| 摘要 |
A core barrel comprises an elongate hollow cylinder having a substantially uniform diameter throughout its length and having apparatus at one end thereof for connection to a kelly. The opposite end of the core barrel cylinder is provided with a plurality of circumferentially spaced apart tooth receiving notches each rectangular in shape and characterized by opposed edges spaced apart a predetermined distance. A core barrel tooth is received in each of the notches of the cylinder, and each tooth comprises a central body portion having spaced apart surfaces which engage the opposed edges of the notch. Opposed lateral flanges extend in the forward and rearward directions from the central body portion of each core barrel tooth along the inner and outer surfaces of the core barrel cylinder. Bifurcations extend from one end of the opposed lateral flanges of each core barrel tooth along the inner and outer surfaces of the core barrel cylinder. Aligned holes are formed through the bifurcations of each tooth and through the portion of the cylinder extending therebetween, and roll pins are utilized to secure the core barrel teeth in the tooth receiving notches of the core barrel cylinder. Each core barrel tooth further comprises a carbide cutting tip which is secured in a notch formed in the tooth body.
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