US 5,125,696 AGranted

Cylindrical lock assembly

AssigneeEmhart Inc.

InventorsJames E. Robida, Kenneth W. Strickland

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Abstract

A cylindrical lock assembly (20) includes an inside subassembly (22) and an outside subassembly (24) which are assembled with a door (326). Each subassembly (22,24) includes a rose liner (26,38), a return spring cassette (28,40), a rose (30,42), a lever (32,46) and a lever insert (34,48). The inside subassembly (22) also includes a turn button (36) and the outside subassembly (24) includes a cylinder lock (44). The subassemblies (22,24) are assembled onto respective sleeves (168,170) of a chassis (50) which facilitates the retraction of a latchbolt (54) upon operation of either of the levers (32,46). Cassettes (28,40) are mounted in the lock assembly (20) by a pair of screws with one screw being inserted from one side of the door (326) and the other screw being inserted from the other side of the door.

Claims9

Dependent claims

A cylindrical lock assembly, which comprises:

a latchbolt;
a mechanism for moving the latchbolt between a latched position and an unlatched position;
a pair of sleeves extending from opposite sides of the mechanism and attached thereto for operating the mechanism upon rotation of the sleeves;
a pair of operators mounted on the sleeves for facilitating selective rotation of the sleeves;
a pair of springs mounted on the pair of sleeves for developing a spring return force when the operators are moved from a home position to facilitate the return of the operators to the home position when the operators are released;
a first cassette means for supporting one of the pair of springs on either side of the door;
a second cassette means identical in structure to the first cassette means for supporting the other of the pair of springs on either side of the door;
each of the first and second cassette means having a housing formed with a well for receipt of a respective spring of the pair of springs;
means formed in the housing for attachment of a first end of the respective spring to the housing and mountable on a respective sleeve of the pair of sleeves;
and
an arbor formed with a flange having a radial slot therein for attachment to the second end of the spring and an axial opening with a groove formed therein for engagement with the sleeve.

8 more elements

Dependencies are inferred from the claim text.