CA2053498A1 - Chainsaw for lumber making - Google Patents

Abstract

A chainsaw consists essentialy of a motor driven chain with cutting teeth. Chainsaws are widely used for felling trees and for cutting long pieces of wood into shorter pieces. There are devices to guide a chainsaw axially along the grain, to make lumber from trees. All of these devices cut across the end grain of the wood.
It is well known that cutting across end grain is slow and energy consuming. The sawdust produced is a powder.
It is also known that a chainsaw held with the cutting edge parallel to the grain cuts a great deal faster, tearing out thin strips of wood instead of fine sawdust.
This invention is a means for presenting the cutting chain substantially parallel to the wood grain, and guiding it so as to cut flat surfaces of any length.
Tests have shown that my invention cuts lumber from three to ten times, (depending on the type of wood), faster than previously available chainsaw devices of equal power. This is achieved by a novel bar of approximately triangular shape carrying the cutting chain, and means to guide the bar to form a flat surface as long as any log. The novel bar and guide apparatus are described in the following specification.