| 摘要 |
A method and apparatus for cutting ice core specimens from a block or sheet of ice, the invention provides swivel cutter elements mounted on the cutter head of an ice coring auger. The swivel cutters each swing into an outwardly extending position against the force of a retracting spring on contact with ice to be cut, the outward movement of the cutters being due to reaction forces acting on the cutters caused by contact with the ice. A core specimen is thereby cut to a desired depth in the ice and advancement of the coring auger is then discontinued although rotation of the auger is continued. While auger rotation continues, each swivel cutter moves inwardly under the force of the retracting spring once the reactive forces caused by advancement of the auger into the ice no longer act on the cutters. This inward movement of the swivel cutters causes a reduced necklike groove to be cut into the ice core specimen at an innermost portion of the specimen, thereby allowing the specimen to be broken away cleanly from the ice block or sheet by simple canting of the ice coring auger. The inward position of the swivel cutters further act to facilitate removal of the ice core specimen by acting to retain the specimen within the barrel of the auger.
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