Abstract: A portable circular saw includes a base. A saw blade has a portion projecting downward from the base. A saw-blade cover conceals at least a part of the saw blade. A projection provided on the saw-blade cover protrudes in a direction away from the saw blade. The projection has a lower surface extending across a first plane which is parallel to an axis of rotation of the saw blade, and which contains a tangent to an outer circumference of the saw-blade at a point of intersection with a second plane including a lower surface of the base. Chips fly from the point of intersection along a direction in the first plane. The lower surface of the projection inclines relative to a line perpendicular to the tangent so as to change a path of a portion of flow of the chips toward a forward side as viewed in a cutting direction.

Abstract: A hand-held power tool includes a cutting blade within a housing 5 and a guard 10 placed over the operating head of the tool. The guard is movable in the direction 1 in order to expose the blade during cutting. The sliding mechanism is improved by maintaining alignment between the guard and the head over a larger distance. In one embodiment, this is achieved by sliders (FIG. 8) in grooves 9. Contact over a larger range reduces the likelihood of jamming and improves handle precision. Alternative embodiments provide structure for indicating the blade position (FIG. 11), and a frangible retaining washer for disengaging the cutting blade (FIGS. 13 to 15).

Abstract: A portable circular saw providing high visibility to a cutting mark line and sufficient operability even in case of an angled cutting. A slant position fixing member upstands from a front side of a base, and a tiltable plate is provided pivotally to the base. A front end of a saw cover is connected to the tiltable plate by a pivot pin. A main body roratably supporting a circular saw blade is pivotally movable by a pivotal movement of the tiltable plate to change inclination of the circular saw blade relative to the base. The tiltable plate is positioned in confrontation with the slant position fixing member, and fastening unit fixes the tiltable plate to the slant position fixing member to maintain a desired inclination of the circular saw blade. The fastening unit includes a thread extending through an arcuate slot formed in the slant position fixing member and engaging the tiltable plate, and a lever fixed to one end of the thread.

Abstract: A movable handle for a power tool. The power tool comprises a housing, a motor supported by the housing and operable to drive a tool element about an axis, and a handle supported by the housing for rotation relative to the housing about the axis. Preferably, the power tool is a circular saw. The circular saw further comprises a switch assembly supported on the handle for movement with the handle and means for connecting the switch to the motor to accommodate movement of the switch relative to the motor. The switch assembly is electrically connectable to the motor and selectively connects the motor to a power source, and the connecting means includes a wiring arrangement. The circular saw further comprises a locking assembly for locking the handle in a position relative to the housing.

Abstract: An undercut saw (10) having a central axis (11) generally comprises a cutting assembly (20) and a base (60). Cutting assembly (20) comprises case (30) housing electric motor (24) that drives shaft (40), upon which saw blade (50) is mounted. Base (60) supports cutting assembly (20) above a support surface and comprises cylindrical sleeve (63) supporting case (30) such that central axis (11) is vertical, horizontal portion (94), and vertical leg portion (96) extending down from the periphery of horizontal portion (94) and terminating in foot (98) for resting on a support surface. Case (30) and sleeve (63) are cooperatively adapted such that case (30) can be selectively moved vertically within sleeve (63) and retained in the selected position so as to adjust the height of blade (50) relative to foot (98). In a first preferred embodiment, case (30) and sleeve (63) include cooperating screwing devices for adjusting blade (50) height. Line cord (26) departs motor assembly (22) along central axis (11).

Abstract: The present invention relates to a laser alignment device of a circular saw, including a rotary disk base, a protective cover, and a magnetic ring base. The rotary disk base is mounted on a drive shaft of a circular saw. The rotation shaft of the motor may rotate the drive shaft to rotate the rotary disk base, so that the rotary disk base may be rotated at a high speed, and the silicon steel plates and the armature coil of the rotary disk base may be rotated at a high speed. Thus, an induced current may be produced between the silicon steel plates and the armature coil of the rotary disk base and the stator member of the magnetic ring of the magnetic ring base, so as to provide an electrical energy to the laser generator.

Abstract: The present invention relates to a laser alignment device of a circular saw, including a rotary disk base, a protective cover, and a magnetic ring base. The rotary disk base is mounted on a drive shaft of a circular saw. The rotation shaft of the motor may rotate the drive shaft to rotate the rotary disk base, so that the rotary disk base may be rotated at a high speed, and the silicon steel plates and the armature coil of the rotary disk base may be rotated at a high speed. Thus, an induced current may be produced between the silicon steel plates and the armature coil of the rotary disk base and the stator member of the magnetic ring of the magnetic ring base, so as to provide an electrical energy to the laser generator.

Abstract: A wheel attachment apparatus for a portable circular saw having a circular blade driven by a motor for cutting a workpiece into a cut-off portion and a remaining portion during a cutting process. The wheel attachment apparatus includes a flat bottom plate attached to the circular saw and to be placed above the working piece to support the circular saw during the cutting process, and having a slot opening to allow the circular blade of the circular saw to pass through for cutting the workpiece under the bottom plate. A set of roller wheels is attached to the bottom plate such that when the circular saw is used to cut the workpiece, the set of wheels is brought into contact with the workpiece and elevates the bottom plate so that there is no contact between the bottom plate and the workpiece and instead the wheels are rolling on the workpiece to reduce any friction between the bottom plate and the workpiece and ease the movement of the circular saw during the cutting process.

Abstract: A detachable circular saw guard for providing additional protection while using a circular saw. The detachable circular saw guard includes a panel having a first end edge, a second end edge, a first side edge and a second side edge. The panel has an inner surface and an outer surface. The panel has an arcuate shape such that the first and second side edges generally have a half-circle shape. A coupling element is attached to the inner surface of the panel for removably coupling the panel to the blade guard.

Abstract: For a power saw, a dust-capturing device composed of two sides shields with one side shield having an exhaust duct adapted to be attached to a hose of an external vacuum and a rear panel to aid in capturing and containing dust generated by the saw's use; and the other side shield having a top and rear beveled portion disposed toward the saw to aid in capturing and containing dust generated by the saw's use. The side shields may be of a one-piece or two-piece construction and are adapted to be securely attached to a saw at or near the upper blade guard of the saw. Capturing dust with only one side shield is effective; but, use of both side shields increases the effectiveness. The attachment mechanism to attach the device to the saw may be stationary or adjustable to accommodate any adjustments necessary for varying depths of cuts.

Abstract: A kerf deflector for a circular saw is mounted by wedging the deflector between a mounting bolt on the saw and a lip on the table of the saw. The deflector is constructed of clear plastic sections enabling the user to align the advancing blade with the cut line on the board. One section scoops up air from the rotating blade and directs the air between another section and the board surface being cut. The narrowing construction of the air passage strengthens the stream of air on the basis of the venturi principle.

Abstract: A metal cutting circular saw is provided with an upper blade guard which includes a first sight window disposed in a first side surface and disposed in a plane angularly offset from a plane of the blade. The upper blade guard also includes a second sight window disposed in the second side surface of the upper blade guard. A light window is disposed in a front portion of the perimeter outer surface of the upper blade guard. The upper blade guard is made from metal and the first and second sight windows and the light window are integrally formed as a one-piece member. The saw shoe and lower blade guard are configured to minimize chip spray from contacting a user.

Abstract: The present invention involves an air empowered circular saw apparatus for the cutting of material by either a left handed or a right handed operator. The apparatus includes an elongated base plate with a support frame extending from one side thereof; and an output housing supported on the distal end of the support frame, with an elongated drive motor housing supported on one side of the support frame. A saw blade is supported on the opposed side of the support frame, wherein the drive motor housing is swingable about an axis of rotation of an output shaft through the output housing to permit handed control of the air powered saw apparatus to be changed.

Abstract: A saw having a rotating blade and a laser beam alignment system, a rotating, multi-sided member having reflecting surfaces formed on each edge being mounted to one side of the rotating saw blade. A laser device is positioned in front of the blade guard with a mounting bracket, the beam generated thereby being reflected by the multi-sided member onto a work piece. The laser beam provides a visual cutting line to enable the saw operator to align the work piece accurately.

Abstract: An undercut saw (10) having a central axis (11) generally comprises a cutting assembly (20) and a base (60). Cutting assembly (20) comprises case (30) housing electric motor (24) driving blade (50). Base (60), supporting cutting assembly (20) above a support surface, comprises cylindrical sleeve (63), supporting case (30) such that central axis (11) is vertical, and shroud (61) terminating in foot (98) for resting on a support surface. Case (30) and sleeve (63) are cooperatively adapted such that case (30) may be selectively moved vertically within sleeve (63) and retained in the selected position so as to adjust the height of blade (50) relative to foot (98). Vacuum attachment (100), immediately adjacent cutting area (53) to maximize collection, vacuums cuttings from blade cavity (97). Blade guard (132) rotates to an extended position covering cutting area (56) of blade (50) so as to include cutting area (56) in blade cavity (97).

Abstract: An undercut saw (10) having a central axis (11) generally comprises a cutting assembly (20) and a base (60). Cutting assembly (20) comprises case (30) housing electric motor (24) that drives shaft (40), upon which saw blade (50) is mounted. Base (60) supports cutting assembly (20) above a support surface and comprises cylindrical sleeve (63) supporting case (30) such that central axis (11) is vertical, horizontal portion (94), and vertical leg portion (96) extending down from the periphery of horizontal portion (94) and terminating in foot (98) for resting on a support surface. Case (30) and sleeve (63) are cooperatively adapted such that case (30) may be selectively moved vertically within sleeve (63) and retained in the selected position so as to adjust the height of blade (50) relative to foot (98). In a first preferred embodiment, case (30) and sleeve (63) include cooperating screwing means for adjusting blade (50) height. Line cord (26) departs motor assembly (22) along central axis (11).

Abstract: A circular saw (1) includes a base plate (2) and a saw blade assembly (3) which in turn includes a lower blade guard (9) for covering a saw blade (6). The blade guard includes a sleeve portion (10) rotatably fitted on a bearing box (8) coupled to the saw blade assembly and a sectoral portion (11) which extends radially from the sleeve portion in the rear of the blade. A connecting bar (13) projects radially rearward from the sectoral portion at a 40-degree angle to the base plate. A spring (14) is stretched between the top of the connecting bar (13) and a lower rear portion of an upper blade guard (4) close to the base plate. When not in use, the blade guard is rotated to the closed position by the torque generated as the product of the spring's tensile force and the perpendicular distance (S) from the line of action or the force to the axis of rotation (O).

Abstract: A kerf deflector for a circular saw mounted by wedging the deflector between a mounting bolt on the saw and a lip on the table of the saw. The deflector is constructed of clear plastic sections enabling the user to align the advancing blade with the cut line on the board. One section scoops up air from the rotating blade and directs the air between another section and the board surface being cut. The narrowing construction of the air passage strengthens the stream of air on the basis of the venturi principle.

Abstract: A circular saw (1) cutting a workpiece at a generally right-angled corner formed between the workpiece and a structure is provided. The saw (1) includes a base plate (2) and a saw blade assembly (3) which has a saw blade (5) rotatably attached thereto and is tiltably mounted on the base plate by first and second pins (12,15) aligned with each other and oriented parallel to the saw blade. This arrangement permits the saw blade (5) to be manually tilted in two directions to desired angles with respect to the base plate (2) within a predetermined range. When the saw blade (5) is disposed at 90 degrees relative to the top surface of the base plate (2), the common longitudinal axis (O2) of the first and second pins (12) and (15) is spaced apart from the center plane (L) of the saw blade (5) toward the motor by a predetermined distance (S) as measured along a path orthogonally intersecting the center plane and the axis.

Abstract: A circular saw 30 includes a housing 32, a fixed upper guard 34, a movable lower guard 36 and a shoe 38. A saw motor 48 is selectively operated to rotate a circular saw blade 54 to facilitate the formation of a selective cut or kerf into a workpiece 57 under the control of an operator. A forward end 126, and a wing wall 138, of the upper guard 34 form an enclosed chamber 122 which is placed in close proximity with an adjacent surface 46 of the shoe 38 to essentially preclude chips from discharging through a slight space 39 therebetween. A trailing peripheral portion 148 of the upper guard 34 is formed with an inner radial path for receiving the lower guard 36 within the upper guard, and an outer radial path for management and directing of chips to a rear end 130 of the upper guard for discharging of the chips. A pair of stripes 102 and 104, and a sight window 90, are located on a forward portion of the surface 46 of the shoe 38 to assist an operator of the saw 30 in the accurate formation of the kerf.

Abstract: A hand tool is fitted with a fixed shield and a movable shield which is rotatably mounted around the fixed shield. The two shields are aligned with one another by each shield being keyed into a countersunk washer formed with an anchor slot for the fixed shield and a semi-annular guideway for the movable shield. A torsion spring normally biases the movable shield into a closed position about the fixed shield.

Abstract: A cutting implement for easily cutting into submerged pipes has a housing having a motor disposed therein. A first shaft extends outwardly from the housing in fixed fashion while a second shaft is pivotally connected to the first shaft permitting the second shaft to pivot into various positions with respect to the first shaft. A saw blade is rotatably connected to the second shaft. A transmission mechanism, which can be of any appropriate design, operatively connects the output of the motor to the saw blade for rotating the saw blade. A cover, which is radially rotatable about the second shaft, partially covers the flu saw blade in order to prevent debris from flying up and injuring the operator.

Abstract: A circular saw 30 includes a housing 32, a fixed upper guard 34, a movable lower guard 36 and a shoe 38. A saw motor 48 is selectively operated to rotate a circular saw blade 54 to facilitate the formation of a selective cut or kerf into a workpiece 57 under the control of an operator. A forward end 126, and a wing wall 138, of the upper guard 34 form an enclosed chamber 122 which is placed in close proximity with an adjacent surface 46 of the shoe 38 to essentially preclude chips from discharging through a slight space 39 therebetween. A trailing peripheral portion 148 of the upper guard 34 is formed with an inner radial path for receiving the lower guard 36 within the upper guard, and an outer radial path for management and directing of chips to a rear end 130 of the upper guard for discharging of the chips. A pair of stripes 102 and 104, and a sight window 90, are located on a forward portion of the surface 46 of the shoe 38 to assist an operator of the saw 30 in the accurate formation of the kerf.

Abstract: A movable handle for a power tool. The power tool comprises a housing, a motor supported by the housing and operable to drive a tool element about an axis, and a handle supported by the housing for rotation relative to the housing about the axis. Preferably, the power tool is a circular saw. The circular saw further comprises a switch assembly supported on the handle for movement with the handle and means for connecting the switch to the motor to accommodate movement of the switch relative to the motor. The switch assembly is electrically connectable to the motor and selectively connects the motor to a power source, and the connecting means includes a wiring arrangement. The circular saw further comprises a locking assembly for locking the handle in a position relative to the housing.

Abstract: A portable saw includes a saw unit that has a motor and a saw blade. The motor rotatably drives the saw blade. A base is adapted to rest on a workpiece to be cut. The saw unit is vertically movable relative to the base to vary a cutting depth into the workpiece. A cover prevents cutting chips from scattering to the surrounding area and is pivotable about a pivotal axis that is the same as the rotational axis of the saw blade. A control device controls the pivotal position of the cover in response to the vertical position of the saw unit relative to the base.

Abstract: A nozzle assembly for a power tool that generates dust includes a housing surrounding a portion of the power tool, an outlet section of the housing for accommodating the flow of dust away from the power tool and a conduit that is coupled with the outlet section to direct the flow of dust from the housing. During operation of the power tool, the conduit is rigidly coupled with the outlet section in an advanced position in which rotational movement of the conduit relative to the outlet section is impeded. The direction of dust flow out of the conduit may be selectively adjusted by transferring the assembly to a retracted position in which rotational movement of the conduit relative to the outlet section is substantially unimpeded. The outlet section and conduit may be tapered so that the advanced position is obtained through a friction fit.

Abstract: An apparatus for cutting grooves in a green concrete slab having at least one terminating side edge transverse to a broad top surface in a low cost manner is described and includes the following elements: a hand-held portable rotary saw, supported on a rollable platform disconnectably connected to and supporting the relative to the green concrete slab. The rollable platform includes a planar base in surface contact with a conventional guide plate of the saw, and flared side walls extending outwardly from the planar base an anchoring portion adapted to receive a human-generated force to provide rectilinear travel along a preselected direction over the green concrete slab. The planar base also includes a slot in alignment with an opening in the guide plate through which the saw blade extends whereby a working plane of reference is defined that intersects an axis of rotation of the saw blade whereby a maximum depth of cut is easily defined coincident with the working plane of reference.

Abstract: A movable handle for a power tool. The power tool comprises a housing, a motor supported by the housing and operable to drive a tool element about an axis, and a handle supported by the housing for rotation relative to the housing about the axis. Preferably, the power tool is a circular saw. The circular saw further comprises a switch assembly supported on the handle for movement with the handle and means for connecting the switch to the motor to accommodate movement of the switch relative to the motor. The switch assembly is electrically connectable to the motor and selectively connects the motor to a power source, and the connecting means includes a wiring arrangement. The circular saw further comprises a locking assembly for locking the handle in a position relative to the housing.

Abstract: A power tool has a body with a motor disposed therein. The motor has a saw blade coupled therewith. A guard covers at least a portion of the saw blade. A window is pivotally mounted to the guard and movable between an open position and a closed position. The window has an abutment surface. A deformable elongated member has a first end fixed to the guard and a second end that is free to move with respect to the first end due to the deformable nature of the elongated member. The elongated member has a first position wherein the second end rests adjacent the abutment surface to prevent opening of the window. The deformable member is in a generally linear configuration when in its first position such that attempted opening forces are transferred along the axis of the elongated member.

Abstract: A hand held circular saw for a portable circular saw 10 in which a viewing cutout 34 is provided through the housing 12 between an electric motor 14 and a blade guard support member 19. A transparent chip shield 32 is attached to the housing 12 and is pivotable between an operating position covering the viewing aperture and a raised cleaning position. In the preferred embodiment, notch engaging bosses 48 provided on the chip shield engage notches 50 in the housing 12 to snap lock the chip shield in the operating position.

Abstract: The disclosed portable circular saw includes a motor having an axis, a housing enclosing the motor therein, a handle carried by the housing, an arbor operatively connected to the motor, the arbor having an axis of rotation substantially perpendicular to the motor axis, and a shoe supporting the housing thereon. The housing is inclined at an angle relative to the shoe. The handle is also disposed between the housing and the shoe. Preferably, the housing inclination angle is about 45.degree.. The saw may also include a drive shaft disposed on the motor axis and a transmission mechanism connected to the arbor and the drive shaft. This transmission mechanism creates a torque in the rotational direction opposite to the rotational direction of the arbor. Preferably, the transmission mechanism includes a first gear disposed on the drive shaft, and a second gear disposed on the arbor, where the second gear meshes with the first gear.

Abstract: A power rotary hand saw (10) with a blade guard 36 mounted for powered movement between a guarding position (FIG. 1) and a nonguarding position (FIG. 2) is moved to the guarding position (FIG. 1) by a separate dedicated electrical motor (46) rotating a drive gear (42) linked with an elongate set of gear teeth (40) and returned when electrical power to the guard drive motor (46) is reversed by a guard control switch (49) separate and apart from a blade drive motor control trigger switch (34). Alternatively, power to the guard drive motor (46) is removed and a coil bias spring (52) return the guard (36) to the guarding position (FIG. 1). The guard driving mechanism (42, 44, 46) is mounted for movement between a drive position (FIG. 1) in which the drive mechanism is linked to the set of gear teeth (40) and a nondrive position in which the drive gear (42) is spaced from linkage with the set of gear teeth (40) and is disabled from responding to actuation of the guard drive power control switch (49).

