Abstract: A pipe coupling comprises a socket including a cylindrical main body having an axial bore for a fluid, an annular valve seat at the forward end, a ball type valve body rotatable relative to the valve seat and having a through hole and a casing fitted over the main body and rotatably retaining the ball valve in cooperation with the valve seat, and a plug inserted in the through hole. The casing has a long hole including a wider area and a narrower area. The ball valve communicates the through hole with the axial bore when the through hole is aligned with the narrower area and closes the axial bore when the trough hole is aligned with the wider area. The coupling comprises a guide for guiding the ball valve along the long hole from a position in which the through hole is aligned with the wider area.

Abstract: A pipe coupling for a female screw to be connected to a female screw port formed in a fluid device, comprising a cylindrical main body. The main body includes a plurality of arm members having a male crew portion at a distal end to be connected to the female screw port. Also, the main body comprises a sliding member that slides from a close to an open position with respect to the arms members. The main body is provided with a lock member for stopping the movement of the sliding member.

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: A torque control type impact wrench includes a first storage section for storing an ideal upper limit of the pulsed torque for screwing a male screw into a female screw, as a first storage value, a second storage section for storing a driving speed at which a driving section drives a torque producing section as a second storage value, and a control section for causing the driving section to drive the torque producing section at the second storage value and stopping the driving section when the pulsed torque exceeds the first storage value, wherein the control section causes the second storage section to store a value, which is larger than the second storage value, as a new second storage value when the pulsed torque does not reach the first storage value within a given time period after the driving section starts.

Abstract: A device for distributing compressed air from a compressed air source to a plurality of apparatus that use compressed air. The device comprises a housing having valve chambers, inlet ports for connecting the valve chambers to the compressed air source, outlet ports, and exhaust ports communicating with outside the device. Each outlet port is adapted to communicate with at least one of the apparatus that use compressed air. Spherical valve bodies movably are provided in the valve chambers, respectively, each for closing one inlet port and one exhaust port. Shafts extend from the valve bodies, respectively. Each shaft has an end portion passing through one exhaust port and protruding from the housing. Electromagnetic actuators are coupled to the end portions of the shafts, respectively.

Abstract: A blower supplies compressed air to a predetermined place. The blower is provided with a plurality of compressors, a common air tank for storing compressed air supplied from the compressors, a changeover valve for switching the compressed air taken in from the air tank between a first supply state and a second supply state, and a controller for controlling operations of the compressors and the switching operation of the changeover valve. The controller can select one operation pattern from among a plurality of operation patterns determined by combinations between the compressors and the changeover valve.

Abstract: A torque control type impact wrench includes a first storage section for storing an ideal upper limit of the pulsed torque for screwing a male screw into a female screw, as a first storage value, a second storage section for storing a driving speed at which a driving section drives a torque producing section as a second storage value, and a control section for causing the driving section to drive the torque producing section at the second storage value and stopping the driving section when the pulsed torque exceeds the first storage value, wherein the control section causes the second storage section to store a value, which is larger than the second storage value, as a new second storage value when the pulsed torque does not reach the first storage value within a given time period after the driving section starts.

Abstract: A compressing device for a pneumatic massager includes a bag body formed of a plurality of airtight cells with sealed portions for separating the airtight cells and adapted to inflate and contract the airtight cells by supplying and discharging compressed air to and from the bag body. At least one of the airtight cells is provided with a port for supplying and discharging compressed air. The bag body is provided with a communicating path allowing communication between the at least one airtight cell and the airtight cells lacking the port.

Abstract: A pipe coupling comprises a cylindrical plug having a peripheral groove formed in an outer peripheral surface, and a socket to be connected to the plug. The socket includes a main body having a receiving hole formed in an end portion thereof for receiving the plug, a sleeve having a front end portion axially slidably inserted in the receiving hole, a base portion located outside the receiving hole, an axial through hole for receiving the plug such that it can slide therein, and a plurality of radial through holes formed therein at circumferentially regular intervals and radially inwardly tapered, and a plurality of lock members received in the radial through holes, part of each of the lock members being able to project into the axial through hole.

Abstract: The present invention provides a pipe coupling socket having a main body containing a plurality of lock balls for locking a plug accepted in the main body. The main body has a projecting lock portion which projects from the outer circumferential surface and has a top surface in which a groove is formed.

Abstract: When a start SW 3 is pressed, a one-shot multivibrator circuit 15 turns on and releases a pulse. The pulse is transmitted to a self-hold circuit 16 which in turn stays in self-hold mode and releases an H level output continuously until it is reset. This cause a transistor 17 to turn on and actuate a ram downward movement relay R1. When the ram arrives at the lower limit of its movement, a lower LS 4 is opened causing a self-hold circuit 21 to produce an H level signal in accordance with an output of a one-shot multivibrator 18. The H level signal from the self-hold circuit 21 is delayed by a delay circuit 22 and turns on a transistor 23. As the result, a ram upward movement relay R2 is actuated. Because of the function of the one-shot multivibrator circuit 15, the ram will not restart when the start SW 3 is continuously depressed. The delay circuit 22 contributes to the longer operational life of a directional valve switching mechanism.

Abstract: A pipe coupling improved in operational and functional characteristics is provided. As an outer sleeve 1 is moved backward, an inner sleeve 9 comes into engagement at its locking balls 62 with the outer sleeve 1 and retracts together with the outer sleeve 1. A slide holder 8 remains urged backward by the inner pressure until the inner pressure drops down to a specific level, thus holding the locking balls 61 in a socket 4 at their radial outward position. As the locking balls 61 interrupt the backward movement of the inner sleeve 9, the outer sleeve 1 is prevented from further moving backward. While the inner sleeve 9 is paused, it interrupts the radial movement of locking balls 63. This permits the locking balls 63 to partially project into the inner side of the socket 4 and come into engagement with an outer groove 200b provided in the outer surface of a plug 200 which is thus locked and not removed out.

Abstract: The operation of an electric drill is inhibited when it is interrupted by an abrupt fault such as power failure and then the fault is recovered, or when the coil of an electromagnet has a trouble such as disconnection.After the fault is eliminated with a power switch 50 remaining closed for energizing the electromagnet and the electric drill, a photocoupler 38 turns on a thyristor 31 to disable the conduction of a transistor 35. As the result, a drill motor 16 will not start before the magnetization of the electromagnet. The trouble in the coil 27 is detected by a potential examining circuit 30 measuring a potential difference across a resistor 31. The detection of the trouble causes the thyristor 31 to interrupt the conduction of the transistor 35. Accordingly, the electric drill will not start again unless it is securely anchored by the electromagnet.

Abstract: When a start SW 3 is pressed, a one-shot multivibrator circuit 15 turns on and releases a pulse. The pulse is transmitted to a self-hold circuit 16 which in turn stays in self-hold mode and releases an H level output continuously until it is reset. This cause a transistor 17 to turn on and actuate a ram downward movement relay R1. When the ram arrives at the lower limit of its movement, a lower LS 4 is opened causing a self-hold circuit 21 to produce an H level signal in accordance with an output of a one-shot multivibrator 18. The H level signal from the self-hold circuit 21 is delayed by a delay circuit 22 and turns on a transistor 23. As the result, a ram upward movement relay R2 is actuated. Because of the function of the one-shot multivibrator circuit 15, the ram will not restart when the start SW 3 is continuously depressed. The delay circuit 22 contributes to the longer operational life of a directional valve switching mechanism.

Abstract: A pipe connector comprises a plug having a groove on the outer periphery of the distal end portion thereof, a socket having an axial hole to receive the distal end portion of the plug and a radial hole, a sealing member attached to the socket and sealing the plug and the socket, a lever pivotally mounted on the socket adjacent the radial hole and having a cam engagable with the groove through the radial hole, the lever being movable to a connected position, a half-connected position and a separated position. The cam is engaged with the groove and the sealing member is pressed, while the lever remains in the connected position, the cam is partly engaged with the groove and the sealing member is free from pressure, while the lever remains in the half-connected position, and the cam is disengaged from the groove, allowing the plug and the socket to move relative to each other, while the lever remains in the separated position.

Abstract: A chamfering apparatus for chamfering a work has an adapter which surrounds a tool support, has one end fixed to a casing and the other end projecting from the casing, and is arranged coaxially with the axis of a rotating shaft. This chamfering apparatus includes an eccentric ring rotatably mounted around the adapter, a lock plate rotatably mounted around the eccentric ring, a work guide attached to the lock plate and having a predetermined guide direction to guide a tool support along the work, and keeping means for keeping the angle between the guide direction of the work guide and the output shaft of a motor at a predetermined value when the lock plate and the work guide are translated with respect to the axis of the rotating shaft by rotating the eccentric ring with respect to the adapter.