Abstract: A cutting assembly for a rock excavation machine having a frame includes a boom and a cutting device supported on the boom. The boom includes a first portion and a second portion, the first portion supported for pivotable movement relative to the frame. In some embodiments, the first portion includes a first structure extending along a longitudinal base axis and a second structure moveable relative to the first portion in a direction parallel to the longitudinal base axis, and at least one bearing supports the second portion for movement relative to the first portion. In some embodiments, the second portion is pivotably coupled to the first portion by a universal joint, and a suspension system including a plurality of biasing members may be coupled between the first portion and the second portion.

Abstract: The present invention relates to a system and method for cutting and manipulating the used wind turbine blades for disposal.

Abstract: A ground milling machine, in particular a soil stabilizer or a recycler, comprising a machine frame carried by front and rear traveling devices, a drive engine arranged on the machine frame, a ground milling device with a milling rotor supported for rotation about a horizontal rotation axis extending transversely to the working direction of the ground milling machine, said milling rotor having a plurality of ground processing tools, and with a milling rotor housing having an interior space which is open in the downward direction towards the underlying ground and in which the milling rotor is arranged, said milling rotor being height-adjustable via a milling depth adjusting device having a drive, and said milling rotor housing being connected to the machine frame via a housing support device. The invention further relates to a method for operating a ground milling machine.

Abstract: A tile saw including a saw unit having a motor and a saw blade, and a base supporting the saw unit above the base, where the base is fixed relative to the saw unit. A carriage is supported by the base. The carriage is translatable relative to the base and the saw unit, where the carriage is translatable along a first plane. The tile saw further includes a table for supporting a work piece to be cut by the saw blade. The table is translatable relative to the base and the saw unit, where the table is translatable along a second plane. The second plane is parallel to the first plane. The table is selectively translatable relative to the carriage.

Abstract: A blade sharpening system may include a sharpening tool for sharpening a workpiece. The system may also include a sharpening fixture having a mounting surface for mounting a workpiece to be sharpened by the sharpening tool. The mounting surface may be disposed on a sled that is movable along a sharpening path that passes under a sharpening implement that may be mounted to a movable arm of the sharpening tool when the arm is in an engaged position. The movement of the sled may be coupled to the movement of the arm such that moving the arm from a disengaged position to the engaged position initiates the sled to move in a first direction along the sharpening path and moving the arm from the engaged position to the disengaged position initiates the sled to move along the sharpening path in a second direction.

Abstract: An electricity supply tool holder for a machining center is provided, and has: a holder body, a stationary coil portion, a rotating coil portion, a lateral fixing portion, and an electrical machinery. The stationary coil portion is provided with a primary coil therein; the rotating coil portion is correspondingly provided with a secondary coil therein; and the lateral fixing portion is fixed on a side of the stationary coil portion used for removably combining with a machining center. When the tool holder is rotated, an external electric power/signal can be transmitted through the lateral fixing portion to the primary coil, then inducing the secondary coil, then the electric power/signal is transmitted to the electrical machinery. Additionally, the lateral fixing portion can be switched into a locked position to temporarily limit rotation, so that it can be used in a machining center of an Automatic Tool Changing (ATC) system.

Abstract: A blade sharpening system may include a sharpening tool for sharpening a workpiece. The system may also include a sharpening fixture having a mounting surface for mounting a workpiece to be sharpened by the sharpening tool. The mounting surface may be disposed on a sled that is movable along a sharpening path that passes under a sharpening implement that may be mounted to a movable arm of the sharpening tool when the arm is in an engaged position. The movement of the sled may be coupled to the movement of the arm such that moving the arm from a disengaged position to the engaged position initiates the sled to move in a first direction along the sharpening path and moving the arm from the engaged position to the disengaged position initiates the sled to move along the sharpening path in a second direction.

Abstract: A tile or masonry saw assembly may include a saw, a frame, and a workpiece support. The saw includes a motor operable to turn a blade assembly to cut a workpiece. The frame is operably coupled to the saw to enable the saw to be moved along the frame in a first direction. The workpiece support is operably coupled to the frame to support the workpiece relative to the saw, and to allow the workpiece support to be moved along the frame. The saw assembly further includes a movement assembly via which both movement of the workpiece support and movement of the saw relative to the frame is accomplished, such that a movement of the work piece support along the frame in a second direction is enabled to cause the saw to move along the frame in the first direction which is opposite the second direction.

Abstract: A battery operated concrete saw system (10) includes an electric saw (12) and a lithium based battery pack (58) including a plurality of batteries (60) connected in series to power the saw with at least 80 volts.

Abstract: A tile saw includes a base, a frame assembly disposed on the base, a first rail disposed on the frame assembly, the first rail having a longitudinal axis. A table is slidingly disposed on the first rail and a support assembly is disposed on the base. A saw assembly is supported by the support assembly and includes a motor, and a cutting wheel driven by the motor. The saw assembly is pivotable about a bevel axis substantially parallel to the longitudinal axis between two pivoted positions and is lockable in at least one of the two pivoted positions. The bevel axis is not coplanar with the upper surface.

Abstract: A saw apparatus for sawing paving slabs has a frame mounted on a ground contacting propulsion member such that the frame may move above a slab to be cut without touching the slab. A first saw support assembly disposes a blade of a saw in cutting engagement with the slab for a transverse cut. A second saw support assembly disposes a blade of another saw in cutting engagement with the slab for a longitudinal cut. The saws are mounted on the saw assemblies and the saw assemblies are mounted on the frame and the frame is mounted on the ground contact propulsion members such that no part of said frame need contact the slab during cutting.

Abstract: A supply device for a handheld power tool for a cutting grinder includes a cutting tool and a protective cover which at least partially surrounds the cutting tool. The supply device includes a U-shaped element which can be arranged on the protective cover and via which a fluid medium can be supplied to the cutting tool. The U-shaped element has a connection piece on which a coupling element can be arranged. On the coupling element a pipeline can be connected via which the fluid medium can be supplied to the U-shaped element through the connection piece. The coupling element can be turned about the axis of rotation of the connection pieces.

Abstract: Disclosed is a movable cutting tool apparatus and/or methods for cutting workpieces; either generally including a cutting tool apparatus having a cutting tool unit support apparatus including at least a substantially stationary support structure and one or more rear-mount glide rails; a cutting tool unit which is supported by the support apparatus; a cutting implement held by the cutting tool unit, whereby the cutting tool unit operates and controls the cutting implement; and, at least one fluid coolant and/or lubricant tube connected to the cutting tool unit and adapted to flow a fluid to the cutting implement in operation; wherein the cutting tool unit and the cutting implement are directly movable with the glide rails to provide reciprocal and translational movability for the cutting tool unit and the cutting implement.

Abstract: A supporting and stabilizing shoe used with a masonry circular power saw. A shoe frame rigidly mounts to the saw's motor frame. A plate that is preferably substantially planar and bifurcated to form two substantially co-planar members with a gap therebetween pivotably mounts to the shoe frame. A spring biases the plate away from the blade, but can be overcome, and an adjustment knob tightens the plate in position relative to the blade. This provides for depth adjustment for the blade and keeps the blade at a desired angle, such as ninety degrees, to the workpiece surface. The plate extends longitudinally from the motor frame beneath the drive mechanism and the blade of the saw to provide a stable surface upon which the saw can rest during use or storage.

Abstract: A chop saw, grinding wheel, or like apparatus is disclosed herein also incorporated to an easily portable dust collection system. In a preferred embodiment, a worktable is provided with a center slot for receiving a circular saw blade. A negative pressure and resulting air flow is provided at the center slot to capture particulate matter as a byproduct of cutting the workpiece. Side slots are also disclosed to assist in particulate collection. A unique filter chamber having a cylindrical filter is additionally provided to remove dust from air and discharge the filtered air at a lateral side of the apparatus. A filter cleaning knob is additionally disclosed to assist in cleaning the filter. Of the beneficial aspects of the chop saw with dust collection system is its portability being one integral unit and the dust filter being easily cleaned and maintained.

Abstract: A saw (1) being portable and/or wheeled, such as a wall saw, floor saw or masonry saw, comprising a rotatable circular saw blade (3), a drive motor (5) with an motor output shaft (9) for rotating the saw blade (3), and a transmission (20) for interconnecting the motor output shaft (9) to the rotatable saw blade (3) in order to change an unsuitable high speed and low torque combination of the motor output shaft (9) into a more useable lower speed and higher torque combination at the rotatable tool (3), wherein the transmission (20) comprises two adjustable friction saw protective clutches in parallel, which can be set at a desired predetermined value, so as to limit the maximum size of the forces that the teeth and gears of the transmission (20) are exposed to. No over dimensioning is necessary, and the transmission (20) will make out fine in rough environments. The transmission may be of single-speed or two-speed type.

