Soil moisture tube extraction device

Details Soil moisture tube extraction device Soil moisture tube extraction device

1990-10-26

1991-12-17

Cherry, Johnny D.

Handling: hand and hoist-line implements

Grapple

Socket and slip wedge

B66C 144

Patent

active

050729810

ABSTRACT:
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.

REFERENCES:
patent: 1365357 (1921-01-01), Twiss
patent: 1601369 (1926-09-01), Montgomery
patent: 1660708 (1928-02-01), Grant
patent: 1785644 (1930-12-01), O'Bannon
patent: 2699589 (1955-01-01), Redell
patent: 2781222 (1957-02-01), Smith
patent: 3534996 (1970-10-01), De Witt
patent: 3675278 (1972-07-01), Powell

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