide bolt rod (5). The actuating lever (8) is adapted to be pivotally mounted and is hand-operated. The actuating lever (8) is attached to a leaf tension spring (16) at one end and securely fastened to a bolt rod (5) on the other. The bolt member (5) is projected and retracted within the door by pivotal action of the actuating lever (8). Because the slidable bolt assembly (4) is attachable to the front of a door, the assembly (4) may be used on either an active (2) or inactive (3) door. In addition, the decorative mounting plate (7) allows a user to tastefully protect his or her home or business from excessive force caused by winds, intruders or other undesirable elements and promotes safety by restricting unauthorized individuals from access into or out of a room.

Abstract: This latch device for an access panel door includes an open lever and a ratchet release lever pivotally mounted on a base plate by a first shaft, a lock lever pivotally mounted on the base plate by a second shaft, and a sliding pin displaceable between an engaged position and a disengaged potion. The release lever has first and second arms extending in a radial direction of the first shaft and connected to latch units. The lock lever shifts the sliding pin to an engaged position when the lock lever is in the unlocked position and shifts the sliding pin to a disengaged position when the lock lever is in the locked position. The sliding pin is slidably mounted in a slot formed on the first arm or the second arm.

Abstract: A latching apparatus for sliding windows or doors, comprising a striker and a latch assembly. The latch assembly comprises a support, a spring biased latch member slideably retained on the support and movable between a latching position in which it engages the striker and a non-latching position, a spring biased retainer connected to the support and movable between a retaining position in which it retains the latch member in the non-latching position and a non-retaining position in which it releases the latch member to move to the latching position. The retainer includes an actuating portion that is externally engageable by the striker as the frames of the closure are slid closed to move the retainer to the non-retaining position. An actuator is connected to the latch member by for returning the latch member to the non-latching position thereby freeing the frames and the retainer.

Abstract: An electronic door lock dogging mechanism is provided with a bolt arranged to move into and out of a door to selectively engage a portion of a door frame to lock a door when extending out of the door and when recessed within the door, unlocking the door from the door frame. A first mechanical element is arranged to normally bias the bolt outwardly relative to the door. A first electrical element is arranged, when energized, to move the bolt into a recessed position in the door to unlock the door. A second mechanical element is arranged to be biased into a dogging position relative to the bolt when the first electrical element has moved the bolt into its recessed position. A third mechanical element is arranged to engage the second mechanical element to move it out of the dogging position when the third mechanical element is moved into a first position. A fourth mechanical element is arranged to bias the third mechanical element into the first position.

Abstract: A lock has a lock casing and a spring-loaded trigger guided for reciprocating movement within the housing. A hook-like bolt is arranged within the housing to be movable between an unengaged position and an engagement position. In a first position, as support surface of the spring-loaded trigger retains the bolt in its unengaged position. In a second position the spring-loaded trigger releases the bolt for movement towards its engagement position.

Abstract: A self-latching lock (1) having a bolt (2), a catch (3), an auxiliary catch pin (4) and a reciprocator (5) includes a multi-part latch nut (6) that permits the deactivation of an nut-idling device (8) and thereby a temporary activation of the function of door handles preferably by electrically operated remote-controlled actuation. The latch nut (6) comprises an outer nut body (60) with two arms (61, 62) for operating the catch (3) and the bolt (2), respectively, as well as two hubs (63, 64) each connected with a square section of the outer and the inner door handle and coaxially and rotatably positioned parallel to each other inside the outer nut body (60). The nut-idling device (8) arranged between the hubs (63, 64) and the outer nut body (60) constitutes a coupling which by means of actuators (71, 72) permits disengagement for each hub (63, 54).

Abstract: A lock includes a quick unlocking device and a secondary locking device. Thus, when the inner handle is rotated, the latch bolt and the dead bolt are unlocked synchronously by operation of the quick unlocking device, so that the door plate can be opened rapidly, thereby facilitating the user opening the door during the emergency condition. In addition, when the locking block is pressed inward, the locking stud of the locking block is locked in the locking hole of the locking seat to lock the control knob on the locking seat without rotation, such that the dead bolt is fixed by the control knob, thereby forming a secondary locking effect to achieve the anti-theft purpose.

Abstract: An improved bolt dock for a door lock and particularly a bolt dock capable of locking automatically when the door is closed and preventing the bolt from deforming mainly consists of an upper bolt set and a lower bolt set covered by a lid to couple with an inner handle and an outer handle to be installed on a door. The bolt dock thus made can achieve safe locking and increase the durability of the door lock.

Abstract: A latching system for live bolts as in a door retains the live bolts within the door until the door is closed. A latch holds a live bolt link against travel that would insert the live bolts into the door body jamb until a link lifter forces the link out if the latch against the bias of a hold-down spring. The link lifter can take the form of an inclined surface on a cam mounted on the hinge side of the door. The cam engages the door body jamb as the door closes and travels into the door until the link lifter engages and lifts the link out of the latch.

Abstract: A lock mechanism is provided which may actuate both a deadbolt and flush bolts in response to a single lock movement. The mechanism includes a dual element bolt throw and flush bolt actuator, which locks in place in the extended position if the end of the bolt is pressed inwardly. The throw includes a transfer mechanism which translates the horizontal movement of the bolt to vertical movement at the flush bolts. The flush bolts also include a mechanism to limit retraction thereof if the extending end of the flush bolt is exposed to inward directed force. The entire lock mechanism may be actuated by a standard cylindrical lockset having actuating jaws extending therefrom. The lock mechanism case may include an aperture therein, through which the handle housing extends, which aligns the jaws in the handle housing with the rear end of the bolt.

Abstract: A door lock assembly includes a hollow casing, a latch, an actuator rod, and a drive mechanism. The casing has left and right side walls that are opposite to one another, and a rear wall interconnecting the left and right side walls. The left side wall has upper and lower openings formed therein. The latch is mounted movably in the casing in a latching direction between a latched position for allowing extension of the latch out of the casing via the upper opening and an unlatched position for allowing retraction of the latch into the casing. The actuator rod is disposed below the latch, and is movable in the casing along a direction parallel to the latching direction between an extended position outwardly of the casing via the lower opening and a retracted position. The actuator rod has an actuating element formed thereon, and a coiled spring for urging the actuator rod to the extended position.

Abstract: A mortise latch and exit device includes active and passive mortise latch mechanisms with corresponding concealed vertical rods operated by links mounted within the mortise latch mechanisms. The mortise latch mechanisms latch double doors at a center point between the doors and at top points between each door and the door frame. Lower vertical rods may also be used to latch at bottom points between the doors and the floor. The active and passive mortise latch mechanisms are operated by corresponding push handle mechanisms and rotary handles. The mortise latch mechanisms cooperatively interact so that either door may be opened first, and either door may be closed first, without regard to the position of the other door. The active mortise latch mechanism includes a latch bolt and an activation bolt arranged so that one bolt is retracted when the other is extended, except when the doors are being opened or closed, when both bolts are retracted.

Abstract: A deadbolt lock and a deadbolt which will extend automatically whenever a container is locked by virtue of a rigid portion of the container engaging a trigger element extending from the end face of the bolt and causing the release of an outer bolt portion is shown and described herein. The release of the outer bolt of the bolt assembly allows the outer bolt to project outwardly and to lock the container notwithstanding the fact that the bolt has not been reset by the operator of the lock. The bolt is self-contained and can be substituted into many existing lock mechanisms of the mechanical type and into some of the existing electronic dial combination locks, to provide the auto-locking enhancement.

Abstract: A latch mechanism for use with an oven having a door, the latch mechanism including a base plate which pivotably supports a latch member about a pivot point. The latch member is rotatable between a latched and unlatched position and includes a drive surface offset from the pivot point. An actuator pin is supported by the base plate for rectilinear movement wherein the actuator pin has an outer end extending beyond the base plate for engaging the oven door upon closure and an inner end drivingly engaging the drive surface for rotating the latch member into a latched position against a spring bias. The base plate is a molded plastic member having a boss including snap connection means for rotatably supporting the latch member and a sleeve for slidingly supporting the actuator pin for rectilinear movement. A solenoid is mounted to the base plate and has a locking pin selectably movable between an extended position and a retracted position.

Abstract: A door latch actuator operates a latch bolt assembly of a door. The door latch actuator employs a spring latch plunger and a dead latch plunger mounted in a housing that has a latch cavity sized to receive the spring latch bolt and the dead latch bolt pin. The spring latch plunger engages and retracts under the pressure of the spring latch bolt, and the dead latch plunger engages the dead latch bolt pin. A drive operates the plungers to first withdraw the dead latch plunger to allow the dead latch bolt pin to move to an enabling position for the spring latch bolt. Next, the drive advances the spring latch plunger and thereby the spring latch bolt in moved to a release position and the door may be opened. The drive is preferably a rotary drive using a motor driven crank and pin system. Sensors are provided to detect the position of the system. The method of the invention encompasses the operative steps of this door latch actuator, and the method can include timing steps.

