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Padlock with alarm and shackle locking mechanism

  • US 9,115,511 B1
  • Filed: 08/06/2013
  • Issued: 08/25/2015
  • Est. Priority Date: 08/08/2012
  • Status: Active Grant
First Claim
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1. A theft resistant padlock comprising:

  • a lock body;

    an elongate locking shackle having a first end portion that is received by an interior chamber of said lock body such that said first end portion is retractable and axially pivotable within said interior chamber;

    said locking shackle having an opposite second end portion that is alignable with and selectively received by a shackle receptacle in said lock body when said shackle is retracted to close said padlock;

    said lock body accommodating an axially rotatable keyhole cylinder, which includes a keyhole for receiving a matching key and being turned by the matching key to axially rotate said keyhole cylinder within said lock body;

    a shackle retention assembly attached to said keyhole cylinder and including an opposing pair of retention members that are lockingly engageable with corresponding locking slots formed proximate respective opposite ends of said shackle;

    said shackle being retracted relative to said lock body and said second end of said shackle being received by said shackle receptacle whereby turning the matching key engaged with said keyhole in a first forward direction axially rotates said key cylinder and engages said retention members with said corresponding locking slots to hold said shackle in a closed and locked condition and turning the matching key engaged with said keyhole in an opposite reverse direction rotates said key cylinder to disengage said retention members from said corresponding locking slots and open said shackle relative to said lock body;

    an alarm circuit including an alarm, a battery power source and a switch interconnecting said battery power source and said alarm for alternately activating and deactivating said alarm, said shackle carrying a cut detection sensor for sensing when said shackle has been cut;

    a switch actuator responsive to said cut detection sensor for operating said switch to activate said alarm when said shackle is cut;

    a shackle lifting spring within said lock body for urging said shackle into a lifted condition to open said shackle relative to said lock body when a matching key engaged with said keyhole is turned in the opposite reverse direction to disengage said retention members from said corresponding locking slots; and

    a switch actuator spring interconnecting said first end portion of said shackle and said switch actuator for urging said switch actuator to slide outwardly from said shackle channel such that when said shackle is cut, said cut detection sensor releases said switch actuator and said switch actuator spring urges said switch actuator to engage said switch and activate said alarm.

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