Kelly bushing

Details Kelly bushing Kelly bushing

E - Fixed Constructions

21

B

E21B 17/00 (2006.01) E21B 3/04 (2006.01) E21B 41/00 (2006.01)

Patent

CA 2251523

A contact member for a kelly bushing includes in combination a kelly bushing, support members and contact members. The kelly bushing has an interior cavity. The support members are detachably mounted within the interior cavity of the kelly bushing to define a square opening adapted to receive a kelly. Each support member supports a contact member having a planar contact surface . The planar contact surface provides improved contact with the kelly and reduces wear.

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