Abstract: A chainsaw (100) includes a power unit and a working assembly powered responsive to operation of the power unit. The working assembly includes a guide bar (120) around which a chain is rotatable. The guide bar (120) includes a first side plate (200) and a second side plate (210) facing each other and extending away from the housing (110) to a nose of the guide bar (120), the first and second side plates (200 and 210) each including an inner sidewall (224 and 222) facing inwardly toward each other. Each of the inner sidewalls (224 and 222) includes a recessed portion (230) at which material of the inner sidewalls (224 and 222) has been removed.

Abstract: A saw apparatus includes a guide bar, a chain driver, and an endless cutting chain trained about the guide bar and the chain driver. The guide bar includes a first chain retention feature along at least a portion of its periphery, and the cutting chain includes a second chain retention feature configured to interact with the first chain retention feature such that movement of the second chain retention feature away from the guide bar is restricted. A timber-working device includes a frame, at least one pair of arms pivotally attached to the frame and configured to be controlled to grasp at least one tree, and the saw apparatus mounted to the frame.

Abstract: A power tool system includes at least one power tool which has at least one workpiece support unit that is configured to support a workpiece during machining, and also includes at least one machining tool device which extends through a workpiece support surface of the workpiece support unit in at least one operating state. The machining tool device includes at least one cutting strand that is configured to be driven in circulation. A ratio of a maximum height of the workpiece support unit to a maximum cutting depth of the machining tool device is less than 4.1.

Abstract: A guide bar for a saw chain includes an elongate, flat base body made of a basic material. The base body extends along a longitudinal center axis and, in order to guide a saw chain, has a running surface formed on an outer periphery thereof and a guide groove formed in the outer periphery of the base body. The guide groove has a groove base. A direction-reversing section for the saw chain is provided at one end of the base body. The direction-reversing section includes at least one add-on component having a running surface made of more wear-resistant material than the basic material of the base body. The add-on component is secured to the base body of the guide bar by at least one weld seam. The weld seam extends between the add-on component and the base body and is located spatially beneath the groove base.

Abstract: The invention relates to a plowing device having a plow chain which is guided inside a channel (2) having an inner radius (A1) and the chain links of which each have chain bends (5) and chain limbs (6) connecting the latter. In cross section, the chain limbs (6) each have an outside radius that extends along a chord length, wherein the inner radius (A1) of the channel (2) and the outer radius of the chain limbs (6) have a ratio of 1:0.8 to 1:1.2 in relation to one another.

Abstract: A chain link (1) of steel has two spaced-apart transverse apertures (2) to receive portions of leading and trailing pivot pins (4) and, on an upper surface, a seat (6, 7) to receive a welded-in pick box (8), the link (1), at one side at least, being provided with at least one pad (14) of a material of higher wear resistance than the steel of the link (1). The invention also includes a steel pivot pin (4) for use in connecting together, in an articulated manner, steel links (1) of mineral cutter/removal chain, at least one end of the pin (4) being provided with a wear pad (16). The invention also includes a mineral cutting/removal chain for use with an inclined jib, constructed from an odd number of links (1) articulated on pins (4).

Abstract: A method of applying frictional braking to motion of a cutter providing chain thereof, involving the entering of an insertional element into the chain channel guide.

Abstract: The invention relates to a cutting tooth for a ground working implement, particularly for a cutting wheel of a trench wall cutter, with a dedendum for reception in a holder of the ground working implement and at least one main cutting element for working the soil located at the top on the dedendum. For widening the working cross-section of the main cutting element at least one further reaming element is provided at the top on the dedendum and which, compared with the main cutting element, has a different cutting edge design.

Abstract: In one aspect of the invention, a degradation assembly comprises a holder. The holder is attached to a driving mechanism and comprises a longitudinal central bore. A pick comprises a body intermediate a shank and an impact tip, and the shank is disposed in the central bore of the holder. The impact tip comprises an impact surface diamond or cubic boron nitride. At least one rolling element is disposed intermediate an inner bore surface and the shank, and is adapted for low-friction rotation with respect to both the inner bore surface and the shank.

Abstract: A cutting tooth used on an endless chain-trenching machine to fracture and excavate the ground. The tooth includes a mounting portion for attachment to the chain and a cutting portion having a straight cutting edge at the leading end of the tooth positioned normal to the direction movement of the chain. The cutting portion is aligned from the mounting at an acute angle to the plane of the mounting portion and including convex surfaces on both sides of the cutting portion and a juncture line between the mounting portion and the cutting portion forms an acute angle with the direction movement of the chain whereby the cuttings produced by the tooth are lifted away by the chain as the chain is digging.

Abstract: The present disclosure relates to a cutting tooth for a trencher chain. The tooth includes a base portion aligned along a first plane. The base portion includes structure for allowing the cutting tooth to be connected to the trencher chain. The tooth also includes a distal portion that is generally obliquely aligned with respect to the first plane. A curved transition is located between the distal portion and the base portion. The curved transition curves away from the first plane and at least partially forms a cupped portion that extends from a leading end to a trailing end of the cutting tooth. The tooth also includes a hardened tip positioned at a region of the leading end that is located farthest from the first plane. The leading edge includes more than one effective configuration.

Abstract: According to the present invention a bit holder block that can be durably connected to both a driven chain and rotary drum is disclosed. The bit holder block is designed to enable it to be welded or fused by other well-known methods to either a rotary drum or driven chain. The invention includes a bottom surface for welding to either a drum or chain. The bottom surface includes a central arcuate surface and flanking flat surfaces at opposite ends of the central arcuate surface. On the flat plate of driven chain cutting machinery the flanking flat surfaces sit squarely on the flat plate. When welded to a drum the base's bottom surface makes two lines of contact with the drum limiting the likelihood of undesirable.

Abstract: A cutting tooth is fitted in a cutting-tooth holder of an earthworking appliance which has at least one cutter. The cutter is mounted ahead of a cutter-support region, as seen in the cutting direction, and has at least one cutting edge. The size of the cross-sectional areas of the cutter-support region which lie perpendicular to the cutting advance direction and intersect the cutting edge remains approximately constant in the area which is delimited by in each case two such cross-sectional areas.