|Publication number||USRE42331 E1|
|Application number||US 12/714,245|
|Publication date||May 10, 2011|
|Filing date||Feb 26, 2010|
|Priority date||Jun 1, 2007|
|Also published as||US7462776|
|Publication number||12714245, 714245, US RE42331 E1, US RE42331E1, US-E1-RE42331, USRE42331 E1, USRE42331E1|
|Inventors||Roy B. Carpenter, Jr., Nathan M. Mascarenas, Darwin N. Sletten|
|Original Assignee||Lightning Eliminators & Consultants, Inc.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (41), Non-Patent Citations (2), Classifications (13), Legal Events (2)|
|External Links: USPTO, USPTO Assignment, Espacenet|
The present invention relates to chemically activated grounding electrodes that provide a low resistance connection to earth.
U.S. Pat. No. 6,515,220 B1 (2003) to Carpenter, Jr. discloses a chemically activated grounding electrode constructed from a copper cylinder, a copper upper collar and a copper screw on cap. The copper cylinder has a lug onto which a grounding cable may be exothermically welded. During manufacturing the upper collar is exothermically welded to the cylinder, and the lug is welded to the cylinder.
An osmotic conductor is poured into the cylinder, and then the electrode is buried in the earth with the cap accessible at or above the earth's surface. The threads for the cap are traditional 360° threads. In the field the traditional 360° threads become galvanically corroded. When this happens, the osmotic conductor inside the cylinder cannot be checked or replaced. Copper was found to deteriorate over time, and some applications required zinc or tin coatings on the copper cylinder. When this is done, corrosion from dissimilar metals occurs at joints. The end user could not bolt on a grounding cable of his own choice since the exothermic welded grounding cable was shipped with the grounding electrode.
What is needed is a corrosion resistant construction for the cylinder, a single mold construction for the collar and the attachment lug, a one metal construction to avoid corrosion at joints, a non-corroding cap attachment means, and a multi-purpose lug connector for the grounding wire.
The present invention is made of all stainless steel construction. A multi-purpose connector provides for either an exothermic weld connection and/or a wire through stud connection using a bolt to the grounding wire. The cap has a pair of thick ramp type threads which lock with a 90° turn of the cap. Thus, a longer life grounding electrode is provided that can perform in all soil conditions without a costly coating procedure for the cylinder.
An aspect of the present invention is to provide a corrosion resistant cap for a ground electrode, said cap having a 90° corrosion resistant thread.
Another aspect of the present invention is to provide a multi-purpose connector for a grounding wire affixed to the grounding electrode.
Another aspect of the present invention is to provide an all stainless steel construction.
Another aspect of the present invention is to provide a single mold construction for the collar and the attachment lug.
Other aspects of this invention will appear from the following description and appended claims, reference being made to the accompanying drawings forming a part of this specification wherein like reference characters designate corresponding parts in the several views.
The present invention uses a stainless steel tube with a bottom. On the upper part of the tube is placed a collar cast from stainless steel. The collar has two female thread segments that run one quarter turn on the outside of the collar. The cap has two male one quarter turn twin threads that mate with the collar's threads. A large bolt head is located on the top of the cap to enable a large wrench to open the cap.
The collar has a multi-purpose lug that includes a stud for an exothermic weld connection and a plate with a bolt hole for a wire to lug connection.
Before explaining the disclosed embodiment of the present invention in detail, it is to be understood that the invention is not limited in its application to the details of the particular arrangement shown, since the invention is capable of other embodiments. Also, the terminology used herein is for the purpose of description and not of limitation.
Referring first to
A lug 6 projects from the tube 2. It is a part of an exothermic weld for the end cap 7 of the grounding cable 8. The lug 6 is welded to the tube 2 during manufacturing. The grounding cable 8 is generally welded to the lug 6 in the factory or in the field.
The cap 40 is stainless steel. It has a top shelf 41 which has a square bolt head 42 for a wrench. Male thread 43 is about ½″ thick at the start of its taper, and 3/16″ thick at the end of its taper. It fits into recess 28, and thread 44 fits into recess 27. A quarter turn (90°) clockwise will lock the cap 40 to the collar 24.
The collar 24 has a lug 50 for an exothermic weld connection to a grounding cable 8 using end cap 7 as seen in
Referring next to
Referring next to
Referring next to
Referring next to
Although the present invention has been described with reference to preferred embodiments, numerous modifications and variations can be made and still the result will come within the scope of the invention. No limitation with respect to the specific embodiments disclosed herein is intended or should be inferred. Each apparatus embodiment described herein has numerous equivalents.
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|1||Notice of Allowance mailed Aug. 14, 2008 from U.S. Appl. No. 11/757,201.|
|2||Office Action mailed Jun. 16, 2008 from U.S. Appl. No. 11/757,201.|
|U.S. Classification||174/51, 439/92, 174/6, 174/7, 361/753, 174/40.0CC|
|Cooperative Classification||H01R4/029, H01R4/30, H01R4/66, H01R3/08|
|European Classification||H01R4/66, H01R3/08|
|Jul 23, 2012||REMI||Maintenance fee reminder mailed|
|Dec 9, 2012||LAPS||Lapse for failure to pay maintenance fees|