A locking mechanism for a swinging door movable between a door closed position and a door open position and including a latch, the locking mechanism including a bolt housing, a movable bolt slidably mounted in the bolt housing, the movable bolt having a first end and second end, and a spring mounted in the bolt housing between the bolt second end and a portion of the bolt housing and biasing the bolt towards the bolt first end. The locking mechanism also includes a locking plate having a hole therein, the locking plate being slidably mounted in the bolt housing and movable between a bolt unlocked position where the locking plate hole is aligned with the bolt so that the bolt can move freely towards the bolt second end, and a bolt locked position where the locking plate hole is not aligned with the bolt and where the bolt movement toward the bolt second end is limited. The locking mechanism also includes a locking plate moving mechanism for moving the locking plate between its bolt locking position and its bolt unlocked position, the latch engaging the bolt first end and preventing the door from opening if the latch and the bolt first end cannot move past one another.

A sliding latch replaces a prior art door strike plate. The sliding latch has two components, a strike plate and a sliding latch cover reciprocal within the strike plate. A handle protrudes from the sliding latch cover sufficiently to extend beyond a closed door and door frame, to permit the handle to be manually grasped and lifted in a crisis. When the sliding latch cover is thus elevated, it no longer blocks the door bolt, allowing the bolt to extend farther and engage with the strike plate and extend into the door jamb, locking the door. One of the strike plate mounting screw holes is preferably drawn slightly out of the primary plane of the strike plate toward the jamb, and a pair of elevated distally located edges run longitudinally along the strike plate. The drawn screw hole and raised edges guide and limit motion of the sliding latch cover.

Some embodiments of the invention include a locking mechanism for a sliding barn door. The locking mechanism, for example, may include a lock mechanism. The locking mechanism may include a base configured to couple with a sliding barn door; an external handle; a connecting rod having a proximal end and a distal end, the proximal end of the connecting rod coupled with the external handle; a latch mechanism coupled with the connecting rod; and a locking mechanism disposed within the external handle. The locking mechanism may be configured to lock the external handle from rotating relative to the base such that when the locking mechanism is in a locked configuration the external handle and the rod do not rotate relative to the base, and when the locking mechanism is in an unlocked configuration the external handle, rod, and locking mechanism rotate relative to the base.

Some embodiments may also include a locking mechanism for a barn door, the locking system comprising: a locking mechanism body; a lock chamber configured to slide into the locking mechanism body in a locked configuration, and configured to slide out of the locking mechanism body in a first direction in an unlocked configuration; and a locking pin coupled with the lock chamber, the locking pin configured to slide outward in a second direction opposite the first direction in the locked configuration, and configured to slide inward in the unlocked configuration.

A two point lock for securing bi-folding windows and doors in which upper and lower shoot bolt arms move in opposite directions from a central lock body upon rotation of a handle. When the arms are in their mutually extended positions, a sliding detent locking member engages the upper shoot bolt arm to secure the window or door in the closed position. The central lock body includes a rotating driver for the shoot bolt arms that is supported at both ends and is maintained in two different positions by interaction with the curved contact faces of a set of biasing pads.

A door lock system comprising a first rotary configured to control extension and retraction of the deadbolt via a primary cam mechanism; a second rotary control configured to control extension and retraction of the latch; and a link configured to retract the deadbolt in response to operation of the second rotary control when the latch is retracted by the second rotary control. The link is configured to move along a linear path normal to the movement of the deadbolt and the door latch and to contact the primary cam mechanism upon the link movement to affect deadbolt retraction and extension. A lever may be used to retract the latch in response to rotation of the first rotary control in a first rotational direction when the deadbolt is retracted by the first rotary control.

A dual interlock system for electrical equipment enclosures having at least two isolated compartments. The interlock includes a dual function interlock mechanism that prevents a serviceable equipment compartment door from being opened while a local disconnect device located in an adjacent isolated compartment is in the ON state. The dual interlock system also prevents the local disconnect device from unintentionally being moved from an OFF state to the ON state while the serviceable equipment door is open.

An auto-latching latch assembly (10) is mounted to a follower door (275) of a double door (257). The latch assembly (10) includes a latch (231) movable between an unlatching position and a latching position and a movable member (50) jointly movable with the latch (231). A positioning member (911) is jointly pivotable with the movable member (50). When the latch (231) moves to the unlatching position, the positioning member (911) positions the latch (231) in the unlatching position. When the follower door (275) is closed while a primary door (259) of the double door (257) is closed, an actuation latch (131) presses against and releases the positioning member (911) to move the latch (231) to the latching position, reliably locking the follower door (275).

A multipoint door lock system for a door having on its edge a deadbolt and a secondary bore is disclosed. The system includes a door frame. A pivotable latch mounted in the door frame has a door-locking tip that enters the secondary bore of the door when the door is closed. Insertion of the deadbolt in a bolt opening of the door frame causes a lever to move from a resting position, displacing a translating member mounted in the door frame to an extended position. A distal end of the translating member enters a recess of the pivotable latch, locking the pivotable latch. The system may include a pair of translating members and a pair of pivotable latches having door-locking tips entering corresponding secondary bores of the door. A combination of the multipoint door lock system with the door is also disclosed.

A door lock system comprising a first rotary configured to control extension and retraction of the deadbolt via a primary cam mechanism; a second rotary control configured to control extension and retraction of the latch; and a link configured to retract the deadbolt in response to operation of the second rotary control when the latch is retracted by the second rotary control. The link is configured to move along a linear path normal to the movement of the deadbolt and the door latch and to contact the primary cam mechanism upon the link movement to affect deadbolt retraction and extension. A lever may be used to retract the latch in response to rotation of the first rotary control in a first rotational direction when the deadbolt is retracted by the first rotary control.