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Electronic Combination Lock

  • US 20080060393A1
  • Filed: 08/29/2007
  • Published: 03/13/2008
  • Est. Priority Date: 09/07/2006
  • Status: Active Grant
First Claim
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1. An electronic combination lock for keyed and keyless access, comprising:

  • a door handle having a turn button and a code entry button formed thereon, the code entry button for receiving an input code in the form of momentary taps of the code entry button, the door handle housing a lock assembly and an electrical circuit;

    the lock assembly comprising;

    a lock body including an axial opening for housing a cylinder movable within the lock body and one or more vertical bores for housing one or more spring loaded lift lock pins;

    the cylinder comprising a key slot for engaging a key to operate the lock, and one or more bores for accommodating one or more key pins with variable length matching the key, the one or more bores being aligned with the one or more vertical bores of the lock body to allow the key pins to be positioned under the spring loaded lift lock pins, the spring loaded lift lock pins being positioned at least partially in the bores of the cylinder in the locked position, the cylinder further comprising a latch reset cam path for engaging a latch rest pin and a code programming cam path for engaging a program switch, wherein the cylinder is rotated within the axial opening by the key or the turn button when the spring loaded lift lock pins are lifted out of the cylinder;

    a lift comb comprising fingers for engaging the lift lock pins and a notch, the lift comb being mounted on a first rod and spring loaded to pivot about the first rod to lift the lift lock pins out of the cylinder in the unlock position;

    a latch comprising a finger for engaging the notch of the lift comb, the latch being mounted on a second rod and spring loaded to pivot about the second rod to engage the lift comb, wherein the latch reset pin, when engaged by the latch reset cam path, pushes the lift comb against the spring-loaded force to cause the lift comb to be engaged with the latch; and

    a magnet being selectively activated to engage the latch, the magnet pulling the latch against the spring-loaded force to cause the latch to release the lift comb,wherein the electrical circuit receives a first input signal from a number switch being actuated by the code entry button and a second input signal from the program switch, the electrical circuit being operative to store an entry code when the program switch is actuated and to activate the magnet when an input code matching the stored entry code is received.

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