Abstract: A saw assembly for a floor installer to use in undercutting baseboards, doors, and the like includes an electric motor subassembly having an electric motor and a spindle rotatably powered by the electric motor, a circular blade mounted on the spindle, and a blade guard subassembly. The blade guard assembly includes a moveable component adapted for movement to a retracted position that exposes more than 180 degrees of the circumference of the circular blade in order to facilitate the undercutting of a ninety degree inside corner. One embodiment uses a conventional handheld 11,000 rpm high speed grinder motor assembly with a right angle drive to power a high speed 4-inch blade in place of a grinder wheel. Carrying the undercut saw with a grinder wheel, sanding wheel, and a tile cutting blade adds functionality.

Abstract: A powered circular saw blade on a vertical shaft is supported on a slide which is slideably mounted on a guideway having feet to enable moving the assembly around on a building sub-floor. The feet are adjustable to enable raising or lowering the guideway base and, thereby, the saw blade. A blade guard is affixed to the guideway base and shaped to admit the saw assembly to an inside corner of a building room. The blade is normally retracted behind the blade guard but can be advanced to position ahead of the guard as the guard is braced against a door jamb or the like and the slide is pushed toward the door jamb to advance the blade into cutting position. Immediately upon release of the advancing force manually applied, a return spring returns the blade to retracted protected position.

Abstract: An apparatus for cutting grooves in a green concrete slab having at least one terminating side edge transverse to a broad top surface in a low cost manner is described and includes the following elements: a hand-held portable rotary saw, supported on a rollable platform disconnectably connected to and supporting the relative to the green concrete slab. The rollable platform includes a planar base in surface contact with a conventional guide plate of the saw, and flared side walls extending outwardly from the planar base an anchoring portion adapted to receive a human-generated force to provide rectilinear travel along a preselected direction over the green concrete slab. The planar base also includes a slot in alignment with an opening in the guide plate through which the saw blade extends whereby a working plane of reference is defined that intersects an axis of rotation of the saw blade whereby a maximum depth of cut is easily defined coincident with the working plane of reference.

Abstract: An apparatus for limiting deflection of the armature shaft 38, 38', 103 of an electrically powered tool, such as a hand held saw 10 or drill 91. In saw 10, the armature shaft 38, 38'extends as a cantilever from the motor 14 and has a geared connection 58, 60 to an arbor 44 for driving the saw blade 18. An arrangement for limiting the deflection of the armature shaft 38, 38' comprises a pilot member 72, 84 and a socket 68, 82 associated, respectively, with one and the other of the armature shaft and a motor housing supported wall. The socket 68, 82 is larger in cross-section than that of the pilot member 72, 84 and limits transverse deflection of the armature shaft 38, 38' away from its axis of rotation A. If the saw 10 stalls in the material being cut, force is transmitted from the geared connection 58, 60 to the armature shaft 38, 38'.

Abstract: The disclosed portable circular saw includes a motor having an axis, a housing enclosing the motor therein, a handle carried by the housing, an arbor operatively connected to the motor, the arbor having an axis of rotation substantially perpendicular to the motor axis, and a shoe supporting the housing thereon. The housing is inclined at an angle relative to the shoe. The handle is also disposed between the housing and the shoe. Preferably, the housing inclination angle is about 45.degree.. The saw may also include a drive shaft disposed on the motor axis and a transmission mechanism connected to the arbor and the drive shaft. This transmission mechanism creates a torque in the rotational direction opposite to the rotational direction of the arbor. Preferably, the transmission mechanism includes a first gear disposed on the drive shaft, and a second gear disposed on the arbor, where the second gear meshes with the first gear.

Abstract: A saw shoe is provided for use on a hand-held circular saw which has a saw blade for cutting a workpiece. The saw blade has an identified direction of travel. The shoe rides upon a top surface of the workpiece. The shoe has a base with an aperture extending therethrough which accommodates the saw blade. The base further has a top surface and a generally planar bottom surface. The base has a first edge which is located forwardly of the saw blade with respect to the direction of travel of the saw blade, and a second edge opposite said first edge. A pair of opposing side edges extend between the first and second edges. The base further has an opening extending therethrough from the top surface of the base to the bottom surface. The opening is located adjacent to the first edge and at least a portion of the opening is in co-linear relation to the direction of travel of the saw blade so that the user of the saw can view the workpiece through the opening.

Abstract: A window assembly is provided for use on a hand-held circular saw. The window assembly has a transparent member that is attached to an upper guard of the saw in a covering relationship with an aperture provided in the upper guard. A projecting rib is provided that is coupled to and which extends outwardly from the guard adjacent the forward edge of the transparent member. The projecting rib substantially prevents light emanating forwardly of the saw from reflecting off of the member.

Abstract: A rip guide for a circular saw. The circular saw includes a housing including a shoe plate for supporting the circular saw on a workpiece. The circular saw also includes a motor supported by the housing and a saw blade rotatably driven by the motor about an axis. The saw blade is operable to cut the workpiece in a cutting direction. The guide comprises a support member supported on the housing; an arm supported by the support member and extending from the housing in the cutting direction; and a guide member supported by the arm so that the guide member is pivotally supported by the support member. The guide member extends from the housing in the cutting direction. The guide member includes first and second guide surfaces for selectively guiding the circular saw relative to first and second edges, respectively, of the workpiece. The guide member is pivotable between a working position and a stored position.

Abstract: A cutting machine having a rotatingly driven cutting tool (2) and a tool guard (1). The tool guard (1) has a first tool guard part (11) which is fixedly mounted with respect to the apparatus and a second tool guard part (12) which can be pivotably mounted relative to the first tool guard part (11). Each tool guard part includes side walls (30, 32) lying adjacent to respective sides of the cutting tool and a center web which connects the two side walls to each other. The center web (31) extends curved in the peripheral direction and is disposed above the cutting tool (2). In order to perform a disturbance-free pendular cut, the pivotable second tool guard part (12) carries a slide piece (40) which projects beyond the end edge (34) of the center web (31) and has a rounded outer slide surface (35) facing away from the center web (31). The end edge (34) faces away from the fixed first tool guard part (11).

Abstract: A cast saw for removing hard orthopaedic bandages, for example formed of plaster is disclosed. The cast saw is a unitary device containing a rechargeable battery pack in a removable filter form collection chamber. A shroud covers at least a portion of the saw blade and such shroud is movable by the cutting operation from the interference of the casting material as the blade is received within the casting material while cutting through such casting material. A dust channel is formed within the housing and dust and debris caused by the cutting operation is pulled through such dust channel by the forces applied by impeller rotated by an electric motor received within the housing. A pressure sensitive switch is supplied which senses an increase in force on the saw blade and increases the current supplied to the motor proportionally in order to provide additional torque to the motor.

Abstract: An improved blade guard stop for a circular saw. The circular saw includes a saw blade driven by a motor for rotation about an axis, a blade guard rotatable about the axis between a covered position, in which the saw blade is covered, and an uncovered position, in which the saw blade is exposed, a biasing member biasing the blade guard toward the covered position, and a flexible spring member to absorb the rotational force of the blade guard and to absorb the biasing force of said biasing member. In the preferred embodiment, the spring member is a leaf spring. Additionally, the circular saw includes an adjustable shoe plate which changes the direction of impact of the blade guard on the spring member. The spring member absorbs the rotational force each adjusted direction. Also, the spring member and the blade guard are constructed of low friction materials so that movement of the blade guard against the spring member does not impede adjustment of the shoe plate of the circular saw.

Abstract: An apparatus for limiting deflection of the armature shaft 38, 38', 103 of an electrically powered tool, such as a hand held saw 10 or drill 91. In saw 10, the armature shaft 38, 38' extends as a cantilever from the motor 14 and has a geared connection 58, 60 to an arbor 44 for driving the saw blade 18. An arrangement for limiting the deflection of the armature shaft 38, 38' comprises a pilot member 72, 84 and a socket 68, 82 associated, respectively, with one and the other of the armature shaft and a motor housing supported wall. The socket 68, 82 is larger in cross-section than that of the pilot member 72, 84 and limits transverse deflection of the armature shaft 38, 38' away from its axis of rotation A. If the saw 10 stalls in the material being cut, force is transmitted from the geared connection 58, 60 to the armature shaft 38, 38'.

Abstract: The invention relates to a splinter shield comprising a protective cover (20) for a substantially plane, circular tool, e.g. a cutting wheel (6), circular-saw blade or the like, which is rotatable about a rotation axis (31) and which, together with the splinter shield, can be fitted on a tool carrier (5) on a manually operated machine (1), which protective cover (20) is intended to house a section of the tool and has a through-running fixture hole (27) for the splinter shield on the side facing the tool carrier. What distinguishes the invention is that the side of the protective cover which contains the fixture hole is double-walled around the fixture hole, the walls (30, 60) in a region around the fixture hole being arranged at a distance (H) apart.

Abstract: A new Automatic Guard Lifting System for automatically elevating a lower guard on a conventional circular saw thereby preventing the lower guard from interfering during cutting of an object.The inventive device includes a motor having a shaft secured to the circular saw, a sleeve having a slot secured within an upper guard, a cable connected to the shaft and the lower guard, and a limiting switch electrically connected to the motor.

Abstract: The disclosed portable circular saw includes a motor having an axis, a housing enclosing the motor therein, a handle carried by the housing, an arbor operatively connected to the motor, the arbor having an axis of rotation substantially perpendicular to the motor axis, and a shoe supporting the housing thereon. The housing is inclined at an angle relative to the shoe. The handle is also disposed between the housing and the shoe. Preferably, the housing inclination angle is about 45.degree.. The saw may also include a drive shaft disposed on the motor axis and a transmission mechanism connected to the arbor and the drive shaft. This transmission mechanism creates a torque in the rotational direction opposite to the rotational direction of the arbor. Preferably, the transmission mechanism includes a first gear disposed on the drive shaft, and a second gear disposed on the arbor, where the second gear meshes with the first gear.

Abstract: A circular saw including a lower bladeguard which is retractable by a remotely operated mechanism. This mechanism includes a lever which is pivotally mounted adjacent an auxiliary handle for the saw. The operator may retract the lower bladeguard by depressing the lever with the operator's left thumb while continuing to grip the auxiliary handle.

Abstract: A window assembly is provided for use on a hand-held circular saw. The window assembly has a transparent member that is attached to an upper guard of the saw. The transparent member has a forward edge and a rearward edge and slopes downwardly to form a rearwardly facing acute angle with respect a planar base of the saw. The acute angle has a minimum value to prevent light from overhead sources from reflecting into the user's eyes and has a maximum value to prevent light from forward light sources from reflecting into the user's eyes. The forward edge of the transparent member is located rearwardly of the point at which a predetermined line intersects the guard. Additionally, a lower blade guard is provided for use on a circular saw having a clear viewing window on the upper blade guard. The lower blade guard has a truncated portion that allows a line of sight between the workpiece being sawed and the clear viewing window even when the lower guard is in a fully retracted position.

Abstract: A hold-and-release device for the movable lower guard of a hand-operated circular saw in which the guard is held in its out-of-the-way position by a magnet or latch while a saw cut is being made but is automatically released to assume its normal protective position when the motor power is removed. Alternatives are described having different degrees of complexity, for example, one requires the operator to apply pressure to the trigger switch while engaging the guard-holding device.