Static structures (e.g. – buildings) – Striplike unit – reversibly flexible and rigid
Patent
1980-04-14
1982-04-20
Murtagh, John E.
Static structures (e.g., buildings)
Striplike unit, reversibly flexible and rigid
138155, 2541343FT, E04A 1218
Patent
active
043252060
ABSTRACT:
A rigid multi-section split restraining tube is provided for use in manholes for containing the sewer rod, which is used in clearing sewer obstructions, and restraining it against the lateral reaction forces which are set up when the forwardly-driven axially-rotating sewer rod encounters an obstruction. The restraining tube is a series of short sections connected together by rigid links. Each section is split axially into upper and lower half sections, the lower half section being larger than the upper. The upper half section is adapted to be wound up on a reel or drum mounted on the rodding machine and stored. The lower half section, when withdrawn, may preferably be stored in an elongated U-shaped channel on the rodding machine. The upper half section is provided with a pair of lateral extending ears which are received within a pair of opposing curved slots in the sidewalls of the lower half section. The length of an ear in the axial direction may preferably be greater than the width of the curved slot at its narrowest point, thereby to additionally assure prevention of withdrawal of the ears from the slots and separation of the upper and lower interlocked sections in response to lateral forces tending to force separation of the sections.
REFERENCES:
patent: 3805462 (1974-04-01), Caperton
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