| 摘要 |
<p>A door latch (1) couples energy between a closed door (3) and its jamb (10), eg for remote control of an on-door lock. The latch includes an energy coupler (20) which is mechanically coupled to the latch bolt. As the bolt advances and retracts across the door-jamb gap, the energy coupler moves similarly. The coupler may couple electromagnetically by a transformer or electrically by contacts (20). A corresponding coupler (31) in an auto-aligning latch strike (12), for co-operating with the latch, is attached to a frame by which the strike is fixed to a door jamb. Movement of the coupler relative to the strike frame is restrained in two of three orthogonal directions, while allowed in the third so that the strike and latch couplers can align. Electrical connection via an elongated and cantilevered electrical contact (25L) in the latch is broken by retraction of the latch bolt, to resist tampering attempts.</p> |
