US 6,367,849 B1Granted

Joint for corrugated pipe

AssigneeTotaku Industries, Inc.

InventorsYoshiaki Tatsuta, Kazuya Yamashita, Takeshi Mochiduki, Kentaro Takenaka

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Abstract

A joint (and method) connects synthetic resin corrugated pipes, each of the corrugated pipes including a pipe wall having sectionally rectangular wall portions and sectionally circular wall portions disposed alternately in a longitudinal direction of the corrugated pipe. The sectionally circular wall portions each include an annular-shaped protrusion projecting outwardly from the sectionally circular wall portions disposed substantially at a center of the sectionally circular wall portion between adjacent sectionally rectangular wall portions in the longitudinal direction. The joint includes a pair of semicircular-shaped joint main bodies coupled with each other by bolts, each having a recessed groove defined by both of its side edge portions in a width direction thereof and also having tightening bolt holes respectively formed at both peripheral end portions in a peripheral direction thereof, and a pair of watertight packings respectively formed of elastic material and respectively received in the recessed grooves of the semicircular-shaped joint main bodies, each of the watertight packings having a semicircular portion which includes two edge portions disposed at two end portions in a width direction thereof, and a projecting portion disposed between the two edge portions in the width direction and inwardly projected in a radial direction of the pipe.

Claims28

Dependent claims

A joint for connection of synthetic resin corrugated pipes, each of said corrugated pipes including a pipe wall which comprises a sectionally rectangular wall portions and a sectionally circular wall portions disposed alternately in a longitudinal direction of the corrugated pipe, wherein each of said sectionally circular wall portions includes an annular-shaped protrusion which projects outwardly from said sectionally circular wall portions that is disposed substantially at a center of said sectionally circular wall portion between adjacent sectionally rectangular wall portions in the longitudinal direction, said joint comprising:

a pair of semicircular-shaped joint main bodies coupled with each other by bolts, each having a recessed groove defined by both of its side edge portions in a width direction thereof and also having tightening bolt holes respectively formed at both peripheral end portions in a peripheral direction thereof;
and
a pair of watertight packings respectively formed of elastic material and respectively received in the recessed grooves of said semicircular-shaped joint main bodies, each of said watertight packings having a semicircular portion which includes two edge portions disposed at two end portions in a width direction thereof, and a projecting portion disposed between said two edge portions in the width direction and inwardly projected in a radial direction of said pipe,
wherein a thickness of each of said two edge portions in the radial direction is smaller than a height of said side edge portion in the radial direction, whereby, in a state where each of said packings is mounted into said respective joint main bodies and said joint joins said pipes, two side recessed portions into which said annular-shaped protrusions of said pipes are respectively received are formed by said two edge portions,
wherein the surface portions of the two end portions of said packing in the peripheral direction thereof project further outwardly of the surface portions of said two end portions of said joint main body by a predetermined thickness,
wherein each of said watertight packing further comprises flanges disposed at two end portions of said semicircular-portion in a peripheral direction thereof and outwardly projected in the radial direction, and
wherein said surface portions of the two end portions of the packing are formed at outer surfaces of said flanges.

4 more elements

a pair of semicircular-shaped joint main bodies coupled together;
and
a pair of watertight packings respectively received in the recessed grooves of said semicircular-shaped joint main bodies, each of said watertight packings having a semicircular portion which includes two edge portions disposed at two end portions in a width direction thereof, and a projecting portion disposed between said two edge portions in the width direction and inwardly projected in a radial direction of said pipe.

Dependencies are inferred from the claim text.