US3845449A - Cable shield clamp - Google Patents

Cable shield clamp Download PDF

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Publication number
US3845449A
US3845449A US00384932A US38493273A US3845449A US 3845449 A US3845449 A US 3845449A US 00384932 A US00384932 A US 00384932A US 38493273 A US38493273 A US 38493273A US 3845449 A US3845449 A US 3845449A
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US
United States
Prior art keywords
clamp
face
curved
pair
extension
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
US00384932A
Inventor
R Taylor
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
3M Co
Original Assignee
Minnesota Mining and Manufacturing Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Minnesota Mining and Manufacturing Co filed Critical Minnesota Mining and Manufacturing Co
Priority to US00384932A priority Critical patent/US3845449A/en
Priority to CA203,294A priority patent/CA1009327A/en
Priority to DE2431970A priority patent/DE2431970A1/en
Priority to BE147217A priority patent/BE818404A/en
Application granted granted Critical
Publication of US3845449A publication Critical patent/US3845449A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H01R4/646—Connections between or with conductive parts having primarily a non-electric function, e.g. frame, casing, rail for cables or flexible cylindrical bodies
    • 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
    • H02G15/00—Cable fittings
    • H02G15/08—Cable junctions
    • H02G15/10—Cable junctions protected by boxes, e.g. by distribution, connection or junction boxes
    • H02G15/103—Cable junctions protected by boxes, e.g. by distribution, connection or junction boxes with devices for relieving electrical stress
    • H02G15/105—Cable junctions protected by boxes, e.g. by distribution, connection or junction boxes with devices for relieving electrical stress connected to the cable shield only
    • 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
    • Y10T24/1441—Tangential screw
    • Y10T24/1451—Plural separable parts
    • 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.
    • Y10T24/34—Combined diverse multipart fasteners
    • Y10T24/3427—Clasp
    • Y10T24/3439—Plural clasps
    • 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.
    • Y10T24/39—Cord and rope holders
    • Y10T24/3958—Screw clamp
    • Y10T24/3962—Tangential bolt
    • 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.
    • Y10T24/39—Cord and rope holders
    • Y10T24/398—Bendable, ductible

Definitions

  • the clamp of the present invention is simple in construction, easily applied, and of fully adequate mechanical strength and electrical current-carrying capacity.
  • FIG. 1 is an elevational view showing two of the clamps of FIGS. 2 and 3 in use at a power cable splice area, the cable and cover being shown in phantom;
  • FIG. 2 is a plan view of a blank
  • FIG. 3 is a sectional elevation of an assembled clamp as shown in FIG. 1, taken approximately at line 3 3 thereof;
  • FIG. 4 is a sectional elevation showing a modified form of clamp with pre-connected jumper cable.
  • FIG. 5 is a plan view of a blank for an alternative form of clamp member.
  • Each clamp consists of two identically curved generally L-shaped plates l1, 12 held together in opposing and intermeshing relationship by a bolt 13 and nut 14.
  • Each plate is centrally perforate within a flat or very slightly laterally warped end portion 15; the remainder of the plate is curved along a circular path and extends over approximately 240 degrees of arc.
  • the end 15 extends radially from the curved portion.
  • the curved central segment 16 retains the full width of the end 15; the curved extension 17 is slightly less than one-half of such width.
  • the clamp members are made from a resilient plate of beryllium copper alloy No. 172 (Berylco 25"), A hard, 0.025 inch thick.
  • the blanks are each 3.219 inches long and 1.25 inches wide.
  • the end 15 is 0.700 inch long; the narrow extension 17 is 1.252 inches long and 0.600 inch in width.
  • the segments l6 and 17 are curved to an inside diameter of 1.200 inches.
  • the pieces are hardened by heat treatment to a Rockwell hardness, C scale, of 38-42, and are lightly tin plated.
  • the stiffness and resiliency of the hardened alloy are such that, once applied, the clamp cannot be moved by hand. Full electrical contact is obtained, and the current-carrying capacity is entirely adequate for the intended use.
  • FIG. 4 illustrates a modified clamp 40 wherein one.
  • clamp member 42 is raised within the full width central portion 46 to provide a rounded loop 48.
  • a segment 45 of a jumper in this case a stranded cable, is preattached within the loop by soldering as shown at 47.
  • the two halves 41, 42 are held together by bolt 43 and nut 44.
  • the free end of the jumper cable 45 is to be connected to the free end of the corresponding cable of an opposing clamp assembly in a splice situation as described in connection with FIG. 1, e.g., by bolt or other cable-joining means, not shown; alternatively, the free end may be connected directly to ground, e.g., in a termination situation.
  • the cable-ends may be attached to the clamps prior to installation, may be of any length and easily adjustable to any length of splice area, and are easily interconnected at any desired point.
  • the loop 48 adds to the spring compression reserve of the assembled clamp and this modification is particularly useful on cables of larger diameter and current-carrying capacity.
  • FIG. 5 Another modification is shown in FIG. 5, wherein the terminal extension of the central segment 56 of the generally L-shaped blank 51 is bifurcate, the two legs 57 and 58 intermeshing with similar extensions of an opposing blank when the two are formed and combined as described in connection with FIGS. 1 and 3.
  • a clamp comprising a pair of rigidly resilient generally L-shaped electrically conductive metal plates each formed to provide a substantially flat centrally perforate end section, a curved central section of the same width as said end section, and a curved extension of slightly less than one-half of said Width, the curved portions together extending over significantly more than one-half but less than three-fourths of a complete circle, the perforate end section being radially extended from said circle, the two pieces fitting together in face-to-face relationship with the curved portions terminally unconnected to define a circular clamping area.
  • Clamp of claim 1 including fastening means applied through said perforate end sections for holding said pair of plates together in face-to-face interfitting relationship.
  • Clamp of claim 4 including electrically conductive jumper means attached thereto.
  • one of said pair of plates includes a raised loop within the central section for solder connection with a jumper cable.
  • Clamp of claim 6 including a jumper cable segment soldered into said loop.

