E - Fixed Constructions – 05 – B
Patent
E - Fixed Constructions
05
B
292/19
E05B 63/14 (2006.01) E05B 59/00 (2006.01)
Patent
CA 1051058
ABSTRACT OF THE DISCLOSURE The present invention relates to the field of door latch and lock mechanisms. Known latch bolt mechanisms and dead bolt mechanisms are individual and separate mechanisms, with the latch bolt mechanisms frequently including its own lock. Accordingly, two keys (or alternatively, one key fitting both locks) are required to unlock both the latch mechanism and to withdraw the dead bolt. The present invention provides an improved lock cylinder with dual driver, whereby an independent drive for the dead bolt mechanism and the door latch mechanism may be achieved with a single lock so as to provide withdrawal of both the latch bolt and the dead bolt by rotation of the key inserted into the lock cylinder. A conventional lost motion drive extends from the rear of the cylinder assembly. In addition, a cam is coupled to the cylinder assembly threaded cap so as to provide a direct drive thereto, with a cam being coupled to the latch mechanism so that both the dead bolt and the latch bolt are retracted upon rotation of a key in the lock. Separate drives for the dead bolt and latch bolt allows retraction of the dead bolt faster than the latch bolt, tending to avoid binding of the latch bolt sometimes encountered with other mechanisms. In a preferred embodiment, the cam is captured and retained with respect to the cylinder assembly. In a second embodiment, the cam is a slip-fit to the cylinder assembly and retained by additional structure.
268783
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