Abstract: A multi-passage tube coupling for coupling a plurality of parallel or concentric tubes or tube passages of a multi-passage tube for supplying a fluid to actuators. The coupling comprises a body and a coupling member, the body having as many passages or holes as the number of the tubes or tube passages of the multi-passage tube. At least one of the tubes or tube passages is coupled to the corresponding actuator through a passage defined in the coupling member.

Abstract: A multi-passage tube coupling for coupling a plurality of parallel or concentric tubes or tube passages of a multi-passage tube for supplying a fluid to actuators. The coupling comprises a body and a coupling member, the body having as many passages or holes as the number of the tubes or tube passages of the multi-passage tube. At least one of the tubes or tube passages is coupled to the corresponding actuator through a passage defined in the coupling member.

Abstract: There is described a fluid pressure booster including a pair of cylinders connected to the opposite sides of a central partition wall of a casing with an inlet port, an outlet port and air exhaust ports, a pair of pistons reciprocable in the cylinders and defining a boosting chamber and a drive chamber in each cylinder, and a switch valve adapted to supply a line air pressure alternately to the drive chambers of the two cylinders, thereby reciprocating the pistons to intensify the fluid pressure in the boosting chambers. The switch valve of the booster is provided with a spool stall preventive means which is arranged to suppress the pressing force on the valve body of the switch valve with the fluid pressure or biasing action of a spring until the valve body reaches the neutral position thereof and to encourage the pressing action on the valve body with a biasing force after reaching the neutral position to prevent stalls of the valve body at that position.

Abstract: A drainage valve unit for use with a casing for collecting a drain includes a valve body adapated to be mounted on the casing and having a fluid passage and a chamber defined therein and communicating with each other, a valve member disposed in the fluid passage and movable axially of the fluid passage for opening and closing the fluid passage, and a pusher body disposed in the chamber and movable axially of the chamber, the pusher body being displaceable from outside of the valve body for causing the valve body to open the fluid passage to discharge the drain from the casing through the fluid passage. The valve member can reliably be moved to open the fluid passage for discharging the drain by pushing the pusher body irrespective of the pressure within the casing. When the fluid passage is opened, the drain can quickly be discharged without falling on the operator's hand and fingers.

Abstract: Disclosed herein is a slide cylinder basically consisting of a cylinder block internally defining a plural number of intercommunicating cylinder bores in parallel relation with each other, a piston and a piston rod fitted in each cylinder bore, and plate-like cross members integrally connecting the respective piston rods at the opposite ends thereof. The drive chambers defined by the pistons are communicated with fluid supply/discharge ports at the opposite ends of one of the piston rods and one of fluid supply/discharge ports provided in the cylinder block, permitting a diversity of piping modes by selective use of these ports. When installed upside down, it is possible to move either the cylinder block or cross plates whichever is desired. The slide cylinder can transfer loads accurately without involving rotational motion. Fixing of a piston against a piston rod is by means of caulking the ends of cylindrical portion of a piston at fixing grooves of a piston rod.

Abstract: A fluid regulator including, in a housing, a nozzle flapper mechanism, a diaphragm displaceable by the nozzle back pressure of the nozzle flapper mechanism, a valve body for controlling fluid communication through a fluid passage in accordance with displacement of the diaphragm, and a sensor for picking up a change in output fluid pressure from the fluid passage as a change in an electric signal. The nozzle flapper mechanism includes an electrostrictive element positioned closely to the nozzle of the nozzle flapper mechanism. Displacement of the electrostrictive element with respect to the nozzle is controlled by a differential signal resulting from comparison between an electric input signal and an electric signal from the sensor. The nozzle back pressure is varied dependent on the displacement of the electrostrictive element for thereby displacing a valve body in the fluid passage until the valve body is brought into equilibrium.

Abstract: An improvement to reduce the size of a directional control valve by providing a plurality of pilot spool valves in a single valve casing. A plurality of valve mechanisms are juxtaposed in a monolithic valve casing by individually inserting valve members in a plurality of parallel valve bores provided in the valve casing. A plurality of cylinders corresponding to the valve bores are pierced in an intermediate plate mounted on the valve casing from that face which comes in contact with the valve casing. The cylinders communicate with each other by means of grooves cut in the aforementioned contacting face and open into the atmosphere through a relief port. The adjoining cylinders are thus brought closer, and the valve bodies are driven by pilot fluid pressure that act on the pistons fitted in the individual cylinders.

Abstract: A cushioning mechanism in a pneumatic cylinder utilizing a supplied air pressure, and a method of cushioning a piston in the pneumatic cylinder. Cushioning chambers are provided at opposite ends of a cylinder body of the pneumatic cylinder. Respective differential pressure valves and relief valves are provided between each of the cushioning chambers and an air supply. A cushioning member is disposed between each cushioning chamber and a cylinder bore. Air supplied under pressure from the air supply is stored in one of the cushioning chambers. When the piston is displaced to push the cushioning member, the air in the cushioning chamber is compressed to cushion the piston. As the cushioning member is moved a prescribed interval, the cushioning chamber is vented to atmosphere.

Abstract: There is described a fluid pressure booster including a pair of cylinders connected to the opposite sides of a central partition wall of a casing with an inlet port, an outlet port and air exhaust ports, a pair of pistons reciprocable in the cylinders and defining a boosting chamber and a drive chamber in each cylinder, and a switch valve adapted to supply a line air pressure alternately to the drive chambers of the two cylinders, thereby reciprocating the pistons to intensify the fluid pressure in the boosting chambers. The switch valve of the booster is provided with a spool stall preventive means which is arranged to suppress the pressing force on the valve body of the switch valve with the fluid pressure or biasing action of a spring until the valve body reaches the neutral position thereof and to encourage the pressing action on the valve body with a biasing force after reaching the neutral position to prevent stalls of the valve body at that position.

Abstract: Described herein is a power feeder for electromagnetic valves, comprising: a solenoid casing having male terminals for an exciting coil in a connecting section on one side wall thereof; a terminal plate having female terminals to be connected to said male terminals and relay terminals consisting of a pair of L-shaped pins electrically connected to the female terminals; and a cover attached to the connecting section in such a manner as to enclose the terminal plate on the connecting section and provided with at least one connector socket at a position opposing one arms of the L-shaped relay terminal pins. This power feeder arrangement permits to couple a connector to the terminal selectively from one of two perpendicularly intersecting directions and to universalize the male terminals of the solenoid as well as the terminal plate to be connected thereto.

Abstract: There is described a ultra-miniature electromagnetic valve assembly smaller than 1 mm in diameter of inlet and outlet ports and having a valve casing of approximately of 10 mm in plan view side length, the valve assembly of the type formed by connecting separately fabricated valve casing and electromagnetic operating section and comprising: an inlet port and an outlet port provided on one side surface of the valve casing; locking projections provided on the opposite side surfaces of said valve casing; and an outer shell member for the electromagnetic operating section, having a notched portion at the inner end of one of side surfaces thereof to evade the inlet and outlet ports and provided with locking windows on the opposite sides of the notched portion and on the other side surface, the locking windows being engageable with the locking projections on the valve casing to connect the electro-magnetic section thereto.

Abstract: In a change-over valve, a valve member consists of a poppet type closure member. A pair of supporting rods are connected to the opposite end portions of the closure member. Guide members made of synthetic resin are connected to the opposite end portions of the supporting rods in order to guide the valve member upon changing over in the directions of fluid flow passages. The guide members prevent the closure member of the valve member from inclined and unstable seating against the valve seats.

Abstract: A three-unit assembly for a pneumatic circuit includes a filter, a regulator and a lubricator, each having a body portion providing an air passageway therethrough. The air passageway of each terminates at respective inlet and outlet ports. Each of these engagement portions being provided adjacent to the inlet and outlet ports and including sloping engagement faces which come together in a somewhat V-shape, and face generally axially opposite the direction in which their respective inlet or outlet port opens. Coupling members are provided with passageways providing communication between the outlet port of one of the filter, regulator and lubricator and the inlet port of the next adjacent one of the filter, regulator and lubricator. Each of the coupling members including a pair of threaded bores which extend generally transversely to the coupling member's passageway.

Abstract: A rodless cylinder having a piston and an operation member slidable along the outer circumferential surface of a cylinder tube, each mounted with permanent magnets, and adapted to move the operation member along the cylinder tube by utilizing the attraction force between these permanent magnets, in which a plurality of individual magnets disposed axially to the cylinder in each of driving and driven magnet rows are arranged such that identical poles of the individual magnets are in adjacent to each other, and both of the driving and driven magnet rows are arranged such that the different poles of the individual magnets in each of the magnet rows are opposed to each other can provide a greater attraction force between the magnet rows with no changes in the size of the magnet and thereby reduce the size of the entire apparatus.

Abstract: The solenoid actuator of this invention is provided with a magnetic flanged member for reinforcing the bobbin structure and reducing the magnetic resistance having a flanged portion and a cylindrical portion and inserted said cylindrical portion, whose inner surface is coated with a thin film made of feeble or non-magnetic and wear-resistant material, into the central aperture in a non-magnetic reel-shaped bobbin wound therearound with an energizing coil, and a movable core inserted into the central aperture in the bobbin is guided along the cylindrical portion of the flanged member, whereby the frictional abrasion caused by the sliding movement between the cylindrical portion of the flanged member and the movable core is suppressed and the frictional force caused by the uneven abutment between the outer surface of the movable core and the inner surface of the cylindrical portion of the flanged member is made relatively small to suppress the reduction of the attraction force between the stationary core and th

Abstract: A solenoid actuator of high performance comprising a coil surrounded externally with a magnetic frame and having a stationary core disposed therein, with a movable core attracted to the stationary core upon energizing the coil being disposed axially slidably, wherein the magnetic frame comprises a pair of magnetic frame parts each fabricated from a sheet material by bending the sheet so as to define a top plate and a bottom plate integrally joined with a side plate for covering the top, bottom and side of the coil, and the pair of magnetic frame parts are assembled to each other with their top plates and bottom plates being overlapped to each other, to thereby provide simplified structure and easy assembling.

Abstract: An electromagnetic switching valve wherein an appropriate relation is set for the resilient forces between a spring for actuating a valve body that closes or releases the passage of fluid and a spring for actuating a movable core that is incorporated with the valve body and moved by electromagnetic operation force, thereby providing a power saving structure with no additional components and increased fluid discharging capacity.

Abstract: A solenoid actuator for use with an electromagnetic valve which includes a magnetic frame for establishing a magnetic circuit around an energizing coil, which is formed by bending a sheet-like magnetic frame constituent plate with an eddy current eliminating slit being defined therein, thereby enabling simplification in structure of the magnetic frame, effective utilization of electric power and reduction in the magnetic resistance, and attaining inexpensive fabrication, great electromagnetic force with electrical power-saving and small magnetic loss.

Abstract: A pipe joint having a radially displaceable clamp ring located within a cylindrical joint casing to circumvent a pipe passage along which a pipe is to be inserted, the clamp ring being movable between an inner concentric position and an outer eccentric position and provided with a sharp edge around the inner periphery thereof. Upon inserting a pipe into the joint casing, the clamp ring is pushed into the inner concentric position to allow passage of the pipe and, as soon as the pipe is fully inserted into a connected position, the clamp ring is pressed toward the outer eccentric position by a spring, clamping the pipe securely in the connected position by the sharp edge on the inner periphery of the ring.

Abstract: A control valve is provided between a direction-changeover valve and an actuator in a fluid-pressure operating system. This control valve includes a body having an inlet and an outlet; a fluid passage interconnecting the inlet and the outlet; a valve body and a valve seat which are cooperative with each other to define a clearance therebetween and positioned within the fluid passage; a spring for resiliently urging the valve body toward a constrictive position to where a diminished clearance is defined between the valve body and the valve seat; and pressure responsive means for displacing the valve body in an opposite direction against the force applied by the spring thereby enlarging the clearance and bringing the valve body to its fully open position. An adjusting rod enabling adjustment of the first position of the valve body is provided, and a pilot piston operates under a pilot fluid pressure applied through a pilot port for forcing the valve body to its fully open position.