US3058087A - Grounding clamp for armored conductors - Google Patents

Grounding clamp for armored conductors Download PDF

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Publication number
US3058087A
US3058087A US73290A US7329060A US3058087A US 3058087 A US3058087 A US 3058087A US 73290 A US73290 A US 73290A US 7329060 A US7329060 A US 7329060A US 3058087 A US3058087 A US 3058087A
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Prior art keywords
clamp
ground
armored
end portion
ground conductor
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Expired - Lifetime
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US73290A
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Raymond F Piasecki
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ABB Installation Products Inc
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Thomas and Betts Corp
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Priority to US73290A priority Critical patent/US3058087A/en
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    • 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
    • H01R4/64—Connections between or with conductive parts having primarily a non-electric function, e.g. frame, casing, rail
    • H01R4/643—Connections between or with conductive parts having primarily a non-electric function, e.g. frame, casing, rail for rigid cylindrical bodies
    • 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
    • H01R4/28—Clamped connections, spring connections
    • H01R4/38—Clamped connections, spring connections utilising a clamping member acted on by screw or nut
    • H01R4/46—Clamping area between two screws placed side by side

Definitions

  • the invention relates to ground clamps for electrical conductors and more particularly to a saddle clamp adapted for grounding a bare end portion of an armored multi-strand or an armored solid copper conductor to a copper water pipe or the like.
  • the invention relates to a ground clamp of the character described which comprises a pair of similar sheet metal stampings each having an intermediate portion of substantially V configuration and including a machine screw threaded through each end of the clamp whereby the said stampings are adapted to embrace a water pipe and to be secured thereon by said screws, one of said stampings including means for securing the bare end portion of an armored ground conductor therebetween, means for compensating for the difference between the outer diameter of the ground conductor and the outer diameter of its armor, and means for securing the armor of said conductor against endwise movement relative to said ground clamp and said conductor.
  • ground clamps of this character possessed certain disadvantages in that they were not adapted for securing a bare end portion of an armored ground conductor to and between one of such clamps and a water pipe, while compensating for the diflerence in the diameter of the conductor and the outer diameter of the armor thereon, nor for securing the armor against endwise movement relative to the ground conductor and the ground clamp.
  • the present invention obviates the above noted disadvantages by providing a ground clamp wherein means are provided integral therewith for receiving a bare end portion of a ground conductor and the adjacent end portion of the armor thereon in pre-determined relation therewith upon securing the ground clamp about a water pipe or the like.
  • Another object of the invention is the provision of a ground clamp as specified, wherein a bare end portion of an armored ground conductor is secured to and between one half section of the clamp and a water pipe or the like upon securing the clamp thereon.
  • a further object of the invention is the provision of a ground clamp as specified wherein a first means struck out of the plane of one of the clamp sections, compensates for the difference between the diameter of the ground conductor per se and the outer diameter of the adjacent end portion of the armor enclosing the same.
  • Another object of the invention is the provision of a ground clamp as specified wherein a second means struck out of the plane of the aforesaid section of the two part clamp, in spaced axial alignment with the aforesaid first means, is adapted to seat between the spiral convolutions of the armor on the grounding conductor to prevent endwise movement of the armor relative to the clamp members and the ground conductor.
  • a further object of the invention is the provision of a ground clamp as specified wherein means integral with one half section of the clamp is operable to automatically secure a bare end portion of an armored ground conductor and the adjacent end portion of the armor thereon to and between the clamp and a water pipe or the like upon securing the clamp on said water pipe.
  • FIGURE 1 is a plan view showing a grounding clamp and associated armored ground conductor as secured on a copper water pipe or the like;
  • FIGURE 2 is an end view of the same
  • FIGURE 3 is a side elevation of the grounding clamp and associated armored ground conductor as assembled and secured on a copper water pipe or the like;
  • FIGURE 4 is a fragmentary elevational view showing the ground clamp in cross-section to illustrate the manner in which a bare end portion of an armored ground conductor and the adjacent end portion of the armor thereon is secured to and between the clamp and a copper water pipe or the like;
  • FIGURE 5 is a perspective view of one half section of the ground clamp which incorporates the integral means for securing the bare end portion of a ground conductor and the adjacent end portion of the armor thereon;
  • FIGURE 6 is a longitudinal sectional view of the clamp section shown in FIGURE 5.
  • the grounding clamp generally indicated at 10, comprises a pair of elongated, rectangular sheet metal stampings 12 and 14, of brass for example, each stamping having oppositely inclined surfaces '16, of V-for-m centrally thereof throughout its width, and its parallel side margins 18, flanged normal thereto for imparting rigidity thereto.
  • the stamping 12 is provided with a clearance opening 20, adjacent each end thereof, and the stamping 14 with an aligned screw threaded opening 22, adjacent each end thereof for the reception of a pair of machine screws 24, for adjustably connecting the respective stampings 12 and 14, whereby they are adapted to be secured about a copper water pipe 26, or the like.
  • the function of the ground clamp 10 is to secure an armored grounding conductor 28, in approved electrical contact with the copper water pipe 26.
  • the stamping 12 as best shown in FIGURE 5, is provided with an arcuate tongue 30 which is struck out of the plane thereof across the root of its oppositely inclined surfaces 16, and arched inwardly centrally of said surfaces 16, with its severed free end 32, remaining in the slot 34, which free end resulted from the striking out of the tongue St), to provide a loop for the passage therethrough of a bare end portion 36 of the armored ground conductor 28.
  • a transverse protuberance or projection 40 is formed integral with the upper face of the arcuate tongue 30, centrally thereof for a purpose hereinafter described.
  • the stamping 12, 'as best shown in FIGURE 5, is also provided with protuberance or projection 42, struck out of the plane of its V-forrnation 16, across the root thereof, in laterally spaced relation to the arched tongue 30, and at an angle corresponding to the pitch of the spiral convolutions of the armor on the ground conductor 28, whereby the projection 42, is adapted to seat between the convolutions of the spiral armor 38, as best shown in FIG- URES 1 and 4, to prevent endwise movement thereof relative to the stamping 12, and ground conductor 36, after the ground clamp 10, with the armored ground conductor 28, properly positioned therein, has been secured about the copper water pipe 26.
  • the inner faces of the intermediate V-surfaces of the stamping 12 are provided with a plurality of parallel linear serrations or score markings 44, to provide roughened surfaces adapted to substantially bite into the periphery of the copper water pipe 26, about which the clamp 10, is secured for the purposes set forth.
  • a saddle clamp for grounding an armored conductor on a cylindrical conduit comprising a pair of flanged sheet metal stampings, a pair of machine screws adjustably connecting said stampings at their respective end portions, each of said stampings having a pair of oppositely inclined surfaces formed centrally thereof provided with spaced, parallel linear scorings lengthwise thereof whereby said stampings are adapted to substantially embrace a cylindrical conduit in biting engagement therewith, an arcuate tongue struck out of the plane of one of said stampings centrally of and at the base of its inclined surfaces for receiving a bare end portion of an armored ground conductor therethrough, and a rounded protuberance raised out of the plane of said one stamping in spaced alignment with said arcuate tongue and at an angle thereto corresponding to the pitch of the spiral armor of said ground conductor, said tongue and said protuberance being adapted respectively to clamp said bare conductor end portion to said one stamping and to secure the spiral armor of said ground conductor against endwise movement relative to said one stamping upon securing said clamp

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  • Clamps And Clips (AREA)

Description

Oct. 9, 1962 R. F. PIASECKI 3,058,087
GROUNDING CLAMP FOR ARMORED CONDUCTORS Filed Dec. 2, 1960 INVENTORZ flay/2200a 4 Pz'aseckz @dww 9" 3,058,087 Patented Oct. 9, 1962 Filed Dec. 2, 1960, Ser. No. 73,290 1 Claim. (Cl. 339-95) The invention relates to ground clamps for electrical conductors and more particularly to a saddle clamp adapted for grounding a bare end portion of an armored multi-strand or an armored solid copper conductor to a copper water pipe or the like.
More specifically, the invention relates to a ground clamp of the character described which comprises a pair of similar sheet metal stampings each having an intermediate portion of substantially V configuration and including a machine screw threaded through each end of the clamp whereby the said stampings are adapted to embrace a water pipe and to be secured thereon by said screws, one of said stampings including means for securing the bare end portion of an armored ground conductor therebetween, means for compensating for the difference between the outer diameter of the ground conductor and the outer diameter of its armor, and means for securing the armor of said conductor against endwise movement relative to said ground clamp and said conductor.
As known heretofore, ground clamps of this character possessed certain disadvantages in that they were not adapted for securing a bare end portion of an armored ground conductor to and between one of such clamps and a water pipe, while compensating for the diflerence in the diameter of the conductor and the outer diameter of the armor thereon, nor for securing the armor against endwise movement relative to the ground conductor and the ground clamp.
The present invention obviates the above noted disadvantages by providing a ground clamp wherein means are provided integral therewith for receiving a bare end portion of a ground conductor and the adjacent end portion of the armor thereon in pre-determined relation therewith upon securing the ground clamp about a water pipe or the like.
Accordingly, it is an object of the invention to provide an improved grounding clamp for use with armored ground conductors which obviates the aforesaid disadvantages.
Another object of the invention is the provision of a ground clamp as specified, wherein a bare end portion of an armored ground conductor is secured to and between one half section of the clamp and a water pipe or the like upon securing the clamp thereon.
A further object of the invention is the provision of a ground clamp as specified wherein a first means struck out of the plane of one of the clamp sections, compensates for the difference between the diameter of the ground conductor per se and the outer diameter of the adjacent end portion of the armor enclosing the same.
Another object of the invention is the provision of a ground clamp as specified wherein a second means struck out of the plane of the aforesaid section of the two part clamp, in spaced axial alignment with the aforesaid first means, is adapted to seat between the spiral convolutions of the armor on the grounding conductor to prevent endwise movement of the armor relative to the clamp members and the ground conductor.
A further object of the invention is the provision of a ground clamp as specified wherein means integral with one half section of the clamp is operable to automatically secure a bare end portion of an armored ground conductor and the adjacent end portion of the armor thereon to and between the clamp and a water pipe or the like upon securing the clamp on said water pipe.
Various other objects, advantages and features of the invention will become apparent from the following detailed description when read in connection with the accompanying drawing, in which:
FIGURE 1, is a plan view showing a grounding clamp and associated armored ground conductor as secured on a copper water pipe or the like;
FIGURE 2 is an end view of the same;
FIGURE 3 is a side elevation of the grounding clamp and associated armored ground conductor as assembled and secured on a copper water pipe or the like;
FIGURE 4 is a fragmentary elevational view showing the ground clamp in cross-section to illustrate the manner in which a bare end portion of an armored ground conductor and the adjacent end portion of the armor thereon is secured to and between the clamp and a copper water pipe or the like;
FIGURE 5 is a perspective view of one half section of the ground clamp which incorporates the integral means for securing the bare end portion of a ground conductor and the adjacent end portion of the armor thereon; and
FIGURE 6 is a longitudinal sectional view of the clamp section shown in FIGURE 5.
Referring to the drawing, the grounding clamp, generally indicated at 10, comprises a pair of elongated, rectangular sheet metal stampings 12 and 14, of brass for example, each stamping having oppositely inclined surfaces '16, of V-for-m centrally thereof throughout its width, and its parallel side margins 18, flanged normal thereto for imparting rigidity thereto.
The stamping 12 is provided with a clearance opening 20, adjacent each end thereof, and the stamping 14 with an aligned screw threaded opening 22, adjacent each end thereof for the reception of a pair of machine screws 24, for adjustably connecting the respective stampings 12 and 14, whereby they are adapted to be secured about a copper water pipe 26, or the like.
As clearly shown in FIGURES 1 through 4, the function of the ground clamp 10, is to secure an armored grounding conductor 28, in approved electrical contact with the copper water pipe 26. .For this purpose, the stamping 12, as best shown in FIGURE 5, is provided with an arcuate tongue 30 which is struck out of the plane thereof across the root of its oppositely inclined surfaces 16, and arched inwardly centrally of said surfaces 16, with its severed free end 32, remaining in the slot 34, which free end resulted from the striking out of the tongue St), to provide a loop for the passage therethrough of a bare end portion 36 of the armored ground conductor 28. To compensate for the difference in diameter between the bare end portion 36 of the ground conductor 28, and its spiral armor 28, a transverse protuberance or projection 40, is formed integral with the upper face of the arcuate tongue 30, centrally thereof for a purpose hereinafter described.
The stamping 12, 'as best shown in FIGURE 5, is also provided with protuberance or projection 42, struck out of the plane of its V-forrnation 16, across the root thereof, in laterally spaced relation to the arched tongue 30, and at an angle corresponding to the pitch of the spiral convolutions of the armor on the ground conductor 28, whereby the projection 42, is adapted to seat between the convolutions of the spiral armor 38, as best shown in FIG- URES 1 and 4, to prevent endwise movement thereof relative to the stamping 12, and ground conductor 36, after the ground clamp 10, with the armored ground conductor 28, properly positioned therein, has been secured about the copper water pipe 26.
From a consideration of FIGURES 2 and 4, it will be readily apparent that in securing the clamp 10, with the armored ground conductor 28, properly inserted therebetween, the final adjustment of the screws 24, forces the arched tongue 30, into intimate bearing engagement with the bare end portion of the ground conductor 36, and end 36 into intimate bearing engagement with the stamping 12, at the root 'of its V-surfaces 16, whereby an approved ground connection is made with the copper water pipe 26, or the like.
As shown in FIGURE 5, the inner faces of the intermediate V-surfaces of the stamping 12, are provided with a plurality of parallel linear serrations or score markings 44, to provide roughened surfaces adapted to substantially bite into the periphery of the copper water pipe 26, about which the clamp 10, is secured for the purposes set forth.
While the invention has been illustrated and described with respect to a preferred embodiment thereof, it is to be expressly understood that various changes and modifications may be made therein without departing from the inventive concept underlying the same. Therefore, the invention is not to be limited except as is necessitated by the prior art and the scope of the appended claim.
What is claimed is:
A saddle clamp for grounding an armored conductor on a cylindrical conduit comprising a pair of flanged sheet metal stampings, a pair of machine screws adjustably connecting said stampings at their respective end portions, each of said stampings having a pair of oppositely inclined surfaces formed centrally thereof provided with spaced, parallel linear scorings lengthwise thereof whereby said stampings are adapted to substantially embrace a cylindrical conduit in biting engagement therewith, an arcuate tongue struck out of the plane of one of said stampings centrally of and at the base of its inclined surfaces for receiving a bare end portion of an armored ground conductor therethrough, and a rounded protuberance raised out of the plane of said one stamping in spaced alignment with said arcuate tongue and at an angle thereto corresponding to the pitch of the spiral armor of said ground conductor, said tongue and said protuberance being adapted respectively to clamp said bare conductor end portion to said one stamping and to secure the spiral armor of said ground conductor against endwise movement relative to said one stamping upon securing said clamp on said cylindrical conduit, and a transverse substantially rectangular projection integral with said arcuate tongue centrally of its outer periphery adapted to compensate for the dilference between the diameter of the bare end portion of said ground conductor and the outer diameter of its spiral armor.
References Cited in the file of this patent UNITED STATES PATENTS 1,914,010 Eccles June 13, 1933 2,490,253 Buchanan Dec. 6, 1949 2,533,897 Reddock Dec. 12, 1950 FOREIGN PATENTS 23,579/29 Australia May 28, 1930 528,644 Canada Aug. 7, 1956
US73290A 1960-12-02 1960-12-02 Grounding clamp for armored conductors Expired - Lifetime US3058087A (en)

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE28468E (en) * 1971-09-16 1975-07-08 Cable shield connector
US3901577A (en) * 1974-01-25 1975-08-26 Gen Signal Corp Grounding clamps and connectors therefor
US3988052A (en) * 1975-06-30 1976-10-26 I-T-E Imperial Corporation Ground clamp
US5364281A (en) * 1993-06-01 1994-11-15 Philly D. Harrison Electrical connector system for grounding member and ground wire
US6371774B2 (en) * 2000-01-12 2002-04-16 Tyco Electronics Simel S.A. Tap connector
US20050255727A1 (en) * 2004-05-12 2005-11-17 Alladice Carlton C Earthing pipes
US7780461B1 (en) * 2009-03-03 2010-08-24 Mike Vernica Midpoint cable electrical ground clamp
US20100299909A1 (en) * 2009-02-27 2010-12-02 Burndy Technology Llc Ground connector
US8177563B1 (en) 2010-10-27 2012-05-15 Mike Vernica Swivel ground clamp for bare armor wire
US20140073203A1 (en) * 2012-09-11 2014-03-13 Tyco Electronics Canada Ulc Electrical Connectors and Methods for Using Same
US8864504B1 (en) * 2012-06-10 2014-10-21 Arlington Industries, Inc. Intersystem grounding clamp with serrated gripping surfaces and a plurality of grounding terminals
US20140374138A1 (en) * 2012-01-13 2014-12-25 Tyco Electronic Uk Ltd. Conductive connection assembly, method for manufacturing the same and kit for a body comprising carbon fibre-reinforced material
US20150144747A1 (en) * 2013-11-26 2015-05-28 Jose Oscar Castellanos Attachment plate and system for pipe-support interface

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2357929A (en) * 1929-11-13 1930-06-10 Gerard & Goodman Limited Improvements in and connected with earthing clips for electrical wiring
US1914010A (en) * 1930-09-18 1933-06-13 Nat Engineering Corp Electrical connection
US2490253A (en) * 1946-06-18 1949-12-06 Buchanan Electrical Prod Corp Armored cable connector
US2533897A (en) * 1946-05-10 1950-12-12 Morris D Reddock Ground clamp
CA528644A (en) * 1956-08-07 Cutler Philip Combined electrical connectors and ground clamps

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA528644A (en) * 1956-08-07 Cutler Philip Combined electrical connectors and ground clamps
AU2357929A (en) * 1929-11-13 1930-06-10 Gerard & Goodman Limited Improvements in and connected with earthing clips for electrical wiring
US1914010A (en) * 1930-09-18 1933-06-13 Nat Engineering Corp Electrical connection
US2533897A (en) * 1946-05-10 1950-12-12 Morris D Reddock Ground clamp
US2490253A (en) * 1946-06-18 1949-12-06 Buchanan Electrical Prod Corp Armored cable connector

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE28468E (en) * 1971-09-16 1975-07-08 Cable shield connector
US3901577A (en) * 1974-01-25 1975-08-26 Gen Signal Corp Grounding clamps and connectors therefor
US3988052A (en) * 1975-06-30 1976-10-26 I-T-E Imperial Corporation Ground clamp
US5364281A (en) * 1993-06-01 1994-11-15 Philly D. Harrison Electrical connector system for grounding member and ground wire
US5460532A (en) * 1993-06-01 1995-10-24 Philly D. Harrison Electrical connector system for grounding member and ground wire
US6371774B2 (en) * 2000-01-12 2002-04-16 Tyco Electronics Simel S.A. Tap connector
US20050255727A1 (en) * 2004-05-12 2005-11-17 Alladice Carlton C Earthing pipes
US7008244B2 (en) * 2004-05-12 2006-03-07 Carlton Colin Alladice Earthing pipes
US20100299909A1 (en) * 2009-02-27 2010-12-02 Burndy Technology Llc Ground connector
US8341822B2 (en) * 2009-02-27 2013-01-01 Hubbell Incorporated Ground connector
US20100227483A1 (en) * 2009-03-03 2010-09-09 Mike Vernica Midpoint cable electrical ground clamp
US7780461B1 (en) * 2009-03-03 2010-08-24 Mike Vernica Midpoint cable electrical ground clamp
US8177563B1 (en) 2010-10-27 2012-05-15 Mike Vernica Swivel ground clamp for bare armor wire
US20140374138A1 (en) * 2012-01-13 2014-12-25 Tyco Electronic Uk Ltd. Conductive connection assembly, method for manufacturing the same and kit for a body comprising carbon fibre-reinforced material
US9859630B2 (en) * 2012-01-13 2018-01-02 Tyco Electronics Uk Ltd. Conductive connection assembly, method for manufacturing the same and kit for a body comprising carbon fibre-reinforced material
US8864504B1 (en) * 2012-06-10 2014-10-21 Arlington Industries, Inc. Intersystem grounding clamp with serrated gripping surfaces and a plurality of grounding terminals
US20140073203A1 (en) * 2012-09-11 2014-03-13 Tyco Electronics Canada Ulc Electrical Connectors and Methods for Using Same
US9147967B2 (en) * 2012-09-11 2015-09-29 Tyco Electronics Canada Ulc Electrical connectors and methods for using same
US20150144747A1 (en) * 2013-11-26 2015-05-28 Jose Oscar Castellanos Attachment plate and system for pipe-support interface
US9416895B2 (en) * 2013-11-26 2016-08-16 Jose Oscar Castellanos Attachment system for supporting a pipe

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