Abstract: A chain saw comprising an oil container for storage of lubricating oil, the container having an oval neck through which the container can be filled with a lubricating oil and a cap for sealing the neck of the container wherein the cap comprises a body having at least one elastically spreadable band located around the body along at least part of the length of the body and an actuating mechanism which is capable of moving the band from a relaxed inner position to a spread outer position into engagement of the inner surface of the neck of the container when the body of the cap is located within the neck of the container. The longitudinal axis of the neck can be non linear.

Abstract: A blade tensioner is configured with a base, a blade shoe having a chain sliding face provided on base, and several plate-spring-like blade springs stacked on the reverse side of the chain sliding face of the blade shoe in order to apply a spring force to blade shoe. A base part of blade shoe is provided in such a manner that it can pivot freely on the base, and a friction material is provided at the part where a tip part of the blade shoe contacts a sliding face of the base. In addition, respective edge parts of the blade springs are inserted into respective slots on the blade shoe.

Abstract: A chainsaw guide bar has tubes to convey liquid such as lubricants, fungicides, paints, etc. The tubes, made of soft deformable metal, are placed in respective grooves formed in the guide bar and are then deformed. The grooves include an undercut side, whereby a portion of the deformed tube is held in its groove by an interference bit defined by the undercut side and a portion of the deformed tube situated behind the undercut side.

Abstract: Disclosed is a chain saw which includes a chain saw chain braking system. The chain saw has a continuous chain channel guide which includes provision to impede the slideability of a chain saw chain in the continuous chain channel guide.

Abstract: The present invention relates to a chain saw having a chain bar portion extending forwardly from a main body. The chain saw comprises an attaching portion to which a suspension member is to be attached, and the attaching portion is arranged in the vicinity of a corner portion, where a back surface and a bottom surface of the main body meet with each other, so that a longitudinal center axis of the chain bar portion may be at an angle of not greater than 20 degrees from a vertical line.

Abstract: A chain saw includes a chain arranged on a saw flange (5). The chain saw is usually arranged in a multi-purpose head of forestry machinery by a mounting flange (1) immobile in regard to the multi-purpose head, whereby the chain is rotated by a chain wheel (4) controlled by a power unit. In order to tighten the chain, the saw flange, or a relevant part of the chain saw comprising the same, is arranged to move parallel with the longitudinal axis (A) of the saw flange in regard to the chain wheel. This is achieved by a tightening device and at least one supporting guide therein which are attached to the mounting flange of the chain saw or a structure arranged therein. By arranging the supporting guide in the tightening device to extend onto both sides of the center of the chain wheel parallel with the longitudinal axis of the saw flange, the saw flange is made to move in a completely supported manner parallel with its longitudinal axis in regard to the chain wheel.

Abstract: In order to design a motor chain saw with a chain brake device releasable as a back kick brake and as a coasting brake comprising a tension lever (2), movable with respect to the housing of the motor chain saw, which can be moved between a brake position (B) and a ready position (b), a release lever (19) which can take up a coasting brake position (A) and a disengaging position (f), in combination with a supplementary brake device known as a coasting brake, it is proposed that the tension lever (2) is placed linearly slidingly movable with respect to the housing of the motor chain saw and that the release lever (1) is placed slidingly movable with respect to the tension lever (2), whereby both axles of the sliding movement are parallel to each other.

Abstract: A chain saw (1) includes a guide bar (5) supporting a chain (7) and attached to a main body (3). Disposed within the body is an anchor bolt (9) for securing the guide bar to the main body. Disposed within a sprocket cover (8) is a hexagonal nut (11) screwed onto the anchor bolt. Furthermore, provided coaxially with the hexagonal nut is a cylindrical element (15) having a hexagonal cavity (13) that engages the hexagonal nut and is axially movable and rotatable about the same axis as the hexagonal nut. Also provided is a lever (17) disposed at the outer end of the cylindrical element. Provided within the sprocket cover are an adjustment pin (19) engaging the guide bar, a screw stock (20) onto which the adjustment pin is threaded and which extends in the axial direction of the guide bar, a first helical gear (21) disposed at one end of the screw stock, and a second helical gear (23) meshing with the first helical gear. Further provided is a rotating element (25) coaxial with the second helical gear.

