Nitto Kohki Co., Ltd.

Reichi Makishima

Yoshikazu Kobayashi

Takeya Sasa

Toshio Mikiya

Naoyuki Kotake

Hidemi Seki

Hideo Ueno

Takeaki Ooshio

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.

Pipe coupling

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.

A pipe connector comprises sockets each having a rear cylindrical member connected to an associated one of first pipes, plugs each having a plug body connected to an associated one of the second pipes, and a locking mechanism, provided on each socket, for locking the associated plug. The pipe connector further comprises an inner cylindrical member having a plurality of housing sections for housing the rear cylindrical members, and a coupling portion for coupling the housing sections, and a main cylindrical member, extending in the axial direction of the housing sections, for movably containing the housing sections. The coupling portion and the main cylindrical member have a pair of holes formed to correspond to each other, one of the pair of holes having a tapered surface inclined with respect to the axial direction. The other of the pair of the holes contains a cam member. When the plug body is locked to the associated socket by the locking mechanism, the cam member is externally driven to cooperate with the tapered surface, thereby moving the main cylindrical member and the inner cylindrical member relative to each other in the axial direction of the housing sections and bringing the plug body and rear cylindrical member into contact with each other in the axial direction thereof.

Pipe connector

A joint for connecting a corrugated pipe to another member includes a cylindrical body having an annular step portion formed in its inner part and adapted to be brought into contact with a front end of a corrugated pipe; a chuck having an annular body which includes a forward end part of an inner diameter substantially equal to or slightly smaller than an outer diameter of the corrugated pipe and which exhibits elasticity by which the chuck can contract and expand in radially inner and outer directions, an engaging portion formed on an inner periphery of its forward end part for engaging an outer periphery of the corrugated pipe, and a locking portion formed on an inner periphery of its rearward end part, the chuck being engaged with the outer periphery of the corrugated pipe in the cylindrical body so as to be capable of moving the corrugated pipe into the cylindrical body integrally with the chuck; and a push cylinder having a counterpart locking portion formed on an outer periphery of its forward end part and adapted to be locked to the locking portion formed on the rearward end part of the chuck, the push cylinder being slidably fitted to an inner periphery of an end portion of the cylindrical body, the push cylinder being for pushing the chuck into the cylindrical body when the push cylinder is advanced.

Joint for connection of a corrugated pipe

An apparatus for connecting two double vacuum pipes for conducting cryogenic fluid consists of a tubular connecting mechanism connected to the outer tube of a double vacuum pipe by a tubular member, a one-touch locking mechanism connected to the outer tube of the other double vacuum pipe by another tubular member inserted in the first-mentioned tubular member, a warming chamber defined between both tubular members, valve mechanisms respectively provided between the tubular members and the inner tubes of the double vacuum pipes which valve mechanisms cooperate to close the inner tubes of the respective double vacuum pipes at the closed position so as to make the inner tube of one of the double vacuum pipes communicate with the warming chamber during the connection of both the double vacuum pipes and to cause the inner tubes of both double vacuum pipes to communicate with each other. During the connection of both double vacuum pipes, cryogenic liquid is introduced in the warming chamber to be evaporated and its temperature is raised to avoid generation of frost on the to-be-connected portions of the double vacuum pipes. A one-touch locking mechanism provides quick connection and disconnection of the double vacuum pipes.

Apparatus for connecting double vacuum pipes for conducting cryogenic

A coupler for sampling specimen comprises a socket having a central hole, a plug insertable in the central hole of the socket, formed therein with a fluid passage for communicating with the interior of the supplying pipe and having a fixed position at which the socket is fixed to said plug, and a valve provided in the plug, adapted to close the fluid passage at the fixed position and having a sampling position at which the valve opens the fluid passage.

Coupler for connecting a specimen sampling bottle to a supplying pipe of

Pipe coupler

The present invention provides a pipe joint apparatus comprising a front cylindrical member arranged on the side of a connecting section for connecting to a second joint member in a first joint means, and connected to the second joint member; a back cylindrical member arranged in the first joint member to be spaced from the front cylindrical member and to be opposite to the front cylindrical member, and connected to the pipe; and a sleeve having both end portions coupled to outer peripheral surfaces of both front and back cylindrical members through the respective spherical rotation portion, and forming a fluid passage enclosing the outer peripheral surfaces of the front and back cylindrical members.

Pipe joint apparatus

A double-pipe pipe coupling comprises a socket provided with a socket main cylinder having a front end portion on which taper holes are formed, locking balls housed in the taper holes and a sleeve on the outer periphery of the front end portion of the socket main cylinder. The plug is provided with a plug main cylinder on which an annular groove is formed. The socket has a cylindrical slide ring and a collar cylinder arranged coaxial to each other, and first and second passages and defined by the side ring and the collar cylinder. The slide ring includes a stopper for stopping the sliding of the slide ring in the axial direction of the socket main cylinder at a certain position and locking the movement of the sleeve when the slide ring advances and a valve member serving to seal the front end of the plug when the plug is connected into the socket. The plug includes a plug main cylinder, a partition wall formed integral with the plug main cylinder and located inside the plug main cylinder and at a position which corresponds to the collar cylinder of the socket, and first and second passages and which are partitioned by the partition wall. First and second slide valves are arranged in the first and the second passage.

Double-pipe pipe coupling

A fluid coupling for a corrugated pipe, comprising a coupling body having an axial through hole including a pipe insertion portion and a fluid passage portion, metallic seal means arranged on the fluid passage side of the pipe insertion portion, for sealing an end portion of a corrugated pipe pressed against the same, clamp means having at least three segments arranged in the circumferential direction and adapted to tightly hold the peripheral portion of the corrugated pipe inserted in the insertion portion, and retaining means for axially and immovably retaining the clamp means so that the end portion of the corrugated pipe is pressed against the seal means, to be sealed thereby.

Fluid coupling

A fluid coupling comprising a coupling body having a cylindrical outer peripheral surface, clamp means for radially and inwardly clamping the outer peripheral surface of an end portion of a pipe, the clamp means beig axially immovable with respect to the pipe, a sleeve having engaging means and slidably fitted on the cylindrical outer peripheral surface of the coupling body, the engaging means being capable of axially moving the clamp means, a spiral guide groove formed on one of the sleeve and the outer peripheral surface of the coupling body, a pin member formed on the other of the sleeve and the outer peripheral surface of the coupling body and slidable along the guide groove, and means for preventing the sleeve and the coupling body from rotating relative to each other at a position reached when the sleeve is moved axially a predetermined distance, as the pin member is guided along the guide groove.

A fluid coupling for a corrugated pipe, comprising a coupling body having an axial through hole and a cylindrical outer peripheral surface, metallic seal means arranged at a pipe insertion portion of the axial through hole, for sealing an end portion of a corrugated pipe, a first sleeve having a first end portion, slidably mounted on the outer peripheral surface of the coupling body and urged axially outward, ring-shaped engaging members adjoining the first end portion of the sleeve and reducible in diameter, and retaining means surrounding the sleeve and the engaging members so as to be movable relative to the coupling body and the sleeve, the retaining means being adapted to reduce the diameter of the engaging members so that the engaging members are forced into root portions of the corrugated pipe, whereby the engaging members are held in a predetermined axial position.

A fluid coupling for a corrugated pipe, comprising a coupling body having a large-diameter portion and a small-diameter portion through which the corrugated pipe can be passed, metallic seal means arranged at the small-diameter portion, for sealing an end portion of a corrugated pipe pressed against the same, a ring-shaped engaging member disposed in the large-diameter portion and having its inside diameter reducible to a size smaller than the diameter of the top of corrugation of the corrugated pipe, and retaining means having an outside diameter small enough to be inserted into the small-diameter portion, an inside diameter large enough to be penetrated by the corrugated pipe, and a first end portion capable of engaging the engaging member, the retaining means being adapted to press the end portion of the corrugated pipe against the seal means, while transferring the elastic member from the large-diameter portion to the small-diameter portion, thereby holding the engaging member in a predetermined axial position such that the engaging member is located in a root portion of the corrugated pipe.

A pipe coupling made up of separably assembled plug and socket in which a latching piece is suspensibly held in the socket in latching engagement with the plug so that finger pressure on the latching piece drives it out of the latching engagement in order to enable easy disassembly of the pipe coupling. A flow rate adjuster piece may be incorporated into the socket so that its axial turing changes the extent of recession of a valve off a valve seat in the plug so that the flow rate can be adjusted while retaining the assembled state of the pipe coupling. Light, compact and cheap construction is assured with simple operation and free flow rate adjustment.

Growing community of inventors

Tokyo, Japan

Reichi Makishima