Kabushiki Kaisha Komatsu Seisakusho

Hitachi, Ltd.

Dai Nippon Toryo Co., Ltd.

Bridgestone Corporation

Kasei Optonix, Ltd.

Hiroshi Takada

Masaaki Hayashi

Kazuyoshi Tsuneta

Hiroharu Sasaki

Shingo Kato

Yoichi Oba

Shusaku Eguchi

Iwao Kurokawa

Kenzo Hoashi

Masamitsu Kitahashi

Mikio Minonishi

Katuzo Kanda

Tsuyoshi Kano

Kunio Horiai

Shingo Iizumi

Shigeaki Saita

Seiichi Tairaku

Nobukazu Takano

Yasuo Kawada

Masanao Ieyoshi

Nobuhiro Kenmotsu

A processes for adhering a vulcanized rubber to a vulcanized rubber or an unvulcanized rubber. Adhesion of vulcanized rubbers to each other is conducted by using at least one of the vulcanized rubbers before vulcanization thereof according to steps of: (1) laminating a sheet material which can easily be peeled from a surface of a rubber after vulcanization to a rough surface of the rubber before vulcanization, (2) vulcanizing a resultant laminate, (3) removing the sheet material from the vulcanized laminate immediately before adhesion of the vulcanized rubber in the laminate to another vulcanized rubber, and (4) adhering the vulcanized rubbers to each other according to a method of adhesion. The adhering of the vulcanized rubbers to each other is also conducted by using a rubber composition for adhesion inserted between the vulcanized rubbers without procedures using the sheet material. An unvulcanized rubber is used in place of another vulcanized rubber in the process for adhering a vulcanized rubber and an unvulcanized rubber to each other. A rubber composition for adhesion which contains sulfur in an amount greater than that of the vulcanized rubber may be used in the method of adhesion. Various types of rubber products, such as a large size rubber weir, a steep slope conveyor belt, a rubber gasket used for a joint portion of immersed elements for an immersed tunnel, and a retreaded tire, can be produced by using the processes for adhering.

Process for adhering vulcanized rubbers and process for producing rubber products using said process for adhering

Plasma arc welding apparatus and welding method using the same

A low-pressure mercury vapor discharge lamp according to the invention is comprised of a large-stem composed of a flare part and a pinch part to which two pairs of lead wires are pinch-sealed, filament coils mounted between ends of the pairs of lead wires, respectively, two inner tubes each of which is pinch-sealed to the pinch part of the flare-stem with one end opened and the other end enclosing each of the filament coils and is bent in a predetermined shape, and a glass lamp envelope having an end portion sealed to the flare part for forming an air-tight space while enclosing the inner tubes.

Compact fluorescent lamp having bulb base

Pigment-coated phosphors which may be used in the production of a cathode-ray tube of a high contrast for a color television receiver can be produced by adding a pigment and an anionic polymer emulsion to an aqueous suspension of a phosphor and then making the system neutral or weakly acidic or adding a cationic polymer emulsion or carrying out both of these steps so that the phosphor and the pigment may be coated with the polymer.

Process for producing pigment-coated phosphors

An epoxy resin coating composition comprising (i) an epoxy resin containing in the molecule at least 2 epoxy groups and (ii) a reaction product formed by condensing an amino compound containing in the molecule at least 2 nitrogen atoms and active hydrogen atoms bonded thereto with 5 to 30% by weight, based on said amino compound, of at least one compound selected from the group consisting of phenol-carboxylic acids and esters thereof.

Epoxy resin composition cured by reaction product of phenol carboxylic

A chelate-forming two-pack type aqueous resin composition comprising (i) an aqueous dispersion of a resin containing in the molecule at least 2 epoxy groups and (ii) a reaction product formed between an amino curing agent containing in the molecule at least 2 nitrogen atoms and active hydrogen atoms bonded thereto and protocatechuic acid and/or gallic acid is disclosed.

Chelate-forming aqueous resin composition

There is disclosed a pilot head used for laying small-diameter pipes such as gas, water conduits or the like precisely in position in the ground. The pilot head comprises an expandable and contractable pilot jack disposed within a pilot casing, a pivoting cylinder adapted for pivoting said pilot jack in any selected direction in a plane normal to the central axis of the pilot head, and an electromagnetic valve for operating said cylinder. The pilot head further includes a target and a clinometer both for detecting the position and posture thereof.

Pilot head for laying pipes in the ground

There is disclosed a method and apparatus for laying small-diameter gas, water pipes or the like precisely in the ground. Small-diameter pilot pipes are first laid in while at the same time, a pilot head is measured and controlled to make its straight advance. Pipes of a larger diameter are then laid in successively, the pipes being led by the pilot pipes. Concurrent with this, excavated earth is discharged through the laid-in pilot pipes.

Method and apparatus for laying pipes in the ground

There is disclosed a method of laying small-diameter pipes such as gas, water pipes or the like precisely in position in the ground. Small-diameter pilot pipes are first laid in with a pilot head being measured and controlled in order to make its advance straight. Pipes which are larger in diameter than the pilot pipes are then laid in successively, the large-diameter pipes being led by the pilot pipes. A multistage head is used as a head utilized for consolidation of soil and disposed in a following relationship to the pilot pipes, thereby reducing resistance exerted upon the head.

Method of laying pipes in the ground

Growing community of inventors

Yokohama, Japan

Hiroshi Takada