Abstract: A push pad releasable exit device with continuous deadlocking for mounting near a door edge for engaging a lock strike includes a housing having first and second sidewalls upon which are mounted two end walls and an internal wall parallel to the end walls, each of the end walls and the internal wall having a hole, the holes being aligned on a common axis, the first sidewall having a wedge stop projecting inwardly therefrom toward the axis of the holes in the end walls and the internal wall; a tapered latch bolt mounted on a cylindrical shaft the shaft extending through the holes and having a provision for urging the latch bolt toward the lock strike; a wedge plate having a hole providing clearance around the shaft and aligned with the holes in the end walls, having a tab pivotally resting in a slot of the second wall, and having a corner distal from the tab resting against the wedge stop when the door is in an open position; a provision for sensing when the door is in a closed position and for flipping the we

Abstract: A lock mechanism is provided which may actuate both a deadbolt and flush bolts in response to a single lock movement. The mechanism includes a dual element bolt throw and flush bolt actuator, which locks in place in the extended position if the end of the bolt is pressed inwardly. The throw includes a transfer mechanism which transposes the horizontal movement of the bolt to vertical movement at the flush bolts. The flush bolts also include a mechanism to limit retraction thereof if the extending ends of the flush bolt is exposed to inward directed force. The entire lock mechanism may be actuated by a standard cylindrical lockset having actuating jaws extending therefrom.

Abstract: A door lock is disclosed having a slidable lock bolt with a latching device for releasably retaining the lock bolt in a position intermediate of extended and retracted positions for the lock bolt. The door lock may be used in combination with a remote lock operator and includes a retainer, which is slidably mounted in the lock bolt and which projects beyond the lock housing when the lock bolt is in the intermediate position, so as to be engaged with the remote lock operator and for holding the remote lock in its release condition. When the lock bolt moves to an extended position, the retainer will release the remote lock operator. There is a handle operated actuator rotatably mounted in the housing of the door lock. The actuator has two arms, respectively, to move the lock bolt from its extended to its intermediate position and, at the same time, to engage the remote lock operator for moving it to the remote lock release condition, where it can be engaged by the retainer.

Abstract: A multipoint lock assembly is provided for securing a sliding door in a tightly closed and locked condition. The multipoint lock assembly comprises a plurality of latch cartridges mounted at vertically spaced positions along a free side edge of a sliding door, wherein the latch cartridges each include a keyhole-shaped latch port and are movable together for engaging headed latch pins mounted on an adjacent door jamb. A main actuator cartridge is mounted on the door for moving the latch cartridges to an unlatched position to permit door movement to an open position in response to rotation of a door handle. A trigger assembly retains the latch cartridges in the unlatched position until the door is closed, at which time the trigger assembly releases the latch cartridges for spring-loaded movement to a latched position engaging the latch pins. A security deadbolt is also provided on the main actuator cartridge and can be thrown when the door is closed for positively locking the door.

Abstract: A multi-point door lock system comprising an active lock and an inactive lock for use on single or double doors is self-teaching, provides one hand control of shoot bolts, and provides audible and tactile feedback associated with shoot bolt extension and retraction.

Abstract: A latch assembly for use with a panic exit device, particularly a top latch having a U-shape which engages a stem portion of a T-shaped receiving lug mounted overhead to a top member of the door frame. The U-shaped top latch is pivotably mounted to the active stile of the door. The latch assembly causes the U-shaped latch to pivot upward to capture the stationary T-shaped receiving lug, or pivot downwardly to disengage from the T-shaped receiving lug. The latch member is in sliding and abutting engagement with two latch plates which slide in one direction to retain the latch member in a downward orientation to hold the latch in an open position, and slide in an opposite direction to allow the latch member to pivot upwardly upon engaging pressure by the strike. A wedge is caused to slide into blocking engagement with the latch when it is in the closed position.

Abstract: A latch assembly for a door movably mounted on a frame is disclosed together with its method of operation, the assembly including a housing mounted on the frame adjacent an opening for receiving the door, a first pin mounted in a first passageway of the housing with a spring biasing the first pin into extended locking engagement with the door, a second pin being mounted in a second passageway intersecting with the first passageway, a spring biasing the second pin into extension for opening the door from the frame, retainers being interconnected with the first and second pins for securing each pin in a retracted position when the other pin is extended so that the first pin positively locks the door in a closed position retracting the second pin and the second pin positively opens the door when the first pin is retracted by the actuator.

