Locks – Operating mechanism – Key
Reexamination Certificate
2003-02-11
2003-12-30
Gall, Lloyd A. (Department: 3676)
Locks
Operating mechanism
Key
C070S386000, C070S417000, C070S493000
Reexamination Certificate
active
06668607
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a lock core, particularly to one having a plurality of recessed holes bored in the recessed hollow of an upper lock cover for respectively receiving at least one steel ball therein. Thus, when a burglar employs an electric drill to break and unlock a lock by drilling through the keyhole of the lock, the steel balls in the recessed holes can stop the electric drill from drilling forward, having excellent effect of anti-theft.
2. Description of the Prior Art
A conventional lock core
1
, as shown in
FIG. 1
, is composed of a lower lock cover
10
, a lock plate
11
and an upper lock cover
12
. The lower lock cover
10
, the lock plate
11
and the upper lock cover
12
are respectively formed with a curved groove passage
13
matching with one another. The lower lock cover
10
is formed with a recessed hollow
14
at the upper portion and a keyhole
15
at one end. The upper lock cover
12
is bored with a plurality of pinholes
16
in the groove passage
13
for pins
17
to be respectively inserted therein. In assembling, the lock plate
11
is first deposited in the recessed hollow
14
of the lower lock cover
10
and then the upper lock cover
12
is covered on the lock plate
11
, letting the groove passage
13
of the lower lock cover
10
, the plate
11
and the upper lock cover
12
aligned to one another. Lastly, a clasp
18
is engaged in the corresponding clasping holes
19
respectively provided at the opposite ends of the lower and the upper lock cover
10
,
12
to finish assembly of the lock core. However, such a conventional lock core
1
is easy to be broken by an electric drill, which a burglar employs to drill through the keyhole
15
of the lock.
SUMMARY OF THE INVENTION
The objective of invention is to offer a lock core able to guard against being broken by an electric drill drilling through the keyhole of a lock.
The feature of the invention is that an upper lock cover has its recessed hollow provided with a plurality of recessed holes respectively fitted therein with at least one steel ball.
REFERENCES:
patent: 3130573 (1964-04-01), Hines
patent: 3429154 (1969-02-01), Schwartz
patent: 3531959 (1970-10-01), Weber
patent: 4078406 (1978-03-01), Genakis
patent: 5086632 (1992-02-01), Hsu
patent: 5131247 (1992-07-01), Hsu
patent: 5475997 (1995-12-01), Chung
patent: 5671623 (1997-09-01), Hsu
patent: 5893284 (1999-04-01), Hrabal
patent: 3503154 (1986-08-01), None
patent: 470155 (1914-06-01), None
patent: 1545294 (1979-05-01), None
patent: 164985 (1990-06-01), None
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