Accession Number : ADD001719

Title :   Pipe Closure Apparatus.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C

Personal Author(s) : Wilger,John F ; Uyetake,Tadao S ; Lai,Clifford Y C

Report Date : 17 Jun 1975

Pagination or Media Count : 6

Abstract : The patent relates to a pipe closure apparatus which includes a resilient plug and a threaded shaft which extends axially through the plug. Means are mounted on one end of the shaft to restrain longitudinal movement of the shaft in respect to the resilient plug, and a nut is threaded on the opposite end of the shaft so that upon tightening or loosening the nut the resilient plug expands or retracts respectively. A rigid washer is slidably mounted on the shaft between the nut and the resilient plug for providing bearing surfaces and a distribution of force from the nut to the resilient plug. A cup shaped resilient ring is mounted about the washer. The ring has an exterior diameter which is greater than the resilient plug when the plug is in its retracted condition and is capable of flexing inwardly. With such an arrangement the pipe closure apparatus can be used to seal a pipe from contamination by expanding the plug therein and to wipe the pipe clean with the resilient ring when the plug is retracted and withdrawn. The pipe closure apparatus may also include means for retaining the shaft and selectively tightening or loosening the nut.

Descriptors :   *Ship structural components, *Pipes, *Closures, *Patents, Maintenance, Plugs, Shafts(Machine elements), Seals(Stoppers)

Subject Categories : Marine Engineering
      Pumps, Filters, Pipes, Tubing, Fittings & Vlvs

Distribution Statement : APPROVED FOR PUBLIC RELEASE