Patent ID: 8267818

Claim:
A sprocket for interfacing with a perforated material, comprising: (a) a hub shaped to fit around an axially extending shaft, the hub comprising: (i) a plurality of hub portions each shaped to fit around a portion of the shaft; and (ii) a retaining portion and a hub interlocking portion, each disposed on at least one of the hub portions; and (b) a material-interfacing plate having a periphery shaped to interface with the perforated material, the material-interfacing plate comprising: (i) a plurality of plate portions each shaped to fit around a portion of the hub; and (ii) a plate interlocking portion shaped to interlock with the hub interlocking portion and disposed on at least one of the plate portions, the material-interfacing plate being in a secured position when the plate interlocking portion and the hub interlocking portion are interlocked with each other, the interlocked plate interlocking portion and hub interlocking portion preventing the material-interfacing plate from sliding radially off the hub and the retaining portion preventing the material-interfacing plate from sliding axially off the hub when the material-interfacing plate is in the secured position, wherein the at least one of the plate portions is sufficiently elastic that the at least one of the plate portions can flex from an initial position to a deformed position to allow the plate interlocking portion to fit around the hub interlocking portion, and wherein the material-interfacing plate transitions to the secured position when the at least one of the plate portions relaxes from the deformed position when around the hub interlocking portion such that the plate interlocking portion interlocks with the hub interlocking portion.