Padlock

1. A padlock comprising:

a movably housed shackle stop;

a shackle that is movably mounted and comprising two arms and a shackle stop receiver for receiving the shackle stop to immobilize the shackle;

a shackle stop actuator pivotable around a laterally extending pivot axis and comprising a lateral cam surface configured to outwardly move the shackle stop into receipt by the shackle stop receiver;

a body configured to simultaneously receive a plurality of cylinder locks for actuation of the shackle stop actuator by any one of the plurality of cylinder locks and define a plurality of cylinder lock cavities for receiving the plurality of cylinder locks; and

wherein a longitudinal axis extending through an axis of rotation of each of the plurality of cylinder locks is offset from the laterally extending pivot axis of the shackle stop actuator and wherein each longitudinally extending rotational axis and the laterally extending pivot axis are nonparallel and do not intersect.

2. A padlock defined by claim 1 comprising the plurality of cylinder locks and comprising a plurality of cylinder lock cams, wherein:

the shackle stop is movably disposed in a conduit having a first conduit opening and a second conduit opening, the shackle stop receiver is positionable at the first conduit opening and when so positioned the shackle stop is movable along the conduit into receipt by the shackle stop receiver for immobilizing the shackle, wherein the lateral cam surface is configured to move the shackle stop to the first conduit opening, and each of the plurality of cylinder lock cams are cooperatively arranged with their respective cylinder lock to be in contact with the shackle stop actuator at the same time as the respective cylinder lock has captured a key and the shackle stop actuator is at the second conduit opening.

3. A padlock defined by claim 1 comprising a plurality of cylinder lock cams receivable by the body and each of the plurality of cylinder lock cams when so received are operable by the plurality of cylinder locks, when so received by the body, to pivot the shackle stop actuator, wherein each of the plurality of cylinder lock cams comprise a finger for contact with the shackle stop actuator.

4. A padlock defined by claim 3 wherein the finger is perimetrically located.

5. A padlock defined by claim 4 comprising the movably housed shackle stop, wherein one arm comprises the shackle stop receiver and the other arm comprises another shackle stop receiver for receiving the other shackle stop and immobilizing the shackle.

6. A padlock defined by claim 5 wherein the two arms are perpendicular to a laterally extending pivot axis.

7. A padlock defined by claim 6 wherein a longitudinal axis of each of the plurality of cylinder lock cavities are substantially perpendicular to the laterally extending pivot axis.

8. A padlock defined by claim 7 wherein the plurality of cylinder locks are removably fixed within the plurality of cylinder lock cavities.

9. A padlock defined by claim 8 wherein the shackle stop comprises a ball.

10. A padlock defined by claim 4 wherein:

the shackle stop is movably disposed in a conduit having a first conduit opening and a second conduit opening;

the shackle stop receiver is positionable at the first conduit opening and when so positioned the shackle stop is movable along the conduit into receipt by the shackle stop receiver for immobilizing the shackle;

wherein the lateral cam surface is configured to move the shackle stop to the first conduit opening.

11. A padlock defined by claim 10 comprising the plurality of cylinder lock cams receivable

by the body and each of the plurality of cylinder lock cams when so received are operable by the plurality of cylinder locks, when so received by the body, to pivot the shackle stop actuator.

12. A padlock defined by claim 11 wherein each of the plurality of cylinder lock cams comprise a camming surface followed by the shackle stop actuator.

13. A padlock defined by claim 12 comprising the plurality of cylinder locks to which the

plurality of cylinder lock cams are actuatably coupled thereto, wherein the shackle stop actuator is cooperatively arranged with each of the plurality of cylinder lock cams for pivoting the shackle stop actuator.

14. A padlock defined by claim 13 wherein the shackle stop actuator is pivotable between a

first position and a second position wherein the distance between the lateral cam surface and the second conduit opening when the stop actuator is at the second position is greater than that when the stop actuator is at the first position.

15. A padlock defined by claim 14 comprising a biasing element cooperatively coupled to

the shackle stop actuator, and which biases the shackle stop actuator to the first position.

16. A padlock defined by claim 15 wherein the shackle stop actuator is pivotable to a third

position wherein the distance between the lateral cam surface and the second conduit opening when the shackle stop actuator is at the third position is greater than that when the shackle stop actuator is at the first position.

17. A padlock defined by claim 16 wherein the shackle stop actuator is pivotable to the

second position by operation by one of the plurality of cylinder lock cavities.

18. A padlock defined by claim 17 wherein the plurality of cylinder lock cams comprise a

plurality of follower engages and the shackle stop actuator comprises a plurality of cylinder lock cam following surfaces.

19. A padlock defined by claim 18 wherein the plurality of cylinder lock cam following

surfaces are rounded, elongated and on opposite sides of the shackle stop actuator.