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US 4,056,276 AGranted
Door lock
OwnerKenneth W. Jarvisinventor
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OwnerKenneth W. Jarvisinventor
Estimating the term…
A door lock device suitable for operation with electrically operated means, which in turn can be actuated by magnetic card, special turn key, or a key punch combination for security purposes. If desired the lock device may be operated with a suitable mechanical or key lock mechanism. The door lock comprises a pivoting latch dog or bolt which is triggered to a locked position upon closing of a door. The pivoting dog or bolt is controlled by a toggle linkage which can be positioned near, on, or over-center to hold the door positively locked against external pressure. Means are provided for releasing the toggle linkage, even under loads against the door, by force directly applied to the toggle linkage between the end pivots of the linkage, and in addition springs are provided for moving the latch dog to an open position positively once the toggle linkage has been released. As the linkage is released the latch bolt moves the door to an ajar position.
A door lock device for use with a door frame member and movable door member comprising a housing mountable in one of said members, the other of said members having a receptacle in an edge adjacent said lock device, a latch bolt pivotally mounted to said housing about a generally upright axis when installed, said latch bolt being pivotally movable from a retracted position to a locked position, means associated with said latch bolt operable to cause pivoting of said latch bolt as a door to be latched is moved toward a closed position whereby portions of said latch bolt protrude from said housing and into the receptacle in said other member, an elongated tension coil spring means having one end connected to said housing and the other end connected to said latch bolt and urging said latch bolt to retracted position, toggle linkage means mounted inside said housing including a first link pivotally mounted to said latch bolt at a position spaced from the pivot between said latch bolt and said housing and a second link, pivot means pivotally mounting said second link to said first link at an opposite end of said first link from the pivot mounting to said latch bolt, and said second link also being pivotally mounted to said housing at an opposite end thereof from its pivotal mounting to said first link, said toggle linkage means being in a folded position when said latch bolt is in an unlatched position, and moving to a locked position wherein the pivot axis formed by the pivot means between the first and second links is generally adjacent to a plane defined by the pivots between the first link and the latch bolt and the second link and the housing to resist pivoting of said latch bolt from its latched to its unlatched position from loads on the latch bolt, and actuator means including an actuator member movable from a first position to a second position, and to exert a mechanical force on said toggle linkage means at a location between the pivot of the second link to the housing and the pivot of the first link to the latch bolt when the linkage is in locked position and to mechanically move said toggle linkage means toward folded position and permit the latch bolt to move to unlatched position.
A door lock device for a door comprising a housing, a latch bolt pivotally mounted to said housing about a first axis when installed, said latch bolt being movable about said first axis from a retracted position to a locked position, means cooperating between said lock device and a door with which it is to be used to cause pivoting of said latch bolt to latched position as said door is moved toward a closed position, toggle linkage means mounted inside said housing including a first link pivotally mounted to said latch bolt about a second axis positioned spaced from the first axis, and a second link pivotally mounted about a third axis to said first link adjacent an opposite end of said first link from said second axis, and said second link also being pivotally mounted to said housing about a fourth axis at an opposite end thereof from the third axis, said pivotal mounting between said first and second link being unconnected to said housing, said toggle linkage means being in a folded position when said latch bolt is in an unlatched position, and movable to a position wherein the third axis is in locked position adjacent a plane defined by the second and fourth axes to resist the pivoting of said latch bolt from its latched to its unlatched position from external forces on said latch bolt, spring means connected between said latch bolt and said housing tending to pivot said latch bolt towards its unlatched position, and actuator means including an actuator member mounted on said housing and mechanically engaging said toggle linkage means at a location between the second and fourth axes and being movable to a release position wherein the actuator member forces said third axis mechanically away from said plane a sufficient distance to permit said toggle linkage means to fold and to permit said spring means to move said latch bolt to unlatched position against resistance of movement of said door.
A door latch device comprising a housing, a latch bolt mounted in said housing and movable from a retracted position to a locked position, toggle linkage means mounted inside said housing for controlling movement of said latch bolt including a first link pivotally mounted to said latch bolt and a second link, pivot means pivotally mounting said second link to said first link at an opposite end of said first link from the pivot mounting to said latch bolt, means to mount said second link to said housing at an opposite end of the second link from its pivotal mounting to said first link, said toggle linkage means being in a folded position when said latch bolt is in an unlatched position, and moving to a locked position with said latch bolt in latched position, actuator means connected to said toggle linkage means for moving said toggle linkage to folded position, said actuator means including a member mechanically supporting the toggle linkage means in its locked position to prevent folding movement, said actuator means first moving said member away from position supporting said toggle linkage means when the actuator means is actuated to fold said toggle linkage means.
Dependencies are inferred from the claim text.