Suiken Co., Ltd.

Suiken Technology Co., Ltd.

Hideshige Homma

Tamotsu Yamashita

Toshiyuki Sato

Gumpei Yokoyama

The invention relates to an existing pipe cut-off method and slitting method, by which an existing pipe made of cast iron and steel can be cut off. With a cut-off method according to the invention, first, a part of an existing pipe is enclosed and sealed up by a seal-up housing in an airtight state, a cutting tool having a plurality of blades is accommodated in the corresponding seal-up housing in a state the cutting tool is attached to the abovementioned seal-up housing . Next, the cutting tool is fed toward the center of the abovementioned existing pipe while slitting the existing pipe by rotating the cutting tool by power of a prime mover, and the abovementioned existing pipe is cut off by the cutting tool by turning the abovementioned seal-up housing in the circumferential direction R of the existing pipe

Existing pipe cut-off method, existing pipe slitting method, piping structure, and valve insertion method for inserting a valve in a line without stopping passage of water or fluid

A pipe coupling arrangement for coupling an end of a pipe section includes a coupling body having its open end, into which the end of the pipe section is inserted. An outer ring and a radially compressed inner ring are disposed in the open end of the coupling body. Inclined peripheries are respectively defined in the inner periphery of the outer ring and the outer periphery of the inner ring. These inclined peripheries are inclined so as to become smaller in diameter as they advances towards the open end of the coupling body. The inclined periphery of the outer ring and that of the inner ring are engaged by each other. A pressing means for pressing an outer periphery of the outer ring is provided such that the inner ring is tightly pressed against an outer periphery of the pipe section via the outer ring. A space is defined by the inclined surface of the outer ring and the outer periphery of the pipe section, into which the inner ring is inserted.

Growing community of inventors

Takatsuki, Japan

Hideshige Homma