Retainer sleeve for a rotary bit

Details Retainer sleeve for a rotary bit Retainer sleeve for a rotary bit

E - Fixed Constructions

21

B

E21B 10/44 (2006.01) E21C 35/18 (2006.01)

Patent

CA 2543514

A retainer sleeve for retaining a rotary bit includes a longitudinally slit cylindrical portion defining a longitudinal axis, and at least four circumferentially spaced tabs deformed generally radially inwardly from the cylindrical portion. The sleeve is formed from a sheet of spring steel having a thickness of at least 0.048 inches. Each tab comprises a connector section inclined from the cylindrical portion in a generally radially inward and longitudinally rearward direction and a keeper section extending rearwardly from a free end of the connector section. The keeper section includes a first flat surface facing the axis and oriented parallel thereto, and a second flat surface facing rearwardly and oriented perpendicularly to the axis.

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