US3872471A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulsing bell having rectifier circuit
Assignee: SPX Technologies Inc
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Filing: 1973-05-21
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Granted: 1975-03-18
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Expires: 1993-05-21
Abstract
Abstract A pulsing bell of the type which sounds intermittently so as to provide an emergency alarm indication. The pulsing bell includes an actuator circuit which is incorporated within the bell structure and is extremely simple in design. The actuator circuit is adapted to operate efficiently on a conventional AC power supply.
Inventors
- 👤 Nicholas W F Bird
- 👤 Chang-Whan Kim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:08
CPC Classifications
G; G08; G08B; G08B3/00; G08B3/10; G10; G10K; G10K1/00; G10K1/06; G10K1/062; G10K1/063; G10K1/064; G10K1/065
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
100 words
A unitary alarm indicating device adapted to be intermittently operated from an AC power supply, comprising: a. an actuator device including a housing therefore, b. an actuator circuit enclosed within said actuator housing, said actuator circuit including, 1. a control device having an anode, cathode and gate, 2. an electronic triggering circuit for producing a series of square wave pulses for effectuating intermittent operation of said actuator, said triggering circuit having its output connected to the gate of said control device, and 3. a rectifier circuit connecting said AC power supply to the anode and cathode of said control device.
Claim 2
Dependent Claim
100 words
A unitary alarm indicating device adapted to be intermittently operated from an AC power supply, comprising: a. an actuator device including a housing therefore, b. an actuator circuit enclosed within said actuator housing, said actuator circuit including, 1. a control device having an anode, cathode and gate, 2. an electronic triggering circuit for producing a series of square wave pulses for effectuating intermittent operation of said actuator, said triggering circuit having its output connected to the gate of said control device, and 3. a rectifier circuit connecting said AC power supply to the anode and cathode of said control device.
Claim 3
Dependent Claim
34 words
an electronic triggering circuit for producing a series of square wave pulses for effectuating intermittent operation of said actuator, said triggering circuit having its output connected to the gate of said control device, and
Claim 4
Dependent Claim
34 words
an electronic triggering circuit for producing a series of square wave pulses for effectuating intermittent operation of said actuator, said triggering circuit having its output connected to the gate of said control device, and
Claim 5
Dependent Claim
17 words
A device as defined in claim 1, in which said control device is a silicon controlled rectifier.
Claim 6
Dependent Claim
44 words
An alarm device as defined in claim 2 in which said rectifier is a full wave bridge rectifier, said silicon controlled rectifier being connected between two opposed corners of said bridge, the power supply being connected to the remaining opposed corners of said bridge.
Claim 7
Dependent Claim
17 words
a rectifier circuit connecting said AC power supply to the anode and cathode of said control device.
Claim 8
Dependent Claim
17 words
a rectifier circuit connecting said AC power supply to the anode and cathode of said control device.
Claim 9
Dependent Claim
71 words
An alarm device or system as defined in claim 2 in which said triggering circuit includes an astable multivibrator and a driver stage connected to the output of the multivibrator, said driver stage consisting of a single transistor; a first voltage divider connected to the output of said transistor, the gate electrode of said silicon controlled rectifier being connected to the junction of the pair of resistors defining said voltage divider.
Claim 10
Dependent Claim
43 words
A device as defined in claim 2 in which said triggering circuit has its output connected to the gate electrode of said silicon controlled rectifier device, and including a reference line for said triggering circuit connected to the cathode of said SCR device.
Claim 11
Dependent Claim
29 words
A device as defined in claim 1, further including a second rectifier device connected to the AC power supply so as to furnish DC power to said triggering circuit.
Claim 12
Dependent Claim
35 words
A device as defined in claim 4, further comprising a second voltage divider, a second rectifier device, and a third diode connected to the junction between a pair of resistors defining said second voltage divider.
Claim 13
Dependent Claim
50 words
A device as defined in claim 4 in which said astable multivibrator includes cross coupled transistors, the emitter circuit of each of which includes a fourth and a fifth diode, and a sixth diode connected between the output of said astable multivibrator and the driver stage for sAid triggering circuit.
References Cited (Backward Citations)
US3460136A
Cited
US3618079A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |