US3582875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Geophone device
Assignee: Individual
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Filing: 1968-11-12
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Granted: 1971-06-01
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Expires: 1988-11-12
Abstract
Abstract An improved seismometer or ''''geophone'''' for detecting and measuring subsurface geophysical reflections. The device comprises an outer housing having fixedly disposed therein a central magnet. Disposed about the magnet is circular manner are coil windings. The windings are supported at each end of the magnet and within the housing by cantilever mounted leaf springs, one of the leaf springs being prestressed in tension while the other is prestressed in compression so as to provide a sensitive, freely mounted coil about the magnet.
Inventors
- 👤 Stanley Herbert Van Wambeck
- 👤 Frank Fisher Reynolds Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:56
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/16; G01V1/18; G01V1/181
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
148 words
In an electromechanical transducer for receiving mechanical vibrations and delivering them as an electrical signal comprising: a housing having means therein for creating a reference field, signal producing means resiliently carried by said housing on cantilever mounted spring means and adapted to reciprocally move in an irrotational manner in the reference field, and, electrical cable means operatively connected in the housing so that movement of the signal producing means with respect to the reference field causes transmission of an electrical signal therethrough to a recording system, said cantilever mounted spring means comprising an upper spring assembly engaging said signal producing means for carrying a portion of the weight thereof, and, a lower spring assembly engaging the signal producing means for supporting the remainder of the weight thereof, each of said spring assemblies including two double-clamped cantilever arms mounted such that the deflection imparted to each arm is additive.
Claim 2
Dependent Claim
148 words
In an electromechanical transducer for receiving mechanical vibrations and delivering them as an electrical signal comprising: a housing having means therein for creating a reference field, signal producing means resiliently carried by said housing on cantilever mounted spring means and adapted to reciprocally move in an irrotational manner in the reference field, and, electrical cable means operatively connected in the housing so that movement of the signal producing means with respect to the reference field causes transmission of an electrical signal therethrough to a recording system, said cantilever mounted spring means comprising an upper spring assembly engaging said signal producing means for carrying a portion of the weight thereof, and, a lower spring assembly engaging the signal producing means for supporting the remainder of the weight thereof, each of said spring assemblies including two double-clamped cantilever arms mounted such that the deflection imparted to each arm is additive.
Claim 3
Dependent Claim
142 words
The structure of claim 1 wherein said cantilever mounted spring means comprises an upper spring assembly engaging said signal producing means for carrying a portion of the weight thereof and a lower spring assembly engaging the signal producing means for supporting the remainder of the weight thereof, each of said spring assembly means including first and second cantilever mounted arms, said second arms being affixed to the free end of its respective first arm, the free end of the second arm being directed towards the supported end of its respective first arm to thereby form a fold back relationship between said arms, the free end of each said second arm being affixed to said signal producing means so As to thereby form two double clamped cantilever arms arranged in series such that the deflections of the arms in each assembly are additive.
Claim 4
Dependent Claim
31 words
The structure of claim 2 wherein the physical size and deflection characteristics of each said arms are substantially identical so that movement of said signal producing means is linear and reciprocal.
Claim 5
Dependent Claim
60 words
The structure of claim 2 wherein each said arms include discrete bend means proximate each end thereof, the angle of each said bend means being such that the clamped ends of each arm are parallel but offset with respect to the plane of the other so as to thereby impart to the spring means a predetermined position under static load.
Claim 6
Dependent Claim
49 words
The structure of claim 4 wherein the offset ends of each of said double clamped cantilever mounted arms in said lower spring assembly are arranged in diverging configuration with respect to each other when in the unloaded state so as to thereby function as a compression spring when loaded.
Claim 7
Dependent Claim
49 words
The structure of claim 4 wherein the offset ends of each of said double clamped cantilever mounted arms in said upper spring assembly are arranged in converging configuration with respect to each other when in the unloaded state so as to thereby function as a tension spring when loaded.
Claim 8
Dependent Claim
60 words
The transducer of claim 1 wherein said means for producing a reference field is characterized by a recessed shelf and said resiliently supported signal producing means includes an inwardly directed radial shoulder which is adapted to fit within said recessed shelf while providing a predetermined clearance therebetween to thus prevent excessive longitudinal movement of the resiliently supported signal producing means.
Claim 9
Dependent Claim
44 words
The transducer of claim 1 wherein said housing includes a cable entry means designed to provide a snubbing type engagement of said cables to said housing in order to prevent the transmission of cable strain to the point of electrical connection in the housing.
Claim 10
Dependent Claim
28 words
The transducer of claim 1 wherein said signal producing means includes adjustment means therein for varying its mass in order to effectuate a change in the frequency response.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |