Abstract: A pneumatic tool is disclosed. The pneumatic tool has a hollow housing with a handle extending therefrom, the handle having a chamber defined therein and an air passage communicating with the housing, an actuating mechanism mounted in the housing to actuate a tool shank and a cap securely attached to said handle to cover the chamber so as to form an oil reservoir in the handle. The pneumatic tool further has a control member mounted in the actuating mechanism to control the opening and closing of a discharge passage formed in the actuating mechanism. The disclosed pneumatic tool can limit the size of the pneumatic tool and let the air completely flow out so as to improve the convenience and operational effectiveness of the pneumatic tool.

Abstract: A particle separator and a pneumatic tool incorporating the same for separating particles from a fluid passed therethrough. The particle separator includes an inlet passageway having an upstream end and a downstream end and an inlet which is in fluid communication with the downstream end of the inlet passageway. A separation passageway is connected to the downstream end of the inlet passageway and connected via a substantially "U"-shaped passageway to a chamber. The inlet passageway, separation passageway, and substantially "U"-shaped passageway are connected in fluid communication to provide a flow path to the chamber. In one embodiment, the chamber of the particle includes a removable plug. In another embodiment, the chamber is vented to provide a bleed-path from the separator passageway to and out of the chamber. Preferably, the bleed-path comprises a labyrinth seal which in a preferred embodiment includes a plug having threads disposed within the chamber.

Abstract: A portable pneumatic tool includes a housing composed of two symmetric half shells or several partially cut-away shells; an air inlet module unit, a valve actuating module unit and an operating (or functioning) module unit fluidically communicated with one another and connected with flexible hoses among the module units; and a shock-absorbing unit retained between the operating module unit and the housing; whereby upon embedding or fixation of all the module units into the corresponding cavities in the shells and upon combination of the shells, a portable pneumatic tool will be instantly obtained having advantages of light weight, shock-absorbable property, easy assembly, lower production cost and convenient maintenance.

Abstract: A pneumatic power wrench having a rotation motor supported in a housing (11), an output shaft (13) for connection to a screw joint to be tightened, a pressure air inlet passage (14) controlled by a throttle valve (18), and an exhaust air outlet passage (16) including an automatic outlet flow restricting valve (26,28,43), wherein the outlet flow restricting valve (26,28,43) comprises a valve seat (26), a freely movable valve element (28,43) co-operating with the seat (26), a first activation surface (45) on the valve element (28,43) communicating with the inlet passage (14) downstream of the throttle valve (18) for exerting a motor feed pressure responsive actuating force on the valve element (28,43) in a direction away from the seat (26), and a bias spring (49) and a second outlet flow responsive activation surface (33) for actuating the valve element (28,43) in a direction toward the seat (26).

Abstract: A rear exhaust device for pneumatic tool, of which the prime feature is that the pneumatic tool has a handle furnished with a control valve; the control valve is mounted in an intake passage of the handle; a threaded sleeve on outer end of the intake passage is connected with an intake connector of an intake pipe; inner end of the intake pipe has a round conduit to be plugged into a cylindrical hole at one end of an intake passage of the dynamic body portion; between the round conduit on inner end of the intake passage in the handle and the outer body portion, an inner exhaust passage is furnished; a compressed air will flow through passages on both sides of a valve seat, an outer exhaust passage, a pressure-shunting ring, and an outer pipe so as to divide the pressure and to provide good intake and exhaust passages to drive the blades and rotor to rotate.

Abstract: A replaceable, flexible and resilient grip is slidably fitted over a generally cylindrical handle portion of a power hand tool housing. In one embodiment, for use with a pistol grip housing with a separable end cap, the grip has a flange which is clamped between the end cap and the barrel of the housing and has lugs which fit in recesses in the barrel and end cap. The grip also has a strap portion which fits between the trigger and the barrel and a flange which fits in a groove adjacent to the barrel. In another embodiment, the tool has an air exhaust port adjacent to the handle portion and the grip defines an exhaust air passage alongside the handle portion, the grip being held in place by a retaining plate.

Abstract: A pneumatic tool includes a housing defining an air inlet and first and second exhaust passages and an air motor fluidly coupled to the air inlet and disposed in the housing. The motor produces exhaust air in operation and is fluidly coupled to the first and second exhaust passages. The tool also includes an exhaust valve carried by housing for selectively opening and closing only the second exhaust passage.

Abstract: A speed adjusting apparatus for a pneumatically driven power tool includes a control valve that is adapted to be mounted rotatably within an intake passageway in an outer housing. A connecting rod extends through a pivot hole in a rear cover, and interconnects the valve and a rotary member that is disposed rotatably on the rear cover in such a manner that the valve rotates synchronously with the rotary member. The rotary member can be rotated to align an intake outlet passageway in the valve with a selected one of a forward passageway and a reverse passageway in the rear cover. When the intake outlet passageway is aligned with the forward passageway, a tool head rotates in a direction. When the intake outlet passageway is aligned with the reverse passageway, the tool head rotates in the opposite direction.

Abstract: A pneumatic fastener driving device includes an energy control assembly constructed and arranged with respect to a passageway leading to a piston pressure chamber to be manually movable between (1) a first position wherein the passageway is opened fully to communicate a pressure reservoir with the piston pressure chamber thereby permitting the air under pressure to communicate with the piston pressure chamber to provide maximum energy to a drive piston and (2) a second position wherein the passageway is at least partially closed restricting a flow of the air under pressure from the pressure reservoir to the piston pressure chamber thereby reducing energy to the piston while the air under pressure is maintained at a predetermined pressure value.

Abstract: The present invention relates to a power tool having a housing, a handle having an inlet passage and an outlet passage extending therethrough, and a pneumatic pressure seal/vibration isolator positioned between the handle. The present invention provides a tool that has an excellent handle to housing seal and does not exhibit heavy vibrations. The present invention is also the vibration isolator that seals the handle to the motor housing and reduces vibrational transmissions to a user. Also disclosed is a power tool having a vibration isolator coupled to the housing and handle, and a mechanism for allowing sliding rotation of the handle relative to the vibration isolator, thereby allowing the handle to point in a different direction other than toward the point of impact.

Abstract: An air ratchet hand tool has an elongated, generally cylindrical handle portion with an axial air inlet passage therethrough, and having an outer surface with two longitudinally extending channels formed therein, each communicating with the air motor. A thermoplastic grip jacket covers the handle portion and cooperates with the channels to form therebetween two exhaust air passages which exit at the distal end of the handle. Longitudinal ribs on the jacket project radially inwardly into engagement with longitudinal recesses in the handle portion to inhibit relative rotational movement, while a lug on the handle portion extends through an opening in the jacket to inhibit relative axial movement. A flexible and resilient trigger cover covers the valve trigger and the jacket opening through which it projects.

Abstract: A pneumatically driven power tool includes a handle with air inlet and outlet passageways therein, and a transverse mounting housing. The mounting housing has a transverse circumferential portion with a rear abutment wall, a rear annular shoulder portion, an intermediate cylindrical wall segment, and a front annular shoulder portion. A rear bearing member and a rear mounting plate are inserted into the circumferential portion to abut respectively against the rear abutment wall and the rear annular shoulder portion, and are secured by a lockpin. A front mounting plate and a front bearing member are inserted into the circumferential portion to abut against the front annular shoulder portion and the front mounting plate, and are secured by another lockpin. A motor cylinder mates with the circumferential portion. A driven shaft is disposed in and is rotatable relative to the cylinder, and is journalled on the front and rear bearing members.

Abstract: A multipurpose air tool (1) having a handle (2) to which a head (3) can be removably attached is disclosed. The head (3) has attached thereto various such tools as a face plate (4) and replaceable nozzles (5). The head (3) is interlocked to the handle (2) by a spigot (19) and bayonet connection (21, 23, 34). A safety interlock (16) prevents operation of the trigger (15) and valve (12) unless the head (3) is correctly positioned on the handle.

Abstract: The present invention is to offer a filter/regulator for pneumatic tool, comprising a pipe with two end openings capable of respectively of jointing the air outlet of air compressor and the intake port of pneumatic tool, a filter core in the pipe, a fixing member to fix the filter core in the pipe, and a rotatable regulating knob with a through hole to pass through a lateral shaft hole on the pipe; based on the foregoing structure of filter/regulator, the filter core in the pipe can filter the oil, moisture and other heterogenities in the air and prevent the said foreign matter and heterogeneities from invading into the pneumatic tool and assure the life and quality of using the pneumatic tool, and the regulating knob can regulate the volume of air flow according to the user's requirement.

Abstract: A pneumatic power tool includes a housing (10) with a pistol handle (11), a pneumatic motor provided in the housing (10), a pressure air inlet passage (13) and an exhaust air passage (14) extending substantially in parallel through the pistol handle (11), and a manually operable throttle valve (12) provided in the housing (10). The pistol handle (11) includes: (i) a tubular stem (20) rigidly secured to the housing (10) and forming a portion of the air inlet passage (13), (ii) a separate hollow grip element (30) surrounding at least partly the tubular stem (20) and defining together with the tubular stem (20) a portion of the exhaust air passage (14), and (iii) a clamping device (22-24,28,29) arranged to detachably secure the grip element (30) to the housing (10).

Abstract: An improved grip structure for a pneumatic tool, in which the grip is furnished with a valve seat mounted with a control valve; the central part of the valve seat has an intake passage, of which the outer end is connected with an intake connector, the valve seat and a ring-shaped groove of the bearing-block hole in the dynamic housing are connected and communicated each other by means of an intake passage.

Abstract: A hand held compressed air power tool is provided with a handle that can axially rotate about an orthogonal axis perpendicular to the tool housing. Thus, the handle can rotate independently of the motor housing thereby allowing the handle to point in a different direction other than toward the point of impact. The tool utilizes a rotational coupling system that allows the handle to rotate while also allowing compressed air to be fed into, and exhausted out of, the tool via the base of the handle.

Abstract: A pneumatic rotary tool capable of operating in forward and reverse directions includes a housing and an output shaft projecting from the housing for transmitting torque to an object. An air motor drives rotation of the output shaft in the forward and reverse directions. Air passages extend from an air inlet to the motor for delivering pressurized air to the motor. One passage delivers air to the motor to power the motor to drive the output shaft in the forward direction and the other passage delivers air to the motor to power the motor to drive the output shaft in the reverse direction. A selector valve is disposed between the air inlet and the air passages such that fluid communication between the air inlet and the air passages is blocked except through the selector valve.

Abstract: A hand held power assisted shears has a piston located in a cylinder formed in a pistol grip body. A trigger controls the position of a hollow shuttle spool rod which slides longitudinally within a hollow piston rod connected between the piston and the blades. The hollow shuttle spool rod carries pressurized working fluid to the piston where it is directed to the space above or below the piston. The piston drives the blades through the piston rod to a position corresponding to the position of the trigger allowing the operator to continuously control the position of the blades and the extent and rate of closure during cutting. The relative position of the shuttle spool rod and the piston rod controls whether the working fluid is directed above or below the piston to open or close the blades. One end of the shuttle spool rod acts as a piston which causes the blades to open automatically when the trigger is released.

Abstract: Pneumatic or pressurized fluid tool, such as a screwdriver, having a control device. The control device includes a pivotally mounted trigger which causes rotation of the motor in a first rotational direction when pivoted in a first direction and which causes rotation of the motor in an opposite rotational direction when pivoted in a second direction opposite to the first direction. The trigger is connected to a piston which is movable in a cylinder. The piston is connected by a rod to a valve and includes a cam. The cam of the piston, cooperating with a plunger, operates a selector so that when the trigger is pivoted in the first direction, compressed air or pressurized fluid is admitted to rotate the motor in the first direction.

Abstract: A pneumatic power wrench which comprises a rotation motor (11) lodged in a housing (10) having air inlet and outlet passages (16, 23) for communicating air to and from the motor (11), respectively, and a power transmission for connecting the motor (11) to an output shaft (14), wherein the air outlet passage (23) comprises an adjustable air flow restricting mechanism (24) in the form of a valve spindle (29) extending substantially longitudinally through the outlet passage (23), an annular valve seat (34), and a valve element (32) supported on the valve spindle (29) for flow restricting cooperation with the valve seat (34). The valve spindle (29) is axially adjustable relative to the valve seat (34) for varying the flow restriction through the outlet flow restricting mechanism (24).

Abstract: A pneumatic power tool comprises a housing (10) with a pistol type handle (11), a motor located in the housing (10), a pressure air inlet passage (13) and an exhaust air passage (14) both extending through the handle (11) in substantially parallel with each other, and a manually operable throttle valve assembly (12) having two in sequence activatable valve elements (51, 53) for smooth starting and slow running of the motor, and a rotatable sleeve (40) for shifting between two positions corresponding to "forward" and "reverse" operation of the tool, respectively.

Abstract: An impulse tool (20) having a housing (22), a motor (26), drive mechanism (30), impulse mechanism (28), trigger mechanism (67), and sensor (32) for automatic shut-off is disclosed. The sensor (32) uses a spring-biased ball (144) that sits on a ball seat (149) adjacent an entry orifice (108) and a spring-biased piston (112) such that when a predetermined non-transient torque is reached, the strength, duration and frequency of pulses of the working fluid entering the entry orifice (108) will lift the ball (144) sufficiently to impose on the piston (112) and to progressively lift the piston (112) to allow the working fluid to a triggering height which starts the shut-off of the impulse tool (20). A delay mechanism is also disclosed that may include a regulator (172), dashpot (170), spring latch (204), and trigger bar (56) or latch. A method of cooling an impulse tool with cold, dense air throughout is also disclosed.

Abstract: A pneumatic impact breaker includes a housing provided at a rear end thereof with at least one handle, a longitudinal cylinder bore formed in the housing, and a hammer piston reciprocally guided in the cylinder bore. A socket is formed in a front portion of the housing for receiving a rear impact receiving end of a working implement. An air distributing valve is located in a rear portion of the cylinder bore and arranged to direct motive pressure air alternatingly to opposite ends of the hammer piston to make the hammer piston reciprocate in the cylinder bore. And a cylinder head forms a closure for the cylinder bore as well as an axial support for the air distributing valve. The cylinder head at least partly extends into the rear portion of the cylinder bore, the housing is formed at the rear end thereof with two parallel wall portions both extending rearwardly beyond the cylinder head, and the at least one handle extends in between the two parallel wall portions.

Abstract: A hand held compressed air power tool is provided with a handle that can axially rotate about an orthogonal axis perpendicular to the tool housing. Thus, the handle can rotate independently of the motor housing thereby allowing the handle to point in a different direction other than toward the point of impact. The tool utilizes a rotational coupling system that allows the handle to rotate while also allowing compressed air to be fed into, and exhausted out of, the tool via the base of the handle.

Abstract: A pneumatic tool (10) is described for diverting exhaust air from an air motor (18) between a rearward opening (22), a forward opening (24), or both, without requiring any disassembly. An exhaust diverting valve selector (26) allows adjustment of the direction of flow as determined by an exhaust diverting valve (60) from the exterior of tool (10). A method of manufacturing a pneumatic tool (10) with an exhaust diverting valve (60) is also disclosed.

Abstract: An ergonomic, hand-held power tool (10) is disclosed having a housing (12) formed to have a main body portion (14) having a cavity (32) and a handle portion (16) coupled to the main portion (14). The main body portion (14) has a first longitudinal axis (66). The handle portion (16) has a second longitudinal axis (68) formed to be at an acute angle (70) with respect to the first longitudinal axis (66). A flexible material (28) may be attached to the handle portion (16) or used to form an exterior coating on the housing (12) to help minimize any vibration transferred to the operator's hand.

Abstract: A device for distributing oil under pressure including a head (2) within which, inside a chamber (24), a shuttle (5) slides provided with a shank (5a) sealingly sliding within an end cap (6) and on whose head surface (19) oil at the feed pressure acts coming from a switch duct (18). The head (2) is provided with a feed hole (8) connected to the chamber (24) and is closed at the other end by a shutter (7) connected to a drain hole (9), while the shuttle (5) is provided with an inner cavity (26) and end ducts (25) and it is shaped so as to have in the chamber (24) opposite transverse surfaces (22, 23) whose difference of area in favour of the surface (23) at the end where the shank (5a) is located is smaller than the area of the head (19) of the latter. A hydraulic hammer including the device is provided with a pair of outflow orifices (17, 20) located so that the first orifice (17) is uncovered by the ram (4) at the end of the return travel and the second orifice (20) at the end of the descending travel.

Abstract: A throttle lever for a paving breaker having rear housing bore. A valve assembly housing plug is removably inserted into the bore. A backhead plate retains the valve assembly housing plug in the bore. An elongated throttle lever has a first end pivotally trapped between the backhead plate and the valve assembly housing plug. A second end of the throttle lever extends above the backhead plate, and forms an operator contact surface. An intermediate portion between the first end and second end of the throttle lever operably contacts a fluid inlet valve.

Abstract: In a safety device for a nailing machine which has a compressed air introducing opening for introducing a compressed air therefrom and an air chamber for storing compressed air introduced from the compressed air introducing opening, the safety device comprises a compressed are passage, a relief valve and a spring. The compressed air passage is provided close to an inner side of the introducing opening, and communicates with the air chamber. The relief valve serves to release the compressed air within the air chamber outside, and has a valve housing, an air leak hole and a valve stem. One end of said valve housing is open onto the air chamber, the other end of the valve housing is open onto the introducing opening, a middle portion of the valve housing communicates with the air leak hole which communicates with the outside. The valve stem is slidably accommodated in the valve housing, one end of the valve stem faces the air chamber and the other end thereof faces the introducing opening.

Abstract: The impact tool is provided with a piston (15) oscillating within a cylinder (10). For selecting, with which piston impact surface the piston (15) impacts on the head (7) of a tool holder (2) and accordingly for the selection whether the impact tool generates forward or rearward strikes, respectively, the cylinder (10) is displaced pneumatically between two positions. The displacement occurs depending on the position of a switch (21). This changing of the impact direction is simple and makes it possible to fix the tool holder in the housing (1) making the impact tool sturdy.

Abstract: An impact wrench having an improved air regulator comprises a cylindrical pipe provided on a handle, an air supply valve movably inserted in a back section of the cylindrical pipe, and a changeover valve movably inserted in a front section of the cylindrical pipe. The cylindrical pipe has a first air supply inlet and a second air supply inlet. The air supply valve has several air supply regulating slots of different diameters. The changeover valve has an an air supply reversing slot. The desired one of the air supply regulating slots is adapted to communicate with the first air supply inlet, so that the air flow to the air motor is regulated in the cylindrical pipe, thus obtaing a desired torque. The air supply reversing slot is adapted to communicate with the second air supply inlet only when the air motor is rotated counterclockwise.

Abstract: A pneumatic tool includes a tool housing which is provide with a pneumatic driving unit. The handle of the tool housing has a horizontal blind bore formed therein. An air flow regulating ring for regulating air flow into the interior of the tool housing to activate the driving unit, an air direction control unit for controlling the direction of air flow to the driving unit so as to control the rotation of the driving unit, and a control rod for controlling air flow into the tool housing, are disposed axially inside the blind bore.

Abstract: A pneumatically driven impact type set of tools including a plurality of interchangeable components having, in addition to a manually gripped housing, a common pneumatically driven reciprocating piston actuator assembly, an interchangeable set of tool heads having respectively different types of work tools associated therewith, a removable hand actuated pneumatic valve and one or more extension members which may be selectively coupled between the housing and pneumatic valve. One form of the pneumatic valve includes a safety feature in the handle sub-assembly for preventing inadvertent actuation of the valve upon release of the handle.

Abstract: A rescue tool as incorporated into a portable unit both the tool operating mechanism and the hydraulic power means necessary to provide a self-contained tool. An elongated tool body comprises the rescue tool mechanism and its associated hydraulic actuator unit, an air/oil intensifier pump for driving the hydraulic actuator unit, the control valves for the pump, and an air valve for actuating the hydraulic control valves to their control positions, whereby the only hose connection to the portable unit is a single air hose for supplying high pressure air.

Abstract: A pneumatic power tool includes a housing (10), a motor (14), an air inlet passage (23) in the housing (10) communicating with the motor (14), a pistol type handle (12) extending from the housing (10) perpendicularly to the application direction of the tool, and an air communication arrangement (16, 20, 23) for connecting the air inlet passage (23) to a pressure air supply conduit connected to the tool, wherein the air communication arrangement (16, 20, 23) is separated from the handle (12) and comprises an air supply passage forming member (16) connected to the rear part of the housing (10), and an exhaust air passage (25, 26) having an outlet portion (26) coaxially disposed relative to the air supply passage forming member (16).

Abstract: A device for retaining a depressed reversing valve in the depressed position which is operable by the fingers or thumb of one hand to accomplish both the depressing and locking motions and the unlocking motion when it is desired to return the tool to conventional push to reverse operation. This is accomplished by a notched rotary sleeve mounted to the tool housing.

Abstract: A pneumatically driven impact type of descaler tool includes a manually gripped housing having a rear portion of generally circular cross-section which includes therein a pneumatically driven reciprocating piston assembly which acts as a hammer and a right angled forward portion having a forwardly tapered nose which is particularly adapted for fitting into corners of a workspace. A pivoted solid arcuate body shaped in the form of a quarter circle forms an anvil. A descaling head is secured to the lower end of the anvil and is adapted to be actuated at the other end by the piston assembly which imparts a srelatively strong repetitive impact motion to the descaling head when held against a metal work surface.

Abstract: A safety throttle is provided for a hand held pneumatic tool in which a pivotable intermediate member must be manually moved, by a prior secondary movement, into a slotted throttle lever before the later primary movement of the throttle lever will allow the intermediate member to activate a throttle valve to actuate the pneumatic tool.

Abstract: A pneumatically operated hand-held wire stripping tool having a first housing for supporting operating elements of the tool and a second housing for substantially containing pneumatic elements of the tool is constructed such that the first housing is rotatably coupled to the second housing for rotation into either a left hand or right hand operating position. The operating elements of the tool include a first pair of opposed clamping jaws and a second pair of opposed cutting blades. The jaws and blades are coupled such that initial actuation of the tool closes the jaws and blades and continued actuation displaces the jaws with respect to the blades. The pneumatic elements comprise a pneumatic valve and a diaphragm supported on a stem with the stem extending through the diaphragm and into engagement with one of the operating elements of the tool. An aperture extends coaxially with and substantially through the stem and terminates adjacent the operating element.

Abstract: A pneumatically powered point driver utilizes a valve mechanism having a core that is operated by air conducted therethrough from the supply source. The valve core is preferably provided with an enlarged head, to enhance the rapidity and firmness of the action produced.

Abstract: A rotary vane air motor tool includes an adjustable torque sensing clutch which disengages the tool bit from the air motor and simultaneously closes a normally open valve to the air motor upon reaching a threshold value. A lever or toggle actuated normally closed valve is operable to initiate operation of the tool. The normally closed valve includes an exhaust or bypass passage to permit resetting of the normally open valve.

Abstract: A compressed air supply system for vibro-isolated tools comprises a telescopic-tubular connection between the tool grip and the tool compressed air engine. A cut-off valve is mounted at the inlet to a supply duct through the grip, the outlet of the duct being connected to a pipe of the supply system mounted in the grip by means of an elastic connection. The pipe of the supply system has holes through the wall thereof with increasing diameters which, during motion of the tool housing relative to the compressed air engine, overlap with holes in an intermediate sleeve into which the air supply pipe slidably extends. The intermediate sleeve conveys the air to the air engine.

Abstract: A hand crusher with a main body, which consists of a cylinder unit having a built-in oblong hydraulic cylinder and a parallel plate unit bonded on the periphery of said cylinder unit. Crushing arms are pivotally supported on the lower portion of the parallel plate unit, and the crushing are opened or closed in linkage with a piston rod, which extends from the hydraulic cylinder and makes reciprocal movement along the center line. Slide keys located at the tip of the piston rod engage in guide grooves on the parallel plate unit. A ring-like handle member is rotatably mounted on the rotating unit at the upper end of the cylinder unit, and a left grip and a right grip are connected on both ends of the handle member. On the inner periphery of the rotating unit of the handle member, balls are movably embedded at symmetrical positions, and catching recesses to catch the balls are furnished at every predetermined angle on the outer periphery of the rotating unit.

Abstract: A rotary power tool of the type having a cavity in which is housed a motor containing a rotary shaft is improved by the use of vibration-damping material interposed between the interior of the cavity and the exterior of the motor housing. In one instance of a tool in which the motor is of the air-driven type, the motor housing and casing are ported and the vibration-damping material is configured to enable communication among the ports. In one form of design, the vibration-damping material comprises a sleeve fitting the casing cavity but annularly spacedly surrounding the motor housing but that housing includes axially spaced apart rings of vibration-damping material that tightly encircle the housing and also tightly fit within the sleeve.

Abstract: A single-blow pneumatic percussive tool includes a hollow cylindrical casing (1) having inlet and outlet ports (2, 3). A hammer piston (4) mounted in the casing (1) divides the interior space of the casing (1) into lower and upper chambers (5,6). A working tool (7) is mounted in the casing (1) on the side of the lower chamber (5). A handle (9) having passages and an air distribution device (8) is mounted in the upper part of the casing (1). A sleeve (12) with ports (13) is mounted on the casing (1) to define a space (14) therewith. An air distribution sleeve (15) is axially biased by a spring mounted in the space (14). The outlet ports (3) of the casing (1) are aligned with the ports (13) of the sleeve (12). The air distribution sleeve (15) has radial ports and recesses (17) which are aligned with the radial ports ( 16) on both surfaces of the air distribution sleeve (15). At least one passage (18) is made in the hammer piston (47) which is biased by spring on the side of the lower chamber (5).

Abstract: An improved torque control and fluid shut-off mechanism for a fluid operated tool includes a bit holder and driving clutch member which are connected for uniform cojoint axial movement and independent rotary movement. Spring biased ball bearings provides for cojoint rotary movement which is overcome when the spring biasing force associated with the driving clutch member exceeds a threshold level. A locking sleeve fitted over the driving clutch member cooperates with a control rod for the fluid inlet to the rotary vane air motor to control initiation of operation, termination of operation, and resetting of the tool. A toggle-type trigger controls inlet fluid for forward and reverse operation of the tool.

Abstract: A safety system for automatically preventing over pressure in the interior of a pneumatically operated tool supplied from a source of compressed air includes a safety relief valve detachably connected between the tool and the compressed air source. The safety valve includes a hollow housing having a relief port therein and a resettable valve member is mounted in the housing and movable to open and close the relief port in response to the level of air pressure supplied from the source of compressed air. The housing includes an access opening opposite the relief port and a removable stop member is provided to normally close the access opening and limit the movement of the valve member in a direction inwardly of the housing. The access opening is dimensioned to permit easy insertion and removal of the valve member into and out of the housing.

Abstract: A pneumatic power wrench comprising a housing (10), a rotation motor drivingly connected to an output spindle (11), a pressure air supply passage (22, 24) in the housing (10) connecting the motor to a pressure air source and a manually operable throttle valve (17) disposed in the air supply passage (22, 24) to control the pressure air supply to the motor. An adjustable pressure regulator is arranged in the air supply passage (22, 24) upstream of the throttle valve (17) to provide a desired constant air supply pressure to the motor. The pressure regulator comprises a spring biassed relief valve (32-34) which via a venting passage (42) communicates with the exhaust passage (16) of the tool upstream of a flow restricting silencer (18) mounted therein.

Abstract: A trigger for a fluid operated tool has a control with a pilot valve which when open pressurizes a chamber to cause a throttle valve to open. When closed, the pilot valve restricts fluid flow and reduces fluid pressure in the chamber, permitting the throttle valve to be closed. A continuously variable trigger control is also featured for varying the fluid flow rate to the tool.