Mains bursting tool

Details Mains bursting tool Mains bursting tool

1985-12-18

1987-09-15

Yost, Frank T.

Severing by tearing or breaking

Breaking or tearing apparatus

Movable breaking tool

83180, 138 97, 166 553, 405156, B23P 1702, B26F 300

Patent

active

046934049

ABSTRACT:
A tool has a hollow elongated body 10 made up of a leading section 12 attachable to a tow-cable by a clevis 28, an intermediate section 14 and a trailing section 20 housing a hydraulic cylinder 24 and attachable to a main liner 30. The intermediate section includes a frusto-conical wall in two parts 16 and 18, each of 180.degree. angular extent. The ram 24 operates a wedge 22 longitudinally to move the first part 16 outwardly or inwardly transversely of the body. The parts 16, 18 are slidably trapped to the wedge by slide components projecting into grooves. The tool is pulled by the two cable into the main with the part 16 retracted. Then the part 16 is moved outwardly to burst and enlarge the main, allowing the tool to advance further after retraction of the part 16. The parts 16, 18 each have an external longitudinal rib 68, 70. The part 16 has longitudinal marginal extensions overlapping the longitudinal margins of the part 18.

REFERENCES:
patent: 1588200 (1926-06-01), Skelton
patent: 1785419 (1930-12-01), Moss
patent: 2884066 (1959-04-01), Teplitz et al.
patent: 3181302 (1965-05-01), Lindsay
patent: 3185225 (1965-05-01), Ginies
patent: 3301337 (1967-01-01), Vaughn et al.
patent: 4190293 (1980-02-01), Nieder
patent: 4505302 (1985-03-01), Streatfield et al.

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