Replaceable cylinder padlock

Claim 2

In a padlock comprising a body having a pair of parallel recesses therein and having a pair of parallel bores therein, one of said recesses and one of said bores communicating by means of a countersunk hole, a shackle having a toe end with notch receivable in said one recess and having a heel end with notch receivable in the other recess, a lock cylinder unit receivable in said one bore and a lock cylinder retaining means receivable in the other bore, a rotatable cam in said one bore and movable by lock cylinder means, a pin extending through a wall of said body and engaging a spring member fitted into a cavity in said rotatable cam, said pin acting to retain said rotatable cam and said spring within said one bore, a pair of ball members each interposed between said cam and a shackle end and respectively movable into or out of shackle and notches in accordance with the position of said cam.

Claim 3

In a padlock construction as claimed in claim 1 in which the pin means of retaining said cam in said one bore also limits the degree of rotation of said cam within said one bore by interference between said retaining means and projections on one end of said cam.

Claim 4

In a padlock construction as claimed in claim 1, a U-shaped shackle member having heel and toe ends slideably mounted for movement in respective recesses in a padlock body between a locked position wherein the ends are enclosed within the said body and an unlocked position wherein the toe end is separated from the said body, the sides of the heel and toe being formed with respective first and second notches, said heel end having a flat extending from its respective notch to the physical end of said shackle member, said heel end being concentrically drilled and tapped, a shoulder bolt member screwed into tapped hole in the end of said heel end and shackle member, said shoulder bolt having a head diameter equal to the diameter of said shackle member and a shoulder radius equal to the minimum radius left by the flat on end of said heel, said shoulder bolt member when screwed to heel end forming an extension to said heel end, said shoulder bolt member having a wrench engaging means in its head.