US3736503A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple conductor continuity and short circuit testing device
Assignee: GTE Sylvania Inc
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Filing: 1971-10-04
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Granted: 1973-05-29
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Expires: 1991-10-04
Abstract
Abstract An electrical continuity and short circuit testing device adapted for checking pairs of electrical conductors each of which are insulatively oriented from each other. The device utilizes a plurality of transformers each having their primary windings electrically connected to a common power source and each of their secondary windings electrically connected to a pair of current flow indicators. These indicators are in turn each electrically connected to one of said electrical conductors. To provide various combinations for testing, at least one reversing switch is utilized, this switch electrically interconnected between the primary windings of one of the transformers and the common power source.
Inventors
- 👤 K Coleman
- 👤 J Peltz
- 👤 C Stoldt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:36
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/50; G01R31/58; G01R31/52
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
95 words
An electrical continuity and short circuit testing device for simultaneously checking pairs of electrical conductors, each of said conductors insulatively oriented one from another, said device comprising: a common power source; at least two transformers, each of said transformers having their primary windings electrically connected to said common power source and their secondary windings electrically connected to a pair of current flow indicators, each of said current flow indicators electrically connected to one of said electrical conductors; and at least one reversing switch electrically interconnected between one of said transformers and said common power source.
Claim 2
Dependent Claim
95 words
An electrical continuity and short circuit testing device for simultaneously checking pairs of electrical conductors, each of said conductors insulatively oriented one from another, said device comprising: a common power source; at least two transformers, each of said transformers having their primary windings electrically connected to said common power source and their secondary windings electrically connected to a pair of current flow indicators, each of said current flow indicators electrically connected to one of said electrical conductors; and at least one reversing switch electrically interconnected between one of said transformers and said common power source.
Claim 3
Dependent Claim
62 words
The electrical device according to claim 1 wherein said pairs of electrical conductors to be tested number at least three, and said device includes at least three transformers and at least two reversing switches, each of said switches electrically interconnected between one of said transformers and said common power source, one of said transformers thereby being directly connected to said power source.
Claim 4
Dependent Claim
19 words
The electrical device according to claim 1 in which said common power source is a single phase AC source.
Claim 5
Dependent Claim
18 words
The electrical device according to claim 1 wherein each of said current flow indicators comprises an electric lamp.
Claim 6
Dependent Claim
39 words
The electrical device according to claim 1 wherein each of said current flow indicators comprises a sampling resistor connected to a current control device to electrically acTivate an electric lamp in response to electrical current flowing through said resistor.
Claim 7
Dependent Claim
34 words
The electrical device according to claim 5 in which said current control device is a silicon controlled rectifier having a diode electrically connected thereto to prevent reverse current flow through said silicon controlled rectifier.
Claim 8
Dependent Claim
46 words
The device according to claim 6 wherein each of said current flow indicators is electrically connected to a DC source, said DC source providing a continuous DC current to said indicator when said silicon controlled rectifier is activated by electrical current flowing through said sampling resistor.
Claim 9
Dependent Claim
39 words
The device according to claim 7 in which a reset switch is electrically interconnected between said DC source and each of said current flow indicators, thereby providing a means whereby said DC current is terminated from said DC source.
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) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |