Abstract: The invention relates to a hand-held power tool, especially a rotary hammer and/or chisel hammer. The hand-held power tool is provided with a vibration dampening unit having a first absorber mass unit with a first vibration dampening direction and at least one second absorber mass unit with a second vibration dampening direction. The hand-held power tool in particular has the first vibration dampening direction of the first absorber mass unit disposed as substantially parallel to the second vibration dampening direction of the second absorber mass unit.

Abstract: An auxiliary handle for a motor-driven hand tool has a mounting device which forms an upper region and provides a force-transmitting and/or form-locking connection to a hand tool; a handle forming a lower region, a damping element forming an intermediate region and located at least locally between the mounting device and the handle, the damping element having a damping material with which, during an operation of a hand tool, it dampens vibration transmitted through the mounting device to the handle, the damping element in its damping region acting for damping having at least one reinforcing region that has a lower deformability than a remaining part of the damping region and during deviations of the handle in at least two different directions relative to the mounting device causes differently great elastic counter forces.

Abstract: An improved vibration dampening system has been developed for handheld electrical power tools. The vibration dampening system includes a material that a controller selectively activates with an electrical current to increase the rigidity of the material and dampen random vibrations detected by the controller. The material is positioned between a foot member that helps support the tool against a work piece and both hand grips for the tool. Thus, the vibration dampening system reduces the impact of random vibrations on both hands of an operator.

Abstract: A plurality of components of a power tool are coupled to each other to form a component assembly. Positioning members are disposed within a housing body and resiliently support the component assembly from opposite sides in an axial direction.

Abstract: An impact tool is provided with a rational structure of connecting a ring-like member and a counter weight. The impact tool has a tool body, a motor, a drive shaft, a ring-like member that is caused to swing in an axial direction of a tool bit by rotation of the drive shaft, a tool driving mechanism, that is connected to the ring-like member and caused to rectilinearly move in the axial direction of the tool bit, and a counter weight that reduces vibration caused in the tool body in the axial direction of the tool bit. The counter weight has a connecting part that comes in contact with an outer edge of the ring-like member in at least one of axial directions of the tool bit, and the counter weight is connected to the ring-like member via the connecting part.

Abstract: A hammer drill having a housing and a rear handle moveably mounted to a rear of the housing by means of at least one movement control mechanism is disclosed. A bellows is fixed to the handle and slidably mounted to a protrusion on the housing to prevent access to the movement control mechanism.

Abstract: An electric power tool can include a main body, which rotates a motor with a pull operation of the switch lever and actuates a head tool by a rotative force of the motor, and an auxiliary tool configured for attaching and detaching to and from the electric power tool main body. In the main body, an actuating part actuated with the pull operation of the switch lever is provided. The auxiliary tool includes a detecting part, which noncontactly detects an actuation of the actuating part, and an electric circuit section for actuating electric devices, provided in the auxiliary part, by a detecting actuation of the detecting part.

Abstract: A power tool having a housing divided into two parts which are interconnected by a thread joint. Internal threads are provided on the housing parts. A tubular connection element has two external axially spaced thread sections which are provided for engagement with the internal threads on the housing parts. The tubular connection element has a thin walled waist section located between the external thread sections to provide a certain elastic deformation as a tightening torque is applied on the thread joint to thereby increase the clamping length of the thread joint. A resilient ring is carried on the waist section and is arranged to be elastically deformed by squeezing between the housing parts and the connection element at tightening of the thread joint, thereby providing a rotation locking friction force on the thread joint.

Abstract: A hammer-drill including a body in which is mounted a motor and a hammer mechanism which is driven by the motor; a tool holder mounted on the front of the body and which is capable of holding a cutting tool, the hammer mechanism being capable of imparting impacts to the cutting tool, when held by the tool holder; a rear handle, moveably mounted onto the rear of the body via at least one movement control mechanism and which is capable of moving towards or away from the body; a biasing mechanism which biases the rear handle away from the body.

Abstract: A portable hand-held power tool (2), especially in the form of a drilling or chisel hammer, includes a drive assembly (8) located in the tool housing (10) for driving a tool spindle (4) along an operational axis (A), a first handle (16) which is rotatable around a first pivotal axis (S1) by a first handle suspension (22), a second handle (20) located on the opposite sides (14.1, 14.2) of the housing which is rotatable around a second pivotal axis (S2) by a second handle suspension (24), and spring elements for retaining the handles (16, 20) in their initial position, with the first and second handle suspensions (22, 24) extending partially circumferentially about the drive assembly (8).

Abstract: A hand-power tool includes at least one oscillation-damping device that has at least one damping spring and a damping mass. The hand-power tool also includes a drive mechanism and a mechanism housing. The mechanism housing has a housing cover which is provided for closing a chamber in which the drive mechanism lies, and the housing cover has at least one fixing mechanism that at least partially fixes the oscillation-damping device in at least one operating state.

Abstract: A handle assembly for a power tool is disclosed. The handle assembly includes a base adapted to be mounted to a body of a power tool, and a handle having first and second mounting portions pivotably mounted to respective ends of the base. An elongate torsion spring has a first part mounted to the base and a respective second part mounted to each mounting portion such that pivoting of the handle relative to the base member causes twisting of the torsion member to resiliently oppose pivoting of the handle relative to the base portion.

Abstract: A mounting apparatus for mounting a handle to a power tool is disclosed. The apparatus comprises a base for supporting a handle and engaging a body of the power tool, a flexible strap for engaging the base at first and second locations to form a loop for retaining the support in engagement with the body of the power tool, and a clamping mechanism comprising a pair of wedges for engaging the base and the flexible strap, and a bolt for retaining the wedges in position relative to the base. A knob enables movement of the wedges relative to each other in a first direction to reduce the size of the loop and in a second direction to increase the size of the loop.

Abstract: A hand-held power tool is proposed, having a drive device for driving a tool, which is arranged in a housing of the power tool. A handle of the power tool, which is movably connected to the housing of the power tool, is vibration-damped by a movable compensating element. For this purpose, the movable compensating element is operatively connected to the handle and/or the housing of the power tool by a deflecting system.

Abstract: A hand-held power tool is provided which includes a drive unit in a housing, a switch device, and elastomer elements. The drive unit is configured to be switched on and off with the switch device which comprises a switch accommodated inside the housing. The elastomer elements are molded onto the outside of the housing and onto the inside of the housing and are connected to each other via an opening in a wall of the housing. An elastomer element on the inside of the housing forms an elastomer bearing configured to support the switch.

Abstract: The invention relates to a vibration damper for a machine component which vibrates in the operating state thereof, wherein a damping mass arrangement is coupled to the machine component via a clearance and wherein the excitation of the damping mass arrangement in at least one vibration direction originates from a substantially shocklike interaction between the damping mass arrangement and the machine component. The invention leads to an increase in dampening efficiency due to the utilization of shock-like transfer of vibration energy.

Abstract: A hand-held power tool has a main element having a tool axis, a center of gravity, and a normal axis which extends perpendicular to the tool axis and through the center of gravity. The tool axis and the normal axis define a plane of motion. A handle supported in the plane of motion such that it is movable relative to the main element. A spring unit connects the handle with the main element and includes a spring element. The handle has a handle body, a rotary element which connects the handle body and the main element. The rotary element is rotatable relative to the main element and to the handle body.

Abstract: A reciprocating power tool and drive mechanism with a drive shaft mounted for reciprocating movement relative to a housing along a center longitudinal axis of the drive shaft. The drive shaft has a front end adapted to attach to an external shaft or tool attachment, a rear end, and a slot oriented perpendicular to the center longitudinal axis of the drive shaft between the front and rear ends. A motor driven shaft imparts rotary movement to a pinion gear, which meshes with a crown gear to impart rotary motion to the crown gear about its center axis. A drive pin connected to the crown gear has an eccentric pin eccentrically offset relative to the center axis of the crown gear for engagement in the slot of the drive shaft so as to impart the reciprocating movement to the drive shaft on rotation of the crown gear.

Abstract: A technique for making a handle vibration-proof while avoiding size increase is provided in an impact tool. The impact tool has a striking mechanism part for driving a tool bit in its axial direction, a motor for driving the striking mechanism part, a tool body housing the motor and striking mechanism part, an outer shell housing covering part of the tool body, a handle that is integrally formed with the outer shell housing and extends transversely to the axial direction, a first handle end portion formed on one extending end of the handle, a second handle end portion formed on the other extending end of the handle, a first elastic element that connects the first handle end portion and tool body for relative movement in the axial direction, and a second elastic element that connects the second handle end portion and tool body for relative movement in the axial direction.

Abstract: An electric tool includes a vibratory means which is configured to impart a counteracting vibration which counteracts a housing vibration of the electric tool. A vibration-relevant characteristic of the vibratory means can be adapted during the operation of the electric tool in such a way that the amplitude, the phase position and/or the frequency of the counteracting vibration varies with a change in the vibration-relevant characteristic. The vibratory means of the electric tool has a natural frequency which can be varied by variation means of the electric tool. A method for compensating housing vibrations, in particular of the electric tool, includes imparting a counteracting vibration by a vibratory means which counteracts a housing vibration of the electric tool. The amplitude, the phase position and/or the frequency of the counteracting vibration is varied during the operation of the electric tool.

Abstract: The absorber for a hand machine tool according to the invention with a linear drive has a case and a body of mass moveable alongside of an absorber axis relative to the case. Force is applied toward a first direction to a first coupling element moveable alongside of the absorber axis, which is coupled with the body of mass using a first spring. Force is applied toward a second direction to a second coupling element moveable alongside of the absorber axis using a second spring coupled with the case. With a movement toward the first direction, the first coupling element is frictionally coupled with the second coupling element and with a movement toward the second direction, it is uncoupled from the second coupling element.

Abstract: A hand-power tool includes at least one oscillation-damping device that has at least one damping spring, a damping mass, and a mechanism housing. The oscillation-damping device has at least two retaining parts that at least partly enclose the damping mass.

Abstract: Gel-like material or viscoelastic polymer is placed in a portion having a three-dimensional shape. A power tool driving force transmission mechanism transmits a rotary driving force from a rotary drive source to operate the power tool; and a housing provides an outer shell for the power tool. A tail cover is provided at at least a region of the housing, held by an operator; and gel-like material, enclosed by a resin film into a gel pack, is placed between the tale cover and the housing. The tail cover is composed of an elastomer member and a resin member, which is integrally formed with the elastomer member and has a higher hardness than the elastomer member. A portion receiving the gel pack is composed of the elastomer member, and a portion connected to the housing is composed of the resin member. The gel pack may be substituted with viscoelastic polymer.

Abstract: An electric tool includes a striking mechanism assembly, which can be driven in and against a striking direction in a cyclic manner, and a counter-oscillator for compensating for vibrations of the electric tool, in particular of housing oscillations, comprising a balancing mass. The balancing mass can be driven in a movement direction by driving the striking mechanism assembly, wherein the movement direction extends at an angle to the striking direction.

Abstract: It is an object of the invention to provide a fatigue reducing structure in a hand-held power tool. A representative screwdriver 100 includes a body 101, an anvil 106, a driver bit 110, a driving motor 120, a handgrip 130, a trigger 131, a rear end groove 109 pressed forward toward the driver bit 110, while being held with first and second fingers of user's hand on a housing rear end 101a side of the body 101, a circular arc portion 130c having a horizontal section of a circular arc shape on a rear end of the handgrip 130 and a middle portion 109b having a horizontal section of a circular arc shape on a housing rear end 101a side of the holding part, which circular arc shape has a curvature larger than that of the circular arc shape of the first circular arc portion.

Abstract: An electric hammer comprising a hammer bit performing hammering work on a work, a drive motor, a hammering piece driven by the drive motor to apply a hammering force to the hammer bit, and a mechanism for damping vibration generated during hammering. The damping performance of the electric hammer is enhanced by causing the driving amount applied to the damping mechanism to vary between a first mode where the damping mechanism generates vibration of the hammer bit subjected to an external force from the work during the load driving time and thereby optimizes the damping and a second mode where the damping mechanism generates vibration corresponding to the vibration of the hammer bit not subjected to an external force from the work during the no-land driving time and optimizes damping.

Abstract: This invention provides an auto hammer comprising a housing, a head assembly including a striking device and transmission mechanism. The striking device includes a striking rod having a striking end. The transmission mechanism includes an impact wheel. The distance from the end surface of the striking end of the striking rod to the center of the impact wheel between 40 mm and 100 mm. This distance is arranged very small, in favor of the hammer being used in some narrow spaces. The auto hammer according to this invention meets the requirements of being used in narrow spaces by hands, thereby suitable for use in various circumstances.

Abstract: A damper for mounting between a power tool, having an axis of vibration, and a handle. The damper includes a damping arrangement for damping impacts and a spacer. The spacer is dimensioned so that, when the damper is mounted to the power tool, a ratio of a first distance between the axis of vibration and the handle to a second distance between the axis of vibration and the damping arrangement is at least 2:1. Further, a handle having such a damper for a power tool, as well as the corresponding power tool having such a handle, are described.

Abstract: A vibration reduction handle includes: a handle body attachable to a disk grinder; a grip portion which extends in a first direction defined as a longitudinal direction of the grip portion and is pivotably movable in a second direction crossing the first direction; and a first vibration reduction rubber and a second vibration reduction rubber which are respectively provided between the handle body and the grip portion.

Abstract: The invention relates to a hand-held tool, in particular a rotary hammer, a percussion hammer, or a sabre saw. The hand-held tool is equipped with a drive unit and a stroke-generating element; the drive unit is embodied to move the stroke-generating element in a reciprocating fashion along a translation axis. The hand-held tool has at least one counterweight; the counterweight is operatively connected to the drive unit in such a way that it is possible to at least partially compensate for forces at least indirectly caused by the reciprocating motion. According to the invention, the counterweight in the hand-held tool is supported so that it is able to move, in particular to reciprocate, coaxial or parallel to the translation axis.

Abstract: The present invention concerns a handheld working tool comprising a motor part (10), a handle part (20) comprising a handle grip (21), and at least one first type antivibration element (30) arranged between said motor part (10) and said handle part (20), and which element (30) is adapted to isolate the handle part (20) from vibrations in the motor part (10). The working tool (1) is characterized in that it further comprises at least one second type antivibration element (40) arranged adjacent to the first type antivibration element (30). The at least one second type antivibration element (40) is adapted to, when in an active state, prevent vibrations in the motor part (10) from being transferred to the handle grip (21). The second antivibration element (40) is in the active state when the handle grip (21) is loaded during operation of the working tool (1).

Abstract: Improving vibration reduction of a handle in a hand-held power tool by performing a predetermined operation on a workpiece by linear movement of a tool bit in an axial direction. The power tool includes a power tool body, a handle and a vibration-proofing part. The vibration-proofing part includes an elastic element that is disposed between the power tool body and the handle and reduces transmission of vibration from the power tool body to the handle, and also includes a body-side receiving part and a handle-side receiving part which are opposed to each other so as to hold the elastic element. The vibration-proofing part is designed such that deformation of the elastic element is shearing deformation in each of the direction of a z-axis defined along the axial direction of the tool bit and the directions of a y-axis and an x-axis which intersect with the z-axis.

Abstract: A power-driven hammer including a body including a tubular housing and a barrel assembly received in the housing. The barrel assembly has an at-rest position relative to the housing. The barrel assembly includes a barrel having a forward end adapted to hold a tool, an opening, and a rearward end. The barrel assembly includes a mass received in the opening of the barrel. The mass moves in the barrel opening when the hammer is operating through a power stroke and a return stroke. The barrel assembly moves forward and rearward from its at-rest position relative to the housing when the hammer is operating. The hammer includes a vibration reducing mechanism connecting the barrel assembly to the body reducing shock transmitted to the housing as the mass moves forward and rearward in the barrel.

Abstract: A handle housing for a handle for a power tool, the handle housing having a first housing part; and a second housing part adapted to be mounted to the first housing part and subjected to a bending stress when mounted to said first housing part, the said first and second housing parts defining a chamber for accommodating one or more components of the power tool.

Abstract: A power tool capable of performing vibration damping action in working operation, without an increase in size. The working tool includes a motor, a housing in which an internal mechanism driven by the motor is stored, a tool bit disposed on one end of the housing, a hand grip continuously connected to the other end of the housing, and a dynamic damper. The dynamic damper is disposed by utilizing a space between the housing and the internal mechanism so that the damping direction of the dynamic damper faces the longitudinal direction of the tool bit.

Abstract: A motor unit has a tool for engaging a work piece with a frame unit, which has a gripping element for the handheld operation of the device, wherein a mechanical coupling is provided between the motor unit and frame unit, which encompasses at least one dampening element, in such a way that makes it possible to precisely guide the tool while improving the dampening of vibrations between the motor unit and frame unit. The frame unit has at least one abutting element, against which the motor unit abuts when a working force exerted by the work piece on the tool has a value below a minimum value.

Abstract: A manually guided implement, such as a power saw, a cut-off machine, or the like, having a drive motor for driving a tool of the implement. The drive motor has a drive shaft that is rotatably driven about an axis of rotation. The implement has a handle on which is disposed at least one control handle for the drive motor. Formed between the handle and the drive motor is a vibration space that is spanned by at least one anti-vibration element, at least one of which includes a coil spring, the longitudinal axis of which is disposed approximately perpendicular to a longitudinal plane of the implement. The vibration space is spanned by at least one connecting element, the longitudinal axis of which is inclined relative to a transverse plane of the implement that is disposed perpendicular to the longitudinal plane.

Abstract: A hand power tool has a housing; at least one handle having at least one gripping part; at least one elastic, vibration-damping element; a mounting part mounted on the elastic element; the gripping part being mounted on the housing through the elastic element and through the mounting element; and at least one movable safety element through which the gripping part is connected with the mounting part.

Abstract: A handheld work apparatus has a drive motor (8) that is held in a motor housing (2). At least one handle (4) is provided, with a vibration gap (12) being formed between the handle (4) and the motor housing (2). The vibration gap (12) permits a relative movement between handle (4) and motor housing (2). The handle (4) is connected to the motor housing (2) via at least one anti-vibration device (13, 14, 15, 16, 31, 49, 50, 63) that bridges the vibration gap (12). The anti-vibration device (15, 16, 31, 49, 50, 63) has a longitudinal center axis (23, 24). The anti-vibration device (15, 16, 31, 49, 50, 63) bridges the vibration gap (12) via at least one tension element. The anti-vibration device (15, 16, 31, 49, 50, 63) also has a spring (17, 32, 33, 51, 55, 72, 73) arranged functionally in series with the tension element.

Abstract: A power tool for performing a predetermined operation by using a tool driven by a motor including a first housing to which the tool is attached at an end of the first housing and which has a cylindrical portion of the first housing, a second housing which has a cylindrical portion of the second housing covering the cylindrical portion of the first housing, and a vibration reduction member which is provided between the cylindrical portion of the first housing and the cylindrical portion of the second housing and which reduces transmission of vibration between the first housing and the second housing via elastic shearing deformation of the vibration reduction member. A direction of the shearing deformation of the vibration reduction member corresponds to a direction of a rotation axis of the motor.

Abstract: A pistol and/or clam shell style power tool housing. With respect to the pistol style housing, the tool housing includes a body defining a head portion with a handle portion depending therefrom to define a forward and/or a rear junction. A metal reinforcing member is configured to span along an inside surface of the body from the head portion to the handle portion such that the reinforcing member bridges either the forward or rear junction. In at least one embodiment, the reinforcing member is provided along each lateral side of the tool body. With respect to the clam shell style housing, with two opposed body halves interconnected to define the tool housing body, at least one continuous reinforcing ring is positioned about both halves of the tool housing body to prevent splitting between the two halves.

Abstract: A handheld power tool has a housing having two separate housing parts, between which a primary damping element is disposed, wherein a secondary damping element is disposed acting parallel to said primary damping element. During regular function of the primary damping element, the secondary damping element is at least approximately force-free. In the event of a changed relative position between the two housing parts, the damping occurs via the secondary damping element.

Abstract: An impact hammer with pre-pressing damping and buffering effect includes a handle, outer barrel, air inlet, internal slide, actuating cylinder, air flow switching module and air inlet coupling portion. A front damper is assembled between the front end of the internal slide and the front end wall of the holding space and is characterized by a two-section pre-pressing rear damper assembled between the rear end of the internal slide and the rear end wall of the holding space. The two-section pre-pressing rear damper includes superposed upper and lower elastic buffers. At least the lower elastic buffer is pressed by a pre-pressing member to the preset degree. When the impact hammer yields recoil force under the impaction of the piston, the pre-pressing rear damper is employed to realize stronger buffering effect, so that the impact force is not much affected, thereby improving the impact efficiency and yielding excellent buffering effect.

Abstract: It is an object of the invention to provide a technique that contributes to further improvement of an impact tool. A representative impact tool includes a motor, a tool body that houses the motor, a dynamic vibration reducer and a driving mechanism part that is driven by the motor and forcibly drives the dynamic vibration reducer by applying an external force other than vibration of the tool body to the dynamic vibration reducer, during hammering operation. At least one of the dynamic vibration reducer and the driving mechanism part is mounted to the tool body in a form of an assembly into which at least one of a plurality of component parts forming the dynamic vibration reducer and a plurality of component parts forming the driving mechanism part are assembled in advance.

Abstract: An improved hand-held power tool is provided which can effectively reduce whirling vibration caused by imbalance of a rotating element. The power tool has a grip that is connected to a tool body and designed to be held by a user and a self-synchronous mechanism that reduces whirling vibration caused in the tool body or the grip when the tool bit is driven. The self-synchronous mechanism is of a phase variable type, having a rotating body which serves as a vibrator and is rotationally driven by a driving source different from a driving source for the tool bit. The self-synchronous mechanism is disposed in the tool body or the grip in which whirling vibration is caused, and arranged such that a phase of vibration of the rotating body is automatically tuned to a phase of the whirling vibration, thereby reducing the whirling vibration.

Abstract: A hand-held machine tool having a linear drive for moving a tool along a working axis, e.g. a motor-driven pneumatic driving tool, is provided. At least two dampers are provided in the hand-held machine tool for damping vibrations along the working axis. A resonant excitation of a vibration of the first damper along the working axis occurs at a first resonance frequency, which differs from a second resonance frequency of the second damper for the vibration along the working axis.

Abstract: A hand-held rotary tool is provided which can offer improved usability while realizing reduction of vibration of a tool body. The rotary tool has a tool body, a drive shaft disposed in the tool body, a driven shaft to which a tool bit is attached, an Oldham's coupling that transmits rotation of the drive shaft to the driven shaft, and an elastic element disposed between the driven shaft and the tool body. The driven shaft is prevented from moving in a longitudinal direction of the driven shaft relative to the tool body and allowed to move in a direction transverse to the longitudinal direction of the driven shaft relative to the tool body. During this relative movement, power transmission from the drive shaft to the driven shaft is maintained via the Oldham's coupling. The elastic element absorbs the movement of the driven shaft relative to the tool body.

Abstract: A power tool according to the invention includes a dynamic vibration reducer having a body, a weight and elastic elements. The body is formed by a plurality of cylindrical members which are coaxially disposed to face each other. The elastic elements exert biasing forces on the cylindrical members such that the cylindrical members are held apart from each other. The cylindrical members are fixed to the tool body side under the biasing forces of the elastic elements. Venting members for forced vibration are provided on the cylindrical members and protrude radially outward from the cylindrical members, respectively. The venting members are mounted by inserting into venting member mounting parts on the tool body side in a direction transverse to the longitudinal direction of the cylindrical members. At least one of the venting members can move with respect to the cylindrical member in the longitudinal direction.

Abstract: A hand-held power tool has a housing comprising at least two separate and interconnected housing parts, wherein one housing part forms a handle part for holding and guiding the hand-held power tool. At least two vibration reduction elements are arranged in the force transmission path between the housing parts.

Abstract: A hand-held power tool has a housing including at least two separate and interconnected housing parts, wherein one housing part forms a handle housing for holding and guiding the hand-held power tool. The handle housing includes a handle and a fastening component. The fastening component is connected to the other housing part and to the handle, and a vibration reduction element is arranged between the fastening component and the handle.