Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Patent
1984-07-30
1985-10-08
Hoag, Willard E.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Shaping against forming surface
4253871, 425393, 425DIG218, B29C 1500, B29C 1707
Patent
active
045459517
ABSTRACT:
A pipe belling method and apparatus are disclosed which includes an elongated frame to support all of the operating components. A pressure chamber is reciprocal upon frame supported rails between an initial position and a belling position for continuous plastic pipe belling operations. Within the pressure chamber is supported a shaped mandrel to impress a desired hub or bell shape in one previously heated end of a length of pipe. Transverse pipe clamps are carried upon the frame forwardly of the pressure chamber to secure one end of the length of pipe in concentric alignment with the mandrel. When the pressure chamber and the mandrel are urged along the rails to the belling position, the mandrel will be inserted into the heated end of the pipe and a resilient, planar gasket will seal the forward end of the pressure chamber against the pipe clamps and against the pipe itself. When the forward seal has been made up, fluid pressurizing forces are introduced into the pressure chamber to uniformly press the pipe end peripherally about the mandrel to precisely form the desired bell shape. After a sufficient period of time has elapsed to properly form the bell shape, the seal is broken, the pressure chamber and mandrel are reciprocated to their initial positions, the pipe clamps are opened and the pipe with the bell shape is withdrawn from the apparatus.
REFERENCES:
patent: 3672804 (1972-06-01), Dalik
patent: 4157372 (1979-06-01), Kyomen
patent: 4277231 (1981-07-01), Gordon
patent: 4353860 (1982-10-01), Gordon
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