Abstract: Power tools such as cutting saws with rotary powered blades are described. Also described are various accessories for tools used with cylindrical workpieces such as pipes are described. The accessories include a clamp and saw joint assembly, various quick connection assemblies between a saw and a clamping system, a plunge guide assembly, a latch plate assembly, an interlock switch, a blade guard system, and a chip management system or chip deflector. Also described are related methods of use.

Abstract: A ring saw blade includes a flat annular support which has a side face and an outer circumference. One or more cutting elements are disposed along the outer circumference. An annular groove is recessed into the side face and has a radially inner flank and a radially outer flank. The radially inner flank is conical and a first cone describing the radially inner flank has a half opening angle of between 10 degrees and 30 degrees.

Abstract: A ring saw includes a ring saw blade, a tool holder that guides the ring saw blade in a cutting plane, a motor, and a driving wheel where the ring saw blade is drivable in the cutting plane by the driving wheel and the driving wheel is coupled to the motor. A guide roller is disposed on a first side of the cutting plane where the ring saw blade is guidable by the guide roller from the first side. A guide roll is disposed on a second side of the cutting plane where the ring saw blade is guidable by the guide roll from the second side. The guide roll is disposed in a hood that is pivotable relative to the cutting plane.

Abstract: A saw blade positioning mechanism for an annular sawing machine includes a protective case, two first driven wheels, two second driven wheels, and an adjustment component. The protective case conceals a portion of an annular saw blade. The first and second driven wheels are rotatably disposed at two opposing ends of the protective case and abut against two opposing lateral sides of the annular saw blade, respectively. The adjustment component is disposed at the protective case to drive the protective case to move in the radial direction of the annular saw blade relative to the annular saw blade. The position of the protective case is adjusted with the adjustment component such that the first and second driven wheels get positioned in place synchronously with displacement of the protective case. The protective case can be demounted so that the first and second driven wheels are simultaneously removed and changed.

Abstract: A power saw includes an electric motor, an impact assembly, and a blade retaining assembly. The impact assembly is coupled to an output shaft and includes a hammer member and an anvil member. The blade retaining assembly is coupled to the impact assembly and includes a blade coupling configured to connect to a saw blade. The impact assembly is configured to operate in a first mode when a mechanical load on the blade retaining assembly is below a threshold value. The impact assembly is configured to operate in a second mode when the mechanical load on the blade retaining assembly is greater than or equal to the threshold value. The hammer member is maintained in a fixed position relative to the anvil member when the impact assembly operates in the first mode. The hammer member intermittently impacts the anvil member when the impact assembly operates in the second mode.

Abstract: A device is provided for venting a burning structure by cutting an opening in the roof the burning structure. The device may comprise an elongated shaft or pole with a power means and blade means at opposite ends or the same end thereof, and a drive means for conveying power from the power means to the blade means, and an actuator means for moving the blade means in at least one plane with respect to the shaft or pole.

Abstract: The present invention generally pertains to a saw device. More particularly, the present invention relates to a handheld centerless saw. The saw comprises a frame and a pair of driving rollers mounted to the frame for rotation. The saw also comprises an annular blade mounted between the drive rollers and functionally engaged thereby, where the blade defines frontward and backward hemispheres. At least two guide wheels are mounted to the frame, or to a cover mounted to the frame, the guide wheels being positioned in the backward hemisphere of the blade. The guide wheels are operatively engaging the inner circular edge of the blade. A drive assembly mounted to the frame is operable for urging the countersense rotation of drive rollers, thereby causing rotation of the blade.

Abstract: The present invention generally pertains to a saw device. More particularly, the present invention relates to a handheld centerless saw. The saw comprises a frame and a pair of driving rollers mounted to the frame for rotation. The saw also comprises an annular blade mounted between the drive rollers and functionally engaged thereby, where the blade defines frontward and backward hemispheres. At least two guide wheels are mounted to the frame, or to a cover mounted to the frame, the guide wheels being positioned in the backward hemisphere of the blade. The guide wheels are operatively engaging the inner circular edge of the blade. A drive assembly mounted to the frame is operable for urging the countersense rotation of drive rollers, thereby causing rotation of the blade.

Abstract: The present invention generally pertains to a saw device. More particularly, the present invention relates to a handheld centerless saw. The saw comprises a frame and a pair of driving rollers mounted to the frame for rotation. The saw also comprises an annular blade mounted between the drive rollers and functionally engaged thereby, where the blade defines frontward and backward hemispheres. At least two guide wheels are mounted to the frame, the guide wheels being positioned in the backward hemisphere of the blade. The guide wheels are operatively engaging the inner circular edge of the blade. A drive assembly mounted to the frame is operable for urging the countersense rotation of drive rollers, thereby causing rotation of the blade.

Abstract: The present invention generally pertains to a saw device. More particularly, the present invention relates to a handheld centerless saw. The saw comprises a frame and a pair of driving rollers mounted to the frame for rotation. The saw also comprises an annular blade mounted between the drive rollers and functionally engaged thereby, where the blade defines frontward and backward hemispheres. At least two guide wheels are mounted to the frame, or to a cover mounted to the frame, the guide wheels being positioned in the backward hemisphere of the blade. The guide wheels are operatively engaging the inner circular edge of the blade. A drive assembly mounted to the frame is operable for urging the countersense rotation of drive rollers, thereby causing rotation of the blade.

Abstract: The ring-shaped saw blade and an associated saw blade drive are provided as an easy exchangeable tool preset for a hand guided saw. The saw is distinguished by high stability, low weight proper, high flexibility as well as high precision and is suitable for an easily to handle and quick connection with a high speed compact and a hand guided electrical drive unit. The ring-shaped saw blade exhibits circular disposed flank toothing on two sides, wherein the flank toothing runs in a radial direction on two sides. The saw blade with the two cited flank toothings engage into a front side groove of an eccentrically disposed friction wheel, wherein the groove faces of the friction wheel in each case are equipped with the flank toothing which engages into the flank toothings of the saw blade. The saw blade drive comprises a drive wheel on a drive shaft, a drive pinion and a friction wheel on a gear shaft, which is disposed parallel to the drive shaft.

Abstract: A circular saw including a motor housing having a first end portion and a second end portion, a motor assembly disposed within the housing, a rotary blade assembly having a predetermined weight mounted to the first end portion of the motor housing, and a battery pack having a predetermined weight disposed on the second end portion of the motor housing. The battery pack and the rotary blade assembly are configured and arranged to be in longitudinal alignment with one another, and the longitudinal alignment of the battery pack with the rotary blade assembly promotes counterbalancing between the predetermined weight of the rotary blade assembly and the predetermined weight of the motor housing.

Abstract: A drive wheel for centerless drive of an annular saw blade of a cutting machine. The drive wheel includes a drive ring having concentrically arranged first and second annular elements, each of which has a first beveled side surface located radially outward from a second beveled side surface. The second beveled side surfaces are in contact with one another and the first beveled side surfaces together define a wedge-shaped drive groove for the inner edge of an annular saw blade that is to be driven by the drive ring. Third and fourth annular elements are arranged concentrically with, and outboard to the first and second annular elements located therebetween. The third and fourth annular elements are configured to inwardly compress upon the first and second annular elements. An anti-relative-rotation member interconnects the first and second annular elements to prevent relative rotation therebetween while driving the annular saw blade of a cutting machine.

Abstract: A cutting system and method of use for manually cutting rigid foam insulation panels; the present cutting system is operated manually and requires no electric power whatsoever; the cutting system includes a fully adjustable carriage assembly whereon a cutting blade is mounted for traversing the limits of its working surface; the cutting system provides a measuring scale having graduated indicia inscribed thereon for conveniently changing blade settings to accommodate different foam panel dimensions; the cutting system produces a uniformly accurate cut surface comparable to a factory-made surface without damaging the foil moisture barrier on the rigid foam panel; the cutting system completely eliminates the health and safety hazards created by airborne foam particulates that are produced by powered cutting of such rigid foam materials and thereby provides an environmentally-friendly building practice; and the present cutting system is completely portable enabling its setup and use at any construction site or l

Abstract: Working tool and machine for sawing or cutting, comprising an annular blade (2) intended to be rotated about an axis of rotation, encircling the axis of rotation, the annular blade comprising an annular blank (3; 3?) and means (15), e.g. diamond segments (15), forming the working part of the tool and provided in connection to an outer edge (31) of the blank (3; 3?), the blade and blank also having an inner edge (19), an inner edge portion (18) comprising driving surfaces for rotation of the tool about the axis of rotation, and a web portion (23) between the outer edge (31) of the blank and the inner edge (portion) (18), the web portion having a first side (24) and a second side (27).

Abstract: It is an object of the invention to provide a dust collecting circular saw in which cooling air to cool the motor can be further effectively utilized. According to the present invention, a representative dust collecting circular saw may comprise a blade, a motor, a cooling fan, a dust case, a dust case cover and an air space between the dust case cover and the dust case. The cooling air to cool the motor is designed to be introduced into the air space. Therefore, according to the invention, heat of the dust case caused by hot chips collected within the dust case can be prevented from being transferred from the dust case to the dust case cover by the air space into which the cooling air is introduced. Thus, the user of the circular saw can securely be escaped from contacting any circular saw members heated by the hot chips within the dust case.

Abstract: The present invention generally pertains to a saw device. More particularly, the present invention relates to a handheld centerless saw. The saw comprises a frame and a pair of driving rollers mounted to the frame for rotation. The saw also comprises an annular blade mounted between the drive rollers and functionally engaged thereby, where the blade defines frontward and backward hemispheres. At least two guide wheels are mounted to the frame, the guide wheels being positioned in the backward hemisphere of the blade. The guide wheels are operatively engaging the inner circular edge of the blade. A drive assembly mounted to the frame is operable for urging the countersense rotation of drive rollers, thereby causing rotation of the blade.

Abstract: The invention relates to a driver (1) for a twin cutting device (2), which comprises a first blade (4), which is non-rotatably arranged on a drive shaft (11) to be rotated about an axis of rotation (r) in a first direction, and a second blade (3), which is non-rotatably arranged on a drive socket (15), which encloses the drive shaft (11), to be rotated about the same axis of rotation (r) in a second direction opposite to said first direction.

Abstract: A drive wheel for centerless drive of an annular saw blade of a cutting machine. The drive wheel includes a drive ring having concentrically arranged first and second annular elements, each of which has a first beveled side surface located radially outward from a second beveled side surface. The second beveled side surfaces are in contact with one another and the first beveled side surfaces together define a wedge-shaped drive groove for the inner edge of an annular saw blade that is to be driven by the drive ring. Third and fourth annular elements are arranged concentrically with, and outboard to the first and second annular elements located therebetween. The third and fourth annular elements are configured to inwardly compress upon the first and second annular elements. An anti-relative-rotation member interconnects the first and second annular elements to prevent relative rotation therebetween while driving the annular saw blade of a cutting machine.

Abstract: A battery powered circular saw includes a rechargeable battery removably attached to the housing and an adjustable shoe pivotally attached to the housing for controlling a depth of cut. A locking mechanism for preventing relative movement between the adjustable shoe and the housing includes a clamp that is located so as to permit the battery pack to be inserted to and removed from a rear end of the housing in a direction that is generally parallel to a plane in which the circular saw blade is disposed.

Abstract: A power tool, in particular a circular saw, for eccentrically a rotatable working tool and, in particular, a circular saw blade, includes a roller device (13) supported on a tool housing (6) and having at least two roller pairs (12, 16) each having a first roller (10, 14) and a second roller (17, 19) engageable with opposite sides of the working tool (4), with at least one of the rollers (10, 14, 17, 19) of at least one roller pair (12, 16) being rotatable by a tool motor (8) which is located in the housing (6), for driving the working tool (4), and a pivot device (20) for pivoting the first rollers (10, 14) together relative to the second rollers (17, 19) between a release position in which the working tool (4) is brought in or removed from the roller device (13), and a drive position in which a forcelocking connection between the at least one of the rollers (10) of the at least one roller pair (12, 16) and the working tool (4) is established.

Abstract: An electric powered rotary saw for cutting medical cast or the like includes a cylindrical housing, a removable longitudinally extending mounting member and a rotary circular saw blade disposed at one end of the mounting member. The saw blade is fixed to a shaft for rotation about an axis which is generally perpendicular to the longitudinal axis of the mounting member, but slightly offset therefrom. A variable speed electric motor is disposed in the housing and includes a shaft which extends forwardly in a direction parallel with a mounting portion of the longitudinal member. A frusto-conical driver member of an elastomeric material is fixed to the end of the shaft and engages the circular blade to displace a portion of the blade out of its normal plane of rotation by an angle of about 5 degrees and for rotating a circular blade.

Abstract: A dual position sharpening device can be set up so that the abrasive wheel is either vertical or horizontal. A guard retains cooling water in either position.

Abstract: A battery powered circular saw includes a rechargeable battery removably attached to the housing and an adjustable shoe pivotally attached to a guard assembly for controlling a depth of cut. A locking mechanism for preventing relative movement between the adjustable shoe and the housing includes a depth of cut strap disposed adjacent a first sidewall of the housing. A lever is disposed adjacent a second sidewall of the housing. A tightening element interconnects the depth of cut strap and the lever. The battery powered circular saw additionally includes a handle extending from the housing. The handle is disposed substantially parallel to a direction of cut and oriented horizontally above the housing. The rechargeable battery pack includes a pair of laterally spaced apart guide rails which cooperate with the pair of longitudinally extending grooves to permit sliding movement of the rechargeable battery pack in a direction parallel to the direction of cut.

Abstract: A rotary knife having a ring blade that defines a closed loop cutting surface for cutting material which the ring blade contacts during rotation. Materials cut using the blade such as meat cut from a carcass or trimmed from a piece of meat are suctioned away from the blade. The material is drawn into a blade housing which supports the ring blade. A housing body has a wall that defines a housing interior into which material separated by the cutting surface of the ring blade moves as it is cut. The blade housing body defines a bearing surface that is defined by a wall of the housing body that supports the ring blade and allows the ring blade to rotate with respect to the blade housing. Alternate coupling designed of the housing body allow the blade housing to be coupled to a suction tube for withdrawing meat from the interior of the blade housing.

Abstract: An electric powered rotary hacksaw includes a cylindrical housing, an integral longitudinally extending mounting member and a rotary circular hacksaw blade disposed at one end of the mounting member. The hacksaw blade is fixed to a shaft for rotation about an axis which is generally perpendicular to the longitudinal axis of a mounting member. A variable speed electric motor is disposed in the housing and includes a shaft which extends forwardly in a direction parallel with the longitudinal member. A frustoconical driver member of an elastomeric material is fixed to the end of the shaft and engages the circular blade to displace a portion of the blade out of its normal plane of rotation by an angle of about 5 degrees and for rotating a circular blade.

Abstract: An electric powered rotary hacksaw includes a cylindrical housing, an integral longitudinally extending mounting member and a rotary circular hacksaw blade disposed at one end of the mounting member. The hacksaw blade is fixed to a shaft for rotation about an axis which is generally perpendicular to the longitudinal axis of a mounting member. A variable speed electric motor is disposed in the housing and includes a shaft which extends forwardly in a direction parallel with the longitudinal member. A frustoconical driver member of an elastomeric material is fixed to the end of the shaft and engages the circular blade to displace a portion of the blade out of its normal plane of rotation by an angle of about 5 degrees and for rotating a circular blade.

Abstract: A circular saw for more precise movement during cutting with a laser alignment system for projecting a maker onto a workpiece to align with a target line to be cut. The laser alignment system comprises a housing, a laser generator, an internal battery which can be replaced without the aid of a tool, a switch which can be independently positioned within the housing and be turned on or off independently or a switch which can be positioned near the main switch of the circular saw and be actuated together with the main switch. The laser line projected by the laser alignment aligns with the plane of a saw blade of the circular saw. Thus, the saw blade can follow the target line by aligning the laser line with the target line.

Abstract: A battery-operated hand power tool (10), in particular a power saw (101), having a housing (12) into which a battery pack (28) can be detachably inserted in captive fashion, and between the battery pack (28) and the housing (12), an elongated auxiliary tool (38) is stored, in particular for releasing the tool, preferably the saw blade, is made more secure and convenient to manipulate by disposing the auxiliary tool (38) in such a way that it is visible from outside and is easy to feel, and in particular can be reached through.

Abstract: A cutting and grinding tool for removing grout from between tiles comprises a rotatable cutting disc formed with a plurality of radially extending teeth about the circumference of the disc. A drive gear engagable with the teeth is rotated by a power drill to exert a drive force to rotate the cutting disc. The disc teeth serve a dual function of performing a cutting and grinding operation and transmitting the drive force of the drive gear to rotate to the disc. The tool is simple in construction, reliable in operation and easy to control in order to efficiently remove grout from between tiles.

Abstract: A versatile saw that can be used as a high-branch-pruning saw, etc., employing an annular internal toothed saw disk having internal teeth on its internal circumference. Each of a pair of openable holders support the periphery of an annular two-piece internal toothed saw disk and maintain the internal toothed saw disk in an annular form with the holders closed. An object is cut by the internal teeth by rotating the internal toothed saw disk maintained in an annular shape while being held by the holders along its periphery. The rotating internal toothed saw disk is capable of stopping at a prescribed position of the holder. Split internal toothed saw disks are held by the holders which are openable. The holders are opened to facilitate the placing of the object inside the internal toothed saw disk. In order to introduce the object inside the internal toothed saw disk, one part of the annular internal toothed saw disk can incorporate a cut section so that the saw disk can be opened at this cut section.

Abstract: A device in connection with a hand-operated working machine with a water flow directed to the working tool comprises a first control which is a control (15) for a drive motor (3) for the tool, and a second control which is a control (17) for the water supply to the tool. A water control valve (45) in a water supply conduit (14) can be adjusted to adopt chosen opening positions, and is arranged constantly to be kept open in any chosen opening position when the motor is running the tool under influence of the drive motor control. The chosen opening positions are adjustable, i.e. the through opening of the valve can be increased or decreased by using water supply control (17).

Abstract: A rotary knife having a handle having a head section, a blade housing that comprises a split, ring-like member supported by the head section and defining a circumferentially extending groove, an annular blade supported in the blade housing groove for rotation about a central axis. The blade housing comprises a ring-like member having an annularly extending blade supporting groove that opens radially inwardly and in which the blade is rotatably disposed. The groove peripheral wall defines a plurality of blade engaging bearing faces spaced apart throughout the blade housing periphery and a plurality of circumferentially spaced apart fat receiving recesses. The blade housing also defines a plurality of fat directing channels each communicating with a fat receiving recess for directing fat from the recess out of the blade housing.

Abstract: A portable, combustion engine powered cutting or sawing machine comprises a rear part (1) with a motor housing (3) with a combustion engine (4), an engine block (5) with a crank house, and a front part (2) with an annular blade (30) and a blade holder (31). The blade is provided in/or adjacent to a center blade (37) of the machine. The engine block forms a central body in the machine, including portions of said body on both sides of said center plane, and the blade holder comprises a blade holder chassis (35), which is provided substantially on a first side of said center plane. The blade holder chassis is fixedly connected on one hand with the portion of the engine block, which is located on said first side of the center blade, and on the other hand with a portion which is located on a second, opposite side of the center plane.

Abstract: The invention relates to a portable, hand-operated working machine (1) with a tool which is rotatable by an engine through a driving shaft (20), and a transmission comprising a centrifugal coupling, a driving belt (8) and a driving wheel with a groove (7) for the driving belt fitting in said groove, which driving wheel comprises an outer (3) and an inner (4, 4′) half of the driving wheel, wherein the outer half (3) of the driving wheel consists of an inner wall of a coupling drum (11) being part of the centrifugal coupling, which drum is rotated by the driving shaft when the centrifugal coupling is in the operative state.

Abstract: A device in connection with a cutting machine with an annular saw blade and with a driving mechanism for off-center drive of the blade. The device includes two first rollers arranged to contact and roll against the web of the saw blade on one side of the blade and two second rollers arranged to contact and roll against the web of the blade on the other, opposite side of the blade. The first rollers are mounted on a first shaft, which is movable along a path against the plane of the saw blade, perpendicularly to the centerline of the shaft, for pressing the first rollers with a certain desired force against the blade web under counter force by the second rollers on the opposite side of the blade.

Abstract: A drive wheel for off-center drive of an annular saw blade in a cutting machine, consists of at least two components, which are separable but held together during operation, namely a holding disc and a drive ring, the latter having an encircling drive groove for the inner edge of the saw blade, the drive ring being arranged radially outside a central portion of the holder disc.

Abstract: A sheetrock panel cutting device that is attachable to the end of a conventional metal tape ruler and uses that same tape ruler to not only measure the opening but to also guide the cut of a sheetrock panel while accomplishing both these functions without removing the tape ruler therefrom. A utility knife is inserted into a preformed slot in a base plate which causes the blade of the knife to be aligned juxtaposed to the right angle clip of the tape ruler. The blade protrudes through the base plate and which is directly mounted against the right angle ruler end clip. The device is used to cut a rectangular panel of sheetrock of predetermined size from a full sheet by holding the utility knife, which is positioned in the device, against the sheetrock paper surface with one hand while grasping the metal tape ruler surface, at a previously measured position on the tape, with the other hand against the edge of the sheetrock panel.

Abstract: A power tool is provided having a housing with a handle for an operator, a rare earth permanent magnet motor oriented within the housing having a rotary output portion operatively driving an implement. The motor has a relatively high horsepower output for its size enabling the location of the motor relative to the implement and the handle to be functionally and ergonomically optimized.

Abstract: A miniature motorized hand held dental saw wherein, like with a coping saw, the axis of rotation of the handle of the dental saw is tangent with the outer diameter of the blade. This important characteristic, combined with the use of a flexible blade, enables the operator to change, as needed, the direction of the cut without any snagging or binding effects. The dental saw is composed of a main steel body on which are attached three flanged Teflon.TM. coated bearings that support and guide a 0.004 thick annular diamond coated blade. The rotation of the blade, on these flanged bearings, is created by a drive assembly consisting of two opposite wheels, a drive wheel and a follower wheel, each wheel composed of a hub on which is fitted a neoprene o-ring. The opposite o-rings create an equal pressure on both faces of the blade which they make rotate. The power is transmitted to the assembly by means of a drive cable that is connected to a motor situated in a remote stationary work station.

Abstract: A light weight electric-powered radial saw intended to cut overhead limbs employs a housing having a forwardly direction U-shaped receiving yoke, and a rearwardly directed fitting which receives an elongated handle. An annular saw blade is rotatively supported within the yoke by a plurality of idler rollers journaled to the housing. An electric motor positioned within the housing has a drive shaft that extends in parallel relationship above the saw blade. A drive transmission device such as a gear is interactive between the drive shaft and the saw blade.

Abstract: A fluid cooling device for a circular saw of centerless type having a ring-shaped saw blade, designed to be rotated about a fictitious center of the saw blade and with at least one disc (8, 108), mounted on the radially inner side of the ring-shaped saw blade. Mounting elements (9, 17) are provided at a rear part of the disc. At least one conduit (20) for a cooling or rinsing agent is provided with an inlet (22) for the conduit in the rear part of the disc and at least one outlet opening (25, 125) in the foremost part of the disc. The outlet opening (25, 125) is located adjacent the periphery of the disc and directed essentially parallel with or with an acute angle relative to a tangent at the interior edge (6) of the blade adjacent the outlet opening.

Abstract: An annular saw blade has a outer periphery with cutting or tearing members (15), an inner periphery or inner edge and an annular web portion (16) between the inner and outer peripheries. The saw blade (8) has at least one annular drive surface of a flexible, polymeric solid material (14), against which flexible drive surface a rotatable drive member (13) is intended to be pressed to effect the rotation of the saw blade about its center of rotation. An annular saw for this saw blade has at least one rotatable drive member (30) with projections (37) intended to be pressed into said flexible material of the saw blade.

Abstract: A tree saw includes a frame adapted to be attached to the boom of a prime mover, a tree clamping mechanism on the frame, and a carriage assembly on the frame below the clamping mechanism. The carriage assembly includes a generally plate-like chassis, a generally U-shaped bulkhead upstanding from the chassis and providing a recessed base portion and forwardly-extending arm portions, and a slide mechanism on the arm portions. A rail mechanism on the frame receives the slide mechanism for reciprocating movement of the carriage assembly. A hydraulic cylinder assembly interconnects the bulkhead and frame for reciprocating the carriage assembly. An annular rim member rotatably mounted on the chassis has a geared inner circumference and a toothed outer circumference projecting forwardly of the base portion. A motor-driven pinion mechanism on the chassis engages the rim member inner circumference to rotate the rim member.

Abstract: A method and apparatus for cutting trees and bushes including a circular disk having cutting teeth connected thereto, a motor for rotating the disk and an arm connected to the motor for moving the disk into contact with trees and bushes.

Abstract: An improved ring saw having a disk-shaped saw body with a cutting ring mounted to rotate about the saw body. The cutting ring has an inwardly directed flange that fits within a slot in the peripheral edge of the saw body. Cutting teeth are mounted in the ring. Drive means mounted on the saw body rotate the cutting ring about the saw body to have the saw cut into a tree as the saw body is moved toward the tree.

Abstract: The invention relates to an annular circular saw blade (8) with imaginary center axis and with a plane of symmetry (19) which is perpendicular to the imaginary center axis, an inner rim section (14) with a first drive surfaces (22) provided to work in conjunction, through friction coupling, with second drive surfaces (38) on a rotating drive unit (30); an outer rim section (15) with cutting devices and between them a web portion (16) with an underside (17) and a topside (18), with at least one of the said sides (17, 18) exhibiting at least a first annular bearing surface (25) provided to work in conjunction with a second annular bearing surface (45) on a support element (40, 41) for holding the saw blade in position. According to the invention the said first drive surfaces (22) are provided in a groove (20) in the inner rim of the saw blade.

Abstract: In an annular saw force-exerting mechanism (56, 57) is provided so as to act on flange-equipped support rollers (40, 41) for the saw blade (8). The support rollers have at least one flange (44) engaging a groove in the web portion of the saw blade. The force-exerting mechanism acts essentially only in the axial direction of the support rollers essentially parallel to the plane of symmetry of the saw blade towards the centre of the saw blade. Alternatively, force-exerting mechanism is provided so as to act on a drive pulley for the saw blade essentially only in a direction perpendicular to the axis of rotation of the drive pulley, parallel to the plane of symmetry of the saw blade outwards from the centre of the saw blade. In both cases the drive surfaces (22, 38) of the drive pulley and the saw blade are pressed against each other, and the inner edge of the flange on the support rollers is pressed against the inner edge of the groove in the web portion of the saw blade.

Abstract: In an annular saw, that is to say a circular saw with an annular saw blade, the saw blade is adapted to rotate about an imaginary center axis by being driven via a drive shaft which is parallel to the center axis and has a fulcrum between the annular saw blade and its center. Mounted on the drive shaft (27) are two drive rollers (25, 26), of which the adjacent surfaces (41, 42) are bevelled at a certain bevel angle so that the rollers comprise drive surfaces which, between them, form a wedge-shaped groove (40). The two lateral surfaces of the saw blade (8) are bevelled in a corresponding manner within a region (13) close to the inner edge (15) of the saw blade, the bevel angle being the same as for the drive rollers, the bevelled edge portion of the annular saw blade being clamped between the bevelled drive surfaces of the drive rollers in the wedge-shaped groove.

Abstract: A tree felling head which includes a frame having a grapple mounted thereon with a grapple jaw which may be selectively opened and closed to respectively receive and grasp a standing tree and power means to selectively open and close the grapple; and a severing device mounted on said frame below said grapple for severing a standing tree. The severing device is a rim driven planar circular saw mounted around a peripheral portion thereof on an arm pivotally attached to the frame for movement in a plane transverse to the length of the standing tree, and included is a second power means for effecting rotation of said severing device.