Abstract: The present invention provides a quick dismantling and positioning structure for the saw blade of sawing machine; a n-shaped rod is defined, two guard plates and stoppers are correspondingly arranged at both sides to form a shield assembly; moreover, two moveable dampers are arranged within the rod, a quick-release bolt is externally mounted onto the front end of the moveable clamper, so that the shield assembly could be quickly dismantled or reassembled by screwing and release of the quick-release bolt.

Abstract: A preferred embodiment of the present invention is directed to a modular saw guard system for a power saw of the type which has a table top, a rotatable circular saw blade, the table top having an opening through which the saw blade can extend, the system comprising a riving knife mounted to the saw rearwardly of the blade and having a top surface and at least one aperture near the top surface, a blade guard and kickback prevention mechanism that is releasably mounted to the riving knife, the mechanism comprising a mounting channel configured to fit on and be releasably attached to the riving knife, the blade guard portion being pivotally attached to the mounting channel, the kickback prevention portion being pivotally attached to the mounting channel; and a lever mechanism for holding the mounting channel to the riving knife and for releasing the mounting channel for removal therefrom, the lever mechanism including a movable pin member for engaging the aperture of the riving knife.

Abstract: A miter saw having a securable positioning structure for a blade guard thereof includes a saw blade, a rotatable handle, a movable blade guard, a control unit, a positioning unit, and a rope. The rotatable handle is provided for the user's holding for the cutting operation. The movable blade guard is shiftable between where it covers the saw blade and where it does not cover the saw blade. The control unit is mounted to the rotatable handle. The positioning unit is provided for blocking the movement of the movable blade guard. The rope is connected with the control unit and the positioning unit. Accordingly, the user only needs to operate the control unit to drive action of the positioning unit via the rope to hold the movable blade guard in position, thus securing the safety of the operation. In addition, the rotatable handle can be turned smoothly without any barrier.

Abstract: A tool unit for a cutting device includes a rotary blade, a blade case for covering at least a part of the blade case, and a drive device mounted to the blade case for rotatably driving the rotary blade. A handle is attached to the drive device. The blade case has a front support portion. The handle has a rear support portion. When the tool unit is used for a portable cutting device, the front support portion can be vertically pivotally supported by a front portion of the base, and the rear support portion can be supported by a guide member such that a position of the rear support portion can be changed relative to the guide member for enabling adjustment of a cutting depth of the rotary blade into the workpiece. When the tool unit is used for a table cutting device, the front support portion can be vertically pivotally supported by the table.

Abstract: An enhancement for use with automatically cycled saw systems that provides an operator access to two-hand anti-tie down buttons and other machine control functions while manually crowding the material to be cut against the saw's fence.

Abstract: A cutting including a saw blade protruding from an upper surface of the table can include a splitter positioned on the front side with respect to a cutting direction of the saw blade and in alignment with the saw blade. A guard device is provided for covering the saw blade. A kickback preventing claw member prevents the workpiece from being forced upward by the saw blade after the workpiece has been cut by the saw blade. A mount frame is detachably mounted to an upper portion of the splitter. The guard device and the kickback preventing claw member are supported on the mount frame, so that the guard device and the kickback preventing claw can be removed separately or together from the splitter.

Abstract: A quick release structure for use in the saw blade guard assembly of a table saw is disclosed to include a mounting member affixed to the base of the table saw, a coupling block detachably attached to the mounting member to hold a pivoted attachment member, for example, a saw blade guard, and a rotary locking member mounted in the coupling block and rotatable relative the coupling block between two positions to lock the coupling block to the mounting member or to release the coupling block.

Abstract: A device for mounting a cover of a cutting blade to a riving knife may have an engaging member for releasably engaging at least a part of the riving knife from both sides, in a direction of thickness of the riving knife. The engaging member is manually operable without any additional tools. A device for mounting a riving knife to a table saw may include a manually operable lock member and a biasing member. The biasing member is arranged and constructed to normally bias the lock member towards a lock position. The riving knife may be divided into a first knife portion and a second knife portion. A positioning device may position the first knife portion and the second knife portion substantially within a single plate.

Abstract: Table saw blade guards, splitter assemblies, attachments, accessories, and table saws including the same. The splitter assemblies include a splitter and a blade guard that is coupled to the splitter. The blade guards include a top guard. In some embodiments, the top guard is configured to be a hold-down guard. In some embodiments, the top guard is pivotally coupled to the splitter. In some embodiments, the top guard is adjustably coupled to the splitter. In some embodiments, the top guard is secured in a fixed orientation relative to the splitter. In some embodiments, the top guard includes a portion that is secured in a fixed orientation to the splitter and a portion that is pivotal relative to the splitter.

Abstract: A quickly assembled and disassembled protective cover for a table sawing machine is pivotally assembled on a cover plate having one end secured on an assembly base of a quick disassembling device. The assembly base is bored with a positioning hole for a positioning pin to be axially inserted therein. When pushed or pulled to shift axially, the positioning pin can be inserted and positioned in or separated from a through hole of a chopper plate, and the positioning pin is fixed in position by a positioning element. By so designing, the assembly base can be quickly assembled on or disassembled from the chopper plate, achieving effect of quick assembly and disassembly of the protective cover.

Abstract: A quick release device for use in a saw to secure a guard cover to a spreader of a saw blade guard assembly. The quick release device includes a mounting block, which has a mounting groove for receiving the spreader, a pivot member pivotally mounted in the mounting block and having a non-circular shoulder received in a receiving portion of a notch on the spreader, and a lever coupled to the pivot member for rotating the pivot member to cause the shoulder of the pivot member to be locked in the receiving portion of the notch or to be movable out of the notch.

Abstract: A food product slicer with a rotatable slicer knife includes a ring guard disposed about a portion of the peripheral cutting edge of the slicer knife. A removable ring guard cover includes a food catching wall positioned in the gap between the peripheral cutting edge of the knife and the ring guard.

Abstract: The invention relates to a protective device, particularly for circular saw benches (12) with a tool (14), which is formed by a rotating, disk-shaped sawing tool, comprising at least one actuator unit (16) and at least one protective unit (18, 20). It is proposed that the actuator unit (16) is provided to displace the protective unit (18, 20) into a protective position (22) on the saw tool (14).

Abstract: A supporting device is adapted for mounting a protective cover to shield a cutting blade of a cutting machine, and includes a mount unit with a proximate tightening surface, a tightening bolt passing through the proximate tightening surface, a supporting frame adapted for holding the protective cover and having a guiding slot for passage of the tightening bolt so as to be movable between a position of use and a retreat position, a movable tightening member with a distal tightening surface and a cam follower surface, a cam actuating member having a cam surface mating with the cam follower surface and turnable to tighten or loosen the supporting frame, and a biasing member disposed to keep the actuating body in a tightening position.

Abstract: A hand-held power tool includes a housing (4), and a tag-shaped identification element (14.1; 14.2) mountable on the housing (4) so that it becomes visible on an outer side of the housing (4), provided with an identification mark (16.1; 16.2), insertable in a receptacle (20.1; 20.2) provided on the housing.

Abstract: Provided is an apparatus for lifting a retractable lower safety-guard on a circular saw. In one representative implementation, an actuator is attached to the circular saw and an elongated arm is coupled to the actuator such that operating the actuator causes the elongated arm to lift. In addition, an engagement element is attached to the retractable lower safety-guard of the circular saw. When lifted, the elongated arm engages the engagement element, thereby retracting the retractable lower safety-guard of the circular saw. Preferably, the actuator is configured, and is located sufficiently close to a power switch for the circular saw, so that the actuator can be operated simultaneously with the power switch using a single hand. Also provided are retrofitting techniques for attaching such a device to an existing circular saw.

Abstract: Herein described is a quick assembling disassembling and movement mechanism for a component of a food slicing machine (10) of the type comprising a framework (12) bearing a rotating blade (14), provided with a blade-cover (16) which extends for at least a part of the circumferential edge of the blade (14), a moveable flap (18) and guide means (20) for a carriage (22). The carriage (22) is made up of a product-bearing plate (24), a support arm (26), constrained in a sliding manner against the guide means (20), and a cover-plate (28) sliding over the product-bearing plate (24) in an orthogonal direction with respect to the moveable flap (18).

Abstract: An undercut saw including a housing, a motor within said housing, a drive shaft rotated by said motor, and a blade mount mechanically linked to said shaft such that a circular saw blade mounted on said mount is rotated when the motor rotates the drive shaft. A fixed blade guard circumscribes a portion of the blade and allows selectable height adjustment of the blade. A stabilization bar on the fixed blade guard may be extended to make the device more stable. On the underside of the fixed blade guard a dust channel allows dust to be swept by the rotating blade into a dust port. The dust channel allows positioning of the dust port away from the leading edges of the fixed blade guard.

Abstract: A preferred embodiment of the present invention is directed to a modular saw guard system for a power saw of the type which has a table top, a rotatable circular saw blade that is vertically adjustable relative to the table top, the table top having an opening through which the saw blade can extend, the blade being configured to cut a work piece as the work piece is moved forwardly from a forward position to a rearward position, wherein the system comprises a riving knife mechanism releasably mounted to the saw rearwardly of the blade, a blade guard mechanism that is releasably mounted to the riving knife mechanism when the riving knife mechanism is at least in its extended position, and a kickback prevention mechanism that is releasably mounted to the riving knife mechanism.

Abstract: A circular cutter comprises a circular blade mounted to a front end of a handle via a shaft assembly, in the handle is disposed a slide member for controlling a hood having a T-shaped hole, the T-shaped hole is located correspondingly to a center of the circular blade and arranged outside of the shaft assembly, when the hood draws back under the control of the slide member, a surface of an object to be cut will press against the hood, so as to make the shaft assembly deviate left or right freely within the T-shaped hole, and therefore, both a left hand user and a right hand user can use the same circular cutter.

Abstract: A quickly collapsible protective cover unit for a table sawing machine includes two protective covers, two connecting rods, an elongate base and a dividing plate. The dividing plate has its upper end combined between two lengthwise sides of one end portion of the base, provided with plural slots for a fitting rod of plural fixing blocks located at one end portion of the base to fit therein. The slots respectively have a stop edge for retaining the fitting rod therein, not to loosen out of the slots when the fitting rods are pushed in the slots. Then the compress bolt and the fitting rods can tightly force the base and the dividing plate combined with each other. So the protective cover unit can be assembled or collapsed quickly, without using any tool, by handling the compress bolt.

Abstract: Table saws with splitters and blade shrouds are disclosed. The blade shrouds may be configured so that a forward portion of the splitter stabilizes a back portion of the blade shroud against side-to-side movement of the back portion of the blade shroud. The blade shroud may include a slot and the splitter may stabilize the blade shroud by fitting into the slot.

Abstract: A saw blade protecting plate of a table sawing machine is firmly covered on the work table of a table sawing machine and positioned at a corresponding location of a saw blade. The saw blade protecting plate is composed of a support plate and a covering plate. The support plate made of metal has its surface bored with a lengthwise notch preset in length and width. The covering plate made of plastic is completely covered and bonded on the support plate and covers up the notch between the saw blade and the support plate. Therefore, the saw blade is inserted and fixed in the saw blade protecting plate without leaving gap between them, thus insuring safety in a sawing process.

Abstract: An electric cutting tool useful for bevel cutting, the tool having a base adapted to contact a workpiece, a saw unit supported on the base, and a handle mounted on a guard of the saw unit. The saw unit includes a guard, a saw blade disposed within the guard, and a driving motor portion coupled to the saw blade via a transmission mechanism. The driving motor portion includes at least two driving motors, and the output shafts of which are coupled to an input portion of the transmission mechanism. An output portion of the transmission mechanism is coupled to a shaft of the saw blade.

Abstract: A locking device for a rotary wheel of a table saw includes a rotary shaft and a rotary wheel connected with a rear end of the rotary shaft. The shaft has a threaded end at its utmost rear end and a pivotally fitting section connected with the threaded end. A squeezing sleeve engaged with the rotary shaft is installed outside the table saw. The rotary wheel has a fixing hole for fixing with the pivotally fitting section, and a positioning knob located outside the rotary shaft for screwing with the threaded end so as to move axially to push the rotary wheel to squeeze the squeezing sleeve to keep the rotary wheel positioned immovably.

Abstract: A woodworking machine is disclosed. The machine includes a cutting tool and a motor adapted to drive the cutting tool. The machine further includes a detection system to detect a dangerous condition between the cutting tool and a person, such as a person coming into contact with the cutting tool. A reaction system is provided to disable the cutting tool, such as by covering, blocking, destroying, wrapping, etc., upon detection by the detection system of the dangerous condition.

Abstract: A miter saw is disclosed having a base, a blade supported by the base, a detection system adapted to detect a dangerous condition between a person and the blade, and a reaction system associated with the detection system to cause a predetermined action to take place upon detection of the dangerous condition. The blade is rotatable, and moves into a cutting zone to cut a workpiece. The predetermined action may be to stop the blade from rotating, to create an impulse against movement of the blade into the cutting zone, or to cause the blade to move away from the cutting zone.

Abstract: A miter saw is disclosed having a base, a blade supported by the base, a detection system adapted to detect a dangerous condition between a person and the blade, and a reaction system associated with the detection system to cause a predetermined action to take place upon detection of the dangerous condition. The blade is rotatable, and moves into a cutting zone to cut a workpiece. The predetermined action may be to stop the blade from rotating, to create an impulse against movement of the blade into the cutting zone, or to cause the blade to move away from the cutting zone.

Abstract: A quickly collapsible protective cover unit for a table sawing machine includes two protective covers, two connecting rods, an elongate base and a dividing plate. The dividing plate has its upper end combined between two lengthwise sides of one end portion of the base, provided with plural slots for a fitting rod of plural fixing blocks located at one end portion of the base to fit therein. The slots respectively have a stop edge for retaining the fitting rod therein, not to loosen out of the slots when the fitting rods are pushed in the slots. Then the compress bolt and the fitting rods can tightly force the base and the dividing plate combined with each other. So the protective cover unit can be assembled or collapsed quickly, without using any tool, by handling the compress bolt.

Abstract: A protective cover device includes a supporting member secured to a worktable of a sawing machine, a cantilever having rear and front pivot ends pivoted to the supporting member and a cover shield by rear and front journal pins, respectively. At least one of the rear and front journal pins is movable relative to a corresponding one of the rear and front pivot ends between a latched position, where a respective one of the rear and front journal pins pivotally secures a corresponding one of the rear and front pivot ends to a corresponding one of the supporting member and the cover shield, and a released position, where the respective one of the rear and front journal pins is clear of the corresponding one of the supporting member and the front pivot end by being withdrawn therefrom.

Abstract: A food slicer has a housing with a first push-button for actuating an electric switch for operating the cutting blade and a second push-button, i.e., a safety button, locking the first push-button against actuation. The second push-button actuates a mechanical lock which can be engaged and disengaged, blocking the first push-button in an inserted position of the lock, thereby preventing actuation of the electric switch that triggers an electric motor drive used to actuate a circular cutting blade. The first push-button is formed with a stop surface for the lock on which the lock is arranged, when it is in an inserted position, either at or in close vicinity of an axis extending through the center of the push-button surface, pointing in the direction of actuation, and on which the lock engages in an inserted position.

Abstract: A circular cutter comprising a circular blade mounted to a front end of a handle via a shaft assembly, in the handle is disposed a slide member for controlling a hood, the hood is formed with a T-shaped hole located correspondingly to a center of the circular blade and is defined with an arc gap located in a cutting direction of the circular cutter, the T-shaped hole is arranged at both sides of the circular blade and located outside of the shaft assembly, when the hood draws back under the control of the slide member, a surface of an object to be cut will press against the hood, so as to make the shaft assembly deviate within the T-shaped hole, and therefore, both a left hand user and a right hand user can use the same circular cutter.

Abstract: The present invention discloses a guard assembly for a saw blade, which comprises an inner guard portion and an outer guard portion. The inner and outer guard portions define a containing space therebetween. A circular saw blade includes two parallel sides and a rotating axis perpendicular to the two sides. At least a portion of the saw blade is located within the containing space. The outer guard portion is pivotally connected with the inner guard portion about a pivotal axis which is substantially parallel to each side of the blade. The improved guard assembly, which can be opened laterally, is convenient to change the saw blade and to clean the inner of the guard.

Abstract: A table saw (10) includes a table top (16) over which a saw blade (20) is positioned. The upper region is covered by a guard (26) which is height-adjustable relative to the saw blade (20) in particular, and the saw blade (20) is angularly-displaceable relative to the table top (16). A gap (32) is located between the guard (26) and the table top (16). The table saw is made safer to handle by the fact that the guard (26) includes a protective panel (36) which is movably supported relative to the guard (26) and closes the gap (32) in a manner such that it cannot be penetrated by the operator's fingers.

Abstract: A protective cover for a cutting wheel of a hand-held cut-off machine driven by an internal combustion engine has a circumferential wall and two opposed sidewalls adjoining the circumferential wall. The circumferential wall and the two sidewalls are a monolithic component made of cast light metal. The circumferential wall in a circumferential direction has at least over sections thereof a first integral thicker portion. The two sidewalls are thinner than the first integral thicker portion. Preferably, the protective cover is made of diecast magnesium.

Abstract: The present invention is directed to a blade guard assembly capable of allowing increased capacity for saws, such as radial arm saw, miter saws, and the like. The assembly includes a U-shaped guard and a pivot pin for allowing the guard to obtain a plurality of positions including a guarding orientation and a cutting orientation. The guard may pivot so as to allow a larger dimension workpiece to be cut without exposing the saw blade unnecessarily. Additionally, a biasing device may be included for generally forcing the guard into a guarding orientation.

Abstract: A radial arm saw is adapted with a safety top configured with cutting box enclosure that contains and collects substantially all of the sawdust generated during use. A dust collection system is in fluid communication with the cutting box for removing the sawdust contained therein. Spring biased push blocks function to hold the work piece in place during the sawing process while maintaining the user's hands safely away from the saw blade. A laser alignment device projects a beam within the cutting box along the cutting plane. A control panel is provided to allow use by authorized users upon entry of an authorization code.

Abstract: A miter saw includes a base, a table rotatably attached to the base, a support housing connected to the table, a saw assembly connected to the support housing, the saw assembly comprising a pivot arm, an upper blade guard connected to the pivot arm, a motor attached to the upper blade guard, and a blade driven by the motor, and a dust collector having a main body, wherein at least one slot is disposed on the main body.

Abstract: The quickly-detachable protective cover unit of a table sawing machine includes a protective cover, a non-return plate, a protective plate, a combining plate and an extending plate. The extending plate positioned at one side of the saw blade of a table sawing machine has its inner end fixed with a quickly-detachable handle unit for positioning the combining plate thereon. The protective plate is inserted through the saw blade and the combining plate, positioned on the table-sawing machine. The non-return plate and the protective cover are respectively provided with a quickly detachable device to fit in the positioning hole of the combining plate. The components of the quickly detachable protective cover unit are combined by quickly detachable mechanism so they can be disassembled or assembled quickly, needing no tool for carrying out disassembling work.

Abstract: The present invention relates to a power miter saw with a quick actuating mechanism for a movable guard. The mechanism comprises a mounting arm, a fixed guard, a drive means and a circular saw blade. A movable guard is pivotally connected to the fixed guard. The movable guard is pivotally connected to the front end of the actuating link by a second guiding member. The rear end of the actuating link is movably connected to the mounting arm. A first guiding member is disposed on the rear end of the actuating link and the mounting arm has a first arcuate slide slot with which the first guiding member engages. When the fixed guard moves together with the saw unit downwardly, the actuating link pivotally engages the first slide slot and actuates the movable guard rapidly to open. The movable guard of the present invention can be easily manufactured and conveniently assembled or adjusted so as to reduce the cost.

Abstract: A circular saw includes a worktable, a blade supporting unit pivotally mounted to the worktable, a saw blade shaft mounted rotatably on the supporting unit and driven by a motor to rotate a saw blade, a driving shaft mounted rotatably on the supporting unit, and a dust collecting member confining a dust passageway which has an intake port in the vicinity of the saw blade, and an outlet port for passage of wood dust. A blower casing is disposed outwardly of the supporting unit, and defines an accommodation chamber disposed downstream of the outlet port and receiving a driving end of the driving shaft. An impeller is mounted on the driving end and is rotatable so as to draw wood dust from the dust passageway into the accommodation chamber and out through a discharge port.

Abstract: A radial arm saw is adapted with a safety top configured with cutting box enclosure that contains and collects substantially all of the sawdust generated during use. A dust collection system is in fluid communication with the cutting box for removing the sawdust contained therein. Spring biased push blocks function to hold the work piece in place during the sawing process while maintaining the user's hands safely away from the saw blade. A laser alignment device projects a beam within the cutting box along the cutting plane. A control panel is provided to allow use by authorized users upon entry of an authorization code.

Abstract: A saw guard system for enhancing the safety of use of powered hand saws by eliminating the need to hold the blade guard in a static position during the cutting operation. The saw guard system includes a circular saw with a housing, a motor positioned within the housing, a shaft extending from the motor through a wall of the housing, a blade operationally coupled to the shaft, and an upper blade guard for covering a perimeter edge of the blade above the shaft; a lower guard member pivotally coupled to the housing, a guard member motor coupled to the housing and the lower guard member for moving the lower guard member from the deployed position to the stored position; the guard member motor is operable separately from the motor of the circular saw; and a gear assembly operationally coupling the guard member motor to the lower guard member.

Abstract: A portable grinding machine (10) includes an elongated housing (12, 14) and an output shaft (16) projecting at a right angle to the housing axis for receiving a disk-shaped rotary clamping tool. The output shaft is encompassed by a substantially cylindrical clamping collar (30), on which a shell-like protective cover (20) is secured in a tensile manner against rotation and axial displacement and which serves for encompassing the clamping tool (18) and which can be attached on the clamping collar (30) with a ring-shaped tensioning belt (28). The tensioning belt (28) has sharp-edged projections (32) projecting to the clamping collar, which upon clamping, born into the clamping collar and are held there in a form-locking manner (a shell-like tensioning band).

Abstract: A sawdust collection hood for a table saw. The hood has an identical pair of vertical, spaced-apart side panels, an upper cowl mounted between the side panels, a canted nose panel mounted between front portions of the side panels, and a lower cowl that extends rearwardly between the side panels below the upper cowl from a forward edge of the lower cowl disposed over a trailing edge of the nose panel. A pair of side skirts suspended from each of the side panels, extend rearwardly from the nose panel, and are movable between a raised and a lowered position. When placed upon the saw work table, straddling the saw blade, and with side skirts lowered, a work piece moved rearward against the canted nose panel causes the hood to rise.

Abstract: A saw including a base, a trunnion pivotally attached to the base, a pivot arm pivotally attached to the trunnion, a saw assembly supported by the pivot arm, the saw assembly including a motor, a blade driven by the motor, an upper blade guard for covering an upper part of the blade, and at least one of a lower blade guard pivotally attached to the upper blade guard for covering a lower part of the blade and a rear blade guard attached to the upper blade guard, and a fence assembly comprising a fixed fence attached to the base, and a movable fence movably attached to the fixed fence, wherein the movable fence has a stepped portion for limiting lateral movement of the at least one of the lower blade guard and the rear blade guard.

Abstract: A guard assembly for a saw or other cutting device includes fixed and movable guards relatively pivotal by way of a linkage assembly having two links pivotally interconnected coaxially with a cam roller engageable with a cam surface for controlling relative guard movement. Other preferred features include a torsional coil guard return spring and spring enclosure that minimizes interference with workpiece cutting depth, an arbor shaft cover retention fastener that doubles, along with another caliper member, as a blade caliper set that prevents guard damage in the event of a bent or deflected blade or cutter, a drive assembly hold-down assembly for storage, and a horizontally-extending handle centered horizontally relative to the blade or cutter.

Abstract: A guard device for a hand power tool, in the form of a sanding/grinding hand power tool, has a wheel guard enclosing at least part of a rotating tool in a radial direction; a guide for guiding the wheel guard along a work piece, and comprising a fastening device for mounting the wheel guard on the hand power tool, wherein the guide is joined with the wheel guard in torsion-resistant fashion, and the wheel guard is mounted in a fashion that allows it to move relative to the fastening device; and a depth-of-cut stop limiting the relative movement of the wheel guard and fastening device, and being lockable in position with positive engagement in preselected stepped positions.

Abstract: A woodworking machine is disclosed. The machine includes a cutting tool and a motor adapted to drive the cutting tool. The machine further includes a detection system to detect a dangerous condition between the cutting tool and a person, such as a person coming into contact with the cutting tool. A reaction system is provided to disable the cutting tool, such as by covering, blocking, destroying, wrapping, etc., upon detection by the detection system of the dangerous condition.

Abstract: A circular saw includes a base member abutting a supporting surface and an operating arm pivotally mounted to the base member. A gearbox is formed on a free end of the operating arm. The gearbox includes a first cavity and a second cavity respectively laterally defined in two opposite side of the gearbox. A hole is laterally defined in a bottom of the first cavity and communicates with the second cavity. A handle extends from the gearbox for user to easily operate the circular saw. A motor is laterally securely mounted to the bottom of the first cavity and partially received in the first cavity in the gearbox. A blade device is laterally mounted to the second side of the gearbox and connected to the motor so that the blade device is driven when the motor is operated.