US3548069A - Helical earth - Google Patents

Helical earth Download PDF

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Publication number
US3548069A
US3548069A US816341A US3548069DA US3548069A US 3548069 A US3548069 A US 3548069A US 816341 A US816341 A US 816341A US 3548069D A US3548069D A US 3548069DA US 3548069 A US3548069 A US 3548069A
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US
United States
Prior art keywords
earth
rod
main body
driving
driving rod
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US816341A
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English (en)
Inventor
Hikoitsu Watanabe
Sanji Genma
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SANJI GENMA
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Individual
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Filing date
Publication date
Priority claimed from JP8324368A external-priority patent/JPS5111299B1/ja
Priority claimed from JP9649368A external-priority patent/JPS516345B1/ja
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of US3548069A publication Critical patent/US3548069A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G13/00—Installations of lightning conductors; Fastening thereof to supporting structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
    • H01R4/66—Connections with the terrestrial mass, e.g. earth plate, earth pin
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G13/00—Installations of lightning conductors; Fastening thereof to supporting structure
    • H02G13/40—Connection to earth
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G13/00—Installations of lightning conductors; Fastening thereof to supporting structure
    • H02G13/80—Discharge by conduction or dissipation, e.g. rods, arresters, spark gaps

Definitions

  • Askin Attorney-Jocies and Greenside ABSTRACT A suitable length of an electrically conductive metallic strip, bar or wire is wound into a helical earth having an engaging member formed at the lower end thereof for engagement with a driving rod for driving said earth into the ground.
  • the driving force is applied to the upper end of the driving rod so as to drive into the ground the driving rod together with the earth and after having driven into a predetermined depth of setting, the driving rod is pulled out.
  • the present invention relates to an earth for safeguarding an electrical apparatus and equipment and for preventing electrolytic corrosion of underground steel pipes or the like.
  • the earth Generally it is preferable to set the earth to a depth at which the soil conditions such as moisture thereof can be maintained constant without being influenced by the dry or wet condition of the surface soil.
  • Widely used is an electrically earthing or grounding method in which a plurality of earth rods in the form of a bar or pipe made of an electrically conductive metal are driven underground one by one and connected with one with another so that the whole earth rod assembly may reach a considerably deep depth of setting.
  • socket joints are required forjoining the earth rods and the diameter of the socket joint is inevitably larger than the outer diameter of earth rod so that when the earth rod is driven underground the socket joint enlarges the earth hole larger than the earth rod. Therefore, the earth rod is driven into the hole whose diameter is larger than that of the earth rod so that the earth rod cannot closely contact with the surrounding soil, resulting in poor or ineffective electrical earthing or grounding.
  • an electrically conductive solution is poured into or around the earth so as to form a better electrically conductive soil layer around the earth thereby reducing electrical resistance between the earth and its surrounding soil.
  • the primary object of the present invention is therefore to provide a novel earth which can completely eliminate the above-described defects encountered in the conventional earth.
  • the present invention is characterized in that a length of an electrically conductive strip, baror wire is wound in a form of a helix having a uniform diameter or in a form of a flat spiral, the lower end of said earth having an engaging member which is adapted to engage with the leading end of a driving rod for driving underground the earth;'and after theearth has been driven underground together with the driving rod, only the latter is pulled out from the ground so that the earth may be retained to set to a predetermined depth of setting. Because of the construction of the earth of the present invention, the driving operation and the fabrication of the earth is much facilitated.
  • pitches of the helically wound earth may serve as spaces for passing water therethrough so that an electrically conductive solution poured into the earth from the upper open end thereof may filtrate into the soil surrounding the earth, thereby forming an electrically conductive soil layer therearound.