Abstract: A battery operated concrete saw system (10) includes an electric saw (12) and a lithium based battery pack (58) including a plurality of batteries (60) connected in series to power the saw with at least 80 volts.

Abstract: A cutting apparatus has a main body including a body frame, wheels, a motor and a blade; a blade cover; and a slide guide. A cutting depth of the blade is adjustable. A blade cover casing entirely covers the blade. A slider having left and right linear portions is attached to a rear surface of the casing. The slide guide has circular-arc portions and flaps for sandwiching the linear portions of the slider. A gap is formed between the flaps and a side surface of the body frame. By sandwiching the linear portions of the slider between a flap and the body frame, and sandwiching the circular-arc portions between the left and right linear portions, the blade cover can slide in the up-down direction with respect to the slide guide and the body frame and can rotate about the circular-arc portions.

Abstract: A battery operated concrete saw system (10) includes an alternating current electric saw (12) and a lithium based battery pack (58) including a plurality of batteries (60) connected in series to power the saw through an inverter (70) that changes the direct current from the battery pack to alternating current that powers the saw.

Abstract: A battery operated concrete saw system (10) includes an alternating current electric saw (12) and a lithium based battery pack (58) including a plurality of batteries (60) connected in series to power the saw through an inverter (70) that changes the direct current from the battery pack to alternating current that powers the saw.

Abstract: A cutting or sawing machine (1) comprising a machine body (3), at least one disc shaped, rotatable tool (16a, 16b), an elongated tool carrier (14) having the substantial shape of a flat bar having a front end and a rear end, two opposite broad sides and two opposite edge sides, said rear end being connected to the machine body. The tool carrier comprises at least two elongated side walls (24, 25), a first elongated side wall (24) on one broad side of the tool carrier, a second elongated side wall (25) on the opposite broad side, said first and second side walls being essentially parallel with each other, and the front part of either one of the side walls or of a possible central elongated member (25) between the first and second side walls is provided with a bearing hole (28a) intended to carry a bearing of sliding contact type or of rolling contact type, i.e.

Abstract: A battery operated concrete saw system (10) includes an electric saw (12) and a battery pack cart (14) as well as an electrical cord (62) for facilitating cutting in small places with a battery pack cart at a remote location.

Abstract: A green concrete saw that allows for precise adjustment of a height of a circular saw blade is provided. The saw provides for the circular saw blade to be secured to a front end of a mainframe mounted on an undercarriage. A major height adjustment is performed by adjusting the height of the mainframe relative to the undercarriage. Further, the undercarriage supports wheels for the saw, and a fine height adjustment is performed by adjusting the height of a front end of the undercarriage relative to the ground through the use of an eccentric front axle.

Abstract: A saw (1) being portable and/or wheeled, such as a wall saw, floor saw or masonry saw, comprising a rotatable circular saw blade (3), a drive motor (5) with an motor output shaft (9) for rotating the saw blade (3), and a transmission (20) for interconnecting the motor output shaft (9) to the rotatable saw blade (3) in order to change an unsuitable high speed and low torque combination of the motor output shaft (9) into a more useable lower speed and higher torque combination at the rotatable tool (3), wherein the transmission (20) comprises two adjustable friction saw protective clutches in parallel, which can be set at a desired predetermined value, so as to limit the maximum size of the forces that the teeth and gears of the transmission (20) are exposed to. No over dimensioning is necessary, and the transmission (20) will make out fine in rough environments. The transmission may be of single-speed or two-speed type.

Abstract: A tile cutting table device featuring a platform with foldable legs; four side panels pivotally attached to side edges of the platform, the side panels can pivot between a down position and an up position forming an enclosure around the top surface of the platform; a water inlet hole for fluidly connecting a water source to the device; a drainage hole disposed in the platform; a perforated tile cutting plate disposed on the top surface of the platform; a clamp bar positioned over the tile cutting plate, the clamp bar functions to clamp down on a tile to hold the tile in place during cutting procedures, the clamp bar is connected to a foot pedal which functions to move the clamp bar between an up position and a down position, wherein the clamp bar is biased in the up position caused by compression springs.

Abstract: A rotatable cutting tool unit of a tool assembly for a cutting machine that is used in conjunction with an associated method of cutting provides several novel aspects. The tool arrangement, which includes two tool units, includes first and second disk-shaped tools rotatable about an axis. The tools define maximum tool arrangement boundaries along the axis. A driving arrangement, at an axial location between the first and second tools, supports the first and second tools for rotation and transfers driving force. A radially outer periphery of the driving arrangement is at a radius less than a radius of a peripheral cutting edge portion of the first tool and less than a radius of a peripheral cutting edge portion of the second tool.

Abstract: An attachment for an existing commercial concrete saw to convert the vertically cutting saw to a horizontally cutting saw. The saw's vertically oriented saw blade and associated horizontal shaft are first removed and the attachment is installed on the saw. The attachment has a gear box with pulley for receiving power from a pulley on the saw via a drive belt that extends around both pulleys. The gear box has a drive shaft extending vertically downward out of the gear box. Either a horizontal saw blade or cup brush can be removably attached to the drive shaft so that the saw can be used for making horizontal cuts in concrete or alternately the cup brush can be used to remove striping off the surface of a road. The gear box and the horizontal saw blade or cup brush are water cooled and lubricated.

Abstract: A thin veneer stone saw and related methods are provided. The thin veneer stone saw includes one or more circular saw blades. In an embodiment, two circular saw blades are arranged such that a masonry block, such as stone, may be sawed completely through in a single pass through the thin veneer stone saw. The stone may be delivered to, and processed through, the circular saw blades by a conveyor system. One of the circular saw blades may be centered below the top surface of the conveyor and protrude through a gap between two sections of the conveyor system. The other circular saw blade may be positioned entirely above the top surface of the conveyor system. The thin veneer stone saw may be operable to produce thin veneer stones in a variety of widths. The thin veneer stones may be used to form facade for a structure.

Abstract: A cutting and dust collecting assembly comprises a rotatable, circular saw blade (4) having a first side (20), a second side (21), and a cover device (6) with a terminal member (52). The bottom surface (36) of the cover device extends in a plane. A longitudinal passage (45, 46) for the saw blade extends through the cover device from its top surface to its bottom surface. The terminal member comprises a terminal chamber (60) having an inlet (45a), the mouth of which coincides with the plane of said bottom surface. An outlet (58) can be connected to a vacuum source. The direction of rotation of the operating blade is such that the rear part (4a) of the saw blade which has passed beyond the bottom surface of the cover device will move in a direction upwards-rearwards towards the bottom surface. The invention also concerns the cover device, a sealing body belonging to the cover device and a working machine which is provided with the cutting and dust collecting assembly.

Abstract: A battery operated concrete saw system (10) includes an electric saw (12) and a battery pack cart (14) as well as an electrical cord (62) for facilitating cutting in small places with a battery pack cart at a remote location.

Abstract: A cutting implement configured to be attached to an implement carrier of a power machine. The cutting implement includes an attachment structure that is capable of engaging and being secured to the implement carrier. The cutting implement further includes a boom having a distal end and a proximal end. The proximal end is attached to the attachment structure. A trolley is selectively positionable between the proximal end and the distal end of the boom. An undercarriage is operably coupled to the trolley and has a cutting element attached to it. The undercarriage is moveable under power in a lateral direction with respect to the trolley so that the cutting element is capable of being offset along a lateral direction with respect to the boom.

Abstract: A concrete saw (10) has an electric motor (24) energized by a battery pack (34) to drive a pair of saw arbors (42) and a battery powered transmission (30) drives rear wheels (16) that provide self propulsion of the saw in cooperation with front wheels (20). A power operated actuator (54) raises and lowers the front wheels (20) to provide upward and downward movement of the saw frame (14) about its rear wheels (16). The battery pack (34) may be lead acid batteries, nickel-cadmium batteries, nickel metal hydride batteries or lithium batteries, and the electric motor (24) has 5 to 15 horsepower, preferably about 10 horsepower, to provide cutting of most conventional concrete jobs.

Abstract: A guide cart for a hand-held power tool with a driven tool has a pivot device that is pivotable between an open position and a fixation position. A fixation elements is provided that releasably secures the power tool on the guide cart. The fixation element is secured on the pivot device. The pivot device has at least one support for supporting a tool of the power tool in the fixation position of the pivot device. The guide cart has a holder for the power tool, wherein holder is provided with a base plate and has at least one lateral guide for the power tool. The pivot device is supported on the base plate. The pivot device and the baseplate together form a C-shaped frame.

Abstract: A bimodal tile saw includes a tray supported on a base extending in a first direction and a water-cooled saw unit suspended from a telescoping arm. Both the tray and the saw unit move relative to the base along the first direction. In a first mode, the saw unit is fixed and the substrate is fed to the saw unit by advancing the tray. In a second mode, the table is fixed and the telescoping arm is advanced using ergonomic handles to bring the blade into contact with the substrate. A laser cutting guide casts a precise beam across the work piece for accurate cutting. An integrated handtruck, having a handle and folding legs actuated by gas pistons allows easy transport and setup of the tile saw. During use, a retractable foot elevates the wheels off of the ground. Water shields protect the saw unit's motor and external environment.

Abstract: An adjustable handle assembly for a road surface cutting saw is provided that includes a back plate attached to the saw housing, an outer gear attached to the back plate, a bracket assembly including an inner gear, a tubular member slidably attached to the bracket assembly, and an adjustment lever having a threaded engagement end. The adjustment lever secures the bracket assembly to the saw such that the inner gear engages the outer gear. When the adjustment lever is loosened a bias spring biases the bracket assembly away from the saw such that the inner gear disengages from the outer gear to thereby allow rotation of the handle assembly to a desired operating position.

Abstract: A self propelled concrete saw compensates for blade cutting resistance, for example by adjusting a movable drive assembly. An actuator may be used to move the drive assembly, for example through the operation of a control switch by an operator.

Abstract: A green concrete saw that allows for precise adjustment of a height of a circular saw blade is provided. The saw provides for the circular saw blade to be secured to a front end of a mainframe mounted on an undercarriage. A major height adjustment is performed by adjusting the height of the mainframe relative to the undercarriage. Further, the undercarriage supports wheels for the saw, and a fine height adjustment is performed by adjusting the height of a front end of the undercarriage relative to the ground through the use of an eccentric front axle.

Abstract: A rotatable cutting tool unit of a tool assembly for a cutting machine that is used in conjunction with an associated method of cutting provides several novel aspects. The tool arrangement, which includes two tool units, includes first and second disk-shaped tools rotatable about an axis. The tools define maximum tool arrangement boundaries along the axis. A driving arrangement, at an axial location between the first and second tools, supports the first and second tools for rotation and transfers driving force. A radially outer periphery of the driving arrangement is at a radius less than a radius of a peripheral cutting edge portion of the first tool and less than a radius of a peripheral cutting edge portion of the second tool.

Abstract: A cutting angle adjustment device for a stone cutter includes a rectangular water sink, an inverse L-shaped support arm anchored to a lateral side of the sink, a stone cutter adjustably connected to the support arm through a coupling assembly, a pair of guide rods parallel disposed to a pair of rack on front and rear ends of the sink, a platform having two rotors aligned to each other and symmetrically arranged and slidably engaged with the inner sides of the guide rods, a vertical cutting slit and a slant cutting slit parallel formed in the upper surface thereof. Thereby, a saw blade is adjusted vertically and/or slantly relative to the top of the platform to conduct a vertical or slant cutting and a shallow or deep cutting of the workpiece.

Abstract: A cutting tool (20) capable of cutting or grooving an article with high accuracy independent of the thickness of a cutting disk blade used has a cutting disk blade (22) having a through-hole (21) at its center, an annular rigid plate (23) coaxially fixed to each face of the cutting blade (22), and an annular ultrasonic oscillator (24) having a smaller outer diameter than the rigid plate (23) which is coaxially fixed to an outer face of each rigid plate (23) or to the cutting blade (22) in contact with an inner circumferential edge of each rigid plate (23).

Abstract: A ring saw device used in the installation of manholes to afford proper installation height and angular inclination compliant to street surface. The ring saw cutting device has a support ring base that acts as an elevated and inclination guide with a dual axis cutting assembly rotatably disposed therewithin.

Abstract: The cutting apparatus of the present invention includes a frame with first and second side members that lie parallel to one another. It also includes two or more cross-members that connect the first and second side members together as well as a cantilever member that lies mounted to one of the other members and extends outwardly of that other member. A tray movably mounted on the frame holds an object for cutting; and a motor and blade assembly mounted to the cantilever member cuts the object. The method of forming this apparatus includes forming openings in the side members and inserting end portions of the cross-members into the opening to form a frame in which the cross-members are parallel to each other and perpendicular to the side members.

Abstract: A pavement treatment apparatus, for example a concrete saw, includes a bias element for biasing one part of the apparatus toward another part of the apparatus. The bias element may be one or more springs extending between an engine platform and a handle assembly.

Abstract: A movable machine such as a concrete saw has an isolator or other damping element between the working tool portion of the machine and the supporting structure, such as a frame, chassis or other structure. The working tool portion of the machine may include a tool and a motor and the tool may include a support mounted or otherwise fixed to the motor.

Abstract: This invention discloses a cutting means for slate cutter, comprising: a base, a blade and a electric motor, a support arm is mounted on the base, the support arm comprises a bracket which is able to rotate perpendicularly to the surface of the blade, and a frame is attached to the bracket, the electric motor is secured to the frame, one side of the frame is fixed to the bracket by a dowel pin pin, which is located eccentrically with respect to the axis of the blade; not only the cutting angle of the cutting means, but also the height of the blade could be adjusted, which is good in elaborate cutting and improving efficiency.

Abstract: A platform minute adjustment, expansion and collection device for a stone cutter includes a water tank supported by a pair of racks, a pair of guide rods spacedly bridged on the racks, a first water collection plate and a second water collection plate, both of which are slantly disposed to a front rack, a platform having a pair of rotors on the lower side thereof and slidably engaged on the inner sides of the guide rod. The platform has a pair of expansion plates for enlarging its size and for cutting a large-sized working piece, and two minute adjusting devices mounted on the tops of the racks for displacing the platform slightly, such that the sawdust may be stopped scattering all over the working place.

Abstract: A cutting angle adjustment device for a stone cutter includes a rectangular water sink, an inverse L-shaped support arm anchored to a lateral side of the sink, a stone cutter adjustably connected to the support arm through a coupling assembly, a pair of guide rods parallel disposed to a pair of rack on front and rear ends of the sink, a platform having two alignments of rotors symmetrically arranged and slidably engaging with the inner sides of the pair of guide rods, a vertical cutting slit and a slant cutting slit parallel formed in the upper surface thereof. Thereby, a saw blade has been adjusted vertically and/or slantly relative to the top of the platform to conduct a vertical or slant cutting and a shallow or deep cutting of the working pieces.

Abstract: The cutting apparatus of the present invention includes a frame with first and second side members that lie parallel to one another. It also includes two or more cross-members that connect the first and second side members together as well as a cantilever member that lies mounted to one of the other members and extends outwardly of that other member. A tray movably mounted on the frame holds an object for cutting; and a motor and blade assembly mounted to the cantilever member cuts the object. The method of forming this apparatus includes forming openings in the side members and inserting end portions of the cross-members into the opening to form a frame in which the cross-members are parallel to each other and perpendicular to the side members.

Abstract: A tile saw guide apparatus comprising a right-angle triangle shaped guide body and an attachment structure. The right-angle triangle shaped guide body includes a tile receiving space accessible through a first non-hypotenuse edge of the right-angle triangle shaped guide body. A first tile engaging edge defining the tile receiving space extends substantially perpendicular to the first non-hypotenuse edge of the right-angle triangle shaped guide body. A second tile engaging edge defining the tile receiving space extends substantially perpendicular to a second non-hypotenuse edge of the right-angle triangle shaped guide body. The attachment structure is fixedly attached to the right-angle triangle shaped guide body. The attachment structure is configured for fixedly securing the guide body to a table of a tile saw and extends across the hypotenuse edge of the right-angle triangle shaped guide body.

Abstract: A cutting machine includes a cutting supporting frame, a cutting head arrangement and a motor air flow arrangement which includes a driving motor to drive a cutting blade to rotate, a motor case defining a motor cavity within an open end inlet end, an open outlet end and a circumferential wall, and an air intake hood sheltering around the motor case to define an air intake passage between the air intake hood and the motor, an air intake window communicating an air intake passage with the air intake hood, an air discharging slot communicating with the open outlet end, and a sidewall defining an air chamber between an inner side portion of the air intake hood and the open inlet end. When air is sucked through the air intake window, the air is detoured to enter into the motor cavity through the air intake passage and the air chamber to generate a circulated motion of air cycle in the air intake hook for enhancing a sucking effect of the driving motor.