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Lockset having electric means for disabling and enabling the outer handle

  • US 5,018,375 A
  • Filed: 09/18/1990
  • Issued: 05/28/1991
  • Est. Priority Date: 09/18/1990
  • Status: Expired due to Fees
First Claim
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1. A door lock comprising an inner handle, an outer handle, a latch housing between the handles and containing a latch retractor, first spring means biasing the latch retractor outwardly, coaxial inner and outer tubular spindles receiving the respective handles and both terminating respectively inside the lock in arcuate pull-back scoops, the two scoops being aligned end-to-end and disposed against the side of the retractor opposite the first spring means and each being adapted when turned to activate the latch retractor, the inner handle being keyed to the inner spindle, the outer spindle being notched out at its outer end, the notch comprising a longitudinal slot and an adjoining partial circumferential space, the outer spindle having thereinside a transversely disposed disc having a central opening and a radial dog, the outer handle having a shank with a longitudinal interior spline, the disc and dog normally disposed with the dog extending through the longitudinal slot and into the spline to key the outer handle and the outer tubular spindle into unitary rotation with each other, and an electrical motor fixedly mounted in the inner tubular spindle, the motor having a central rotary shaft coaxial with the spindles and extending through the retractor and into the central opening in the disc, the shaft having an outward radial pin intermediate the retractor and the disc, an axial spring closely surrounding the shaft and having one end fixed in the disc and the other end embracing the shaft on the far side of the pin from the disc, the pin being disposed between adjacent turns of the spring, whereby, depending on rotary direction, rotation of the motor will drive the disc and dog either into the longitudinal slot to key the outer spindle and shank together or outward into the circumferential space so that the outer handle is disconnected from the outer spindle.

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