Patent Application
20050097932
(1) Field of the invention
This invention relates to an anti-twist key lock with changeable locking device, especially a key lock which having revolving front plug to prevent it from twisting or knocking by vandals or thieves to unlock or break up.
(2) Description of the Prior Art
In order to protect individual's life and property, various safety locks are used widely in our daily life. The conventional safety lock almost having a hollow lock case in which an interlock tumbler set is installed therein, the key can be inserted into the front end of the hollow lock case to actuate the interlock tumbler set, further, the rear end of the hollow lock case being covered with a back plug to locate the interlocking tumbler set, and a plurality of screws being screwed through the circumference of the hollow lock case into the back plug to fix it. However, the back plug may apart from the hollow lock case by knocking violently the front end of the key lock assembly. Accordingly, an improved key lock assembly has been developed in present, the key lock assembly having a hollow lock case, the back end of the hollow lock case being closed, the front open end of the hollow lock case being covered with a front plug. The front plug is fixed on the hollow lock case by means of a plurality of screws, further, the center of the front plug having a through hole for inserting the key into the interlocking tumbler set. Such kind of safety lock can prevent vandals or thieves from knocking the plug to unlock or break up the lock, however, the vandals or thieves can insert a tool into the through hole of the front plug to twist violently to break the lock.
It is therefore the main object of this invention to provide an anti-twist key lock with changeable locking device, the anti-twist key lock having a key lock case, the back end of the key lock case being closed, the circumference of the front open end of the key lock case having a slit and an opposite inner groove. A locking tumbler set is installed in the key lock case for interlocking the lock bolt, and a front plug with receiving groove being inserted into the open end of the key lock case, then using an U-shape locating retainer to insert into the receiving groove of the front plug from the slit to locate the front plug and make it can be rotated freely to prevent the key lock from knocking or twisting to unlock or break up.
In the drawings, which illustrate the preferred embodiments and modes of operation of the invention, and in which like reference characters designate the same or similar parts throughout the several views:
Referring to
The tumbler disks (32) and the space disks (33) is deposited in sequence in the hollow carrier (31), further, to make the notches (321) (331) of the tumbler disks (32) and the space disks (33) aim to the longitudinal aperture (311), then inserting a connecting pin (312) into the gap between the notches (321) (331) and the longitudinal aperture (311) to connect each other. The assembled hollow carrier (31) can be pushed into the key lock case (1), meanwhile, to make the guiding groove (41) fit on a guiding rail (not shown in the figures) and make the interlocking post (314) extend to the concave part (42) of the locking bar (4). The fitting part (22) of the front plug (2) can be pushed into the front open end (11) of the key lock case (1), then inserting the U-shape locating retainer (14) into the receiving groove (221) of the front plug (2) through the slit (12) to locate the front plug (2) and make it can be rotate freely, the end of the locating retainer (14) being inserted into the inner groove (121) of the key lock case (1). To use a key to insert into the locking tumbler set (3) and rotate the locking post (314) to push the locking bar (4) inwardly or outwardly to unlock or lock.
Two sides of the locating retainer (14) is formed into wavy shape (142) so as to make it can be supported on the wall of the slit (12) and the inner groove (121) firmly, further, on the locating retainer (14) having two retaining grooves (141), then the operator can use a special tool to insert into the retainer grooves (141) to take out the locating retainer (14).
According, the front plug (2) can be rotated freely when we twisting it, thus the above anti-twist key lock can prevent the vandals or thieves from twisting or knocking the front plug to unlock or break up the key lock, furthermore, the tumbler disks (32) and the space disks (33) can be changed or replaced with new one freely by taking out the locating retainer (14).
It is understood by those skilled in the art that the forgoing description is a preferred device and that various changes and modifications may be made in the invention without departing from the spirit and scope thereof.
