Abstract: A pipe coupling comprises a socket having a ball valve in which a through bore having one end that allows insertion of a plug is formed and a casing supporting the ball valve for rocking motion. The casing has a slot extending from its flank to the top. The slot has a flank opening and a top opening. The flank opening is wider than the top opening. A lock element is located for movement in the through bore of the ball valve. When the one end of the through bore of the ball valve is aligned with the flank opening, the lock element advances into the flank opening, thereby preventing the ball valve from rocking. When the lock element is pushed into the through bore of the ball valve by the plug, it is disengaged from the flank opening, whereupon the ball valve is allowed to rock.

Abstract: A female coupler and a male coupler of a pipe coupling that are easy to assemble and have a minimized passage resistance are provided. The female coupler includes a cylindrical female coupler body adapted to receive the male coupler from a front end opening thereof. A pipe connection adapter has a cylindrical connecting portion that is inserted into the female coupler body from a rear end opening thereof, and is thus connected to the female coupler body. The pipe connection adapter has two support legs extending from the front end surface of the cylindrical connecting portion. A valve support ring is secured to the distal ends of the support legs. The valve support ring has an outer circumferential surface that has a diameter smaller than the outer diameter of the cylindrical connecting portion, whereby a fluid passage is defined between the outer circumferential surface of the support ring and the wall surface of the through-hole of the female coupler body.

Abstract: An impact tool enables a front cover part to be easily attached to and detached from a housing body, with a device having a simplified structure. The front cover part has an annular fastening portion clamped to the outer peripheral surface of a front edge portion of the housing body, a cylindrical portion extending from the front end of the housing to the region of the fastening portion, and a connecting portion connecting together the cylindrical portion and the fastening portion. The fastening portion is split at a circumferential part thereof to form a pair of circumferentially opposing tongue-shaped portions. A clamping device is provided between the tongue-shaped portions, which is movable between a clamping position where it pulls the tongue-shaped portions toward each other and an unclamping position where the tongue-shaped portions are released from being pulled toward each other.

Abstract: A female or male coupler of a pipe coupling comprises a valve which is located in a fluid passage and is axially movable therein. The valve has a valve head which is provided with a sealing ring to be engaged with and disengaged from a valve seat formed on a wall surface defining the fluid passage of the coupler. The sealing ring is installed in an annular groove formed in the valve head. The bottom, or vicinity thereof, of the annular groove, which is isolated from the outside or the fluid passage by the sealing ring, is fluidly communicated with the exterior surface of the valve via a communication passage formed in the valve. As a result, even if a sudden large decrease in pressure is generated in the fluid passage, a pressure in the bottom, or the vicinity thereof, of the annular groove equalizes with the pressure in the fluid passage.

Abstract: A female coupler suitable for use with a high pressure fluid is provided. The female coupler has locking members or balls adapted to be forced into engagement with a male coupler inserted into the female coupler by a sleeve or outer movable member. The sleeve is held by holding members or balls until the male coupler is inserted into the female coupler and a locking ball receiving recess formed in the exterior surface thereof is brought into a position for receiving the locking balls therein. Accordingly, the sleeve is prevented from moving to a position for forcing the locking ball into the locking ball receiving recess even if the male coupler is suddenly moved out from the female coupler, which is a problem that can occur in prior art female couplers. Further, the sleeve is provided with handle.

Abstract: A rotary cutting apparatus comprises a rotary shaft assembly having an axis and adapted to hold a cutting tool coaxial with the axis and, a feed mechanism for moving the cutting tool held by the rotary shaft assembly along the axis of the rotary shaft assembly. The rotary shaft assembly comprises a proximal rotary shaft, an intermediate, a distal rotary shaft which are successively telescopically connected, and a cylindrical housing rotatably holding the distal rotary shaft and movable along the axis together with the distal rotary shaft. The feed mechanism comprises a first rack mounted on the cylindrical housing and extending in parallel with the axis of the rotary shaft assembly, a second rack securely mounted on the body in parallel with the first rack; and, a pinion positioned between and engaged with the first and second racks.

Abstract: In a second stage of the insertion of a male coupler 1 into a female couple 2, a stationary valve member 5 of the female coupler 1 moves a secondary movable valve member 47 of the male coupler 2 rearwards relative to a primary movable valve member 38 of the same so that the front end portion of the stationary valve member 5 advances into the front end portion of the primary movable valve member 38 and, thus, the interior surface of the front end portion of the primary movable valve member 38 covers and sealingly engages a first sealing ring 13 provided on an outer peripheral portion of the front end portion of the stationary valve member 5 and, simultaneously, a front end portion of a cylindrical coupler body 31 of the male coupler overlaps the exterior surface of the front end portion of the movable valve member 15 of the female coupler so that a second sealing ring 36 provided on the interior surface of the cylindrical coupler body is covered and sealingly engaged by the exterior surface of the movable valv

Abstract: A fluid coupler comprises a ball valve a through hole provided between a female coupler body and a valve holding casing connected to the female coupler body and surrounding the ball. The ball valve has a first flat sliding surface formed on a spherical outer surface of the ball valve which extends in a direction normal to a rotational axis of the ball valve, and a flat stop surface raised from the first flat sliding surface and reaching said spherical outer surface of said ball valve, the first flat sliding surface and the flat stop surface together defining a recess. The valve holding casing has an alignment portion formed on and raised from an interior surface thereof. The alignment portion has a second flat sliding surface slidably engaged with said first flat sliding surface. The flat stop surface is adapted to engage with the alignment portion to limit the rotational movement of the ball valve.

