Abstract: A firing control device for use in a pneumatic tool includes a flow path unit, a conditioning valve and a switch valve. The flow path unit is connected to a main. chamber and an operating chamber of the pneumatic tool. The conditioning valve blocks fluid communication between the main chamber and the operating chamber via the flow path unit. When the switch valve is activated, the pressure in the casing is permitted to move the conditioning valve. The conditioning valve is moved to permit the fluid communication between the main chamber and the operating chamber via the flow path unit when the switch valve is continuously activated by a predetermined time period.

Abstract: An adaptor is mounted on the tip of a nail gun normally used to attach roofing materials on the roof of a building to enable the nail gun also to be effective in attaching vinyl siding onto the exterior of a building structure. The adapter is mounted on the tip of the nail gun to engage nails discharged therefrom. The adaptor is formed with a circular projection that has a frusto-conical opening therethrough to guide discharged nails into engagement with the connective structure along the top edge of the siding panel. The circular projection has a depth that properly positions the discharge opening of the adaptor at the proper location for engagement with the siding connective structure. The conical shape of the opening through the adaptor is operable to deflect any misaligned nails being discharged from the nail gun into the discharge opening at the tip of the circular projection.

Abstract: A driving tool, such as a nailer, includes a compression cylinder, a compression piston, an electric motor, a control apparatus, a trigger, a trigger switch, a driver guide, and a contact-arm switch. The control apparatus prevents fasteners, such as nails, from being driven when the controller identifies a state, in which it is likely that a malfunction or mis-operation of the driving tool is occurring.

Abstract: A vertical foregrip for a firearm is structured to secure a nonlethal weapon or compliance device, for example, a commonly available pepper spray canister, therewithin. Some examples of the vertical foregrip may include an attachment that is structured to secure to a commonly available accessory rail such as a Picatinny rail. The vertical foregrip facilitates use of the nonlethal weapon or compliance device while the firearm is being held by the shooter, with the support hand holding the vertical foregrip and activating the compliance device.

Abstract: A firing apparatus for a floor nailing gun includes a hollow shell, a driving device and a front end cover. The driving device and the front end cover are respectively disposed at rear and front end portions of the hollow shell. A piston barrel and a tapping seat are disposed inside the shell. The piston barrel has a first end portion and a second end portion that is smaller than the first end portion, where the second end portion of the piston barrel extends from a front end portion of the shell to the inside of the shell and is connected to the driving device, and the first end portion is connected to the tapping seat. The front end cover is provided with a through hole, such that a front end of the tapping seat passes through the through hole to protrude from the front end cover.

Abstract: A driving tool, such as a nailer, includes a compression piston slidably disposed within a compression cylinder. An electric motor and a crank mechanism reciprocally drive the compression piston within the compression cylinder, and a sensor directly or indirectly detects the position of the compression piston. Prior to the start of a driving operation, a return operation is performed to move the compression piston to its bottom dead center when the sensor detects that the compression piston is located at a position other its bottom dead center.

Abstract: A fastener driving tool comprises a hand-held casing having a movable and drivable energy transmission element including a driving member, wherein the driving member acts to drive a fastener, a locking element, and a sensor member for determining an operational state of the fastener driving tool, wherein a driving process is released only if the operational state prevails, wherein the locking member is arranged in a locking manner in a path of the energy transmission element if the non-operational state prevails, wherein, once a driving process has been triggered, the locking member can stop the energy transmission element.

Abstract: A powered nailer includes a power source including a driving element reciprocating within a cylinder between a prefiring position and a fastener driving position, the latter occurring when the driving element engages a bumper disposed at the bottom of the cylinder. A reciprocating valve element defines a combustion chamber in fluid communication with the cylinder, and is configured for receiving a dose of fuel and air prior to a user-generated ignition. A return chamber at least partially surrounds the cylinder and is in fluid communication with the cylinder, being configured for receiving a supply of pressurized air generated by the driving element as it moves from the prefiring position to the fastener driving position, the pressurized air acting on an underside of the driving element for returning it to the pre-firing position.

Abstract: A pneumatic nail gun operated in automatic actuation mode includes a gun body, a trigger valve, and a shuttle valve. The gun body defines therein a main chamber and is provided with a forward air conduit and a return air conduit. The forward air conduit provides a path for the pressurized air in the main chamber to force a valve stem of the shuttle valve to conduct a forward movement for a drive stroke. The return air conduit provides a path for the pressurized air in the cylinder to force the valve stem to conduct a return movement after the nail gun has completed the drive stroke. By depressing an actuating bar of the trigger valve a single time, the valve stem can be forced to conduct repeated forward and return movements, and thus the nail gun can conduct repeated drive strokes for stably striking a nail.

Abstract: A driving tool having first and second linear motors, a head assembly, a nosepiece and a driver. The first linear motor forms an air compressor and includes a scotch yoke mechanism for translating a first piston in a first cylinder. The scotch yoke mechanism includes a crank arm, a crank arm roller, which is coupled to the crank arm, and a connecting rod having a roller slot into which the crank arm roller is received. At least a portion of the roller slot is configured to vary an output rate at which the connecting rod translates along a translation axis relative to an input rate at which the crank arm roller moves in a direction that is parallel to the translation axis.

Abstract: An interchangeable shaft assembly for use with a surgical instrument. The surgical instrument may include a frame that operably supports a plurality of drive systems and defines an actuation axis. The shaft assembly may comprise a first shaft that is configured to apply first actuation motions to a surgical end effector that is operably coupled thereto. A proximal end of the first shaft is configured to be operably releasably coupled to a first one of the drive systems supported by the frame in a direction that is substantially transverse to the actuation axis.

Abstract: A device includes an actuation system with a dose chamber including an inlet for high pressure fluid. A working chamber extends away from the dose chamber. An annular wall separates a portion of the working chamber from the dose chamber such that the dose chamber encompasses the portion of the working chamber. In use an item to be driven along the working chamber is at least partially within the surrounded portion of the working chamber with the item at one end of its travel in the working chamber. A valve mechanism selectively allows high pressure fluid from the dose chamber to flow into the piston chamber.

Abstract: The invention relates to a fastening tool comprising a handheld housing with a piston element (1), which is received in the housing and which can be moved in a driven manner, for transmitting energy to a fixing element (3). The piston element (1) is guided in a cylinder (2) and can be accelerated towards the fixing element (3) by a drive force, and the piston element (1) can be held in a starting position by a magnetic force of a retaining element (5). The retaining element (5) has a first magnetically conductive stop (7) and a second magnetically conductive stop (8). The magnetic stops (7, 8) are connected by a magnetically conductive counter piece (9) arranged on a piston element when the piston element (1) is being held, and excitation magnet (6) is arranged between the magnetically conductive stops (7, 8).

Abstract: A safety device for a nailer has a movable element movable between a locking condition and a release firing condition. At least one lock has a stopping end movable to engage an abutment fixed to or carried by the movable element, for stopping it in the locking condition. When disengaged, the stopping end allows translation to the release position. The lock is also provided with an elastic element which acts in the direction of the stopping condition, with an arming mechanism acting counter to the elastic element, for shifting the lock and the respective stopping end for moving to the armed condition. An operator, to put the nailer in the armed and released conditions, must act on the arming mechanism to free the abutment from the stopping end, and he must place the movable element in the release condition to shoot the nail by pulling a trigger.

Abstract: A fastener driving tool includes a nose portion, a supply passage and a fastener supply mechanism. The nose portion includes an injection passage for injecting a fastener. The supply passage is connected to the injection passage. The fastener supply mechanism feeds connected fasteners to the injection passage. The fastener supply mechanism includes a feed member which advances and retreats in a feed direction and which oscillates in a direction to retreat from the supply passage. The feed member includes a feed tooth which feeds the fastener to the injecting passage by engaging with a rear portion of the fastener and an auxiliary tooth which is disposed on a foot side of the fastener to prevent the fastener from deviating from the injection passage. When the feed tooth of the feed member projects into the supply passage, the auxiliary tooth projects into the supply passage longer than the feed tooth.

Abstract: A fastener driver tool powered by a pressurized power source having a supply of compressed fluid includes a magazine associated with the tool for storing and supplying fasteners to a tool nose. A cylinder in the tool has a reciprocating piston associated with a driver blade sequentially engaging fasteners from the magazine as they are fed into tool nose. A control system is configured for directly electrically controlling a flow of compressed fluid for driving the piston.

Abstract: Disclosed is a binding machine for agriculture which is used when binding, using a binding tape, a crop to a pole which is previously installed near the crop so as to keep in places the stems or branches of various crops. A steel needle standby groove is formed at an inner side of the steel 5 needle exit of the steel needle supply part loaded with binding steel needles, and when steel needles are extruded, the steel needle is separated from the steel needle group and stands by in the steel needle standby groove, and in the steel needle extrusion plate, a steel needle separation protrusion is formed at a side surface 10 in the direction of the steel needle standby groove, and then the binding steel needle is extruded.

Abstract: The invention provides, in one aspect, a pneumatic fastener driver including a cylinder and a piston positioned within the cylinder. The piston is moveable between a top-dead-center position and a bottom-dead-center position. The driver also includes a magnetic latch emitting a magnetic field that magnetically attracts the piston and is capable of holding the piston in the top-dead-center position with a magnetic force. The magnetic latch is adjustable to vary the magnetic force acting on the piston for driving fasteners into a workpiece at different depths.

Abstract: A captivated seal assembly is disclosed. The seal assembly may include a metal seat shield, an annular elastomeric seal and a metal bonding ring. The metal bonding ring is preferably bonded to and fully encapsulated within the annular elastomeric seal. The composite metal bonding ring and elastomeric seal is contained in an annular recess formed in the metal seat shield. The metal bonding ring is secured to the metal seat shield, thereby retaining the elastomeric seal within the annular recess of the metal seat shield. The metal bonding ring may include a plurality of support pads for engagement with an annular back wall of the metal seat shield.

Abstract: A fastener-driving tool is provided and includes a housing and a workpiece-contacting element movably connected to the housing, where the workpiece-contacting element is movable between a rest position and an activated position. A trigger is movably connected to the housing such that the trigger is movable between a rest position and an activated position. The tool further includes an actuation lever movably connected to the trigger and movable between a rest position and an activated position. A damper mechanism is associated with the actuation lever and is configured to control a rate of movement of the actuation lever between the activated position and the rest position.

Abstract: An animal trap may include a source of compressed gas; a trigger mechanism configured to be actuated by an animal, and a kill mechanism powered by compressed gas. The trap may include two or more trigger valves connected in series. At least one trigger valve may include an opening, a valve seat surrounding the opening, a valve member having a sealing surface, and an O-ring arranged to seal between the sealing surface and the valve seat. One or more flow paths may allow gas to flow along at least part of an internal periphery of the O-ring. The trigger may include a trigger rod extending in a rest position from a mount at or near a first end thereof. The trigger rod may be mounted for pivoting movement about the mount, and may have two rotational degrees of freedom. Pivoting movement of the trigger rod in any direction away from the rest position may result in actuation of the trigger.

Abstract: An alignment device aligns rollers R in an annular shaped alignment space 24 in parallel to each other while at the same time prevents damage from occurring on rolling surfaces of rollers R. Plural rollers R that are arranged in a row in an axial direction are sequentially supplied into an annular shaped alignment space 24 that is formed in a main jig 14 in a direction that coincides with a width direction of the alignment space 24. The plural rollers R are aligned in an annular shape so as to be in parallel to each other by alignment-fluid-supply means 16 spraying air onto a roller R that is in a supply position in the alignment space 24 from a direction that is orthogonal to the roller R supply direction and moving the roller R in a circumferential direction of the alignment space 24, and then supplying a next roller R into the alignment space 24.

Abstract: A device for applying fasteners having one almost flat head having a central pass through hole, two opposed sides having protrusions approximately perpendicular to the head forming shoulders, has a first nail magazine for locking a fastener. A shooting device shoots a nail through the fastener central hole. A second magazine has a slide guide housing a set of fasteners, with tongues oriented in a forward sliding direction, the shoulders oriented towards an outlet. The outlet has jaws hinged to rotation pins, perpendicular to the sliding direction. Front portions of the jaws fully protrude from the second magazine, each jaw having teeth having a shoulder shape to match a shoulder shape of a fastener interposed between the jaws. The teeth elastically and detachably hold the fasteners in an aligned position with the pass through hole and with the shooting direction of the shooting device.

Abstract: A hand-held power tool is disclosed. The tool has a pneumatic striking mechanism. The striking mechanism includes a motor-driven exciter, a guide tube and a striker. A pneumatic spring configured inside the guide tube between the exciter and the striker is circumferentially sealed pressure-tight by an inner surface of the guide tube. The exciter and/or the striker are configured as a piston guided by the inner surface. An inner surface of the guide tube is provided with a plurality of molded depressions.

Abstract: A nosepiece assembly for a fastening tool that has a contact surface made of a contact material. The contact surface can provide the nosepiece assembly wear resistance against the action of nails and/or a driver blade of a nailer. The nosepiece assembly can optionally have one or more of a nosepiece insert, a nail stop and a blade guide, each of which can be made at least in part of the contact material. The contact material can be investment cast.

Abstract: An animal trap is powered by compressed gas and includes a trigger mechanism and kill mechanism. The trap is preferably self-resetting. A variety of sources of compressed gas may be used, and different kill mechanisms may also be used. The trap is particularly suited to applications where low-maintenance traps are required, because it uses a simple, reliable mechanism which can kill a number of animals over a long period of time without requiring maintenance or manual resetting.

Abstract: A pressurized fluid container for use with a fastener-driving tool, the container having an outer shell defining an inner chamber, having an open neck and an effective height, a closure sealingly engaged on the open neck, and a tube depending from the closure.

Abstract: A fastener driving tool including a housing, a cylinder enclosed by the housing, at least one sensor associated with the cylinder and a piston configured to reciprocate within the cylinder and having a driver blade depending therefrom. The tool includes at least one signal generator associated with the piston, where movement of the piston relative to the at least one sensor generates a signal. A controller is configured to receive the signal and indicate a fastening result based on the signal.

Abstract: A fastening tool having plural power source ports that, when contemporaneously activated, deliver compressed air to a fastener driving assembly to drive a fastener into a workpiece.

Abstract: An applicator tool is disclosed for applying a fastener between cooperating surfaces of a dielectric protector placed at least partially over a component of an electrical power transmission system, the applicator tool made at least in part of dielectric material and comprising: a structural frame element; a fastener mount connected to the structural frame element and moveable relative to the structural frame element between a first position and a second position to at least partially define a fastener drive path; and an actuator connected to drive the fastener mount from the first position to the second position to apply in use a fastener, mounted on the fastener mount, through cooperating surfaces positioned on the fastener drive path. A tool is also disclosed for holding together in alignment two mating surfaces with pre-drilled holes and applying a fastener to penetrate the holes and secure the mating surfaces together.

Abstract: The utility invention discloses a quick-release type three-in-one pneumatic nailer, comprising a body, a handle, a magazine, a loading nails hole arranged on the right side of the magazine and a nailer head in front of the body, is characterized in that: a magazine guide bar fixing in the rear of the magazine, a magazine fixing plate is arranged in the higher part of the front side of the magazine; a snap pin is arranged in the nailer head matched with the magazine fixing plate; an angle adjusting block is fixed in the lower part of the handle; the angle adjusting block in provided with a plurality of slots matched with the magazine guide bar.

Abstract: A driving tool includes a first piston slidably disposed within a cylinder chamber and having an elongated driving part configured to drive a struck material. A second piston is configured to generate compressed air within the combustion chamber. A compressed air supply passage enables communication between the compression chamber and the cylinder chamber. A valve member opens and closes the compressed air supply passage. A relay member mechanically connects an electric motor with the valve member. The valve member opens and closes the compressed air supply passage via the relay member.

Abstract: A driving tool having first and second linear motors, a head assembly, a nosepiece and a driver. The first linear motor forms an air compressor and includes a scotch yoke mechanism for translating a first piston in a first cylinder. The scotch yoke mechanism includes a crank arm, a crank arm roller, which is coupled to the crank arm, and a connecting rod having a roller slot into which the crank arm roller is received. At least a portion of the roller slot is configured to vary an output rate at which the connecting rod translates along a translation axis relative to an input rate at which the crank arm roller moves in a direction that is parallel to the translation axis.

Abstract: A compressible fluid powered device includes a dose chamber. An inlet supplies pressurized fluid to the dose chamber. An outlet for releases pressurized fluid from the dose chamber. A moveable divider divides the dose chamber into a primary space and a secondary space, movement of the divider expanding one space at the expense of the other. At least one flow pathway from one space to the other, which collectively allow gas to flow in both directions past the divider and pressure to equalize across the divider, the flow pathway being much more limited than the outlet.

Abstract: A hook assembly includes an end cap having an outer periphery. The end cap is configured to be connected to a power tool. A hook is rotatably coupled to the outer periphery of the end cap. An O-ring is positioned between the outer periphery of the end cap and the hook. A protrusion is included on one of the outer periphery of the end cap and the hook to frictionally engage the O-ring to secure the hook in at least one selected rotational position relative to the end cap.

Abstract: A fuel container holding structure for detachably holding a fuel container 40 including a nozzle 44 in its front end portion is provided with a front end holding portion 22 for holding the front end portion of the fuel container 40 and a rear end holding portion 28 for holding a rear end portion of the fuel container 40. The front end holding portion 22 includes a connecting portion 23 to which the nozzle 44 is connected and a buffer mechanism 25, 42 disposed between the connecting portion 23 and fuel container 40. The fuel container 40 is supported by the buffer mechanism 25, 42.

Abstract: A fastener driving tool is capable of not only linearly driving but also rotationally fastening a fastener into a workpiece P. The fastener driving tool includes a housing 2, a nose portion 40 formed with an injection passage 40a through which a fastener 41 is driven, a magazine 4 accommodating fasteners 41 and supplying a fastener 41 to the nose portion 40, a push lever 5 movable relative to the housing 2 upon depression against the workpiece P, combustion chamber frames 12, 22 movable in the housing 2 in accordance with the movement of the push lever 5, and first and second cylinders 7, 8 fixed to the housing 2. First and second pistons 71, 81 are movably disposed in the first and second cylinders 7,8, respectively, and a bit 9 extends from the first piston 71. A rod 14 formed with a rack 14A extends from the second piston 72. The rack 14A is engageable with a motion conversion mechanism 6 for converting a linear motion of the rod 14 into rotational motion of the bit 9.

Abstract: A fastener driving apparatus includes a vacuum piston and a drive piston, which vacuum piston, when moved (by way of a motor and linear motion converter), draws a vacuum against the drive piston, which drive piston may be held in place by retention means. An anvil is coupled to the drive piston. The retention means is released electrically or mechanically at or near the point of maximum vacuum volume. This drive piston and anvil assembly is then driven by atmospheric pressure and may strike a fastener to drive it into a substrate. At least one position sensor may be used. Once the fastener is driven, the apparatus may reset to an initial position. At least one parasitic loss seal may be provided to reduce drag force on the drive piston, and a timed dwell may be provided for the vacuum piston for operation.

Abstract: The present invention includes methods and apparatus for discharging a fastener. In particular embodiments, the invention comprises a fastener-dispensing device comprising a fastener striker in operational communication with a striker driving means. The fastener-dispending device also includes a device body comprising an upper portion and a lower portion, the upper portion containing the striker driving means and the lower portion containing the striker, wherein the upper portion is pivotable in a sideways direction relative to the lower portion.

Abstract: A pneumatic tool includes: a body; a pneumatic driving unit disposed in the body for performing pneumatically a fastener-driving operation; a trigger valve unit disposed on the body and adapted for controlling flow of air into the pneumatic driving unit and out of the body; and a passage unit formed in the body and including an air storing chamber adapted for guiding flow of air into the trigger valve unit, a bidirectional passage for intercommunicating the trigger valve unit and the pneumatic driving unit, an exhaust passage communicated with the trigger valve unit, and an expansion passage adapted for intercommunicating the exhaust passage and the atmosphere and extending along a peripheral portion of the body as to permit flow of air from the exhaust passage into the atmosphere therethrough.

Abstract: In a gas combustion type striking machine, a combustion chamber is opened and closed by moving a movable sleeve in a vertical direction. A safety lever is attached to a trigger, and a switch is switched by being pressed by a switch lever arranged to be engageable with the safety lever. A hold member which is engageable with the movable sleeve is rotatably connected to the trigger. A shaft supporting a base end of the hold member positions between a shaft supporting the switch lever and a cylinder in a right-left direction which is perpendicular to the vertical direction.

Abstract: In an electric power tool in which a metal front housing that accommodates a driving mechanism is assembled to the front of a main housing that accommodates a motor, an output shaft is protruded from the distal end of the front housing, and the outer periphery of the front housing is protected by a cylindrical transparent cover made of synthetic resin, a decorative pattern is formed on the inner surface of the transparent cover. The decorative pattern is formed of bumps and dips formed on the inner surface.

Abstract: An adjustable exhaust assembly for a pneumatic fastening tool having body and a handle extending from the body, the handle defining an inlet channel for receiving input of pressurized gas and an outlet channel for outputting exhaust. The adjustable exhaust assembly includes a base non-rotatably attachable to an end of the handle opposite the body. The base has a plate and a boss extending from the plate. The boss is configured to receive an air hose and defining an inlet opening configured to direct compressed air to the inlet channel. The plate has an outlet opening in communication with the outlet channel. A substantially annular and cap is rotatably received about the boss. The cap defines a substantially annular channel in communication with the outlet opening of the base and an outlet port defined in a portion of a circumferential wall of the annular cap and in communication with the annular channel.

Abstract: The present invention is directed to a pneumatic tool actuation device comprising a housing configured to be attached to a pneumatic tool, a piston slidably moveable within a drive chamber formed within the housing and an air inlet chamber formed within housing and configured to accept a pressurized gas and direct it to the drive chamber. The piston further comprises an O-ring disposed in an annular groove formed in the piston and forming a seal between the piston and the drive chamber. The housing is removably attached to an opening near a trigger valve pin. The air inlet chamber is operably connected to a hose through which a pressurized gas travels and enters the housing to move the piston. The movement of the piston directly actuates the trigger valve pin located in the pneumatic tool.

Abstract: A fastener driving apparatus for driving fasteners into a substrate. The fastener driving apparatus is a combination of a motor driven linear motion converter; a compression cylinder; an expansion cylinder and a valve arrangement. The linear motion converter converts a rotational motion of a motor to a linear motion of a compression piston within the compression cylinder causing a gas within the compression cylinder to be compressed. The compressed gas is communicated to the expansion cylinder through the valve arrangement wherein the compressed gas expands causing an anvil coupled to an expansion piston within the expansion cylinder to move axially. The axial movement of the anvil causes a fastener to be driven into the substrate. The fastener driving apparatus is an ergonomically designed portable hand held tool providing comfort to a user, meeting safety standards and performance efficiency requirements.

Abstract: A fastening tool includes an actuation device configured to actuate a drive engine of the tool to initiate a drive stroke. The actuation device includes a contact trip assembly operatively connected to the movable portion of the nose assembly. The contact trip assembly a lower contact arm connected to the movable portion of the nose assembly biased in the retracted position and movable to the extended position with the moveable portion of the nose assembly, and an upper contact arm operatively connected to the lower contact arm. The actuation device includes a trigger assembly that includes a trigger, a trigger arm pivotally supported by the trigger and configured to interact with the upper contact arm, and a check pawl configured to engage an opening in the upper contact arm when the upper contact arm moves downward to prevent the tool from being operated in a contact trip mode.

Abstract: A fastener driving apparatus includes a power source, a control circuit, a motor, a first cylinder, a first piston, a linear motion converter, a second cylinder, a second piston, an anvil, a retention element retaining a component of the apparatus, and at least one sensor. During a compression stroke, the first piston compresses gas in a first cylinder to a predetermined pressure. Compressed gas is communicated to the second cylinder and the retention force of the retention element is overcome, to release the retained component of the apparatus, thereby causing the second piston to move linearly and enabling the anvil to drive the fastener into the workpiece. During a return stroke of the first piston, a vacuum created in the first cylinder is communicated to the second cylinder, causing, along with an optional other retraction capacity, the second piston and the anvil to retract to their initial positions.

Abstract: An adjusting mechanism for nailing power of nailing gun, comprising: a slot which is arranged in an upper aluminum cap and is co-axial with an air cylinder, so that the balanced valve airtight slides in the slot, the front side of the balanced valve is exposed to a main chamber, and the rear side of the balanced valve encloses with the inner surface of the upper aluminum cap to form a control chamber; the travel distance of the balanced valve is restricted between the cylinder and a cushion seal arranged on the rear surface of the upper aluminum cap, wherein the cushion seal is positioned axial position adjusting mechanism. The present invention has the advantages of capable of adjusting nailing power so as to provide maximum output power and is convenient for adjusting nailing frequencies.

Abstract: A nail gun includes a rotatable shaft which can lock a switch of a trigger of the nail gun in a nail-empty condition. The rotatable shaft has a locking portion and a driven portion extending partly into a nail magazine, such that when a nail pushing member disposed in the nail magazine reaches a predetermined position, the nail pushing member pushes the driven portion to make the rotatable shaft rotate about an axis perpendicular to a marching direction of the nails loaded in the nail magazine. As a result, the locking portion of the rotatable shaft in an initial position and spaced away from the switch will move to a locking position to be engaged with the switch. Therefore, the nail gun can shoot nails continuously until there is totally no nail in the nail gun and the nail gun is locked.

Abstract: A device includes an actuation system with a dose chamber including an inlet for high pressure fluid. A working chamber extends away from the dose chamber. An annular wall separates a portion of the working chamber from the dose chamber such that the dose chamber encompasses the portion of the working chamber. In use an item to be driven along the working chamber is at least partially within the surrounded portion of the working chamber with the item at one end of its travel in the working chamber. A valve mechanism selectively allows high pressure fluid from the dose chamber to flow into the piston chamber.