Abstract: A guide for a concrete cutting chain saw. The guide has multiple paired slots which receive a post of a bracket mounted to the chain saw. The slots provide multiple pivotal mounts for the chain saw. The chain saw is mounted on the guide with the post being received in a pair of slots. The multiple slots provide sequential pivotal mounts for moving the saw to complete the cut. The post is mountable on either end of the bracket so the guide may be mounted on either side of the cut line.

Abstract: An easily engageable and releasable chainsaw bar guard for protecting an individual carrying a chainsaw and for preventing damage to the cutter chain and saw dogs of a chainsaw. The bar guard comprises an elongated stiff hollow sleeve whose interior space is just slightly larger than the bar and chain to be protected. The sleeve has an opening at the proximal end for sliding the sleeve onto the guide bar, and is closed at the other end to protect the end of the bar and cutter chain. A snap-clip mechanism is fixed to the sleeve for releasably latching the proximal end of the guard to the chainsaw. The snap-clip mechanism biases a retaining claw into contact with the chainsaw bar between the nuts on the saw bar attachment/adjustment bolts. The sleeve and the snap-clip mechanism can be selectively configured to accommodate chainsaw bars of different shapes and dimensions and the spacing of whose guide bar adjustment nuts varies.

Abstract: A portable power working machine has an L-shaped top handle having a top grip portion that is attached to the front portion of the top of a main housing and extends longitudinally above and parallel to the top of the main housing and a rear coupling portion that is attached to the rear portion of the main housing. A side handle has a front grip portion that is connected directly to the front end of the top grip portion of the top handle and a diagonal grip portion that extends diagonally straight as viewed in side elevation from the front grip portion toward the lower end of the rear coupling portion of the top handle. The lower end of the diagonal grip portion of the side handle is connected directly to the rear coupling portion of the top handle.

Abstract: A portable power working machine has an L-shaped top handle having a top grip portion that extends longitudinally above and parallel to the top of a main housing and a rear coupling portion that extends along the rear portion of the main housing. A side handle has a front grip portion that is joined to and extends horizontally and laterally from the front end of the top grip portion of the top handle and a diagonal grip portion which curves out and down from the front grip portion and extends diagonally straight as viewed in side elevation from the front grip portion toward the lower end of the rear coupling portion of the top handle. A starting footstool contiguous to a lower end of the diagonal grip portion extends horizontally to the vicinity of and is joined to the lower end portion of the rear coupling portion of the top handle.

Abstract: The invention relates to a portable handheld work apparatus such as a motor-driven chain saw, a cutoff machine, a brushcutter or the like. The work apparatus includes an internal combustion engine (1) mounted in a housing (2) which drives a work tool via centrifugal clutch (3). The centrifugal clutch (3) includes a carrier (5) driven by the engine (1). The carrier (5) has rpm-dependent displaceable centrifugal weights (6) which are displaceable against a return force and come into contact engagement against a contact wall (7) of an output part (8) so as to transmit torque. A rotationally-elastic damping element (11) is arranged between the output part (8) and an intermediate element (10) connected to the tool (4) so as to rotate with the intermediate element (10).

Abstract: A mounting mechanism for an adjustable component that is to be held against an abutment surface of a housing, especially for the guide bar of a power chain saw, is provided. The mechanism includes at least two bolts that are provided on the housing, are spaced from one another, and project beyond the abutment surface of the housing and into an elongated opening of the component. At least one device is provided that extends into a gap between one of the bolts and at least one of the longitudinal edges of the elongated opening for engaging such at least one longitudinal edge.

Abstract: A chain saw guide bar has a pair of elongated chain guide plates, which are superimposed with each other and receive a saw chain. Positioning slots extend in the longitudinal direction of the guide plates and receive a pair of fixing stud bolts that project from the main body of the chain saw. A chain-tightening device, which is incorporated into the guide bar, includes a pulley carried by the guide plates in a fixed position distally of the guide slots. One end of a flexible wire is connected to the pulley. The other end of the flexible wire is connected to a circular ring that is slidably received between the guide plates with an opening thereof at least partly registering with the positioning slots. The ring is received on one of the fixing stud bolts. An intermediate portion of the wire is turned partway around a returning member that is stationarily located on a portion of the guide bar proximally of the fixing stud bolt that receives the ring.

Abstract: A chain saw comprises interconnected center links and side links. The side links include front and rear heels having front and bottom contact surfaces, respectively, which slidably engage an edge rail of a chain saw guide bar. The bottom contact surface of at least one of the heels includes a recess formed therein. The recess has an open front end and a closed rear end. The recess is of less width than a width of the respective bottom contact surface, whereby portions of the contact surface straddle the recess. The depth and width of the recess gradually decrease from the front end toward the rear end. During a cutting operation, lubricant enters the recess and creates a pressure which lifts the heel slightly off the rail, eliminating metal to metal contact.

Abstract: A chain saw guide bar with at least one internal channel for spraying the sawn surface with liquid through nozzles, where the channel is extended in front of the nozzles by an end portion terminated by a closeable cleaning hole with a larger section than the nozzles and usable for cleaning the channel with compressed air or liquid.

Abstract: A chain tension device for tensioning a cutting chain of a chain saw utilizing a guide bar having an outer periphery and a drive sprocket. The chain saw body supports the guide bar, the sprocket and a drive source. A cutting chain is wound around the sprocket and the outer periphery of the guide bar and a leaf spring is supported by the chain saw body and interposed between the guide bar and the sprocket. The leaf spring abuts and biases the guide bar away from the sprocket so as to apply automatically an appropriate amount of tension to the cutting chain.

Abstract: The invention is directed to a low vibration and low noise cutter arrangement for a motor-driven chain saw. The cutter arrangement includes a guide bar and a saw chain. The guide bar has a guide groove for the saw chain which extends along the peripheral edges of the guide bar. The saw chain includes center links and side connecting links which are pivotally connected to each other. The connecting links on the right-hand and left-hand sides of the saw chain include cutting links and side links which are displaced relative to each other. The center links are provided with respective rakers which engage in the guide groove and can be driven in the longitudinal direction of the guide bar by a drive sprocket. The connecting links are supported with slide surfaces on the peripherally extending guide surfaces which lie at both sides of the guide groove.

Abstract: A cutting assembly for a motor chainsaw has a guide bar with peripheral guide groove and guide surfaces. A saw chain circulates in the guide groove in a longitudinal direction of the guide bar. The saw chain has chain members such as centrally arranged drive members and connectors, laterally connecting the drive members. Some of the connectors and some of the drive members are embodied as cutters arranged alternatingly on opposite sides of the saw chain. Rivets connect the chain members pivotably to one another and extend transversely to the circulating direction. The drive members engage the guide groove and the connectors are slidably supported on the guide surfaces. Each cutter has a base, a support stay connected to the base, and a cutting tooth connected to the support stay. The cutting tooth has a laterally projecting roof portion having a leading end in the circulating direction with a roof cutting edge.

Abstract: A cutter head assembly for a motor chain saw has a cutter head housing and a drive shaft mounted in and projecting from the cutter head housing. A drive pinion is mounted on the portion of the drive shaft projecting from the cutter head housing. A guide bar having a first end positioned adjacent to the drive pinion is provided. A saw chain is driven by the drive pinion and circulates on the guide bar. A cover covering the drive pinion and resting at least in an area of outgoing deflection of the saw chain at a housing wall of the cutter head housing defines a cuttings chamber open toward the guide bar. The first end of the guide bar is clamped between the housing wall of the cutter head housing end the cover. The cover has a cuttings ejection opening opposite the housing wall in the vicinity of the area of outgoing deflection. The cuttings ejection opening has a rim extending in a circulating direction of the saw chain and a ramp projecting from a first portion of the rim into the cutting chamber.

Abstract: A chain saw is provided that comprises a motor which rotatingly drives a cutting chain via a sprocket mounted on a spindle (34) via a clutch mechanism. When the clutch mechanism (17) is engaged, a pivotal handle guard (22) interacts with the clutch mechanism to disengage the clutch mechanism (17). The clutch mechanism is biased towards disengagement. An actuating means (8, 68) is provided such as a switch which is releasably connected via a pin located within a groove to the clutch mechanism (17). The actuating means can override the biasing force to engage the clutch (17) when the actuating means (8, 68) is connected to the clutch (17). The pivotal handle guard (22) is configured so that it interacts with the pin wherein, when the pivotal handle guard (22) is activated, it detaches the actuating means (8, 68) from the clutch mechanism (17) by knocking the pin out of the groove.

Abstract: A chain saw guide bar including a chain tightening mechanism. A shaft or rack slidable within the bar body includes a head portion slidable rearwardly against a bar mounting stud. The head portion resides between opposed edges formed in the bar body and the head portion includes fingers that straddle the mounting stud. Rearward sliding of the shaft or rack against the stud produces a lateral force urging spreading of the fingers to produce wedging of the fingers between the opposed edges and the stud. Such wedging of the fingers produces resistance to return sliding of the shaft and retains the tightened condition of the chain.

Abstract: A chain saw guide bar has self-contained mechanism to force movement of the guide bar away from a drive sprocket to tension the saw chain. The mechanism includes a bearing surface that engages a mounting stud on the chain saw housing and a rotatable portion which upon rotation causes axial displacement of the bearing surface in contact with the stud.

Abstract: A chain saw includes a chain formed into a closed loop about a drive sprocket and a support bar. A first piston is operable to move the support bar radially away from the drive sprocket, and a second piston is operable to limit such movement.

Abstract: A portable, hand-guided working tool has a drive motor and a motor housing in which the drive motor is housed. The motor housing has a front side and a rear side when viewed in the direction of the longitudinal center axis of the working tool. A tool member is connected to the front side of the motor housing and extends forwardly in the direction of the longitudinal center axis. The tool member is driven by the drive motor. The rear grip is connected by vibration damping elements to the rear side of the motor housing and extends rearwardly in the direction of the longitudinal center axis. An abutment device includes a first abutment member connected to the motor housing and positioned between the rear end and the rear grip and includes a second abutment member connected to the rear grip and cooperating with the first abutment member for limiting a relative movement between the motor housing and the rear grip.

Abstract: An excavating machine includes a main frame, an endless digging chain, and a boom. The boom is mounted to the main frame and is adapted to carry the digging chain. The boom includes an upper surface, a lower surface, an inner end and outer end. The surfaces are adapted to slidably engage the chain. A drive sprocket is mounted to the main frame and is disposed at the inner end of the boom for engaging the chain. A wear plate is mounted to the boom and is disposed between the drive sprocket and the inner end of the boom for slidably engaging the chain between the drive sprocket and the upper surface of the boom inner end.

Abstract: A chain saw includes a motor unit and a guide bar clamped thereto by a clamping plate. The guide bar, which supports a saw chain, has a longitudinal slot formed therein. Clamping bolts carried by the motor unit pass through the slot and through the clamping plate for securing the clamping plate to the motor unit. One (or both) of the side edges of the slot includes corrugations. The clamping plate includes a hole aligned with the corrugations to enable a toothed key to be arranged in meshing engagement with the corrugations whereby a rack-and-pinion relationship is formed. By manually rotating the key, the guide bar is longitudinally displaced for varying the tension on the saw chain.

Abstract: A plastic handle member for manually guided power chain saws is provided. The handle member comprises a one-piece, at least partially tubular, front handle for holding a separate motor unit, the front handle being provided with a lower profiled bar. A rear control handle is provided having an upper portion for accommodating components for controlling a chain saw. A support member is disposed between the front handle and the control handle for interconnecting them. The front handle, the rear control handle, and the support member comprise a one-piece plastic body made of a single material and in conjunction with the lowered profile bar form a self-contained force polygon that absorbs load and vibrational forces by means of vibration-damping elements provided in supports disposed between the handle member and a housing of the separate motor unit for holding the housing of the motor unit.

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: A hand-guided working tool has a telescopic rod with a first and a second end. A drive motor is connected to the first end of the telescopic rod. A working tool, connected to the second end of the telescopic rod, is driven by the drive motor. The telescopic rod includes an outer tube and an inner tube inserted with an inner end into the outer tube and displacable in the longitudinal direction of the telescopic rod. A first clamping member is connected to the first end of the outer tube for fixing the axial position of the inner tube. The inner tube has an outer mantle surface and the outer tube has an inner circumferential surface. The outer mantle surface is spaced at a radial distance from the inner circumferential surface. A first cylindrical bearing body is supported on the inner end of the inner tube. The first bearing body is displacably supported in the outer tube.

Abstract: A ruler attachment device for a chain saw. The device includes a ruler telescopingly received in a tubular member so that it may be compactly stowed when not in use. The tubular member is attached to a bracket, which is attached to the chain saw housing, so as to pivot between a first position in which the tubular member is normal to the chain saw housing for measuring length of wood being cut and a second position in which the tubular member may be compactly, quickly, and easily stowed out of the way alongside the chain saw housing without removing the attachment from the chain saw, yet be easily and quickly pivoted back to the first position to be put back into use.

Abstract: The invention is directed to a cutterhead for an overhead branch cutter. The cutterhead includes a work tool and a gear assembly housing having a lower housing part and an upper housing part defining a closure cover for the lower housing part. A gear assembly is mounted in the housing and includes an input shaft and an output shaft disposed transversely to the input shaft. A first bearing unit journals the input shaft and a second bearing unit journals the output shaft in the gear assembly housing. Intermeshing gears are mounted between the input shaft and the output shaft. The lower housing part and the upper housing part conjointly define a partition plane partitioning the first and second bearing units. A one piece attachment flange is formed on the lower housing part and the output shaft has an outer end extending through the attachment flange. The work tool is mounted on the attachment flange and is operatively connected to the outer end of the output shaft.

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 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 portable power tool includes a power module and a tool module, e.g., a chain saw module which is attached to the power module and which can be readily exchanged with another tool module, e.g., a cutter module. The power module includes a power source such as two-stroke gasoline engine with a drive shaft. To facilitate rapid exchange of tool modules, there are two or more torque transmission members such as a pulley and a sprocket wheel on the drive shaft, so that different tool modules can be attached to the power module without removal and replacement of the torque transmission member.

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 guide bar for a saw chain of a motor chain saw has a single member steel plate having a center plane and a circumferential guide groove for guiding a saw chain extending in the center plane. The steel plate has a longitudinal extension and a height perpendicular to the longitudinal extension. The steel plate has a cutout extending over a portion of the longitudinal extension and over a portion of the height. A filling member, consisting of a casting material having a smaller density than the steel plate, is cast into the cutout. The cutout has a circumferential edge facing the filling member. The circumferential edge has undercuts uniformly distributed along the circumferential edge. The filling member has a shrinkage rate of at least 0.5% for engaging positive-lockingly the undercuts upon solidification of the casting material to thereby create a uniformly distributed pretension within the center plane of the guide bar in the unloaded state of the guide bar.

Abstract: A hand-guided working tool has a telescopic rod with a first and a second end and a drive motor connected to the first end. A working tool is connected to the second end of the telescopic rod. A telescopic drive shaft is enclosed in the telescopic rod. A first end of the telescopic drive shaft is connected to the drive motor and a second end of the telescopic drive shaft is connected to the working tool. The telescopic rod has an outer tube and an inner tube inserted with a leading end into the outer tube. The inner tube displaceable in the longitudinal direction of the telescopic rod. The telescopic drive shaft has a shaft tube and a shaft rod enclosed in the shaft tube. At least two bearings are arranged in the outer tube for rotatably supporting the telescopic drive shaft. They are spaced from one another in the longitudinal direction of the telescopic rod.

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 powered pruning saw is disclosed in which a drive motor is connected to an elongated drive shaft rotatably held within an shaft or pole. A gear head is mounted at the other end of the pole to the remote end of the drive shaft. The gear head includes a gear housing formed of two housing halves, with a pinion rotatably mounted by a pinion bearing within the gear housing for coaxial rotation with the drive shaft. The pinion shaft mounts the pinion at one end and a drive shaft receiver at a remaining end for releasably receiving an end of the drive shaft. A cutter arbor shaft is also rotatably mounted in the gear head, and mounts a gear in meshing engagement with the pinion. A cutter arbor shaft bearing mounts the cutter arbor shaft and gear for rotation about a cutter arbor shaft axis that is angularly offset from the drive shaft axis. A cutter is releasably attached to the cutter arbor shaft.

Abstract: The invention relates to an antivibration device between a motor unit 2 and a handle unit 9 of a portable handheld motor-driven chain saw 1. The antivibration device includes a sleeve-shaped elastic base body 6 having one of its ends 36 in a receptacle 20 of the motor unit 2 and the other end 46 in a receptacle 90 of the handle unit 9. The ends (36, 46) of the base body are fixed in the receptacles (20, 90) by axially engaging plugs (31, 41) in the end sections (30, 40). The guiding characteristics of the motor-driven chain saw are not affected by base bodies which become damaged or soft. This is so because at least one of the stops 31 has a coupling member 50 which bridges an axial spacing (z) between the plugs (31, 41) and projects into the other plug 41 and is latched so that it cannot be axially separated therefrom. A mechanical connection remains between the handle unit and the motor unit when the base body tears off.

