Tree felling device

Claim 1

A tree felling device adapted to be operated when suspended from a crane beam and comprising: at least one arcuate frame member pivotally mounted about a single pivot shaft; an endless saw chain journalled about a plurality of sprockets in a plane in each said at least one frame member; means associated with one of said sprockets for rotating said one sprocket and for thereby rotating said saw chain in an operative direction; said saw chain having a straight length thereof between two of said sprockets forming an operative part for cutting; a saw blade mounted within said frame member; said saw blade having a straight guiding edge portion extending between ends of said frame member and having therein a straight groove, said operative part of said saw chain Being slidingly guided within said groove, at least said guiding edge portion of said saw blade having a thickness at least as great as the largest cross sectional shape of said saw chain, said guide edge portion of said blade thus forming means for supporting a tree during cutting and preventing said tree section from clamping downwardly on said operative part of said saw chain; said pivot shaft being located outside said saw chain and having an axis inclined at an angle of from 0*-60* to the principal direction of movement of said operative part of said saw chain; and the cross sectional shape of said saw blade, formed by any plane perpendicular to said pivot shaft, being an arc with a radius substantially corresponding to the perpendicular distance from said pivot shaft.