Patent US4401925A successfully refreshed from Google Patents.
US4401925A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means of energizing vibrating feeders
Assignee: International Comustion Australia Ltd
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Filing: 1980-02-08
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Granted: 1983-08-30
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Expires: 2000-02-08
Abstract
Abstract A method of, and apparatus for, energizing electromagnetic vibrators. An electromagnetic vibrator, driven by an electromagnet, is energized directly from an electric mains supply line carrying alternating current at a particular frequency. The electromagnet is operated at a fraction greater than one-quarter, and preferably equal to two-thirds or two-fifths, of the supply frequency such that the current drawn from the mains supply is substantially alternating current.
Inventors
- 👤 James E. Brander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:20
CPC Classifications
H; H02; H02K; H02K33/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
104 words
In a method of energizing an electromagnetic vibrator of the kind having an electromagnet for driving the vibrator, switching means in series with the coil of said electromagnet, and means for connecting the serially-connected switching means and coil across an alternating current power supply, the improvement comprising operating the switching means at a rate which is an odd fraction, greater than one-quarter, of the alternating current frequency of said power supply so as to cause each successive energization of said electromagnet to be in an alternate direction and exist for at least one half period of the alternating current frequency of said power supply.
Claim 2
Dependent Claim
104 words
In a method of energizing an electromagnetic vibrator of the kind having an electromagnet for driving the vibrator, switching means in series with the coil of said electromagnet, and means for connecting the serially-connected switching means and coil across an alternating current power supply, the improvement comprising operating the switching means at a rate which is an odd fraction, greater than one-quarter, of the alternating current frequency of said power supply so as to cause each successive energization of said electromagnet to be in an alternate direction and exist for at least one half period of the alternating current frequency of said power supply.
Claim 3
Dependent Claim
14 words
A method as claimed in claim 1 wherein said odd fraction is approximately two-thirds.
Claim 4
Dependent Claim
14 words
A method as claimed in claim 1 wherein said odd fraction is approximately two-fifths.
Claim 5
Dependent Claim
23 words
A method as claimed in claim 1, 2 or 3, wherein said electromagnetic vibrator is adapted for use in an electromagnetic vibrating feeder.
Claim 6
Dependent Claim
101 words
In an electromagnetic vibrator comprising an electromagnetic for driving the vibrator, switching means in series with the coil of said electromagnetic, and means for connecting the serially-connected switching means and coil across an alternating current power supply, the improvement wherein means are provided for operating the switching means at a rate which is an odd fraction, greater than one-quarter, of the alternating current frequency of said power supply so as to cause each successive energization of said electromagnet to be in an alternate direction and exist for at least one half period of the alternating current frequency of said power supply.
Claim 7
Dependent Claim
101 words
In an electromagnetic vibrator comprising an electromagnetic for driving the vibrator, switching means in series with the coil of said electromagnetic, and means for connecting the serially-connected switching means and coil across an alternating current power supply, the improvement wherein means are provided for operating the switching means at a rate which is an odd fraction, greater than one-quarter, of the alternating current frequency of said power supply so as to cause each successive energization of said electromagnet to be in an alternate direction and exist for at least one half period of the alternating current frequency of said power supply.
Claim 8
Dependent Claim
15 words
An electromagnetic vibrator as claimed in claim 5, wherein said odd fraction is approximately two-thirds.
Claim 9
Dependent Claim
15 words
An electromagnetic vibrator as claimed in claim 5, wherein said odd fraction is approximately two-fifths.
Claim 10
Dependent Claim
21 words
An electromagnetic vibrator as claimed in claim 5, 6 or 7, wherein said switching means comprises a bidirectional triggerable switching device.
Claim 11
Dependent Claim
17 words
An electromagnetic vibrator as claimed in claim 8 wherein said bidirectional triggerable switching device comprises a TRIAC.
Claim 12
Dependent Claim
24 words
An electromagnetic vibrator as claimed in claim 8 wherein said bidirectional triggerable switching device comprises two silicon controlled rectifiers connected in inverse parallel relationship.
Claim 13
Dependent Claim
21 words
An electromagnetic vibrates as claimed in claim 5 wherein said electromagnetic vibrator is adapted for use in an electromagnetic vibrating feeder.
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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) | 1986-08-29 | 1987-02-28 | 1987-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-29 | 1991-02-28 | 1991-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-29 | 1995-02-28 | 1995-08-30 | $7700.00 | Window Closed / Lapsed |