  • FIG. 1 is a front view of one embodiment of a helical earth according to the present invention
  • FIG. 2 is a top view thereof
  • FIG. 3 is a front view of one modification of the helical earth of FIG. 1;
  • FIG. 4 is a top view thereof
  • FIG. 5 is another embodiment of the present invention in which the earth is wound into flat spiral form instead of being wound into a helical shape as shown in FIG. 1;
  • FIG. 6 is a top view thereof
  • FIG. 7 is a front view of still another embodiment of the present invention similar in the form to that of FIG. 5;
  • FIG. 8 is a top view thereof
  • FIG. 9 is a side view of one embodiment of a driving rod
  • FIG. 10 is a side view of another embodiment of a driving rod; and 4 FIGS. 11 to 14 are side views for explanation of the earth driving. 7
  • FIG. 1 an earth 20 of the present invention comprising a main body 22 consisting of a helically wound elongated plate or strip, a lead wire 24 attached to the uppermost end of the main body 22 and an engaging portion 26 formed at the lowermost portion thereof.
  • the helically wound main body 22 is made of an elongated plate or strip having suitable length and width and a good electrical conductivity.
  • the strip is wound in the helical form having the same outer diameter throughout the whole length thereof with a suitable pitch for providing spaces 28 between the adjacent turns which serve as waterdraining grooves.
  • the lead wire 24 At the upper end of the helically wound main body 22 is fixed the lead wire 24 by for example brazing in order to flow the current to the main body 22.
  • the lower end of the main body 22 is bent radially inwardly as best shown in FIG. 2, thereby forming the engaging portion 26 which has a pawl element 30 securely fixed thereto.
  • a wire is used for forming thehelical main body 22a of the earth 20a.
  • the wire is wound up helically and the lower end thereof is slightly radially inwardly bent and has the engaging member 26a in the form of a cylinder fixed thereto by for example brazing.
  • Other constructions are similar to those of the embodiment shown in FIGS. 1 and 2 in that the pitches or spaces 28a are formed between the adjacent turns so as to serve as a water draining groove and thelead wire 24a is fixed to the upper end of the helical main body 22a by for example brazing.
  • the third embodiment of the present invention shown in FIGS. 5 and 6 is similar in construction and material to the earth shown in FIGS. 1 and 2. That is, the main body 22b is made of an electrically conductive metallic strip having suitable length and width, but in the third embodiment the strip is wound up in the flat spiral form. Therefore, when the inner and outer ends of this main body 22b are vertically pulled in the opposite directions the main body 22b is then extended into the helical form as in the case of the embodiment shown in FIGS. 1 and 2.
  • a fourth embodiment of the present invention shown in FIGS. 7 and 8 is similar to that shown in FIGS. and 6 with the exception that the main body 22c of this earth 20c consists of a spirally wound wire made of a good electrically conductive metal and at the inner end thereof which becomes the lower end when extended is attached the cylindrical engaging member 260 by brazing or the like.
  • the lead wire 24c is attached to the outer end of the main body which becomes the upper end thereof when extended, by brazing or the like.
  • FIGS. 9 and 10 illustrate thedriving rods respectively for driving into the ground the earths to 200 having the constructions as described with reference to-FIGS. l to 8.
  • the 'driving rod 40 shown in FIG. 9 is especially adapted to drive the earths 20 and 20b shown in FIGS. 1 and 2; and 5 and 6 into the ground.
  • the driving rod 40 comprises a rod portion 42 whose diameter is slightly smaller than the outer diameters of the earths 20 and 20b, a head 44 formed at the upper end of the rod portion 42 and a conical driving shoe 46 formed at'the lower end of the rod portion 42.
  • the conical driving shoe 46 is provided with a groove 48 into which is fitted the engaging portions or members 26 or 26b of the earth 20 or 20b.
  • the driving rod 50 shown in FIG. 10 is adapted to drive into the ground the earths 20a and 20c shown in FIGS. 3 and 4; 7 and 8 respectively, and comprises rod portion 52 having an outer diameter slightly smaller than those of the earths 20a and 200, a head 54 formed at the top of the rod portion 52, a reduced diameter portion 58 which is adapted to fit into the cylindrical engaging member 26a or 26c of the earth 20a or 20c and a conical and sharp-pointed driving shoe 56 formed at the leading end of the reduced diameter portion 58.
  • the rod portion 42 or 52 may consist of for example three rods 42a, 42b and 42c or 52a, 52b and 520.
  • the lowermost rod 42a or 52a is provided with the above-described conical driving shoe 46 having the groove 48 formed therein or with the reduced portion 58 having the driving shoe 56 formed at the lower end thereof,.
