Apparatus for wires in the ground

Details Apparatus for wires in the ground Apparatus for wires in the ground

1980-01-15

1981-09-29

Birmiel, Howard A.

Acoustics

Geophysical or subsurface exploration

Seismic wave generation

181114, 181401, 367 75, 173 39, 173 86, 173131, G01V 1147, G01V 1047

Patent

active

042917808

ABSTRACT:
A mobile generator for producing seismic waves in the ground, which includes a mobile four-sided frame, a boom having its lower end pivotally connected to the frame, and a worm gear mounted on the frame such that by rotating the worm gear about its longitudinal axis, the boom is pivoted toward a selected impact position. A hammer, mounted on the boom, is raised and then dropped toward an anvil carried beneath the frame on the ground. The anvil has several impact-receiving surfaces such that either a P wave or a shear wave can be generated by pivoting the boom and without relocating the anvil.
The anvil structure is positioned on the ground by applying a major portion of the weight of the apparatus on the anvil plate.

REFERENCES:
patent: 2990022 (1961-06-01), Muller et al.
patent: 3088385 (1963-05-01), Dorkins et al.
patent: 3393763 (1968-07-01), Sundt
patent: 4059820 (1977-11-01), Turpening
patent: 4064964 (1977-12-01), Norden
patent: 4118994 (1978-10-01), Layotte et al.

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