US 5,722,704 A · Multi-point door lock

Abstract

A door lock has a latch which is rotatable from a retracted position to an extended position by means of a linkage. A safety button extends from the latch when the latch is retracted. The linkage cannot be moved unless the safety button has been pressed, which occurs when the door is adjacent the door frame. This prevents the latch from extending and so damaging the keeper in the door frame. The linkage also has a notch which cooperates with a tang projecting from the housing. The tang an notch prevent the latch from being rotated from the extended position to the retracted position except by operation of the linkage. This feature makes it difficult to force the lock open without a key. In addition, one or more remote locks may be added to the main lock. With two remote locks it is possible to provide three anchor points for a door. Further, the remote locks are individually adjustable so that the reach of the latches can be varied to suit the configuration of the door frame or door, and so to accommodate irregularities due to installation or warpage. One of the remote locks can rotate in the opposite direction from the main lock so that the door cannot be lifted off its track.

Claims46

Dependent claims

A lock assembly for securing a door to a door frame, said assembly comprising

a latch moveable between a retracted position in which the door is free to be opened or closed and an extended position in which the latch engages the door frame to hold the door closed,
an input member movable from a first position to a second position to move the latch to the extended position,
a linkage connected between the input member and the latch, the linkage having a first position in which it blocks transmission of motion from the input member through the linkage to the latch and a second position in which the motion of the input member is transmitted through the linkage to the latch, and
an engagement button positioned to contact the door frame as the door is approaching the closed position, the engagement button being connected to the linkage to cause the linkage to move from its first position to its second position when the door reaches the door frame.

1 more element

A lock assembly for securing a door to a door frame, said assembly comprising

a latch moveable between a retracted position in which the door is free to be opened or closed and an extended position in which the latch engages the door frame to hold the door closed,
an input member moveable from a first position to a second position to move a latch to the extended position,
a linkage connected between the input member and the latch, the linkage having a first position in which it blocks transmission of motion from the input member through the linkage to the latch, and a second position in which the motion of the input member is transmitted through the linkage to the latch, and an engagement button positioned to contact the door frame as the door is approaching the closed position, the engagement button being connected to the linkage to move the linkage from its first position to its second position when the door reaches the door frame,
the input member being rotatable about a first fixed axis and including a crank pin offset from the axis of rotation of the input member, said linkage being connected to the crank pin,
the latch being rotatable about a second fixed axis between its retracted and extended positions,
the linkage including a link extending between the crank pin and the latch, the assembly including a housing, the housing having journals to define the first fixed axis of rotation of the actuator and the second fixed axis of the latch, and wherein the linkage includes a moveable pin, and a recess in the link for receiving the pin, the pin being in the recess when the linkage is in the first position so as to block transmission of motion of the input member to the latch, and the pin being free of the recess when the linkage is in the second position so as to permit the linkage to transmit motion of the input member to the latch.

3 more elements

A lock assembly for securing a door to a door frame having a generally vertical frame member and first and second keepers mounted to the frame member, said lock assembly comprising

a main lock mounted to the door and having
a main latch moveable between an engaged position in which the main latch engages the first keeper in the door frame to hold the door in a closed position and a retracted position in which the main latch is free of the first keeper and the door is free to move with respect to the door frame,
an input member,
a main linkage between the input member and the main latch, the input member being moveable to cause the main linkage to move the main latch between the engaged and retracted positions,
a remote lock having a housing mounted to the door
a remote latch moveable between an engaged position in which the remote latch engages the second keeper in the door frame to hold the door in a closed position and a retracted position in which the remote latch is free of the second keeper and the door is free to move with respect to the door frame,
a latch adjuster movably mounted to the housing, said remote latch being movably mounted to the adjuster,
a positioner connected between the latch adjuster and the housing to select the relative positions of the remote latch and housing so as to select the position of the remote latch in the engaged position with respect to the door, and
a remote linkage connected between the main lock and the remote lock to operate the main and remote latches in synchronism, and
wherein the housing includes a pivot pin and the adjuster is pivotable about the pivot pin.

7 more elements

A lock assembly for securing a door to a door frame having a generally vertically frame member and first and second keepers mounted to the frame member, said lock assembly comprising

a main lock mounted to the door and having
a main latch moveable between an engaged position in which the main latch engages the first keeper in the door frame to hold the door in a closed position and a retracted position in which the main latch is free of the first keeper and the door is free to move with respect to the door frame,
an input member,
a main linkage between the input member and the main latch, the input member being moveable to cause the main linkage to move the main latch between the engaged and retracted positions,
a remote lock having
a housing mounted to the door
a remote latch moveable between an engaged position in which the remote latch engages the second keeper in the door frame to hold the door in a closed position and a retracted position in which the remote latch is free of the second keeper and the door is free to move with respect to the door frame,
a latch adjuster movably mounted to the housing, said remote latch being movably mounted to the adjuster,
a positioner connected between the latch adjuster and the housing to select the relative positions of the remote latch and housing so as to select the position of the remote latch in the engaged position with respect to the door, and
a remote linkage connected between the main lock and the remote lock to operate the main and remote latches in synchronism, and
the main lock including an engagement button positioned to contact the door frame as the door is approaching the closed position,
the engagement button being connected to the linkage to move the main linkage from its first position to its second position when the door reaches the door frame, the button being connected to the main latch, and
wherein the main linkage includes a moveable pin, and a recess in the link for receiving the moveable pin, the moveable pin being in the recess when the linkage is in the first position so as to block transmission of motion of the input member to the latch, and the moveable pin being free of the recess when the linkage is in the second position so as to permit the main linkage to transmit motion of the input member to the main latch.

10 more elements

A lock assembly having

a housing,
an actuator mounted to the housing for rotation about a first center or rotation,
a latch rotatably mounted to the housing for rotation about a second center of rotation, the latch having a finger for engaging a keeper in an associated door frame and being rotatable about the second center of rotation between an extended position to engage the associated keeper and a retracted position in which the finger is free of the keeper,
a link connecting the actuator and latch,
a first pivot connection between the actuator and the link and a second connection between the link and the latch, the second connection being a lost motion connection which enables both relative rotation and limited translation between the link and the latch,
the actuator being rotatable in opposite directions about the first center of rotation between an open position and a closed position to cause the latch to move between its retracted and extended positions, respectively,
a stop element mounted to the housing and a bight formed in the link adapted to receive the stop element, the stop element being positioned and proportioned with respect to the actuator, link and latch so that when the latch is in the extended position, a force applied to the latch tending to rotate of the latch toward its retracted position moves the bight into interfering contact with the stop element and further so that when the latch is in the extended position, rotation of the actuator in a direction tending to cause the latch to rotate from its extended position toward its retracted position causes the bight to move away from the stop element.

4 more elements

Dependencies are inferred from the claim text.

Multi-point door lock

Life of this patent

Multi-point door lock

Life of this patent

Abstract

Claims46