Abstract: A security lock comprising a latch positioned at the edge of a door which is actuated to selectively lock or unlock the door. The security lock includes an optional key-actuated dead bolt which can provide additional security when needed. A mechanism for locking or unlocking the latch comprises a hand-actuated knob positioned on the inside of the door so that when the dead bolt is not in use, the latch mechanism may still be locked or unlocked simply by rotating the knob between two positions. The mechanism for locking the latch is disengaged when the latch is in the locked position. If the latch is in the locked position when the door is opened, when the door is closed the latch is automatically unlocked to prevent a person from accidentally being locked out.

Abstract: A lockset assembly which includes a bolt (12) movable between a partially extended latching position and a fully extended dead bolt position. When the bolt (12) is in the dead bolt position, the inside lever (10) can be used to retract the bolt. The outside operating assembly (27) is provided with a key operated lock cylinder (22) and the inside operating assembly (44) is provided with a turn button (26).

Abstract: A lock used for folding walls, doors and boards in which a bolt of the lock, moved in translation by a system, is joined at one end to the board and at the other end to the bolt. For keeping the bolt in its fully unlocked or fully locked position, the bolt has a leaf spring acting on the part of the system joined with the bolt so that the bolt and this toggle part are kept in an in-line position in the unlocked or locked condition of the bolt.

Abstract: An over-centered lock arrangement is provided for office furniture units, such as desks, credenzas and the like, that include one or more pedestals, having at least one closable compartment, in the nature of a drawer, a cabinet, et cetera, with a mechanism to lock the compartment closed, and a top extending the length of the unit. A primary lock is mounted in the unit, and includes lock tumblers mounted in a plug or cylinder, which is rotatable between the locked and unlocked positions. At least one lock slide is slidably mounted in the unit, and reciprocates to shift the compartment lock between locked and unlocked positions. The cam lock assembly includes a crank arm connected with the tumbler cylinder, and an actuator arm having opposite ends pivotally connected with the crank arm and the lock slide at first and second pivot points, whereby rotation of the tumbler cylinder reciprocates the lock slide.

Abstract: A rotatable crank hub has a crank arm slot pivotally connected to the rearward ends of a pair of driving levers, the forward ends of the driving levers being pivotally connected to a longitudinally slideable bolt. Rotation of the crank hub in opposite directions moves the bolt through the crank arm and driving levers forwardly to bolt extended position and rearwardly to bolt retracted position during which a transverse driving pin between the crank arm and driving lever rearward ends moves into forward vertical slots of the latch frame in the bolt extended position and into rearward vertical slots of the latch frame in bolt retracted position. A cam projection on the crank hub is slideably resiliently engaged at one side approaching and in bolt extended position and the other side approaching and in bolt retracted position by a forward leg of a U-shaped spring, a spring rearward leg being engaged with the latch frame.

Abstract: A door lock has a flush-mountable body. A forwardly facing recess is defined by the body. A paddle-type handle is pivotally carried by the body and is movable between a nested position within the body recess and an operating position. A spring-projected slide bolt is carried on the back of the body and is movable between projected and retracted positions. A key-controlled disconnect linkage is provided for selectively connecting and disconnecting the handle and the bolt. The disconnect linkage includes a disconnect member which is mounted for translatory movement along one side of the bolt to bring other disconnect components selectively into and out of driving engagement. A key-operated locking member moves the disconnect member between connecting and disconnecting positions. When the disconnect linkage drivingly connects the handle and the bolt, movement of the handle from its nested position to an operating position will cause corresponding retracting movement of the bolt.

Abstract: A door lock of the dead bolt type in which an eccentric cam on the inner end of a lock cylinder can be rotated to engage a deformation in a ring, causing the ring to rotate. A linkage connects the ring to a bolt so that rotation of the ring causes reciprocation of the bolt, the ring being concentric with and supported by the cylinder. An engagement portion of the ring that extends beyond the cylinder forms the deformation, preferably a recess, permitting the cam to engage and disengage the recess as it makes a complete revolution. The cam engages opposite ends of the recess to move the bolt in opposite directions. A spring, that can be disposed within the bolt, is used to bias the ring toward positions corresponding to extended and retracted positions of the bolt.A catch mechanism can be provided to engage a housing and resist movement of the bolt if the bolt is forced toward its retracted position.

Abstract: A lock mechanism is disclosed for use with sliding, swinging or overhead doors. A receiver is affixed to the door frame and a bolt, linkage and handle are affixed to the door. The linkage allows the bolt to engage the receiver by sliding along the receiver until it becomes latched so that the door may be closed though the handle is locked. Pulling upon the unlocked handle retracts the bolt from the receiver and also causes the door to start opening.

Abstract: A door lock including a bolt connected by a link to an actuator mechanism by which it is movable within a housing between a retracted position and an extended position. A pin and slot connection between the bolt and link form a coaction mechanism that causes a prong on the link to engage an abutment on the housing when a force is applied to the extended bolt in the direction of its retracted position. As the link pivots, a second abutment on the housing is engaged to further resist bolt movement. The force is then absorbed by the housing rather than the more fragile actuator mechanism. If the bolt is subjected to a force that would tend to pull it from the lock, the link engages another abutment on the housing to retain the bolt.The bolt is movable a short distance from its normal extended position by compressing a spring without transmitting to the link the force applied to the bolt. A hardened security pin within the bolt normally transmits the spring force to the link to avoid looseness.

Abstract: For translating the linear motion of a pivotally mounted thumb piece for a front door latch into the rotary motion needed to withdraw a latch bolt, two rotary members are employed. One is a bell crank having a pivotal mounting on the mounting plate at one side of and at right angles to the pivotal mounting of the thumb plate and rotationally responsive to linear motion of the thumb piece. The other is a drum having a rotatable mounting on the mounting plate parallel to and spaced from the bell crank pivotal mounting, and at a location adjacent a roll back of a latch bolt. A resilient connector strip from the bell crank to the drum causes the drum to be rotated in response to rotation of the bell crank. A torsion return spring attached to the drum acts to return the drum and the bell crank to their original positions.

Abstract: A door lock having a press button operable to retract the door bolt from its engaged to its released position, and a separate operating means to positively lock the bolt whereby the press button is raised or lowered from its normal position so as to serve as a visual signal indicating whether the bolt is locked or is free for normal retraction.

Abstract: A door lock having two escutcheon plates clamped against the sides of a door, two mortise cylinders mounted in coaxial relation in the escutcheon plates and each having a rotatable key plug and an actuating arm on the inner end of the plug, a bolt slidable between extended and retracted positions, and a toggle joint bolt-operating mechanism actuated by the actuating arms on the key plugs. This mechanism includes a bolt link pivotally connected to the inner end of the bolt, and an actuating link between the ends of the key plugs having abutment means for coupling and uncoupling of the arms and the actuating link which is urged in toward the locked and unlocked positions by a toggle spring movable into oppositely over-center positions. The abutment means comprise two spaced tabs defining a slot into which the actuating arm is eccentrically extended and retracted during rotation of the key plug through full locking and unlocking revolutions.