Patent US3591815A successfully refreshed from Google Patents.
US3591815A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Moving coil electromagnetic vibrators
Assignee: Derritron Ltd
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Filing: 1969-06-10
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Granted: 1971-07-06
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Expires: 1989-06-10
Abstract
Abstract In an electromagnetic vibrator a stationary magnet affords an annular or part annular airgap containing a moving conductor unit capable of vibratory movement about the axis secured to an output member to transmit torsional vibration to a load. Alternating current is passed through the conductor unit in directions substantially parallel to its axis. In one embodiment provision is made for vibratory movement both longitudinally along the axis and angularly about the axis.
Inventors
- 👤 Peter Grootenhuis
- 👤 James Walter Gearing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:51
CPC Classifications
H; H02; H02K; H02K33/00; H02K33/18; B; B06; B06B; B06B1/00; B06B1/02; B06B1/04; B06B1/045; G; G01; G01H; G01H1/00; G01H1/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
128 words
An electromagnetic vibrator for providing torsional vibration about an axis, comprising; a stationary field magnet structure including an inner pole piece of one polarity and an outer pole piece of the opposite polarity, said inner and outer pole pieces fOrming an annular airgap therebetween symmetrical with respect to said axis, an output member mounted to said field magnet structure for transmitting said torsional vibration to a load, a conductor unit movably positioned in said airgap and fixed to said output member and including a plurality of electrical conductors extending substantially parallel to said axis, at least one end conductor electrically interconnecting said electrical conductors, at least one bus bar mounted to said field magnet structure, and flexible connectors connecting said conductors to said at least one bus bar.
Claim 2
Dependent Claim
128 words
An electromagnetic vibrator for providing torsional vibration about an axis, comprising; a stationary field magnet structure including an inner pole piece of one polarity and an outer pole piece of the opposite polarity, said inner and outer pole pieces fOrming an annular airgap therebetween symmetrical with respect to said axis, an output member mounted to said field magnet structure for transmitting said torsional vibration to a load, a conductor unit movably positioned in said airgap and fixed to said output member and including a plurality of electrical conductors extending substantially parallel to said axis, at least one end conductor electrically interconnecting said electrical conductors, at least one bus bar mounted to said field magnet structure, and flexible connectors connecting said conductors to said at least one bus bar.
Claim 3
Dependent Claim
43 words
A vibrator as claimed in claim 1 in which there are a number of end conductors and bus bars, each end conductor connected to a group of electrical conductors, said flexible connectors connecting said groups of electrical conductors in series with one another.
Claim 4
Dependent Claim
19 words
A vibrator as claimed in claim 1 in which the mounting of said output member includes a central pivot.
Claim 5
Dependent Claim
46 words
A vibrator as claimed in claim 1 further comprising mounting means for mounting said output member to said field structure, said mounting means includes a number of beams each connected at one end to said output member and at the opposite end to said field structure.
Claim 6
Dependent Claim
60 words
A vibrator as claimed in claim 4 in which the connections of the beams are made by means of couplings of the type including an annular bush of rubber or like resilient material interposed between inner and outer members each affording a surface of revolution about the axis about which the parts of the coupling turn relatively to one another.
Claim 7
Dependent Claim
34 words
A vibrator as claimed in claim 5 in which each beam extends in a direction having at least a radial component, the axes of the couplings being substantially parallel to that of the airgap
Claim 8
Dependent Claim
77 words
An electromagnetic vibrator as claimed in claim 1 wherein said conductor unit further includes additional electrical conductors extending substantially perpendicular to said vibration axis, said conductor unit is suspended in the airgap so as to be capable of vibratory movement both longitudinally along the axis and angularly about the axis, whereby electrical energization of said additional electrical conductors produces the former mode of vibration and electrical energization of said electrical conductors produces the latter mode of vibration.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |