Abstract: A reciprocating cutter system for use in spaces where a typical saw is unable to operate due to size, space, and operability limitations is disclosed. In at least one embodiment a reciprocating cutter system includes: a housing; a handle disposed on a top portion of the housing to provide an operator a user grip to operate the system; a cable saw coupled to the housing of reciprocating cutter system; a spring disposed within the housing and coupled to the cable saw such that as the cable saw is moved in a back-and-forth motion when in use, the spring also moves in a back-and forth-motion without the operator-held handle needing to move; and a connectivity bit, coupled to the cable saw, to connect the wire saw through the connectivity bit to a reciprocating device, the reciprocating device to provide the back-and-forth motion to the connectivity bit and the cable saw.

Abstract: A system, a method and a collapsible and/or folding apparatus may use a wire loop to cut an object. The apparatus may have a wire loop connected to pulleys on a carriage attached to a frame. The carriage may move relative to the frame to direct the wire loop through the object. The apparatus may have arms on the carriage that may be folded and/or a kicker frame pivotably connected to the frame that may be retracted to reduce the overall size of the apparatus.

Abstract: Bevel gear having a main body comprises a heel-side skin surface. The bevel gear has at least one tooth gap, which exits from the main body in the region of the skin surface. The tooth gap has a tooth base, the profile of which is defined by a base cone angle in relation to the workpiece axis of rotation. A concentric circumferential ring structure is provided on the skin surface, which is raised in relation to the skin surface, and which results in a heel-side exit angle between the tooth base and the ring structure, which is in the range between 125° and 160°.

Abstract: An electrical discharge machining spindle for releasably holding an electrode includes a spindle body, a movable sleeve surrounding the spindle body, first and second contact elements for clamping an electrode inserted therebetween, and a locking element that is actuated by the sleeve to selectively apply pressure to at least one of the first and second contact elements to clamp the electrode.

Abstract: In an electrical discharge machine, the top end of a vertically extending electrode is supported by an electrode holder so as to be able to be raised and lowered, the circumferential surface of the bottom end of said electrode is supported by an electrode guide that is disposed so as to be able to move vertically with respect to the electrode holder, and the position of said electrode guide is detected by a position detection unit. This electrical discharge machine is provided with a work-tank raising/lowering device. During electrical discharge machining, said work-tank raising/lowering device raises/lowers a work tank, in accordance with the electrode-guide position (Hg) detected by the position detection unit, so as to set the distance from a prescribed part of the work tank to the electrode-guide position (Hg) equal to a prescribed value (Ha).

Abstract: A replacement determination method: detects the remaining length of the electrode; detects the electrical discharge commencement position, being the position of the electrode when electrical discharge starts; detects the throughole position, being the position of the electrode when the workpiece is pierced; sets the required length for the electrode as required for machining the next throughhole, on the basis of the difference between the detected electrical discharge commencement position and the detected throughole position; compares the detected remaining length and the set required length; and determines whether or not electrode replacement is required.

Abstract: Methods and apparatus for joining a chip with a substrate. The chip is moved by with a pick-and-place machine from a first location to a second location proximate to the substrate over a first time. In response to moving the chip in a motion path from the first location to the second location, a plurality of solder bumps carried on the chip are liquefied over a second time that is less than the first time. While the solder bumps are liquefied, the chip is placed by the pick-and-place machine onto the substrate.

Abstract: The object of the invention is to provide a nozzle for a desoldering tool that facilitates the removal of solder from components having a large difference between the width and thickness dimensions of the solder connection. The present application discloses a nozzle for use with a desoldering tool for melting and sucking solder away. The nozzle includes a distal end surface which is heated to a temperature melting the solder. The distal end surface, as an upstream end of a molten solder suction path, defines a non-circular elongated generally oval shaped opening.

Abstract: A modular two-part welding and processing platform is described. A cart section is capable of rotating around objects such as pipes and cylinders, or of linear travel along plates or the like. This cart section reversibly couples to a processing section supplied for instance with welding apparatus, painting apparatus, cleaning means, analysis means or the like. By means of this two-part device, work pieces can be cleaned, welded, and inspected quickly and accurately. Special marks may be provided on the work piece which in conjunction with sensors and motoring means on the cart, allow for precise positioning of the process head with respect to the work.

Abstract: An arc-welding method in welding by repeating a short circuit and an arc. When the sign of opening of the short circuit is detected, the welding current is reduced from a first current value at the detection of the sign to a second current value, which is lower than the first current value. When the opening of the short circuit is detected, a pulse current having a peak value higher than the first current value is supplied at a plurality of times in the arc period. This suppresses porosities and spatters when galvanized steel sheets are welded.

Abstract: A tool welding system is disclosed that includes a table that heats a tool. A multi-axis robot includes a welding head that is moved relative to the table in response to a command. A controller is in communication with the robot and generates the command in response to welding parameters. The weld parameters are based upon a difference between an initial tool shape and a desired tool shape. The difference between the initial tool shape and the desired tool shape corresponds to a desired weld shape. The desired weld shape is adjusted based upon initial tool shape variations, which includes thermal growth of the tool. The tool is welded to provide the desired weld shape to achieve a desired tool shape.

Abstract: A method of identifying and selecting welding electrodes and welding output parameters on a welding power source is provided. The method includes identifying electrodes and/or electrode packaging with distinct colors and/or patterns which correspond to properties of the electrode. The method also may include employing distinguishable identifying markings on a power supply which correspond to the electrodes to be used to allow for easy setting of output parameters.

Abstract: A friction stir welding device (1) includes a workpiece disposition unit (2) at which workpieces (W) is disposed, a main body section (3) disposed at a surface (W4) of the workpieces (W) disposed at the workpiece disposition unit (2), a tool holding unit (4) formed in the main body section (3) to enable advance and retreat in a direction facing the workpieces (Z), which is a direction approaching and separating from the workpieces (W) disposed at the workpiece disposition unit (2), and configured to hold a tool (100), and a support medium (5) formed to satisfy a predetermined relative positional relationship in the direction facing the workpieces (Z) with respect to a first shoulder surface of the tool (100) attached to the tool holding unit (4) and configured to support the tool holding unit (4) on the surface (W4) of the workpieces (W) disposed at the workpieces disposition unit (2).

Abstract: An apparatus includes a splitter configured to split a laser beam into a plurality of beamlets, a phase modulator array optically coupled to the splitter and operative to produce phase differences between the beamlets, phase modulation electronics operably coupled to the phase modulator and configured to control an operation of the phase modulator array, a multicore photonic crystal fiber amplifier, the multicore photonic crystal fiber amplifier configured to amplify the beamlets output by the phase modulator array, thereby producing an amplified laser beam at an output thereof, and a waveguide optically coupled between an output of the phase modulator array and an input of the multicore photonic crystal fiber amplifier.

Abstract: A laser welder alignment system includes a laser welder, a camera associated with the laser welder configured to capture images of a loaded product within the laser welder, and a controller in communicative association with the laser welder and the camera. The controller receives visualization data from the camera and, based on the visualization data, forms and sends positioning instructions to the laser welder instructing the laser welder so as to position the loaded product at a proper weld start. The laser welder alignment system also verifies proper positioning of the loaded product within the laser welder, and verifies proper rotation of the loaded component by determining whether the rotating product has a wobble that exceeds a pre-defined wobble tolerance.

Abstract: A method and system are provided for crystallizing thin films with a laser system. The method includes obtaining a thin film comprising a substrate and a target layer that contains nano-scale particles and is deposited on the substrate. The heat conduction between the target layer and the substrate of the thin film is determined based on thermal input from the laser system to identify operating parameters for the laser system that cause crystallization of the nano-scale particles of the target layer in an environment at near room temperature with the substrate remaining at a temperature below the temperature of the target layer. The laser system is then operated with the determined operating parameters to generate a laser beam that is transmitted along an optical path to impinge the target layer. The laser beam is pulsed to create a localized rapid heating and cooling of the target layer.

Abstract: A laser welding method is capable of easily restraining poor welding when spatters adhere to a protective glass of an optical system. The laser welding method includes a step of calculating a decrease-amount of the laser power before laser welding is performed by irradiating a welding portion of a workpiece with the laser beam having a predetermined power. The step of calculating the decrease-amount includes irradiating the welding portion with an inspecting laser beam having a power smaller than the predetermined power, receiving a return beam of the inspecting laser beam, measuring an intensity of the return beam, and comparing the intensity of the return beam with a standard intensity to calculate an amount of decrease in power of the inspecting laser beam at the welding portion.

Abstract: A capacitor containing a solid electrolytic capacitor element including a sintered porous anode body and a relatively large diameter anode lead wire is provided. The lead wire is electrically connected to the anode body for connection to an anode termination. Further, the lead wire has a diameter that is at least about 10% of the height of the porous anode body to improve the points of contact between the anode body and wire to reduce ESR. A portion of the lead wire extends from a surface of the anode body in a longitudinal direction. At least one notch can be formed in the portion of the lead wire that extends from the anode body. The notch can be formed via a laser or by cutting, punching, or sawing and can serve as the point of electrical connection between the anode termination and the lead wire.

Abstract: Methods for laser additive manufacture are disclosed in which a plurality of powder layers (48, 50 and 52) are delivered onto a working surface (54A) to form a multi-powder deposit containing at least two adjacent powders layers in contact, and then applying a first laser energy (74) to a first powder layer (48) and a second laser energy (76) to a second powder layer (52) to form a section plane of a multi-material component. The multi-powder deposit may include a flux composition that provides at least one protective feature. The shapes, intensities and trajectories of the first and second laser energies may be independently controlled such that their widths are less than or equal to widths of the first and second powder layers, their intensities are tailored to the compositions of the powder layers, and their scan paths define the final shape of the multi-material component.

Abstract: The invention relates to a method for cutting a sheet metal blank having a predetermined contour from a metal strip that is continuously conveyed in a transport direction (x). The method includes the following steps of providing at least one laser cutting apparatus having at least one laser cutting head that can be moved both in the transport direction and in a y-direction extending perpendicularly thereto, and a control device for controlling a movement of the laser cutting head in accordance with a control program generating the predetermined contour; continuously measuring a path (?Xstrip) of the metal strip in relation to the transport direction by means of a path measurement device provided upstream of the laser cutting apparatus; and dynamically calculating the movements of the at least one laser cutting head by means of the control program with use of the measured path values provided by the path measuring device.

Abstract: A method for cutting passages in an airfoil using a liquid-jet guided laser beam includes positioning a frustoconical tip of the liquid-jet guided laser at a first X, Y and Z location that is defined with respect to the airfoil and at a first standoff distance of greater than 5 mm and less than 20 mm from an outer surface of the airfoil. The method also includes generating a laser beam confined within a fluid column via the liquid jet guided laser, wherein the laser beam is aimed at the outer surface. The method further includes monitoring for breakthrough of the laser beam through an inner surface of an inner cavity of the airfoil, shutting off the laser beam once breakthrough is detected and repositioning the frustoconical tip at a second X, Y and Z location and at a second standoff distance. A system for cutting a passage in an airfoil is also disclosed herein.

Abstract: A double-directional machining laser machine tool includes a focused laser source, a lifting platform, a motion platform, a rotating platform, a height sensor, a vision module, and a control device. The control device drives, according to a distance detected by the height sensor, the lifting platform to lift the focused laser source up or down, and drives, according to an image, the motion platform to displace the bearing table, so as to enable a first laser beam outputted by the focused laser source forms a first recessed hole at a predetermined position on a first surface of a workpiece. The control device drives the rotating platform to rotate the workpiece, so as to enable the first laser beam forms a second recessed hole on a second surface of the workpiece, and the first recessed hole is in communication with the second recessed hole, so as to form a deep hole.

Abstract: In a method of manufacturing a vehicle body a side structure and a center structure are positioned in place using a fixture or the like, and fixed by welding with maintained accuracy of mounting positions; annular parts along the width of the cabin of the vehicle and other parts are temporarily mounted to be retained without being welded; additional welding is performed on the center structure and the side structure, and the annular parts along the width of the cabin of the vehicle and other parts are positioned in place using a fixture or the like, and are fixed by welding with maintained accuracy of mounting positions; additional welding is performed on the parts; and a roof complex is mounted and fixed by welding with maintained accuracy of mounting positions.

Abstract: Method for replacing, inspecting, and/or repairing components in front bearing region of gas turbine, the gas turbine having at least one fan module, housing, low-pressure system, and high-pressure system, the low-pressure system having low-pressure compressor, low-pressure turbine, connecting shaft, stub shaft, and an N1 shaft connected to the low-pressure compressor via the stub shaft and the connecting shaft, the connecting shaft supported in the housing via first bearing unit, and the stub shaft supported in the housing via second bearing unit, the method including dismounting the fan module, fixing the N1 shaft in an axial direction relative to the housing using fixing device, and dismounting the stub shaft using guide device, the orientation of which relative to the gas turbine in at least one spatial direction is determined by a component of the remaining gas turbine, this taking place after fixing the N1 shaft and after dismounting the fan module.

Abstract: A method for manufacturing an assembled camshaft for valve-controlled internal combustion engines, in which at least one cam disc with a base circle region and cam region is machined on the running surface and has a cam-disc recess, includes shrinking the cam disc onto a corresponding shaft designed with a defined dimensional overlap by cooling the shaft and heating the cam disc. Temporally before being shrunk onto the shaft, the at least one cam disc is clamped by a clamping device such that a tension force acts on the recess wall region, which defines the cam-disc recess, the tension force corresponding to a predetermined extent to the state of stresses and/or deformation state of the recess wall region after the operation of shrinking the cam disc onto the corresponding shaft. The running-surface machining of the at least one cam disc takes place when the cam disc is clamped by the clamping device.

Abstract: A fluorocarbon resin composite includes a fluorocarbon resin layer on a base, in which a fluorocarbon resin constituting the fluorocarbon resin layer is crosslinked by electron beam irradiation, and the base has a desired shape obtained by machining. The fluorocarbon resin is composed of a tetrafluoroethylene-perfluoro(alkyl vinyl ether) copolymer, polytetrafluoroethylene, or a mixture of the tetrafluoroethylene-perfluoro(alkyl vinyl ether) copolymer and polytetrafluoroethylene. A fluorocarbon resin composite, cookware, and a roller and a belt for use in office automation equipment are each produced by applying an uncrosslinked fluorocarbon resin on a base, subjecting the fluorocarbon resin to electron beam irradiation in a low-oxygen atmosphere to crosslink the fluorocarbon resin while the temperature of the fluorocarbon resin is maintained at a temperature equal to or higher than the melting point of the fluorocarbon resin, and machining the base into a desired shape.

Abstract: An axial cast hole is formed to have a large diameter side end on one side at a draft angle. A large diameter hole is formed on the one side to form a stepped surface between the large diameter hole and the axial cast hole. The stepped surface has an inner periphery end located on a plane perpendicular to the axial direction. A tool is moved from the one side toward the other side coaxially with the axial cast hole to make contact with the stepped surface. The tool is moved subsequently to cut the inner periphery of the axial cast hole between the large diameter hole and the first port. The tool is moved subsequently to cut the inner periphery of the axial cast hole on the other side relative to the first port.

Abstract: A method for assembling a helically geared first sprocket, particularly a worm gear and a second sprocket arranged on an axis, particularly a worm, to form a transmission, particularly a worm drive, in which the first sprocket is positioned coaxially in reference to an axis of assembly of the first sprocket, aligned at a 90° position in reference to the axis via an assembly device.

Abstract: An eyeglass lens processing apparatus for processing a periphery of an eyeglass lens includes: a lens chuck shaft configured to chuck the eyeglass lens; a shaft angle changing portion configured to change a shaft angle of the lens chuck shaft; a first processing tool unit including at least one spindle at which a first processing tool is provided; a second processing tool unit that is disposed to oppose the first processing tool unit and that includes at least one spindle at which a second processing tool is provided; and a controller configured to change one of the first and second processing tool unit to be used for processing the eyeglass lens to the other of the first and second processing tool by controlling driving of the shaft angle changing portion to change the shaft angle of the lens chuck shaft.

Abstract: The disclosure relates to an apparatus for keeping a friction roller. The apparatus for keeping a friction roller comprises a cylinder provided with a plurality of brackets for storing the friction roller, a friction roller pick-and-place execution unit for picking and placing the friction roller, a cylinder driving unit for driving the cylinder to rotate, a storage sensor unit for sensing whether a friction roller exists on a bracket, a pick-and-place position sensor unit for sensing whether a bracket arrives at a pick-and-place position of the friction roller, and a control unit. The apparatus for keeping a friction roller according to the disclosure may access more friction rollers accurately; and the stroke of the action of picking and placing a friction roller is relatively short, such that the work efficiency of picking and placing a friction roller is also increased very greatly.

Abstract: A hand power tool includes a tool receiver configured to receive a tool. The tool has an outer polygonal coupling and the tool receiver has an inner receiver including, at least portionally, a rotary driver profile. The tool receiver is provided on an associated tool housing, in which there is a drum-type tool change magazine having at least one tool chamber configured to store the tool. The tool chamber is configured to be aligned so as to be flush with the tool receiver to enable the tool to slide from the tool chamber into the inner receiver or from the inner receiver into the tool chamber. An alignment element is configured to align the outer polygonal coupling as the tool slides from the tool chamber into the inner receiver to enable the outer polygonal coupling to slide into the rotary driver profile.

Abstract: A power tool assembly includes a hand-held power tool, a dust collector removably coupled to the power tool, and first and second power tool battery packs each of which is interchangeably coupled with the power tool and the dust collector for separately powering the power tool and the dust collector, respectively.

Abstract: A mower reel grinding apparatus including at least one bracket moveable in a horizontal plane along a positioning axis to any one of a number of predetermined positions and configured to releasably secure to a pivot mechanism of a plurality of types of mower units, the pivot mechanism having a pivot axis, each type of mower unit including a cutting reel positioned at a known location relative to the pivot axis, and each of the predetermined positions corresponding to at least one type of mower unit of the plurality of types of mower units, wherein the at least one bracket is moved to the predetermined position corresponding to the type of mower unit secured thereto such that the cutting reel is positioned at a desired grinding position along the positioning axis when the pivot axis is secured to the bracket.

Abstract: Embodiments of the present disclosure relate generally to an apparatus and method for treating a rotatable component. An apparatus according to the present disclosure can include: a sliding engagement member configured to slidably engage a portion of a rotating component that is temporarily stationary; and a tool engaging member for positioning a machining tool relative to the rotating component to machine a surface of the rotating component, wherein the tool engaging member is rotatable to one of a plurality of angles relative to the sliding engagement member.

Abstract: A carrier may be configured and operated to engage a lapping plate with a plurality of physically separated sliders attached to a common adhesive of the carrier. The carrier can be constructed to have at least one finger adjacent to and capable of translating a single slider of the plurality of physically separated sliders.

Abstract: A chemical mechanical polishing pad is provided, comprising: a chemical mechanical polishing layer having a polishing surface; wherein the chemical mechanical polishing layer is formed by combining (a) a poly side (P) liquid component, comprising: an amine-carbon dioxide adduct; and, at least one of a polyol, a polyamine and a alcohol amine; and (b) an iso side (I) liquid component, comprising: polyfunctional isocyanate; wherein the chemical mechanical polishing layer has a porosity of ?10 vol %; wherein the chemical mechanical polishing layer has a Shore D hardness of <40; and, wherein the polishing surface is adapted for polishing a substrate. Methods of making and using the same are also provided.

Abstract: A plurality of rotatable small table are disposed on a rotatable large table, and a workpiece is mounted on the small tables. Above a projection range in the large table, a pressing part is provided. The pressing part is elevated and lowered by an elevating/lowering mechanism between a withdrawn position spaced above the workpiece on the small table and a pressing position for pressing the workpiece on the small table from above. Also, the pressing part is rotationally driven coaxially with a rotary shaft of the small table and in the same rotating direction and at the same rotating speed as the small table, by a third drive mechanism.

Abstract: A coated abrasive article having a plurality of formed ceramic abrasive particles each having a surface feature. The plurality of formed ceramic abrasive particles attached to a flexible backing by a make coat comprising a resinous adhesive forming an abrasive layer. The surface feature having a specified z-direction rotational orientation, and the specified z-direction rotational orientation occurs more frequently in the abrasive layer than would occur by a random z-direction rotational orientation of the surface feature.

Abstract: An abrasive article has an abrasive portion and chopped strand fibers (CSF) with enhanced strength and/or fracture of toughness. The CSF may be coated with a thermoplastic having a loss on ignition of at least about 2 wt %. The CSF can have a primary coating and a secondary coating on the primary coating. At least some of the CSF can have a length of at least about 6.3 mm.

Abstract: The invention concerns a tool for machining of materials, specifically a grinding tool, which has a substantially rotationally symmetrical shape with respect to a rotation axis (R), the tool comprising an outer shell centered about the rotation axis and defining an internal space therein, wherein at least a part of a surface of the outer shell is provided with an abrasive coating or component, wherein the outer shell encases an internal skeleton structure in the internal space, the internal skeleton being integral with the outer shell and defining void volumes in the internal space thereby establishing material and void volumes of the internal space, and wherein the material to void ratio M/V is distributed substantially identically along each radius (r) centered around the rotation axis (R) and its corresponding symmetrical radius (r?). The invention also concerns a method for producing such tool.

Abstract: A low pressure, low speed concrete polishing apparatus and method of cleaning and polishing a floor a polishing pad and interchangeable polymer strips. The interchangeable polymer strips are slideably received within the housing of the pad. The polymer strips have an abrasive material embedded therein which collectively work to polish the floor while cleaning the floor during normal speed floor cleaning conditions.

Abstract: The present invention relates to an electrodeposited diamond wire saw using patterned non-conductive materials in which non-conductive materials are pre-patterned along the outer circumference of a wire on which diamond grit should not be rubbed, before the diamond grit is upset, in order to efficiently improve the manufacturing process, and to a method for manufacturing same. According to one preferred embodiment of the invention, the method for manufacturing an electrodeposited diamond wire saw includes: printing a masking solution on the outer circumference of a wire in a plurality of directions when the wire is inserted for patterning; and upsetting diamond grit on the remaining regions of the outer circumference of the wire, with the exception of the patterned region.

Abstract: A clamping tool includes a strut having one end and defining a longitudinal axis. Arranged on the one end of the strut is a mount which includes a bushing that is arranged on the strut. The bushing includes recesses and a receptacle which interacts with the recesses so as to be rotatably mounted in the bushing. The bushing has an interior provided with at least one groove for receiving an O-ring which is sized to extend beyond the groove to inhibit a rotational mobility of the receptacle. A clamping device is received in the receptacle of the mount and configured to swing about an axis perpendicular to the longitudinal axis of the strut.

Abstract: An adjustable wrench includes a frame and a movable jaw. The frame includes a handle, a fixed jaw, a guiding slot formed between the handle and the fixed jaw, a hole communicated with the guiding slot, and a holding portion. An adjusting screw is rotatably engaged in the hole. The movable jaw includes a guiding portion slidably engaged in the guiding slot, a supporting portion formed at a bottom side of the guiding portion, and an adjusting portion formed at a top side of the guiding portion. The supporting portion is abutted against the holding portion. The adjusting portion is engaged with the adjusting screw.

Abstract: A portable and battery-operated tool for machining a workpiece and to a method for replacing the rechargeable battery of the tool is disclosed. The tool has at least one drive device for driving a working head, at least one rechargeable battery for providing electrical energy, at least one control device with an operating system for controlling and/or regulating machining parameters, at least one storage device for storing machining data and at least one transmitting and receiving device for transmitting and/or receiving the machining data and also at least one substantially electrical element for storing electrical energy at least for a short time in order to make it possible to replace the rechargeable battery when the operating system is activated.

Abstract: A driving tool is provided, including a tool set and a driving head. The tool set includes a connecting sleeve, an outer sleeve and at least one limitation member. The connecting sleeve has a receiving slot and a driving end. A plurality of protruding ribs extending axially and a plurality of recesses disposed between the protruding ribs are disposed on an inner wall of the receiving slot. The recesses are provided for a polygonal ball head to insert therein. A recessed portion and a protruding portion are disposed on the inner wall. The outer sleeve is slidable between a first position and a second position. When the outer sleeve is at the first position, the limitation member can restrict the polygonal ball head. When the outer sleeve is at the second position, the polygonal ball head is withdrawable from the receiving slot.

Abstract: A fastener extraction ratchet bit system for facilitating extraction of stripped fasteners by permitting attachment of extraction bits to an air drive ratchet. The system includes a driving tool and a fitting coupled to and extending from the driving tool. A drill socket is coupled to a drill bit wherein the drill bit is selectively couplable to the fitting such that the driving tool provides a driving force to the drill bit. An extraction socket is coupled to an extraction bit wherein the extraction bit is also selectively couplable to the fitting such that the driving tool provides the driving force to the extraction bit.

Abstract: The invention concerns a driving tool comprising a motor, in particular, an electric motor, a gas spring with an elastically compressible gas volume, and a firing piston, wherein the gas spring can be tensioned via a tensioning device with the motor, so as to accelerate after a release from a tensioned state the firing piston in a firing direction, wherein at least one part of the tensioning device is located within the gas volume of the gas spring.

Abstract: A hammer tacker includes a shell and a striking mechanism. The shell is composed of two half-shells which are made of a mixture of 30% to 70% of fiberglass and 70% to 30% of nylon by weight by injection molding. The two half-shells enclose an opening at an end of the shell. Each half-shell has a positioning rib portion facing to the other half-shell. The striking mechanism is arranged in the shell and includes a magazine, a striker, an actuator, and a transmission mechanism. The magazine is positioned by the positioning rib portions. The striker is located at the opening and is movable for striking nails out. The actuator is also movable at the opening. The transmission mechanism connects the striker and the actuator together to make them move oppositely.

Abstract: Disclosed is a fluid hammer tool with two separate fluid hammers in separate sections of the tool. The tool includes an upper poppet valve assembly along one fluid flow path, and a lower poppet valve assembly along a separate outer flow path. Both fluid flow paths are fed from an upper sub and both exit through a lower sub. Both poppet valves include spring return mechanisms. Sealing of each poppet valve propagates an upstream shock wave. The lower poppet valve assembly encounters greater fluid flow and generates a larger shock wave. In the period when the upper poppet valve is closed, the lower poppet valve cannot open.