Importance

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Abstract

A cylindrical lock is provided for use in a door containing a latch bolt supported for movement between an extended door-latching position and a retracted door-unlatching position. The door further includes a latch bolt retractor assembly connected to the latch bolt and movable relative to the door to move the latch bolt between the extended door-latching position and the retracted door-unlatching position. The cylindrical lock includes a hub, a door handle, a spindle, and a locking lug. The hub is adapted to mount in a fixed position on the door and is formed to include a first hub slot and a second hub slot communicating with the first hub slot. The door handle is mounted for rotation relative the hub. The spindle is coupled to the door handle and is formed to include a spindle slot defined by spaced-apart driving surfaces. The locking lug is movable between a first position fixing the spindle and hub together and a second position uncoupling the spindle and hub. In the first position, the locking lug is positioned to lie in the first hub slot formed in the hub and the spindle slot formed in the spindle. In the second position, the locking lug is positioned to lie in the spindle slot formed in the spindle and the second hub slot formed in the hub. The locking lug is formed to include a frangible section through which the locking lug shears if overtorqued when in the first position.

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First Claim