Title: Packing for use in steel-pipe hydraulic testing apparatus

Abstract: A packing for use in a steel-pipe hydraulic testing apparatus, consisting of: an annular body having an annular cut in its inner peripheral portion; a plurality of backing pieces fastened to the wall of the annular cut at a given circumferential spacing and directed in the radial direction; and a plurality of adapter pieces embedded in the inner peripheral walls of the annular body of the packing at a given circumferential spacing and exposed to the annular cut, so that the aforesaid plurality of backing pieces may be each slidable on the surfaces of a pair of adjoining adapter pieces. This packing is contracted due to a hydraulic pressure being applied to the outer periphery of the body of the packing, and as a result the respective adapter pieces will slide on the surfaces of the adapter pieces in the circumferential direction of the packing.

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Inventors: Yoshida, Mitsuo (Osaka, JA)
Furukawa, Wataru (Wakayama, JA)
Yamaguchi, Takashi (Wakayama, JA)
Sasaki, Kazuo (Minoo, JA)

Application Number: 724057
Filing Date: 1976-09-16
Publication_date: 1978-04-25
Assignee: Sumitomo Kinzoku Kogyo Kabushiki Kaisha (Osaka, JA); Kabushiki Kaisha Yamamoto Suiatsu Kogyosho (Toyonaka, JA); Nihon Valqua Kogyo Kabushiki Kaisha (Tokyo, JA)
Primary Class(es): 277/624
Other Classes:
US Patent Ref:

1331360	Feb, 1920	Parsons et al.	277/148.
3356377	Dec, 1967	Voitek	277/137.
3464708	Sep, 1969	Hamilton	277/137.
3970321	Jul, 1976	Dechavanne	277/227.

Other Refs:
Primary Examiner: Aegerter, Richard E.
Assistant Examiner: Footland, L.
Attorney: