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7535351 |
Acoustic intrusion detection system
An active acoustic intrusion detection system includes a pair of dipole emitters (180 degrees out of phase with each other) which emit an audible frequency f (preferably 1 KHz) and a pair of...
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7338398 |
Continuously variable transmission or clutch with ortho-planar compliant mechanism
A continuously variable transmission or clutch device ( 10 ) includes at least one pulley ( 18 ) rotatable on a pivot ( 28 ) and having a pair of adjustable sheaves ( 30, 34 ) including a movable...
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5734626 |
Synchronisation device comprising a time zone detector
The invention concerns a synchronisation device for synchronising the analogue display with the digital display of a timepiece. The device includes a contact wheel (1), driven by the hour-wheel of...
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5555222 |
Low distortion geophone spring
An improved reduced distortion spring spider for geophones is disclosed that has the desired ratio of spurious resonant frequency to the natural frequency of the geophone and can absorb the sharp...
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5450375 |
Geophone shock absorber
A geophone is disclosed that has a cylindrical housing closed at one end by a bottom and the other end by a top. A magnet assembly with pole pieces at each end of the magnet is centrally mounted in...
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5134593 |
Geophone spring
A spring for a seismometer for suspending one body relative to a fixed reference point within a housing including an outer ring and an inner ring interconnected by a plurality of arcuate legs. Each...
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5134594 |
Geophone spring
An improved spring spider for geophones is disclosed that has the desired ratio of spurious resonant frequency to the natural frequency of the geophone and can absorb the sharp lateral forces...
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4685094 |
Lateral compliance device for geophone springs
A spring system for use with a geophone for suspending a reference mass axially and laterally. One spring of the spring system flexes more axially than laterally, and the other spring of the spring...
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4623991 |
Delta-shaped geophone spring
For use in geophones to support either the coil or the permanent magnet, a spring formed from a disc, said spring having an outer ring, an inner ring, and three legs connecting the outer and inner...
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4504932 |
Geophone having a non-conductive coilform
A geophone having a non-conductive coilform thereby avoiding the disadvantages of conductive coilform damping and allowing closer control of both sensitivity and damping solely through shunt...
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4458344 |
Tapered geophone spring
A geophone spring is disclosed in which an inner ring member and an outer ring member are connected by a plurality of leg members. Each leg member includes a tapered segment that is wider at its...
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4412317 |
Transducer for picking up mechanical vibrations, in particular seismic waves, and a seismic measuring system including such a transducer
Transducer for converting mechanical vibrations into corresponding electrical signals. Two separate coils are disposed in permanent magnetic fields produced by a magnet assembly. The coils on the...
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4323994 |
Geophone spring
A new geophone spring is disclosed wherein the outer and inner rings of the spring are connected by leg members having a substantially straight segment which will pivot about an outer portion of...
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4285054 |
Geophone
A geophone comprising an annular coil-mass and a permanent magnet assembly positioned inside the annular coil-mass with their longitudinal axes generally coinciding to place the coil-mass in the...
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3878504 |
Damped geophone
A damped geophone which includes a closed housing wherein a magnet supported between a pair of pole pieces is axially supported on an upstanding post connected with a bottom closure member and...
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2788511 |
Lightweight seismometer
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