Lock core assembly for a cylindrical lock

Details Lock core assembly for a cylindrical lock Lock core assembly for a cylindrical lock

2000-03-01

2001-03-20

Barrett, Suzanne Dino (Department: 3627)

Locks

Special application

For control and machine elements

C070S373000

Reexamination Certificate

active

06202457

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a lock core assembly for a cylindrical lock, and more particularly to a lock core assembly that can be easily assembled to a knob of a cylindrical lock.
2. Description of the Related Art
U.S. Pat. No. 4,966,399 issued on Oct. 30, 1990 and entitled “LOCK SET WITH SPINDLE LOCK”, as illustrated in
FIG. 1
of the drawings as a prior art, discloses a cylindrical lock comprising a knob
90
with a spindle
91
and a lock core opening
92
. A lock core assembly
93
is mounted in the knob
90
and has an end
94
fitted in the lock core opening
92
. The lock core assembly
93
further has a protruded top portion
95
fitted in a slot
96
of the knob
90
. Since two ends of the lock core assembly
93
are respectively fitted in the lock core opening
92
and an end face
97
of the knob
90
and have straight lengths, the lock core assembly
93
falls into the knob
90
sometimes during assembly. More specifically, the lock core assembly
93
is completely inside the knob
90
in an undesired manner. Retrieval of the lock core assembly
93
is not only difficult but also time-consuming and sometimes may cause deformation of the knob
90
, resulting in a failed product.
SUMMARY OF THE INVENTION
It is a primary object of the present invention to provide a lock core assembly for a cylindrical lock for preventing unintentional falling of the lock core assembly into the knob. The subsequent retrieval problem is avoided accordingly.
A lock core assembly in accordance with the present invention includes a protruded top portion with lateral wings that are wider than a width of a slot in an end face of the knob, thereby preventing falling of the lock core assembly into the knob.
Other objects, specific advantages, and novel features of the invention will become more apparent from the following detailed description and preferable embodiments when taken in conjunction with the accompanying drawings.


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