Abstract: A pole-mounted, hand-held brush or vegetation trimmer is provided with a self-actuating braking device, and a fixed guard or a fail-safe articulating guard for selectively fully enclosing the rotating blade to prevent injury to the user.

Abstract: The present invention discloses an outer debris shield which attaches to the outer arch of the upper guard. This outer debris shield has a forward edge and a rearward edge having a mid point there in between. There is also an attachment edge that generally follows the alignment of the outer arc. Additionally, outer debris shield has a projecting edge which extends away from the upper guard as it approaches mid point. Additionally, the present invention provides an inner debris shield which attaches to the inner base of upper guard.

Abstract: A retention apparatus for an electrically powered hand-held circular saw having a retractable lower saw blade guard, that holds the lower saw blade guard in the retracted position as long as the power on/off switch is activated. This lower saw blade guard holder enables the saw operator to readily manipulate the saw with one hand while using the other hand to improve the safety environment of the cutting action, such as holding the material to be cut, or keeping the power cord out of the path of the saw during the cutting activity. In one embodiment, the lower saw blade guard holder comprises an electromagnet, wired to the power on/off switch, which holds a section of ferromagnetic material on the lower saw blade guard. Another embodiment of this invention has the lower saw blade guard holder mechanically latched by a latch that is mechanically coupled to the power on/off switch. In one embodiment, the lower saw blade guard holder also contains a lamp for lighting up the material being cut.

Abstract: A rotary saw having a housing equipped with a laser beam generator and an end cap with a slit through which a laser beam projects in alignment with a rotating cutting blade of the saw. The housing is mounted on the body of the saw immediately over the blade guard and the end cap is rotatably disposed on the housing whereby the emitted laser beam from the slit may be directed in alignment with the saw blade cut anywhere along a 180 degree angular path extending from the line of cut in front of the saw blade to a target remotely located above the saw. The saw blade can be directed to follow the target in order to align the cut with the target.

Abstract: The invention provides a guard arrangement including a guard member having an annular base provided with axially spaced apart first and second sets of radially inwardly extending and circumferentially spaced apart projections. The first and second sets of projections are circumferentially aligned and are alignable with axially extending grooves on a tool housing so that the guard member can be slid or snapped on and off the tool housing. To lock the guard member against removal from the tool housing, the tool housing is provided with a pair of annular grooves for receiving the projections on the guard member when the guard member is angularly shifted from a mounting position. To lock the guard member in a desired angular position, the guard member is provided with a finger-operated locking member that is engageable with detents located on the tool housing.

Abstract: A ventilating device in a power driven tool has a fan driven by a motor for cooling the motor and has an air flow channel for the air to flow to the outside after passing around the motor. The ventilating device includes an air passage member disposed in the air flow channel on the downstream side of the fan to form a part of the air flow channel. The air passage member includes a plurality of blow windows and a plurality of partition walls for separating the blow windows from each other. The blow windows are positioned in series in the rotational direction of the fan. The partition walls have different heights relative to and in the direction toward the fan such that the heights increase in the rotational direction of the fan.

Abstract: A tool for sawing plaster board being a hood spring loaded hingably attached to the motor of a circular saw such that the blade is completely enclosed in the hood when the saw is not in contact with the surface being cut. An adjustment screw is provided for adjusting the depth of cut. The hood is also equipped with a door with a spout attachable to a source of vacuum for withdrawing kerf.

Abstract: A movable saw guard electrically operated by a separate motor which through a gearing system moves the movable saw guard from a closed first position to an open second position upon activation of a switch that is separate from the saw motor's trigger.

Abstract: A fire fighter's tool for cutting through ceiling and wall panels which includes a base shaft within which telescoping expandable tubular sections are stored. The base shaft carries a power cord reel, counterbalance, and a control handle. A retractable power cord extends through the core of the extendable tubular sections to a motor mounted at the distal end of the outermost telescoping tubular section. The motor is encased within a waterproof enclosure and the shaft of the motor turns concentrically with the axis of the extendable tubular shafts. Gears and belt driving means connect the motor to a transverse shaft rotating a circular cutting blade on an axis perpendicular to the axis of the extendable tubes. The blade is provided with a pair of fan-like shields spring biased to substantially enclose the blade when it is not actively cutting, but which retract to expose the blade when slight pressure is applied thereto when the tool is in use.

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 guard apparatus for covering the cutting edge of a circular blade of a radial power saw includes a pivoting guard member extending over a portion of the cutting edge of the blade, mounted to rotate essentially coaxially with the blade, and a fluid driven cylinder and piston mechanism connected to the pivoting guard member for automatically rotating the pivoting guard member to an open position to expose the cutting edge of the blade to a work piece to make a cut and to a closed position upon completion of the cut. The guard apparatus preferably includes an electric circuit and valves for controlling the flow of the fluid into the cylinder and piston mechanism to cause the cylinder and piston mechanism to rotate the pivoting guard member to a closed position upon completion of a cut, a switch mechanism for operating the electric circuit, and a cam portion protruding from the pivoting guard member for bearing against and activating the switch mechanism.

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 chop saw comprising a base table (1, 3), a pivot block (11) attached to the base table (3), a pivot member (21) mounted on the pivot block (11) for relative motion therebetween and a saw blade (15) mounted on the pivot member (21) for movement towards and away from the base table (1, 3) to cut a workpiece positioned on the base table (1, 3), wherein a dust extraction passage (74, 75, 76) for enabling a suction apparatus to extract dust from the base table (1, 3) passes through the pivot block (11) and the pivot member (21). Such an arrangement is neat and compact, and yet provides an efficient dust removal facility.

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 portable, circular saw is disclosed. It includes a saw blade selectively rotatable about an axis of rotation to a define a working plane normal to such axis of rotation. The saw also includes an arcuate outer guard fixedly mounted about one side of the blade, and an inner guard having a central opening concentric of the axis of rotation. The purpose of the central opening is to permit the inner guard to be rotatably mounted about an opposite side of the blade. Also attached to the inner guard is a bulbous member that includes a leading edge that is adjacent to the cutting path of blade vis-a-vis a wooden member. Such wooden member generates a force on the inner guard as the former makes contact therewith and wherein the inner guard undergoes rotation about the axis of rotation.

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 portable circular saw includes motor-and-gear case pivotally supported on a guide shoe by a rear pivot mechanism for rotation about a transverse rear pivot axis, thus allowing for selective adjustment of the blade cutting depth on the opposite side of the shoe. In such an arrangement, the depth of cut setting is increased and decreased when the motor-and-gear case is rotated relative to the shoe in respective first and second directions, while an upper pivotal blade guard, which is mounted on the motor-and-gear case for rotation about the spindle, rotates in opposite rotational directions in response to respective increases and decreases in the depth of cut setting. Cam and cam follower mechanisms are provided for maintaining the riving knife and the blade and shoe in the same relative angular orientation in a fore-and-aft cutting plane regardless of the depth of cut setting.

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 power miter box includes a power driven blade which is lowered onto a workpiece. A main switch must be actuated manually by an operator to drive the blade. A separate safety switch operates to prevent the blade from being driven until it has been lowered onto the workpiece. The safety switch is operated by relative movement occurring between two guard members which encompass the blade.

Abstract: A desk-tip type cutter fixed to a table comprises a cutter body pivotably supported on the table, a circular saw blade arranged to be rotatable about its axis, a safety cover for covering the circular saw blade and a safety cover operating mechanism for pivotally opening and closing the safety cover. The safety cover driving mechanism includes a gear having at least one tooth and a lever having at least one engaging member to engage with the gear. A spring member is disposed between the cutter body and the lever for biasing the lever in a direction separating the engaging member from the gear.

Abstract: A portable circular saw device having sawdust discharge arrangement which prevents sawducts from being discharged toward an operator. The circular saw has an upper blade guard which has one side wall and an opposite side wall, and a discharge opening is formed at the one side wall for discharging, through the discharge opening the sawdusts laterally away from the operator. For further ensuring this lateral discharge of the sawdusts, a deflector is provided at the one side wall at a position close to an upstream edge of the discharge opening. The deflector protrudes from an inner surface of the one side wall toward the opposite wall for directing the sawducts passing along the inner surface of the one side wall toward an end portion on which the sawducts are reflected and are then directed to a direction perpendicular to the moving locus of the sawdusts.

Abstract: Disclosed is a saw dust collector which can be selectively attached to or removed from the fixed blade guard of a portable circular saw which has front and rear vacuum apertures located near the front and rear blade guard openings which are in fluid communication with a single vacuum source.

Abstract: A hand held power tool, such as a circular saw, having a saw blade, grinding wheel or other tool disc and having a moveable guard member protectively covering a portion of the working surface of the tool disc, is provided with a guard retainer. The guard retainer comprises a retaining latch mounted to the tool for movement to a latching position to releasably hold the moveable guard member in a retracted position during operation of the power tool. Latch operating means are operably linked to the retaining latch to hold the retaining latch in the latching position against a biasing force. In the latching position a surface of the retaining latch engages a latch stop of the moveable guard member.

Abstract: An apparatus wherein a router assembly is mounted to a top surface of a transparent plate utilizing a forward "V" notch to guide the router and direct the router along a predetermined lineal dimension, wherein a handle is mounted longitudinally aligned relative to the transparent plate rearwardly of the router assembly, wherein the handle mounts a guide plate to a bottom surface of the transparent base plate, wherein the guide plate is defined by a predetermined width substantially equal to a predetermined diameter of a router and associated bore directed through the transparent plate.

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: 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 gasoline engine powered hand held cutting tool is disclosed, which includes a gasoline engine incorporated into the body, or frame, of the circular saw cutting tool. The engine is preferably a two-stroke engine, though, it should be emphasized, other gasoline powered engines of various shapes and sizes may be employed, as practical. The hand held circular saw cutting tool of the present invention further, preferably, includes a throttle trigger to control the engine speed, for increased efficiency, with the saw blade of the tool being connected to an engine crank shaft, preferably through a centrifugal clutch. The power tool of the present invention, in its preferred embodiment also preferably includes a plate for resting the tool of the invention on a piece of lumber intended for cutting.

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 mechanism for adjusting the angle of the base of a circular saw relative the saw blade includes an adjustment bracket having an elongated adjustment aperture which extends over both ranges of angular adjustment. For the first range, the aperture follows a first circular arc at a first radial distance from the pivot axis of the base relative the housing and for the second range the aperture follows a second circular arc at a second radial distance from the pivot axis.

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: 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 blade guard system for power driven rotary saws having a drive shaft arm rotatable between inboard and outboard cutting positions relative to the chassis, a blade guard disposed about a portion of the saw blade and rotatably attached to the saw blade shaft. An arcuate track slot is disposed on the inner wall of the blade guard adjacent to the drive shaft arm. A blade guard adjust arm is pivotally mounted at one end to the drive shaft arm and the other end of the blade guard adjust arm being releasably attachable at selected locations along the track slot to position the blade guard in desired protective positions. When the blade guard adjust arm is released from the track slot, rotation of the blade guard and the blade guard adjust arm to selected protective positions is permitted without the need to remove the blade guard or blade from the saw blade shaft.

Abstract: A portable, hand-held circular saw includes a movable lower guard having a lift handle secured to it. A prominent warning sign is secured to the lift handle, to face the operator and come into the field of vision of the operator as the lower blade guard is moved back to expose the circular saw blade.

Abstract: A saw-blade guard arrangement in a motor driven chop saw which includes a new unit pivotally mounted for movement between an upper rest position and a lower operational position. The saw unit is pivotably connected to a hinging member through a pivot shaft, and the unit includes an upper safety guard, a motor casing integral with the upper guard, a saw blade fixed to a drive shaft connected to a motor shaft, and a lower guard rotatable to a first direction for covering a part of the saw blade when the saw unit is in the upper rest position and rotatable to a second direction when the unit is moved to the lower operational position.

Abstract: An aligning mechanism for power hand saws in the preferred structure of this disclosure is connected to a saw. The saw comprises a motor, a handle, a blade, a base, and a switch to activate the motor and the blade. The mechanism includes an aligning device for aligning the saw. The aligning device and the saw move forwardly together and in unison during cutting movements of the saw. Such aligning device has an operable position and an non-operable position, such operable position being for positioning at least a portion of the aligning device below a saw base for engaging a work piece and the non-operable position being for positioning the aligning device up and away from a work piece. In one embodiment of the invention, an electrical solenoid is employed to move the aligning device, such solenoid being connected to the saw switch. Another embodiment of the invention employs a manually activated aligning device.

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: A hand held cutting tool is disclosed for use in cutting articles, especially when the tool is to be used in confined quarters while protecting the operator from being cut by the tool. The tool includes a motor which drives the cutter only when one hand of the operator grasps the motor housing and closes a trigger. Portions of a cutter and cutter guard project out of a small housing, and the guard normally encompasses the projecting portion of the cutter. When it is desired to expose the projecting portion of the cutter to perform a cutting operation, the other hand of the operator must grip a portion of the tool remote from the exposed portion of the cutter and must actuate a valve or handle to expose and maintain the guard in the exposed cutting position.

Abstract: In a hand-held circular power saw, a mechanism whereby a blocking pawl moves into the path of a projection fixed to the rotatable blade guard of the saw, preventing motion of the blade guard and protecting the operator. The blocking pawl is moved into the blocking position during the opening of the blade guard, when the projection fixed to the blade guard tangentially forces a cam-shaped surface to rotate, the cam-shaped surface thereby forcing the blocking pawl into the return path of the blade guard projection. The pawl is kept in this position by means of a spring biased arm which is forced against a toggle such that motion of the lever is prevented.

Abstract: In one embodiment of this quick change mechanism, a narrow six spline hub is installed in the arbor hole of a circular saw blade or other disc tool heads such as grinders, sanders and buffers. This hub slides onto a matching splined drive shaft in which a narrow section of spline lands has been removed circumferentially to fit the width of the splined hub that is secured to the circular saw blade. A fifteen degree rotation of this splined blade hub on this shaft aligns all the lands and grooves, thus locking the hub relative the longitudinal axis of the drive shaft. To continue the locking, by locking the hub in rotation relative to the shaft, a splined sliding collar with spline land extensions, serving as locking fingers, is interposed into the spline grooves of the drive shaft and also the hub grooves. A blind longitudinal hole in the drive shaft contains a compression spring and an unthreaded bolt.

Abstract: A locking cover assembly is disclosed which is particularly usable with a conventional chain saw wherein the assembly includes a cover extending about and surrounding the chain and bar cutting assembly of the chain saw while defining a slot extending longitudinally along the bottom edge thereof to facilitate cutting. The cover is hingedly secured with respect to the housing of the chain saw to allow the cover to swing vertically upwardly responsive to cutting movement by the cutting assembly. Wing members are included extending longitudinally along the slot to facilitate movement of the cover during cutting. A biasing spring is included for holding the cover in the down enclosed position when the cutting assembly is not in use. A locking apparatus is included which has a plurality of guide rods fixedly secured with respect to the housing and defining apertures through which a movable locking pin extends.

Abstract: A portable electric circular saw with a tiltable base plate is disclosed herein. The circular saw comprises a housing for accommodating an electric motor, a circular saw blade operatively connected to the motor to be driven thereby, a safety guard connected to the housing for enclosing the portion of the saw blade, the base plate upon which the above parts are mounted and which is adapted to engage upon the surface of a workpiece to be sawed, and a bracket for attaching the base plate to the housing. One end portion of the bracket is secured to the housing and the opposite end thereof is pivotally connected to the base plate such that the base plate can pivot about an axis within the plane of the saw blade for adjustment of the angle of the cut. The base plate joins the bracket by fastening means at the portion intermediate the ends of the bracket after the base plate is set at a desired angle with respect to the saw blade.

Abstract: A portable circular saw includes a single, one-piece thermoplastic housing having an interface portion which interchangeably mounts either a pivot adjust or vertical adjust subassembly, whereby two types of saws may be constructed using the same field case. One type adjusts saw blade depth of cut by pivotal movement of the housing relative to a reference plane. The other type adjusts saw blade depth of cut by transverse movement of the housing relative to the reference plane. The pivot adjust subassembly includes a one-piece foamed plastic auxiliary handle having an integral handgrip portion, pivot and lower guard bumper. The vertical adjust subassembly includes a one-piece rectangular rail member having an outer perimeter edge surface which guides the movement of a vertical adjust bracket. The pivot handle and the one-piece rail member, respectively, are interchangeably and snugly mounted on a common locating surface formed in the field case interface portion.

Abstract: A new and unique device for determining a correct sawing position for a portable rotary sawing machine is disclosed which has a rectangular opening or watching window provided on the front part of a stationary protective cover so that an operator clearly watches a rotary saw therethrough. An alignment is ensured for the intended correct sawing operation by watching the rotary saw, indicator gauge and scribing line on a workpiece to be sawn. The rectangular opening or watching window is removably closed with a transparent cover plate.According to other aspect of the invention the device is constructed such that the intended alignment is achieved by watching an indicator line or holes, indicator gauge and scribing line on a workpiece, said indicating line or holes being provided on the front part of the stationary protective cover in the peripheral direction.

Abstract: An electric saw or other power-operated tool carries a spring-loaded pin for selectively locking the output spindle against rotation and facilitating removal of the blade. The locking pin comprises a bent wire-formed element pivotably retained in the housing. One end of the pin is slidably received within a flanged bearing opening in the stationary guard. When the pin is pivoted by the operator, the end of the pin is received within an aperture in the inner flange washer, the latter forming part of the clamping mechanism for fixedly securing the blade on the spindle.

Abstract: A hand held portable pruning tool having a housing enclosing a motor one or more batteries and a saw blade. The saw blade is rotatable about an axis perpendicular to the axis of the housing. The blade is normally protected by a telescoping guard element having a forwardly extending notch for receiving a stem or limb to be cut. The telescoping guard element retracts into the housing in response to pressure exerted on the guard element in the direction of the stem thus bring the stem into contact with the blade and also energizing the motor.