Abstract: A chain saw guide bar includes outer side surfaces, a longitudinal groove having side walls, and two edge surfaces. Each edge surface interconnects a side wall and an outer side surface to form therewith inner and outer corners, respectively. To edge-harden the guide bar, the edge surfaces, inner corners, and outer corners are heated above 750.degree. C. Then, the edge surfaces and inner corners are rapidly cooled, i.e, quenched, but the outer side surfaces are cooled more slowly, whereby the inner corners are given a higher hardness than the outer corners.

Abstract: Chain saw guide bar comprising three plates joined by welding, having a nose, a clamping area and a guiding groove for the chain, where the bending stiffness in a zone immediately in front of the clamping area is increased by omitting welds in the zone to make sure that the compressed plate buckles outward when overloaded. The zone extends in the longitudinal direction of the bar for a distance greater than the groove depth and less than the bar width.

Abstract: A nose sprocket for chain saws includes an inner peripheral surface defining a bearing race, and teeth disposed at an outer peripheral portion of the nose sprocket. Side surfaces of the nose sprocket are provided with a vapor-deposited low-friction coating, except that the inner peripheral surface and a portion of each side surface adjoining the inner peripheral surface are free of the coating.

Abstract: A chain saw includes a drive unit having a drive shaft, and a chain guide bar mounted to the drive unit by two bolts. The guide bar is attached to the drive unit by an insert structure which fits into a longitudinal slot of the guide bar. The insert structure can be oriented in at least two different orientations within the slot for establishing different positional relationships, respectively, between the drive shaft and a longitudinal center line of the guide bar. For example, the center line could be offset either above or below the drive shaft, or the center line could intersect the drive shaft.

Abstract: A guide bar for a chain saw includes a pair of side plates and a center plate disposed therebetween. Each of the side plates includes spray holes through which a liquid can be sprayed. Liquid-conducting tubes are mounted in a longitudinal center slot of the center plate, and outlet ends of the tubes are connected to the spray holes of one of the side plates. Inlet ends of the tubes are connected to fittings mounted in a rear end of the guide bar to enable the tubes to receive liquid from a liquid source. A worn guide bar can be reversed, while still permitting the spraying to be performed. That is, while the guide bar is being reversed, the tubes are removed to enable the fittings to be reversed. Then, the inlet ends of the tubes are reconnected to the fittings, and the outlet ends of the tubes are connected to the spray holes formed in the other side plate.

Abstract: A drive mechanism for a chain saw has a minimal vertical height. The drive mechanism is particularly useful for timber harvesting vehicles, and includes a drive motor, a holder with a clamping mechanism for clamping a chain saw guide bar, a bearing assembly allowing the holder to rotate in relation to the motor and a swivel device to convey liquid from the motor to the guide bar through closed channels and grooves. The bearing assembly and the swivel device have openings having sufficiently large inner diameters such that the bearing assembly and the swivel device fit around the motor, thereby avoiding the need for mounting those elements on top of one another.

Abstract: A chain saw guide bar is formed of a middle plate and a pair of side plates affixed on opposite sides of the middle plate. One (or both) of the side plates carries nozzles for emitting liquid dyes of different respective colors. Channels for conducting liquid dyes to the respective nozzles are formed by grooves cut in the interface between the middle plate and a side plate. Each channel is surrounded by a laser weld which completely isolates the channels from one another to avoid mixing the colors. The laser welds also secure the middle and side plates together. Additional laser welds secure the middle and side plates together, the additional laser welds being discontinuous.

Abstract: Chain saw guide bar and method of using a guide bar for spraying liquid on a sawn surface through a plurality of orifices formed in a guide bar side plate. The liquid is introduced into an inlet portion of a passage formed in a center plate of the guide bar and is conducted forwardly to the orifices. The liquid is sprayed from the orifices at equal pressures, and in spray directions having a component oriented parallel to a centerline of the guide bar. Thus, by adjusting the velocity of the sprayed liquid, the length dimension of the area sprayed can be adjusted.

Abstract: A saw chain of a chain saw is driven by a drive sprocket assembly including a drive sprocket and a pair of separate drive rings arranged coaxially and rotatably on the drive sprocket. Drive links of the saw chain extend through an annular space formed between the drive rings and enter recesses formed in the drive sprocket to be driven thereby.

