US3715502A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alarm coupler
Assignee: Robertshaw Controls Co
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Filing: 1971-03-03
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Granted: 1973-02-06
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Expires: 1991-03-03
Abstract
Abstract A solid-state coupler for transferring a telephone line from conventional house phones to automatic dialing apparatus upon the occurrence of an alarm includes a main transfer relay, a dialing relay adapted to be controlled by the automatic dialing apparatus, a start hang-up timer for opening the telephone line for a preselected hang-up interval upon actuation of the main transfer relay, a dial pulse reconstitution network, and a release delay timer for holding the main transfer relay energized for a preselected release time upon termination of the alarm sequence. Solid-state timing networks of the coupler provide line clearance and total exclusion of house phones for priority handling of all emergency calls.
Inventors
- 👤 S Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:43
CPC Classifications
H; H04; H04M; H04M11/00; H04M11/04; H04M11/045
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
202 words
An alarm coupler for selectively interfacing automatic dialing alarm means and a conventional house telephone with a telephone line, comprising: a set of alarm pulsing contacts adapted to be actuated by said alarm means to generate pulses; dialing means responsively connected with said set of alarm pulsing contacts and adapted to seize a telephone line and transmit over said line uniform dialing pulse signals reconstituted from said alarm pulse contact pulses; transfer switching means responsively connected with said alarm pulsing contacts and adapted to be connected with said telephone line and a conventional house phone, said transfer switching means having a first state providing a connection between the telephone line and the house phone and a second state providing a connection between the telephone line and said dialing means; and release timing means connected between said set of alarm pulsing contacts and said transfer switching means for actuating and thereafter maintaining said transfer switching means in said second state upon closure of said alarm pulsing contacts and for releasIng said transfer switching means to said first state in response to the opening of said set of alarm pulsing contacts for a predetermined interval greater than that required to release the telephone line.
Claim 2
Dependent Claim
202 words
An alarm coupler for selectively interfacing automatic dialing alarm means and a conventional house telephone with a telephone line, comprising: a set of alarm pulsing contacts adapted to be actuated by said alarm means to generate pulses; dialing means responsively connected with said set of alarm pulsing contacts and adapted to seize a telephone line and transmit over said line uniform dialing pulse signals reconstituted from said alarm pulse contact pulses; transfer switching means responsively connected with said alarm pulsing contacts and adapted to be connected with said telephone line and a conventional house phone, said transfer switching means having a first state providing a connection between the telephone line and the house phone and a second state providing a connection between the telephone line and said dialing means; and release timing means connected between said set of alarm pulsing contacts and said transfer switching means for actuating and thereafter maintaining said transfer switching means in said second state upon closure of said alarm pulsing contacts and for releasIng said transfer switching means to said first state in response to the opening of said set of alarm pulsing contacts for a predetermined interval greater than that required to release the telephone line.
Claim 3
Dependent Claim
202 words
An alarm coupler for selectively interfacing automatic dialing alarm means and a conventional house telephone with a telephone line, comprising: a set of alarm pulsing contacts adapted to be actuated by said alarm means to generate pulses; dialing means responsively connected with said set of alarm pulsing contacts and adapted to seize a telephone line and transmit over said line uniform dialing pulse signals reconstituted from said alarm pulse contact pulses; transfer switching means responsively connected with said alarm pulsing contacts and adapted to be connected with said telephone line and a conventional house phone, said transfer switching means having a first state providing a connection between the telephone line and the house phone and a second state providing a connection between the telephone line and said dialing means; and release timing means connected between said set of alarm pulsing contacts and said transfer switching means for actuating and thereafter maintaining said transfer switching means in said second state upon closure of said alarm pulsing contacts and for releasIng said transfer switching means to said first state in response to the opening of said set of alarm pulsing contacts for a predetermined interval greater than that required to release the telephone line.
Claim 4
Dependent Claim
202 words
An alarm coupler for selectively interfacing automatic dialing alarm means and a conventional house telephone with a telephone line, comprising: a set of alarm pulsing contacts adapted to be actuated by said alarm means to generate pulses; dialing means responsively connected with said set of alarm pulsing contacts and adapted to seize a telephone line and transmit over said line uniform dialing pulse signals reconstituted from said alarm pulse contact pulses; transfer switching means responsively connected with said alarm pulsing contacts and adapted to be connected with said telephone line and a conventional house phone, said transfer switching means having a first state providing a connection between the telephone line and the house phone and a second state providing a connection between the telephone line and said dialing means; and release timing means connected between said set of alarm pulsing contacts and said transfer switching means for actuating and thereafter maintaining said transfer switching means in said second state upon closure of said alarm pulsing contacts and for releasIng said transfer switching means to said first state in response to the opening of said set of alarm pulsing contacts for a predetermined interval greater than that required to release the telephone line.
