996 results about "Chain saw" patented technology

The invention relates to a portable handheld work apparatus including a chain saw, a vacuum/blower apparatus or the like. The work apparatus has a handle (2) for carrying and guiding the work apparatus (1). Thumb supports (4, 5) are provided on both sides with respect to the longitudinal axis (3) of the handle (2).

The invention discloses an automatic lumbering and pruning robot, comprising a traveling device, a supporting arm, a first hydraulic cylinder, a supporting plate, a chain saw, a first electric cylinder, a first pair of tongs, a second electric cylinder, a second pair of tongs, a pruning device, two lead screw supports, two first stepper motors, two sliding supports, two lead screws, two track boards and two second stepper motors. The automatic lumbering and pruning robot can achieve automatic operation of lumbering, pruning and fixed-scale cutting, thus improving the work efficiency greatly, reducing the labor intensity of workers, and guaranteeing the safety of the workers to the greatest extent.

A tensioning mechanism for adjusting tension of a cutting chain in a chain saw. A rotatable knob operates with an engine chassis, clutch cover, and guide bar, whereby the knob may be rotated between a tightened position and loosened position, by which the guide bar is loosened and may be adjusted. The knob is provided with a knob handle, pivotally connected to the knob and pivotable between locked and unlocked positions. When the knob handle is in the locked position, at least one, but not all, of a plurality of handle engagement points engage with corresponding fixed engagement points that are fixed relative to the clutch cover. When the knob handle is in the unlocked position, the handle engagement points are disengaged from the fixed engagement points. Further, the engagement points are visible when the knob handle is in both locked and unlocked positions.

A chainsaw includes a body housing, an elongated guide bar projecting forward from the body housing, a saw-chain mounted on the periphery of the guide bar for rotation, an electric motor mounted within the body housing for rotating, and a top handle provided on an upper portion of the body housing above the guide bar and extending in a fore-and-aft direction. A plurality of rechargeable battery packs is mounted on the body housing as a source of power supply for the electric motor. The battery packs are mounted to the body housing in such a manner that a center of gravity of the chainsaw observed from the back side is positioned in a two times extent of lateral width of a gripe portion of the top handle at both sides of a vertical centerline of the gripe portion.

A very unique universal bi-directional firing spark plug for any spark ignited internal combustion engine, whether racing, industrial, truck, aeronautical, automotive, recreational or residential (for trimmers, edgers, brush cutters, leaf blowers, leaf vacuums, chain saws, augers, tillers, lawnmowers, riding mowers, tractors, generators, etc.). This spark plug eliminates misfire and improves gas mileage, peaks engine performance, horsepower, and increases the RPM range, while utilizing and enhancing current ignition systems. In addition, this spark plug serves as a low emission device that reduces the effects of global warming, acid rain, and smog via greatly reduced emissions through vastly improved fuel combustion within all internal combustion engines by operating at a 24:1 air-to-fuel ratio. This unique spark plug is comprised of an elongated or non-elongated body with an electrical connector at one end. An absolute aerodynamic semispherical dome or sphere electrode is secured to the other end of the body. At least one absolute aerodynamic semicircular electrode is also secured to the body adjacent to the dome or sphere electrode such that the semicircular electrode has its inner surface equidistantly spaced from the dome or sphere electrode's surface. The electrodes can be fabricated from various metals, alloys, and/or precious metals and can also be coated with various metals, alloys, and/or precious metals. Alternate embodiments of the invention include two, three or four or more semicircular electrodes, all of which have a surface equidistantly spaced from the aerodynamic semispherical dome or sphere electrode along its complete arc length.

An antivibration device is mounted between a motor unit (1) having an internal combustion engine (2) and a vibration-insulated unit (3) of a portable handheld work apparatus (4) such as a motor-driven chain saw, cutoff machine, suction/blower apparatus or the like. The antivibration device (5) includes a vibration damper (6) made of foamed elastic material (7).

A muffler assembly for an internal combustion engine of a portable handheld work apparatus such as a motor-driven chain saw, cutoff machine or the like includes an exhaust-gas muffler (1) which has a muffler housing (10). The muffler housing (10) is formed essentially from two half shells (24, 25) connected substantially fluid-tight to each other. The interior space of the muffler housing (10) includes at least two chambers (2, 3) which are partitioned from each other by a partition wall (4). A catalytic converter (5) is mounted in the partition wall (4). In the interior space of the muffler housing (10), an exhaust-gas inlet (6) opens which is connected to an exhaust-gas stub (9) of the cylinder (8) of the engine. The exhaust-gas muffler has an exhaust-gas outlet (7) which conducts exhaust gas from the interior space. The exhaust-gas muffler (1) is connected with threaded fasteners at at least three attachment points (22, 23) to the cylinder (8) in order to obtain a good fixation of the exhaust-gas muffler on the cylinder (8) of the engine. At least two attachment points (22) are arranged in the region of the exhaust-gas stub (9).

