Patent ID: 7360381

Claim:
A locking device, comprising: a door to be secured; a rotatable knob adapted for mounting at a front surface of the door and having locked and unlocked positions; a locking member adapted for positioning at an opposite rear surface of the door and in alignment with said rotatable knob; said locking member further including a latch plate integral therewith; means for securing the rotatable knob to the locking member through the door; and a key-controlled lock supported at the front surface of the door and having locked and unlocked positions; said latch plate being supported for rotation between locked and unlocked positions and controlled from said rotatable knob; said key-controlled lock being spacedly disposed from said locking member and adapted for engaging, inside the door, with said latch plate; said key-controlled lock, in its locked position, engaging with said latch plate to prevent rotation of said rotatable knob, and in its unlocked position, disengaging from said latch plate to enable rotation of said rotatable knob from its locked position to its unlocked position; wherein the locking member includes a locking bar and a transverse leg that interconnects the locking bar and the latch plate; wherein said latch plate extends from said leg and has a free end that is in alignment with said key-controlled lock; wherein the latch plate free end has a hole that receives a plunger of the key-controlled lock when the key-controlled lock is in its locked position; wherein the key-controlled lock includes a housing having the plunger extending therefrom in the locked position and having the plunger withdrawn from the latch plate hole in the unlocked position so as to enable the latch plate to be rotated; and wherein said locking bar, transverse leg and latch plate are all integrally formed and all rotate in substantially the same plane and substantially in parallel to the plane of the door.