Acoustics – Geophysical or subsurface exploration – Seismic wave generation
Patent
1985-12-16
1987-10-06
Jordan, Charles T.
Acoustics
Geophysical or subsurface exploration
Seismic wave generation
181114, 181121, 181401, 367189, G01V 102
Patent
active
046976671
ABSTRACT:
The present invention is an improvement to conventional baseplates for imparting seismic energy to an earth formation. A baseplate typically has a plurality of downwardly disposed triangular prism-shaped cleats for engagement with the earth surface above an earth formation under seismological investigation. At least one leaf spring is supported about midway along its length from the lower surface of the baseplate and between the cleats. An elongate horizontal ejector member is slidably interconnected to the respective ends of the spring. In operation, as the baseplate is lowered into engagement with the earth surface the ejector member is moved upward and the leaf spring is compressed. When the baseplate is lifted upward the restoring force of the leaf spring results in a generally downward force against the ejector member. The ejector member, in turn, exerts a downward force against any earth materials lodged between the cleats to facilitate disengagement of the baseplate from the earth surface and to dislodge any compacted materials from between the cleats.
REFERENCES:
patent: 2986389 (1961-05-01), Coonrad
patent: 4023511 (1977-05-01), Newman
patent: 4135599 (1979-01-01), Fair
patent: 4270626 (1981-06-01), Pritchett
patent: 4284163 (1981-08-01), Pritchett
J. F. Bayhi, A. B. Cunningham and L. L. Lenz, Seismic Data Gathering Techniques, at 47-55 (Sep. 1979) (available from Exxon Production Research Company, Houston, Texas).
Eldred John W.
Exxon Production Research Company
Jordan Charles T.
Phillips Richard F.
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