Abstract: Guide bar for chain saws, where the chain is supposed by a nose sprocket while traversing the front end. Regions of the edges of the guide bar are locally hardened to a higher hardness than the rest of the guide bar. The regions of hardness are only where the chair impacts the bar near an attachment end of the guide bar after having left the drive sprocket of the power socket, and where the chain settles on the guide bar edge after having been supported by the nose sprocket while traversing the nose curvature.

Abstract: A chain saw guide bar allowing spraying of the cut surface of a stump with liquid, is made from three joined plates with a spraying device comprising one or more supply channels provided as cutouts in the central plate. A plurality of spraying holes are provided in one or both side plates. The spraying holes are offset towards the guide bar edge so far that less than the entire area of spraying hole area overlaps the edge of the supply channel.

Abstract: A mounting base for chain saw guidebars, comprising a plate (11) with a slot (14) in which a guide piece (36) can slide in the lengthwise direction of the guidebar, said guide piece being acted on by one or more pistons (17) energized by a self-contained pressure source (19) preferably comprising a gas spring, and a valve device (18) which can be set in different positions, during sawing urging the guidebar outwards with a predetermined force and preventing displacement inwards, and during changing of saw chain or guidebar permitting displacement inwards of the guidebar while preventing the pistons (17) from urging the guidebar outwards.

Abstract: A planting tool for plants comprises a tube having a fixed beak half at its lower end. A hinged beak is hinged to the tube such that the fixed and hinged beak halves together form a beak capable of being pressed into the ground. The beak is then opened to make a hole in the ground for the plant, and is latched in the open position by the drawbar of a latching mechanism. The drawbar is attached to the hinged beak half and arranged to slide along an outside surface of the tube as the beak is opened and closed. The drawbar slides within a protective rail that is affixed to the outside of the tube to avoid being damaged or obstructed. The upper end of the drawbar extends above a reference edge of the rail when the beak is closed, and extends below that edge when the beak is open, thereby providing a visual indication of the condition of the beak. A handle for lifting and aiming the tube is adjustably attached to the rail to be adjustable to the height of the operator.

Abstract: A sawing apparatus includes a guide and a pair of oppositely reciprocable saw blades mounted in a groove of the guide. Mounting portions of the saw blades disposed within the groove slidingly engage one another within an interface plane. Each saw blade includes a cutting portion disposed outside of the groove and carrying outwardly set teeth and inwardly set teeth. The inwardly set teeth extend toward and beyond the interface plane. Feed forces can be applied from the guide to the saw blades by inclined end edges of plates which form the guide. The end edges are inclined obliquely so as to face away from the interface plane and engage correspondingly inclined surfaces of the saw blades. Alternatively, feed forces can be applied to back shoulders of the mounting portions of the saw blades by a member which extends between the guide plates within the groove.

Abstract: Sawblade for a powered saw with of the type in which two of the sawblades reciprocate side-by-side in a groove on the underside of the guidebar. A downward force from the guidebar is transmitted to a plurality of short longitudinally spaced ledge section projecting from the outer side faces of the sawblade. The ledges are formed by outwardly bent portions of the sawblade. The ledges can be slightly convex as viewed from the side.

Abstract: A chainsaw guidebar comprises an elongate guidebar body replaceably secured to a nose part. The guidebar body is provided with a central extension, the shape of which matches a corresponding forwardly tapering recess in the nose part. Portions of the nose part longitudinally overlap portions of the guidebar body.

Abstract: Sawblades for cutting materials containing abrasive grains or fibers with a power saw utilizing two reciprocating sawblades in contact with each other guided by a groove in a guidebar, all teeth on one blade pointing forwards and all teeth on the other blade pointing backwards. The teeth are located with unequal distances chosen so that two teeth on the first blade will not simultaneously be opposite two teeth on the other blade with the same distance as the teeth on the first blade.

Abstract: A device for a motorized saw wherein the saw guide bar consists of a reciprocating toothed saw blade (13) and a relative to this stationary support plate (12). One circular disc (14) is loosely laid into an elongated recess (15) in the support plate (12) such that it is movable relative to the support plate (12) as well as to the saw blade (13) and therefore the friction against the support plate is diminished.