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A lock mechanism incorporating a coupling device through which rotation of a lock plug is transmitted to a bolt actuating shift, and which readily allows for interchangeability of key removable locking cores of different axial lengths in a door knob in any of a plurality of different positions of ro

A lock mechanism incorporating a coupling device through which rotation of a lock plug is transmitted to a bolt actuating shift, and which readily allows for interchangeability of key removable locking cores of different axial lengths in a door knob in any of a plurality of different positions of rotation of the lock plug.

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In a lock mechanism of the type having a rotatable plug member with front and rear ends, and a bolt actuating shaft coaxial with the plug member and having a forward end portion adjacent to the rear of the latter, means for transmitting rotation of the plug member to the bolt actuating shaft, charac

In a lock mechanism of the type having a rotatable plug member with front and rear ends, and a bolt actuating shaft coaxial with the plug member and having a forward end portion adjacent to the rear of the latter, means for transmitting rotation of the plug member to the bolt actuating shaft, characterized by: A. said forward portion of the actuating shaft having opposite flatted sides that are parallel to one another along an elongated portion of the shaft; B. an annular coupling member seated on said elongated portion of the shaft and having an axial hole therethrough, opposite side walls of which are flat and slidingly engaged with said flatted sides of the shaft to constrain the shaft to rotate with the coupling member while allowing the latter to slide axially along said elongated portion of the shaft; C. means to yieldingly urge the coupling member against the rear of the plug member, comprising a coiled spring encircling said flatted portion of the shaft and bearing against the coupling member; D. and means maintained operative by said spring for connecting said plug and coupling members for rotation in unison, comprising a pair of diametrically opposite lugs on one of said last named members, and crossing diametrical slots on the other of said last named members in which said lugs can be held engaged by said spring in either of two positions of relative rotation of said plug and coupling members placed 90°apart.