Pushing or pulling apparatus for pipe, rod or the like

Details Pushing or pulling apparatus for pipe, rod or the like Pushing or pulling apparatus for pipe, rod or the like

1974-10-23

1977-01-04

Smith, Al Lawrence

Implements or apparatus for applying pushing or pulling force

Pipe or rod jack

Tie rod tensioner

E21B 1900

Patent

active

040008797

ABSTRACT:
Apparatus for pushing or pulling a pipe, rod or the like through subterranean areas, such as beneath sidewalks, roadways, etc. It is lowered into a pit and braced against opposing walls thereof by jacking out an extensible frame. Once positioned within the pit, a motor and pump unit supplies hydraulic fluid under pressure to a hydraulic cylinder which reciprocates through a lever arm a gripping means slidably mounted on the frame. When moved in one direction, the gripping means grips the pipe or rod while when moved in the other direction it disengages from the pipe or rod. The pipe or rod is thereby driven longitudinally into the ground. To pull the pipe or rod, the gripping direction of the gripping means is reversed by shifting the gripping member.

REFERENCES:
patent: 1489253 (1924-04-01), Hyotlaine et al.
patent: 2517494 (1950-08-01), Kiss et al.
patent: 2681789 (1954-06-01), Nichols
patent: 2807494 (1957-09-01), Buffer
patent: 2866662 (1958-12-01), Nemeth
patent: 2935298 (1960-05-01), Wilwerding
patent: 3645502 (1972-02-01), Stromp
patent: 3807695 (1974-04-01), Gremillian et al.

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