Abstract: Drive sprocket device for a chain saw, comprising a rim type sprocket located eccentrically in a ring. The ring has recesses on its outside periphery to receive tangs of drive links of a saw chain, and cylindrical surfaces to support the chain radially. On the inside periphery of the ring there are radial protrusions and cylindrical surfaces. The sprocket has recesses to receive the protrusions, and cylindrical surfaces in contact with the cylindrical surfaces formed on the inside periphery of the ring. Alternatively, the recesses in the ring could constitute through-holes, and the tangs of the drive links could extend through the through-holes to constitute the protrusions received in the sprocket recesses.

Abstract: A gear housing is arranged at or by the center of a main body housing of a chain saw and a handle housing extends backward therefrom. A motor housing is formed on the left side of the gear housing perpendicularly. A support member and a cover are attached on the right side of the gear housing. A guide bar extends forward from the main body housing and the guide bar retrains an endless saw chain therearound. The handle housing includes a trigger beside a connecting portion between the handle housing and the gear housing. A battery is disposed in a detachable manner at a rear end of the handle housing.The center of gravity of the chain saw is located at or by the trigger of the handle housing.

Abstract: A guide bar for a saw chain has a sort-shaped base member made of solid material, having a front end with a deflection area for a saw chain and a rear end for connecting the guide bar drive unit. The base member has outer lateral surface extending from the front end to the rear end and a longitudinal central axis extending from the front end to the rear end. The base member has a main body and a separate front member welded to the main body so as to have a welding seam on at least one of the lateral surfaces. The base member has an edge with a continues circumferential groove for receiving and guiding the saw chain.

Abstract: A chain saw guide bar having a lubricant feeding structure is capable of providing sufficient lubrication to the guide bar tip portion and has sufficient strength and durability during use over an extended period of time and, at the same time, has the weight of the guide bar reduced. The chain saw guide bar is made of a single plate and is provided with a lubricant supply port made in a base end portion of the guide bar surface, a bottomed recess groove running continuously from the lubricant supply port to a tip portion and bottomed holes located on the bottomed recess groove. The side walls of the holes and the recess groove are tilted to increase the widths of the cross sections of the recess groove and the hole toward the bottom.

Abstract: A guide bar coding system which permits a user to easily and correctly match a saw chain to a saw guide bar. The guide bar has a laminate or multi-layer structure, and includes a recessed surface that is colored or painted to define guide bar indicia which is indicative of characteristics of the guide bar. Replacement saw chains have saw chain indicia which indicate characteristics of the saw chain. A user selects an appropriate replacement saw chain by matching the saw chain indicia to the guide bar indicia.

Abstract: A guide bar for a saw chain of a motor chainsaw has two side plates having a longitudinal extension. At least one longitudinal stay for fixedly connecting the side plates to one another is provided such that the side plates are positioned substantially congruent and parallel to one another and define a peripheral guide groove therebetween. The longitudinal stay preferably extends in a direction of the longitudinal extension over most of the longitudinal extension of the side plates. The longitudinal stay has contact surfaces and the side plates have support surfaces extending perpendicular to the center plane of the guide bar extending parallel to the side plates. The contact surfaces rest on the support surfaces.

Abstract: A guide bar for a motor chain saw has a guide bar member having a peripheral guide groove and peripheral shoulders for guiding a saw chain in the peripheral direction of the guide bar member. The drive members of the saw chain engage the guide groove and the lateral connecting members of the saw chain are guided on the shoulders. Wear protectors, made of a material that is more wear-resistant than the guide bar member, are provided. The wear protectors are connected to the peripheral shoulders so as to extend at least over a portion of the guide bar member in the peripheral direction. Each wear protector has a first wear surface facing the drive members of the saw chain and a second wear surface facing the lateral connecting members of the saw chain. At least one of the first and second wear surfaces of each wear protector has at least one peripheral recess extending in the peripheral direction.

Abstract: A chain saw guide bar having identifying indicia to aid in the selection of a replacement guide bar and/or saw chain. A colored insert is installed in an aperture of the guide bar. The insert is colored to indicate the proper type of chain for the guide bar. Characters are stamped into the insert to indicate the mounting tail of the guide bar and the length of the saw chain required for the guide bar.