Abstract: The present disclosure provides chain guards for chain saws attached to the end of a long reach pole. The chain guards include a chip deflector and a deflector cover that deflects and channels wood chips away from an operator. The chip deflector includes one or more curved surfaces configured to deflect the wood chips out of the chain guard and away for the operator while minimizing binding of the wood chips with the chain.

Abstract: A chainsaw (100) includes a power unit, a bar (120), a chain (122) operably coupled to the bar (120) to rotate around the bar (120) responsive to drive power from the power unit, an oil pump operably coupled to the power unit to deliver oil to the chain (122), and an oil 420 reservoir (400) configured to hold oil for delivery to the chain (122) via the oil pump. The oil reservoir (400) may include a main chamber (410) to receive the oil and an air chamber (420). The air chamber (420) may be formed adjacent to and distinct from the main chamber (410). The air chamber (420) is configured to define a space for an air pocket.

Abstract: A guide bar for a chain saw comprising two opposite elongate surfaces and a slot formed between said opposite sides running along the periphery of the guide bar, in order to receive and retain the chain during cutting. At least one of the elongate surfaces is furrowed across its surface in the direction of the cutting movement of the guide bar. The invention also relates to an apparatus for operating the chain saw in a forestry machine.

Abstract: A battery-powered chain saw is provided which chain saw comprises a housing (10) extending in a longitudinal direction (X) between a front end (12) and a rear end (11), a rear handle (20) fixedly connected to or integral with the housing (10) and extending in the longitudinal direction (X), a front handle (30) fixedly connected to the housing (10) and an electric motor (40) arranged to drive a cutting element of the chain saw, the electric motor having a motor rotation axis (A1). The chain saw has a longitudinal rotation axis (X1). It is characterized in that a point (60) in which a center axis (A2) of an upper portion (31) of the front handle (30) intersects a vertical plane (P) comprising the longitudinal rotation axis (X1) of the chain saw, is positioned rearwardly of a point (70) in which the motor rotation axis (A1) intersects said vertical plane (P).

Abstract: This invention relates to a nose assembly for a chainsaw guide bar for wood harvesting and a chainsaw guide bar having the same. The nose assembly (400) comprising: a pair of nose side plates (410, 420; 470); and a sprocket and bearing assembly adapted to be clamped between the pair of nose side plates (410, 420; 470) and comprising an idler sprocket (450); wherein at least one of the pair of the nose side plates (410, 420; 470) is provided at an inside surface thereof facing to the sprocket and bearing assembly with one or more lubricant conveying channels for lubricating the sprocket and bearing assembly. The chainsaw guide bars according to the present invention enable flow of lubricant to moving parts in order to reduce friction of these moving parts as a saw chain rotates though the guide bar.

Abstract: A power tool has a sprocket wheel cover mounted on a housing and a guide bar secured between housing and sprocket wheel cover and having a guide groove for a saw chain. The guide bar has a guide slot extending in a longitudinal direction of the guide bar and guiding the guide bar on a guide element for longitudinal movement relative to the housing. The guide bar has a first exterior side extending in a first plane and facing the housing and a second exterior side extending in a second plane and facing the sprocket wheel cover. The guide bar has an oil supply opening extending from the second exterior side into the guide groove and connected by an oil supply channel with an oil supply device. The oil supply channel has a channel section separate from the guide bar and extending from the first to the second plane.

Abstract: An engine-driven brush cutter (100) equipped with a safety device (42) that includes an acceleration sensor unit (24) attached to a drive unit (4) in an aslant orientation such that a detection axis (DA) of the sensor unit (24) inclines by an angle (?1) relative to the right-and-left direction (R-L) of the brush cutter (100). This inclined orientation of the detection axis (DA) contributes to lowering the sensitivity of the sensor unit (24) to impulses in the direction parallel to a moving direction of a cutting blade (40) operated by an operator at work.

Abstract: An engine-driven brush cutter (100) equipped with a safety device (42) that includes an acceleration sensor unit (24) attached to a drive unit (4) in an aslant orientation such that a detection axis (DA) of the sensor unit (24) inclines by an angle (?1) relative to the up-and-down direction (V) of the brush cutter (100). This inclined orientation of the detection axis (DA) contributes to lowering the sensitivity of the sensor unit (24) to engine vibration to which the safety device should not be sensitive so much.

Abstract: The present invention includes an open-top sheath case for receiving a chainsaw blade and a planar sheath cover detachably secured to the sheath case to cover the open-top of the sheath case. The sheath cover includes an inwardly extending “L” shaped lip along the longitudinal edges of the sheath cover. An open-top tool kit box includes a floor, a pair of side walls and a front and rear end walls extending upwardly from the floor. The tool kit box further includes an outwardly extending lip provided on the upper edges of the sidewalls and the front end wall. The outwardly extending lip of the tool box kit is sized to be slidably received by the inwardly extending lip of the sheath cover.

Abstract: A motor chain saw has a first driven sprocket wheel driving a saw chain lubricated via a supply pump driven by first and second drive wheel, wherein the second drive wheel is connected to the first sprocket wheel. A drive element with coupling section is connected to the first sprocket wheel and the second drive wheel is formed on the drive element. A second sprocket wheel can be used in place of the first sprocket wheel. The first and second sprocket wheels have different geometries. The coupling section has first and second followers correlated with follower surfaces of the first and second sprocket wheels. The coupling section contacts with first followers the follower surfaces of the first sprocket wheel or with second followers the follower surfaces of the second sprocket wheel when used in place of the first sprocket wheel.

Abstract: A positioning system for attachment to a vehicle for operation of a power tool by a ground-based operator sitting in the vehicle provides a telescoping mast attached to the vehicle, a pivot bracket connecting an upper arm to the upper portion of the telescoping mast, mounting means for mounting the power tool on the upper arm; and power means for operating the power tool from the operator's position in the vehicle.

Abstract: The system includes a grease pump assembly connected to a conduit having a grease outlet adjacent an endless chain of the chainsaw. The method includes pushing the grease toward the grease pump, pumping the grease, and feeding the grease between the endless chain and the guide bar. The pumping of the grease can be done automatically upon detecting an activation of the chain saw.

Abstract: A cutting assembly of a chainsaw includes a saw chain and a guide bar (4) for guiding the saw chain (3) along a peripheral edge (5) of the guide bar. The saw chain (3) has drive links (6) having drive bases (7) which with their side surfaces (8, 8?) are slidingly guided between the side walls (9) of a guide groove (10) of the guide bar (4) with the formation of a friction pairing. Lubricant pockets (11) are formed in the side surface (8). The lubricant pockets (11) are only open toward the corresponding side wall (9) of the guide groove (10) and are otherwise closed. Offside the lubricant pockets (11), the side surface (8) has a flat sliding surface (12) which slides on the side wall (9) of the guide groove (10). The lubricant pocket (11) has a mean diameter and a maximum depth. The ratio of the mean diameter to the maximum depth lies in a range of 5.0 up to and including 25.0.

Abstract: Chain saw featuring an endless cutting chain (5), mounted turning around a drive sprocket and a guide bar (6) equipped with a guide rail, a motor (8) driving this cutting chain, through the intermediary of said sprocket, a storage tank (11) of a lubricating fluid, as well as a pump (13) impelling the lubricating fluid towards the guide bar/cutting chain assembly (5-6), from the storage tank (10), characterized in that said pump (13) is coupled to an electric drive motor (13a) which is independent of the motor (8) driving the cutting chain (5).

Abstract: Disclosed herein is an apparatus preferably coupled to a boom on a truck which can simultaneously trim and chemically treat trees or other vegetation with a herbicide. The apparatus, in addition to have a standard saw blade assembly with limb clamping jaws, includes a sprayer assembly. The sprayer assembly includes nozzles which administer herbicides or other chemical treatments adjacent to the saw blades, allowing herbicide to be precisely administered to the tree limbs as they are cut.

Abstract: A guide bar for a chain saw of a tree harvester adapted for applying treatment material to the stump upon severing a tree. The guide bar, typically a laminated bar includes an inner channel in the inner laminate that connects to a series of dispersal holes in the outer laminates and along the bar length. Multiple inlet holes also in the outer laminate or laminates are provided in a rear region of the bar for directing material flow into the channel. Only one of the inlet holes is in use and the other inlet holes are plugged. The invention provides for plugging unused inlet holes with a member (plug) that slides into position over the unused inlet holes at the inner side of the outer laminate. Numerous variations are proposed including both automatic, where treatment material flow generates an inner pressure that urges a member against the inner side of the unused hole and manual, where a blocking tab is manually slid into place at the inner side of the hole.

Abstract: The invention relates to an operating substance tank (1) which is especially for a portable handheld work apparatus (2). The tank (1) has a fill opening (3) and a suction connection (4). The tank is configured from a first housing part (6) and a second housing part (7) connected to the first housing part (6). In this way, the tank is built up in a simple manner and is operationally reliable. A valve (8) is formed in the interior of the tank (1) so that a valve member (9) is held by the first housing part (6) and the valve member (9) comes into seal-tight contact on an opening (10) of a through bore (11) on the second housing part (7). The valve (8) functions especially as an aerating valve for the tank (1).

Abstract: A guide bar having fluid conveying channels at the opposed sides. The channel on one side provided by the manufacturer with holes or orifices for dispensing treatment fluid from the channels onto a stump being sawn. The other side provided with markings to guide the operator in making holes or orifices at the time the bar is to be inverted. The markings may be dimples to provide centering of a piercing tool. They may also be provided at the sides of the channel and different marking sets will provide for different sizes of trees being cut.

Abstract: A chain medium pump (20) for a motor chain saw (10) is made disconnectable in a simple manner, the chain medium pump (20) sucking the chain medium over a suction pipe (29) from a tank (22) and delivering it over a pressure pipe (27) to a sawing device (12) of the motor chain saw (10), by the fact that, for disconnecting the supply of the sawing device (12) with the chain medium, there exist controllable means (23-26) with which the pressure pipe (27) is interrupted, the chain medium pump (20) being running, and simultaneously the chain medium delivered by the chain medium pump (20) can be returned into the suction pipe (29).

Abstract: A sawing device and a chain for it, comprising at least two adjacent sequences of connecting links, of which at least some are cutting teeth; and a sequence of drive links fitted between two adjacent connecting link sequences, wherein an opening at the rear end of the drive link is centered at an opening in the front end of the connecting links, wherein an opening in the front end of the drive link is centered at an opening of the rear end of the connecting links, and wherein a binding pin extending through the whole width of the chain is fitted in the openings. To increase the sawing width, a bush ring is fitted between two adjacent connecting link sequences, around the pin, and placed in the opening of the drive link, and on at least one side of said drive link, a collar is fitted whose diameter is formed greater than the opening in said drive link.

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 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: A guide bar for the treatment of tree stumps. A channel formed in the bar length is fitted with a soft metal tube. The tube is pierced with a piercing tool that produces hole forms leaving a center opening inset toward the tube center with flared sides that allow spreading of the liquid treatment directed from the tube interior to a stump surface while severing a tree. The opening may be varied in size to accommodate different pivotal speed rates of the hole form locations along the bar length.

Abstract: In the operation of wood cutting machines such as delimbing machines which use chain saw cutting devices, it is common to either position the lubricating oil reservoir above the chain saw cutting device to create a gravity-fed system or couple a pump apparatus to the chain saw cutting device. Both arrangements may limit the flexibility of placement of the components comprising the lubrication system. The present invention provides a lubrication system for a wood cutting machine in which a receptacle receives lubricating fluid from the reservoir by use of a source of supply pressure within the receptacle. A source of discharge pressure operates on the receptacle to transport the lubrication fluid to the cutting chain device.

Abstract: A chain saw for cutting branches of up to 200 mm in diameter and above, including a main body, a self-priming pump, a joint, a positioning washer, a collar bracket, an oil sump, hook supports and a blade. It falls within the technical field of human requirements and within the application field of instrument and tool manufacturing. It will cut branches within arm's reach and if a telescopic extension is fitted it will cut branches at any desired height. It is easily operated and as a result of the ease with which the parts may be replaced it is easily maintained and therefore very reliable.

Abstract: The invention relates to an operating substance tank (1), especially for a portable handheld work apparatus (2) having a fill opening (3) and an outflow opening (4). The operating substance tank (1) is configured from a first housing part (6) and a second housing part (7) connected to the first housing part in order to configure the operating substance tank (1) in a simple assembly so that the operating substance can be made available without disruption. A filter wall (8) is configured as one piece from a housing part (6) and partitions the tank housing (5) of the operating substance tank (1) into at least two spaces (9, 10).

Abstract: The invention relates to an operating substance tank (1) which is especially for a portable handheld work apparatus (2). The tank (1) has a fill opening (3) and a suction connection (4). The tank is configured from a first housing part (6) and a second housing part (7) connected to the first housing part (6). In this way, the tank is built up in a simple manner and is operationally reliable. A valve (8) is formed in the interior of the tank (1) so that a valve member (9) is held by the first housing part (6) and the valve member (9) comes into seal-tight contact on an opening (10) of a through bore (11) on the second housing part (7). The valve (8) functions especially as an aerating valve for the tank (1).

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 saw assembly for a grip-harvester comprises a saw chain running around a bar, a pivotably journalled bar holder, and a liquid supply device having at least one nozzle for supplying at least one functional marking liquid to a cut surface produced during a sawing operation. The nozzle is mounted inside the saw box of the saw assembly and is fixed at a predetermined distance from a tree, measured at the saw cut to be executed. The nozzle is so directed that a liquid jet encounters the bar at an acute angle &agr;(e.g. &agr;=20-40°) and is deflected in towards the cut surface via a space between the bar and the cut surface. A control device initiates the supply of a liquid jet when the bar has been inserted a predetermined distance into the tree.