Patent US3712581A successfully refreshed from Google Patents.
US3712581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solenoid combined shading coil and return spring
Assignee: Emerson Electric Co
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Filing: 1970-11-02
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Granted: 1973-01-23
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Expires: 1990-11-02
Abstract
Abstract An a.c. solenoid valve having a magnetic plunger member carrying a valve at one end and a magnetic stop member engaged by the other end of the plunger member when the solenoid is energized to open the valve, the device further including a helical spring of beryllium copper positioned between these members and entered partially into an annular groove in the surface of one of the members, whereby the spring provides conductive turns around a portion of one of the members defined by the groove, thereby to provide a shaded pole portion, and whereby the spring has sufficient resiliency to return the valve to a biased closed position when the solenoid is de-energized.
Inventors
- 👤 J Parlow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:41
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/02; F16K31/06; F16K31/0644; F16K31/0655; F16K31/0658; H; H01; H01F; H01F7/00; H01F7/06; H01F7/08; H01F7/10; H01F7/12; H01F7/1205
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
182 words
In an a.c. solenoid valve, a winding, a magnetic plunger member and a magnetic stop member having meeting end faces at one end, an annular groove in the meeting end face of one of said members, a helical return spring formed of beryllium-copper alloy wire having one end portion thereof entered into said groove and bearing at its other end against the end face of the other of said members, a valve body having a seat formed therein, a valve at the other end of said plunger member cooperating with said valve seat, said groove having sufficient depth to receive said entire spring therein and said spring having sufficient resiliency to be compressed therein when said winding is energized to open said valve, the ratio of inductive reactance to resistance of said spring being such as to eliminate objectionable chattering due to current reversals of an a.c. operating power supply by substantially shifting the phase of that portion of the flux passing therethrough, and said spring constituting the sole shading means operative to substantially eliminate chattering of said plunger against said stop.
Claim 2
Dependent Claim
182 words
In an a.c. solenoid valve, a winding, a magnetic plunger member and a magnetic stop member having meeting end faces at one end, an annular groove in the meeting end face of one of said members, a helical return spring formed of beryllium-copper alloy wire having one end portion thereof entered into said groove and bearing at its other end against the end face of the other of said members, a valve body having a seat formed therein, a valve at the other end of said plunger member cooperating with said valve seat, said groove having sufficient depth to receive said entire spring therein and said spring having sufficient resiliency to be compressed therein when said winding is energized to open said valve, the ratio of inductive reactance to resistance of said spring being such as to eliminate objectionable chattering due to current reversals of an a.c. operating power supply by substantially shifting the phase of that portion of the flux passing therethrough, and said spring constituting the sole shading means operative to substantially eliminate chattering of said plunger against said stop.
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) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |