Abstract: A cut waste discharging device for a circular saw blade of an electric power circular saw machine, which includes: a safety cover for covering an upper portion of the circular saw blade; a lower guard which is angularly movable into the safety cover in accordance with development of a cutting operation of a workpiece with the circular saw blade; and a partition wall provided along an inner peripheral wall of the safety cover so as not to interfere with the lower guard, thereby defining a passage of cut waste with the outer wall of the partition wall and the inner peripheral wall of the safety cover. With such an arrangement, the passage between the outer wall of the partition and the inner wall of the safety cover causes the cut waste, generated in the waste generating portion, to be led to a predetermined discharge place. Accordingly, the waste would not be splash within the safety cover and would not be splashed out of the predetermined discharge place.

Abstract: A Tongue attachment for a portable electric circular saw equipped with a lower retractable or pivoting blade guard in which in a closed position the guard covers most of the blade, to a retracted position in which the cutting edge is exposed to material for cutting. An interior wall of the lower guard of such conventional saws has a quarter-circular leading edge that serves as a point of sliding contact with the work piece as the saw cuts through the piece. An opposite, exterior wall of such conventional guards lacks a similar leading edge. Consequently, the lower guard of such saws of conventional design have a tendency to catch the concave wall of the face of the guard on the material being worked. This stops the saw from proceeding until the handle on the guard is used to lift it from this catching position. The Tongue attachment completely eliminates this problem. In an alternative embodiment, such a tongue is made an integral part of a lower guard.

Abstract: A circular saw for more precise movement during cutting comprising a circular blade with a peripheral edge having teeth and a power source to rotate the blade about its axis; a shield covering at least a portion of the blade to protect a user from the peripheral teeth of the blade; a blade plate positionable on the work piece to be cut with an elongated aperture for the passage therethrough of the blade, the blade plate having a notch at its leading edge in alignment with the plane of the blade; a laser device positioned on the shield to project a laser beam in a line from the notch along the workpiece to a line along the direction to be cut; means to power the laser with a visible light; and an optical element to fan the laser beam onto the workpiece in a line within the blade plane and intended direction of blade movement with an angular divergance between about thirty and sixty degrees.

Abstract: A hand circular saw comprises a base plate, a saw blade arranged so that at least one of an angle position of the saw blade and a miter angle is adjustable relative to the base plate, a clamping block supported by the base plate and provided with a turning guide slot, a clamping screw extending through the turning guide slot, and a supporting arm. The clamping block has a plurality of arresting pockets arranged along the turning guide slot, and the clamping screw carries at least one axially spring-biased displaceable arresting sleeve which is arrestingly positionable in a respective one of the arresting pockets.

Abstract: A guide for a hand-held tool having a housing to support a rotary cutter with a peripheral cutting formation and a motor to rotate the cutter. The guide having a rigid guide member with a peripheral wall to be disposed about the periphery of the rotary cutter, and a bracket to mount the guide to the housing. The peripheral wall having a slot therein through which portion of the rotary cutter projects to engage a workpiece, the degree of projection of the cutter being variable by relative pivotal movement between the bracket and the guide member. The bracket being configured to support the housing at a location spaced laterally from the guide member to provide additional stability to the guide member during operation.

Abstract: A dust collection apparatus which is usable with various types of hand-held power tools, such as high speed grinders, and which surrounds the cutting element of the tool in a manner to efficiently capture the debris produced during the cutting operation even when cutting overhead. The apparatus is provided with a novel spring-loaded work engaging foot which is movable relative to the cutting tool during the cutting operation in a manner to insure the effective capture of substantially all of the particulate matter generated during cutting operation.

Abstract: A motor driven hand power tool has a saw including a saw blade, a separating tool formed as a saw blade movable about a tilting axis extending parallel to a cutting line of sight and fixable in each turning position relative to a workpiece which is subdivided by a cutting joint into a product-side and a refuse-side with product and refuse-side cutting edges, a base plate over which the saw blade is positioned. The saw blade is arranged so that the tilting axis extends at a distance under a lower side of the base plate, and the distance is dimensioned so that the tilting axis in a working position of the power tool is located under an upper surface of the workpiece in an interior of the workpiece.

Abstract: A hand circular saw has a saw blade, a support plate, a rocker swivelling the saw blade on the support plate about a swivel axis, a splitting wedge carrier, a splitting wedge which is held on the splitting wedge carrier and a guide device swivelling the splitting wedge about an axis of the saw blade, the guide device being formed as a tension-transmitting drive.

Abstract: A telescopic movable guard surrounding a circle saw as its internal section equipped with a circular disc positioned so that the movement of the wood being cut is not impeded by the action of the saw blade and wood chips and forward movement in the lower guard is facilitated.

Abstract: A tile saw is arranged to include a drive motor and output shaft. The tile saw output shaft includes a fluid conduit in a further embodiment directing cooling fluid flow to the associated circular saw employing a drive fluid pump therefore. In a further embodiment, a modified circular sector hood is mounted about the saw directing fluid flow to the periphery of the circular saw in use.

Abstract: A portable circular saw with a dust collector for use in trapping fine dust raised in cutting cultured marble, concrete, masonry and the like has a deflector positioned above a discharge aperture in the front of an upper blade guard for directing the envelope of air moving in the direction of the circular saw blade out the discharge aperture where it is evacuated before it can spread into the workplace environment. The deflector has a slot through which the cutting tip of the circular blade passes.

Abstract: Objective of the invention is a pruning device for upright pruning of trees, to which pruning device belongs a shaft (1), an at the end (2) of the shaft through an articulated joint fastened support (3), an at the support fastened, rotatable cutting blade (4), an at the support fixed, with the cutting blade parallel running cutting support device (5) for leaning of the upright pruning device against the tree when cutting the branches as well as a with the cutting blade connected power source (6, 7) for the rotating of the cutting blade. When operating the present pruning devices the problem is the fact, that when using them the trunk of the tree is easily damaged, because the cutting is performed too close to the trunk of the tree.

Abstract: A circular saw comprises a motor housing 13 and a shoe 15 attached to housing 13. An upper guard 17 fixed to housing 13 shields an upper portion of blade 25. A lower guard is pivotally mounted relative to the blade axis of rotation 27. The lower guard has an extended position (FIG. 1 ) for covering a lower portion of blade and retracted position (FIG. 2 ) for exposing the lower blade portion for cutting. A chip deflector 67 is formed on the radial extremity of the trailing edge 55 of lower guard 19 to prevent the build up of sawdust chips on trailing edge 55 by guiding the chips inwardly toward blade axis 27 and into the path of blade 25.

Abstract: A belt tension system for a power tool such as a demolition saw. The system includes a driven gear and a drive gear. The drive gear is orientated perpendicular to the driven gear for more convenience access to adjust the driven gear and, hence, adjust the drive belt. The driven gear can include a second member movably connected to a first member. The second member has a threaded portion and a shaft portion. The first member has helical grooves to interact with the drive gear and a center hole with the second member shaft portion slidingly located therein. The first member can axially rotate the second member when it is axially rotated.

Abstract: The present invention discloses a shield that attaches to the upper guard of a hand held power saw. The shield prevents debris created by operation of the saw from hitting the user. The rotation of the saw blade creates moving air. The shield directs the moving air away from the saw and the user. The shield in translucent and can be made from polycarbonate.

Abstract: A hand-held circular saw is designed so that a fan exhaust air from a fan wheel is introduced into a sawdust duct along the shortest path in a duct arranged inside a gearing housing, in order to reinforce a conveying of saw dust in the sawdust duct. The fan air is fed parallel to the movement direction of the sawdust, effects a vacuum in the sawdust duct and prevents stoppage of the duct.

Abstract: A hood for a power tool, such as a grinding wheel on a saw, in which the hood is rotatable relative to the frame of the tool. The tool has a system for repositionably fixing the hood at selected locations. The system includes a detent connected to the hood with a plurality of lock notches and a longitudinally movable lock pin connected to the frame. The lock pin can be positioned into one of the detent notches to prevent the hood from moving and, can be longitudinally moved to disconnect the lock pin from the detent thus allowing the hood to be repositioned. The system includes a knob to axially rotate the lock pin, a cam member to longitudinally move the lock pin upon axial rotation, and a leaf spring to bias the lock pin in an engaged lock position with the hood detent.

Abstract: Flat multi-layered work pieces, such as panels with a decorative or finish surface coating (5), are prescored and cut through by the same saw blade to avoid damage to the surface coating. For this purpose a circular saw (1) is guided along a guide rail (7) and its saw blade (4) is adjustable to a prescoring depth and to at least one lateral prescoring position to make a first prescoring cut only through the cover layer (5) in a sawing direction in synchronism with the blade rotation direction. If necessary, the blade is adjusted to a second lateral prescoring position to make a second prescoring cut only through the cover layer (5) in a cutting direction in synchronism with the blade rotation. Finally, the saw blade (4) is adjusted to its full cutting depth and to a lateral position between the two prescoring positions and a full cut is made through the entire work piece (6) in a sawing direction counter to the rotation direction of the saw blade.

Abstract: An attachment is provided for a saw or other power tool having a rotary shaft and a circular blade mounted on the shaft. A substitute saw blade guard is fastened on the saw housing to define a dust confining channel about the periphery of a portion of the circular rotary saw blade. A shaft extension is fastened to the exposed tip of the shaft and an impeller is fastened to the shaft extension outside of the dust confining channel. A bonnet with an internal dust transfer passageway is secured relative to the dust guard to confine the impeller within an impeller enclosure. Operation of the rotary blade causes the impeller to rotate to create a suction, thereby drawing air and dust from the channel about the periphery of the rotary blade and into the vortex created at the axial center of the impeller. The impeller discharges air laden with dust from a discharge outlet in the impeller bonnet.

Abstract: A device for deflecting air produced by the rotating blade of a circular saw in the direction of the front of the blade for dispersing sawdust accumulated in front of the kerf. The device comprises a lamella adjacent the side of the blade adapted to deflect the air through an aperture in the blade protector. A roof shape member located in front of the aperture deflect the incoming air downwardly to produce a flow of air in front of the blade over the board to be cut.

Abstract: In a hand-held tool, a drive shaft (11) mounts a cutting or grinding disk (4) with a protective hood (5) partially enclosing the disk. The hood has an opening through which a portion of the disk projects. The hood (5) encloses a space divided by a guide wall (12) into a recovery space (14) extending inwardly from the hood opening and a diversion space (13) on the opposite side of the drive shaft from the hood opening. Waste material generated by the disk flows from the diversion space into an outlet stub (16).

Abstract: A hand-held tool for driving a cutting or grinding disk includes a housing and a protection hood with a sleeve-shaped extension detachable connected to the housing. A receptacle is mounted on the housing for releaseably holding the sleeve-shaped extension. The receptacle is formed as a slotted sleeve so that it has a variable diameter. The diameter is changed by moving circumferential ends of the sleeve toward or away from one another. The displacement of the sleeve ends can be effected by a lever pivotly mounted on the ends.

Abstract: A construction for a circular saw wherein the two parts of the clamshell housing are secured directly to the motor assembly from different respective sides thereof.

Abstract: An assembly and method for cutting through a cast of the type having flexible wrapping and a rigid outer shell. The assembly comprises a side plate having edges defining an elongate notch for receiving the cast, a cutting blade rotatably mounted on the side plate adjacent the notch, and means for rotating the cutting blade relative to the side plate. The edges of the side plate defining the notch include at least one cutting portion. The cutting blade is maintained in sliding scissors-like engagement with the cutting portion of the side plate to shear the cast between the cutting portion and the cutting blade as the blade is rotated.

Abstract: A hand-held, battery-operated rotary blade saw useful for cutting plastic clips or straps which secure a face mask to a football helmet. Several configurations, having differing safety shields, are disclosed. The device is an emergency/rescue tool to quickly remove a face mask from a football helmet allowing access to the face of a football player without removal of the helmet with its concomitant risk of cervical injury.

Abstract: A portable power driven tool includes a body having a motor therein and a handle. The handle includes a first grip portion to be grasped by an operator in one hand and a second grip portion to be grasped by the operator in another hand. The second grip portion is disposed at a position different from the first grip portion. A switch is provided in a circuit connecting the motor with a power source. The switch can be operated by the operator at the first grip portion so as to be turned on or off for starting or stopping the motor. For preventing the motor from being started by the switch, prevention means is operable by the operator at the second grip portion.

Abstract: A portable fleshing tool has a thin, circular blade mounted on a drive shaft of a motor. A front and a rear guard substantially protect the blade, with the rear guard removably attachable to the housing of the motor and the front guard removably attachable to the rear guard. The front guard is slightly vertically adjustable to permit slight adjustment of the depth of a fleshing cut because the fleshing blade is being operated in a plane perpendicular to the plane of the pelt or hide being fleshed.

Abstract: A chain saw attachment for driving a circular blade from a chain saw includes a chain mounted on a chain guide and driven by the chain saw motor. A sprocket is mounted at one end of the chain guide and is rotatable with the chain. A spindle is secured to the sprocket and is rotatble therewith. At least one housing member surrounds the sprocket spindle and has a flange section attached to the chain guide. The circular blade is connected to the sprocket spindle for enabling the circular blade to rotate with the spindle.

Abstract: This invention discloses a pneumatic cutter for concrete and the like in which: a suction pipe is provided on a circular arc-shaped case covering the upper half of a disk cutter member driven by air motor incorporated in a body, and a venturi section and an exhaust cylinder are provided in connection to the suction pipe in a row; a valve and a branched pipe are provided in connection to an air hose coupling cylinder in order, and in which a larger pipe of the branched pipe is connected to the air motor while a smaller pipe is connected to the venturi section; and an exhaust port of the air motor is provided on the body, and an exhaust nozzle which is provided on a surface where the circular arc-shaped case faces to the disk cutter member and the exhaust nozzle are connected to each other through a communicating passage.

Abstract: In a scrub-clearing tool of the type comprising a tube, a blade supported for rotation at one end of the tube, a motor for driving the blade and transmission shaft for connecting the drive motor to the blade, a disc is provided for protecting the blade and is mounted for rotation on the shaft of the blade with the interposition of a bearing. The protective disc has a diameter larger than the outer diameter of the blade and has a plurality of recesses around its periphery, the inner edges whereof are spaced from the center of the disc by a distance less than the radius of the outer circumference of the blade. The protective disc is normally rotated together with the blade. It stops when it comes into contact with the ground or with some obstacle, while the blade can continue to rotate by virtue of the presence of the bearing.

Abstract: A saw blade guard for a sawing power tool, particularly a mitre saw, comprises a protective element having two side walls each formed as a part of a circle, and a peripheral wall connecting the side walls with one another, the side walls having a center and an edge spaced from the center, the protective element being formed as an integral element and provided with a member in the region of the edge for turning the protective element as a whole.

Abstract: Powered rotary scalpel structure including a circular scalpel blade secured at one end of a blade support arm connected to a handle having a drive motor secured to the other end thereof and means extending through the handle and the blade support arm for rotating the circular scalpel blade on energization of the motor. The automatic rotary scalpel includes structure for releaseably securing the blade support arm to the handle and a remote switch for connecting the motor to an electrical power supply at the back of the handle from an actuating member from the front of the handle as well as an electric light and an electrical circuit which provides for the light always being on when power is supplied to the rotary scalpel. A circular scalpel blade is also disclosed along with blade protection structure, a support stand for the blade support arm and structure for controlling the depth of an incision made by the rotary scalpel structure along with modifications of the powered rotary scalpel structure.

Abstract: A portable circular saw includes a housing having an electric motor mounted therein. A circular saw blade is attached to the housing and is adapted to be driven by the electric motor. A handle is carried by the housing. A base plate is disposed below the housing and has an opening therein for receiving substantially the lower half of the saw blade. Support means is mounted on the front end of the base plate for supporting the housing for pivotal movement relative to the base plate, and has a stand portion disposed in laterally spaced apart aligned relation to the front end of the base plate. Thus, the circular saw may be rested in an upright position by the front end of the base plate and the stand portion of the support means.

Abstract: The invention includes a power operated circular type hand saw having a motor disposed within a housing, a rotating circular sawblade driven by the motor, and a work supporting shoe which is pivotally attached to the housing and moveable relative to the housing to adjust the depth to which the saw blade extends below the shoe. The motor supporting housing includes a locking arrangement and a depth limiting stop plate moveable relative to the housing, the stop plate having a depth limiting ear and a clasp, the clasp is adapted to lock the stop plate in a wide range of depth limiting positions.

Abstract: A guide shoe attachment for a clearing saw having a shaft defining a centerline, a transmission connected to the shaft including a hub rotatable in a predetermined blade rotation direction about an axis of rotation angled with respect to the centerline, and a circular blade connected to the hub. The guide shoe attachment has an elongate guide member extending radially outward from the hub generally in the direction of the centerline, parallel to and above the blade, providing a guide edge for guiding the saw. It includes a top plate forming a semicircular guard around for blade with fittings for connecting the attachment to the transmission at a position above the blade and forwardly of the transmission. The guide member includes a skid aligned with the guide edge. The guide edge is offset from a centerline of the clearing saw in the direction of blade rotation so that a tree contacting the guide edge is sawn within a kickback zone at the front of the clearing saw.

Abstract: An engine cutter wherein elongated box-like portions each having a trapezoidal cross-sectional shape, which are extended longitudinally at both upper and lower sides of an arm protruding forwardly of a main body, are formed symmetrically with each other with respect to the longitudinal center axis of the arm, and a thickness at the central portion of the arm connecting the box-like portions is determined to be smaller than the width of the base portion of the box-like portions, while the belt is extended within the space of the box-like portions.

Abstract: A releasable latching device (32) for a portable circular power saw (10) includes a pivotable latch member (32) for releasably latching or locking a guard member (22) for a rotary saw blade (20) in a guarding position, to preclude serious injury to an operator during use of the saw. The latch member (34) includes a hook (44) engagable in a first retaining notch (46) or a second retaining notch (50) in a hub (48) of the guard member (22) for this purpose, depending upon whether the saw (10) is being used to make a straight cut or a 45.degree. cut. The latch member (34) is retained in a latching positon by a spring biased push rod (52) and is moved to an unlatching position by operation of the push rod.

Abstract: An apparatus for simultaneously cutting and beveling plastic pipe such as water or sewer pipe is described. This apparatus includes a rotatable cutting head on which inclined and protruding cutting edges are provided to cut and bevel the pipe. The cutting head is mounted in a housing the lower surfaces of which include two convex pipe engaging regions positioned on either side of the cutting head which are contoured to contact the pipe and maintain the cutting head in proper cutting and beveling relation to the pipe when the housing is moved laterally or angularly relative to the pipe. Concave pipe engaging regions flank the convex regions to maintain the housing in contact with the pipe. The cutting bits are tapered to aid in retaining them in position in the cutting head.

Abstract: A portable power tool such as a portable circular saw is provided with a sawdust collection system based on the generation of an air flow resulting from rotation of a rotary cutting blade, with this air flow being guided to transport sawdust resulting from cutting operations along a guide path through a first discharge aperture into a dust box in which the sawdust is precipitated, with a low-velocity air flow then passing out of the dust box through a second discharge aperture to be recirculated through the flow path. Extremely effective dust collection is attained with a simple configuration, while the dust box can be positioned such that the weight of accumulated sawdust therein does not significantly affect the balance or ease of operation of the portable power tool.

Abstract: In a portable circular saw, the baseplate (8) is attached to the motor housing (1) in a manner such that the baseplate may be locked into position or slidably adjusted perpendicular to the saw blade (2) as desired. These features permit using the saw as a normal portable circular saw with a sufficiently protruding baseplate, and after a simple adjustment, also as a silhouette kerf saw with a minimally protruding baseplate. Thus, one tool serves both of these purposes.

Abstract: A cast cutter having a pair of juxtaposed, sawedged blades which oscillate relative to each other on a common pivot point to provide a scissorslike cutting action resulting in a relatively wide kerf in the cast being out. A patient protective blade guard, slidable between the underside of the cast and the patient's skin, includes an aperture into which portions of the blades partially extend wherein a nip area is provided at an interface location of the blades and the guard to facilitate cutting of an inner woven cloth lining of the cast to the scissor teeth. The oscillatory motion of the blades relative to each other minimizes clogging thereof by dust particles generated during a cutting operation. The blades are slightly spaced from each other to preclude friction generated heat buildup that could result from the moving blades rubbing together.

Abstract: The invention is directed to a safety arrangement for a power-driven portable tool such as a motor-driven chain saw or the like. The portable tool has a housing equipped with two handles both of which are grasped by the operator to hold and guide the tool during use thereof. One of the handles is a bail handle mounted at the forward part of the housing. The safety arrangement includes two switches associated with respective ones of the handles. The switches are operatively connected to the motor so as to cause the same to be operative only when both switches are closed. At least a portion of one of the contacts of the bail handle switch is displaceable from a first position whereat the bail handle switch is open to a second position whereat the switch contacts come into mutual contact and the bail handle switch is closed.

Abstract: A circular saw retaining arrangement where a circular saw blade is retained on a driven arbor shaft including an arbor plate located a selected distance from the end of the arbor and where the shaft of the arbor between the arbor plate and the end of the arbor shaft is threaded to receive an arbor nut, an improved means of securing the saw blade to the arbor including a collar of selected peripheral configuration to receive wrench means wherein the collar has a central aperture to receive the arbor shaft wherein one surface of the collar is roughened and adapted to be urged against the saw blade with the arbor nut threaded on the arbor shaft and tightened against the side of the collar opposite the side bearing the roughened surface.

Abstract: An improved portable circular saw with a pair of semicircular discs having a rotary sawing cutter disposed therebetween, the semicircular discs being fixedly secured to the upper surface of a table and vertically extending along the rotary sawing cutter with a close clearance kept therefrom, whereby remarkably high noise reduction and dust collection are ensured with substantially reduced danger of or without any danger of injuring of a part of a human body. According to another aspect of the invention a dust collecting device is provided having a dust collecting hood arranged above the upper half of the rotary sawing cutter, an inner wall included in the dust collecting hood to surround the central part of the rotary sawing cutter and a bottom plate on the table. A pair of semicircular plates may be fixedly secured onto the longer sides of the inner wall vertically extend along the rotary sawing cutter in the same manner as the aforesaid semicircular discs.

Abstract: A holder for supporting a rotary cutting blade such as a saw blade for an electric circular saw comprises a drive shaft rotatable on its own axis and having a larger-diameter portion and a smaller-diameter portion concentric therewith, a fixed flange fitted over the larger-diameter portion and having an annular support extending around and spaced radially from the smaller-diameter portion for mounting thereon the rotary cutting blade, and a removable flange having an annular projection inserted between the annular support and the smaller-diameter portion and secured by a screw axially to the smaller-diameter portion with the rotary cutting blade sandwiched between the fixed and removable flanges. The annular support and the smaller-diameter portion have distal ends lying axially flush with each other.

Abstract: A portable circular saw has a saw-blade compartment for accommodating a circular saw-blade, a motor compartment secured to the saw-blade compartment and projecting transversely therefrom away from the saw-blade, a rear handle extending rearwardly from the saw-blade compartment, and a forward handle connected to the saw-blade compartment and projecting transversely therefrom away from the saw-blade. The forward handle is hollow and defines a passageway therein which is in communication with the interior of the saw-blade compartment and is also adapted to be connected to a vacuum system, whereby this forward handle forms part of a sawdust removal system. Preferably, a strut forms part of and connects the forward handle to the motor compartment thereby defining a closed handle. The passageway in the forward handle is preferably connected to a fan in the motor compartment, but may be connected to an external source of vacuum.

Abstract: A blade housing device for a cast cutting tool which is used to remove a cast from a patient is disclosed. The housing device includes a housing having a side periphery through which a portion of the edge of the circular saw blade of the cast cutting tool projects varying distances. The housing is attached to the body of the cast cutting tool so that by rotating the cast cutting tool and hence the housing, a different portion of the side periphery can be presented to the cutting area. In this manner, the desired distance of projection of the saw blade, or the desired depth of cut, is easily selected by the user. The housing acts to collect the dust generated by the cutting and the dust can be removed by a suction hose attachable to the front of the housing. For easy blade changing, the housing is pivotally attached relative to the shaft on which the circular saw blade is mounted.

Abstract: A hanger for a portable power tool and the combination of the hanger and the tool. The hanger is secured to the tool handle along a wall thereof by a screw or screws which extends through a screw hole or holes provided to receive a screw or screws, respectively, to secure the handle to the tool housing. A wall of the hanger is contiguous or substantially contiguous with the wall of the handle. The screw holding the hanger to the handle and housing extends transversely to elongated directions of the contiguous walls and extends intermediate the wall ends. A channel is secured to the hanger and has its side walls extending over the above walls and along side walls of the handle, the screw extending through the side walls. This arrangement prevents pivoting of the handle with respect to the screw and handle, and securely fixes the hanger to the handle with respect to external forces on the hanger.

Abstract: A dust shroud for a portable circular saw is described comprising an upper blade housing, a lower blade housing, an external connecting link connecting the two and aligned with the saw blade, and flexible sealing means attached to the upper part of the lower blade housing. The thickness of the connecting link is not greater than the thickness of the saw blade and since the link is aligned with the saw blade it follows the saw blade through the kerf created by the blade in the worksheet. The upper blade housing is attached directly to the saw's motor housing and moves therewith while the lower blade housing is attached to the upper blade housing through the connecting link and is thus kept aligned with the upper housing as the saw cuts through the workpiece. The flexible sealing means keeps dust from escaping from the lower blade housing since it continuously conforms to irregularities in the surface of the workpiece.

Abstract: A hand held electrically driven cutter assembly for removing casts from the body of a patient includes a vertically articulatable bottom plate insertable between the cast and the body surface which on the interior of the cutter assembly forms a switch in series with a trigger switch connected to the main power. Two circular cutters, inclined relative each other, are disposed above and ahead of the bottom plate to open up a kerf therefor. The power to the cutters is transmitted through a pulley and gear combination to be driven by an electric motor. It is this electric motor that is series connected to the bottom plate switch and power will be applied to the cutters only upon upward urging of the cutter assembly.