Abstract: A fluid coupler has a female coupler member and a male coupler member which can be connected to the female coupler member by simply inserting into the female coupler member. The female coupler member includes a first locking ball, a second locking ball and a locking ball confining ring. The confining ring has a first slanted inner surface engaging the first locking ball to partly project the first locking ball into a male coupler member receiving hole of the female coupler. The confining ring further has a second slanted inner surface and a locking ball pressing surface extending in parallel with an axis of the male receiving hole. In an insertion operation, the male coupler member first engages the first locking ball to press it against the first slanted surface, thereby axially moving the confining ring.

Abstract: In a second stage of the insertion of a male coupler 1 into a female couple 2, a stationary valve member 5 of the female coupler 1 moves a secondary movable valve member 47 of the male coupler 2 rearwards relative to a primary movable valve member 38 of the same so that the front end portion of the stationary valve member 5 advances into the front end portion of the primary movable valve member 38 and, thus, the interior surface of the front end portion of the primary movable valve member 38 covers and sealingly engages a first sealing ring 13 provided on an outer peripheral portion of the front end portion of the stationary valve member 5 and, simultaneously, a front end portion of a cylindrical coupler body 31 of the male coupler overlaps the exterior surface of the front end portion of the movable valve member 15 of the female coupler so that a second sealing ring 36 provided on the interior surface of the cylindrical coupler body is covered and sealingly engaged by the exterior surface of the movable valv

Abstract: A pipe coupling comprises a socket having a ball valve in which a through bore having one end that allows insertion of a plug is formed and a casing supporting the ball valve for rocking motion. The casing has a slot extending from its flank to the top. The slot has a flank opening and a top opening. The flank opening is wider than the top opening. A lock element is located for movement in the through bore of the ball valve. When the one end of the through bore of the ball valve is aligned with the flank opening, the lock element advances into the flank opening, thereby preventing the ball valve from rocking. When the lock element is pushed into the through bore of the ball valve by the plug, it is disengaged from the flank opening, whereupon the ball valve is allowed to rock.

Abstract: A fluid coupler is provided in which a male coupler is brought into a fixed connection condition in which the male coupler is fixedly connected to a female coupler member and retained at a fixed connection position relative to the female coupler member, the fixed connection condition being cancelled or broken when an excessive tension is applied to a fluid line in which the fluid coupler member is installed such that the tension acts on the male and female coupler members to separate them. A first valve is provided between and slidably engaged with the exterior surface of the male coupler member and the interior surface of the female coupler member. The first valve has a through hole having an outer end opening at the outer surface thereof and an inner end opening at the inner surface thereof to fluidly communicate the fluid passages of the male and female coupler members.

Abstract: An electromagnetic diaphragm pump has two compression sections operated by an AC. Each of the compression sections comprises an oscillator disposed within a housing and holding a permanent magnet, a pair of diaphragms each having a peripheral portion fixed to the housing and a central portion fixed to an end portion of the oscillator, a pair of field cores sandwiching the oscillator and having magnetic poles displaced relative to the permanent magnet by a predetermined amount, coils for producing magnetic fluxes at the field cores, and compression chambers opposed to end portions of the oscillator, one of walls of each of the compression chambers being formed by an associated one of the diaphragms. The field cores have the magnetic poles magnetized by the AC supplied to the coils, whereby the permanent magnet is alternately attracted and repelled by the magnetic poles to vibrate the diaphragms and to vary the volumes of the compression chambers. The two compression chambers share one field core.

Abstract: The inside-outside positional relationship between a field core of an electromagnet and an armature provided on a piston in an electromagnetic pump is reversed as compared with the prior art pump, that is, an annular armature is placed outside and a field core is placed inside the armature. The annular armature attached to the piston reciprocates in the axial direction thereof and the inside surface of the armature is opposed to the outside circumference of the field core of an electromagnet having formed thereon a plurality of outwardly and radially projecting magnetic poles, and being fixed to a part of a casing.

Abstract: An electromagnetic reciprocating pump comprising of a closed-type casing provided with a cylinder in front thereof, a main shaft as least the front end of which is fixed to the casing, a piston having a piston head in front thereof, which piston is slidably fitted over the outer periphery of the main shaft to reciprocate, and coaxially supporting an armature, a spring disposed between the piston and the casing for biasing the piston in one direction, an electromagnet fixed to the casing so as to attract the armature in the opposite direction against the biasing force of the spring, suction ports and suction valves for sucking a fluid into a pressure chamber defined by the cylinder and the piston head, and a discharge port and a discharge valve for discharging the pressurized fluid from the pressure chamber.