Abstract: A chain saw guide bar for a tree harvester is arranged to yield when an excessive force is applied such as when the guide bar becomes jammed in a cut. Yielding of the guide bar protects the bar holder from damage. The guide bar is heat treated or otherwise structurally modified to provide the desired yield strength.

Abstract: A guide bar mounting arrangement for a tree harvester. The tail end of the guide bar is provided with a center slot and pin receiving slot at each side thereof. A sliding block has a center boss and pins permanently or removably mounted therein at the sides of the boss and the combination is slidably mounted in a fixture or base member fixedly secured to the harvester adjacent a drive sprocket. The guide bar is fitted to the sliding block center slot receiving a center boss of the sliding block and the pin receiving slots engaging the pins of the sliding block. A saw chain is entrained around the guide bar and drive sprocket and the sliding block moved relative to the sprocket to tension the saw chain. The sliding block is forced against the base member to clamp the bar in position.

Abstract: A chain tensioner for a chain saw has a cam member in positive engagement with a flange of a plate attached to the guide bar. Rotation of the cam member forces the guide bar away from a drive sprocket of the chain saw to tension the chain. The cam member is clamped in position to maintain the guide bar in the adjusted position. Flats on the cam member in abutment with the flange resist rotation of the cam member when in the adjusted and clamped position. A slot is provided in the cam member to facilitate rotating the cam to force the guide bar away from the drive sprocket.

Abstract: A hedge trimmer blade assembly preferably a double acting assembly having upper and lower reciprocating blades. Superimposed cutting teeth extend laterally from the sides of the assembly from each of the blades. Guard portions extend from the teeth of the upper blade only on one side and from the teeth of the lower blade only on the other side. The guard portions are asymmetrical with a straight side and a tapered side, the taper preferably including a shallow bevel near the base and a sharper bevel near the tip of the guard portion. The cutting teeth of both upper and lower blades on both sides form oval shaped cutting chambers with cooperative hook configurations at the entry to the cutting chambers. The upper and lower blades are preferably identical in configuration but inverted one relative to the other in the assembly. The straight sides of the guard portions are all faced toward the power head of the trimmer to produce a hooking action as the user sweeps the trimmer during operation.

Abstract: A cutting link having a cutter portion and a depth gauge. And a guide edge extending between the depth gauge peak and cutter portion for guiding a file to sharpen the cutting edge of the cutter portion. In the process of sharpening the cutting edge, the cutter portion is abraded away along a line that furthers the guide edge and thereby continues the guiding of the file to properly file the cutting edge.

Abstract: A hand saw having cutting teeth with a depth limiting design compatable with the forces capable of being generated by an operator. The leading cutting edge is followed by a rearwardly sloping bottom surface that allows the operator to control the bite of the teeth and thereby produce a smoother cutting action.

Abstract: A gulletless saw chain having a cutting link with a cutter portion that is configured to be top sharpenable. A depth gauge portion is positioned in close proximity to the cutting edge corner of the cutter portion. The depth gauge is laterally offset to position the outer most edge of the depth gauge at the corner of the cutting edge to thereby control side penetration as well as depth penetration of the cutting edge. A drive link preceding the cutting link includes a guide portion with an inclined leading edge that corresponds with the leading edge of the depth gauge. A shallow V shaped opening is formed between the depth gauge and drive link guide portion to assist the cutting link in tracking in the kerf.

Abstract: The specification discloses a completely outside sharpenable saw chain of the chisel type in which top plate portions are sharpened on their tops and in which side cutter portions are sharpened on their outer sides. The chain has allochiral cutter teeth each having a top plate portion sloping rearwardly and downwardly and joined along one side edge to a side slitter plate portion sloping rearwardly and inwardly, a bent over shank portion, a body portion and a depth gauge portion, wherein the top plate portion, the side plate portion and the shank portion taken together are generally C-shaped in cross-section. The top plate portion has, at its top, a sharpenable end surface forming a top cutting edge ending in a corner chisel point from which a side cutting edge extends downwardly and rearwardly. The side cutting edge is formed where the sharpenable forward end surface of the side plate portion, oriented toward the outer side of the saw chain, intersects the inner face of said side plate portion.

Abstract: The specification discloses a completely outside sharpenable saw chain of the chisel type in which top plate portions are sharpened on their tops and in which side cutter portions are sharpened on their outer sides. The chain has allochiral cutter teeth each having a top plate portion sloping rearwardly and downwardly and joined along one side edge to a side slitter plate portion sloping rearwardly and inwardly, a bent over shank portion, a body portion and a depth gauge portion, the top plate portion, the side slitter plate portion and the shank portion being generally C-shaped. The top plate portion has at its top a sharpenable surface forming a top cutting edge which joins a corner chisel point from which extends downwardly and rearwardly a side slitting edge formed by a side plate sharpenable surface.

Abstract: A cutting tool for use in applications wherein a kerf is formed during the cutting operation. The cutting tooth is formed on the cutting tool including a rearwardly angled inner relief surface against which the material being cut is impacted. A secondary surface intersects the inner relief surface and extends forwardly of the point of intersection at an angle relative to the direction of cut that is oppositely directed but generally equal to the inner relief surface. The force of the material being cut that is deflected onto the secondary surface is outwardly directed and counterbalances the inwardly directed force imparted onto the inner relief surface.

Abstract: A cutting tool having cutting teeth. The cutting teeth are formed on one end of inserts that are seated in slots provided in the body of the tool with the cutting teeth projected outwardly of the slots. The inserts are produced from a resilient material that is preset in a bowed configuration with the slots having substantially straight side walls. A relief opening is provided in the bottoms of the slots and the seated inserts are forced into an open, substantially straight position with a tail section that curls into the relief opening. Flanges provided on the inserts overlap the edges of one side wall of the slots to resist lateral displacement.

Abstract: A rectangular container for a saw chain is provided with a transparent plastic lid and a foraminous bottom. Freshly sawn wood chips are placed in the container after which a movable slide is located adjacent the level of the chips. After shaking of the container, a predetermined reduction in chip level as measured by the slide will indicate that the saw chain requires servicing.

Abstract: The specification discloses a chain saw having a saw bar which is fastened to the frame of the chain saw so that most of the saw bar is outward of the chain saw frame (referred to as the forward portion), which portion is exposed for effective cutting, but with a lever portion rearward of the frame and the drive sprocket of the chain saw for improved mounting and adjustment. The saw bar forms a part of a cassette which also includes a drive sprocket trapped in the saw bar and a saw chain extending around the sprocket and the forward portion of the saw bar. A cover has clamping bosses clamping the saw bar to the frame, and an adjustment screw engaging the rearward end of the saw bar is mounted on the frame at the rear thereof so that it is readily accessible.

Abstract: The specification discloses a motor housing, with a handle of the circular saw type, and a cantilever saw bar carrying a saw chain is secured to the housing in a position extending downwardly from a guide foot of the housing. A retractable guard bar normally is held in a position holding a guard loop around the nose end of the saw bar, the guard bar being positioned at the rear of the saw bar. The guard bar is mounted slidably on the motor housing, and, when a latch is manually released, the guard loop may be pushed up along the saw during a boring (nose cutting) operation. In an alternate embodiment, a foot attachable to a foot of a circular saw motor carries a saw bar and a guard bar with a guard loop surrounding the nose end of the saw bar.

Abstract: An elongated cone like member having a pointed end and a relatively large blunt end with the intermediate portion flaring outwardly from the pointed end to the blunt end, and serrations formed in the member adjacent the pointed end. The pointed end of the member is plunged into the end of a short length log and the blunt end is struck by a driving maul. The serrations prevent the member from bouncing back out of the wood and the multi-directional flaring of the intermediate portion applies splitting pressure radially in a symmetrical pattern from the point as the member is driven into the wood to thereby split the log where it is weakest.

Abstract: A guide bar for a chain saw including a main bar portion having its outer end edge abutting a mating inner end edge of a nose portion. At least a section of one of the bar portions adjacent the abutting end edges is formed by side plates supported in a spaced apart position by spacing posts. A connecting web connects the bar portions with the said one bar portion fitting between the spaced apart side plates. The web is provided with slots to accommodate the supporting posts and displaceable ear portions extend into the slots to resist but not prevent passage of the posts. Forcing the said one bar portion over the web causes the ear portions to deflect around the supporting posts which then resists but does not prevent separation of said one bar portion from the web.