Pipes and tubular conduits – Plural duct – With spacer and encircling element
Reexamination Certificate
2007-06-05
2007-06-05
Hook, James (Department: 3754)
Pipes and tubular conduits
Plural duct
With spacer and encircling element
C138S113000, C138S114000, C138S108000, C285S123100
Reexamination Certificate
active
11514444
ABSTRACT:
An integrated casing spacer and joint restraint unit is attached to each of a pair of pipe sections adjacent to an end-to-end connection of the pipe sections by means of first and second spacer/retainer ring members. Disposed on the outer periphery of each ring member in a spaced manner are plural risers each having a respective runner disposed on its outer end for engaging an inner surface of an outer casing and maintaining fixed spacing between the inner pipe sections and the outer casing. Plural paired risers, with one riser disposed on each ring member, are aligned with one another along the axis of the connected pipe sections and are each adapted for secure connection to a respective connecting rod for securely coupling the two ring members together and restraining relative movement between the two pipe sections.
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Cascade Waterworks Manufacturing Co.
Hill Thomas E.
Hook James
Wildman Harrold Allen & Dixon
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