초록 ▼

A guide bar extension member coupled to a guide bar of a chain saw for selectively lengthening or shortening the cutting bar for cutting different size pieces of timber, for example. In its preferred form, the guide bar comprises a sectional guide bar assembly which is separable at the high point of

A guide bar extension member coupled to a guide bar of a chain saw for selectively lengthening or shortening the cutting bar for cutting different size pieces of timber, for example. In its preferred form, the guide bar comprises a sectional guide bar assembly which is separable at the high point of its curved periphery into rear and forward guide bar portions with an extension element of a predetermined length inserted therebetween.

대표청구항 ▼

In a chain saw including a cutting chain adapted to travel around a guide bar and being coupled to and driven by a drive unit, the combination comprising: an elongated multiple section guide bar whose periphery is convexly curved, at least in part, and comprised of rear and forward coplanar guide ba

In a chain saw including a cutting chain adapted to travel around a guide bar and being coupled to and driven by a drive unit, the combination comprising: an elongated multiple section guide bar whose periphery is convexly curved, at least in part, and comprised of rear and forward coplanar guide bar portions each having a peripheral cutting chain track, with the rear end of said rear portion being attachable to the drive unit; and a coplanar guide bar extension member of predetermined length located intermediate said rear and forward guide bar portion for varying the working length of said guide bar, said extension member having matching height dimensions with the rear and forward guide bar portions at the points of junction therewith and having upper and lower peripheral cutting chain tracks joining the tracks of said rear and forward guide bar portion to provide a coextensively continuous cutting chain track.