Abstract: The invention relates to a motor chain saw having a guide bar clamped between the housing and a clamping piece. The chain saw has a drive motor arranged in a housing and the drive motor drives a saw chain running on a guide bar. The guide bar is clamped to the housing at one end between the housing and a clamping piece with the clamping being transverse to the plane of the guide bar. For tensioning the saw chain, the guide bar is displaceable in the longitudinal direction thereof by means of a chain tensioning device when the clamping piece is loosened. If high forces act on the guide bar, then the latter slips toward the sprocket wheel in the longitudinal direction notwithstanding the fact that the guide bar is clamped to the housing. Accordingly, the saw chain must be again tensioned by means of the chain tensioning device.

Abstract: A drive transmitting extension structure and a chain saw having the drive transmitting extension structure. The chain saw also has a drive motor and a cutting head, both engaged to the drive transmitting extension structure. The drive transmitting extension structure has a first receiver member for being removably connected to the drive motor; a second receiver member for being removably secured to the cutting head; and an upper tube and a lower tube which are connected to the first and second receiver member. A drive chain is engaged to the drive motor and to the cutting head and passes through the upper tube and the lower tube. A first and second spacer member are connected to the upper and lower tubes. A first and second bolt engages adjustably the first and second spacer members respectively for holding the upper and lower tubes in the first and second receiver members.

Abstract: A power working machine having a main body case in which a prime mover is housed, a front handle and a rear handle which handles are gripped by the operator. The front handle has a flat cross-sectional shape reduced in thickness in a direction in which the front handle faces the main body case while being increased in width generally in the longitudinal direction of the machine body.

Abstract: Portable, motor-driven cutting device, especially motor saws or hedge-shears with a housing with support handle and operating buttons at the back section and cutting devices at the front section, as well as with at least one operating grip to be set, angled or freely adjustable about a first axis which runs in the main parallel to the cutting plane and which serves to adjust the cutting plane whereby the handle can be adjusted to the housing about at least one additional axis vertical to the cutting plane that locking for the turn and adjusting position about the first axis is effected if facing notches and counter notches of the handle and housing catch form-fit and/or friction tight due to adjusting around the additional axis.

Abstract: A guidebar for powered saws comprises three plates joined by spot welding, where the outer plates are made from a hardenable steel with carbon content over 0.5 percent without boron and the middle plate from a boron alloyed steel with a carbon content lower than 0.25 percent, thus simultaneously achieving high wear resistance at the chain groove, high strength at the spot welds and high resistance to bending.

Abstract: The invention is directed to the handle of a portable handheld tool such as a motor-driven chain saw. The handle is configured as a plastic body homogeneous with its bearing portions. The handle is for the most part hollow and can be configured as a unit to include further functional portions such as recesses for vibration attenuators, air guide portions and the like. The plastic handle is especially suited for portable handheld motor-driven chain saws.

Abstract: The invention relates to a guide bar having a main member made of solid material for a motor chain saw. The guide bar has two flat sides and narrow edges defining a saw chain path. A cutout extends through the main member of the guide bar for reducing weight. The openings in the main member defined by the cutout are closed by cover plates for maintaining the stiffness and are attached to the main member of the guide bar. A fill body is seated in the cutout with an approximately precise fit and is connected to the cover plates in a force-transmitting manner. In this way, a higher torsion stiffness is obtained while at the same time retaining the reduction in weight.

Abstract: A measuring and guiding attachment for a chain saw includes a plurality of parts and is easily stored and deployed. The attachment has a swing arm assembly that is mounted on a front handle bar of the chain saw and a caliper plate attached to the distal end of that swing arm assembly. The swing arm assembly includes an end mortise and tenon joint and a telescoping joint, and the caliper plate is movably attached to the swing arm assembly so that the attachment has a plurality of degrees of freedom. A limit stop assembly is also included to permit further adjustment of the attachment.

Abstract: There is disclosed a power-driven chain saw converted from a stripped-down power-driven circular power hand saw which has a unitary housing adapted to be mounted on the power unit of the stripped-down power-driven hand saw. The housing is offset axially to provide a relatively wide area on one side having a window therein through which sawdust is deflected. Support-bar mount is an integral part of the housing as are a sawdust deflector, an oil reservoir, and a support-bar mounting boss. A sprocket is splined to a hub from which it is easily removable and which, in turn, is splined to the drive shaft with a more firm splining. A cover is provided for the housing which closely conforms to the chain and has an axially disposed dent or impression therein to accommodate the hub of the sprocket.

Abstract: In order to construct a rail supporting means on the casing for a power driven chain saw in such a way that, when the saw chain is placed in position, the saw rail is already retained relatively firmly and is adjustable by means of the saw chain tightening device, a casing for a power driven chain saw is provided with a drive unit driving the saw chain revolvingly via the saw rail with a rail supporting means with two fastening bolts penetrating a slot-like aperture constructed in the saw rail and a saw chain tightening device arranged within the area of the rail supporting means and a sprocket wheel cover which can be secured to the casing that overlaps and covers the rail supporting means, the sprocket wheel cover (10) being constructed in two portions and comprising a protective cover (20) and a clamping cover (30), the clamping cover (30) being provided with two perforations (12a, 13a) through which the bolts (12,13) are able to penetrate and it being possible for said clamping cover to be mounted by mean

Abstract: The invention is directed to a saw chain for a motor-driven chain saw equipped with a guide bar and for which lubricating oil is continuously supplied during operation. The oil reaches the guide groove of the guide bar and is directed to the pivotal joints of the saw chain. The oil is taken up by the foot portions of the center links of the saw chain which engage the guide groove. Groove-like channels are provided in a side face of these foot portions via which the lubricating oil is conducted to the pivotal joints. Lubricant pockets are provided in the foot portions of the center links of the saw chain which are supplementary to the channels so that the center links can take along a greater quantity of lubricant. This lubricant then reaches the pivotal joints through the channels especially at the forward end of the guide bar where the saw chain changes direction.

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: An improved pruner having a housing assembly provided with telescoping sections, a telescoping drive shaft assembly contained within the housing, a cutting head at one of the drive shaft assembly, and a power source at the other end and further including, as an improvement, a power driven gear system including reduction gears and reversing gears, and a worm drive engaging a rack mounted upon the telescoping sections of the housing for extending or collapsing the housing and hence the pruner. A shift lever adjacent a pruner handle actuates the worm drive to extend or collapse the pruner to provide a pruner of desired length.

Abstract: A remotely-operated chain saw apparatus useful for cutting overhead branches from ground level. A telescopic tube-shaft means extends between an engine at ground level and a gear box attached to a chain saw guide bar. A person standing on the ground can use the apparatus to cut off overhead branches without leaving the ground. The chain saw is adjustable so that the cutter chain can cut into the upper surface of a tree branch or into a side surface of the branch.

Abstract: A handle for a chain saw comprises a first U-shaped member and a second U-shaped member. The two members are connected to each other. The first member is connected to a bottom of a chain saw and the second member has a side bar that is connected to the body of the chain saw. The two members provided a handle that completely encircles the body of the chain saw to form a structurally rigid closed loop having multiple grasping positions which is relatively easy to assembly with the chain saw.

Abstract: A hay bale cutting chain with each pair of side links including a cutting link. The chain is without any protrusions other than the cutter portions, e.g. depth gauges and bumper portions are eliminated. The cutting edge, from a side view, is substantially vertical, and the side plate configuration is otherwise without a hook angle. The top plate is terminated short of the chain's mid-point to allow long strands that can get trapped under the top plates of the cutting links to escape. The chain is a small pitch chain, e.g. three-eights inch pitch, and drive at a rapid speed so that small bits are removed that more closely simulate sawdust than wood chips as in typical wood cutting.

Abstract: Vibration-isolating attachment means for a handle of a chain-saw wherein one end portion of a hollow vibration isolating rubber is fitted around the periphery of a recess formed on the main body of the chain-saw while the other end portion of said vibration isolating rubber is connected to the handle, and a stopper whose distal end is disposed within said recess is provided extending from the inner side of a cavity of said vibration isolating rubber toward the handle.

Abstract: On two opposite long narrow sides of a guide rail (1) of a chain saw for stone are arranged slide rails (3) of plastic. The slide rails (3) are located between the side walls (18, 19) of the guide rail. A link chain (2) consists of slide elements (6) and pairs of side guide members (7, 8) which are joined with each other through links (5). The slide elements (6) lie, on one side, on a surface (15) of the slide rail (3) and have, on the opposite side, cutting plates (4). In the slide rail (3) are arranged central coolant channels (13) which are connected with the coolant feed present in the core of the guide rail (1). The side guiding of the chain (2) is assured through the side guide members (7, 8) lying against the side surfaces (11, 12) of the slide rail (3).

Abstract: A chain saw having an outboard mounted centrifugal clutch adapted to drive an automatic lubricating pump. A cavity is formed in the portion of the housing from which the drive shaft protrudes. A worm gear for activating the lubrication pump is mounted in the cavity. A combination seal and worm gear drive member is slidably fit with the adapter of the clutch cup with a worm gear driver portion engaged with the worm gear. A disc shaped seal portion includes a lip that fits into a groove surrounding the cavity, held in place through engagement of the worm gear driver with the worm gear.

Abstract: A saw blade and saw-blade support are provided for a power-driven saw. The saw blade has planar cutting members and planar link members which are pivotally connected together. Each cutting member has a recess for receiving a portion of a link member. The saw-blade support is a blade support face, including a generally straight first section for bearing the cutting load, an arcuate second section merging with the straight first section and defining an end of the elongate member, and an arcuate third section merging with the arcuate second section, but having less curvature than the second section. The end of the saw-blade support carried by the power drive components has an outwardly-flared guide wall for leading said saw blade from the power drive onto the saw-blade support.

Abstract: An attachment for converting a conventional lawn trimmer for chain saw use has a ninety-degree adapter housing to removably mount a chain bar in axial alignment on the cutting head end of the trimmer frame. A bevel gear train connects the trimmer motor drive shaft to a sprocket for driving the chain, and an oil reservoir and thumb-operated pump mount to the frame to deliver lubrication to the chain during sawing.

Abstract: A sprocket assembly including a sprocket adapter driven by the motor of a chain saw. The adapter includes an adapter shaft which has a defined inner opening to fit around the drive shaft of the chain saw. A sprocket is mounted on the adapter shaft. Splines on the adapter shaft exterior fit into spline grooves of the sprocket. The thickness at the roots of the splines provide the strength to resist breakage. The exterior areas of the adapter shaft between the splines are flat landings which define relieved thickness areas between the splines and are aligned with tang-receiving pockets in the sprocket. The relieved areas permit an optimum sizing of the sprocket to the saw chain with sufficient pocket depth to fully receive the drive tangs of a saw chain. The sprocket rims are provided with mated inner edges that mate to the flat landings of the adapter shaft to facilitate transmission of the turning power from the drive shaft.

Abstract: The chain saw and guide assembly 10 includes two pairs of guide plates 14 and 15 mounted to the guide bar 12. The pairs of guide plates are spaced from each other and are used to engage guide surfaces (FIGS. 5, 6 and 8) as the center span of the saw chain 13 cuts a work product.

Abstract: There is disclosed a conversion chain saw in which a circular power hand saw which has been converted into a saddle-type chain saw is modified so that it is adapted to use a pin-and-groove-type chain saw and to be again converted back to a saddle-type chain saw. There is mounted on the drive shaft, a dual sprocket composed of a saddle-type chain-saw sprocket, which may be the one in the original conversion, and a pin-and-groove-type chain-saw sprocket. The two sockets are mounted on the shaft in juxtaposition. A shim-plate provides a secondary mounting base for the support bar for the pin-and-groove type. It has an oil tube and conduit for conducting oil into a complementary oil conduit in the new support bar. A suitable coupling nipple is provided to provide for continuity in the oil circuit which takes advantage of the oil circuit already provided in the original conversion.

Abstract: A hand-held power tool, for example a reciprocating saw, a chain saw, or a hedge trimmer, has a rear handle and a T-shaped forward handle formed by a forwardly directed strut with a crossbar. Looped side handles are detachably mounted on each side of the tool. Upper legs of the side handles are detachably connected to opposite ends of the forward handle crossbar. Lower legs of the side handles are detachably connected to bosses on opposite sides of the tool's housing adjacent its bottom. The side handles can be mounted with screws, or interlocking elements, or a combination of both. Preferably the forward handle is integrally formed with an upper part of the tool's housing. Both side handles may be omitted and the tool held by the forward and rear handles, this reducing the width of the tool.

Abstract: A chain saw is disclosed in which a cylinder of a plunger type oil pump is made of a tubular member, the cylinder body fitted at one end to a pump body and is closed at the other end by a plug member made of elastic material, and an oil flow path in communication with a chain guide groove of a guide bar of a saw chain is formed in the plug member.

Abstract: A chain saw bar defines an elongate open area within which is formed an insert member of a lightweight, nonmetallic material. An internal edge structure of the saw bar includes an inwardly directed, apertured flange. The insert member is formed with portions overlying opposite sides of the flange and at least partially occupies openings therein to enhance securement to the bar. An insert member of a fiber reinforced material is disclosed.

Abstract: This invention concerns an anti-jamming device for chain saws.Balls (4) alternating on either side of the side plates (2 and 3) are housed in holes 1a) provided in the central web, (1), bear into spherical cavities (2a or 3a) provided on the internal side of the side plates (2 or 3) and extend on the outside through holes provided in the other side plate (2 or 3).

Abstract: In connection with a conversion set for a portable circular saw, which latter comprises a housing, an associated electric drive motor with output shaft and, if necessary, also a gear, and at least one handle, it is proposed to attach to the basic unit remaining after removal of the circular saw blade a chain-saw adapter attachment, to convert the portable circular saw in this manner into an electric chain saw and to secure the chain-saw adapter attachment in place by means of mechanical stops provided on a main bearing plate and coacting with the gear housing of the circular saw and, in the axial direction, by tightening a screw upon the output shaft of the circular saw projecting through the drive pinion for the saw chain.

Abstract: An oil supply structure of a chain saw comprises a pair of rail portions which are provided on the outer circumference of the main body of a guide plate, a guide groove which is formed between the two rail portions, a pair of oil supply holes which penetrate the two rail portions from outside and which open toward the guide groove, a through hole which penetrates the main body of the guide plate without any connection with the guide groove, and a pair of connection channels which connect outer end openings of each oil supply hole and two outer end openings of the through hole. Lubricating oil is supplied from an outlet port of the main body of the chain saw to both sides of a saw chain and so forth through the through hole, connection channel and oil supply hole.

Abstract: The disclosure describes a support handle located in the plane of a motor-driven chain saw that also includes or is near the center of gravity of the saw so as to be a "support" handle for lifting and manipulating the chain saw. The support handle is reinforced with a profiled insert of a predetermined cross-sectional configuration to distribute vibrations and other internally generally forces so they are not magnified to deform the handle. The insert has a wedge-shaped end to fit within a bend of the support handle without bending the insert.

Abstract: A compact chain saw capable of cutting relatively hard materials and suitable for field work having a saw chain with cutting links each provided with a plurality of teeth having cutting edges thereon and driving notches provided on base portions of the cutting links to be held and pivotally supported by pairs of side links. The cutting edges are displaced in the lateral direction with the base portions of the cutting links in sliding contact with bottom portions (inner peripheral edges) of the guide grooves, and the pairs of side links riding on both side edges of the guide grooves, whereby the saw chain being rotatingly driven is restricted from pivot action and side-run phenomenon during cutting.

Abstract: The present invention comprises a chain saw safety device for use in preventing a broken saw chain from damaging the saw or injuring its operator. The device includes a rotatable roller and a mechanism for mounting the roller in alignment with the guide bar of the chain saw. The roller is aligned so as to intercept the saw chain should it become broken. The roller helps prevent the saw chain from pivoting back toward the operator and prevents the chain from gripping onto the saw and damaging it.

Abstract: The guide bar for a motor-driven chain saw is provided for taking highest loading and is therefore made of solid material. For weight reduction, openings are provided in the guide bar which are closed off by cover plates that are flush with the flat sides of the guide bar. The cover plates are firmly joined to the base plate of the guide bar. By means of the hollow spaces inside the guide bar, a considerable weight reduction is attained, yet the stability of the guide bar is not substantially impaired as compared to a solid guide bar, since the hollow spaces are located in the zone that is neutral in terms of bending.

