Core barrel
US3999619A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 30, 1975 |
| Grant date | Dec 28, 1976 |
| Priority date | — |
| Expiry date | May 30, 1995 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23B2251/50
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
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 tooth body having spaced apart surfaces which engage the opposed edges of the notch. Bifurcations extend from the tooth body 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.