Locks – Operating mechanism – Key
Reexamination Certificate
2003-06-03
2004-04-13
Gall, Lloyd A. (Department: 3676)
Locks
Operating mechanism
Key
C070S386000, C070S404000, C070S419000
Reexamination Certificate
active
06718808
ABSTRACT:
BACKGROUND OF THE INVENTION
1) Field of the Invention
The invention herein relates to lock mechanisms, specifically an improved tubular-type locking cylinder and dedicated key having both theft- and trip-resistant tumbler pin assemblies.
2) Description of the Prior Art
A conventional tubular-type locking cylinder
1
a
and key
2
a
is shown in FIG.
5
and FIG.
6
. The said conventional tubular-type locking cylinder
1
a
is typically comprised of an outer housing
11
, a main base
12
a
, a locking cylinder
13
a
, and a plurality of tumbler pin assemblies
14
, while the key
2
a
of the said conventional tubular-type locking cylinder
1
a
is of one-piece construction and comprised of a toggling barrel
21
and a handle
22
. The said toggling barrel
21
consists of a barrel member
210
having a plurality of arcuate unlocking notches
211
disposed along its outer rim, a locating element
214
extending outward laterally from the handle
22
member
220
at the said rim after the handle
22
is fastened to one side of the said rim, and, furthermore, an actuating element
213
facing inward. When the said key
2
a
is inserted into the entrance of the toggling barrel
21
, the actuating element
213
and the locating element
214
on the outer side are respectively aligned with the actuating element slot
133
(see
FIG. 6
) at the top extremity of the locking cylinder shaft
13
of the said tubular-type locking cylinder
1
a
and the locating slot
112
on the key entry hole
111
of the outer housing
11
and then pushed into the said tubular-type locking cylinder
1
a
(as shown in FIG.
7
), the plurality of arcuate unlocking notches
211
on the rim of the said toggling barrel
21
then contact the upper and lower pins
141
and
142
of the tumbler pin assemblies
14
at the lower extent of the locking cylinder
13
a
tumbler pin disc
131
and also moves against the upper extent of the main base
12
a
body
120
a
(as shown in FIG.
7
), at which time the handle
22
of the said key
2
a
is grasped by two fingers and rotated clockwise or counter-clockwise such that the said key
2
a
unlocks the said tubular-type locking cylinder
1
a.
Generally speaking, the said conventional tubular-type locking cylinder
1
a
has no drawbacks during the unlocking operation. However, since the plurality of tumbler pin assemblies
14
between the tumbler pin disc
131
of the locking cylinder
13
a
and the body
120
a
of the main base
12
a
lack any anti-theft device, an ordinary thief can easily obtain a tube having a wall thickness of approximately 0.2 mm to 0.4 mm and an inner diameter equal to the that of the key
2
a
toggling barrel
21
, slip a rubber sleeve tightly over the exterior wall of the said tube to fix a number of wire segments or half-length toothpicks equal in quantity to that of the said tumbler pin assemblies
14
and insert this into the said conventional tubular-type locking cylinder
1
a
in place of the key
2
a
to forcefully unlock the said conventional tubular-type locking cylinder
1
a
within five seconds. As such, the prior art is merely an average, low-price, and imprecise locking device that is not equipped with a means of theft prevention. Additionally, since the said conventional tubular-type locking cylinder
1
a
has no anti-theft device or locking cylinder
13
a
securing device, when utilized as a lock under vibrational conditions, vibrations readily rotate the locking cylinder
13
a
against the main base
12
and trip the said tumbler pin assemblies
14
, causing the said conventional tubular-type locking cylinder
1
a
to malfunction or become damaged such that it is inoperable.
Based on many years of professional engagement in the tubular lock manufacturing industry, the applicant of the invention herein addressed the installation and utilization shortcomings of the conventional tubular-type locking cylinder
1
a
by conducting research and testing that culminated in the successful development of the improved tubular-type locking cylinder and dedicated key of the invention herein.
SUMMARY OF THE INVENTION
The objective of the invention herein is to provide an improved tubular-type locking cylinder and dedicated key that has theft- and trip-resistant tumbler pin assemblies, the detailed description of which is presented after the brief description of the drawings below.
REFERENCES:
patent: 3961507 (1976-06-01), Falk
patent: 4012931 (1977-03-01), Harunari
patent: 4450697 (1984-05-01), Ellis
patent: 4621510 (1986-11-01), Scherbing
patent: 5020349 (1991-06-01), Lee
patent: 5121618 (1992-06-01), Scott
patent: 5402660 (1995-04-01), Osada
patent: 5829280 (1998-11-01), Chen
patent: 6038898 (2000-03-01), Cliff
patent: 6125673 (2000-10-01), Luker
patent: 6357271 (2002-03-01), Hsu
patent: 6550299 (2003-04-01), Lin
patent: 6584819 (2003-07-01), Hung
patent: 1384222 (1975-02-01), None
patent: 532372 (1955-08-01), None
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