US4743998A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grounding system
Assignee: Individual
•
Filing: 1986-09-16
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Granted: 1988-05-10
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Expires: 2006-09-16
Abstract
Abstract An improved grounding system comprises a tube which is vertically buried under the ground and cut with a plurality of holes at its lower part, and receives a wire inside it. The wire connects at its top with a set of current leakage detector that alarms a small leakage by a light and turns off power automatically in case of a rather big leakage. The lower end of the wire links with a conductive electrode that is also placed in the tube and is immersed in the underground water so as to be able to release electricity to the ground without keeping any store of potential. Therefore, the electrical appliances including lightening rod conductors equipped with this device can be safely used without producing any shock.
Inventors
- 👤 Cheng-Hsun Wu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:11
CPC Classifications
H; H01; H01R; H01R4/00; H01R4/58; H01R4/66; H02; H02H; H02H3/00; H02H3/16
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
201 words
A ground system comprising: a ground wire; automatic shut-off means; and wire connecting means, said wire connecting means including a case having a bottom with a central hole, a tube having an upper and lower part, said lower part of said tube having a plurality of closely bored holes, said upper part of said tube being connected to said central hole in the bottom of said case, release electrode having a plurality of grids welded around itself, said release electrode being placed inside said tube, connecting wire having first and second ends, said first end linked to said ground wire and said second end connected to said release electrode, a set of leakage detectors for sensing leaking current, cord wire connecting said leakage detectors and said automatic shut-off means, a lid having holes through which said cord wire and said first end of said connecting wire extend outward, said lid covering said case, and fastening means for fastening said lid to said case, said tube being buried under ground which contains ground water, said ground water flowing through said plurality of holes into said tube to contact said release electrode to release current leakage through said release electrode into the water.
Claim 2
Dependent Claim
201 words
A ground system comprising: a ground wire; automatic shut-off means; and wire connecting means, said wire connecting means including a case having a bottom with a central hole, a tube having an upper and lower part, said lower part of said tube having a plurality of closely bored holes, said upper part of said tube being connected to said central hole in the bottom of said case, release electrode having a plurality of grids welded around itself, said release electrode being placed inside said tube, connecting wire having first and second ends, said first end linked to said ground wire and said second end connected to said release electrode, a set of leakage detectors for sensing leaking current, cord wire connecting said leakage detectors and said automatic shut-off means, a lid having holes through which said cord wire and said first end of said connecting wire extend outward, said lid covering said case, and fastening means for fastening said lid to said case, said tube being buried under ground which contains ground water, said ground water flowing through said plurality of holes into said tube to contact said release electrode to release current leakage through said release electrode into the water.
Claim 3
Dependent Claim
43 words
A grounding system as claimed in claim 1, wherein said ground wire is fixed to a metallic ring which is set below an exit conduit, said metallic ring has a projection which is bored with a hole for fixing said grounding wire thereto.
Claim 4
Dependent Claim
37 words
A grounding system as claimed in claim 1, wherein the grids of the electrode can be shaped as a screw with a big surface area so as to contact with water in a large space of area.
Claim 5
Dependent Claim
49 words
A grounding system as claimed in claim 1, wherein the set of current leakage detectors has an inductance coil which is penetrated by a wire and can induce any potential so as to give a leaking alarm or additionally turn off automatically a part or all of the power.
Claim 6
Dependent Claim
184 words
A grounding system as claimed in claim 1, wherein each of said leakage detectors has an induction coil for sensing leaking current and for converting said leakage current into voltage, and wherein said automatic shut-off means receives said voltage from said induction coil, said automatic shut-off means comprises a relay circuit for turning-off power when a resistor in said relay circuit is biased, said automatic shut-off means further comprising first and second circuits, each circuit comprising (a) a current limiting resistor, (b) zener diodes means connected to said current limiting resistor, (c) rectifying means connected to said zener diodes means, and (d) first and second alarm means which produce an alarm when biased by said current limiting resistor, said second circuit being connected to said relay circuit, said first alarm means being activated when a leakage current is detected, and said second alarm means and said relay circuit being activated when said leakage current is high enough to pass through said second circuit, said relay circuit relocating a contact point so that the power, used by the leaking current, is to be automatically cut-off.
Claim 7
Dependent Claim
37 words
A grounding system as claimed in claim 1, wherein the grids of the electrode can be shaped as a ring with a big surface area so as to contact with water in a large space of area.
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) | 1991-05-10 | 1991-11-09 | 1992-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-10 | 1995-11-09 | 1996-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-10 | 1999-11-09 | 2000-05-10 | $7700.00 | Window Closed / Lapsed |