Landscapes

  • Cable Accessories (AREA)
  • Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)

Abstract

Two identically curved strips are intermeshed and bolted together to provide a circular clamp for making electrical connection with the ribbon shield of a power cable.

Description

[ 1 Oct. 29, 1974 CABLE SHIELD CLAMP 2/1927 Feige 339/251 FOREIGN PATENTS OR APPLICATIONS Inventor: Ronald D. Taylor, Blaine, Minn.
[73] Assignee: Minnesota Mining and Manufacturing Cmnpany, St Paul, 873,932 4 1942 339 251 France.,.............
5/1956 Germany.............
22 Filed: Aug. 2, 1973 21 Appl. No.: 384,932
Primary Examiner-loseph H. McGlynn Attorney, Agent, or FirmAlexander, Sell, Steldt & DeLaHunt [57] ABSTRACT Two identically curved strips are intermeshed and 52 us. 339/14 L, 24/115 A, 24/135 K, 24/284, 174/40 cc, 339/251 [58] Field of Search............ 339/14, 251
bolted together to provide a circular clamp for making 24/135 2791 284; 174/40 CC electrical connection with the ribbon shield ofa power cable.
7 Claims, 5 Drawing Figures References Cited UNITED STATES PATENTS 813,526 Simpson......................,...... 339/251 CABLE SHIELD CLAMP This invention relates to electric power distribution and is concerned particularly with improvements in the grounding of tape or ribbon shielded high voltage power cable.
In making a running splice in power cable it is necessary to join not only the ends of the current-carrying conductors but also the ends of the ribbon shields. For the latter purpose, conventional practice has involved installing jumper wires or cables across the splice. Prior art clamping devices of adequate strength and currentcarrying capacity have invariably been bulky, difficult to install, or otherwise unsatisfactory. Soldering of the jumpers to the shields results in a more compact structure but is difficult to accomplish under field conditrons.
The clamp of the present invention is simple in construction, easily applied, and of fully adequate mechanical strength and electrical current-carrying capacity.
In the drawing,
FIG. 1 is an elevational view showing two of the clamps of FIGS. 2 and 3 in use at a power cable splice area, the cable and cover being shown in phantom;
FIG. 2 is a plan view of a blank;
FIG. 3 is a sectional elevation of an assembled clamp as shown in FIG. 1, taken approximately at line 3 3 thereof;
FIG. 4 is a sectional elevation showing a modified form of clamp with pre-connected jumper cable; and
FIG. 5 is a plan view of a blank for an alternative form of clamp member.
Each clamp consists of two identically curved generally L-shaped plates l1, 12 held together in opposing and intermeshing relationship by a bolt 13 and nut 14. Each plate is centrally perforate within a flat or very slightly laterally warped end portion 15; the remainder of the plate is curved along a circular path and extends over approximately 240 degrees of arc. The end 15 extends radially from the curved portion. The curved central segment 16 retains the full width of the end 15; the curved extension 17 is slightly less than one-half of such width. When placed tightly face-to-face as in FIGS. I and 3, the two pieces intermesh to complete the circle at full width, and the curved portions are terminally unconnected.
In a specific Example for use with 15 KV ribbonshielded power cable, the clamp members are made from a resilient plate of beryllium copper alloy No. 172 (Berylco 25"), A hard, 0.025 inch thick. The blanks are each 3.219 inches long and 1.25 inches wide. The end 15 is 0.700 inch long; the narrow extension 17 is 1.252 inches long and 0.600 inch in width. The segments l6 and 17 are curved to an inside diameter of 1.200 inches. The pieces are hardened by heat treatment to a Rockwell hardness, C scale, of 38-42, and are lightly tin plated.
The method of application will be readily apparent on consideration of FIG. 1. The two halves are slipped over the bared shielded cable-ends into face-to-face intermeshing contact, the resiliency of the pieces being fully adequate for the purpose. Ajumper wire 19 of sufficient load-carrying capacity, previously provided with perforate contact terminal lugs 20, is fitted onto bolts 13 which are passed through the aligned perforations in the two pieces, and nut 14 is tightened in place to hold the assembly firmly together.
The stiffness and resiliency of the hardened alloy are such that, once applied, the clamp cannot be moved by hand. Full electrical contact is obtained, and the current-carrying capacity is entirely adequate for the intended use.
FIG. 4 illustrates a modified clamp 40 wherein one.
clamp member 42 is raised within the full width central portion 46 to provide a rounded loop 48. A segment 45 of a jumper, in this case a stranded cable, is preattached within the loop by soldering as shown at 47. The two halves 41, 42 are held together by bolt 43 and nut 44. The free end of the jumper cable 45 is to be connected to the free end of the corresponding cable of an opposing clamp assembly in a splice situation as described in connection with FIG. 1, e.g., by bolt or other cable-joining means, not shown; alternatively, the free end may be connected directly to ground, e.g., in a termination situation. Advantages of this structure are that the cable-ends may be attached to the clamps prior to installation, may be of any length and easily adjustable to any length of splice area, and are easily interconnected at any desired point. The loop 48 adds to the spring compression reserve of the assembled clamp and this modification is particularly useful on cables of larger diameter and current-carrying capacity.
Another modification is shown in FIG. 5, wherein the terminal extension of the central segment 56 of the generally L-shaped blank 51 is bifurcate, the two legs 57 and 58 intermeshing with similar extensions of an opposing blank when the two are formed and combined as described in connection with FIGS. 1 and 3.
What is claimed is as follows:
1. A clamp comprising a pair of rigidly resilient generally L-shaped electrically conductive metal plates each formed to provide a substantially flat centrally perforate end section, a curved central section of the same width as said end section, and a curved extension of slightly less than one-half of said Width, the curved portions together extending over significantly more than one-half but less than three-fourths of a complete circle, the perforate end section being radially extended from said circle, the two pieces fitting together in face-to-face relationship with the curved portions terminally unconnected to define a circular clamping area.
2. Clamp of claim 1 wherein said central section and said extension each extend over approximately of arc.
3. Clamp of claim I wherein said curved extension is in two parallel parts bifurcate.
4. Clamp of claim 1 including fastening means applied through said perforate end sections for holding said pair of plates together in face-to-face interfitting relationship.
5. Clamp of claim 4 including electrically conductive jumper means attached thereto.
6. Clamp of claim 4 wherein one of said pair of plates includes a raised loop within the central section for solder connection with a jumper cable.
7. Clamp of claim 6 including a jumper cable segment soldered into said loop.

Claims (7)

1. A clamp comprising a pair of rigidly resilient generally Lshaped electrically conductive metal plates each formed to provide a substantially flat centrally perforate end section, a curved central section of the same width as said end section, and a curved extension of slightly less than one-half of said width, the curved portions together extending over significantly more than one-half but less than three-fourths of a complete circle, the perforate end section being radially extended from said circle, the two pieces fitting together in face-to-face relationship with the curved portions terminally unconnected to define a circular clamping area.
2. Clamp of claim 1 wherein said central section and said extension each extend over approximately 120* of arc.
3. Clamp of claim 1 wherein said curved extension is in two parallel parts bifurcate.
4. Clamp of claim 1 including fastening means applied through said perforate end sections for holding said pair of plates together in face-to-face interfitting relationship.
5. Clamp of claim 4 including electrically conductive jumper means attached thereto.
6. Clamp of claim 4 wherein one of said pair of plates includes a raised loop within the central section for solder connection with a jumper cable.
7. Clamp of claim 6 including a jumper cable segment soldered into said loop.
US00384932A 1973-08-02 1973-08-02 Cable shield clamp Expired - Lifetime US3845449A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US00384932A US3845449A (en) 1973-08-02 1973-08-02 Cable shield clamp
CA203,294A CA1009327A (en) 1973-08-02 1974-06-25 Cable shield clamp
DE2431970A DE2431970A1 (en) 1973-08-02 1974-07-03 CONTACT CLAMP FOR CABLE SHIELD
BE147217A BE818404A (en) 1973-08-02 1974-08-01 CLAMP FOR ELECTRIC CABLE

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00384932A US3845449A (en) 1973-08-02 1973-08-02 Cable shield clamp

Publications (1)

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US3845449A true US3845449A (en) 1974-10-29

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US00384932A Expired - Lifetime US3845449A (en) 1973-08-02 1973-08-02 Cable shield clamp

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US (1) US3845449A (en)
BE (1) BE818404A (en)
CA (1) CA1009327A (en)
DE (1) DE2431970A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4236779A (en) * 1978-05-01 1980-12-02 Bunker Ramo Corporation EMI Shielded cable and connector assembly
DE10213519B4 (en) * 2001-03-26 2005-07-07 Yazaki Corp. Electromagnetic shielding structure

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US813526A (en) * 1905-04-11 1906-02-27 Cornelius R Thomas Ground connection for electric circuits.
US899636A (en) * 1907-04-20 1908-09-29 Gillette Vibber Co Grounding-clamp for electric wires.
US1616847A (en) * 1925-05-05 1927-02-08 Universal Ind Corp Ground clamp
FR873932A (en) * 1939-08-02 1942-07-23 Hermes Patentverwertungs Gmbh Device for fixing the terminals to the ends of the conductors
FR1419492A (en) * 1964-02-26 1965-11-26 Buderus Eisenwerk Electrical connection device for interconnected pipe sections with the interposition of a rubber seal

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US813526A (en) * 1905-04-11 1906-02-27 Cornelius R Thomas Ground connection for electric circuits.
US899636A (en) * 1907-04-20 1908-09-29 Gillette Vibber Co Grounding-clamp for electric wires.
US1616847A (en) * 1925-05-05 1927-02-08 Universal Ind Corp Ground clamp
FR873932A (en) * 1939-08-02 1942-07-23 Hermes Patentverwertungs Gmbh Device for fixing the terminals to the ends of the conductors
FR1419492A (en) * 1964-02-26 1965-11-26 Buderus Eisenwerk Electrical connection device for interconnected pipe sections with the interposition of a rubber seal

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4236779A (en) * 1978-05-01 1980-12-02 Bunker Ramo Corporation EMI Shielded cable and connector assembly
DE10213519B4 (en) * 2001-03-26 2005-07-07 Yazaki Corp. Electromagnetic shielding structure

Also Published As

Publication number Publication date
BE818404A (en) 1975-02-03
DE2431970A1 (en) 1975-02-13
CA1009327A (en) 1977-04-26

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