Abstract: A short bar sprocket and pump assembly as well as short bar sprocket and pump and chainsaw motor assemblies are provided. A short bar assembly having a cooling assembly attached thereto is provided. A chainsaw chain drive assembly having a cooling assembly for the chain drive is provided.

Abstract: The present disclosure relates to an arrangement for transferring fluid to a guide bar in a chain saw. A channel can extend from a chain saw body to the fastening arrangement of the guide bar. The channel can include a cavity through the entire channel, a first end of the cavity being connected to a feed channel provided in the chain saw body and a second end thereof to a counter channel provided in the fastening arrangement. The counter channel, in turn, is arranged to extend to the guide bar. The channel is thus arranged to guide fluid flowing in the feed channel provided in the chain saw body through the channel and further through the counter channel provided in the fastening arrangement to the guide bar.

Abstract: The present invention relates to a novel design for a lightweight, portable D shaped circular dog run that is adapted for quick and simple attachment to a plethora of different diameter vertical stanchions including but not limited to posts, trees, pillars, poles and the like. It has a simple configuration wherein its distal end is insert able within its proximal end to an adjustable depth and then pinned therein, so as to create a continuous ring with a central void that accepts a spherical end of a track sphere. The track sphere rotates around the D shaped run within its central void and having a linear member extending normally therefrom with a lead ring on its end that the leash of the pet can be affixed to.

Abstract: A self adjusting chain mechanism for use with an undercutter attached to an excavator having hydraulic means for adjusting the undercutter; the self adjusting mechanism has a chain and sprocket assembly in a sprocket holding frame, a ram and piston, all operating in conjunction with the hydraulics of the excavator with a control system to move an adjuster shaft connected to the chain sprocket assembly, so as to cause the chain to tighten in response to the changes in hydraulic pressure.

Abstract: The disclosure relates to a portable machine tool, in particular a hand-held machine tool, comprising at least one coupling device which is designed to be coupled to a machine tool separation device having at least one cutting unit and at least one guide unit for guiding the cutting unit. According to the disclosure, the portable machine tool comprises at least one machine tool stabilizing device which comprises, in an area outside the coupling device, at least one stabilizing element having at least one support surface for stabilizing the machine tool separation device.

Abstract: A guide bar for a chain saw includes a first guide plate, a second guide plate and a spacer plate which is sandwiched between the first and second guide plates. Each of the first and second guide plates has a plurality of protrusions extending from an outer side thereof and recesses defined in an inner side thereof. A groove is defined along an outer periphery of the spacer plate and located between the first and second guide plates so as to receive the chain. The protrusions and recesses reinforce the structural strength of the guide bar and reduce the friction between the guide bar and the object to be cut.

Abstract: A guide bar arrangement has a guide bar having a guide groove that extends about an outer circumference of the guide bar. A saw chain is driven in circulation in the guide groove about the guide bar. The guide groove is delimited by a groove base, a first sidewall and a second sidewall positioned opposite the first sidewall. The guide bar has an opening for supply of oil into the guide groove, wherein the opening extends from an exterior side of the guide bar, wherein the exterior side extends in a longitudinal direction of the guide bar, into the guide groove and opens in the first sidewall into the guide groove. An insert is secured in the opening and reduces a free flow cross-sectional area of the opening.

Abstract: A chainsaw is provided having a brake band disposed about a drum that rotates during advancement of the saw chain about the saw bar. An end of the brake band is biased to a position that draws the brake band tight about the drum to prevent advancement of the saw chain, and the throttle trigger of the chainsaw is associated with this biased end to push the band against the bias and release the drum when the throttle trigger is squeezed to drive the elements of the chainsaw that serve to advance the saw chain. Also provided are new concepts for associating throttling and braking elements with the throttle trigger.

Abstract: A chain saw bar tensioning apparatus is disclosed comprising a sliding member having a recess formed therein. The sliding member is adjacent to a first tensioning member that biases the sliding member in a direction such that when the apparatus is incorporated into a chain saw bar and mounted to a chain saw having a mounting stud, the sliding member is biased towards the mounting stud. The apparatus further comprises a latch adjacent to a second tensioning member. The recess of the sliding member is configured to receive the latch and the second tensioning member biases the latch towards the sliding member such that, when the sliding member is forced in a direction away from the mounting stud, the latch will eventually enter the recess and prevent the sliding member from moving towards the mounting stud.

Abstract: In a chain saw having a sprocket (11), which is supported in rotary fashion in a housing (10) and is for a saw chain (12) guided on a guide (13), and having a chain tension device (14) for longitudinally moving the blade (13), which device has a cam (15) that moves the guide (13) and a rotating member (17) for rotating the cam (15), in order to preset a chain tension that is optimal for operation and is independent of the user, the rotary connection between the rotating member (17) and cam (15) is embodied as a detent overload clutch (18), whose detent overload force is set in accordance with the required chain tension (FIG. 2).

Abstract: A mechanism for tensioning the chain of a chain saw. The apparatus includes a cutting bar around which the chain extends. The cutting bar has a base portion mounted to an operating housing of the chain saw, and a distal portion carried by the base portion at an end thereof remote from the housing. The distal portion of the cutting bar is disposed for sliding extension relative to the base portion of the cutting bar. The distal portion of the cutting bar mounts a sprocket, around which the chain passes, at an outer end thereof. The sprocket is disposed for rotation about an axis. Structure is included to effect extension of the distal portion of the cutting bar relative to the base portion thereof. Tensioning of the chain saw is, thereby, accomplished.

Abstract: A tree felling apparatus has a U-shaped base with a pair of laterally spaced arms defining a cutting area for receiving therein a tree to be cut and a chain saw mechanism movable through the cutting area for cutting a tree. The chain saw mechanism includes a saw bar which is tapered inwardly from its proximal end to its distal end for even distribution of bending stress across the saw bar.

Abstract: When moving the guide bar on a chain saw in order to adjust the chain tension, the following procedure is applied. Through the guide bar runs a shaft (19) having a slot for a screw driver as well as a shape of a cog-wheel (18) on the inside of the guide bar. The hole in the guide bar is the ordinary hole for a tension pin. The cover (11) above the clutch also keeps the guide bar in place and has an oval opening (23) providing accessibility to the above shaft in all its positions. Inside the guide bar, in the saw body, there is a suitable oblong cavity (16) to make room for the cog-wheel part of the shaft. That cavity has on its lower edge the form of a straight toothed section (17) adapted to the cog-wheel part.

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: 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 saw carrier assembly has a loop of saw chain and a powered sprocket to drive the saw chain. The assembly also has a saw chain journalling structure having a rotatable circular periphery cooperating with the saw chain to mount the chain to rotate therewith to reduce friction and to resist sawing forces. The saw journalling structure and sprocket cooperate with a saw support structure so that the chain saw extends as a loop around the sprocket and journalling structure. The journalling structure has a thickness less than the kerf produced by the saw to permit a portion of the saw journalling structure to pass into the kerf with negligible interference therewith. This enables a tree to be cut using a saw journalling structure of slightly less diameter than diameter of the tree where it is cut, and reduces frictional losses normally associated with a fixed chain saw support bar.

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 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.