Abstract: Provided is a gear box removable electrically driven torque wrench. The gear box removable electrically driven torque wrench includes: a body casing 10 including a body part 12 in which an electric motor and a motor driver are mounted in an internal accommodation space and a handle part 14 extending downward of the body part; a gear box 20 dynamically coupled to a motor rotation shaft 13 of the electric motor in front of the body part 12, and adding and reducing an output according to driving of the electric motor and transmitting the added and reduced output to a tightening member; and an adapter socket including a coupling adapter installed on a gear box coupled surface 11 in front of the body part 12 and a coupling socket fixedly installed on a body coupled surface 21 at the rear of the gear box 20 and detachably coupled to the coupling adapter.

Abstract: An impact tool having an exchangeable handle structure includes an impact tool main body. A rear-end portion of the impact tool main body forms an engaging portion having two lugs respectively on a top surface and a bottom surface and an annular body on a rear-end surface. Two penetrated portions respectively extend from a top side and a bottom side of the annular body. A left-half part and a right-half part of a front-end portion of a casing cover the lugs and the annular body. A plurality of fixing members respectively passes through the lugs, arm casings formed by the casing, the penetrated portions, and a rear annular casing of the casing. The rear annular casing is connected to a handle having a triggering member. The impact tool main body is detachably engaged with a handle device through the engaging portion.

Abstract: The present disclosure generally relates to quick change attachments for a pneumatic percussive tool. The attachments convert a pneumatic percussive tool, such as an air impact tool with proximal attachment, which has a “pushing” force, into a pneumatic percussive tool having a “pulling” force. Once attached to the pneumatic percussive tool, the attachments also provide a quick change feature for allowing “pulling” tools to be simply and easily removed and replaced.

Abstract: A power tool for chiseling and drilling includes a housing, a motor disposed inside the housing, and a pneumatic percussion mechanism. An operation mode selector switch is disposed on the housing and has a first operation mode setting and a second operation mode setting where the first operation mode setting activates the pneumatic percussion mechanism and the second operation mode setting deactivates the pneumatic percussion mechanism. A valve has an inlet-port formed inside the guiding tube and an outlet-port formed outside the guiding tube where the valve is connected to the operation mode selector switch. The valve is closed in the first operation mode setting which disables an air exchange between the inlet-port and the outlet-port and the valve is open in the second operation mode setting which enables the air exchange between the inlet-port and the outlet-port.

Abstract: An accessory for an electric drill is disclosed as including a dust box for receiving abraded materials produced by an electric drill on a workpiece, the dust box including an internal cavity, a first longitudinal end with a first opening communicating with the internal cavity, an opposite second longitudinal end with a second opening communicating with the internal cavity, and a brush or a disc. When a drill bit of the electric drill is received into the internal cavity of the dust box through the second opening, the brush or disc is releasably engageable with the drill bit for simultaneous rotational movement about a longitudinal axis of the drill bit.

Abstract: A winch with handheld battery powered tensioning and payout unit provides uniform loading of all winches and allows for safe easy loading and payout. A method and apparatus is provided for retrofitting manual winches, in particular manual marine winches, to be operable with a handheld battery powered tensioning and payout unit.

Abstract: A combination nail dowel gun for efficient tilt up construction includes a hollow gun body comprising a handle portion and an upper portion. A pneumatic hammer is coupled within the gun body and has a barrel extending through a barrel aperture. A projectile feed belt is disposed within a canister, through a belt feed track, and into a muzzle of a projectile feeder. The projectile feed belt comprises a plurality of projectiles and a projectile alignment matrix. The plurality of projectiles is alternating dowels and nails and is coupled to the projectile alignment matrix. The plurality of projectiles is loaded into the barrel by the belt feed track and is then fired through the barrel by the pneumatic hammer. A trigger is coupled to the bottom side of the upper portion adjacent the handle portion. The trigger is in operational communication with the pneumatic hammer to fire the plurality of projectiles.

Abstract: A power tool includes a brushless motor having a stator and a rotor, which includes a rotary shaft extending in a front-rear direction of the power tool. The rotary shaft rotates a spindle that extends in an up-down direction of the power tool. A fan is fixedly coupled to the rotary shaft and rotates therewith. A switch is disposed rearward of the brushless motor and a controller is disposed rearward of the switch in the front-rear direction. A battery pack is disposed rearward of the controller. A main-body housing houses the brushless motor, the switch and the controller. The main-body housing includes a first tubular part, which houses the brushless motor, and a second tubular part, which houses the switch. The diameter of the second tubular part is smaller than the diameter of the first tubular part.

Abstract: A wireless small motor driver, in which power consumption is decreased by adjusting a gear ratio, the efficiency of an operation is increased due to a high torque, and the safety of a worker at night is ensured using an illumination lamp. The wireless small motor driver includes a driver case inside of which a motor is provided. A driver bit has a predetermined length in a bilateral direction, the driver bit being replaceable, with one or both ends thereof conforming to the shape of a bolt, and has a fixing projection. A socket is coupled to an end portion of the driver case, the driver bit being fastened to the socket. A rotation reduction gear is coupled to the motor, the rotation reduction gear transmitting rotary force to the socket and increasing a torque. A USB and a battery for supplying uniform power to the motor are added.

Abstract: The invention relates to a connection for releasably connecting two parts of an electro-mechanical device, the connection including: a first connecting portion associated with a first part, and a second connecting portion associated with a second part, such that engagement of the first and second connecting portions imparts bias between the two parts, and a retention means suitable for maintaining the bias between the two parts.

Abstract: A motor-driven machine tool includes a drive unit and a tool changing magazine with tool chambers that are placed into a transfer position adjacent to a tool receptacle to be loaded. The machine tool includes a tool changing device with a slide element that is arranged in operative connection with a tool. The slide element is moved by an operating element into a first position for accepting a tool from or transferring a tool to the tool chamber and into a second position to drive the tool. The slide element is fixed in the second position by a blocking element that is brought out of operative connection with the slide element by a transfer element to move the slide element from the second position to the first position. The slide element is arranged in indirect contact with the blocking element to move the blocking element by the transfer element.

Abstract: A drive system for releasably interconnecting a motor shaft of a rotary hand held power tool and an input shaft of an attachment device that is mounted thereon includes an elongated flexible drive shaft and an elongated output shaft. The flexible drive shaft is connected to the input shaft of the attachment device and includes an outer end portion with a non-circular cross-section configured to engage a complementarily shaped cavity of an output shaft operatively attached to the power tool motor shaft. The elongated output shaft is operatively connected to the motor shaft of the power tool. The output shaft defines a generally cylindrical outer configuration along its length and includes a rearward mounting portion for attachment to the motor shaft and an intermediate portion having the complementarily shaped cavity for receiving the flexible drive shaft.

Abstract: A power tool system which includes a first base unit and a second base unit. The first and second base units each include a housing, a motor housed in the housing, a coupler which is operatively connected to and selectively drivable by the motor and a trigger for activating the motor to drive the coupler. The system also includes a first attachment head which is removably couplable with both the first base unit and the second base unit so that it can be driven by the respective motor of the base unit to which it is attached and a second attachment head which is removably couplable to the first base unit, but which is not couplable with the second base unit.

Abstract: An electric power tool comprises one or more optical waveguides which are combined with a shaped body so as to form a support element having a stable shape. The light guides may be part of optical switches or sensors. The support element ensures protection of the optical waveguides from vibrations, dust and so on, whereby a high level of operational reliability is ensured.

Abstract: A system includes a power tool having a motor, a drive mechanism mechanically coupled to the motor, and an output element mechanically coupled to the drive mechanism. The motor is operable to drive the drive mechanism and the output element. The system also includes a non-motorized sensing tool having a printed circuit board and a sensing element electrically coupled to the printed circuit board. The sensing element is operable to detect an external characteristic and output a signal to the circuit board. The circuit board is operable to condition the signal into a human-comprehensible form. The system further includes a rechargeable battery pack removably and independently coupled to the power tool and the non-motorized sensing tool to power the motor to drive the drive mechanism and the output element when connected to the power tool and the circuit board and the sensing element when connected to the non-motorized sensing tool.

Abstract: An anvil assembly for a tool includes an anvil having a body with an outer periphery and a head formed on a distal end of the body. The anvil assembly also includes a sleeve surrounding at least a portion of the outer periphery of the body. The sleeve has a distal end against which a tool element is abutted when the tool element is coupled to the head.

Abstract: A hydraulic breaker hammer casing assembly for converting a hydraulic breaker hammer to a pile driving apparatus for driving piles into the ground. A hydraulic breaker hammer is immovably retained in a support housing. The hydraulic breaker hammer is fitted with a blunt working implement for transmitting blows to a drive cap supported on top of a pile. A pile guiding assembly is secured at an open bottom end of the support housing for guiding, in axial alignment with the working implement, the pile being driven in the ground. The casing assembly protects the hydraulic breaker hammer secured therein and provides access thereto as well as displaceable connection to a boom of a pile driving rig.

Abstract: There is disclosed a post extractor comprised in a post-pounder, the device having a length and a crosswise extraction hole. The hole may be sized to accept an exposed portion of the post and may have an engaging edge for engaging an exposed portion of the post. Methods of using the extractor to extract a post are also disclosed.

Abstract: A power tool handle is selectively connectable to a power tool head. The power tool handle includes a grip portion defining a longitudinal axis, and a motor housed within the handle and including a drive shaft driven by the motor, the drive shaft mounted for rotation within the handle and defining an axis of rotation substantially parallel to the longitudinal axis of the handle. The power tool handle also includes a trigger disposed proximate the grip portion for actuating the motor, and a button movable in a direction defining an axis substantially parallel to the longitudinal axis to a first position when the tool head is coupled to the handle and to a second position when the tool head is removed from the handle. In the first position, the trigger can actuate the motor, and in the second position, the trigger is inhibited from actuating the motor.

Abstract: A percussive augmenter bit includes a connection shaft for mounting the bit onto a rotary drill. In a first modality, an actuator percussively drives the bit, and an electric slip-ring provides power to the actuator while being rotated by the drill. Hammering action from the actuator and rotation from the drill are applied directly to material being drilled. In a second modality, a percussive augmenter includes an actuator that operates as a hammering mechanism that drives a free mass into the bit creating stress pulses that fracture material that is in contact with the bit.

Abstract: An anchor installation tool has an elongated driving member with a body portion and a head portion. A retaining mechanism retains the anchor installation to the drill bit. The mechanism has a housing on the body portion with a pair of bias lugs that project through the body portion to contact the drill bit. An anchor guide slides on the body and head portion and has a holding member to hold an anchor. The anchor is held in the anchor guide and a drill bit is inserted into the driving member. Axial movement of the drill bit is transferred into axial movement of the driving member. The movement strikes the anchor and ejects the anchor from the anchor guide into a surface.

Abstract: A surgical device comprising an adapter assembly is disclosed. The adapter assembly selectively interconnects a loading unit and a device housing, and includes at least one drive converter assembly for interconnecting a rotatable drive shaft and an axially translatable drive member of the loading unit. The at least one drive converter assembly converts and transmits a rotation of the rotatable drive shaft to an axial translation of the axially translatable drive member of the loading unit. The at least one drive converter assembly includes a drive element, a drive nut, and a distal drive member. The drive element defines a longitudinal axis. The drive nut is disposed about the longitudinal axis, and the distal drive member is disposed along the longitudinal axis.

Abstract: The present invention provides multi-directional oscillation from a rotational source, by receiving a rotational motion, converting the rotational motion to a first oscillating motion, converting the first oscillating motion to a second oscillating motion that is normal to the first oscillating motion and transferring the first oscillating motion and the second oscillating motion to a working element.

Abstract: In a hydraulic tool such as a crimping or cutting tool used by electric utility workers, interchangeability of heads and interchangeability of power units is afforded by connecting a cylinder on the power unit to a receiver on the head. Interlocking lugs allow the head to be secured to the power unit at any selected one of a plurality of rotational positions. A piston and a movable die in the head also have interlocking lugs. To enable the lugs on the piston and movable die to engage simultaneously with the engagement of the lugs on the cylinder and receiver, the piston is secured against rotation by a slotted guide the slots of which receive inwardly protruding pins fixed to the piston. For increased versatility, plural pressure relief valves can be selected by means of a manual selection valve to set the maximum force exerted by the tool.

Abstract: A power tool including a power tool base unit with a motor surrounded by a motor housing a first coupler operably connected to the motor and a ledge. An attachment head is removably attached to the base unit, the attachment head including a second coupler, the first and second couplers being coupled together to transfer rotational motion from the motor to the attachment head. An angle between a longitudinal axis of the handle and a longitudinal axis of the motor is between 50 and 120 degrees. The ledge extends outwardly from the power tool base in a direction towards the attachment head in a direction substantially parallel to the longitudinal axis of the motor.

Abstract: An impact tool includes a housing, a motor having an output shaft defining a first axis, a drive shaft rotatably supported by the housing about a second axis oriented substantially normal to the first axis, and an impact mechanism coupled between the motor and the drive shaft and operable to impart a striking rotational force to the drive shaft. The impact mechanism includes an anvil rotatably supported by the housing and coupled to the drive shaft, and a hammer coupled to the motor to receive torque from the motor and impart the striking rotational force to the anvil. The impact tool also includes a ratcheting mechanism operable to prevent rotation of the anvil and the drive shaft in a selected direction relative to the housing.

Abstract: To provide a machine tool capable of coping with both a workpiece requiring a small driving force, for example, having good machinability and a workpiece requiring a large driving force, for example, having poor machinability. The machine tool includes a coupling mechanism 9 which couples a first tool post (first tool driving mechanism) 5 and a second tool post (second tool driving mechanism) 6 so that a driving force of the second tool post 6 is added to a driving force of the first tool post 5.

Abstract: A power tool is provided which accommodates interchangeable tool heads. The power tool includes: a tool body having a housing and an electric motor mounted within the housing, as well as a tool head that releasably attaches via a mechanical connection and an electrical connection to the tool body. The tool releasably connects to the output shaft of the electric motor when the tool head is attached to the tool body. A tool switch interposed between a power source for the electric motor and the electric motor is operable to supply power from the power source to the electric motor. A tool accessory switch interposed between the tool accessory and the power source for the electric motor is operable to supply power from the power source via the electrical connection to the tool accessory, thereby providing the tool operator independent control of the tool accessory.

Abstract: A track guiding system includes a track comprising a linear beam and a linear plate operatively coupled to the linear beam. The linear plate has opposing first and second surfaces separated by a first distance and opposing first and second edges separated by a second distance. A first compound edge roller and a second compound edge roller are disposed adjacent to the first and second edges of the linear plate, respectively, for travel along the first and second edges of the linear plate. Each of the first and second compound edge rollers include a first roller element adjacent to the first surface of the linear plate and a second roller element adjacent to the second surface of the linear plate. A carriage is coupled to the first and second compound edge rollers.

Abstract: A washer holding device for temporarily retaining nonmagnetic washers being applied to a building material surface with a fastener gun comprises an arm for affixing the washer holding device to a fastener gun and a washer receptacle joined to the arm. The washer receptacle includes a contacting end, a washer receiving cavity, and a central aperture, with the contacting end defining a distal end of the washer holding device and the cavity sized to receive a nonmagnetic washer such that the washer is temporarily retained within the cavity via a friction fit. An embodiment may include a shoulder, such as an annular flange, recessed from the contacting end, with the shoulder adapted to contact the surface of a deformable building material to limit the depression of the washer receptacle into the building material. The arm may be of various configurations for use with different style fastener guns.

Abstract: A rotary power tool according to the invention includes a manual ratchet mechanism having a driveshaft driven by a motor, an output shaft, a disengageable shaft coupling element for mechanically coupling the driveshaft to the output shaft, and a disengageable ratchet element for blocking rotation of the output shaft unidirectionally. The invention provides that one of the coupling element and the ratchet element is engaged, the other one is disengaged.

Abstract: The present invention is an articulating hand power tool with a main housing having a longitudinal axis, a head portion rotatably engaged with the main housing for placement at a plurality of angles with respect to the longitudinal axis of the main housing, an integrated circuit board located within the main housing and at least one controller accessible from outside of the main housing for controlling the integrated circuit board.

Abstract: The present invention provides multi-directional oscillation from a rotational source, by receiving a rotational motion, converting the rotational motion to a first oscillating motion, converting the first oscillating motion to a second oscillating motion that is normal to the first oscillating motion and transferring the first oscillating motion and the second oscillating motion to a working element.

Abstract: A power tool having a housing, an electric motor disposed in the housing, and a spindle drivingly attached to the electric motor. The spindle includes a cavity adapted for receiving a bit therein and a window extending through the spindle in communication with the cavity. The power tool further has a retention device including a bit engaging member disposed within the housing and operable to extend through the window and retain a bit within the cavity. The power tool still further has an actuator operable by a user externally of the housing to disengage the bit engaging member from a bit received in the cavity and, finally, a mechanical interconnection system operably coupled between the actuator and the retention device to actuate the retention device in response to the actuator, wherein the mechanical interconnection is disposed within the housing.

Abstract: A drive system for releasably interconnecting a motor shaft of a rotary hand held power tool and an input shaft of an attachment device. The system includes an elongated flexible drive shaft connected to the input shaft, wherein the flexible drive shaft has an outer end portion with a non-circular cross-section configured to engage a complementarily shaped cavity of an output shaft operatively attached to the power tool motor shaft, where the output shaft has a generally cylindrical outer configuration along its length and a rearward mounting portion for attachment to the motor shaft, an intermediate portion having the complementarily shaped cavity for receiving the flexible drive shaft and a forward portion with an enlarged concentric opening for receiving and guiding the outer end portion of the flexible drive shaft into the cavity during mounting the attachment device on the power tool.

Abstract: An impact mechanism comprises a drive engaging member and a tool bit retaining member. A hammer is mounted on the drive engaging member for guided movement between an anvil contact position whereat force is transmitted from the hammer to the anvil portion so as to create a moment about the longitudinal axis, and a release position whereat the hammer is temporarily removed from the anvil portion. A spring biases the hammer to the anvil contact position. A main body member has an internal thread and is threadably engaged on a co-operating external thread on the drive engaging member. The spring is operatively interconnected between the main body member and the hammer member, to thereby permit selective compression of the spring through rotation of the manually manipulable handle.

Abstract: A handheld power tool having a detachable tool head is disclosed in which, depending on the type of tool head used, selection of reverse movement of the rotary assembly of the power tool can be prevented. Where reverse movement of the tool head is undesirable, such as for a saw blade, the tool head contains a contact plate that slides a plate member to a position to prevent selection of the reverse direction by the user. However, where reverse movement of a tool head is desired, such as for a drill head, the plate member remains in its original position such that forward and reverse directions can be selected by a user.

Abstract: A handheld power tool that includes a base portion and one or more head portions that are designed to be removably connectable to the base portion. The base portion includes a base housing, an electric motor at least partially positioned in the base housing, a power supply removably connected to the housing, a top connection arrangement. The head portion includes a head housing, a first gear assembly, a second gear assembly, and a head connection arrangement. The first gear assembly has a first shaft that is rotatably positioned about a first longitudinal axis and a second gear assembly having a second shaft that is rotatable about a second longitudinal axis. The first and second longitudinal axis of the two gear assemblies are non-parallel to one another.

Abstract: A device for driving and extracting a post having a hollow barrel having one closed end and one open end for receiving the post, and two longitudinal handles, wherein at least one handle is pivotally fixed at the closed end of the barrel and releasably secured with a fastener at the other end such that said handle is utilised to facilitate driving of the post or can be released to act as a lever for extracting the post. The device also has a striker disc fixed within the barrel at the closed end with a void between the disc and closed end of the barrel to muffle the noise created during driving of a post.

Abstract: A system includes a power tool having a motor, a drive mechanism mechanically coupled to the motor, and an output element mechanically coupled to the drive mechanism. The motor is operable to drive the drive mechanism and the output element. The system also includes a non-motorized sensing tool having a printed circuit board and a sensing element electrically coupled to the printed circuit board. The sensing element is operable to detect an external characteristic and output a signal to the circuit board. The circuit board is operable to condition the signal into a human-comprehensible form. The system further includes a rechargeable battery pack removably and independently coupled to the power tool and the non-motorized sensing tool. The battery pack is operable to power the motor to drive the drive mechanism and the output element when connected to the power tool, and is operable to power the circuit board and the sensing element when connected to the non-motorized sensing tool.

Abstract: An alignment tool for aligning fence posts and a method for aligning fence posts are provided. The alignment tool can include an alignment plate with an aperture adapted to receive a fence post. The alignment plate is interconnected to a lever arm to facilitate the application of a torque to a fence post received by the aperture of the alignment plate at a desired location along the length of the fence post. The alignment plate can additionally include one or more notches adapted to receive an edge of a fence post. By applying a force through the lever arm, the portion of an edge of the fence post received by the notch can be crimped and/or otherwise aligned at a desired location along the length of the fence post. The lever arm can comprise a post pounder, resulting in a tool that is capable of performing multiple functions.

Abstract: An ergonomically enhanced electric power tool is disclosed that incorporates a new type of user grip and control system. This grip and control system is housed in a substantially rigid control-housing sheath, which provides enhanced leverage and control over the drilling process while reducing stress on the user's hand, wrist, and arm. The tool motor is disposed substantially in parallel with the user's wrist, but on a different plane, and eliminates the traditional “pistol” type of power-tool grip. The control-housing sheath contains a grip-controller assembly that allows the user to control most major drill operations within the gauntlet-like control-housing sheath. The inventive concepts described can be applied to myriad hand-held power tools, and a detailed example for a power drill is provided.

Abstract: A chisel adapter has both ends connected with a tool head and a drive tool, respectively, and comprises: a first sleeve, a slide bushing, a first fastener, an abutting member, a second sleeve, a first rod, and a second rod. The chisel adapter is convenient to use since it allows the user to replace the chisel by hand without using tools. Furthermore, the chisel adapter is improved in applicability since it is applicable to common drive tools.

Abstract: An anchor installation tool has an elongated member with a body portion and a head portion. The body portion includes an internal bore to receive a drill bit. The head portion projects from and has a diameter smaller than the body portion. The head portion is coaxial with the body portion. An anchor guide has a sleeve-shaped body with a bore throughout the body. The bore has a portion sized to fit over the body portion and a portion to fit over the head portion. The guide slides on the body and head portions. A mechanism retains the anchor guide onto the body portion. The retaining mechanism enables sliding of the anchor guide and prohibits removal of the anchor guide from the body portion.

Abstract: An impact drill includes a housing having an accommodation chamber and a through hole extending from the accommodation chamber to the outside space, a driving mechanism mounted in the accommodation chamber and having a transmission shaft positioned in the through hole for providing an output torque and producing an impact force intermittently upon a resistance, the transmission shaft having a polygonal front segment extending out of the accommodation chamber, and a chuck unit, which has a drill chuck that has a connection barrel defining a polygonal coupling hole that is press-fitted onto the polygonal front segment of the transmission shaft and a first bearing mounted on the connection barrel and received in the through hole to secure the drill chuck to the housing.

Abstract: An attachment for a portable power tool includes an output shaft having a tool receptacle for accommodating an application tool, a locking unit which can be releasably attached to a housing of the portable power tool, and an input shaft which can be connected to a drive shaft of the portable power tool in a rotationally fixed manner. The attachment has a torque converter for converting a first torque which acts on the input shaft into a second torque which acts on the output shaft.

Abstract: Embodiments of the present invention are directed to a drive system for releasably interconnecting a motor shaft of a rotary hand held power tool and an input shaft of an attachment device that is mounted thereon, the system comprising, an elongated flexible drive shaft connected to the input shaft of the attachment device, the flexible drive shaft having an outer end portion with a non-circular cross-section configured to engage a complementarily shaped cavity of an output shaft operatively attached to the power tool motor shaft, an elongated output shaft operatively connected to the motor shaft of the power tool, the output shaft having a generally cylindrical outer configuration along its length and having a rearward mounting portion for attachment to the motor shaft, an intermediate portion having the complementarily shaped cavity for receiving the flexible drive shaft and a forward portion with an enlarged concentric opening for receiving and guiding the outer end portion of the flexible drive shaft into

Abstract: A power tool includes a tool unit having an electric motor for driving a tool bit, and a first base and a second base each capable of being assembled with the tool unit. The tool unit and the first base can be assembled into a first tool. The tool unit and the second base can be assembled into a second tool that is different from the first tool.

Abstract: A main shaft locking mechanism includes a fixing ring, a main shaft and detents. The main shaft includes an equilateral portion that has an equilateral cross section. A number of the corners of the equilateral portion is equal to that of the detents. The detent has an exterior side and an interior side opposite to the exterior side. The interior side includes two corner protrusions protruded out from two ends thereof and a concave portion defined between the two corner protrusions. The corners of the main shaft are received in the concave portions of the detents. When the main shaft is manually driven to rotate, the corners of the main shaft drive the detents to deviate. Therefore, the exterior sides of the detents interfere against the fixing ring. Then the detents prevent the main shaft from further rotating, thus locking up the main shaft.

Abstract: A hand power tool, in particular a drill hammer and/or chisel hammer, has a housing, a first joining unit, and a switch device that has an actuating unit with a second joining unit corresponding to the first joining unit, the actuating unit being capable of being introduced without tools, by the second joining unit, into the first joining unit in a mounting position. The first joining unit and the second joining unit of the actuating unit are provided to perform protection of the actuating unit against being lost, in an installed state of the actuating unit.