Patent US3671829A successfully refreshed from Google Patents.
US3671829A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Moving coil direct reciprocating motor
Assignee: Individual
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Filing: 1970-07-09
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Granted: 1972-06-20
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Expires: 1990-07-09
Abstract
Abstract A direct current reciprocating motor having a coil moving in a magnetic field and a circuit for controlling the flow of current through the coil from a d.c. source in accordance with an alternating flux produced by reversal of direction of current flow through the coil to produce reciprocating movement of the coil. A capacitor whose state of charge varies as a function of the back EMF generated by the coil is connected for controlling the conductivity state of at least one of the transistors as a function of the capacitor''s state of charge.
Inventors
- 👤 Joseph W Mathews
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:55
CPC Classifications
H; H02; H02K; H02K33/00; H02K33/18
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
220 words
A reciprocating d.c. motor comprising: a. an armature coil means including first and second oppositely wound windings; b. a magnetic structure having an air gap adapted to receive said coil; c. shaft means supporting said coil for rectilinear movement in said air gap; d. means connecting one end of each of said windings to one terminal means of a d.c. supply voltage means; e. a first transistor having emitter, base and collector electrodes; f. means connecting the opposite end of the first winding through the emitter-collector electrodes of the first transistor to a second terminal means of said supply voltage means; g. a second transistor having emitter, base and collector electrodes; h. means connecting the opposite end of the second winding through the emitter-collector electrodes of the second transistor to a second terminal of said supply voltage means; i. a first capacitor; j. means responsive to the potential appearing at one of the collector and emitter electrodes of the first transistor for controlling the conductivity state of the second transistor; k. means responsive to the potential appearing at one of the emitter and collector electrodes of the second transistor for controlling the charging and discharging of the first capacitor; and l. means responsive to the charging and discharging of the first capacitor for controlling the conductivity of the first transistor.
Claim 2
Dependent Claim
220 words
A reciprocating d.c. motor comprising: a. an armature coil means including first and second oppositely wound windings; b. a magnetic structure having an air gap adapted to receive said coil; c. shaft means supporting said coil for rectilinear movement in said air gap; d. means connecting one end of each of said windings to one terminal means of a d.c. supply voltage means; e. a first transistor having emitter, base and collector electrodes; f. means connecting the opposite end of the first winding through the emitter-collector electrodes of the first transistor to a second terminal means of said supply voltage means; g. a second transistor having emitter, base and collector electrodes; h. means connecting the opposite end of the second winding through the emitter-collector electrodes of the second transistor to a second terminal of said supply voltage means; i. a first capacitor; j. means responsive to the potential appearing at one of the collector and emitter electrodes of the first transistor for controlling the conductivity state of the second transistor; k. means responsive to the potential appearing at one of the emitter and collector electrodes of the second transistor for controlling the charging and discharging of the first capacitor; and l. means responsive to the charging and discharging of the first capacitor for controlling the conductivity of the first transistor.
Claim 3
Dependent Claim
66 words
A reciprocating d.c. motor as defined in claim 1 wherein the control means includes a second capacitor and means responsive to the potential appearing at one of the emitter and collector electrodes of the first transistor for controlling the charging and discharging of the second capacitor and means for controlling the conductivity state of the second transistor responsive to the second capacitor being charged and discharged.
Claim 4
Dependent Claim
23 words
A reciprocating d.c. motor as defined in claim 1 further including means for limiting the excursion of said shaft in said air gap.
Claim 5
Dependent Claim
18 words
A reciprocating d.c. motor as defined in claim 3 wherein the means for limiting is a compressible load.
Claim 6
Dependent Claim
18 words
A reciprocating d.c. motor as defined in claim 4 wherein the compressible load means comprises a spring means.
Claim 7
Dependent Claim
24 words
A reciprocating d.c. motor as defined in claim 5 wherein said spring means is effective only toward the extremes of traverse of said shaft.
Claim 8
Dependent Claim
39 words
A reciprocating d.c. motor as defined in claim 6 wherein the spring means is carried by said magnetic structure and said shaft includes fixed impact means for engaging said spring means toward the end of traverse of said shaft.
Claim 9
Dependent Claim
20 words
A reciprocating d.c. motor as defined in claim 1 wherein one of said windings includes more turns than the other.
Claim 10
Dependent Claim
35 words
A reciprocating d.c. motor as defined in claim 1 including a third transistor for providing current amplification of the base curreNt supplied to the first transistors as a result of charging of the first capacitor.
Claim 11
Dependent Claim
29 words
A reciprocating d.c. motor as defined in claim 1 including third and fourth transistors connecting for amplifying the signal applied to the base of the first and second transistors.
Claim 12
Dependent Claim
36 words
A reciprocating d.c. motor as defined in claim 10 including third and fourth windings of said coil connected in circuit with the emitter collector electrodes of the third and fourth transistors respectively, and said supply means.
Claim 13
Dependent Claim
30 words
A reciprocating d.c. motor as defined in claim 1 further including a second capacitor connected between the collector electrode of the first transistor and the base of the second transistor.
References Cited (Backward Citations)
US2297084A
Cited
US2776560A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |