Protected cutter mounting for drill bits

Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element

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Details

175 53, 175374, E21B 1010, E21B 1020, E21B 1052

Patent

active

042417996

ABSTRACT:
A large diameter earth boring drill bit has a cutter mounting system that protects the cutter mounts from formation damage. The drill bit is of the type having a cutter support plate adapted to be secured to a string of drill pipe. A cutter shell is rotatably mounted on a bearing carrier and supported by a cutter mount that is secured to the cutter support plate. The cutter mount has two legs spaced apart, each leg having a slot for receiving a lug that extends from each end of the bearing carrier. The legs and lugs have apertures, with a wedge connector for insertion through for connecting the bearing carrier to the cutter mount. A protector member extends from at least one end of the bearing carrier, with the lug extending from the protector member into the slot. The protector member has a surface on each side of the lug that extends over and protects the end of the leg on each side of the slot from formation damage.

REFERENCES:
patent: 2215264 (1940-09-01), Fisher
patent: 2325459 (1943-07-01), Zublin
patent: 3747999 (1973-07-01), Justman
patent: 3750772 (1973-08-01), Venter
patent: 3921734 (1975-11-01), Goodfellow
patent: 4089382 (1978-05-01), Pessier

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