Metal working – Means to assemble or disassemble – Valve applying or removing
Patent
1973-11-19
1978-12-12
Smith, Al Lawrence
Metal working
Means to assemble or disassemble
Valve applying or removing
29401C, B23p 1904, F16l 5518
Patent
active
041289307
ABSTRACT:
A plumbing device includes a radially outwardly and resiliently expansible sealing plug carried on the front end of an elongated axial shaft. An elongated cylinder disposed about the shaft transmits axial movement to the plug from a jack mechanism near the rear end of the shaft so as to cause expansion of the plug into sealing engagement with the inner surface of a pipe in which it is positioned. An external shackle is clamped about the pipe and carries a pair of elongated threaded rods which extend rearwardly beyond the jack mechanism so that a rear lock gate plate can be placed over the axial shaft and secured on each of the threaded rods so as to abut the jack mechanism and so prevent rearward axial displacement of the plug within the pipe under the action of fluid pressure therein. An externally threaded sleeve is freely disposed about the elongated cylinder so that an internally threaded split bushing can be placed about that sleeve and engaged by a front lock gate plate which can also be secured on the threaded rods extending from the pipe-clamping shackle. By alternating the clamping function between the front and rear lock gate plates, it is possible to move a pipe fitting along the device and consequently to remove such a fitting from the end of the pipe and/or to secure a new or replacement fitting on that pipe end.
REFERENCES:
patent: 2141274 (1938-12-01), Lenhart
patent: 2621679 (1952-12-01), Tuttle
patent: 2690612 (1954-10-01), Scott
patent: 3644982 (1972-02-01), Anderson
Peters J. C.
Smith Al Lawrence
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