Exposed shackle padlock

An exposed shackle padlock comprising a casing having shackle openings in a top wall thereof for reception of shackle legs, a shackle movable relative to the casing between inner locking and outer release positions having legs extending through said openings including a longer leg supported for axial and rotary movement within the casing and a shorter leg having a latching notch, means defining a stationary pivot in a lower region in the casing, a fence plate having a fence flange and a locking flange integrally formed thereon supported for rocking movement between latching and unlatching positions about a first pivot axis adjacent the pivot and having a slot shaped to accommodate lateral translatory relative movement of the pivot in the slot, said locking flange projecting into locking relation in said latching notch at the inner locking position of the shackle when the fence plate is in latching position, rotatable locking means in said casing including a peripherally gated rotatable tumbler wheel member normally occupying a locking position wherein peripheral portions thereof adjacent said fence flange prevent fence plate movement from said latching position and operable from externally of the casing to occupy an unlocking position disposing its gate to receive the fence flange and accommodate rocking of the fence plate to unlatching position, means operable when the locking means is in said unlocking position for moving the fence plate to unlatching position responsive to initial inward force on the shackle causing inward shackle travel followed by outward withdrawing force on the shackle causing outward shackle travel including an actuator plate coupled to and movable with said longer shackle leg located within the casing in adjacent parallelism with the fence plate having a lug projecting therefrom, the fence plate having a shouldered slot therein receiving said lug shaped to dispose the shoulder portion of the slot in adjacent overlying relation to the lug when the fence plate occupies the latching position to intercept the lug and prevent movement toward release position of the actuator plate and interconnected shackle, the shouldered slot having a passage shaped and located when the fence plate is in unlatching position to accommodate travel of the lug during shackle releasing movement of the actuator plate responsive to said outward withdrawing force on the shackle, means for initially rocking said fence plate about said pivot from latching to unlatching position responsive to application of said initial inward force on the shackle when the locking means is in said unlocking position to withdraw the locking flange from the latching notch and shift said shouldered portion of the shouldered slot out of intercepting relation to said lug, said fence plate remaining in unlatching position during an initial portion of said outward shackle travel until the latching notch is disposed outwardly beyond the locking flange and said actuator plate having a cam surface formation for engaging the fence plate and returning it to said latching position during a second portion of outward shackle travel following said initial portion, the end of said shorter shackle leg and said locking flange being shaped for rocking the fence plate toward unlatching position to admit the shackle to said inner locking position during inward travel of the shackle, and spring means for returning the locking flange into locking relation in said latching notch when the shackle reaches said inner locking position following said inward travel.