Communications: electrical – Selective – Interrogation response
Patent
1977-02-03
1979-03-13
Blum, Theodore M.
Communications: electrical
Selective
Interrogation response
G01V 116
Patent
active
041445201
ABSTRACT:
A geophone for sensing vibrations having a metal housing, a permanent magnet positioned in the center of the housing with a predetermined spacing between the exterior of the permanent magnet and the housing, a spring assembly having a pair of disc shaped deflectable torsion springs, one of which is located between the top of the permanent magnet and the top of the housing and the other of which is located between the bottom of the permanent magnet and the bottom of the housing, and a coil form fabricated from an electrically conductive material, which coil form is positioned in the predetermined spacing between the housing and magnet and which is adapted to enclose the permanent magnet, the coil form ends being adapted to engage and cooperate with the pair of disc shaped springs for movement of the coil form in a direction substantially parallel to the axis of the permanent magnet and wherein the coil form further includes a surface contiguous the housing defining at one end thereof a pair of spaced parallel axially aligned circumferentially extending walls defining a passageway which encloses a wire coil and having at the other end thereof a solid section formed of the electrically conductive material is shown.
REFERENCES:
patent: 2788511 (1957-04-01), Marshall
patent: 2788512 (1957-04-01), Reichert
patent: 3239804 (1966-03-01), Elskamp et al.
patent: 3349366 (1967-10-01), Hanff
patent: 3602490 (1971-08-01), Mueller et al.
patent: 3913063 (1975-10-01), Sears
Blum Theodore M.
Geo Space Corporation
Meaney, Jr. Daniel J.
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