US3594615A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct-current magnet with economizing reed contact
Assignee: Individual
•
Filing: 1970-04-02
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Granted: 1971-07-20
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Expires: 1990-04-02
Abstract
Abstract In a contactor or other movable armature device a direct current magnet with an iron core is employed. Economizing means are provided. For instance, an economizer resistor is connected in series with the magnet winding and a reed switch, subject to magnet flux before the armature has picked up and sealed, is connected to shunt out the economizing resistor or other economizing means until the armature has picked up and sealed.
Inventors
- 👤 John A Cortelli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:53
CPC Classifications
H; H01; H01H; H01H47/00; H01H47/02; H01H47/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
166 words
A magnet comprising: a. a core b. a coil upon the core, whereby magnetic flux passes through the core when the coil is energized, some of which flux follows a divergent flux path c. a movable armature adapted to be attracted to the core having a path of movement such as to weaken such flux when the armature approaches the core d. a reed switch mounted to be responsive to the flux e. economizing means f. said reed switch having normally open contacts connected to the economizing means which close when the flux is relatively strong and open when the flux weakens to eliminate the economizing means, and g. means for energizing said coil with said economizing means applied to said coil, whereby the flux produced when said coil is energized closes the reed switch to eliminate the economizing means and the weakening of the flux as the armature approaches the core permits the reed switch to open and apply the economizing means to the coil.
Claim 2
Dependent Claim
166 words
A magnet comprising: a. a core b. a coil upon the core, whereby magnetic flux passes through the core when the coil is energized, some of which flux follows a divergent flux path c. a movable armature adapted to be attracted to the core having a path of movement such as to weaken such flux when the armature approaches the core d. a reed switch mounted to be responsive to the flux e. economizing means f. said reed switch having normally open contacts connected to the economizing means which close when the flux is relatively strong and open when the flux weakens to eliminate the economizing means, and g. means for energizing said coil with said economizing means applied to said coil, whereby the flux produced when said coil is energized closes the reed switch to eliminate the economizing means and the weakening of the flux as the armature approaches the core permits the reed switch to open and apply the economizing means to the coil.
Claim 3
Dependent Claim
36 words
A magnet as described in claim 1 in which the economizing means comprises a resistor, the reed switch contacts are connected across the economizer resistor and the coil is energized in series with said economizer resistor.
Claim 4
Dependent Claim
31 words
A magnet as described in claim 2 in which a pair of current supply terminals is provided and the economizing resistor is connected to said terminals in series with said coil.
Claim 5
Dependent Claim
55 words
A magnet as described in claim 3 in which the coil is provided with normally closed contacts paralleling the economizing resistor, which open when the armature is moved toward the coil to permit larger initial current flow until the reed switch has been energized to shunt the economizing resistor during initial movement of the armature.
Claim 6
Dependent Claim
55 words
A magnet as described in claim 4 in which a normally open pushbutton switch and a normally closed pushbutton switch are connected in circuit in series with the coil, economizing resistor and the current supply terminals, and normally open holding contacts actuated by the coil are connected in parallel with the normally open pushbutton switch.
Claim 7
Dependent Claim
21 words
A magnet as described in claim 5 in which the current supply terminals are connected to a source of direct current.
Claim 8
Dependent Claim
35 words
A magnet as described in claim 6 wherein a rectifier is provided and alternating current supply terminals are provided with the rectifier interposed between the alternating current supply terminals and the direct current supply terminals.
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) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |