Coupling means for horizontal vibrator

Acoustics – Geophysical or subsurface exploration – Seismic wave generation

Patent

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Details

181114, 181119, 181401, G01V 1047

Patent

active

042980860

ABSTRACT:
The present invention relates to means for coupling the horizontally-directed force of a seismic transducer into the earth as a downward going shear wave. The coupling means consists of a plurality of downwardly convergent wedge-shaped earth-engaging cleats mounted on the transducer support means. The cleats differ from each other as to depth and sharpness, the sharper cleats being the deeper ones, so that they contact the earth's surface prior to the blunter ones and penetrate hard surfaces more readily. The blunter cleats, on the other hand, slow the rate of penetration in softer materials and thus prevent bottoming out. The cleats are configured so that the total edge length of the sharper cleats is less than that of the blunter ones, further insuring a high vertical loading on initial contact with hard surfaces. This construction permits efficient coupling into the earth of the horizontal force of a vibrator in soils and other earth materials varying widely in competency while minimizing bottoming out.

REFERENCES:
patent: 2557960 (1951-06-01), Gerhardt
patent: 3046843 (1962-07-01), Rowe
patent: 3159232 (1964-12-01), Fair
patent: 3159233 (1964-12-01), Clynch et al.
patent: 4135599 (1979-01-01), Fair
patent: 4143736 (1979-03-01), Fair

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