Abstract: A guide bar for a chain saw, the bar having oppositely located flat sides. A plurality of recesses are formed in each of the sides, the recesses on one side being offset from the recesses on the other side. At least some of the recesses are filled with a lightweight material. Some of the recesses may also function as oil reservoirs and oil passages between the guide grooves of the bar.

Abstract: A guide bar for chain saw comprises a main body of a plate shape. The main body has first and second sides facing each other in the thickness direction of the main body. The main body includes at least a first recess provided on the first side, and a second recess provided on the second side of the main body. The first recess has a first portion communicated with the second recess so that the recesses define in combination a through hole at the communciating portion, and a second portion shielded by the second side of the main body. A filler is packed in said first and second recesses.

Abstract: A chain saw guide bar including an inner plate and a pair of outer plates fixed to both flat sides of the inner plate. The inner plate has holes formed therethrough. The outer plates also have holes formed therethrough, but they are smaller than the holes of the inner plate. The outer holes are each aligned with one of the inner holes, and the holes are filled with a lightweight material.

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 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: The invention is directed to a guide bar for the saw chain of a motor-driven chain saw and includes a base body section on which a nose assembly section for the saw chain is releasably attached. The nose assembly section is attached to the base body section by means of a releasable lock which is not destroyed in order to effect a separation of the two sections. The lock includes an eccentric cam which is rotatable about an axis transverse to the plane of the guide bar. The cam is in contact engagement with a wall of a bore in the guide bar when the cam is in the locked position.

Abstract: A guide bar for a chain saw with closed oil channels, arranged to lubricate the inside of the chain just before it starts sliding against the underside of the guidebar, as well as the supporting teeth of the nose sprocket just before the intermesh with the chain.

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: A guide bar for a motor-driven chain saw is disclosed wherein the guide bar is provided with a center cutout extending in the longitudinal direction of the bar which is filled out with a bonded fiber material made of plastic and reinforced with long fibers. The guide bar reduces the weight and facilitates manipulation of the chain saw equipped therewith while at the same time providing a high strength and the capacity to take up bending and torsion loads.

Abstract: A laminated guide bar is provided with a center or core laminate comprised of an adhesive-foam material that is configured to form the guide groove. The adhesive-foam core resists deformation, strongly adheres to the interfacing outer laminate sides, and is inert and impervious to oil. The core is formed in place between the outer laminates with a fixture surrounding the outer laminates and maintaining their spaced relationship. A cavity is provided in the fixture that conforms to the desired core configuration. The foam material has a controlled activation to allow assembly of the fixture and upon activation, produces the desired properties mentioned. It is desirable to roughen the inner sides of the outer steel laminates to assist the bonding action of the foam material.

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: A nose roller tip for a cutter bar of a chain saw. There is a mounting web to engage the cutter bar. A pair of rollers are each mounted on opposed sides of the mounting web. There are outer plates, one adjacent each roller. The mounting web, rollers and outer plates are attached together to allow free rotation of the roller relative to the nose roller tip.

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: 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 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: An elongate chain support blade of a chain saw is shaped so as to provide clearance between respective runs of the chain and longitudinal edges of the blade, thereby reducing friction and reducing oil usage. Other aspects of the invention reside in a chain guide wheel on the blade providing the chain with a short inclined chain run at the forward end, and different forms of chain-tensioning devices.

Abstract: A chain saw guide bar comprises a guide bar body and a nose assembly coupled to an end of the guide bar body, the guide bar body having a longitudinal tongue projecting centrally from an end thereof and thinner core plates extending laterally from opposite sides of the tongue, the nose assembly being composed of a pair of side plates having recesses defined centrally in tail ends thereof and receiving the tongue fitted therein, the body and the nose assembly being coupled together by rivets inserted through the side plates and the core plates with the core plates inserted between the side plates. The core plates may or may not project beyond a distal end of the tongue. The end of the guide bar body and the tail end of the nose assembly are held in abutment at a position spaced 90 mm or preferably more from a tip end of the nose assembly so that the guide bar body will not be adversely affected by hitting engagement with a saw chain.

Abstract: This disclosure relates to a guide bar for a saw chain which includes a pair of side plates and a center plate laser welded to and between the side plates. The center plate has a peripheral edge which is spaced inwardly from the outer periphery of the side plates so as to form a peripheral guide channel or groove for the chain. The disclosure further relates to a method of making a three-plate guide bar wherein the plates are laser welded together.

Abstract: A guide bar extension member coupled to a guide bar of a chain saw for selectively lengthening or shortening the cutting bar for cutting different size pieces of timber, for example. In its preferred form, the guide bar comprises a sectional guide bar assembly which is separable at the high point of its curved periphery into rear and forward guide bar portions with an extension element of a predetermined length inserted therebetween.

Abstract: A guide bar has a main body section and a separate nose section releasably secured thereto. The main body section has a pair of opposed recesses in opposite faces thereof and an opening in said recesses to form a flange. The nose section includes a pair of opposed plates, at least one of the plates having a central portion deformed laterally toward the other plate. The plates are secured together in the region of lateral deformation with edge margins thereof spaced apart to provide a drive chain-receiving groove generally aligned with a similar groove in the peripheral edge of the main body section. The body and nose sections are secured together by a hub and expander member assembly which extends into substantially aligned apertures in the body section and nose section. Edge margins of the recesses on the body section and nose section are disposed at diverging angles progressing toward the nose end of the bar to aid in alignment and securing of the body and nose section.

Abstract: A chain saw bar having a central groove along the top and bottom edges to guide the chain about the bar, and a bar nose structure at the end of the bar to guide the chain from the top edge to the bottom edge. The nose structure including an extension of the bar on one side of the groove and a roller rotatably mounted on the extension to form the other side of the groove at the nose of the bar. The roller and extension having arcuate peripheral faces to guide the chain about the nose of the bar.

Abstract: This disclosure relates to a chain saw guide bar including a main or body part and a front part. The two parts fit together in a tongue-and-groove joint having a V configuration, and the parts are secured together by fasteners such as rivets. A chain guide groove is formed in the periphery of the two parts, and the front part may include a rotatable sprocket for the chain.

Abstract: A chain saw guide bar assembly (30) having improved automatic chain tensioning, vibration damping and lubrication properties, and related lubrication methods are disclosed. A nose guide member (34) rotatably carrying an idler sprocket (34.1) is mounted to an elongate primary guide bar member (32) for reciprocal longitudinal movement relative thereto. Biasing spring members (50, 51), acting on force-imparting surfaces (60.4, 60.5), are protectively enclosed within an internal cavity (33) of the primary guide member and bias the nose guide member with predetermined tensioning force in the longitudinal direction against an endless cutting chain (40). An interchangeable force block member (60) enables preselection of the desired chain tension force. Damping finger members (32.35, 32.36, 50, 51) cooperatively absorb vibratory forces transmitted through the guide bar. Oil passageways (32.33, 32.

Abstract: A chain saw safety improvement is disclosed. Enclosed in a hollow guide bar is a link positioning device which moves the links on the chain into a cutting or safety position. This device is spring tensioned and normally in the safety position. The chain links themselves are pivotable and scythe-shaped, the tips acting as safety tails. When the link positioning device is in its normal safety position, it pushes the safety tails, moving the links into a noncutting position. When tension is manually released by the operator, the links may move into their cutting position.

Abstract: This invention relates to a saw guide bar comprising two side plates and an intermediate layer. Each side plate comprises a layer of reinforced plastic material and a layer of metal.

Abstract: A saw guide bar comprising a main part and a nose part detachably fastened to the main part, the joints between the nose part and the main part being displaced relative to each other in the direction of chain travel.

Abstract: A chain saw guide bar assembly (30) having improved automatic chain tensioning, vibration damping and lubrication properties, and related lubrication methods are provided. A nose guide member (34) rotatably carrying an idler sprocket (34.1) is mounted to an elongate primary guide bar member (32) for reciprocal longitudinal movement relative thereto. Biasing spring members (50, 51) acting on force-imparting surfaces (60.4, 60.5), are protectively enclosed within an internal cavity (33) of the primary guide member and bias the nose guide member with predetermined tensioning force in the longitudinal direction against an endless cutting chain (40). An interchangeable force block member (60) enables preselection of the desired chain tension force. Damping finger members (32.35, 32.36, 50, 51) cooperatively absorb vibratory forces transmitted through the guide bar. Oil passageways (32.33, 32.

Abstract: Chain saw bars having overlapping slots adjacent locations where the saw chain leaves the driving sprocket and in the region of the nose end of the bar are provided. In these areas, where the chain tends to pound against the bar, the slots dampen the vibrations between the outer portions of the bar rails and the interior of the bar and greatly reduce noise emission. The slots also provide cooling of the saw bar.

Abstract: This invention relates to a nose shoe for a mechanically driven cutter chain. The cylindrical nose shoe is capable of being indexed about a central pivot point so as to reposition the outermost surface to compensate for wear. The nose shoe is rotatable in distinct segments, and is locked during operation by means of bolts extending through the cutter assembly in the nose shoe.

Abstract: A guide bar for a chain saw including a pair of plates of a small thickness each formed, on its surface, by means of a press, with a groove extending in its marginal portion substantially parallel to its edge. The pair of plates are positioned back to back at the bulging bottoms of the grooves and bonded together to provide, in a peripheral portion of the guide bar, a chain guide groove defined by the marginal portions of the two plates of a small thickness.

Abstract: A chain saw guide bar is formed of two metal plates of uniform thickness and of like size and shape. Each of the plates has local areas displaced from the plane of the plate to form protuberances on the inner face of the plate and corresponding recesses in the outer face. The protuberances are spaced from one another both laterally and longitudinally of the plate and comprise rows of protuberances which are spaced inwardly from opposite side edges of the plates a distance slightly greater than the length of the tangs of a saw chain to be used on the guide bar. The two plates are superposed on one another with the protuberances of one plate engaging matching protuberances of the other plate. One of the protuberances of each pair of matching protuberances has an integral tubular projection extending through a hole in the matching protuberance and riveted over in the corresponding recess to unite the plates in a unitary structure.