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: A hand-held endless belt abrading machine comprises a base portion and a main portion, which portion is rotatable relative to the base portion around an axis extending in a forward and rearward direction of the abrading machine. The main portion comprises an air motor having a rotational shaft extending in a direction transverse to the abrading machine and projecting from the left end of the air motor, so that an abrading endless belt assembly drivingly connected to the output shaft is positioned to the left relative to the motor and the base portion which is held by a hand of an operator. When a left-handed person uses the abrading machine, the main portion is turned 180° relative to the base portion to shift the abrading endless belt assembly to the right relative to the base portion, thereby enabling the operator to readily observe the abrading belt assembly in operation.

Abstract: A fuel filling device is provided with a fuel supply adjusting section which adjusts the amount of fuel supplied, a fuel feed line which feeds fuel from a fuel supply adjusting section to a vehicle W, a nozzle removably coupled to vehicle W that supplies fuel from fuel feed line to vehicle W, and a discharge device that discharges fuel present within fuel feed line to the outside to prevent deterioration of packings used in the device in the case of filling a fuel at high pressure, while also facilitate the operation of a filling nozzle.

Abstract: A new type of plug incorporating a normally closed valve for draining oil from an oil pan of a car engine, wherein the normally closed valve is incorporated in a through hole provided as an oil draining path in a bolt type member fixed to the oil pan, an oil draining dedicated jig is assembled to the plug so as to open the normally closed valve in order to drain the oil contained in the oil pan by sucking it with a negative pressure, a movable valve disc member installed in the through hole is installed so that it is engaged with a valve seat provided near the outer end part of the through hole by a coiled spring so as to form the normally closed valve, and the tip end of the plug is made flush generally with the internal surface of the oil pan so as to prevent any structure from projecting toward the inside.

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: There is disclosed a socket for a pipe coupling, comprising a hollow cylindrical socket body including a plug insertion port, a radially movable locking element to lock a plug in the plug insertion port, and a sleeve attached to the socket body so as to be movable forwards/backwards and can operate the locking element. A valve body including a channel hole and purge hole is fixed in the socket body, and a cylindrical seal member rotatable between a first position and a second position is attached between the socket body and valve body. The seal member opens the channel hole and closes the purge hole in the first position, and vice versa in the second position. The seal member is connected to a sleeve for valve opening/closing operation rotatably attached to the socket body by a connection pin inserted through a circumferential groove in the socket body.

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: 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 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 an outer surface thereof and an inner end opening at the inner surface thereof to fluidly communicate with fluid passages of the male and female coupler members.

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: The present invention provides a pipe coupling socket that enjoys improved safety when connected to a plug. This socket comprises a socket body containing a ball valve and having locking elements at its distal end portion, a valve control sleeve fitted on the outer peripheral surface of the socket body for axial movement and capable of actuating the ball valve, a plug connecting sleeve fitted on the outer peripheral surface of the socket body for axial movement and capable of locking and unlocking the plug with the aid of the locking elements, first lock means which prevents the advance of the plug connecting sleeve, second lock means which prevents the retreat of the plug connecting sleeve and the advance of the valve control sleeve, and third lock means which prevents the retreat of the plug connecting sleeve and the valve control sleeve.

Abstract: A pipe coupling comprises a socket including a valve body, socket body having holes, lock balls stored in the holes for pressing the lock balls radially inward at an advanced position and for releasing the lock balls at a retracted position, and a plug having an engaging groove and being adapted to open the fluid passage when the plug is engaged with the socket. The holes in the socket include first and second holes individually extending in the axial direction, the first holes extending closer to the distal end side than the second holes. The valve body is returned to a position in which the fluid passage is closed, when the lock balls are located on the extreme distal end side of the first holes.