| 摘要 |
<p>There is disclosed a reciprocating chain saw made up of a length of chain formed by a plurality of serially pivotally connected cutters, a number of which cut when the chain is moved in one direction, and a number of which cut when the chain is moved in the other direction. In one use of the chain saw, it is adapted to be connected at its opposite ends to the two branches of a rope or the like, one end of which may be thrown up and around the limb of the tree which is to be cut. The cutting means disclosed are generally similar to those of conventional motor driven chain saws with the exception that no sprocket means need be provided on the chain. In one of the disclosed embodiments of the chain saw of the invention, the chain is so constructed that it can bend or flex in only one direction, so that the disposition of the chain, in the correct position upon a limb to be cut is assured. In another disclosed embodiment of the chain saw of the invention, the serially connected cutting means are provided with cutting edges and depth gauges on both sides of the chain, the chain then being permitted to bend in either direction. The difference in height between the tips of the depth gauges and the tips of the cutting blades determines the thickness of the chip taken by the blade. Such difference in height, which may be made different for different cutting operations, may, if desired, be made somewhat less than that employed in the chains of power-driven chain saws to decrease the effort required to reciprocate the chain manually.</p> |