Abstract: Mortise lock has a guardbolt which, when depressed, moves a lever inside the lock. The end of the lever moves a vertically sliding interlock slide from a first position in which its fits in a recess in the deadbolt and blocks the throwing of the deadbolt, to a second position. In the second position the slide clears the recess and permits the deadbolt to be extended. This protects against the extension of the deadbolt unless the door is closed.

Abstract: A mortise lock assembly disposed within a housing for mounting in a door. The assembly includes a latch bolt and a dead bolt, both of which are movably mounted within the housing and reciprocal between an extended position cut out of the housing and a retracted position within the housing. The assembly also includes latch bolt and dead bolt biasing mechanism for continuously biasing the latch bolt and dead bolt to their extended positions. The assembly further includes a trigger movably mounted within the housing and a dead bolt stop element movable between a dead bolt engaged position and a released position for restraining the dead bolt in the retracted position against the biasing force of the dead bolt biasing mechanism.

Abstract: A suitcase lock comprises a manually operable actuator mounted in a bowed handle of a suitcase to actuate a guiding means which incorporates a combination lock and which in turn moves a release plate. The release plate has two opposite ends connecting with two locking means which are unlocked upon moving the release plate. The guiding means is provided with a means that prevents the suitcase lock from unlocking when the suitcase is not in a correct position.

Abstract: A lock assembly is provided which contains a spring-loaded dead bolt and a spring-loaded plunger intercoupled to one another. The assembly is such that when the door is closed, the plunger is pushed in by the striker plate on the door frame, and this releases the spring-biased dead bolt and causes the dead bolt to be fully extended into the cavity in the striker plate. When that occurs, the linkage coupling the assembly to the doorknob moves to a position in which one of its members serves as a stop to prevent the dead bolt from being forced back to a retracted position until the doorknob is turned.

Abstract: Peripheral locking system comprising a frame enclosing an aperture and a closure for the aperture having a polymeric member extending around a portion of the perimeter of the aperture and mounted in a track, designed to lock the closure at at least two points upon movement of the polymeric member.

Abstract: An automatic tubular deadbolt lock assembly having the automatic actuator mechanism enclosed within the tubular housing of the lock. The assembly is dimensioned like a standard tubular deadbolt, to fit within standard borings of present doors. A special quadrant trigger is mounted in and protrudes from the nose of the deadbolt, being pivotal into the deadbolt itself to an inactive recessed position upon opening of the door. With closure of the door, the trigger is cammed and depresses a camming plunger to release a transverse locking pin from engagement with the tubular lock housing, to thereby allow biased extension of the deadbolt from its retracted condition. The trigger can be rotationally reversed to accommodate left hand or right hand door arrangements.

Abstract: A deadbolt door lock assembly wherein the deadbolt is automatically mechanically actuated with door closure for security. Door closure actuates a trigger mechanism that releases a deadbolt restraining means to allow a biased deadbolt to be thrown to extended lock condition.

Abstract: A door locking device comprises a locking bolt movable from a retracted position within the door edge, to a projected position for locking the door within the door frame, and a feeler member engageable with the door frame when the door is in its closed position to automatically actuate the locking bolt to its projected position, and thereby to automatically lock the door in its closed position. The automatic locking of the door may be disabled either by the application of a proper key in the key cylinder, or by the depression of a foot pedal. The described embodiment includes two locking bolts both of substantial vertical length so that together they occupy at least 50% of the door height.

Abstract: To prevent costly damage to door frames and door bolting mechanisms caused by slamming of doors with security bolts projecting, a bolt immobilizing device automatic in its operation and biased toward the immobilizing position is installed on the door adjacent to the bolt. The device is moved to a bolt release position when the door is closed by engagement of an operator with the opposing stop surface of the door jamb. When the door is opened with the locking bolt retracted, the device returns automatically to the bolt immobilizing position. The device includes a shiftable blocking plate across the end face of the bolt in a plane perpendicular to the bolt axis.

Abstract: An improved door lock construction comprising a lock bolt formed in U-shape operable in association with an actuating mechanism, an interlocking device, a dog device and a hold-release device assembled in a box type housing to be mounted on the inner side of the door, capable of locking the door on closing and further locking with a key.