  • these individual rods 42;, 42b and 420 or 52a, 52b and 520 are detachably connected with one another in unitary construction by means of screw threads 60 or 62.
  • the head 44 or 54 may be selectively and detachably connected to one of the upper ends of the rods 42a, 42b and 42c of 52a, 52b and 52c by screw threads 60 or 62.
  • the driving rod 40 or 50 consisting of a plurality of rod portions as described above is used for driving the earth into the ground
  • the head 44 or 54 is screwed into the screw threads 60 or 62 at the upper end portion of the lowermost rod portion 42a or 52a and then the driving rod is driven into the ground.
  • the head 44 or 54 is removed from the rod portion 424 or 52 a and tlien the second rod portion 42b or 52b is connected by screws 60 or 62 to the upper end of the first or lowermost rod portion 420 or 52a while the head 44 or 54 is attached to the upper endof the second rod portion 42b or 52b. Thereafter, the driving rod is driven again into the ground.
  • thelength of the driving rod 40 or 50 may be extended to a desired length.
  • the driving rod 40 is first fitted into the earth and the groove 48 at the leading end thereof is fitted with the engaging portion 26 or 26b of the earth 20 or 20b. In this state, the driving rod 40 is driven into the ground when the impact is applied to the head 44 ,s'othat the earth 20 or 201) is also driven into the ground.
  • the helically wound earth 20 having the same diameter throughout its length is driven into the ground as the driving rod 40 is driven into the ground, but the spirally-wound earth 20b is unwound from its inner end toward the outer end as the driving rod 40 is driven into the ground because the unwound earth 20b is wound around the driving rod 40 and extended therewith, thus forming the pitches or spacings 28b which serve as water passages.
  • the extendable driving rod 40 of the type described hereinabove may be of course utilized, by connecting the rod portions 42a, 42b, 42c and so on.
  • the driving rod 40 When the earth is driven into the ground to a desired depth of setting as shown in FIGS. 11 and 12, the driving rod 40 may be pulled out by applying the pulling force to the head thereof so that the groove 48 of the driving rod 40 is released from the engaging member 26 or 26b of the earth 20 or 20b while the earth 20 or 20b is set in place at a desired depth, maintaining a desired helical form. It will be seen therefore that the outer peripheral portions of the earth can positively contact with the surrounding soil, thus providing the complete earthing or grounding.
  • the driving rod 50 shown in FIG. 10 is used.
  • the driving rod 50 is fitted into the earth 20a or 20c so that the reduced diameter portion 58'of the driving rod may fit into the engaging'member 26a or 26c of the earth 20a or 200.
  • the driving force is applied to the head so that the upper end portion of the engaging member 26a or 26c of the earth 20a or 200 receives theimpact force from the shoulder portion 64 between the rod portion 52 and the reduced diameter portion 58, whereby the earth 20a is driven into the ground.
  • the spirally wound earth is unwound from its inner end and wound around the driving rod 50 so that the earth is driven into the ground while forming suitable spacings 28c which serve as water passages.
  • the force is applied to the head of the driving rod 50 so as to pull it out of the soil.
  • the earth 20a or 200 is set in a desired depth of setting while retaining its helical form with complete contact with the surrounding soil.
  • an electrically conductive solution which serves to reduce electrical resistance between the earth and its surrounding soil is poured from the upper open end of the earth. The solution penetrates through the spacings 28a and 280 into the surrounding soil, thereby forming an electrically conductive soil layer therearound.
  • An earth comprising a main body consisting of a length of an electrically conductive metallic element having suitable length and cross section and being wound in a helical form having a uniform outer diameter throughout the whole length thereof, a lead wire attached to the top of said main body, and an engaging member formed at the lower end of said main body by inwardly radially bending the lower end portion of said main body and having a pawl element attached thereto.
  • An earth comprising a main body consisting of a length of an electrically conductive metallic element having suitable length and cross section and being wound in a helical form an electrically conductive metallic element having suitable length and cross section and being wound in a flat spiral form, a lead wire attached to the outer end of said main body which becomes the upper end of said earth when said spirally wound main body is extended, and an engaging member in the form of a cylinder attached to the inner end of said main body which becomes the lower end of said earth when extended.

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  • Manufacturing Of Electrical Connectors (AREA)
  • Microwave Tubes (AREA)
US816341A 1968-11-15 1969-04-15 Helical earth Expired - Lifetime US3548069A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP8324368A JPS5111299B1 (enExample) 1968-11-15 1968-11-15
JP9649368A JPS516345B1 (enExample) 1968-12-30 1968-12-30

Publications (1)

Publication Number Publication Date
US3548069A true US3548069A (en) 1970-12-15

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US816341A Expired - Lifetime US3548069A (en) 1968-11-15 1969-04-15 Helical earth

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US (1) US3548069A (enExample)
DE (1) DE1921661C3 (enExample)
FR (1) FR2023343A1 (enExample)
GB (1) GB1246923A (enExample)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4227034A (en) * 1977-05-20 1980-10-07 Rijswijck Bernard P J M Van Earth ground assembly including an electrode and rod means which may be driven into the ground
FR2477323A1 (fr) * 1980-03-03 1981-09-04 Graipin Raymond Cylindre de prise de terre retractable
US20060126259A1 (en) * 2004-12-10 2006-06-15 E&S Grounding Solutions, A California Corporation Grounding system
US20060285267A1 (en) * 2005-06-18 2006-12-21 Setolite Lichttechnik Gmbh Lightning conductor
US9543741B1 (en) * 2014-05-16 2017-01-10 Jeffrey A. Pittman Temporary attachment equipotential grounding tool

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2476920A1 (fr) * 1980-02-25 1981-08-28 Graipin Raymond Prise de terre a foncage direct perfectionnee
CN104852164A (zh) * 2015-06-02 2015-08-19 国网青海省电力公司海南供电公司 一种机械式接地柱
CN106848628B (zh) * 2016-12-19 2019-04-09 重庆大学 一种最大化散流的螺旋形接地极及其电流溢散计算方法
CN108197393B (zh) * 2018-01-05 2021-03-16 重庆大学 一种具有降阻功能的螺旋形接地极设计方法

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4227034A (en) * 1977-05-20 1980-10-07 Rijswijck Bernard P J M Van Earth ground assembly including an electrode and rod means which may be driven into the ground
FR2477323A1 (fr) * 1980-03-03 1981-09-04 Graipin Raymond Cylindre de prise de terre retractable
US20060126259A1 (en) * 2004-12-10 2006-06-15 E&S Grounding Solutions, A California Corporation Grounding system
US7282637B2 (en) 2004-12-10 2007-10-16 E&S Grounding Solutions Grounding system
US20080173461A1 (en) * 2004-12-10 2008-07-24 E&S Grounding Solutions Method of using grounding system
US7832088B2 (en) 2004-12-10 2010-11-16 E & S Grounding Solutions, Inc. Method of using grounding system
US20060285267A1 (en) * 2005-06-18 2006-12-21 Setolite Lichttechnik Gmbh Lightning conductor
EP1734629A3 (de) * 2005-06-18 2008-02-06 SETOLITE Lichttechnik GmbH Halterung für einen Blitzableiter
US7593206B2 (en) 2005-06-18 2009-09-22 Setolite Lichttechnik Gmbh Lightening conductor
US9543741B1 (en) * 2014-05-16 2017-01-10 Jeffrey A. Pittman Temporary attachment equipotential grounding tool

Also Published As

Publication number Publication date
GB1246923A (en) 1971-09-22
DE1921661B2 (de) 1973-05-24
FR2023343A1 (enExample) 1970-08-21
DE1921661C3 (de) 1973-12-13
DE1921661A1 (de) 1970-07-02

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