Door latch operating assembly

A door latch operating assembly capable of rotating a door latch arm between a first locked position for locking a door in a closed position and a second unlocked position for unlocking said door, said latch operating assembly comprising:

• a lock platform having a face plate and an outer peripheral edge margin extending generally perpendicularly away from the face plate towards the door, the face plate extending along a vertical plane generally parallel with respect to the vertical plane of the door and having an opening formed therein;
• a handle having a gripper portion adapted to be grasped by a person's hand for rotating the handle, and a shaft portion attached to the gripper portion and extending therefrom through said opening of the lock platform;
• a driver cam having a housing with a bore formed therein shaped for receiving the shaft portion of the handle therethrough so that the driver cam rotates when rotating the handle, and at least one wing member extending laterally outwardly from one side of the housing, said wing member having an upwardly facing engaging surface;
• a link linearly movable with respect to said lock platform, said link having a bottom edge portion with a downwardly facing engaging surface which bears against the upwardly facing engaging surface of the wing member of the driver cam, and a top edge portion with an upwardly facing engaging surface, said wing member of said driver cam being adapted to move the link when rotating said driver cam;
• a disk rotatably mounted on the face plate of the lock platform about an axis of rotation, said disk having a detent radially spaced from said axis of rotation and engageable with the upwardly facing engaging surface of the top edge portion of the link, said link being adapted to rotate said disk upon movement of the link, the amount of rotation of the disk being controlled by the location of the detent thereon wherein the further the detent is spaced from said axis of rotation the less the disk rotates when the link is moved and closer the detent is spaced towards said axis of rotation the more the disk rotates when the link is moved;
• and
• a shaft mounted on said disk and rotatable about said axis of rotation, said shaft carrying said latch arm thereon whereby said latch arm is moved between its first and second positions.