E - Fixed Constructions – 05 – C
Patent
E - Fixed Constructions
05
C
292/42
E05C 1/16 (2006.01)
Patent
CA 1257311
Abstract of the Disclosure An improved mortise lock is provided with spring means for independently returning each of the inside and outside lever handles from a rotated operating position. The mortise lock includes a latch bolt that is slidably mounted in a lock case and biased to a projected position through the edge face of such case. Inside and outside operating hubs are independently rotatably mounted coaxially in the case and operable respectively by the inside and outside lever handles or knobs. A retraction lever extends from a pivot in the case past the hubs and into retracting engagement with the tailpiece of the latch bolt. Each operating hub is formed to include at least one hub camming surface. Each hub further includes a cam flange. The cam flanges of the two hubs lie adjacent and parallel to each other. The cam flanges are operable, on rotation of one of the operating hubs, to engage the retraction lever to pivot the retraction lever rearward so as to slidably retract the latch bolt. In one embodiment, a complementary pair of inside and outside hub bias arms are pivotally mounted in the case in side-by-side relation to provide a suitable "lever/lever" grip combination. Each bias arm is loaded with a torsional hub spring to cause said bias arm normally to operate on its companion hub whereby such operation returns the companion hub from a rotated lock-operating position. In another embodiment suitable for providing a "lever/knob" grip combination, a single hub bias arm having a bias arm camming surface is pivotably mounted in the case to operate on the hub camming surface of either the inside or the outside hub. A cylindrical hub sleeve is installed to replace the removed second hub bias arm that was included in the "lever/lever" combination. The remaining single bias arm is loaded with a torsional spring to cause said bias arm to operate on only one of the two hubs. Thus, the other of the two hubs is operable by rotation of a conventional knob.
488973
Carey Kevin L.
Foshee William R.
Best Lock Corporation
Gowling Lafleur Henderson Llp
LandOfFree
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