Kubota Corporation

Metcal, Inc.

Kubotatekko Kabushiki Kaisha

Muramoto Construction Co., Ltd.

Junsuke Kyomen

Masayuki Sakaguchi

Tadao Yoshizawa

Hidekazu Enomoto

Ryuichi Yoneda

Yoshiaki Hara

Ryozo Ohta

Hideki Kasa

Takashi Tago

Hideaki Iwatake

Ryoichi Takesako

Shunji Horinaka

Katsuro Ishihara

Michio Watanabe

Hiromasa Kawamura

Shinichiro Takai

Keiji Matsumoto

Kenzo Nishitani

Hideki Kajiwara

Shigeru Okusaka

Masakazu Tanaka

Yoshinori Kawamura

Hiroto Fujii

Kazutaka Takada

Permanent form for placing basement concrete wall

Method of manufacturing and joining electro-fusion fitting

A method for producing a synthetic resin union joint, the method including the steps of forming a union nut having a screw portion and a union sleeve of an elastically softenable material, the union sleeve having a union swivel end and a connecting end, heating a length of the union nut at least equal to a thickness dimension of the flange part but not extending to the screw portion so as to elastically soften the length of the union nut, abutting one end of a truncated cone-shaped expansion guide with an end face of the union swivel end, shifting and enlarging the length of the union nut along the expansion guide so as to pass over the union swivel end and so that the union nut passes over the guide, and returning the length of the union nut to its original configuration due to a restoring force of the elastically softenable material so as to be positioned within the union swivel end and the connecting end.

Method for producing synthetic resin union joint

Two plastic tubelike members on which an annular protrusion or an annular groove are respectively provided to be used as two constructive block members for assembling valve or joint devices are directly coupled to assemble such devices. Critical dimensional relationships on the coupling end having the annular groove are established wherein a deformation process can be controlled to engage the annular groove with the annular protrusion by a radially widening motion and an axially spring motion in elastic dynamics, while the coupling end having the annular groove is softened by heating to become elastic. High coupling accuracy can be secured with high coupling strength and durability.

Method for coupling two plastic constructive parts used in valve, joint

For the purpose of making a joint socket comprising at least two portions, namely a portion for receiving a plastic pipe end and another portion into which a rubber ring is fitted, a device for heating and softening a plastic pipe end and enlarging the radius of the softened pipe end to twice its size which includes, an inwardly slanted portion between a first outwardly slanted portion and a second outwardly slanted portion whose radius becomes smaller as it comes nearer to the front end thereof. As the result, the frictional resistance between an improved core and the radius enlarged softened pipe is reduced to a value which enables the device to be operated such that wall-thickened sockets can be made without loss of wall thickness subsequent to the radius enlarging process. The core for forming a molding space includes the first outwardly slanted portion, the inwardly slanted portion and the second outwardly slanted portion and which are necessary to perform the method can be expanded and shrunk so as to pass through the small and large radius portions of the molded socket and has a self-locking mechanism capable of resisting the resistance caused between the forcedly fed pipe and the core.

Molding device for forming a socket end on a plastic pipe

For the purpose of making a joint socket comprising at least two portions, namely a portion for receiving a plastic pipe end and another portion into which a rubber ring is fitted, a method of heating and softening a plastic pipe end and enlarging the radius of the softened pipe end to twice its size which includes, an inwardly slanted portion between a first outwardly slanted portion and a second outwardly slanted portion whose radius becomes smaller as it comes nearer to the front end thereof. As the result, the frictional resistance between an improved core and the radius enlarged softened pipe is reduced to a value which enables the method to be carried out such that wall-thickened sockets can be made without loss of wall thickness subsequent to the radius enlarging process. The core for forming a molding space includes the first outwardly slanted portion, the inwardly slanted portion and the second outwardly slanted portion and which are necessary to perform the method can be expanded and shrunk so as to pass through the small and large radius portions of the molded socket and has a self-locking mechanism capable of resisting the resistance caused between the forcedly fed pipe and the core.

Method of forming a socket end on a plastic pipe and a molding device

A method of molding a connecting socket part on a synthetic resinous pipe, wherein a first internal groove is formed as to be able to seat stably a resilient packing therein, and a second groove also is formed inwardly of the first groove and simultaneously therewith. A resultant molding article is thereby formed in such a manner that the pipe axis of another pipe interconnected therewith is bendable within the above-mentioned second groove. Consequently the circumferential wall of the connecting socket part of the pipe has irregularities yielding to necessity. The metallic core mold used for making up the connecting socket part, for this reason, has a form including some segments which come together to form a surface equivalent in shape to the internal circumferential surface of the connecting socket part which is to be formed. The configuration of the segments thus formed contributes to the smooth operation of assembling the core metallic mold and of dismantling after conclusion of a single operation cycle.

Method of molding a connecting socket part on a synthetic resinous pipe

Growing community of inventors

Sakai, Japan

Junsuke Kyomen