Claim 5
Dependent Claim
51 words
The invention as recited in claim 1 wherein said dialing means includes hang-up delay means for presenting an open circuit to the telephone line for a delay interval sufficient to release the telephone line upon actuation of said alarm pulsing contacts, said release delay interval being less than said predetermined interval.
Claim 6
Dependent Claim
43 words
The invention as recited in claim 2 wherein said hang-up delay means includes controlled-switch means having first and second operative states and delay timing means connected to actuate said controlled-switch means to said second operative state after said hang-up delay interval has elapsed.
Claim 7
Dependent Claim
51 words
The invention as recited in claim 3 wherein said controlled switch means includes a silicon controlled rectifier, and wherein said delay timing means includes a unijunction transistor having one base connected to gate electrode of said silicon controlled rectifier and a storage capacitor connected to the emitter electrode of said transistor.
Claim 8
Dependent Claim
55 words
The invention as recited in claim 3 further including circuit means connected to said controlled-switch means and said alarm pulsing contacts and adapted to place said controlled-switch means in said first operative state whenever said alarm pulsing contacts are maintained open for at least a preselected interval greater than the period of a dialing pulse.
Claim 9
Dependent Claim
40 words
The invention as recited in claim 5 wherein said circuit means includes a unijunction transistor having one base connected to the gate electrode of said controlled-switch means and a storage capacitor connected to the emitter electrode of said unijunction transistor.
Claim 10
Dependent Claim
38 words
The invention as recited in claim 6 wherein said circuit means further includes an inhibiting transistor connected across said storage capacitor and responsive to closure of said alarm pulsing contacts to inhibit the charging of said storage capacitor.
Claim 11
Dependent Claim
104 words
The invention as recited in claim 1 wherein said release timing means includes switch means connected to said transfer switching means and having first and second operative conditions, said transfer switching means assuming said first state in response to said switch means assuming said first condition and said transfer switching means assuming said second state in response to said switch means assuming said second condition, and said release timing means further includes coupling means connected to said alarm pulsing contacts and said switch means and adapted to place said switch means in said second condition in response to closure of said alarm pulsing contacts.
Claim 12
Dependent Claim
16 words
The invention as recited in claim 8 wherein said switch means comprises a silicon controlled rectifier.
Claim 13
Dependent Claim
44 words
The invention as recited in claim 8 wherein said release timing means further includes circuit means connected to said switch means and adapted to place said switch means in said first condition after a predetermined delay interval from opening of said alarm pulsing contacts.
Claim 14
Dependent Claim
40 words
The invention as recited in claim 10 wherein said release timing means further includes means connected to said circuit means and said alarm pulsing contacts for inhibiting the operation of said circuit means whenever said alarm pulsing contacts are closed.
Claim 15
Dependent Claim
54 words
The invention as recited in claim 11 wherein said circuit means includes a unijunction transistor having one base connected to the gate electrode of said silicon controlled rectifier and a capacitor connected to the emitter electrode of said unijunction transistor, and wherein said inhibit means comprises a transistor connected in shunt with said capacitor.
Claim 16
Dependent Claim
32 words
The invention as recited in claim 1 wherein said dialing means includes pulse reconstitution means responsive to momentary opening of said alarm pulsing contacts for transmitting dialing pulses having uniform pulse width.
Claim 17
Dependent Claim
45 words
The invention as recited in claim 13 wherein said pulse reconstitution means includes monostable means responsive to momentary opening of said alarm pulsing contacts to assume an unstable state for a preselected interval independent of the duration of the opening of said alarm pulsing contacts.
Claim 18
Dependent Claim
46 words
The invention as recited in claim 14 wherein said monostable means includes controlled-switch means assuming a triggered state in response to momentary opening of said alarm pulsing contacts and extinguishing means connected to said controlled-switch means for extinguishing the same after said preselected interval has elapsed.
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) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |