Locks – Operating mechanism – Key
Reexamination Certificate
2001-11-01
2003-07-22
Barrett, Suzanne Dino (Department: 3627)
Locks
Operating mechanism
Key
C070S387000, C070S134000
Reexamination Certificate
active
06595032
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to locks, and more particularly, to a lock cylinder-free lock device, which achieves high security subject to “accurate depth”.
A regular lock device is known comprising a lock body, a latch bolt, a lock cylinder rotated with the key to move the latch bolt in and out of the lock body between the locking position and the unlocking position. This structure of lock device has drawbacks. A thief can easily unlock the lock device by inserting a wire rod into the keyway of the lock cylinder to move the moving elements in the lock cylinder into the accurate unlocking position. Further, because the structure of the lock cylinder is complicated, it needs special techniques to assemble the lock cylinder and to install the lock cylinder in the lock body.
SUMMARY OF THE INVENTION
The present invention has been accomplished to provide a lock device, which eliminates the aforesaid drawbacks. It is one object of the present invention to provide a lock cylinder-free lock device, which eliminates the use of a complicated lock cylinder. It is another object of the present invention to provide a lock cylinder-free lock device, which achieves high security. It is still another object of the present invention to provide a lock cylinder-free lock device, which is inexpensive to manufacture and, easy to install. According to one aspect of the present invention, the lock cylinder-free lock device comprises a casing, a locating block fixedly covered on a top side of the casing, the locating block having a plurality of vertical pinholes, a locking block moved in the casing between the locking position and the unlocking position, the locking block having spring-supported pins respectively extended out of a stepped top sidewall thereof and adapted for engaging into the pinholes of the locating block when the locking block moved to the locking position, and a key adapted for unlocking the locking block, the key having bottom pins of different lengths adapted for inserting into the pinholes of the locating block to disengage the spring-supported pins the locating block. According to another aspect of the present invention, the pinholes of the locating block each have an expanded bottom section of diameter smaller than the top end of each of the stepped through holes of the locking block. This design prevents the thief from detecting the accurate insertion depth of inserting a rod member in each pinhole of the locating block to disengage the corresponding spring-supported headed pin from the locating block without engaging into the corresponding stepped through hole in the locking block.
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