US 6,557,909 B2 · Mortise lock

Abstract

A mortise lock is provided which includes a casing having a front plate for confronting a door frame and a pair of opposed side walls, the front plate having an opening for a latch bolt. A latch bolt is movable with respect to the casing between an extended position and a retracted position by a linkage connected to a hub to receive a door handle shaft, the latch bolt is rotatable axially, and the hub is rotatably secured between the opposed side walls of the casing. A slider plate for initiating movement of the linkage is provided that is movable from a first position wherein the linkage moves the latch bolt to the retracted position to a second position wherein the linkage moves the latch bolt back to the extended position. The slider plate has a preset adjuster, adjustable through at least one access aperture in the casing. An adjustable spring is included to urge the slider plate in a direction away from the hub to cause the slider plate to move to the second position and an access aperture is included in the casing to facilitate access to the adjustable spring.

Claims16

Dependent claims

A mortise lock, comprising:

a) a casing having a front plate for confronting a door frame and a pair of opposed side walls, said front plate having an opening for a latch bolt;
b) a latch bolt movable with respect to said casing between an extended position and a retracted position by a linkage connected to a hub adapted to receive a door handle shaft, said latch bolt rotatable axially, said hub rotatably secured between said opposed side walls of said casing;
c) a slider plate for initiating movement of said linkage, movable from a first position wherein said linkage moves said latch bolt to the retracted position to a second position wherein said linkage moves said latch bolt back to the extended position, said slider plate having a preset adjuster, adjustable through at least one access aperture in said casing;
d) an adjustable spring to urge said slider plate in a direction away from said hub to cause said slider plate to move to said second position;
and
e) an access aperture in the casing to facilitate access to said adjustable spring.

3 more elements

A mortise lock, comprising:

a) a casing having a front plate for confronting a door frame and a pair of opposed side walls, said front plate having an opening for a latch bolt;
b) a latch bolt movable with respect to said casing between an extended position and a retracted position by a linkage connected to a hub adapted to receive a door handle shaft, said latch bolt rotatable axially, said hub rotatably secured between said opposed side walls of said casing, said hub having a main body and a first and a second hub wing extending from said main body;
c) a slider plate for initiating movement of said linkage, movable from a first position wherein said linkage moves said latch bolt to the retracted position to a second position wherein said linkage moves said latch bolt back to the extended position, said slider plate having an upper member and a lower member, said upper member having an adjustable portion thereon to adjust preset in one direction, said adjustable portion adapted to contact said first hub wing when said hub is rotated in a counterclockwise direction, said lower member having a second adjustable portion thereon to adjust preset in another direction, said second adjustable portion adapted to contact said second hub wing when said hub is rotated in a clockwise direction, rotation of said hub in either a clockwise or counterclockwise direction causing substantially identical movement of said slider plate to cause said latch bolt to retract and extend;
and
d) at least one spring to urge the slider plate in a direction away from said hub to cause said slider plate to move to said second position.

2 more elements

A mortise lock, comprising:

a) a casing having a front plate for confronting a door frame and a pair of opposed side walls, said front plate having an opening for a latch bolt;
b) a latch bolt movable with respect to said casing between an extended position and a retracted position by a linkage connected to a hub adapted to receive a door handle shaft, said latch bolt rotatable axially, said hub rotatably secured between said opposed side walls of said casing, said hub having a main body and a first and a second hub wing extending from said main body;
c) a slider plate for initiating movement of said linkage, movable from a first position wherein said linkage moves said latch bolt to the retracted position to a second position wherein said linkage moves said latch bolt back to the extended position, and wherein rotation of said hub in either a clockwise or counterclockwise direction causes substantially identical movement of said slider plate to cause said latch bolt to retract and extend;
d) an adjustable spring to urge the slider plate in a direction away from said hub to cause said slider plate to move to said second position, and
e) an access aperture in the casing to facilitate adjustment of said adjustable spring.

2 more elements

A mortise lock, comprising:

a) a casing having a front plate for confronting a door frame and a pair of opposed side walls, said front plate having an opening for a latch bolt;
b) a latch bolt movable with respect to said casing between an extended position and a retracted position by a linkage connected to a hub adapted to receive a door handle shaft, said latch bolt rotatable axially, said hub rotatably secured between said opposed side walls of said casing, said hub having a main body and a first and a second hub wing extending from said main body;
c) a slider plate for initiating movement of said linkage, movable from a first position wherein said linkage moves said latch bolt to the retracted position to a second position wherein said linkage moves said latch bolt back to the extended position, said slider plate an upper slider plate leg and a lower slider plate leg, said upper slider plate leg having an adjustable block thereon to adjust preset in one direction, said adjustable block adapted to contact said first hub wing when said hub is rotated in a clockwise direction, said lower slider plate leg having a second adjustable block thereon to adjust preset in another direction, said adjustable block adapted to contact said second hub wings when said hub is rotated in a counterclockwise direction, rotation of said hub in either a clockwise or counterclockwise direction causing substantially identical movement of said slider plate to cause said latch bolt to retract and extend;
d) an adjustable spring to urge the slider plate in a direction away from said hub to cause said slider plate to move to said second position, said adjustable spring comprising a floating spring adjuster plate having a threaded hole therein, a spring adjusting screw to be received between said threaded hole and said casing and at least one spring between said floating spring adjuster plate and the slider plate, wherein rotation of said screw within said threaded hole causes the distance between said spring adjuster plate and said front plate of said housing to change;
and
e) an access aperture in the casing to facilitate adjustment of said spring adjusting screw;
whereby spring force on said slider plate is dependent upon positioning of said spring adjuster plate with respect to said front plate.

4 more elements

Dependencies are inferred from the claim text.

Mortise lock

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Mortise lock

Life of this patent

Abstract

Claims16