A brake triggering device with a pivotably mounted trigger arm (1) located in connection to a handheld working tool's, mainly a chain saw's (2), rear handle (3), with a throttle control (4) and a handle opening (5) located below the handle (3), so that the trigger arm (1), when the saw changes inclination in relation to the operator's forearm, e.g. at the event of kickback or fall, is actuated by the operator's hand or arm, whereby the trigger arm (1) via a transfer mechanism actuates a brake (9) so that this stops the movement of the saw chain. The pivot (10) of the trigger arm is located in connection to a front (11) or a bottom (12) side of the handle opening (5).

A chain saw includes a guide bar (1) for a saw chain, a housing (3), a sprocket wheel cover (4), and at least one stud (5) fixed on the housing (3) for threadably fastening the sprocket wheel cover (4) and the guide bar (1). The free thread end (7) of the stud (5) has a maximum usable screw-in depth (t_max) for a nut (6) to be screwed thereon. A stop (9) for the sprocket wheel cover (4) having a stop surface (10) as well as a support surface (11) for contact engaging the stop surface (10) are provided. In the mounted state of the guide bar (1), a distance (a) remains between the stop surface (10) and the support surface (11). The support surface (11) contact engages the stop surface (10) of the stop (9) when the guide bar (1) is removed and the nut (6) is tightened and the nut (6) is screwed onto the studs (5) with a stop screw-in depth. The stop (9) is configured in such a manner that the maximum usable screw-in depth (t_max) is greater than the stop screw-in depth.

The invention employs a blower of the type used by commercial landscapers. The device has an engine mounted on a frame. Shoulder straps attached to the frame allow the user to wear the device on his back leaving the hands of the operator free to operate other tools such as a chain saw or perform other tasks. Also, wearing the device on the back makes it easier to transport the device over long distances to the source of the fire or backfire to be started.

The device's blower generates a stream of air at high speeds. This stream of air can be used to feed a fire when the air is directed at a fire. When used to extinguish a fire, air from the blower is tapped from a point 180 degrees removed from the blower output and mixed with exhaust from the engine. This mixture is diverted through a Y-shaped valve into the airstream coming out of the blower. When the device is used to start backfires a fire is started. The airstream, without the mixture of air and engine exhaust can be used to both encourage the propagation of the fire and direct the fire towards the main wild fire. The ability to quickly spread the backfire in the proper direction is imperative because a sudden change in wind direction or other weather conditions could cause the backfire to become as big a problem as the original fire.

A saw chain for a power chain saw is provided and comprises drive links and side links that connect them, whereby alternatingly disposed on one and the other longitudinal side of drive links, in place of a side link, are a cutter link and a leading safety link. The cutter link has a cutter tooth and a leading depth limiter, whereby the safety link is provided with a projecting nose for support against the base of a cut. The nose extends in the direction toward the depth limiter. The safety link is provided with a side portion disposed in front of the nose. The side portion has an elevated contact surface, which, when the saw chain is curved in the reversing region, is disposed on the path of a top cutting edge of the cutter tooth, and when the saw chain is extended reaches at least nearly to the height of the depth limiter.

The invention discloses an intelligent tree climbing and pruning robot, which comprises two crawler wheels, a vehicle body, a lower fixing claw, a first stepping motor, a lower bracket, a first hydraulic cylinder, a lower crank, a second hydraulic cylinder, an upper crank, a third hydraulic cylinder, an upper bracket, a second stepping motor, an upper fixing claw, a top tray, a rotating ring and a chain saw assembly. The intelligent tree climbing and pruning robot is characterized in that the two crawler wheels are mounted on the two sides of the vehicle body respectively; the lower fixing claw is fixedly mounted on the vehicle body; and the first stepping motor is fixedly mounted on the lower fixing claw. The intelligent tree climbing and pruning robot is compact in structure, small in size, high in automation degree, suitable for operation in regions with small space, such as urban roads, residential areas and the like, can prune trees safely and efficiently, and greatly reduces the labor intensity of workers.

The manufacture process of chain wheel for chain saw includes the following steps: powder metallurgy process to produce gear blank with sorted materials; precise forging through soaking graphite milk or coating graphite or setting in nitrogen protection, fast induction heating to 815-950 deg.c for less than 20 sec, fast forging in closed mold and demolding to reach gear density greater than 7.7 g/cu cm; assembling the gear to hub; and brazing and hardening in the protection of nitrogen with small amount of hydrogen inside a brazing furnace with fast cooling gas system for gas quenching to harden through phase change to reach hardness over HRC58. The manufacture process is simple, and has high production efficiency, low cost and high product precision and quality.

A crankcase scavenged internal combustion engine (1) of two-stroke type, primarily intended for a handheld working tool, such as a chain saw, with a cylinder (2) and piston (4) reciprocating along the cylinder wall (3), which piston separates a combustion chamber (5) above it and a crankcase volume (6) below it, and in the cylinder wall (3) there are ports (7, 8, 9, 10, 10') arranged for inlet (11), exhaust outlet (12) and for a number of scavenging durct (13, 13'), whereby at least one auxiliary duct (14) is arranged with an auxiliary port (15) in the cylinder wall, which auxiliary port (15) is opened and closed by the piston, and whereby the inlet is divided into: a fuel inlet (16) leading to a fuel port (7) and an air inlet (17) leading to an air port (8), and these ports are opened and closed by the piston (4), which also comprises a transfer space (18), which mouth edges are limited by the piston periphery, and which, in at least one piston position, creates a connection between the fuel port (7) and the auxiliary duct's port (15), so that fuel can be supplied to the auxiliary durct (14) via the auxiliary port (15), and then, after the port (15) later on has been opened by the piston, can flow into the combustion chamber.

The invention discloses a non-blasting construction method of a hard-rock tunnel in a city. The method comprises following steps: step 1, cutting an outer shell grove along the tunnel excavation contour in a horizontal direction with a chain saw cutter in order to form a continuously-enclosed free face; step 2, utilizing the chain saw cutter to inwardly cut the cutting groove in a horizontal direction according to the set trajectory on the tunnel face and dividing the tunnel face into multiple small blocks; step 3, utilizing a crush head to crush and remove fragmented rocks on the tunnel face. The method of utilizing the chain saw cutter and the crushing head is taken for mechanically excavation. Therefore, construction speed is quickened and input in tunneling cost and equipment is reduced. In the complex situation in the city, the construction method is applied to the hard-rock tunnel so that safety, reliably and efficiency are obtained; no influence is caused to the ambient environment and residents living in the ground; easy control of overbreak of the tunnel around is obtained; and the construction method is convenient and easy to promote.

A chain saw hazard warning light and method for using same. A pair of oppositely-directed light sources emit light beams throughout a chain shot hazard warning zone through rectilinear, slotted openings at opposite ends of a housing. The light beams turn on, if and only if, the cutting chain is rotating about the chain guide bar; alternatively, initiation of rotation of the cutting chain is delayed to permit the light beams to turn on some time prior thereto. The zone is defined by first and second pairs of planes that diverge in opposite directions from the chain guide bar, said planes being disposed at equal, acute angles (most preferably 15°) to, and on opposite sides of, a plane that includes the chain guide bar.

A retaining assembly is provided for a tensioning arrangement for adjusting the tension of the cutting chain in the chain saw. The retaining assembly includes a rotatable knob that operates in conjunction with the chain saw's engine chassis, clutch cover, and guide bar and is rotatable about an axis of rotation between a tightening position for holding the guide bar in place and a loosening position enabling the guide bar to be repositioned whereby the tension in the cutting chain is adjusted. A locking mechanism is provided for locking and unlocking the knob for rotational movement. When the locking mechanism is in a locking position, moveable engagement points of the locking mechanism extended beyond the confines of the knob and engage fixed engagement points. When the locking mechanism is in the unlocking position, the moveable engagement points, having moved inwardly of the confines of the knob, are disengaged from the fixed engagement points.

A chain saw includes a housing, a sprocket wheel which is provided in the housing for driving a saw chain, and a chain guide for guiding the movement of the saw chain. The chain guide extends out longitudinally from the housing and is movable longitudinally relative to the housing. The chain saw includes a chain tensioning device. The chain tensioning device comprises a driven member arranged on the chain guide and a driving member which drives the driven member to move the chain guide longitudinally and a rotating device rotating the driving member. A stepless clutch device is arranged between the rotating device and the driving member. The chain tensioning device presses the chain guide while it tensioning the saw chain. Thus it prevents effectively the chain guide from loosing after the saw chain is tensioned. The operation of the chain tensioning device is labour-saving. The chain tensioning device has a stable structure and it is hard to be worn.

A chainsaw holder adapted for receiving a chainsaw bar and chain within an interior compartment of a mounting piece. A pressure piece fits at least partly within the interior compartment and is forced by an operator against the chainsaw bar to capture it within the compartment. The operator is adjustable to release the chainsaw bar. The operator may be a screw operator which bears upon the pressure plate. The pressure plate may have an end flange for keeping it positioned within the interior compartment. The mounting piece preferably has flanges which allow fasteners to extend therethrough and secure the apparatus to the side wall of a supporting structure such as the wall of a pickup bed.