Pipes and tubular conduits – With closures and plugs – Inflation stem type
Patent
1979-06-08
1981-02-03
Martin, Jr., William D.
Pipes and tubular conduits
With closures and plugs
Inflation stem type
220356, F16L 5510
Patent
active
042482712
ABSTRACT:
A disc shaped cover to seal the open end of a pipe casing and equipped with an integral locking mechanism which fits within the pipe, but which is operable from the exposed face of the cap by use of an appropriate tool. A hollow truncated cone shaped housing projects from one face of the cap cover and fits into the pipe when the cap is installed. A threaded control bolt supported by the cap and housing extends through the center of the housing and may be rotated by the turning of its bolt head centered in the exterior face of the cap. A traveling bushing on the threaded portion of the control bolt within the housing moves toward or away from the cap, depending upon the direction of rotation of the control bolt. Locking arms pivotally attached to the traveling bushing extend radially therefrom and toward the cap cover at an acute angle to the control bolt. The locking arms are of such length that their free ends extend just through the walls of the cap housing when the cap is fully unlocked, and are supported and guided by openings formed in the housing wall. To seal the pipe, the locking cap cover is installed over the pipe opening and the control bolt is rotated by a specially headed wrench to extend the locking arms from the housing until their free ends firmly engage the interior walls of the pipe. The angled engagement of the locking arms prevents the removal of cap housing and the attached cover from the pipe opening.
REFERENCES:
patent: 2512169 (1950-06-01), Nachtigal
patent: 2654620 (1953-10-01), Tinnerman
patent: 2810401 (1957-10-01), Stansbury
patent: 3285289 (1966-11-01), Titus
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