US1922077A - Ground fitting - Google Patents

Ground fitting Download PDF

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Publication number
US1922077A
US1922077A US494283A US49428330A US1922077A US 1922077 A US1922077 A US 1922077A US 494283 A US494283 A US 494283A US 49428330 A US49428330 A US 49428330A US 1922077 A US1922077 A US 1922077A
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United States
Prior art keywords
wire
clamping
grounding
members
clamp
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Expired - Lifetime
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US494283A
Inventor
Stephen N Buchanan
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ABB Installation Products Inc
Original Assignee
Thomas and Betts Corp
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Publication date
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Priority to US494283A priority Critical patent/US1922077A/en
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Publication of US1922077A publication Critical patent/US1922077A/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
    • H01R4/58—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

Definitions

  • the invention relates to a grounding fitting by means of which a wire, such as a grounding wire, may be attached or clamped to the grounding fitting and the grounding fitting clamped to a grounded conductor, such as a water pipe, whereby a good electrical ground is obtained for a conduit or other protective covering for a wiring system.
  • a wire such as a grounding wire
  • a grounded conductor such as a water pipe
  • An object of the invention is to construct a grounding fitting which may be wrapped and tightened around a grounded conductor for electrical contact therewith and provides spaced wire clamping means between which a grounding wire is positioned and clamped through the agency of a wedging or pressure member which engages and bends at least one of the spaced clamping means to grip the grounding wire therebetween.
  • Another object of the invention is to produce a wire clamp in which one or more wires are inserted between spaced wire clamping means or members at least one of which is flexible, so that it can be bent to clamp the wires therebetween by means of pressure exerted through a wedging or pressure member.
  • Figure 1 is a cross-section through a grounded conductor or pipe having a flexible band grounding fitting wrapped around the pipe and a grounding wire inserted between wire clamping means or portions of the band preparatory to clamping a grounding wire therebetween.
  • Figure 2 is an enlarged view of the wire clamping means of the grounding fitting with one of the spaced flexible clamping portions of the flexible band bent inwardly towa ds the other portion to clamp the grounding wire therebetween.
  • Figure 3 is a cross-section through a conical washer or pressure member which forms part of the operating means for the wire clamp.
  • Figure 4 is a view looking down upon the wire clamp with a grounding wire inserted therein, as viewed from line 44 of Figure 2.
  • the grounding fitting in its preferred form consists of a flexible band which is wrapped around and tightened upon a grounded conductor such as a water pipe, to obtain good electrical connection therewith. A grounding wire is then clamped to the grounding fitting so that an electrical system may be grounded through the flexible band and grounded conductor.
  • the grounding fitting provides a flexible band 10 which is wrapped around a grounded conductor, such as the water pipe P shown in Figure 1, in order to obtain electrical contact therewith.
  • the flexible band 10 has spaced wire clamping portions or members 11 and 12, forming part of a wire clamping means, and between which a looped grounding wire W is placed so that the wire is doubly gripped by the wire clamp. Obviously two independent wires may be secured to the clamp instead'oi' the single looped wire W.
  • the spaced wire clamping members 11 and 12 project outwardly or transversely of the flexible band 10 and from the pipe P and a clamping screw 15 passes through passages in both members.
  • a bending abutment 13 is formed by bending the end of the flexible band 10 at right angles to the wire clamping members 11 and 12 and parallel to the clamping screw 15 which is positioned then between the pipe P and the abutment.
  • the end of the abutmentv 13 engages the flat face of the other end 16 of the flexible band 10 so that the two ends of the flexible band may be drawn together by the clamping screw 15 to tighten the band firmly upon the grounded conductor pipe P.
  • the operating means for the wire clamp and grounding fitting includes the clamping screw 15 which passes through the spaced wire clamping portions or members 11 and 12 and through a hole 18 in the end 16 of the band 10.
  • a number of spaced holes 18 are provided at spaced intervals in the end 16 of the flexible band 10 so that the band may be secured to pipe of various diameters and the clamping screw 15 passes through any one of the holes 18 dependent upon the diameter of the pipe to which the grounding fitting is secured.
  • a pressure member which in its preferred construction is a conical washer 28 contacts with the wire clamping member 11 and an operating nut 19 threaded upon the screw 15, completes the operating means.
  • the spaced wire clamping members 11 and 12 between which the grounding wire W is positioned are preferably constructed by raising a central portion or band 11 from the center of the flexible band 10, as shown in Figure 4. Wire clamping members 12 then remain upon either side of the wire clamping member 11 and provide spaced wire clamping members or means between which the grounding wire W may be inserted and at least one of the clamping members 11 or 12 is flexible so that the spaced clamping members may be drawn together to clamp or grip a grounding wire therebetween.
  • the separation of the spaced wire clamping portions or members 11 and 12 of the flexible band 10 form shoulders 22 and 23 at the ends of the wire clamping members.
  • the conical head 25 of the clamping screw 15 not only bends one of the wire clamping portions, such as the member 11, to grip the grounding wire W between the members 11 and 12, but also clamps the wire transversely against the shoulders 22 and 23.
  • the head of the ordinary conical headed screw, such as the head 25 of the screw 15 does not have a diameter sufiiciently large to contact with and bend the wire clamping member 11 near enough to the wire W to firmly clamp the wire against the shoulders 22 and 23 particularly where the wire clamping members are relatively long or the shoulders relatively widely separated.
  • a long wire clamping member is more easily bent and assures more positive clamping of a ground wire in the wire clamping means than a shorter clamping member.
  • a wedging or pressure member which is a conical washer 28 in its preferred form, is therefore provided having an external conical surface 29 which contacts with the wire clamping member 11 adjacent to the wire W and bends this member so that the wire is firmly clamped against the shoulders 22 and 23 as well as between the members 11 and 12. This assures firm clamping of the grounding wire W within the wire clamp.
  • the conical wedging member 28 may also have a conical central bore 30 to receive the conical head 25 of the clamping screw 15.
  • the wire clamping members 11 and 12 at least one of which is a flexible member, and having the relatively widely spaced shoulders 22 and 23 at the ends of the members provide a wire clamp irrespective of their association with a grounding fitting of any type or of the flexible band construction which is wrapped around a conductor as shown herein.
  • the clamping screw 15 with the pressure member or conical washer 28 forms the operating means whereby at least one of the flexible wire clamping mem bers 11 or 12 or both, may be bent or drawn together to clamp a wire W against the shoulders 22 and 23 and between the wire clamping members.
  • the invention contemplates such a wire clamp, irrespective of whether it is associated with a grounding fitting, such as that shown and described herein, or whether it is associated with any other structure requiring the clamping of a wire thereto.
  • a grounding fitting comprising a flexible band to wrap around a grounded conductor, a center band struck from the flexible band adjacent one end thereof forming spaced flexible wire clamping members and extending transversely therefrom, spaced shoulders relatively widely separated formed by the wire clamping members, passages through both members and through the flexible band, a clamping screw passing through the passages to clamp the band upon the conductor, and a pressure member on the screw having a width substantially less than the inner spacing between the wires and contacting with one of the wire clamping members to clamp the wire between the wire clamping members.
  • a grounding fitting comprising a flexible band to wrap around a groundedconductor, a center band struck from the flexible band adjacent one end thereof forming spaced flexible wire clamping members adjacent one end of the flexible band and extending transversely therefrom, spaced shoulders relatively widely separated formed by the wire clamping members, a bending abutment at the end of the flexible band and engaging the other end thereof, passages through both members and through the flexible band, a clamping screw passing through the passages to clamp the band upon the conductor, a conical head on the clamping screw, and a conical washer on the screw having a diameter at its point of contact with one of the wire clamping members substantially less than the inner spacing of the wires to bend the clamping member around the wire to clamp the wire between the members.

