US3579222A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable burglar alarm
Assignee: Individual
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Filing: 1968-01-25
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Granted: 1971-05-18
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Expires: 1988-01-25
Abstract
Abstract The burglar alarm is compact, self-contained and has no significant protrusions, but for a push rod which is pushed in flush with the case when the alarm is supported on its base or when the base is pushed against an object of value. The push rod engages a leaf spring-type switch maintaining it ''''open''''; removal of force from the push rod allows the switch to extend the push rod and close actuating an alarm, for instance a buzzer and a light recessed in the top of the case. This will happen when the burglar alarm is tipped over or the object of value is moved from engagement with the push rod. The foregoing abstract is not intended to be a comprehensive discussion of all of the principles, possible modes or applications of the invention disclosed in this document and should not be used to interpret the scope of the claims which appear at the end of this specification.
Inventors
- 👤 Wilbern Marvin Freeman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:27
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/02; G08B13/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
372 words
A portable burglar alarm having a generally rectangular case including a flat base wall and at least one flat sidewall, the case being characterized by being substantially free of protrusions except for having a switch actuator protruding from said case through means defining an opening in the base wall of said case; at least one electrically powered alarm-giving device mounted on said case; a source of electric power connected in circuit with said at least one alarm-giving device; a normally closed switch interposed in said circuit; said switch actuator having an inner end thereof in operative engagement with said switch; said switch actuator being axially movable in said opening between a retracted condition wherein said actuator maintains said switch in an open condition and an extended condition wherein said switch is in a closed condition; resilient means on said switch engaging said switch actuator and tending to extend said switch actuator sufficiently to close said switch, whereby said switch will remain open only so long as an outside force on said switch actuator maintains said switch actuator in said retracted condition against the tendency of said resilient means to extend said switch actuator; said case being substantially taller than thick; and the weight of said portable burglar alarm, when resting upon said base wall, being sufficient to overcome the tendency of said resilient means to extend said switch actuator so long as said portable burglar alarm rests on said base, and the weight of said portable burglar alarm when resting on said flat sidewall with the switch actuator depressed against an object which may be laterally moved away from the case by a burglar, being sufficient to overcome the tendency of the said resilient means to extend said switch actuator so long as the object is not displaced; said case Having means defining a top wall opposite said base wall, said top wall being upwardly concave; means defining a light reflective surface on the exterior of said top wall; means defining an electric light socket on said case exposed through said top wall centrally of said light reflective surface and connected is said circuit; and electric light bulb mounted in said socket to provide one of said at least one alarm-giving device.
Claim 2
Dependent Claim
372 words
A portable burglar alarm having a generally rectangular case including a flat base wall and at least one flat sidewall, the case being characterized by being substantially free of protrusions except for having a switch actuator protruding from said case through means defining an opening in the base wall of said case; at least one electrically powered alarm-giving device mounted on said case; a source of electric power connected in circuit with said at least one alarm-giving device; a normally closed switch interposed in said circuit; said switch actuator having an inner end thereof in operative engagement with said switch; said switch actuator being axially movable in said opening between a retracted condition wherein said actuator maintains said switch in an open condition and an extended condition wherein said switch is in a closed condition; resilient means on said switch engaging said switch actuator and tending to extend said switch actuator sufficiently to close said switch, whereby said switch will remain open only so long as an outside force on said switch actuator maintains said switch actuator in said retracted condition against the tendency of said resilient means to extend said switch actuator; said case being substantially taller than thick; and the weight of said portable burglar alarm, when resting upon said base wall, being sufficient to overcome the tendency of said resilient means to extend said switch actuator so long as said portable burglar alarm rests on said base, and the weight of said portable burglar alarm when resting on said flat sidewall with the switch actuator depressed against an object which may be laterally moved away from the case by a burglar, being sufficient to overcome the tendency of the said resilient means to extend said switch actuator so long as the object is not displaced; said case Having means defining a top wall opposite said base wall, said top wall being upwardly concave; means defining a light reflective surface on the exterior of said top wall; means defining an electric light socket on said case exposed through said top wall centrally of said light reflective surface and connected is said circuit; and electric light bulb mounted in said socket to provide one of said at least one alarm-giving device.
Claim 3
Dependent Claim
42 words
The portable burglar alarm of claim 1 wherein said concave top wall is recessed so deeply centrally of said reflector that the upper extent of said electric light bulb lies below the upper extent of said case peripherally of said top wall.
Claim 4
Dependent Claim
44 words
The portable burglar alarm of claim 1 wherein said switch comprises a trigger switch having a spring leaf-mounted movable contact, said spring leaf providing said resilient means; and said switch actuator comprising a push rod having an inner end thereof engaging said spring leaf.
Claim 5
Dependent Claim
20 words
The portable burglar alarm of claim 1 wherein said at least one alarm-giving device includes an audible sound generating device.
Claim 6
Dependent Claim
19 words
The portable burglar alarm of claim 1 wherein said source of electric power is wholly contained within said case.
Claim 7
Dependent Claim
25 words
The portable burglar alarm of claim 1 further including a slide-type on-off switch recessed in a sidewall of said case and interposed in said circuit.
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) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |