发明名称 Soil moisture tube extraction device
摘要 A versatile device is provided for securely gripping the outer surface of a cylindrical object and pulling it against a resistant force comprising a sleeve that fits around the cylindrical object and engages its outer surface with gripping jaws when a pulling force is applied. The extractor enables efficient and economical extraction of soil access tubes without tube damage. The device can be operated either with large power equipment or with a manual jack.
申请公布号 US5072981(A) 申请公布日期 1991.12.17
申请号 US19900603505 申请日期 1990.10.26
申请人 THE UNITED STATES OF AMERICA, AS REPRESENTED BY THE SECRETARY OF AGRICULTURE;COLORADO STATE UNIVERSITY RESEARCH FOUNDATION 发明人 WEAVER, BARRY A.;WHITT, DOUGLAS E.
分类号 B66C1/44;E21B19/07 主分类号 B66C1/44
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