US3566146A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Burglar deterrent
Assignee: DYNA MECH SCIENCES Inc
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Filing: 1969-02-19
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Granted: 1971-02-23
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Expires: 1989-02-19
Abstract
Abstract A shocker circuit is provided comprising a timing circuit arranged to periodically energize the primary of a transformer from a relatively low voltage rechargeable DC supply. The secondary of the transformer is connected to potential entry locations of a building to be protected, or to other ungrounded metallic objects, and operates to apply high voltage low current pulses thereto. A switching circuit selectively connects a recharging source, energized from a higher voltage main power supply, to the DC supply for charging purposes, said switching circuit being so arranged that the main power supply is never applied to the shocker circuit and any attempt to disable the recharging circuit assures that the shocker circuit is fully operative.
Inventors
- 👤 Howard J Breeze
- 👤 Harry D Lortz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:14
CPC Classifications
H; H05; H05C; H05C1/00; H05C1/02; G; G08; G08B; G08B15/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
274 words
A burglar deterrent comprising a relatively low voltage rechargeable battery energization source, a shocker circuit comprising a timing circuit and an output transformer having primary and secondary windings, switching means for connecting said battery source to said shocker circuit for causing said transformer primary winding to be intermittently energized at a rate determined by said timing circuit, whereby relatively high voltage relatively low current pulses are induced in the secondary winding of said transformer for use as a burglar deterrent, a relatively high voltage main power source coupled to said switching means, manually operated control means for controlling the operating state of said switching means to selectively disconnect said battery source from said shocker circuit and simultaneously to couple said battery source to said main power source thereby to deactivate said shocker circuit and simultaneously to complete a charging circuit between said main power source and said rechargable battery source, said timing circuit including a relay having an operating coil and movable contact means, capacitor means connected across said operating coil, charging circuit means including said movable contact means for selectively charging said capacitor means from said battery source to control the energization of said relay operating coil, further circuit means including said movable contact means for selectively connecting said battery source to, and disconnecting said battery source from, the primary winding of said output transformer in dependence upon the state of energization of said relay operating coil, and discharging circuit means comprising said movable contact means for completing a discharge path for said capacitor separate from said charging circuit when said battery source is connected to the primary winding of said output transformer.
Claim 2
Dependent Claim
274 words
A burglar deterrent comprising a relatively low voltage rechargeable battery energization source, a shocker circuit comprising a timing circuit and an output transformer having primary and secondary windings, switching means for connecting said battery source to said shocker circuit for causing said transformer primary winding to be intermittently energized at a rate determined by said timing circuit, whereby relatively high voltage relatively low current pulses are induced in the secondary winding of said transformer for use as a burglar deterrent, a relatively high voltage main power source coupled to said switching means, manually operated control means for controlling the operating state of said switching means to selectively disconnect said battery source from said shocker circuit and simultaneously to couple said battery source to said main power source thereby to deactivate said shocker circuit and simultaneously to complete a charging circuit between said main power source and said rechargable battery source, said timing circuit including a relay having an operating coil and movable contact means, capacitor means connected across said operating coil, charging circuit means including said movable contact means for selectively charging said capacitor means from said battery source to control the energization of said relay operating coil, further circuit means including said movable contact means for selectively connecting said battery source to, and disconnecting said battery source from, the primary winding of said output transformer in dependence upon the state of energization of said relay operating coil, and discharging circuit means comprising said movable contact means for completing a discharge path for said capacitor separate from said charging circuit when said battery source is connected to the primary winding of said output transformer.
Claim 3
Dependent Claim
85 words
The combination of claim 1 wherein said main power source comprises a voltage source and a further transformer having primary and secondary windings, said switching means including first means for selectively connecting said voltage source to the primary winding of said further transformer only when said battery source is disconnected from said shocker circuit, and said switching means including second means for coupling the secondary winding of said further transformer to said battery source only when said battery source is disconnected from said shocker circuit.
Claim 4
Dependent Claim
81 words
The combination of claim 1 wherein said switching circuit comprises an electrical circuit connected to said battery source, said manually operated control means being connected to both said electrical circuit and to said battery source, whereby said electrical circuit is energized selectively from said battery source in dependence upon tHe operating state of said control means, said switching circuit including means operative to connect said battery source to said shocker circuit only when said electrical circuit is in its deenergized state.
Claim 5
Dependent Claim
51 words
The combination of claim 3 wherein said switching circuit comprises a relay, said electrical circuit comprising the coil of said relay, said manually operated control means comprising a switch, the coil of said relay and said switch being connected in series with one another across the terminals of said battery source.
Claim 6
Dependent Claim
80 words
The combination of claim 4 wherein said relay includes a pair of simultaneously operable single pole double throw contacts positionally controlled by the state of energization of said coil, and circuit means including said pair of contacts for connecting said main power source only to said battery source when said switch is closed and said relay coil is energized, and for connecting said battery source to said shocker circuit when said switch is open and said relay coil is deenergized.
Claim 7
Dependent Claim
39 words
The combination of claim 1 wherein said charging circuit means and said discharging circuit means include separate resistive means connected alternatively to said capacitor means for respectively determining the RC charge and discharge time constants of said timing circuit.
Claim 8
Dependent Claim
32 words
The combination of claim 1 wherein the secondary winding of said output transformer includes a grounded center tap, the opposing ends of said secondary winding being connected to different output circuits respectively.
Claim 9
Dependent Claim
38 words
The combination of claim 1 including arc suppression means in said further circuit means between said movable contact means and the primary of said transformer, said arc suppression means comprising diode means in series with said transformer primary.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |