Driving tools

Details Driving tools Driving tools

1975-04-02

1977-05-31

Purser, Ernest R.

Boring or penetrating the earth

Boring without earth removal

Combined with earth removal

173103, 175 56, 92 75, 173 37, E21B 1102

Patent

active

040263703

ABSTRACT:
A hydraulically actuated driving tool is provided with a ground engageable member which is driven into the ground by the action and reaction of a drive mass which is free to slide within the tool and which is repetitively forced away from and back to the ground engageable member in a manner determined by a hydraulic control system. Each repeated cycle of operation engenders two separate forces to drive the ground engageable member into the ground, one being the force exerted by high pressure fluid in the hydraulic control system when the drive mass is forced away from the ground engageable member and the other being the force exerted when the drive mass impacts back upon the ground engageable member. A switch means is provided whereby the returning drive mass initiates the next cycle of operation of the hydraulic control system.

REFERENCES:
patent: 2748751 (1956-06-01), Johnson
patent: 2758575 (1956-08-01), Wampach
patent: 3262507 (1966-07-01), Hansen
patent: 3529681 (1970-09-01), Berrie
patent: 3650335 (1972-03-01), Lee et al.
patent: 3721095 (1973-03-01), Chelminski
patent: 3833069 (1974-09-01), Back
patent: 3847230 (1974-11-01), Blomquist
patent: 3896701 (1975-07-01), Crewse

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