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US 4,395,893 AGranted
Plate tumbler-type cylinder lock mechanism
AssigneeChicago Lock Co.
InventorRobert L. Steinbach
Life of this patent
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AssigneeChicago Lock Co.
InventorRobert L. Steinbach
Estimating the term…
An improvement in a plate tumbler-type cylinder lock mechanism including an elongate barrel having a longitudinal bore therein, and a key plug having a body portion and a shaft portion extending therefrom, such plug being received rotatably in the bore with the body portion extending between opposite ends of the barrel and the shaft portion extending outwardly from one end of the barrel, the bore having a draft-induced longitudinal taper widening in the direction of the said one end of the barrel, such improvement including journal means on the body portion and projecting laterally therefrom for journalling the plug in the barrel adjacent to the said one end thereof, thereby to minimize lateral play between the plug and the barrel thereat. Preferred structure for limiting the rotation of the plug embodies stop means for interengaging the journal means and the barrel.
In a plate tumbler-type cylinder lock mechanism including an elongate barrel having a longitudinal bore therein, and a key plug having a body portion and a shaft portion extending therefrom, said plug being received rotatably in said bore with said body portion extending between opposite ends of the barrel and said shaft portion extending outwardly from one end of the barrel, said bore having a draft-induced longitudinal taper widening in the direction of said one end of the barrel, the improvement which comprises journal means on said body portion and projecting laterally therefrom for journalling said plug in said barrel adjacent to said one end thereof, thereby to minimize lateral play between the plug and the barrel thereat.
In a plate tumbler-type cylinder lock mechanism including an elongate barrel having a longitudinal bore therein, and a key plug having a body portion and a shaft portion extending therefrom, said plug being received rotatably in said bore with said body portion extending between opposite ends of the barrel and said shaft portion extending outwardly from one end of the barrel, said bore having a draft-induced longitudinal taper widening in the direction of said one end of the barrel and said body portion being substantially cylindrically shaped, the improvement which comprises ring-shaped flange means on said body portion and projecting laterally therefrom for journalling said plug in said barrel adjacent to said one end thereof, said flange means defining a recess between portions thereof, and stop means comprising lug means on said barrel internally thereof and adapted to extend into said recess for interengaging said flange means and said barrel, thereby to limit rotation of said plug.
Dependencies are inferred from the claim text.