Large diameter sampler for gathering an undisturbed sample
US6695078B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 16, 2001 |
| Grant date | Feb 24, 2004 |
| Priority date | — |
| Expiry date | Jun 14, 2021 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B49/02
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A cutting apparatus for use in a sampler is disclosed. The cutting apparatus includes an extension tube having a round unit on a bottom side of the extension tube; a cutting ring located in a bottom portion of a protecting tube; a guide tube which is internally equipped within the cutting ring; a plurality of cutters equipped to an outside of the cutting ring for closing a bottom portion of the sampling tube when the cutting ring is pulled by uplifting an up-lifting rod of the sampler, wherein a plurality of the cutters are uplifted followed by the guide tube and bended according the round unit in order to be gathered and closed; and a connection means for fixing a plurality of the cutters on the cutting ring. A sampler having the cutting apparatus can gather a sample of un-cohesive soil such as a sandy soil without spilling.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.