Fixture for a padlock

A fixture for a padlock comprising:

• a hold-down support adapted for coupling to a bicycle frame, said hold-down support including a staying bracket for coupling to the bicycle frame and a cylindrical holder for supporting a cylindrical lock body of a padlock therein, said holder having an opening formed through a wall thereof and a pair of lugs extending from said holder wall on opposing sides of said opening, each of said pair of lugs having a convex projection extending toward the other of said pair of lugs and a through hole formed therein;
• a trigger piece having a pivotal sleeve pivotally coupled between said pair of lugs and a switch head extending therefrom, said pivotal sleeve having a through bore formed therein and a pair of wave-shaped cams respectively formed on opposing sides thereof, each of said wave shaped cams having a wave trough disposed between a pair of wave crests, each of said wave crests having a fillister formed in peak portions thereof, said opening being enlarged responsive to a rotation on said trigger piece to contact said convex projections of said pair of lugs with said wave crests for receiving the cylindrical lock body in said holder, the cylindrical lock body being secured in said holder responsive to a rotation on said trigger piece to contact said convex projections of said pair of lugs with said wave troughs;
• a pivot assembly secured between said pair of lugs for pivotally coupling said trigger piece thereto, said pivot assembly including (1) a pin bush disposed adjacent one of said pair of lugs, (2) a spring disposed in said pin bush, (3) a locating pin extending through said spring, said pin bush, said through bore of said trigger piece, and said through hole of said one lug, (4) a bolt extending through said locating pin and said through hole of the other of said pair of lugs, and (5) a nut threadedly engage with said bolt.