Reinforced cylindrical door lock set

摘要

A cylindrical door lock set includes inner and outer knob supporting plates, a turning mechanism, an annular mounting plate and a latch unit. The outer knob supporting plate has a central hole and an inner side provided with a pair of posts on two sides of the central hole. The posts are hollow and are threaded internally. The turning mechanism is supported on the inner side of the outer knob supporting plate and is provided with a turn shaft. The annular mounting plate is secured on the inner side of the outer knob supporting plate and is formed with a pair of mounting shafts and a central hole to permit the turn shaft of the turning mechanism to extend therethrough. The latch unit is formed with a shaft engaging hole to permit the turn shaft to extend therethrough, and two side holes disposed on two sides of the shaft engaging hole in a lengthwise direction of the latch unit to receive respectively the mounting shafts. The latch unit is disposed between the posts of the outer knob supporting plate. The inner knob supporting plate is formed with a pair of holes which are aligned with the posts. Bolts pass through the holes of the inner knob supporting plate and engage a respective one of the posts.