Patent ID: 7530246

Claim:
A wafer-type tumbler cylinder comprising a sleeve, a cylinder, a plurality of wafers, and a plurality of springs, further including: a shaft of said cylinder having a first and a second semicircular columnar body; said first semicircular columnar body having: a flange disposed at the front end thereof, a drive section disposed at the rear end thereof, one or more rightward U-shaped slots on the inner lateral surface thereof, one or more pairs of posts disposed at the front and rear ends of the inner lateral surface thereof, and a half-keyway disposed in the center of the inner lateral surface thereof; said second semicircular columnar body having: one or more leftward U-shaped slots on the inner lateral surface thereof, which correspond to said rightward U-shaped slots of said first semicircular columnar body, one or more pairs of holes disposed at the front and rear ends of the inner lateral surface thereof, which correspond to said posts of said first semicircular columnar body, and a half-keyway formed in the center of the inner lateral surface thereof and in the corresponding position to said half-keyway of said first semicircular columnar body; each of said wafers and said springs being pivotally fixed in each of said rightward U-shaped slots, then said second semicircular columnar body being inserted into a transversely U-shaped indentation between said flange and said drive section of said first semicircular columnar body, so that each of said posts of said first semicircular columnar body respectively inserted into said holes of said second semicircular columnar body for the assembly of said shaft of said cylinder; wherein a relatively wider rectangular notch is disposed between every two rightward U-shaped slots or every two leftward U-shaped slots, which are respectively installed with a wafer, and as such, only one spring is positioned in said relatively wider rectangular notch, thereby serving as a shared spring for every two wafers.