Abstract: An air cleaner includes closure means comprised of a partition wall integrally formed on one side of a filter member, which closure means will selectively shut either a first air-intake port for sucking outside air into a filtration room or a second air-intake port to suck air into the filtration room through an engine room. One of these first and second air-intake ports is selectively closed by a partition wall by turning the positioning of the filter member.

Abstract: An articulated saw chain having pivotally interconnected center drive links and side links. The side links having bottom edges that incur splaying as a result of the side links pounding the guide bar rail during cutting action. An inset portion provided on the center links in the area of overlap defined by the bottom edge surface being pivoted relative to the center drive links. The insets thus providing added clearance to permit substantial splaying of the bar engaging bottom edge surface of the side links without interference and binding.

Abstract: A cobalt base alloy includes the alloy elements of nickel, chromium, tungsten, silicon and carbon with the nickel content being at least 25 percent by weight. The cobalt base alloy is applied as a coating material for guide bars of saw chains. The alloy has a high hardness with low brittleness by means of which an improved resistance to wear is achieved.

Abstract: An arrangement for decreasing the strain on a rivet joint of the top wheel in a motor saw. Lateral forces in consequence of unvoluntary jamming or twisting of the saw chain by its surrounding of the top of the sword cannot be totally avoided, which often gets the rivet joint (17) of the top wheel loose. In order to avoid such a thing it is suggested to provide a releasing slot (19) which separates the chain guiding portion of the outer sheets (10,11) of the saw sword from the riveted portion forming the inner roll bearing surface of the top wheel, which slot is extending through at least 180.degree. thereof.

Abstract: The effective reach of a chain saw is increased by drive transmitting extension structure which is interposed between the cutting head and motor and handle unit. A first gearbox is attached against a side of the motor and handle unit and contains a pair of orthogonally positioned engaged bevel gears one of which is driven by the drive output element of the motor. A drive shaft extends forward from the first gearbox within a tubular extension arm to a second gearbox to which the cutting head is secured and which transmits drive to the cutting chain drive sprocket. The extension maintains the center of mass close to the operator to minimize strain on the operator and is largely free of exposed moving parts and structural convolutions that could entangle foliage during tree trimming operations or the like.

Abstract: A brush is attachable to the top edge of a chain saw blade and is used to remove saw dust and clogged debris from a chain saw cut. Two brackets attached to the blade and the motor cover support an expandible bar that carries the bristles. An agitator is attached to the bristle carrying bar and includes a pair of rollers adapted to contact the moving chain. The brush is employed to clean the chain saw cut in order to keep the saw from binding or becoming gummed up with saw dust. The agitator may be selectively employed depending upon the difficulty of the cleaning task.

Abstract: A cutting device for a cutting machine comprises a chain guided in translation along a cutting plane by a chain guide and has cutting tools arranged alternately on either side of the cutting plane. Each cutting tool has a curved cutting end, which curves towards the outside of the cutting plane and defines a concave surface. A scraper is positioned on either side and in the vicinity of the chain guide and cutting tools parallel to the cutting plane, said scraper having two ends projecting towards said plane, each having a convex surface complementary to the concave surface, so that said ends remove cutting waste from the tools during the passage of the tools on the scraper. The cutting device is especially useful for cutting soft, sticking, or dirtying materials.

Abstract: The device is an air intake apparatus for a chain saw. There is a hollow main casing having front and rear ends. A handle extends above the casing. The handle is fixed to the casing. An engine is disposed in the casing. A carburator is disposed in the casing front adjacent to a fuel tank. An oil tank is disposed at the casing rear.

Abstract: A chain saw bar having an elongated shape, a saw chain guideway around substantially the length of the perimeter thereof, with a matching saw chain sprocket in the nose thereof, and calculated points of variation in strength in the interior of the bar at points removed from the sprocket, the points of variation in strength acting so that if the bar is subjected to an excessive bending force, the bar will tend to become bent initially at one point of variation in strength and with increased bending force at a subsequent point of variation in strength. In this way, extreme bending of the bar at one location and pinching of the sprocket are minimized.

Abstract: A device for braking the saw chain (3) of a portable power saw (1). The power saw has a front handle (5) to be gripped by one hand (6) of the saw operator, and a rear handle (7) to be gripped by the operator's other hand (8). The device includes a brake means (11) capable of braking the saw chain (3) by means of an actuating member (12). This may have the shape of an L-shaped tube (12) which is connected to a kickback guard (9)on the power saw, and which can be operated by the operator's rear hand as a result of a coercion wrenching movement of the rear hand (8) if any kickback of the power saw will occur.

Abstract: A base structure of a motor saw forms fuel and oil tanks (16,17) and a crankcase bottom in one piece. This piece is injection moulded in plastics with closed tank cavities obtained by means of cores in the mould which are made of a metal having a melting temperature lower than the softening temperature of the plastic material. After moulding the cores are melted by heat treatment and the metal runs out through filling holes (18,19) of the tanks. Armouring pieces are moulded in the plastics to reinforce the attachments of crankshaft bearings and the guide bar.

Abstract: A motor-driven chain saw essentially includes a housing having a rear handle and a front handle and a drive unit attached to the housing. A guide bar for accommodating the saw chain for movement thereon is attached to the drive unit. The housing has an extension arm on the underside of the chain saw which extends to the front; the drive unit is seated on this arm and the front handle is attached to the front end of the arm. To increase torsional and bending strength, the extension arm has an S-shaped profile when viewed in cross section. The S-shaped profile has a substantially rectangular configuration and includes lower, middle and upper parts that are parallel to one another and are interconnected by two flanks. The flanks are located in planes that are parallel to the guide bar.

Abstract: The motor-driven chain saw has a first handle at the back end for holding and operating the tool and a second handle mounted farther toward the front of the tool housing. The second handle is mounted so as to be spaced from and to surround the housing and is used for holding and guiding the tool. One end of the second handle is secured to the underside of the housing, and its other end is secured to the longitudinal housing side on which the guide bar for accommodating the moving saw chain is also mounted. The second handle is bent backward from the transverse plane on this side of the housing, approximately at the elevation of the guide bar, where it is secured to this longitudinal side of the housing nearer the back thereof. A strut extends downwardly and rearwardly from the top of the second handle and its free end is secured to the housing together with the end of the rearwardly-extending portion of the second handle.

Abstract: A guide bar for a chain saw includes three layers. The two outer layers are defined by side plates which can be welded together by means of inserts and the intermediate member located therebetween is held in a form-tight manner by means of the inserts that are welded to the side plates. Because of this configuration, the intermediate member may be made of plastic or aluminum thereby reducing the weight of the chain saw. The guide bar with this sandwich configuration has excellent strength and has a weight less than conventional guide bars of comparable size.

Abstract: A guide bar for a saw chain of a motor-driven chain saw has a guide groove formed in the periphery thereof. The drive links of the saw chain have projections known as rakers which protrude beyond the side links of the saw chain and which are guided in the guide groove. The guide bar has at least one supply bore in a groove wall through which lubricating oil is supplied for lubricating the saw chain. In the vicinity of the supply bore, a lubricant surface extending approximately parallel to the groove bottom is provided. This lubricant surface extends to at least one supply surface extending as far as the supply bore. The rakers of the drive links move above the lubricant surface with a narrow spacing. The lubricating oil supplied via the supply bore is guided via the supply surface to the lubricant surface where it forms a film into which the rakers extend as the saw chain revolves.

Abstract: A chain saw is provided with an oil pump for supplying oil to the saw chain. The pump includes a piston immersed in a chamber formed in the housing of the saw and rotatable by a gear rigidly connected to the piston and rotated by another gear driven by a motor. The gear connected to the piston has an inclined end face which wobbles upon the rotation of the gear and is pressed by a helical spring against a supporting ball which is positioned in a recess of a flange bolt manually turnable from the outside of the housing. The path of adjustment of the supporting ball is greater than the diameter of the piston. The working pressure generated by the spring is translated directly to the piston.