US3777294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic switch
Assignee: Texas Instruments Inc
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Filing: 1972-11-20
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Granted: 1973-12-04
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Expires: 1992-11-20
Abstract
Abstract An electromagnetic switch having a flux producing solenoid and a movable armature attractable to the solenoid upon the occurrence of a predetermined current level and duration is provided with flux path means in the form of members of low reluctance arranged so that the flux circuit comprises a plurality of loops, each loop having one or more reluctances which are variable and dependent upon the position of a movable core located within the solenoid and the position of the armature. The arrangement is such that increased pulse resistance is obtained without substantially effecting the operation of the switch upon sustained overloads of a predetermined amount and duration.
Inventors
- 👤 A Grenier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:15
CPC Classifications
H; H01; H01H; H01H71/00; H01H71/10; H01H71/12; H01H71/24; H01H71/34; H01H71/345
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
173 words
An electromagnetic switch having improved pulse resistance comprising a flux producing solenoid having first and second ends, a pole piece disposed at the first end of the solenoid, an armature having a clapper portion movable toward and away from the pole piece, a core of magnetic material movably mounted within the solenoid, means forming a flux path having three loops, the flux path forming means including a main frame of magnetic material having a first arm contiguous to the second end of the solenoid, the main frame having a second arm adjacent a portion of the armature, an auxiliary frame of magnetic material having a first leg near the second end of the solenoid but spaced from the first leg of the main frame, the auxiliary frame having a second leg near the first end of the solenoid but spaced from the pole piece, the clapper movable between the pole piece and the second leg of the auxiliary frame, and a member of magnetic material disposed adjacent the pole piece but spaced therefrom.
Claim 2
Dependent Claim
173 words
An electromagnetic switch having improved pulse resistance comprising a flux producing solenoid having first and second ends, a pole piece disposed at the first end of the solenoid, an armature having a clapper portion movable toward and away from the pole piece, a core of magnetic material movably mounted within the solenoid, means forming a flux path having three loops, the flux path forming means including a main frame of magnetic material having a first arm contiguous to the second end of the solenoid, the main frame having a second arm adjacent a portion of the armature, an auxiliary frame of magnetic material having a first leg near the second end of the solenoid but spaced from the first leg of the main frame, the auxiliary frame having a second leg near the first end of the solenoid but spaced from the pole piece, the clapper movable between the pole piece and the second leg of the auxiliary frame, and a member of magnetic material disposed adjacent the pole piece but spaced therefrom.
Claim 3
Dependent Claim
24 words
A switch according to claim 1 in which the member of magnetic material disposed adjacent the pole piece is supported on the auxiliary frame.
Claim 4
Dependent Claim
21 words
A switch according to claim 1 in which the member of magnetic material is common to two of the three loops.
Claim 5
Dependent Claim
77 words
A switch according to claim 1 in which the core is movable between two extremities, in one extremity it extends at least between the first arm of the main frame and the first leg of the auxiliary frame and thus results in relatively low reluctance therebetween while in the other extremity the core does not extend between the first arm of the main bracket and the first leg of the auxiliary bracket resulting relatively high reluctance therebetween.
Claim 6
Dependent Claim
44 words
A switch according to claim 1 in which upon passage of current through the solenoid a magnetic bias is applied from the secone leg of the auxiliary frame to the clapper when the clapper is contiguous to the second leg of the auxiliary frame.
Claim 7
Dependent Claim
40 words
A switch according to claim 5 in which movement of the clapper to the pole piece effectively opens one of the flux loops by creating a relatively high reluctance between the clapper and the second leg of the auxiliary frame.
Claim 8
Dependent Claim
32 words
A switch according to claim 6 in which the movement of the clapper to the pole piece also shunts flux from the second leg of the auxiliary frame through the third frame.
Claim 9
Dependent Claim
22 words
A switch according to claim 1 in which a portion of the member of magnetic material is coplanar with the pole piece.
Claim 10
Dependent Claim
29 words
A switch according to claim 1 in which the member of magnetic material is formed of a plate having a recess therein, the pole piece received in the recess.
Claim 11
Dependent Claim
24 words
A switch according to claim 9 in which the recess is semi-circular and is disposed adjacent the pole piece leaving a radial gap therebetween.
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) | 1976-12-03 | 1977-06-04 | 1977-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-03 | 1981-06-04 | 1981-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-03 | 1985-06-04 | 1985-12-04 | $7700.00 | Window Closed / Lapsed |