초록 ▼

A chain tensioner for a chain saw has a cam member in positive engagement with a flange of a plate attached to the guide bar. Rotation of the cam member forces the guide bar away from a drive sprocket of the chain saw to tension the chain. The cam member is clamped in position to maintain the guide

A chain tensioner for a chain saw has a cam member in positive engagement with a flange of a plate attached to the guide bar. Rotation of the cam member forces the guide bar away from a drive sprocket of the chain saw to tension the chain. The cam member is clamped in position to maintain the guide bar in the adjusted position. Flats on the cam member in abutment with the flange resist rotation of the cam member when in the adjusted and clamped position. A slot is provided in the cam member to facilitate rotating the cam to force the guide bar away from the drive sprocket.

대표청구항 ▼

[ We claim:] [1.] A chain saw comprising:a chain saw housing, a drive sprocket mounted to the housing and at least one mounting stud affixed to the housing;a guide bar having a peripheral saw chain guide edge mounted to the mounting stud and thereby positioned relative to the drive sprocket for coop

[ We claim:] [1.] A chain saw comprising:a chain saw housing, a drive sprocket mounted to the housing and at least one mounting stud affixed to the housing;a guide bar having a peripheral saw chain guide edge mounted to the mounting stud and thereby positioned relative to the drive sprocket for cooperative mounting and guiding of a saw chain loop along a specified guide path extended from the sprocket and along the guide edge of the guide bar, the guide bar as mounted to the mounting stud permitting a limited range of linear sliding movement of the guide bar toward and away from the sprocket;an endless saw chain loop having a length that fits the specified guide path within the range of sliding movement of the guide bar;a clamping member clamping the bar in a fixed position within said range of movement, and said bar provided with a fixed bearing surface positioned adjacent to and spaced from the mounting stud in the direction of sliding movement, and a cam member having a stud receiving opening receiving said mounting stud and a peripheral outer edge portion of the cam member increasing in distance from the opening, said peripheral outer edge portion adapted to engage the bearing surface, and said cam member rotatable on said mounting stud to vary the point of contact as between the peripheral outer edge portion and the bearing surface to produce sliding movement of the bar within said range of movement and thereby a desired tension of the saw chain loop.