US3864581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shock prevention device
Assignee: Individual
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Filing: 1973-01-22
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Granted: 1975-02-04
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Expires: 1993-01-22
Abstract
Abstract A device for disconnecting a load from a power source upon a leakage occurring in said load and which comprises an energizing coil which actuates a first switch to connect the load to the power source and a transistor having a biasing means connected to said load and such that upon leakage in the load, the transistor is biased and thereby deenergizes the coil and the first switch is opened.
Inventors
- 👤 Varahur Srinivas Satyanarayana
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:10
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/16; H02H3/162
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
175 words
A device adapted to disconnect a load from a power source upon a leakage occurring in said load comprising an energizing coil adapted to be connected to a main source, a first switch capable of being closed upon the energization of said coil and thereby connecting a load to the power source, a transistor connected to the energizing coil and having a biasing means, said transistor and biasing means adapted to be connected to said load, such that upon a leakage occurring in the body of the load the transistor is biased and thereby deenergizes said coil and whereby said first switch is opened, and means for preventing a shock to a human body upon contacting a live conductor of the load and which comprises a current transformer connected to said first switch, the secondary of said transformer connected to said transistor through a second biasing means such that said transistor is capable of being biased by said first and/or second biasing means and whereby the coil is deenergized and the first said switch opened.
Claim 2
Independent Claim
175 words
A device adapted to disconnect a load from a power source upon a leakage occurring in said load comprising an energizing coil adapted to be connected to a main source, a first switch capable of being closed upon the energization of said coil and thereby connecting a load to the power source, a transistor connected to the energizing coil and having a biasing means, said transistor and biasing means adapted to be connected to said load, such that upon a leakage occurring in the body of the load the transistor is biased and thereby deenergizes said coil and whereby said first switch is opened, and means for preventing a shock to a human body upon contacting a live conductor of the load and which comprises a current transformer connected to said first switch, the secondary of said transformer connected to said transistor through a second biasing means such that said transistor is capable of being biased by said first and/or second biasing means and whereby the coil is deenergized and the first said switch opened.
Claim 3
Dependent Claim
41 words
A device as claimed in claim 1 comprising a second switch connected between the energizing coil and the phase terminal of said device and whereby upon actuation of the second switch, the coil is energized and said first switch is closed.
Claim 4
Dependent Claim
41 words
A device as claimed in claim 1 wherein said second switch is a push button switch, a third switch provided in parallel to said switch, said third switch being normally closed and connected between the energizing coil and said first switch.
Claim 5
Dependent Claim
29 words
A device as claimed in claim 1 wherein said second biasing means is connected across the secondary of said transformer and consists of a resistor and capacitor in series.
Claim 6
Dependent Claim
18 words
A device as claimed in claim 4 wherein means are provided for short circuiting said resistor and capacitor.
Claim 7
Independent Claim
172 words
A device adapted to disconnect a load from a power source upon a leakage occurring in said load comprising an energizing coil adapted to be connected to a main source, a first switch capable of being closed upon the energization of said coil and thereby connecting a load to the power source, a transistor connected to the energizing coil and having a biasing means, said transistor and biasing means adapted to be connected to said load and such that upon a leakage occurring in the body of the load, the transistor is biased and thereby deenergizes said coil and whereby said first switch is opened, and means for preventing a shock to a human body upon contacting a live conductor of the load and which consists of a first current transformer provided in the phase line, a second current transformer provided in the neutral line, the secondaries of said transformers connected to a balanced amplifier through a sensing means, said balanced amplifier connected to said first transistor through an emitter follower amplifier.
Claim 8
Independent Claim
172 words
A device adapted to disconnect a load from a power source upon a leakage occurring in said load comprising an energizing coil adapted to be connected to a main source, a first switch capable of being closed upon the energization of said coil and thereby connecting a load to the power source, a transistor connected to the energizing coil and having a biasing means, said transistor and biasing means adapted to be connected to said load and such that upon a leakage occurring in the body of the load, the transistor is biased and thereby deenergizes said coil and whereby said first switch is opened, and means for preventing a shock to a human body upon contacting a live conductor of the load and which consists of a first current transformer provided in the phase line, a second current transformer provided in the neutral line, the secondaries of said transformers connected to a balanced amplifier through a sensing means, said balanced amplifier connected to said first transistor through an emitter follower amplifier.
Claim 9
Dependent Claim
20 words
A device as claimed in claim 6 wherein a single sensing means is provided for said firsT and second transformers.
Claim 10
Independent Claim
174 words
A device adapted to disconnect a load from a power source upon a leakage occurring in said load comprising an energizing coil adapted to be connected to a main source, a first switch capable of being closed upon the energization of said coil and thereby connecting a load to the power source, a transistor connected to the energizing coil and having a biasing means, said transistor and biasing means adapted to be connected to said load such that upon a leakage occurring in the body of the load, the transistor is biased and thereby deenergizes said coil and whereby said first switch is opened, and means for preventing a shock to a human body upon contacting a live conductor of the load comprising a first and second current transformer provided in the phase and neutral line respectively, a second transistor connected to the secondaries of said transformers through a second sensing means, said second transistor coupled to said first transistor, such that upon a leakage occurring in the conductor the second transistor is biased.
Claim 11
Independent Claim
174 words
A device adapted to disconnect a load from a power source upon a leakage occurring in said load comprising an energizing coil adapted to be connected to a main source, a first switch capable of being closed upon the energization of said coil and thereby connecting a load to the power source, a transistor connected to the energizing coil and having a biasing means, said transistor and biasing means adapted to be connected to said load such that upon a leakage occurring in the body of the load, the transistor is biased and thereby deenergizes said coil and whereby said first switch is opened, and means for preventing a shock to a human body upon contacting a live conductor of the load comprising a first and second current transformer provided in the phase and neutral line respectively, a second transistor connected to the secondaries of said transformers through a second sensing means, said second transistor coupled to said first transistor, such that upon a leakage occurring in the conductor the second transistor is biased.
Claim 12
Dependent Claim
27 words
A device as claimed in claim 7 wherein the secondary of said first transformer is provided in an opposed relation to the secondary of said second transformer.
Claim 13
Dependent Claim
18 words
A device as claimed in claim 7 wherein single sensing means is provided and consists of a resistor.
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) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |