Cap retained push button assembly

A lock assembly for a vehicle ignition switch, comprising:

• a stationary elongated hollow sleeve member having a bore therein defining an axis of rotation;
• a cylinder having an inner end disposed in said bore and an opposite outer end, said cylinder rotatable about said axis between at least lock, off and run positions, and including a key-receiving aperture formed therein opening to said outer end;
• a cap member mounted on the outer end of said cylinder for rotation therewith, said cap member including a key-receiving slot formed therein in axial alignment with said aperture forming a keyway therewith;
• a push button mounted on said sleeve member and slidably movable in an axial direction between a blocking position and a non-blocking position;
• spring means on said sleeve member for biasing said push button into said blocking position;
• stop means on said cap member projecting radially therefrom, said stop means abuts against said push button when said cylinder is in said off position to permit movement to said run position but to prevent movement to said lock position so that said push button must be moved to its nonblocking position to permit movement to said lock position from said off position;
• and
• retaining means on said cap member for retaining said push button when said cylinder is in said lock, off and run positions.