Abstract: A connecting device for the connection of mechanical shaft parts with a first connector section for connection to a first shaft part, a second connector section for connection to a second shaft part, and a locking mechanism. The first connector section can be connected to a mating section of the first shaft part for the transmission of torque. The locking mechanism, which is functionally independent of the transmission of torque and includes at least one displaceable element, prevents the release of the first connector section from the mating section of the first shaft part. The displaceable element of the locking mechanism can be moved between a release position, in which the first connector section can be released from the mating section, and a blocking position, which prevents release of the mating section from the first connector section. In some aspects, the locking mechanism may include an annular actuating element.

Abstract: Disclosed is an assembly for holding a tool. The assembly may selectively reduce and/or eliminate vibrations received and felt by a user. Reducing vibrations may reduce or eliminate chatter at a working end of a tool.

Abstract: Disclosed is a system to engage a plurality of tools. In the system a drive shaft and collet may be assembled to engage and disengage, selectively, a plurality of tools. User selection may allow use of a plurality of tools during a procedure or during a plurality of procedures.

Abstract: A gripping mechanism includes a holder, a gripping roller, and a downward pushing section. The holder houses the gripping roller. The downward pushing section pushes downward on an object gripped between the holder and the gripping roller. Preferably, the downward pushing section has a first downward pushing mechanism, a second downward pushing mechanism, and a third downward pushing mechanism. The first downward pushing mechanism protrudes from a ceiling surface among inner surfaces of the holder. The second downward pushing mechanism and the third downward pushing mechanism protrude from respective surfaces opposite to the object among outer surfaces of the holder.

Abstract: A tooling system has means for applying a vacuum to hold the fastener at the working end of the tool. A cavity in a hollow pusher pin has lateral ports for exclusively providing a airway between the vacuum source and the fastener. In other embodiments of the invention the pusher pin has fastener-gripping jaws in the form of balls moveable within lateral passageways in the pusher pin open into the cavity. The balls are biased inwardly against the fastener by an outer elastic band on the tool body which encircles the pusher pin. When adapted for installing magnetic-release type fasteners, the bottom end of the pusher pin is of reduced diameter for insertion into a magnetic release fastener. The fastener-receiving panel is supported by an anvil having a magnet whereby the fastener is released from the pusher pin as the fastener is pressed into the panel.

Abstract: A dynamic balancer includes an outer housing and a spindle assembly rotatably mounted to the outer housing. A frameless motor assembly is connected to selected components of the spindle assembly. A chucking assembly receives a locking member to capture a tire therebetween. The chucking assembly and the locking member are captured in the spindle assembly and rotated by the frameless motor assembly. A spring-biased return cylinder may be used with the dynamic balancer to assist in capturing and releasing the locking member with respect to the chucking assembly. An adjustable encoder assembly may be associated with the motor assembly to monitor a rotational position of the tire and/or spindle assembly.

Abstract: A pilot pin assembly is slidably receivable within a tool bit of a drill press. The pilot pin assembly includes a first pin defining an interior cavity, and a second pin at least partially received within the interior cavity of the first pin. A spring is positioned within the interior cavity for biasing the second pin toward an extended position relative to the first pin.

Abstract: Provided is a socket which includes: an outer socket, an inner socket arranged to face an inner periphery of the outer socket, a coil spring (urging member) configured to urge the inner socket toward one end of the outer socket, and a lock/unlock mechanism configured to restrict the inner socket displaced toward the other end of the outer socket against an urging force of the coil spring from being rotated with respect to the outer socket.

Abstract: A bit retention assembly, for securing a tool bit to a spindle of a rotary hammer, includes a plurality of detent members movable in unison from a locking position to an insertion position in response to insertion of the tool bit within the spindle, a biasing member configured to bias the detent members toward the locking position, and a collar movable along the spindle between a first axial position and a second axial position. The collar has an annular wall at least partially defining a pocket. A first end of the biasing member is received within the pocket when the detent members are in the locking position such that the first end of the biasing member is radially constrained by the annular wall.

Abstract: Disclosed is an assembly for holding a tool. The assembly may selectively reduce and/or eliminate vibrations received and felt by a user. Reducing vibrations may reduce or eliminate chatter at a working end of a tool.

Abstract: A coupling device and coupling method for the self-securing mechanical connection of two parts of a holding system for medical instruments, including a bolt element insertable into a bushing; wherein the bushing has a main body and, connected fixedly to the latter, a cone sleeve which tapers conically at its free end, wherein a cage sleeve acted upon by a spring and guiding clamping bodies is inserted axially movably into the cone sleeve and can be moved between an uncoupled position, a release position and a locking position. The clamping bodies in the locking position can be latched into a coupling groove of the bolt element by means of the spring force. The inclined coupling groove flank, at the front in the insertion direction, of the bolt element encloses an angle ? with the longitudinal axis of the bolt element, and the cone inner face of the cone sleeve encloses an angle ? with the central sleeve axis.

Abstract: A burr attachment designed for use with a curved burr attachment or other chuck attachments that includes a tube with a wire shaft supported therein and a coil spring surrounding said wire shaft and having each of the coils touch the outer periphery surface of the wire shaft and the inner peripheral surface of said tube to enhance cooling of said outer periphery of said tube from the heat generated by said wire shaft and attenuate vibrations while allowing said burr attachment to be bent without kinking.

Abstract: Holder for a rotary tool which holder is formed with a holder body comprising a rear drive end and a front connection end having a connection thread for the connection of the tool. The holder comprises a thrust collar having a flat contact surface facing a connection end of the holder. The holder comprises an axially movable operating means, a number of restraint elements placed in one or more spaces in the holder body which restraint elements in a first axial position of the operating means are prevented from radial movement in said spaces and which restraint elements in a second axial position of the operating means allow radial movement in said spaces. Each one of said spaces for the restraint elements is limited in the axial direction by a front limiting wall and a rear limiting wall, which two limiting walls are parts of the holder body.

Abstract: A mandrel assembly includes a mandrel, adapter, and bit coupler. The mandrel includes a shank part axially disposed in the mandrel, an adapter receiver, and a coupler receiver. An internal hole runs axially through the adapter. The coupler includes first and second axial sections, and an axial bit connection hole with a polygonal section proximate to an inner side, and a cylindrical section proximate to an opening. An outer wall of the adapter fits with an inner wall of the adapter receiver. An outer wall of the first section fits with an inner wall of the coupler receiver. An outer wall of the second coupler fits with the internal hole of the adapter. The mandrel transmits torque, via the adapter receiver and coupler receiver, to the adapter and then to a hole saw coupled to the adapter, and to the coupler and then to a bit coupled to the coupler.

Abstract: A cutting tool includes a hole saw, a pilot bit, and an arbor assembly. The assembly includes a shank having a first end and a second end. The first end of the shank is removably coupled to the hole saw and to the pilot bit, and the second end of the shank is configured to be coupled to a power tool. The assembly also includes a sleeve moveable along the shank and a first ball bearing disposed on the sleeve. The first ball bearing engages the hole saw to releasably secure the hole saw to the shank. The assembly includes a second ball bearing disposed on the shank. The second ball bearing engages the pilot bit to releasably secure the pilot bit to the shank. When the sleeve moves toward the second end of the shank, the first and second ball bearings disengage the hole saw and the pilot bit.

Abstract: A mechanical coupling for rotary devices, whereby a wind vane or other rotary tool, can be replaced without the use of a tool. In a preferred embodiment, the invention provides a coupling arrangement for a rotary device and a spindle supported for rotation, the coupling being enabled by a resilient body which acts upon a spheroidal locking member such as a ball bearing. In particular, the present invention provides a coupling arrangement for a wind vane or an anemometer rotating body comprising impeller cups, which impeller cups and rotating body are required for removable fitment, without the use of tools.

Abstract: A quick detachable and adjustable magnetic seat for sleeve includes a magnetic device and a detachable positioning device. The magnetic device includes a first end and a second end. The first end is magnetic. The detachable positioning device includes a connecting end slidably disposed on the second end of the magnetic device, such that the magnetic device axially slides against the detachable positioning device. The detachable positioning device further includes a resilient quick detach device disposed on one end of the detachable positioning device away from the connecting end, whereby the detachable positioning device is removably disposed in a sleeve. Therefore, when the sleeve is damaged or broken, the adjustable magnetic seat is efficiently removed from the sleeve and re-installed in a new sleeve replacement.

Abstract: Disclosed is an assembly for holding a tool. The assembly may selectively reduce and/or eliminate vibrations received and felt by a user. Reducing vibrations may reduce or eliminate chatter at a working end of a tool.

