Annular casing hammer

Details Annular casing hammer Annular casing hammer

1980-06-23

1982-07-20

Feldbaum, Ronald

Tool driving or impacting

Impacting devices

Impact transmitting anvil

173133, 173134, B23B 4516, B25D 900, B25D 1100, B25D 1300

Patent

active

043401201

ABSTRACT:
A casing hammer for simultaneously driving casing and drilling a water well comprises a housing having an annular pneumatic chamber with an annular piston that drives an annular anvil which seals the lower end of the chamber. The chamber is formed by outer and inner sleeves of which the inner sleeve is fixed to an end cap solely at its rear end and is thus cantilevered from the end cap, being free of connection at its forward end. The forward end of the inner sleeve is stabilized by means of a relatively small clearance between the anvil and the sleeves at the front end of the chamber. The cantilevered connection of the inner sleeve at its rear end provides a smooth and unobstructed bore through which extends a rotating drill string that also extends through casing while the casing is being driven by the annular hammer.

REFERENCES:
patent: 3872934 (1975-03-01), Terada
patent: 4232752 (1980-11-01), Hauk et al.

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