Patent US3718828A successfully refreshed from Google Patents.
US3718828A
Expired / Lapsed
US
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Push button pulse signal generator
Assignee: Guardian Electric Manufacturing Co
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Filing: 1971-08-11
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Granted: 1973-02-27
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Expires: 1991-08-11
Abstract
Abstract A pushbutton signal generator includes a coil mounted in a cylindrical housing with a plunger positioned in the center of the coil. The plunger is held in a fixed position by a permanent magnet within the housing. A push button may be depressed to drive the plunger through the coil thereby generating a pulse signal in the coil when the coil is placed in a circuit.
Inventors
- 👤 L Britton
- 👤 F Vojir
- 👤 W Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:14
CPC Classifications
H; H02; H02K; H02K35/00; H02K35/06; H02K39/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
125 words
A push button signal generator comprising, in combination: a housing having a longitudinal axis and having mounted therein the following: a. a coil with a center opening parallel to the longitudinal axis; b. a plunger of magnetic material including a portion movable in the coil opening, a flange portion outside one end of the coil and a projection extending from said flange portion; c. a magnet adjacent said flange portion for magnetically attracting said flange portion in a first direction; d. a keeper plate for engaging said projection from said plunger to limit the travel of said plunger in said first direction; and e. push button means including an extension for engaging said plunger and driving said plunger in a direction opposite the first direction.
Claim 2
Dependent Claim
125 words
A push button signal generator comprising, in combination: a housing having a longitudinal axis and having mounted therein the following: a. a coil with a center opening parallel to the longitudinal axis; b. a plunger of magnetic material including a portion movable in the coil opening, a flange portion outside one end of the coil and a projection extending from said flange portion; c. a magnet adjacent said flange portion for magnetically attracting said flange portion in a first direction; d. a keeper plate for engaging said projection from said plunger to limit the travel of said plunger in said first direction; and e. push button means including an extension for engaging said plunger and driving said plunger in a direction opposite the first direction.
Claim 3
Dependent Claim
13 words
The signal generator of claim 1 wherein said coil is in a circuit.
Claim 4
Dependent Claim
18 words
The apparatus of claim 1 wherein said keeper plate prevents physical contact of said flange and said magnet.
Claim 5
Dependent Claim
15 words
The apparatus of claim 1 wherein said flange is intermediate said coil and said magnet.
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) | 1976-02-27 | 1976-08-28 | 1977-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-27 | 1980-08-28 | 1981-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-27 | 1984-08-28 | 1985-02-27 | $7700.00 | Window Closed / Lapsed |