Communications: electrical – Selective – Interrogation response
Patent
1977-08-19
1979-05-01
Blum, Theodore M.
Communications: electrical
Selective
Interrogation response
340 17SP, G01V 116
Patent
active
041526929
ABSTRACT:
A compact, high sensitivity low distortion seismometer having an elongated tubular outer pole formed of a magnetic material, a magnetic assembly located in the interior of the outer pole and having a permanent magnet and a pair of conductive pole pieces electrically and magnetically coupled to the magnet, a coil and mass assembly positioned for vertical and rotational movement relative to the magnetic assembly and which includes a coil form, a pair of conductive preformed springs one of which is fixedly attached to each end of the coil form, a pair of coils having the center thereof axially aligned with the axis of the coil form with one of the coils positioned at each end of the coil form, a pair of commutating rings, one of which is attached to each end of the coil form and in electrical and physical contact with an adjacent spring, a pair of insulators, one of which is attached to each end of the coil form to support and electrically insulate the conductive spring and commutating ring adjacent thereto from the coil form, a pair of O-rings, one of which is positioned at each end of the coil form and adapted to clamp the conductive spring, commutating ring and insulator adjacent thereto into an integral sub-assembly with the coil form, and a top assembly and a bottom assembly each of which include slideable wiping contacts which are slideably electrically connected to the coil and mass assembly and to the magnetic assembly for forming an electrically conductive path through the rotating coil form is shown.
REFERENCES:
patent: 3577184 (1971-05-01), McNeel
patent: 3602490 (1971-08-01), Mueller
patent: 3738445 (1973-06-01), Wilson et al.
Blum Theodore M.
Geo Space Corporation
Meaney, Jr. Daniel J.
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