Abstract: Embodiments are disclosed for a reciprocating saw that comprises a housing, a drive mechanism in the housing, a motor in the housing for driving the drive mechanism, an elongated plunger located in the housing for reciprocating motion and having a front end portion for attaching a saw blade for cutting material, the saw having an energy absorbing compliant configuration at least partially isolating a portion of the plunger and the drive mechanism from high energy impulses that can be produced by the saw blade being bound in the material being sawed during operation of the saw.

Abstract: A power tool includes: a power tool main body; a handle holder protruding from the power tool main body; a handle extending in a protruding direction of the handle holder and having an arm portion engaging the handle holder; and an elastic body carried between the power tool main body and the handle. The handle holder has a spherical convex outer circumferential face. The arm portion surrounds the handle holder and has a spherical concave inner circumferential face. The convex outer circumferential face of the handle holder is inserted and fitted into the concave inner circumferential face. The elastic body is carried between the power tool main body and the handle around the outer circumference of the handle holder in a radial direction vertical to a protruding-direction central axis of the handle holder.

Abstract: An electric hammer comprising a hammer bit (313) performing hammering work on a work, a drive motor, a hammering piece (334) driven by the drive motor to apply a hammering force to the hammer bit, and a mechanism (371) 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 (371) to vary between a first mode where the damping mechanism (371) generates vibration of the hammer bit (313) 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 (371) generates vibration corresponding to the vibration of the hammer bit (313) not subjected to an external force from the work during the no-land driving time and optimizes damping.

Abstract: A hand-held power tool includes a pneumatic percussing mechanism (3) located in the power tool housing (2) and having an anvil (5) and a percussion piston (4) for applying blows to the anvil (5), and at least one oscillation damper (6, 6?) including an oscillation damping mass (7, 7?), at least one spring (8a, 8a?) for compressively preloading the damping mass (7, 7?) against the power tool housing (2), and an axially displaceable excitation member (9) for actively exciting the oscillation damper (6, 6?) in response to the anvil (5) occupying an operational position.

Abstract: A power tool includes an inner housing (50) at least partially housed within and spaced from an outer housing (30). The inner housing supports a tool (102, 302), such as a pair of shear blades, and houses a motor (80) that drives the tool. The outer housing includes a grip (14, 18) to be grasped by a user. At least one vibration insulator (71-75) can be disposed between the inner housing and the outer housing and in a manner such that the vibration insulator(s) is(are) protected by the outer housing. An intake opening (60a, 60b) and exhaust opening (64a, 64b) can be formed in the inner housing and can be shielded by respective portions of an inner surface of the outer housing.

Abstract: Described is an anti-vibratory handle for installation on a reciprocating tool supplied with a pressurized fluid and producing vibrations in the direction of an axis of reciprocation of the tool. The anti-vibratory handle comprises a stationary portion mounted to a body of the tool, a mobile portion comprising a hand-grip member and an articulation between the stationary and mobile portions. This articulation comprises a pivot assembly interconnecting the stationary and mobile portions, the pivot assembly defines a pivot axis substantially perpendicular to the tool reciprocation axis, and the hand-grip member of the mobile portion is spaced apart from both the pivot axis and the tool reciprocation axis. The articulation also comprises a resilient vibration-damping assembly interposed between the stationary and mobile portions to avoid transmission of vibrations through the articulation.

Abstract: The invention relates to a hand-held machine tool for driving a bit which can be accommodated in a tool holder, with a rotary and/or hammer action. The machine tool includes a drive train which has a drive side associated with a drive unit and a driven side associated with the tool holder. According to the invention, the hand-held machine tool has at least one decoupling unit that is used to form a rotationally elastic coupling between the drive side and the driven side.

Abstract: A reciprocating tool (1) includes a housing (20, 30), a driving source (21), a reciprocation conversion unit (34, 36), —and a vibration reduction mechanism (30). The driving source is accommodated in the” housing. The reciprocation conversion unit (34, 36) is supported by the housing and is configured to convert a driving force of the driving source into a reciprocating motion for providing a tool bit (16) movably supported to the housing with a reciprocating motion. The vibration reduction mechanism (70) includes a shaft (72), a weight (71), a support member (73), and a urging portion (74). The shaft i(72)s supported by the housing and extending in a direction perpendicular to directions of the reciprocating motion of the tool bit (41) t and has an axis. The weight (71) is located away from the shaft (72) and is swingable in a swinging direction. The support member (73) swingably supports the weight (71) about the axis of the shaft (72).

