Earth boring auger

Details Earth boring auger Earth boring auger

E - Fixed Constructions

21

B

255/65

E21B 10/44 (2006.01)

Patent

CA 1139300

ABSTRACT OF THE DISCLOSURE In a hollow stem auger for earth boring of the kind having spring loaded valve members at the bottom of the stem to permit the passage of test implements such as corers and vane test implements, interference of the valve members with a test implement is prevented by using an uncoupleable cylin- drical sleeve surrounding the implement which sleeve can be lodged between the valve members to hold them open during use of the implement.

394880

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