Locks – Operating mechanism – Key
Reexamination Certificate
2003-07-01
2004-12-07
Barrett, Suzanne Dino (Department: 3676)
Locks
Operating mechanism
Key
C070S107000, C070S208000, C070S417000, C070S451000
Reexamination Certificate
active
06826937
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a lock, which is comprised of inner and outer locking elements respectively fitted to inner and outer sides of a door so that people inside the room also have to use the key to unlock the door after the door is locked, more particularly one, which is secured to the door in such a manner that none of the screws show that are used to fasten the lock to the door, preventing thieves from easily damaging, dismantling or removing the lock to open the door.
2. Brief Description of the Prior Art
Conventional door locks are comprised of a locking element on an outer side of the door, and a knob on an inner side of the door so that after the door is locked, people outside the house cannot open the door without the key while people inside the house can open the door without the key. Such locks are not ideal because thieves can open the door to easily steal after they have entered the house from windows stealthily. Therefore, bi-directional locks are provided to overcome the above disadvantages, which locks are made such that people inside the room also have to use the key to open the door after the door is locked.
Referring to
FIG. 6
, a conventional bi-directional lock is provided, which is comprised of inner and outer locking elements
10
,
20
secured to inner and outer sides of a door
30
so that people inside the house also has have to use the key to unlock the door
30
after the door
30
is locked with the lock; screws
40
are screwed through the inner locking element
10
, and the door
30
, and then screwed into the outer locking element
20
. Thus, a person in the house without the key can't operate the inner locking elements
10
to unlock the door in case the door has been locked by means of operating the outer locking element
20
with the key.
The above lock is easy to damage or dismantle because the screws
40
show on the inner side of the door, and can be easily screwed off the lock. Therefore, thieves can easily unlock, and open the door
30
after they have entered the room stealthily. Consequently, thieves can leave the house through the door, making it difficult for other people to suspect that thieves are stealing, and can easily steal large properties from the house by moving them via the door.
SUMMARY OF THE INVENTION
It is a main object of the present invention to provide a bi-directional lock to a house so that people inside the house also have to use the key to unlock the door after the door is locked, and which lock is secured to the door in such a manner that none of the fixing elements show that are used to fasten the lock to the door, preventing thieves from easily removing the lock from the door to open the door.
The lock is comprised of inner and outer locking elements respectively disposed on inner and outer sides of a door; the outer locking element has several hollow posts, which project into the door and don't communicate with outside, and into which screws are screwed from the inner side of the door; the inner locking element has several fixing posts, which project into the door, and into which screws are screwed from the free end of the door where the dead bolt is disposed.
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patent: 4073172 (1978-02-01), Schlage
patent: 4296619 (1981-10-01), Widen
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patent: 4576023 (1986-03-01), Crepinsek
patent: 4813250 (1989-03-01), Yeh
patent: 4887856 (1989-12-01), Percoco et al.
patent: 5267461 (1993-12-01), Eizen
patent: 5419167 (1995-05-01), Yamada et al.
patent: 5586796 (1996-12-01), Fraser
patent: 5761936 (1998-06-01), Katayama
patent: 5787741 (1998-08-01), Shen
patent: 5881585 (1999-03-01), Kang
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patent: 6698260 (2004-03-01), Su
patent: 6701758 (2004-03-01), Hoffmann
patent: 2002/0134123 (2002-09-01), Huang
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Barrett Suzanne Dino
Rosenberg , Klein & Lee
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