Door handle mounting assembly

A door handle mounting assembly capable of being mounted on a door, said mounting assembly comprising:

• a lock platform having a generally planar face plate and an outer peripheral edge margin extending generally perpendicularly away from the face plate towards the door when mounting the lock platform on 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 turning the handle, and a shaft portion attached at one of its ends to the gripper portion, said shaft portion extending along a longitudinal axis and through the opening of the lock platform and having a circumferential groove formed therein;
• a retaining collar having an annular wall positioned to engage the face plate of the lock platform and an inwardly projecting annular ring connected to the annular wall;
• a driver cam having an annular housing with a hollow boss extending through the opening of the lock platform along said longitudinal axis, said hollow boss having a circumferential groove formed therein which receives the inwardly projecting annular ring of the retaining collar for axially retaining the driver cam with respect to the lock platform, said annular housing and hollow boss having an inner surface defining an opening shaped for receiving the shaft portion of the handle therethrough so that the driver cam rotates when rotating the handle, said housing having an aperture formed therein in communication with the opening defined by the inner surface of the annular housing and hollow boss;
• a catch disposed within the aperture of the annular housing, said catch being received within the groove of the shaft portion of the handle for axially retaining the driver cam with respect to the handle.