Pipe severing method and apparatus

Details Pipe severing method and apparatus Pipe severing method and apparatus

1990-10-31

1992-02-11

Phan, Hien H.

Severing by tearing or breaking

Methods

30100, 30101, 83374, 225104, 225105, B26F 300

Patent

active

050869612

ABSTRACT:
A pipe severing device (1) and method utilizing a chain (13) having stress inducing wheels (19) efficiently and safely severs brittle materials including cast iron, vitreous clay, cement and asbestos pipe. The device includes an actuating handle (6) which pivots over a pipe support surface (3). Upon pivoting over the surface, holddown arms (7) attached to the actuating handle frictionally grasp a pipe. The handle may then pivot about a second point or remain rigid, in either case engaging a first limit switch (25) which actuates a hydraulic cylinder (35). The hydraulic cylinder tightens the chain causing the stress inducing wheels to create stress concentration points around the circumference of the pipe. Cracks propagate between stress concentration points, quickly severing the pipe. The pipe support surface includes resilient pads (5a,b) which further frictionally grasp the pipe.

REFERENCES:
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patent: 2949669 (1960-08-01), Wheeler
patent: 3157945 (1964-11-01), Picking
patent: 3244339 (1966-04-01), Carner
patent: 3341098 (1967-09-01), Singley
patent: 3351252 (1967-11-01), Singley et al.
patent: 3763559 (1973-10-01), Axbjer
patent: 3862710 (1975-01-01), Bivona et al.
patent: 4370995 (1983-02-01), Smith
patent: 4535924 (1985-08-01), Quinn
patent: 4663844 (1987-05-01), Vegge

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