US3129994A - Electric contact clamp - Google Patents

Electric contact clamp Download PDF

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Publication number
US3129994A
US3129994A US198867A US19886762A US3129994A US 3129994 A US3129994 A US 3129994A US 198867 A US198867 A US 198867A US 19886762 A US19886762 A US 19886762A US 3129994 A US3129994 A US 3129994A
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US
United States
Prior art keywords
conduit
band
screw
opposite end
clamp
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
US198867A
Inventor
James R Harmon
Harold G Schneider
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Individual
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Priority to US198867A priority Critical patent/US3129994A/en
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Publication of US3129994A publication Critical patent/US3129994A/en
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Expired - Lifetime legal-status Critical Current

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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
    • H01R4/26—Connections in which at least one of the connecting parts has projections which bite into or engage the other connecting part in order to improve the contact
    • 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
    • H01R4/60—Connections between or with tubular conductors
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T24/00—Buckles, buttons, clasps, etc.
    • Y10T24/14—Bale and package ties, hose clamps
    • Y10T24/1412—Bale and package ties, hose clamps with tighteners
    • Y10T24/1416—Winder
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T24/00—Buckles, buttons, clasps, etc.
    • Y10T24/14—Bale and package ties, hose clamps
    • Y10T24/1412—Bale and package ties, hose clamps with tighteners
    • Y10T24/1439—Radial screw

Definitions

  • Ground clamps prior to this invention depended upon a plurality of pierced holes in the strap thereof for adjusting same to conduits of different diameters.
  • the conventional screw means for engagement with the aforesaid holes not only limited the range of adjustment but also limited the strength of the strap and the resultant security of contact with the conduit.
  • the present invention overcomes the above objections and disadvantages by the provision of the combination of straps and screw means wherein a key is used to forcibly Wrap the strap when in tightened position and securely engage the conduit for forming a secure terminus for a ground conductor and is a principal object of the invention.
  • a further object of the invention is a ground clamp for conduits including a body member, a strap, and a key for securely wrapping the strap around the conduit including a screw means in said body for piercing and retaining the strap in a tensioned position around said conduit.
  • FIG. 1 is a side view of the ground clamp attached to a conduit.
  • FIG. 2 is a side view of the clamp shown in FIG. 1.
  • FIG. 3 is a fragmentary cross sectional elevation taken through the clamp shown in FIG. 2.
  • FIG. 4 is the same as FIG. 3 with elements in changed position.
  • the ground clamp comprises a hollow rectangular body member 1 with a flexible metal strap 2 secured by one end 3 to a lower portion of body 1 as shown.
  • the opposite end portion 4 is engaged in the slotted end of a conventional key 5 having a slotted shank, for manual finger rotation against the side of body 1 for clamping the strap around the outer periphery of conduit 6.
  • a screw 7 having a pointed lower end is threaded through the body 1 as shown and when the strap 2 is clamped around the conduit 3 a bend 8 around the corner of portion 3 will temporarily hold the strap in clamped position.
  • An electric ground clamp for a conduit for retaining a conductor comprising a terminal screw with one end thereof terminating in a piercing point and the opposite end thereof terminating in a head,
  • a flexible band having one end thereof secured to said member and adapted to encircle said conduit with the opposite end portion thereof positioned through and extending from said member between the threaded sides thereof and in overlapping position with respect to said one end,
  • a key means having an axial slot therein engaged with the said opposite end of said band transverse thereto whereby the manual finger rotation of said key will wind said band thereon in oblique position against one side of said member and tension said band around said conduit and whereby said point of said screw will pierce said opposite end portion of said band and engage said conduit for securing said clamp to said conduit when said head is driven.

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  • Clamps And Clips (AREA)

Description

P 1964 J. R. HARMON ETA]. 3,
ELECTRIC CONTACT CLAMP Filed May 31, 1962 VINVENTORS JAMES R. HARMON HAROLD G.SCHNE|DER United States Patent 3,129,994 ELECTRIC CONTACT CLAMP James R. Harmon, 6845 SW. 17th St., Miami, Fla., and Harold G. Schneider, 8867 Carlyle Ave., Surfside, Fla. Filed May 31, 1962, Ser. No. 198,867 3 Claims. (Cl. 33995) This invention relates in general to electric ground clamps and more particularly to an adjustable clamp for tightly securing conductors to metal conduits of a Wide range of diameters.
Ground clamps prior to this invention depended upon a plurality of pierced holes in the strap thereof for adjusting same to conduits of different diameters. The conventional screw means for engagement with the aforesaid holes not only limited the range of adjustment but also limited the strength of the strap and the resultant security of contact with the conduit.
The present invention overcomes the above objections and disadvantages by the provision of the combination of straps and screw means wherein a key is used to forcibly Wrap the strap when in tightened position and securely engage the conduit for forming a secure terminus for a ground conductor and is a principal object of the invention.
A further object of the invention is a ground clamp for conduits including a body member, a strap, and a key for securely wrapping the strap around the conduit including a screw means in said body for piercing and retaining the strap in a tensioned position around said conduit.
Reference is had to US. patent application Serial No. 179,439, now Patent No. 3,094,366.
These and other objects and advantages in one embodiment of the invention are described and shown in the appended specification and drawing in which:
FIG. 1 is a side view of the ground clamp attached to a conduit.
FIG. 2 is a side view of the clamp shown in FIG. 1.
FIG. 3 is a fragmentary cross sectional elevation taken through the clamp shown in FIG. 2.
FIG. 4 is the same as FIG. 3 with elements in changed position.
Referring to FIGS. 1 and 2, the ground clamp comprises a hollow rectangular body member 1 with a flexible metal strap 2 secured by one end 3 to a lower portion of body 1 as shown. The opposite end portion 4 is engaged in the slotted end of a conventional key 5 having a slotted shank, for manual finger rotation against the side of body 1 for clamping the strap around the outer periphery of conduit 6. Referring to FIGS. 3-4, a screw 7 having a pointed lower end is threaded through the body 1 as shown and when the strap 2 is clamped around the conduit 3 a bend 8 around the corner of portion 3 will temporarily hold the strap in clamped position. When the screw 7 is tightened the pointed end thereof will pierce the strap 2 and move through a hole in portion 3 and into the lower portion of body 1 and embed itself into the outer surface of the conduit. A terminal 9 or a bare conductor is then clamped under nut 10 which serves the dual purpose of securing the conductor or terminal to the body 1 and to serve as a lock nut for holding the screw in clamped position. It is apparent that the surplus strap and the key may be cut oii at 11 and discarded as shown FIGS. 3 and 4.
It is understood that certain modifications in the above construction, utilizing the features described, are intended to come within the scope of the appended claims.
Having described our invention, we claim:
1. An electric ground clamp for a conduit for retaining a conductor comprising a terminal screw with one end thereof terminating in a piercing point and the opposite end thereof terminating in a head,
a hollow rectangular body member threaded through opposite sides thereof and adapted to adjustably retain said screw for axial movement therethrough into contact with said conduit when driven by said head,
a flexible band having one end thereof secured to said member and adapted to encircle said conduit with the opposite end portion thereof positioned through and extending from said member between the threaded sides thereof and in overlapping position with respect to said one end,
a key means having an axial slot therein engaged with the said opposite end of said band transverse thereto whereby the manual finger rotation of said key will wind said band thereon in oblique position against one side of said member and tension said band around said conduit and whereby said point of said screw will pierce said opposite end portion of said band and engage said conduit for securing said clamp to said conduit when said head is driven.
2. The construction recited in claim 1 including said one end having a pre-pierced hole therein for engagement by said screw when the latter has pierced said band.
3. The construction recited in claim 1 including a screw thread means associated with said member for securing said conductor to said member.
References Cited in the file of this patent UNITED STATES PATENTS 972,489 Adams Oct. 11, 1910 1,505,314 Cox Aug. 19, 1924 1,675,163 Colburn June 26, 1928 2,158,802 Redlon May 16, 1939 FOREIGN PATENTS 175,085 Great Britain Feb. 16, 1922 233,116 Great Britain May 7, 1925 834,091 Great Britain May 4, 1960 40,573 France Apr. 19, 1932

Claims (1)

1. AN ELECTRIC GROUND CLAMP FOR A CONDUIT FOR RETAINING A CONDUCTOR COMPRISING A TERMINAL SCREW WITH ONE END THEREOF TERMINATING IN A PIERCING POINT AND THE OPPOSITE END THEREOF TERMINATING IN A HEAD, A HOLLOW RECTANGULAR BODY MEMBER THREADED THROUGH OPPOSITE SIDES THEREOF AND ADAPTED TO ADJUSTABLY RETAIN SAID SCREW FOR AXIAL MOVEMENT THERETHROUGH INTO CONTACT WITH SAID CONDUIT WHEN DRIVEN BY SAID HEAD, A FLEXIBLE BAND HAVING ONE END THEREOF SECURED TO SAID MEMBER AND ADAPTED TO ENCIRCLE SAID CONDUIT WITH THE OPPOSITE END PORTION THEREOF POSITIONED THROUGH AND EXTENDING FROM SAID MEMBER BETWEEN THE THREADED SIDES THEREOF AND IN OVERLAPPING POSITION WITH RESPECT TO SAID ONE END, A KEY MEANS HAVING AN AXIAL SLOT THEREIN ENGAGED WITH THE SAID OPPOSITE END OF SAID BAND TRANSVERSE THERETO WHEREBY THE MANUAL FINGER ROTATION OF SAID KEY WILL WIND SAID BAND THEREON IN OBLIQUE POSITION AGAINST ONE SIDE OF SAID MEMBER AND TENSION SAID BAND AROUND SAID CONDUIT AND WHEREBY SAID POINT OF SAID SCREW WILL PIERCE SAID OPPOSITE END PORTION OF SAID BAND AND ENGAGE SAID CONDUIT FOR SECURING SAID CLAMP TO SAID CONDUIT WHEN SAID HEAD IS DRIVEN.
US198867A 1962-05-31 1962-05-31 Electric contact clamp Expired - Lifetime US3129994A (en)

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3254386A (en) * 1964-02-24 1966-06-07 Roger W Mcbrien Laboratory clamp structure
US3648599A (en) * 1969-04-24 1972-03-14 Agfa Gevaert Ag Adjustable sheet advancing device
US3699494A (en) * 1970-10-15 1972-10-17 John T Thompson Grounding connector
US4397436A (en) * 1980-08-13 1983-08-09 Bicc Limited Device for securing at least one cable, pipe or other elongate member
US4558493A (en) * 1983-12-27 1985-12-17 Ralph Dowdell Variably accessible band clamp
US4776808A (en) * 1987-03-16 1988-10-11 Davidson Richard J Ground contactor
USD486791S1 (en) 2003-01-29 2004-02-17 Senior Industries, Inc. Ground block
USD487427S1 (en) 2003-01-29 2004-03-09 Senior Industries, Inc. Ground block
US6877996B1 (en) 2002-11-27 2005-04-12 Senior Industries, Inc. Grounding connector
US20100221935A1 (en) * 2009-02-27 2010-09-02 Fci Americas Technology, Inc. Ground connector
US20100327132A1 (en) * 2007-11-12 2010-12-30 Patrick David Maguire Attachments, brackets, and support assemblies
US20110065333A1 (en) * 2009-09-11 2011-03-17 Burndy Technology Llc Pedestal ground connector

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US972489A (en) * 1909-06-28 1910-10-11 Monroe Electrical Mfg Company Ground-clamp.
GB175085A (en) * 1920-11-16 1922-02-16 Ernest Swainson Improvements in earthing clips for electric conductors
US1505314A (en) * 1920-08-19 1924-08-19 Warren R Cox Electrical grounding clamp
GB233116A (en) * 1924-04-09 1925-05-07 William Joseph Davis Improvements in electric couplings for earth connections
US1675163A (en) * 1926-08-13 1928-06-26 Super Ball Antenna Co Inc Ground clamp
FR40573E (en) * 1931-01-13 1932-07-27 Hose clamp
US2158802A (en) * 1938-04-19 1939-05-16 Osgood M Redlon Pipe hanger
GB834091A (en) * 1957-10-01 1960-05-04 Henry Allday & Son 1922 Ltd Electric earthing clips

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US972489A (en) * 1909-06-28 1910-10-11 Monroe Electrical Mfg Company Ground-clamp.
US1505314A (en) * 1920-08-19 1924-08-19 Warren R Cox Electrical grounding clamp
GB175085A (en) * 1920-11-16 1922-02-16 Ernest Swainson Improvements in earthing clips for electric conductors
GB233116A (en) * 1924-04-09 1925-05-07 William Joseph Davis Improvements in electric couplings for earth connections
US1675163A (en) * 1926-08-13 1928-06-26 Super Ball Antenna Co Inc Ground clamp
FR40573E (en) * 1931-01-13 1932-07-27 Hose clamp
US2158802A (en) * 1938-04-19 1939-05-16 Osgood M Redlon Pipe hanger
GB834091A (en) * 1957-10-01 1960-05-04 Henry Allday & Son 1922 Ltd Electric earthing clips

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3254386A (en) * 1964-02-24 1966-06-07 Roger W Mcbrien Laboratory clamp structure
US3648599A (en) * 1969-04-24 1972-03-14 Agfa Gevaert Ag Adjustable sheet advancing device
US3699494A (en) * 1970-10-15 1972-10-17 John T Thompson Grounding connector
US4397436A (en) * 1980-08-13 1983-08-09 Bicc Limited Device for securing at least one cable, pipe or other elongate member
US4558493A (en) * 1983-12-27 1985-12-17 Ralph Dowdell Variably accessible band clamp
US4776808A (en) * 1987-03-16 1988-10-11 Davidson Richard J Ground contactor
US6877996B1 (en) 2002-11-27 2005-04-12 Senior Industries, Inc. Grounding connector
USD487427S1 (en) 2003-01-29 2004-03-09 Senior Industries, Inc. Ground block
USD486791S1 (en) 2003-01-29 2004-02-17 Senior Industries, Inc. Ground block
US20100327132A1 (en) * 2007-11-12 2010-12-30 Patrick David Maguire Attachments, brackets, and support assemblies
US8870138B2 (en) * 2007-11-12 2014-10-28 Thule Ip Ab Attachments, brackets, and support assemblies
US9452799B2 (en) 2007-11-12 2016-09-27 Thule Ip Ab Attachments, brackets, and support assemblies
US20100221935A1 (en) * 2009-02-27 2010-09-02 Fci Americas Technology, Inc. Ground connector
US7794243B1 (en) * 2009-02-27 2010-09-14 Burndy Technology, LLC Ground connector
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
US20110065333A1 (en) * 2009-09-11 2011-03-17 Burndy Technology Llc Pedestal ground connector
US8313334B2 (en) 2009-09-11 2012-11-20 Hubbell Incorporated Pedestal ground connector

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