Patent ID: 6944958

Claim:
A chain saw comprising a housing, a chain comprised of links which include chain link mating elements and cutters, and an elongated support extending in a longitudinal direction outward from inside said housing, in the outer surface of said elongated support there being present a continuous chain channel guide into which said chain link mating elements are slideably inserted, such that during normal operation said chain link mating elements slide essentially freely through said continuous chain channel guide when forced to do so, said elongated support being slit in said longitudinal direction, such that upper and lower portions above and below the longitudinal slit can be separated from one another at least at one location along the longitudinal extent thereof, said longitudinal slit enabling separation of the upper and lower portions of said elongated support, and thereby causing tensioning of said chain; said chain saw further comprising control means for applying force between said upper and lower portions of the elongated support to move said upper and lower portions with respect to one another; and said longtitudinal slit further comprising, an effective projection on one of said upper and lower portions of the elongated support and an effective groove present in the other, said effective projection and effective groove being functionally oriented with respect to one another such that said effective projection inserts into said effective groove at locations along said longitudinal slit whereat said upper and lower portions of the elongated support contact one another, said effective projection being of a first color proximally and of a second color peripherally.