Boring or penetrating the earth – Convertible
Patent
1980-02-07
1981-10-27
Novosad, Stephen J.
Boring or penetrating the earth
Convertible
173 29, 173104, 173147, 175103, 175171, E21B 406, E21B 600, E21B 720
Patent
active
042968216
ABSTRACT:
An improved drilling rig (10) and conversion apparatus for drilling rigs is disclosed. The rig includes a percussion assembly (32) rotatably mounted to a ram (30) above the ground in which drilling is to be made. The rig (10) includes a conversion mandrel (40) structured for insection in, and retention by, the percussion assembly (32) in place of a normally retained bit element (34). The mandrel (40) has an anvil surface (56) to which percussive strokes of a piston (50) disposed within the percussion assembly (32) for reciprocating movement therein are applied. The mandrel (40) further includes a hammer portion (68) to transfer both the percussive force of the piston (50) and continuous downward pressure applied to the percussion assembly (32) by the ram 30 to a length of casing (20) encircling the drill rod (22) which accomplishes the drilling. The conversion apparatus can, therefore, convert a bottom-hole drilling rig to a top-of-the-hole rig.
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