Landscapes

  • Connections By Means Of Piercing Elements, Nuts, Or Screws (AREA)

Description

Aug 9 5 N. BUCHANAN ,1 2%? GROUNDING FITTING Filed NOV. 8, 1930 INVENTOR STEPHEN/Mm Patented Aug. 15, 1933 PATENT OFFICE GROUND FITTING Stephen N. Buchanan, Elizabeth, N. 1., minor to The Thomas & Betta 00., Elizabeth, N. J., a Corporation of New Jersey Application November 8, 1930. Serial No. 494,283
2 Claims. (Cl. 173273) The invention relates to a grounding fitting by means of which a wire, such as a grounding wire, may be attached or clamped to the grounding fitting and the grounding fitting clamped to a grounded conductor, such as a water pipe, whereby a good electrical ground is obtained for a conduit or other protective covering for a wiring system. The wire clamp by means of which the grounding wire is secured to a grounding fitting or other structure also constitutes a part of the invention.
An object of the invention is to construct a grounding fitting which may be wrapped and tightened around a grounded conductor for electrical contact therewith and provides spaced wire clamping means between which a grounding wire is positioned and clamped through the agency of a wedging or pressure member which engages and bends at least one of the spaced clamping means to grip the grounding wire therebetween.
Another object of the invention is to produce a wire clamp in which one or more wires are inserted between spaced wire clamping means or members at least one of which is flexible, so that it can be bent to clamp the wires therebetween by means of pressure exerted through a wedging or pressure member.
Other objects of the invention will be more apparent from the following description taken in connection with the accompanying drawing, in which:
Figure 1 is a cross-section through a grounded conductor or pipe having a flexible band grounding fitting wrapped around the pipe and a grounding wire inserted between wire clamping means or portions of the band preparatory to clamping a grounding wire therebetween.
Figure 2 is an enlarged view of the wire clamping means of the grounding fitting with one of the spaced flexible clamping portions of the flexible band bent inwardly towa ds the other portion to clamp the grounding wire therebetween.
Figure 3 is a cross-section through a conical washer or pressure member which forms part of the operating means for the wire clamp.
Figure 4 is a view looking down upon the wire clamp with a grounding wire inserted therein, as viewed from line 44 of Figure 2.
The grounding fitting in its preferred form consists of a flexible band which is wrapped around and tightened upon a grounded conductor such as a water pipe, to obtain good electrical connection therewith. A grounding wire is then clamped to the grounding fitting so that an electrical system may be grounded through the flexible band and grounded conductor.
The grounding fitting provides a flexible band 10 which is wrapped around a grounded conductor, such as the water pipe P shown in Figure 1, in order to obtain electrical contact therewith. The flexible band 10 has spaced wire clamping portions or members 11 and 12, forming part of a wire clamping means, and between which a looped grounding wire W is placed so that the wire is doubly gripped by the wire clamp. Obviously two independent wires may be secured to the clamp instead'oi' the single looped wire W. The spaced wire clamping members 11 and 12 project outwardly or transversely of the flexible band 10 and from the pipe P and a clamping screw 15 passes through passages in both members.
A bending abutment 13 is formed by bending the end of the flexible band 10 at right angles to the wire clamping members 11 and 12 and parallel to the clamping screw 15 which is positioned then between the pipe P and the abutment. The end of the abutmentv 13 engages the flat face of the other end 16 of the flexible band 10 so that the two ends of the flexible band may be drawn together by the clamping screw 15 to tighten the band firmly upon the grounded conductor pipe P.
The operating means for the wire clamp and grounding fitting includes the clamping screw 15 which passes through the spaced wire clamping portions or members 11 and 12 and through a hole 18 in the end 16 of the band 10. A number of spaced holes 18 are provided at spaced intervals in the end 16 of the flexible band 10 so that the band may be secured to pipe of various diameters and the clamping screw 15 passes through any one of the holes 18 dependent upon the diameter of the pipe to which the grounding fitting is secured. A pressure member which in its preferred construction is a conical washer 28 contacts with the wire clamping member 11 and an operating nut 19 threaded upon the screw 15, completes the operating means.
Tightening of the nut 19'upon the screw 15 draws the ends of the flexible band 10 towards each other and securely clamps the band upon the pipe, as shown in Figure.2. The tightening of the nut 19 on the screw 15 also bends the flexible wire clamping member 11 downwardly to clamp the grounding wire W between the members 11 and 12 and thereby obtaining good electrical contact between the flexible band 11 and the grounding wire W. In order to clamp the wire W between the spaced wire clamping members 11 and 12, at least one of these members must be flexible or bendable although both membersmay have the same characteristic.
The spaced wire clamping members 11 and 12 between which the grounding wire W is positioned, are preferably constructed by raising a central portion or band 11 from the center of the flexible band 10, as shown in Figure 4. Wire clamping members 12 then remain upon either side of the wire clamping member 11 and provide spaced wire clamping members or means between which the grounding wire W may be inserted and at least one of the clamping members 11 or 12 is flexible so that the spaced clamping members may be drawn together to clamp or grip a grounding wire therebetween.
By the construction above described, the separation of the spaced wire clamping portions or members 11 and 12 of the flexible band 10 form shoulders 22 and 23 at the ends of the wire clamping members. Now the conical head 25 of the clamping screw 15 not only bends one of the wire clamping portions, such as the member 11, to grip the grounding wire W between the members 11 and 12, but also clamps the wire transversely against the shoulders 22 and 23. Now the head of the ordinary conical headed screw, such as the head 25 of the screw 15, does not have a diameter sufiiciently large to contact with and bend the wire clamping member 11 near enough to the wire W to firmly clamp the wire against the shoulders 22 and 23 particularly where the wire clamping members are relatively long or the shoulders relatively widely separated. Incidentally, a long wire clamping member is more easily bent and assures more positive clamping of a ground wire in the wire clamping means than a shorter clamping member. A wedging or pressure member which is a conical washer 28 in its preferred form, is therefore provided having an external conical surface 29 which contacts with the wire clamping member 11 adjacent to the wire W and bends this member so that the wire is firmly clamped against the shoulders 22 and 23 as well as between the members 11 and 12. This assures firm clamping of the grounding wire W within the wire clamp. The conical wedging member 28 may also have a conical central bore 30 to receive the conical head 25 of the clamping screw 15.
The wire clamping members 11 and 12, at least one of which is a flexible member, and having the relatively widely spaced shoulders 22 and 23 at the ends of the members provide a wire clamp irrespective of their association with a grounding fitting of any type or of the flexible band construction which is wrapped around a conductor as shown herein. Also the clamping screw 15 with the pressure member or conical washer 28 forms the operating means whereby at least one of the flexible wire clamping mem bers 11 or 12 or both, may be bent or drawn together to clamp a wire W against the shoulders 22 and 23 and between the wire clamping members. The invention contemplates such a wire clamp, irrespective of whether it is associated with a grounding fitting, such as that shown and described herein, or whether it is associated with any other structure requiring the clamping of a wire thereto.
What is claimed is:
1. A grounding fitting comprising a flexible band to wrap around a grounded conductor, a center band struck from the flexible band adjacent one end thereof forming spaced flexible wire clamping members and extending transversely therefrom, spaced shoulders relatively widely separated formed by the wire clamping members, passages through both members and through the flexible band, a clamping screw passing through the passages to clamp the band upon the conductor, and a pressure member on the screw having a width substantially less than the inner spacing between the wires and contacting with one of the wire clamping members to clamp the wire between the wire clamping members.
2. A grounding fitting comprising a flexible band to wrap around a groundedconductor, a center band struck from the flexible band adjacent one end thereof forming spaced flexible wire clamping members adjacent one end of the flexible band and extending transversely therefrom, spaced shoulders relatively widely separated formed by the wire clamping members, a bending abutment at the end of the flexible band and engaging the other end thereof, passages through both members and through the flexible band, a clamping screw passing through the passages to clamp the band upon the conductor, a conical head on the clamping screw, and a conical washer on the screw having a diameter at its point of contact with one of the wire clamping members substantially less than the inner spacing of the wires to bend the clamping member around the wire to clamp the wire between the members.
STEPHEN N. BUCHANAN.
US494283A 1930-11-08 1930-11-08 Ground fitting Expired - Lifetime US1922077A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2477759A (en) * 1945-09-14 1949-08-02 Lee Gebhart Battery corrosion eliminator
US2554169A (en) * 1946-03-30 1951-05-22 Thomas & Betts Corp Ground strap
US2768232A (en) * 1952-09-27 1956-10-23 Andrew J Kwake Cable and ground wire clamp for electrical outlet boxes

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2477759A (en) * 1945-09-14 1949-08-02 Lee Gebhart Battery corrosion eliminator
US2554169A (en) * 1946-03-30 1951-05-22 Thomas & Betts Corp Ground strap
US2768232A (en) * 1952-09-27 1956-10-23 Andrew J Kwake Cable and ground wire clamp for electrical outlet boxes

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