초록 ▼

A chain saw guide bar including a chain tightening mechanism. A shaft or rack slidable within the bar body includes a head portion slidable rearwardly against a bar mounting stud. The head portion resides between opposed edges formed in the bar body and the head portion includes fingers that straddl

A chain saw guide bar including a chain tightening mechanism. A shaft or rack slidable within the bar body includes a head portion slidable rearwardly against a bar mounting stud. The head portion resides between opposed edges formed in the bar body and the head portion includes fingers that straddle the mounting stud. Rearward sliding of the shaft or rack against the stud produces a lateral force urging spreading of the fingers to produce wedging of the fingers between the opposed edges and the stud. Such wedging of the fingers produces resistance to return sliding of the shaft and retains the tightened condition of the chain.

대표청구항 ▼

[ We claim:] [1.] A guide bar for a chain saw wherein the guide bar is mounted on a mounting stud of the saw in a manner that permits relative linear sliding for tightening of a saw chain entrained on the bar and a drive sprocket of the saw, said chain saw guide bar comprising:an elongated body defi

[ We claim:] [1.] A guide bar for a chain saw wherein the guide bar is mounted on a mounting stud of the saw in a manner that permits relative linear sliding for tightening of a saw chain entrained on the bar and a drive sprocket of the saw, said chain saw guide bar comprising:an elongated body defining an axis along its length and having a saw chain guide edge extended around a top, a bottom and a front end of the bar, said body having a rear end to be mounted to said chain saw adjacent said drive sprocket, a mounting slot extended through the bar adjacent the rear end thereof and extended axially along the bar length and adapted to receive the mounting stud of the chain saw;a cavity formed in the body and axially extended forward of the mounting slot and in communication with the mounting slot, a movable shaft entrapped in the cavity and slidable axially therein and having a rear end portion extended into the mounting slot and engaging the mounting stud of the chain saw with the bar mounted to the chain saw;one of said cavity and slot defining opposed side edges, said rear end portion configured to have rearwardly projecting fingers each having opposed inner and outer edges, said fingers configured to straddle the mounting stud and the mounting stud engaging the inner edges of the fingers to urge spreading of the fingers when the shaft is forced against the stud, and said shaft in communication with the exterior of the bar to permit manual slidable movement of the shaft to force the rear end portion of the shaft against the mounting stud whereby the bar is moved to tighten the chain and the resistance to further tightening generating spreading of the fingers which become wedged between the stud and the opposed side edges.