Ram boring machine

Details Ram boring machine Ram boring machine

1987-05-06

1989-05-30

Look, Edward K.

Motors: expansible chamber type

With motive fluid valve

Self-acting valve

137469, F15B 1108

Patent

active

048339741

ABSTRACT:
In a pneumatic ram boring machine for laying pipelines without trenching, which is connected to a source of compressed air by a hose, a valve that suddenly opens automatically at a predetermined pressure is arranged upstream of the striker piston. On opening the valve a pressure wave results which reaches the impact piston almost undamped and prevents it from stopping at a dead center position and not starting.

REFERENCES:
patent: 2287840 (1942-06-01), Stratton
patent: 3025869 (1962-03-01), Kenfield
patent: 3048188 (1962-08-01), Hunter
patent: 3996957 (1976-12-01), Goldish et al.
patent: 4026192 (1977-05-01), Noren
patent: 4266465 (1981-05-01), Gaun
patent: 4563938 (1986-01-01), Henriksson
patent: 4569271 (1986-02-01), Reynolds

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