Abstract: A hand tool includes a handle having a room defined therein. A first and second lugs extend from the front end of the handle. A space is defined between the first and second lugs and communicates with the room. A working part is to be connected with a bit, and has a pivotal portion which is pivotably connected between the two lugs. A plate is connected to at least one of the first and second lugs, and has multiple first recesses and a second recesses. A positioning member is located between the pivotal portion and the plate so as to be engaged with one of the first and second recesses to position an angular position of working part. The working part is able to be pivoted and received in the room in the handle.

Abstract: A tool holder is disclosed. The tool holder has a tubular main part, a locking element, which lies in the first radial channel of the main part, and an actuating sleeve which can be moved between a removal position and a locking position. The main part has a depression on the outside and a second radial channel which passes into the receiving area starting from the depression. The actuating sleeve has a radially pre-tensioned latching element which engages into the depression in the removal position. An ejection element is guided in the second radial element where the ejection element is pushable by the latching element into a position which partially protrudes into the receiving area and where the ejection element displaces the latching element out of the depression when the ejection element is moved to a position which is retracted from the receiving area.

Abstract: A drill chuck assembly. The drill chuck assembly includes a rapid change mechanism configured to retain a drill bit shank inserted therein. The drill chuck assembly includes a body having a bore with a trilobe cross-section that is configured to receive a triangular and hexagonally shaped drill bit shank, interchangeably. The bore includes a slot positioned in each lobe that slidably contains a detent ball therein. A collar is affixed annularly around the body and defines a channel extending around the body. A sleeve is slidably mounted around the body. The sleeve includes a tapered end that is slidably disposed within the channel and has circular apertures that are in communication with the slots of the bore for reception of the detent balls. The sleeve is spring biased towards the collar, which forces the detent balls against an angular wall within the channel.

Abstract: A chuck assembly for a dental handpiece includes a hollow cylindrical tube portion having a first internal bore, and a chuck portion having a second bore. The chuck portion is supported within the first bore co-rotational with the tube portion about a common axis. The chuck portion has an annular body portion defining the second bore for supporting a cylindrical tool therein. A drive element comprising a drive pin inserted in a first end of the tube portion traverses the first internal bore at a first end of the tube portion. The drive pin cooperates with a distal end of a rotary tool insertable into the second bore to transfer torque to the tool. The tool has an elongated body portion having a driven portion and a working portion. The driven portion includes a shank portion with channels for receiving the drive pin.

Abstract: A mechanical end-effector changer includes a first connection unit and a second connection unit. The first connection unit has mounted therein multiple movable members and mating elastic members. Subject to the linking relationship between each movable member and the respective elastic member, the first connection unit and the second connection unit can be automatically connected together or detached from each other, facilitating end-effector change.

Abstract: A steering column lock comprises a bearing-mounted, free-rotating keyhole cover that covers an underlying locking device. When installed on the steering column of a vehicle, the steering column lock prevents a would-be car thief from grabbing the lock with pliers or another tool and using the lock to turn the steering column and thus drive the vehicle, because rotation of the free-rotating outer cover does not cause rotation of the other portions of the lock.

Abstract: A socket assembly for turning a fastener with a wrench has ball mechanisms that normally engage with sides of the fastener and that can be deactivated out of engagement with the fastener by turning a collar of the socket assembly. The socket includes a socket body having a fastener receiving opening sized and shaped to engage the fastener so as to drive the fastener rotationally. At least one ball opening is provided in the fastener receiving opening adjacent the fastener when the fastener is received in the opening. A ball is provided capable of partially protruding from the ball opening with the socket in an engaged state. A ball taper insert cams against the ball to push the ball into the ball opening. A spring biases the ball taper insert so as to urge the ball into the ball opening to engage the fastener.

Abstract: The invention relates to a power drill, having a tool-clamping device that is fastened to a spindle shaft, having a torque clutch that includes an axially movable clutch plate on which an axial force is exerted by a plurality of compression springs that cooperate at least indirectly with an adjusting nut situated on a housing component. The compression springs are accommodated in first recesses embodied in the longitudinal direction of the housing component. A device for axially moving an axial bearing situated on the spindle shaft, is provided at the end of the spindle shaft oriented toward the tool-clamping device. According to the invention, on its side oriented toward the clutch plate, the device for axially moving the axial bearing has at least one actuating section that is situated in a second recess of the housing component and on the side oriented toward the clutch plate, cooperates with an adjusting element for the device.

Abstract: A chuck for a chiseling power tool has a holding sleeve that is arranged concentrically with respect to a working axis and that serves to receive one shank end of a tool having a locking groove. A locking element protrudes partially into the holding sleeve so as to engage with the locking groove. A sliding block guides the locking element, whereby the sliding block has a section that is wound helically around the working axis.

Abstract: Quick release mechanisms for auger type cleanout tools are described. The mechanisms enable engagement and disengagement of a handle to an auger without the use of separate retainers or fasteners. Also described are auger type tools and related methods of use utilizing the quick release mechanisms.

Abstract: A tool receptacle is disclosed. The tool receptacle has a receiving sleeve which has a prismatic or cylindrical cavity for receiving a tool and an elongated hole for receiving a locking body. The elongated hole has a closed edge formed of two opposing longitudinal sides at a constant distance and two end sides completing the elongated hole. An extension along the working axis of at least one of the end sides is less than half of the constant distance of the opposing longitudinal sides. A groove running parallel to the working axis is provided on an inner surface of the receptacle sleeve. The groove is disposed in an extending manner at the elongated hole on the inner surface along the working axis.

Abstract: A drill chuck assembly. The drill chuck assembly includes a rapid change mechanism configured to retain a drill bit shank inserted therein. The drill chuck assembly includes a body having a bore with a trilobe cross-section that is configured to receive a triangular and hexagonally shaped drill bit shank, interchangeably. The bore includes a slot positioned in each lobe that slidably contains a detent ball therein. A collar is affixed annularly around the body and defines a channel extending around the body. A sleeve is slidably mounted around the body. The sleeve includes a tapered end that is slidably disposed within the channel and has circular apertures that are in communication with the slots of the bore for reception of the detent balls. The sleeve is spring biased towards the collar, which forces the detent balls against an angular wall within the channel.

Abstract: A connecting device may have a tooth-shaped jacket, a locking body internally of the tooth-shaped jacket, a plurality of balls, a spring, and a spring base. The locking body has a rear end with an annular groove and has a neck with a plurality of spherical recesses containing the balls. Radial positioning between the locking body and the tooth-shaped jacket is realized through the balls. The spring is connected between the tooth-shaped jacket and the spring base and axial positioning between the spring base and the locking body is realized through a snap ring in the annular groove.

Abstract: A hand-held hydraulic assembly includes a work tool having a hydraulic cylinder or main body, a ram piston disposed in the hydraulic main body and a spring or other biasing member mounted on the ram piston. An interchangeable work head is selectively engaged to the ram piston of the work tool. The ram piston is axially displaceable in the main body for actuating the work head. A quick release coupling mounted to the work tool releasably connects the interchangeable work head to the work tool.

Abstract: Provided in a quick coupling system for fastening an interchangeable head to a pressing tool is a securing arrangement. The pressing tool has a press ram, which is movable in an axial direction, for actuating a pressing device in the interchangeable head. The quick coupling system has no thread and has either a bayonet closure or a securing arrangement having radially displaceable securing elements.

Abstract: A handheld machine tool having an output shaft on which a tool holding fixture is developed, which has a multi-faced inner receptacle and a multi-faced outer receptacle, the multi-faced inner receptacle to connect to a tool insert, which can be locked using a locking device assigned to the tool holding fixture; the locking device having a locking sleeve which is displaceable for unlocking the tool insert against a spring force applied by an associated spring element in an axial direction facing away from the handheld machine tool, from a locking to an unlocking position, the locking sleeve has an operating element and a holding element connected to each other via a threaded connection, the holding element driven by the associated spring element in the direction of the locking position of the locking sleeve and the operating element enables displacement of the locking sleeve from the locking to the unlocking position.

Abstract: In one embodiment, a quick connect interface for a surgical instrument includes a body having an inner cavity that includes a flat. Two or more ball bearings are each disposed in a respective hole in the body. A sleeve is slideable along the body. The sleeve includes a camming ramp that urges the two one or more ball bearings to partially extend through the holes into the inner cavity when the sleeve is in a locked position. The two or more ball bearings are positioned to, when the shaft of the replaceable tool is disposed in the inner cavity, urge the shaft to a side of the inner cavity that includes the flat. The ball bearings may be positioned radially about a central axis of the body substantially 90 degrees apart. The camming ramp may include at least one plateau that prevents unintentional release of the shaft.

Abstract: A hook device (2) for hanging objects such as picture frames comprises a housing (10) which has an internal space for allowing a carrier for the hook device (2) to extend through the housing (10), and which is normally provided with a projection designed for functioning as a hanging hook. The hook device (2) further comprises a clamping mechanism for fixing the housing (10) on a carrier, wherein the clamping mechanism comprises a first hollow cylinder (20) having a tapered inner surface (21), which is retained in the housing (10) in an axial direction by form closure. During the assembling process of the hook device (2), the first hollow cylinder (20) is inserted into the housing (10) by moving the cylinder (20) through an opening (17) in a radial direction, different from other elements (30, 40, 50) of the hook device (2), which are moved in an axial direction.

Abstract: A highly secure instrument adapter includes a handle with an internal locking and release mechanism which does not use a pushing release and which requires little physical effort to lock and release, yet provides a stable and secure connection between an instrument and the handle. The locking mechanism is comprised an ergometric handle having an open handle cavity, a receiver having an internal threaded tubular body and a plurality of locking apertures, and a rotating collar having a limited range of rotation, a plurality of fingers that project outward from the flattened surface on a spacer structure, and a plurality of circular apertures placed alternately between said fingers.

Abstract: A reciprocating saw that includes a spindle including a blade slot configured to receive a saw blade. The saw further includes a blade clamp operable to removably couple the saw blade to the spindle, and the blade clamp includes a first actuator pivotable about the spindle between a locked position and an unlocked position, and a first locking member movable relative to the blade slot between an engaged position and a disengaged position in response to movement of the first actuator between the locked position and the unlocked position. The blade clamp further includes a second actuator pivotable about the spindle between a locked position and an unlocked position, and a second locking member movable relative to the blade slot between an engaged position and a disengaged position in response to movement of the second actuator between the locked position and the unlocked position.

Abstract: Device for clamping a workpiece holder on a collect chuck that can be fixed to a machine tool, having clamping elements distributed around the circumference of the collet chuck. The clamping elements can be adjusted radially to the axis of the collect chuck from a release to a clamping position and can be pressed against a circumferential surface of the workpiece holder positioned relative to the collet chuck in the clamping position. The clamping elements are designed as rollers having axes aligned nearly tangentially to the collet chuck circumference. A determinable surface pressure thus results in the clamping position as the rollers mutually contact the workpiece holder, a clamping mandrel of the collet chuck, and the collect chuck part. The surface pressure is thereby reduced and the collet chuck can also be used in the range of greater tensile forces.

Abstract: A cutter assembly has an adapter, an outer collar, a recoil spring, a head, a pushing assembly and a central drill. The adapter has an L-shaped guiding slot and multiple balls. The outer collar is slidably and rotatably mounted around the adapter and has an annular protrusion and a positioning rod. The annular protrusion selectively abuts against the balls. The positioning rod is mounted on the outer collar and extends slidably into the guiding slot. The head is mounted detachably on the adapter and has a saw and an inserting rod. The inserting rod is inserted into the adapter and has an annular engaging groove. The annular engaging groove is formed around the inserting rod at a position corresponding to the balls to selectively hold the balls in the engaging groove.

Abstract: A cutting tool assembly includes a mandrel member and a cutting tool. The mandrel member has a shaft rod and a slide sleeve fitted around the shaft rod. At least one alignment pin is mounted in the shaft rod and at least one engagement pin is disposed in the slide sleeve. At least one locking member is disposed between the shaft rod and the slide sleeve. The cutting tool has a shank body and a tool bit. At least one alignment sink is disposed on the shank body. When assembled, the shank body is plugged into the shaft rod to align the alignment pin with the alignment sink so as to release the slide sleeve from the engagement of the engagement pin, permitting the slide sleeve to move to a locking position where the locking member is latched with the cutting tool.

Abstract: Surgical instrument with a handpiece having a drive and with a surgical tool, which has a tube and a working part with a shaft and with a tool head, the tube of the surgical tool can be detachably connected to the handpiece by a first coupling part and the shaft of the working part can be detachably connected to a drive shaft in the form of a pin of the drive by a second coupling part simultaneously.

Abstract: A tool connector generally includes a tool receiving portion configured for reciprocating between first and second work tool seating positions, wherein the tool receiving portion is normally biased to the first work tool seating position, and actuatable to the second work tool seating position. The tool connector further includes a magnetic mechanism in the tool receiving portion for providing magnetic force to engage a work tool in either of the first and second work tool seating positions, and a locking mechanism for lockingly engaging a work tool in the second work tool seating position.

Abstract: A bit retention device includes a shaft having a sidewall defining a hexagonal cavity extending from a first end thereof and a ball groove extending through the sidewall and communicating with the hexagonal cavity. A ball is disposed in the ball groove and a ball spring engages the ball and biases the ball toward the first end. An actuator sleeve surrounding the shaft includes an internal ramp engaging the ball. A spring biased plunger assembly is disposed in the bore for biasing a bit received in the bore in a direction toward the insertion end.

Abstract: A securing mechanism is provided for a tool that allows for the attachment and release of the shafts of a variety of implements from the tool. The mechanism has a construction that provides an easily releasable, but secure engagement of the implement shaft within the mechanism while also having an alignment feature which engages the implement at multiple locations when engaged with the mechanism to maintain the alignment and concentricity of the implement shaft with regard to the mechanism and the tool when in use.

Abstract: A tool joint is revealed. The tool joint includes a first main body, a second main body, locking members and a sleeve set. The first main body consists of a mounting part, a stopping part and a rear part. The second main body is disposed in the mounting part and having a polygonal assembly slot penetrating the second main body. Insertion holes are disposed close to an opening end of the assembly slot. The second main body is a polygonal column whose shape matches that of the polygonal assembly slot. The locking member is against the stopping part. The sleeve set is mounted in the assembly slot. The tool joint features on that the second main body is unable to rotate radially in the mounting part by the polygonal column design of the second main body locked with walls of a polygonal slot of the mounting part.

Abstract: The present invention is a self-locking internal adapter for D-shaped orthopedic tools. A locking ball mechanism prevents movement of the adapter components relative to each other, while a plurality of securing ball mechanisms releasably secure a D-shaped orthopedic tool in the adapter. A chamfered surface of the adapter engages a chamfer of the tool to centrally stabilize the tool in the adapter. The internal adapter may be used with driver handles, ratcheting handles and torque-limiting handles.

Abstract: A fastener holder includes a driving tool stem having a number of orifices, a driving tool shank engaged in the stem for engaging with a tool element and having a number of depressions formed in the shank, a number of bearing members engaged in the orifices of the stem for engaging with the depressions of the shank and for selectively anchoring the shank to the stem, and a barrel includes a relatively smaller segment for selectively engaging with the bearing members and for forcing the bearing members to engage into the depressions of the shank and to anchor and lock the driving shank to the stem and for allowing the driving shank and the tool element to be selectively rotated and driven by the stem.

Abstract: A cutter-changing device includes a cutter-magazine carrying cutters, a rotary telescopic cylinder, and a clamping sub-assembly. The clamping sub-assembly includes a cutter-changing arm, and a pair of clamping assemblies. The rotary telescopic cylinder drives the cutter-changing arm to rotate, extend and retract. Each clamping assembly includes a mounting member, an elastic member, a piston, and at least one resisting member. The mounting member is mounted on the cutter-changing arm, and defines at least one mounting hole through the sidewall thereof. The elastic member and the piston are sleeved with the mounting member, and the two opposite ends of the elastic member press against the piston and the mounting member. The resisting member is mounted between the elastic member and the mounting member, and capable of being resisted by the piston to be partially exposed from the mounting hole.

Abstract: A surgical milling cutter includes a milling cutter bracket, a locking device and a bottom electric motor connected successively. The milling cutter bracket includes a fixing seat with a through hole. A finger guide apparatus with an L-type first bracket at the top end thereof is provided on the upper part of the fixing seat. The end of the L-type first bracket's short side is provided with a downward projection. The lowest point of the projection is lower than that of the milling cutter's cylindrical head when the milling cutter is working normally. The surgical milling cutter utilizes the projection to prevent the possibility of an object contacting with the cylindrical head, thus avoiding an object being cut unevenly. Meanwhile, the L-type bracket can be driven by the finger guide apparatus to rotate so as to change the running direction of the milling cutter, thus facilitating surgical procedures.