Abstract: A pipe coupling apparatus for simultaneously connecting and locking together pipe couplings comprising a plurality of sockets and plugs. The pipe coupling apparatus includes a socket-side unit having a plurality of sockets and a plug-side unit having a plurality of plugs. Each socket is provided with locking elements, and each plug is provided with an engagement groove. When the plug is inserted into the socket, the locking elements enter the engagement groove. A sleeve is provided displaceably between a locking completion position where it holds the locking elements from coming out of the engagement groove to lock the socket and the plug to each other and a retracted position separated from the locking completion position. A locking confirmation plate is displaceable from a locking unconfirmed position to a locking confirmed position when all the sleeves are at the locking completion position, thereby allowing confirmation of the completion of locking.

Abstract: An air pump structured to facilitate the installation of a pair of pistons includes a casing (17) having a pair of cylinder chambers (14) slidably accommodating a pair of pistons (16), respectively, and a drive chamber accommodating electromagnets between the pair of cylinder chambers. The pump casing has mutually opposing side walls and a cylindrical peripheral wall defining the drive chamber. The side walls have circular cylindrical inner peripheral surfaces (28-1) of the cylinders defined therein, respectively. A piston assembly having the pistons connected to the opposite ends of an armature (34) is inserted into the pump casing through one of the cylindrical inner peripheral surfaces and installed therein. The peripheral wall has an electromagnet-loading opening (26-2) through which electromagnet pedestal members (26-7) and the electromagnets are inserted into the casing and secured therein.

Abstract: There is provided a coupling member readily separable from another member even if frozen. A female coupling member has a tubular coupling member fitting portion 22 receiving a male coupling member 14, a recess 22-2 formed on an inner circumferential surface 22-1 of the coupling member fitting portion and having an opening portion 22-4 opening on the inner circumferential surface 22-1 and a bottom portion 22-3, and a plurality of pliable members secured to the bottom portion to extend from the bottom portion to the opening portion so as to be capable of contacting an outer circumferential surface 14-3 of the male coupling member as fitted to the female coupling member.

Abstract: In an endless belt type grinding tool, a tension bar includes a front portion and a rear portion which are divided from each other in a tubular holding portion. The front portion and the rear portion forcibly abut against each other when the endless grinding belt wound around the drive pulley and the idle pulley is applied with a tension by the spring. The endless belt type grinding tool includes a locking member which, when the tension bar is pushed into the tubular holding portion against the spring, engages with the rear portion of the tension bar to retain the rear portion at the pushed position against the urging force of the spring. Thus, in a state in which the grinding belt is removed, it is possible to reduce damage even if the tension bar, which is being pushed in, accidentally jumps out.

Abstract: There is provided an air pump in which vibration noise generated in a drive unit of the pump is suppressed from being transmitted to the outside through a suction passage. A casing of the air pump has a suction port extending from an outer peripheral surface to inner peripheral surface of the casing, a noise reduction wall annularly formed on the outer peripheral surface of the casing such that the suction port opens in a region of the outer peripheral surface of the casing surrounded by the noise reduction wall, and a lid member closing the opening of the top of the noise reduction wall and cooperating with the noise reduction wall and the outer peripheral surface of the casing to define a noise reduction chamber communicating with the suction port. The noise reduction wall has an elongated noise reduction passage extending circumferentially in the noise reduction wall.

Abstract: A vane air motor is disclosed which is configured to prevent grease in a radial bearing from leaking into a rotor chamber. The vane air motor has a motor housing (20) having a rotor chamber, a rotor (22) with vanes (24) disposed in the rotor chamber, a first end wall (16) of the motor housing equipped with a radial bearing (50) rotatably supporting a support shaft portion (28) of the rotor, and a casing contiguously joined to the motor housing to form a compressed air supply chamber (44) together with the first end wall to supply compressed air into the rotor chamber through an air supply hole (46) formed in the first end wall. The first end wall has communication means (16-5, 16-6 and 16-7) for supplying compressed air from the compressed air supply chamber to the side of the first radial bearing closer to the rotor.

Abstract: A male coupling member is configured such that, even if a front end surface of a valve member is hit with a hammer, the valve member cannot bite into an opening surface of a coupling body. The male coupling member has a coupling body, a valve member, and a spring member. The valve member has a front end portion fitted into a front end opening of the coupling body, and a valve body. The front end portion has a circular front end surface, a front end annular surface having a smaller diameter than an opening surface of the coupling body, and a reduced-diameter surface having a smaller diameter than the front end annular surface.

Abstract: A drilling device having an oil supply tank disposed at a position where the oil supply tank is less likely to collide with surrounding objects. This device includes a fixing member (12) fixed to a workpiece, a column (14) extending upward from the fixing member, a tubular slide unit (16) that is slidable along the column, a tool body (18) disposed on the tubular slide unit, and an oil supply tank (20) provided between the tool body and the fixing member and removably fixed to the tubular slide unit. The tool body is provided with a cutting oil supply passage having a cutting oil inlet (109) disposed toward the fixing member, while the oil supply tank is provided with a cutting oil outlet disposed upward. The tool body is displaced upward on the column and the oil supply tank is moved close to the tool body from the lower side of the tool body, whereby the cutting oil outlet of the oil supply tank is connected to the cutting oil inlet of the tool body.

Abstract: An electromagnetic reciprocating fluid device in which a movable member is equipped with permanent magnets, resists a torque rotating the movable member about an axis thereof in the reciprocating direction. The electromagnetic reciprocating fluid device has a pair of electromagnets facing each other, and permanent magnets disposed in a space between the opposed electromagnets and held by a movable member. When an alternating current is applied to coils formed in the electromagnets, a magnetic force is generated between the electromagnets and the permanent magnets, whereby a driving force for reciprocation is applied to the movable member. One end of the movable member is connected to a piston of a first piston-cylinder assembly, while the other end is connected to a piston of a second piston-cylinder assembly.

Abstract: A socket that receives and locks a plug includes a cylindrical socket body having a plug-receiving part, a first through-hole, and a second through-hole rearward of the first through-hole, a plug-locking element movable in the first through-hole between a locking position for preventing the plug from being pulled out and an unlocking position for allowing the plug to be pulled out, a sleeve-operating element movable in the second through-hole, a sleeve provided around the socket body and urged to be displaceable in the longitudinal direction, and a collar urged in the socket body. The socket body has a guide portion located forward of the collar and adjacent to the forward end edge of the collar to prevent the forward end of the plug as inserted into the socket from engaging with the forward end surface of the collar and to guide the forward end of the plug into the collar.

Abstract: A vane air motor configured to prevent uneven wear of vanes is provided. The vane air motor has a cylindrical member having a rotor chamber (19) defined by a circular cylindrical inner peripheral surface (11), and a vaned rotor. A plurality of air discharge openings (50) are provided over a predetermined length range in the axial direction of the rotor chamber. Each pair of axially adjacent air discharge openings are spaced from each other and overlap each other as seen in the circumferential direction of the rotor chamber.

Abstract: A pneumatic tool which can be easily assembled. This pneumatic tool includes a tool housing and an air supply pipe. The tool housing includes a motor housing having a tubular wall, and a tubular air supply/exhaust portion connected to the side surface of the tubular wall and extending rearwardly of the pneumatic tool. The air supply pipe has a valve unit, and is inserted into and set in the air supply/exhaust portion. The air supply/exhaust portion has an air supply passage extending from the motor housing. When the air supply pipe is inserted into and fixed to the air supply/exhaust portion, the forward end portion of the air supply pipe is communicated with a rear end opening of the air supply passage of the air supply/exhaust portion, whereby a compressed air supply passage to an air motor is formed.

Abstract: A pipe coupling member for high-pressure fluid such as liquefied hydrogen includes a seal ring having a highly effective sealing function to prevent leakage of the fluid. The seal ring (72) is set in a seal ring setting space (39) defined by a second radial surface (36) and a seal ring setting surface (38) of a first tubular member (20), a forward end surface of a second tubular member (22), and the outer peripheral surface of a valve seat member (24). A forward end portion of the second tubular member (22) is provided with a communication hole (84) radially penetrating the forward end portion. The pressure of the high-pressure fluid on the downstream side of a valve seat surface (52) causes a fluid path in the second tubular member to be communicated with the sealing ring setting space (39) via the communication hole (84) and via a gap between the seal ring setting surface (38) and the outer peripheral surface of the forward end portion of the second tubular member.

Abstract: A rotationally driven air tool configured to be capable of retaining a lubricant in a gear of a rotation transmitting mechanism as long as possible has an air motor (14), a rotation transmitting mechanism (18) transmitting rotational driving force from a rotational output shaft (12) of the air motor to a rotary tool member (15), e.g. an abrasive disc, and a housing (28) having a motor chamber (20), a rotation transmitting chamber (22), a partition (24) between the motor chamber and the rotation transmitting chamber, and an air blow port (72) provided to extend through the partition to blow air discharged from the air motor toward a peripheral wall surface of the rotation transmitting chamber.

Abstract: An air pump has an air tank (20) for temporarily storing air from a pump unit (12) before discharging the air. The air tank has a tank body having a top wall (40) on which the pump unit is placed, and a peripheral wall (42) extending downward from the top wall. The tank body has a downward facing opening. The air tank further has a metallic bottom wall member (46) engaged with the bottom surface of the peripheral wall so as to close the opening of the tank body. Bolts are passed through the metallic bottom wall member and into a metallic part of the pump unit and tightened to connect and secure the pump unit and the air tank to each other.

Abstract: A socket that receives and locks a plug has a cylindrical socket body, a plug-locking element provided in a first through-hole of the socket, a sleeve-operating element provided in a second through-hole of the socket, a sleeve, and a collar. The collar is movable between a first position (FIG. 1) and a second position where the collar allows radially inward displacement of the sleeve-operating element by the plug inserted into the socket. When the plug is inserted into the socket, first, a locking element-pushing portion of the plug pushes out the plug-locking element into a first recess of the sleeve and causes the plug-locking element to displace the sleeve rearward. As the plug is further inserted into the socket in this state, the plug engages and pushes the collar from the first position to the second position.

Abstract: A pipe coupling including a female pipe coupling member (3) and a male pipe coupling member (5). The female pipe coupling member (3) includes a female member body (11), a locking element hole (13), a locking element (15), and an outer cylindrical member (17) for preventing the locking element from being dislodged from the locking element hole (13). The male pipe coupling member (5) includes a male member body (21), a displacement preventing portion (23), an engaging groove (25), and a sleeve (27). A sleeve receiving portion (19) is formed between an outer peripheral surface (12) of the female member body (11) and the outer cylindrical member (17). The sleeve receiving portion (19) has a jam preventing portion (20) on the radially outer side of an opening edge (13b) of the locking element hole opening at the outer peripheral surface (12) of the female member body (11), whereby the locking element pushed by the sleeve (27) is prevented from being jammed between the opening edge (13b) and the sleeve.

Abstract: A light-weight pneumatic massage apparatus with low operation noise is provided. This apparatus includes a pneumatic massage device and a pump separated from the massage device. The apparatus further includes electromagnetic valves for controlling supply and discharge of pressurized air to and from air chambers of the pneumatic massage device, respectively. Each of the electromagnetic valves includes a displaceable valve member having an armature, and a solenoid for attracting the armature to move the displaceable valve member when a voltage is applied to the solenoid. The apparatus further includes an electromagnetic valve control unit which controls a voltage supplied to the solenoid to open the electromagnetic valves such that the voltage increases from gradually with the passage of time. The armature is attracted onto the end surface of the solenoid within the time period. Then, in a state in which the voltage is reduced to, the armature is maintained attracted onto the solenoid to keep the open state.

Abstract: A coupling member is disclosed which includes a valve device that is axially movable between an open position and a closed position where the valve device closes an annular valve opening defined an outer valve seat portion and an inner valve seat portion. The valve device includes an outer annular sealing member and an inner annular sealing member. The inner annular sealing member includes an annular extending portion configured such that, when the valve device approaches the closed position, the annular extending portion sealingly engages the inner valve seat portion and is elastically bent to allow the valve device advance further to the closed position so that the outer annular sealing member positively engages the outer valve seat portion.

Abstract: A pipe coupling capable of being safely connected and disconnected. The pipe coupling has a tubular housing (16), a first locking member (18), a pressing member (24), a valve member (30), and a second locking member (50) provided between the valve member (30) and the pressing member (24). When the housing is communicated with a fluid source with the pressing member (24) placed in a standby position (FIGS. 1 to 4), the second locking member is displaced by the valve member, which is displaced toward an open position by fluid pressure. In this process, the second locking member engages with the pressing member (24) before the valve member reaches the open position (FIG. 2), thereby preventing the valve member from reaching the open position and, at the same time, preventing the pressing member from being displaced to a pressing position. When the housing is communicated with the fluid source with the pressing member (24) placed in the pressing position (FIG.