Abstract: A power tool, particularly a hammer drill, comprising; a body (4); a drive mechanism located within the body; at least one handle (10) moveably mounted on the body (4) by at least one connection point (18, 32; 16, 34); a vibration dampening mechanism connected between the body (4) and the handle (10) which reduces the amount of vibration, generated by the operation of the drive mechanism, being transferred from the body (4) to the handle (10); wherein the vibration dampening mechanism comprises a dampener (56); characterised in that the vibration dampening mechanism further comprises a restraining mechanism (52; 54) which restricts the direction of the movement of the handle (10) at the connection point (18, 32; 16, 34) where it mounts to the body to substantially the direction of the dominant vibration experienced by that connection point (18, 32; 16, 34). The restraining mechanism can comprise a pivotal lever or slide.

Abstract: An electrical power tool includes a housing, an electrical motor, a motion conversion mechanism, a weight-supporting member, a counterweight, and a first supporting member and a second supporting member. The first supporting member and the second supporting member are each provided on the housing for supporting the weight-supporting member to the housing. The weight-supporting member has a first connecting part and a second connecting part supported by the first supporting member and the second supporting member, respectively; and an elastically deforming part. The elastically deforming part is positioned between the first connecting part and the second connecting part and has a mounting part for mounting the counterweight. The elastically deforming part includes a portion having a smaller cross-sectional area than each cross-sectional area of the first connecting part and the second connecting part.

Abstract: A motor-driven machine tool with a drive shaft and a driven shaft on which the tool is received comprises an eccentric coupling device via which the rotational movement of the drive shaft is transmissible onto the driven shaft. A mass balancer shaft is provided for compensating vibrations. Said mass balancer shaft is operatively connected to at least one of the shafts and carries out a compensating movement counter to the eccentric coupling movement.

Abstract: The present invention provides a breaker mounting bracket a breaker mounting bracket for mounting a breaker body on a distal end of an arm of a working machine or the like. The breaker mounting bracket includes left and right side plates which are arranged to face each other in an opposed manner, an end plate which is provided between proximal end portions of both side plates and forms a connecting portion with a distal end of the arm of the working machine, and resilient bodies which come into contact with and support the breaker body and are mounted on inner sides of the left and right side plates and the end plate.

Abstract: Disclosed is a drilling and/or striking hammer that includes a lubricating device having a lubricant reservoir and a volume of lubricant contained therein. The lubricating device conveys lubricant to at least one a transmission system within the hammer's housing, a percussion system, and/or a tool holder at a variable dosing or flow rate. The dosing or flow rate varies as a function of tool stress which can include use intensity and/or temperature. A flexible tube extends between the reservoir and the lubricated component(s). At lease part of the flexible tube vibrates with the lubricated components during use and modifies a viscosity of the lubricant therein, based on tool use intensity. A pressure generating device can pressurize the lubricant, helping convey the lubricant to a targeted area for lubricating movable parts.

Abstract: A powered hand tool comprising a pneumatic motor including a cylinder, a main body formed as a hollow tube member, a main body rear end being formed with a fluid inlet and a fluid outlet, the main body being axially disposed for engagement with the pneumatic motor, a main body front end with an interior surface fitted for engagement with a lock nut, the pneumatic motor having a rotary shaft axially extending out of the main body front end wherein the diameter of the pneumatic motor is smaller than the diameter of the hollow tube member, an internal isolation layer composed of a vibration isolation material placed in the hollow tube member so that the vibration isolation material is engaged with and adjacent the ends of the hollow tube member and the pneumatic motor.

Abstract: The invention provides a power tool which includes a tool bit, a first operating mechanism that linearly drives the tool bit and thereby causes the tool bit to perform a predetermined operation, and a dynamic vibration reducer 151 that reduces vibration in the operation of the tool bit. The dynamic vibration reducer includes a weight 153 that can linearly move under the action of biasing forces of a plurality of biasing springs 157 acting upon the weight 153 toward each other. The weight 153 is driven by a second operating mechanism 116 that mechanically excites at least one of the elastic elements, via the elastic element.

Abstract: A fastener driving device includes a fastener driver, a magazine for carrying a supply of fasteners to the fastener driver, a spring that moves the fastener driver through a drive stroke, and a motor configured to move the fastener driver through a return stroke. The motor is operable upon completion of the drive stroke, to move the fastener driver partially through the return stroke a predetermined amount to partially pre-compress the spring. The motor is further operable to fully compress the spring after receiving a signal for the drive stroke.

Abstract: It is an object of the invention to provide a technique for further improving the vibration reducing performance in a power impact tool that linearly drives a tool bit by using a swinging mechanism. According to the invention, a representative power impact tool is provided with a motor, a rotating shaft, a swinging member, a tool driving mechanism and a counter weight. The swinging member is supported by the rotating shaft to swing in the axial direction of the rotating shaft by rotation of the rotating shaft. The counter weight is disposed in a region higher than a lower end region of the swinging member in the vertical direction to intersect with the axis of the rotating shaft, and a lower end of the counter weight is connected to the lower end region of the swinging member.

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 antivibration unit of a portable handheld work apparatus includes a leg spring (3) having at least one wire turn (5) and at least one first wire leg (6). The wire turn (5) extends about a turn or coil axis (4) and is attached at the first component assembly (1) and the first wire leg (6) extends outwardly and tangentially from the wire turn (5). A wire leg end (7) of the wire leg (6) is attached to the second component assembly (2).

Abstract: A damping device for inserting into a housing of an impulse producing drill machine, for damping Shockwave reflexes from a drill string connected to the drilling machine, is distinguished in that a first damping piston (7) for direct or indirect action against the drill string and for applying a pressure in the direction of the drill string an a second damping piston (9) for applying pressure in the direction against the drill string against a fixed stop (11) arranged in the housing, wherein the first (7) and the second damping piston (9) are arranged to co-operate for joint damping action with a drill bushing or shank adapter in a certain relative position. The invention also concerns a drilling machine.

Abstract: A tool housing which in one aspect 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 another aspect, the tool assembly comprises a tool housing body, a motor positioned within the tool body housing, a drive mechanism connected with the motor to define a unitary motor/drive mechanism assembly, and at least one elastic isolating member extending about a portion of the motor/drive mechanism assembly such that the motor/drive mechanism assembly is elastically isolated relative to the housing body.

Abstract: A mounting assembly for moveably mounting a handle of a power tool to a housing of the power tool is disclosed. The mounting assembly has a metal bar (324) mounted to a housing (290) of the power tool and a vibration damper (332) mounted to a handle (294) of the power tool and slidably mounted to the metal bar. The vibration damper includes a vibration damping member (344) for damping vibrations tending to cause the vibration damper to pivot relative to the metal bar about an axis substantially parallel to the longitudinal axis of the metal bar.

Abstract: A vibration reduction apparatus for use with a hammer tool having a hammer piston is disclosed. The hammer piston is caused to reciprocate in the cylinder by rotation of a gear wheel and crank drive. A cam is mounted around the gear wheel, a counterweight surrounds the piston cylinder, and a cam follower is provided on the counterweight. The cam follower on the counterweight is urged into contact with the cam by a biasing element. The external profile of the cam is such that rotation of the gear wheel causes oscillation of the counterweight in antiphase to motion of the hammer piston to counteract vibrations produced by operation of the hammer action of the tool. A mechanism is provided to deactivate the vibration reduction apparatus when the hammer action of the tool is deactivated.

Abstract: An electrical hand-held power tool includes a driving element (9; 9?) displaceable in the tool housing (8) along a drive axis (A) for driving a working tool (7, 7?), and at least one rigid electrical module located in the housing (8), and secured therein by at least one spring (4) that preloads the electrical module against the housing (8).

Abstract: A vibration isolation assembly is provided for use with a backfill tamper. In use, the vibration isolation assembly can be disposed between a handle and a percussion mechanism of the tamper and absorbs kickback forces from the percussion mechanism during backfill tamper operation. In one embodiment, the assembly includes an elongated conduit member that defines a passageway that allows compressed air to pass through the member to the percussion mechanism and a vibration dampening piston arrangement for absorbing feedback forces from the percussion mechanism during backfill tamper operation. The assembly may further include a spring arrangement for dampening vibration emanating from the piston.

Abstract: A vibration reduction apparatus for use with a hammer tool having a hammer piston is disclosed. The hammer piston is caused to reciprocate in the cylinder by rotation of a gear wheel and crank drive. A cam is mounted around the gear wheel, a counterweight surrounds the piston cylinder, and a cam follower is provided on the counterweight. The cam follower on the counterweight is urged into contact with the cam by a biasing element. The external profile of the cam is such that rotation of the gear wheel causes oscillation of the counterweight in antiphase to motion of the hammer piston to counteract vibrations produced by operation of the hammer action of the tool. A mechanism is provided to deactivate the vibration reduction apparatus when the hammer action of the tool is deactivated.

Abstract: An object of the invention is to provide an improved technique for lessening an impact force caused by rebound of a tool bit after its striking movement in an impact power tool. The representative impact power tool comprises a tool body, a hammer actuating member, a tool holder, a driving mechanism, a weight placed in contact with the hammer actuating member to move rearward by a reaction force transmitted from the hammer actuating member when the hammer actuating member performs a hammering operation on the workpiece and an elastic element elastically deformed when the weight moves rearward in the tool body to push the elastic element such that the elastic element absorbs the reaction force transmitted to the weight. The weight is defined one or both of the cylinder and the tool holder.

Abstract: It is an object of the invention to provide an effective technique for enhancing the effect of reducing vibration of a grip of a reciprocating power tool. According to the present invention, a representative reciprocating power tool may comprise a tool bit, a tool body and a grip. The grip is connected to the tool body via an elastic element and a vibration damping part. The elastic element is resiliently disposed between the tool body and the grip and serves to absorb vibration transmitted from the tool body to the grip during operation. The vibration damping part is disposed between the tool body and the grip and serves to damp and/or attenuate the vibration. According to the invention, the spring constant of the elastic element can be made smaller due to vibration damping part.

Abstract: An electrical power tool (1) includes a housing (10,20,30), an electrical motor (21), a motion conversion mechanism (36), a counterweight holding member (73), a counterweight (74), and support members (71,72). The electrical motor (21) is accommodated in the housing (10,20,30). The motion conversion mechanism (36) is configured to convert a rotary motion of the electrical motor (21) into a reciprocation motion. The counterweight holding member (73) extends in a direction perpendicular to directions of the reciprocation motion and is capable of being elastically deformed in the directions of the reciprocation motion. The counterweight (74) is supported by the counterweight holding member (73) and is capable of reciprocating in the directions of reciprocation motion together with the counterweight holding member (73). The support members (71,72) are positioned away from the counterweight (74) by a predetermined distance for supporting the counterweight holding member (73) to the housing (10,20,30).

Abstract: A hand-held power tool includes a vibration-compensating mass (3, 3?) secured on the tool housing and having at least one rigid compensation mass (4, 4?, 4?) oscillating along an oscillation axis (A), formed of a plurality of fixedly connected with each other mass components (12, 12?, 12?), and supported relative to the housing (2), by at least one spring (5).

Abstract: An electric hammer comprising a hammer bit (313) performing hammering work on a work, a drive motor, a hammering piece (334) driven by the drive motor to apply a hammering force to the hammer bit, and a mechanism (371) 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 (371) to vary between a first mode where the damping mechanism (371) generates vibration of the hammer bit (313) 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 (371) generates vibration corresponding to the vibration of the hammer bit (313) not subjected to an external force from the work during the no-land driving time and optimizes damping.

Abstract: The present invention relates to a control device for an impulse-generating device for inducing a shock wave in a tool, in which said impulse-generating device comprises an impact element for transmitting said shock wave to said tool, a counter pressure chamber acting against the impact element and a device for reducing a pressure in the counter-pressure chamber. The control device comprises control means for regulating the reduction of the pressure in said computer-pressure chamber. The invention also relates to an impulse-generating device.

Abstract: It is an object of the invention to provide a technique that contributes to improvement of the vibration reducing performance of a dynamic vibration reducer in a power tool while realizing reduction in size of the dynamic vibration reducer. A representative power tool which linearly drives a tool bit to perform a predetermined operation on a workpiece includes a tool body and a dynamic vibration reducer. The dynamic vibration reducer has a weight and an elastic element. The weight has an internal space that extends in the axial direction of the tool bit from at least one end of the weight in said axial direction. One end of the elastic element is inserted and received in the internal space, while the other end of the elastic element is placed on the tool body directly or via the body side member.

Abstract: A power tool has a drive motor that drives a tool and an optical guiding device secured on the power tool in alignment relative to the work tool. The guiding device is arranged in a low-vibration arrangement on the power tool and is in particular secured on the power tool in a low-vibration area of the power tool. At least one section of the power tool vibrates in the form of a standing wave in at least one direction, wherein the low-vibration area where the guiding device is arranged is the area of a node of the standing wave.

Abstract: A power hammer has a handle mounted to a housing and capable of limited movement relative thereto. A hollow axle is attached to the housing and is rotatable between a first and second position and is biased towards the first position by a torsional spring which extends within the axle. Rotation of the axle causes rotation of arms connected thereto. Connectors are slidably mounted within guides and are respectively connected at one end to each of the arms and at the other end to the handle. Vibrations in the housing cause movement of one end of the handle, which causes movement of the associated connector and arm. Movement of the one arm causes rotation of the axle, which therefore causes movement of the other arm and connector, and the other end of the handle. Thus, the movement of one end of the handle is coupled to the other end.

Abstract: A hand-held power tool, e.g. a high speed file or polisher has a single rotary drive shaft (8) to which there is locked a first eccentric member (1) in which a second eccentric member (2) can be rotated and locked forming a first assembly (10). The second eccentric member has an eccentrically placed crank pin in the form of a hollow needle bearing ring (2a) through which the drive shaft passes. The outer ring (7) of the needle bearing reciprocally drives a connecting rod (1.2) to a tool holder (9). The drive shaft also passes through an identical assembly (10f) of first and second eccentric members (1?, 2?) disposed upside down on the first assembly (10) and reciprocally driving, in the opposite direction and in counterphase, a counterweight, to cancel the reactive oscillating forces from the tool holder during operation, which would otherwise have to be absorbed by the hand and aim of the operator.

Abstract: A hammer drill includes a body, a motor; a centre of gravity, and a hammer mechanism driven by the motor in reciprocating movement along a hammer axis at a first distance from the centre of gravity. A counter mass is mounted within the body for sliding movement along a slide axis at a second further distance from the centre of gravity. A biasing member biases the counter mass to a mid-position along the slide axis. The biasing means may be a leaf spring or a helical spring. The counter mass may be slideably supported on rods and may be able to twist about a number of axes.

Abstract: A vibration reduction apparatus for use with a hammer tool having a hammer piston is disclosed. The hammer piston is caused to reciprocate in the cylinder by rotation of a gear wheel and crank drive. A cam is mounted around the gear wheel, a counterweight surrounds the piston cylinder, and a cam follower is provided on the counterweight. The cam follower on the counterweight is urged into contact with the cam by a biasing element. The external profile of the cam is such that rotation of the gear wheel causes oscillation of the counterweight in antiphase to motion of the hammer piston to counteract vibrations produced by operation of the hammer action of the tool. A mechanism is provided to deactivate the vibration reduction apparatus when the hammer action of the tool is deactivated.

Abstract: A vibration attenuated power drill is disclosed. The drill comprises a housing incorporating a motor (6) for driving an output shaft. A drill bit is driven by the output shaft by means of cooperating ratchet plates contained in a gearbox. The motor has a stator (24) and a rotor (26), and is provided with vibration attenuating means comprising leaf springs (38) attenuating vibrations transmitted from the motor to the housing along the axis of rotation of the rotor (26) relative to the stator (24).

Abstract: A shock attenuating coupling device is provided for a rotary impact tool for drivingly connecting a hammer mechanism to a drive anvil. The shock attenuating coupling device includes a first coupling member, a second coupling member, a drum, a shoe, and a body of resilient material. The first coupling member has a first drive portion. The second coupling member has a second drive portion. The drum is provided proximate the first drive portion and the second drive portion and has a radially inner engagement surface. The shoe is provided within the drum and between the first drive portion and the second drive portion. The shoe has a radially outer surface capable of being expanded in a radially outer direction. The body of resilient material is interposed between the drum and the shoe.

Abstract: Coupling for transmission of a rotational movement from a driving member to a driven member, comprising permanent magnets which are integral with the driving member and permanent magnets which are integral with the driven member, said permanent magnets having a matching polarity (N-N;S-S) and lying in respective radial planes parallel to the axis of rotation and situated opposite each other so that each pair of oppositely facing magnets produces a corresponding magnetic repulsion force. The magnet transmission force transmits the rotational movement from the driving member to the driven member.

Abstract: It is an object of the invention to provide a technique for a reduction of an impact force cased by rebound of a tool bit after its striking movement in an impact power tool. The representative impact power tool includes a tool body, a hammer actuating member, a striker, a weight and an elastic element. A reaction force is transmitted from the hammer actuating member to the weight and the elastic element is elastically deformed when the weight moves ward by the reaction to absorb the reaction force. The invention is characterized in that the mass of the weight is set to about 40% or more of the mass of the stiker.

Abstract: The present invention relates to a portable power tool with a motor housing (22a, 22b, 22c, 22d, 68) and a housing cover (26a, 26b, 26c, 26d, 72) that is attached to the motor housing (22a, 22b, 22c, 22d, 68). It is provided that the portable power tool includes insulation means (44a, 44b, 44c, 44d, 70a, 70b) adjacent to the motor housing (22a, 22b, 22c, 22d, 68) and the housing cover (26a, 26b, 26c, 26d, 72), which are guided through a guide means (50a, 50b, 50c, 50d, 52a, 52b, 52d, 92) in the direction toward the motor housing (22a, 22b, 22c, 22d, 68) and/or the housing cover (26a, 26b, 26c, 26d, 72).

Abstract: A pneumatic hammer drill includes a handle body, a pneumatic cylinder, a piston, a tool, and a damping member. The handle body has an upper part that defines a front cavity and that has a rear end. The pneumatic cylinder has a cylinder rear end fitted in the front cavity, a front tool-connecting end, and a pressure chamber. The piston is disposed slidably in the pressure chamber. The tool is inserted into the pressure chamber through the front tool-connecting end. The damping member is made of a vibration-damping material, and is attached to the rear end of the handle body.

Abstract: The invention relates to an electric tool, in particular a portable electric tool, which has at least one vibration reduction device. Provision is made for the vibration reduction device 5, 6, 7, 8, 9 to comprise at least one additional mass 15. Furthermore, the invention includes a vibration reduction device 5, 6, 7, 8, 9 which is designed for use with an electric tool.

Abstract: A hand-held power tool includes a pneumatic percussing mechanism (3) located in the power tool housing (2) and having an anvil (5) and a percussion piston (4) for applying blows to the anvil (5), and at least one oscillation damper (6, 6?) including an oscillation damping mass (7, 7?), at least one spring (8a, 8a?) for compressively preloading the damping mass (7, 7?) against the power tool housing (2), and an axially displaceable excitation member (9) for actively exciting the oscillation damper (6, 6?) in response to the anvil (5) occupying an operational position.

Abstract: A handle assembly for a power tool, the handle assembly comprising:- attachment means for attaching the assembly to a housing of a power tool; handle means adapted to be held by a user of the power tool, wherein the handle means is mounted to said attachment means and is capable of limited movement relative to the housing of the power tool; and vibration damping means acting between said housing and said handle means. The vibration damping means can comprise elastomeric material. The attachment means can be mounted in use to the housing via a bolt on one of the attachment means and the housing passing through a respective aperture in the other of said attachment means and the housing, wherein at least some of the elastomeric material is arranged in use between at least one said bolt and a corresponding said aperture. The handle means can be pivotable and/or slidable relative to said attachment means. The vibration damping means can comprise at least one spring eg. compression/spring or torsion.

Abstract: A percussion power tool apparatus includes a body relative to which an impacting tool is moved to effect an impacting operation, the apparatus further including an operating member by means of which an operating load is applied in an operating direction to the apparatus, a support structure for the operating member including a piston received in a cylinder, the operating load acting to move the piston inwardly of the cylinder whilst such movement is resisted by fluid pressure in the cylinder at one side of the piston, relative movement between the piston and the cylinder being permitted in response to vibrations arising in the body and/or impacting tool, by controlling fluid flow between the one side of the piston and a pressurised fluid support system.

Abstract: A powered hand tool comprising a pneumatic motor including a cylinder, a main body formed as a hollow tube member, a main body rear end being formed with a fluid inlet and a fluid outlet, the main body being axially disposed for engagement with the pneumatic motor, a main body front end with an interior surface fitted for engagement with a lock nut, the pneumatic motor having a rotary shaft axially extending out of the main body front end wherein the diameter of the pneumatic motor is smaller than the diameter of the hollow tube member, an internal isolation layer composed of a vibration isolation material placed in the hollow tube member so that the vibration isolation material is engaged with and adjacent the ends of the hollow tube member and the pneumatic motor.

Abstract: A vibration reduction and lubricating mechanism for a powered hammer includes a power driven piston in a cylinder that reciprocatingly drives a ram, which repetitively strikes a beat piece, which repetitively strikes a tool received in a tool holder. The vibration reduction and lubricating mechanism includes a first chamber defined in a housing of the powered hammer. A second chamber is defined within an end portion of the cylinder facing the beat piece, forward of the ram. A passageway is in communication with the first and second chambers. A counter mass is mounted for oscillating movement within the first chamber. When the hammer is operated, the counter mass is caused to oscillate to counteract vibration in the housing and to cause lubrication fluid to move between the first and second chambers.