US 4,333,324 AGranted

Spring/dead bolt lock assembly

AssigneeNorris Industries, Inc.

InventorsHagen Dietrich, William J. Fane

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Abstract

One part of a key-in-knob lock set functions in a normal manner such that when the lock set is unlocked, either the outside or inside knob can be manipulated to open the door by withdrawing the latch bolt from a normal spring latch extended position. When, instead, the lock set is locked, the latch bolt is extended an exceptionally long distance into the frame to a dead bolt position. Extension and retraction of the latch bolt to and from dead bolt position is accomplished by manipulation of a main cam through the agency of a key in the outside or a turn button on the inside. For withdrawing the latch bolt from the normal spring latch extended position, an escutcheon housing for the outside knob or a corresponding escutcheon housing for the inside knob serves, by moving transversely of the axis of rotation of the knob, to rotate a radially extending tooth-like element on the spindle which, acting through the main cam, withdraws the latch bolt. By rotation of the key on the outside, or the turn button on the inside, the spindle is rotated a greater amount, far enough to have the main cam extend the latch bolt an additional distance to the dead bolt position. In that dead bolt position the tooth-like element for the hub cam of the outside knob is moved out of the path of movement of the respective drive housing so that rotation of the outside knob has no effect on the latch bolt. The tooth-like element for the hub cam of the inside knob remains, however, in movable engagement with the corresponding drive housing so that rotation of the inside knob does in fact withdraw the latch bolt from the dead bolt position.

Claims10

Dependent claims

A door lock acting as a combination spring latch and dead bolt comprising a latch bolt subassembly with a cam engaging means thereon and adapted to move between a partially extended spring latch position, a dead bolt position, and a withdrawn position, said subassembly comprising a latch bolt, a bolt extension and a case extension in longitudinal alignment, latch bolt actuating means comprising a spindle means and a main cam member on said spindle means having an operating engagement with said cam engaging means, a key actuated outside operating assembly including a spring latch release member in operating relationship with said spindle means, an inside operating assembly including a spring latch release member and a turn member in operating relationship with said spindle means, outside driving means adapted to engage said spindle means for driving said spindle means in a rotating direction, an outside drive housing having an outside drive element thereon in a transversely reciprocating path of movement and adapted to engage said outside driving means, and a rotatable drive member between said outside spring latch release member and said outside drive housing, an inside driving means adapted to engage said spindle means for driving said spindle means in a rotating direction, an inside drive housing having a transversely reciprocating path of movement and having an inside drive element thereon in continuous progressive engagement with said inside drive means, and a rotatable cam drive member between said inside spring latch release member and said inside drive housing, a clear way between said outside drive housing and said outside drive means when said latch bolt subassembly is in dead bolt position whereby the outside spring latch release member is free of operating engagement with said spindle means when the latch bolt subassembly is in dead bolt position.

Dependencies are inferred from the claim text.