US3568024A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reversing control for permanent magnet type direct current electric motors
Assignee: Motors Liquidation Co
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Filing: 1968-07-15
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Granted: 1971-03-02
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Expires: 1988-07-15
Abstract
Abstract A control for selectively reversing the direction of rotation of the armature of a permanent magnet type direct current electric motors. The movable contact of a single pole, double throw switch is connected to one terminal of a direct current supply potential source and each stationary contact thereof is connected to a respective opposite side of the motor armature. The current carrying electrodes of respective transistors are connected across opposite sides of the motor armature and the other polarity terminal of the direct current supply potential source. With the movable contact of the switch closed to either stationary contact, the transistor connecting the opposite side of the armature with the other terminal of the direct-current supply potential source is biased conductive to complete an energizing circuit for the motor through the current carrying electrodes thereof.
Inventors
- 👤 Samuel B Robbins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:07
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/03
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
294 words
A reversing control for selectively reversing the direction of rotation of the armature of a permanent magnet type direct current electric motor comprising in combination with a directcurrent supply potential source having positive and negative polarity terminals, a single pole, double throw electric switch having two stationary contacts and a movable contact operable to a first position to engage and establish electrical contact with one of said stationary contacts and to a second position to engage and establish electrical contact with the other one of said stationary contacts, means for connecting said movable contact to a selected one polarity terminal of said direct current supply potential source, first and second transistors each having two current carrying electrodes and a base electrode, means for connecting said current carrying electrodes of said first transistor across one side of said armature and the other polarity terminal of said direct current supply potential source, means for connectiNg said current carrying electrodes of said second transistor across the other side of said armature and the same polarity terminal of said direct-current supply potential source, first and second diodes, means for connecting said first diode between one of said stationary contacts of said electric switch and one side of said motor armature and poled for forward conduction therethrough, means for connecting said second diode between the other one of said stationary contacts and the other side of said armature and poled for forward conduction therethrough, a first transistor bias circuit electrically interconnected with said first transistor for biasing said first transistor conductive when said movable contact engages one said stationary contact and a second transistor bias circuit electrically interconnected with said second transistor for biasing said second transistor conductive when said movable contact engages the other one said stationary contact.
Claim 2
Dependent Claim
294 words
A reversing control for selectively reversing the direction of rotation of the armature of a permanent magnet type direct current electric motor comprising in combination with a directcurrent supply potential source having positive and negative polarity terminals, a single pole, double throw electric switch having two stationary contacts and a movable contact operable to a first position to engage and establish electrical contact with one of said stationary contacts and to a second position to engage and establish electrical contact with the other one of said stationary contacts, means for connecting said movable contact to a selected one polarity terminal of said direct current supply potential source, first and second transistors each having two current carrying electrodes and a base electrode, means for connecting said current carrying electrodes of said first transistor across one side of said armature and the other polarity terminal of said direct current supply potential source, means for connectiNg said current carrying electrodes of said second transistor across the other side of said armature and the same polarity terminal of said direct-current supply potential source, first and second diodes, means for connecting said first diode between one of said stationary contacts of said electric switch and one side of said motor armature and poled for forward conduction therethrough, means for connecting said second diode between the other one of said stationary contacts and the other side of said armature and poled for forward conduction therethrough, a first transistor bias circuit electrically interconnected with said first transistor for biasing said first transistor conductive when said movable contact engages one said stationary contact and a second transistor bias circuit electrically interconnected with said second transistor for biasing said second transistor conductive when said movable contact engages the other one said stationary contact.
Claim 3
Dependent Claim
400 words
A reversing control for selectively reversing the direction of rotation of the armature of a permanent magnet type direct-current electric motor comprising in combination with a direct-current supply potential source having positive and negative polarity terminals, a single-pole, double throw three position electric switch having two stationary contacts and a movable contact operable to a first position to engage and to establish electrical contact with one of said stationary contacts, to a second position to engage and to establish electrical contact with the other one of said stationary contacts and to a third open position, means for connecting said movable contact to a selected one polarity terminal of said direct-current supply potential source, first and second diodes, means for connecting said first diode between one of said stationary contacts of said electric switch and one side of said motor armature and poled for forward conduction therethrough, means for connecting said second diode between the other one of said stationary contacts of said electric switch and the other side of said motor armature and poled for forward conduction therethrough, a first transistor having a base and two current carrying electrodes, first and second resistors, means for connecting said first and second resistors in series across a junction between said second diode and the said stationary contact of said electric switch to which it is connected and the other polarity terminal of said direct current supply potential source, means for connecting said current carrying electrodes of said first transistor across the side of said motor armature to which said second diode is connected and the other polarity terminal of said direct-current supply potential source, means for connecting said base electrode of said first transistor to a junction between said first and second resistors, a second transistor having a base and two current carrying electrodes, third and fourth resistors, means for connecting said third and fourth resistors in series across a junction between said first diode and the said stationary contact of said electric switch to which it is connected and the other polarity terminal of said direct current supply potential source, means for connecting said current carrying electrodes of said second transistor across the other side of said motor armature and the other polarity terminal of said direct current supply potential source and means for connecting said base electrode of said second transistor to a junction between said third and fourth resistors.
Claim 4
Dependent Claim
400 words
A reversing control for selectively reversing the direction of rotation of the armature of a permanent magnet type direct-current electric motor comprising in combination with a direct-current supply potential source having positive and negative polarity terminals, a single-pole, double throw three position electric switch having two stationary contacts and a movable contact operable to a first position to engage and to establish electrical contact with one of said stationary contacts, to a second position to engage and to establish electrical contact with the other one of said stationary contacts and to a third open position, means for connecting said movable contact to a selected one polarity terminal of said direct-current supply potential source, first and second diodes, means for connecting said first diode between one of said stationary contacts of said electric switch and one side of said motor armature and poled for forward conduction therethrough, means for connecting said second diode between the other one of said stationary contacts of said electric switch and the other side of said motor armature and poled for forward conduction therethrough, a first transistor having a base and two current carrying electrodes, first and second resistors, means for connecting said first and second resistors in series across a junction between said second diode and the said stationary contact of said electric switch to which it is connected and the other polarity terminal of said direct current supply potential source, means for connecting said current carrying electrodes of said first transistor across the side of said motor armature to which said second diode is connected and the other polarity terminal of said direct-current supply potential source, means for connecting said base electrode of said first transistor to a junction between said first and second resistors, a second transistor having a base and two current carrying electrodes, third and fourth resistors, means for connecting said third and fourth resistors in series across a junction between said first diode and the said stationary contact of said electric switch to which it is connected and the other polarity terminal of said direct current supply potential source, means for connecting said current carrying electrodes of said second transistor across the other side of said motor armature and the other polarity terminal of said direct current supply potential source and means for connecting said base electrode of said second transistor to a junction between said third and fourth resistors.
Claim 5
Dependent Claim
401 words
A reversing control for selectively reversing the direction of rotation of the armature of a permanent magnet type direct current electric motor comprising in combination with a direct current supply potential source having positive and negative polarity terminals, a single-pole, double throw three position electric switch having two stationary contacts and a movable contact operable to a first position to engage and to establish electrical contact with one of said stationary cOntacts, to a second position to engage and to establish electrical contact with the other one of said stationary contacts and to a third open position, means for connecting said movable contact to a selected one polarity terminal of said direct current supply potential source, first and second diodes, means for connecting said first diode between one of said stationary contacts of said electric switch and one side of said motor armature and poled for forward conduction therethrough, means for connecting said second diode between the other one of said stationary contacts of said electric switch and the other side of said motor armature and poled for forward conduction therethrough, a first transistor having a base and two current carrying electrodes, first and second resistors, means for connecting said first and second resistors in series across a junction between said first diode and the said stationary contact of said electric switch to which it is connected and the other polarity terminal of said direct-current supply potential source, means for connecting said current carrying electrodes of said first transistor across the side of said motor armature to which said second diode is connected and the other polarity terminal of said direct-current supply potential source, means for connecting said base electrode of said first transistor to a junction between said first and second resistors, a second transistor having a base and two current carrying electrodes, third and fourth resistors, means for connecting said third and fourth resistors in series across a junction between said second diode and the said stationary contact of said electric switch to which it is connected and the other polarity terminal of said direct current supply potential source, means for connecting said current carrying electrodes of said second transistor across the other side of said motor armature and the other polarity terminal of said direct-current supply potential source and means for connecting said base electrode of said second transistor to a junction between said third and fourth resistors.
Claim 6
Dependent Claim
401 words
A reversing control for selectively reversing the direction of rotation of the armature of a permanent magnet type direct current electric motor comprising in combination with a direct current supply potential source having positive and negative polarity terminals, a single-pole, double throw three position electric switch having two stationary contacts and a movable contact operable to a first position to engage and to establish electrical contact with one of said stationary cOntacts, to a second position to engage and to establish electrical contact with the other one of said stationary contacts and to a third open position, means for connecting said movable contact to a selected one polarity terminal of said direct current supply potential source, first and second diodes, means for connecting said first diode between one of said stationary contacts of said electric switch and one side of said motor armature and poled for forward conduction therethrough, means for connecting said second diode between the other one of said stationary contacts of said electric switch and the other side of said motor armature and poled for forward conduction therethrough, a first transistor having a base and two current carrying electrodes, first and second resistors, means for connecting said first and second resistors in series across a junction between said first diode and the said stationary contact of said electric switch to which it is connected and the other polarity terminal of said direct-current supply potential source, means for connecting said current carrying electrodes of said first transistor across the side of said motor armature to which said second diode is connected and the other polarity terminal of said direct-current supply potential source, means for connecting said base electrode of said first transistor to a junction between said first and second resistors, a second transistor having a base and two current carrying electrodes, third and fourth resistors, means for connecting said third and fourth resistors in series across a junction between said second diode and the said stationary contact of said electric switch to which it is connected and the other polarity terminal of said direct current supply potential source, means for connecting said current carrying electrodes of said second transistor across the other side of said motor armature and the other polarity terminal of said direct-current supply potential source and means for connecting said base electrode of said second transistor to a junction between said third and fourth resistors.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |