US3744012A - Teeter terminal clamp - Google Patents

Teeter terminal clamp Download PDF

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Publication number
US3744012A
US3744012A US00241581A US3744012DA US3744012A US 3744012 A US3744012 A US 3744012A US 00241581 A US00241581 A US 00241581A US 3744012D A US3744012D A US 3744012DA US 3744012 A US3744012 A US 3744012A
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United States
Prior art keywords
head
shank
clamp
plate
protrusion
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
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US00241581A
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English (en)
Inventor
C Gutshall
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Elco Industries Inc
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Elco Industries Inc
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.)
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Publication date
Application filed by Elco Industries Inc filed Critical Elco Industries Inc
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Publication of US3744012A publication Critical patent/US3744012A/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
    • H01R4/28—Clamped connections, spring connections
    • H01R4/38—Clamped connections, spring connections utilising a clamping member acted on by screw or nut
    • H01R4/44—Clamping areas on both sides of screw

Definitions

  • the plate having on the side adjacent the head at least one, substantially-circular or oval recess comple- [56 Ref ren g Cited menting the shape of the protrusion whereby the ex- UNITED STATES PATENTS tremity of the protrusion registers with an intermediate portion of the inner wall of the recess when the protrusion and recess are in registration, the plate also having Primary ExaminerJoseph H. McGlynn Attorney-Albert H. Pendleton, William J. Birmingham on the other side conductor-engaging, anti-pullout surface irregularities; and means for retaining the plate on the shank adjacent the head.
  • This invention relates to terminal clamps of the threaded type which are employed to releasably secure the terminal portions of elongated members such as electrical conductors to a workpiece or to each other. More specifically, it relates to a threaded terminal clamp having a clamping plate which teeters or tilts in order to accommodate and securely clamp either a single wire or two wires of the same or different size and in the case of a pair of wires to apply approximately equal clamping loads to each wire.
  • inventive concepts set forth herein can be readily adapted to cope with equal-load clamping problems associated with elongated members in general, as those skilled in the art will recognize in the light of the present disclosure.
  • clamps which must be readily releasable, yet highly secure when fastening either one or two wires, including pairs of wires of different diameters.
  • Some of the prior art terminal clamps have been specifically designed to have the versatility of accommodating a plurality of electrical wires having different diameters but approximately equal clamping loads.
  • Various approaches include, for example, clamping plates which teeter or rock relative to the shank axis. To permit such teetering the aperture in the plate may be oversized or, at least, elongated in a direction generally perpendicular to the axis of the wires being accommodated.
  • Another problem which the piror art has attempted to solve is the inconvenience and cost of assembling the clamping devices on the threaded fasteners at the job site, particularly when the terminal clamps are very small in size and require a high degree of finger dexterity to install.
  • a related problem arises when removing or unclampng the terminal clamp to temporarily release, remove or replace the wires.
  • the clamping plate may fall off the shank or even stick or otherwise remain attached to the wires which were clamped thereby.
  • terminal clamps have been fabricated with retaining shoulders or rings integrally formed on the shank itself. These retain the clamping plates on the shank so that the electrician has a preassembled device available for use. lnaddition, the shoulder positively lifts the plates from the wires as the shank is unthreaded.
  • Prior art devices employing shoulders on the threaded shanks, although not necessarily for retaining terminal clamps, include, for example, U.S. Pat. Nos. 2,192,322, 3,141,722, 3,205,473, 3,372,366 and 3,398,393.
  • Prior art teeter terminal clamps have suffered from one or more shortcomings. For example, some have been unduly complex, comprise a number of parts, are difficult to assemble or use or are quite costly to manufacture. Some have to be assembled on the job or require a nimble-fingered person to apply. Some are structurally weakened by virtue of the particular configuration required for the clamping function.
  • the captured peak-type terminal clamp wherein the threads or retaining collar are rolled on or otherwise added to the shank after assembly of the plate'thereon, also have the additional disadvantage of an undesirably large space or gap along the shank between the undersurface of the head and the beginning of the threaded portion or collar.
  • a teeter terminal clamp comprising a threaded shank having a head configured to receive a tool for rotating the shank and an apertured clamping plate loosely and teeterably assembled and retained on the shank adjacent the head.
  • the head has an underhead surface with at least one, integrally-formed, substantially-circular or oval protrusion, preferably generally V-shaped in cross sectional configuration, concentric with the shank axis and intermediate the inner and outer extremities of the underhead surface.
  • the clamping plate which is preferably generally rectilinear, has on one side thereof at least one complementary substantially-circular or oval recess, also preferably V-shaped, but of larger diameter or larger major or minor axes.
  • the sizes of the protrusion and recess are coordinated so that the extremity of the protrusion registers with the inner wall of the recess intermediate the outer and inner margins thereof.
  • the clamping plate on the other side also has wire-engaging, anti-slip surface irregularities, such as grooves or embossmerits, portions of which are at least in part transverse to the axes of the wires being retained.
  • the clamping plate is retained on the threaded shank adjacent the head by an integrally-formed annular collar.
  • the collar may be formed as disclosed, for example, in applicants copending application Ser. No. 222,532, filed Feb. I, 1972.
  • the present invention lends itself to a variety of embodiments. Some of these embodiments are specifically adapted to meet particular needs.
  • the term substantially circular is intended to encompass elongated or oval configurations as well. The concept is manifestly applicable to such alternative configurations, as those skilled in the art will recognize in the light of this disclosure.
  • FIG. I is a fragmentary elevation view, partly in section, showing on a magnified scale a preferred embodiment of the teeter terminal clamp of'the present invention prior to threading it into a workpiece for clamping purposes;
  • FIG. 2 is similar to FIG. 1 except that it shows the teeter terminal clamp after being threaded into a workpiece for clamping two conductors of different diameters;
  • FIG. 3 is an elevation view, on a slightly reduce scale as compared with FIGS. 1 and 2, of the headed blank prior to assembling the clamping plate and rolling the threads and retaining collar thereon;
  • FIG. 4 is a bottom plan view of the blank shown in FIG. 3;
  • FIG. 5 is a perspective view on an enlarged scale of the clamping plate of the embodiment of the present invention shown in FIG. 1;
  • FIG. 6 is an overhead plan view of the clamping plate of FIG. 5;
  • FIG. 7 is a sectional vie w along the line 77 of FIG.
  • FIG. 8 is a corner or diagonal view showng the side of the plate of FIG. 6 in the same general direction as in FIG. 7;
  • FIG. 9 is a front elevation view of the plate of FIG.
  • FIG. 10 is a sectional view along the line 10 10 of FIG. 6;
  • FIG. 11 is a bottom plan view of the plate of FIG. 6;
  • FIG. 12 is an elevation view, partly in section, showing on a magnified scale another embodiment prior to tightening the threaded shank in a workpiece;
  • FIG. 13 is similar to FIG. 12 and shows the disposition of the components after tightening of the threaded shank
  • FIG. 14 is a sectional view along the line l4l4 of FIG. 12.
  • FIG. 15 is a sectional view along the line 15-15 of FIG. 12.
  • the teeter terminal clamp of the present invention comprises shank 10 having threads 12 along at least a portion of the length thereof and generally circular head 14 at the upper terminal end as viewed in FIG. 1.
  • Head 14 is slotted, as indicated by slot 16, to receive the blade of the screwdriver for rotation of the shank whereby the clamp may be tightened or loosened.
  • Clamping plate 18 is loosely and teeterably assembled on shank 10 adjacent the undersurface 20 of head 14 by means of retaining collar 22.
  • the undersurface 20 of head 14 and the contacting upper surface of clamping plate 18 are complementarily designed, as described in detail hereinafter, so as to clamp terminal ends of conductors having different diameters, such as electrical leads 24 and 26 which are being clamped to workpiece 28 in support structure 30. Despite the difference in diameters of leads 24 and 26, the clamping loads on these leads are substantially identical.
  • underhead surface 20 has at least one, integrally-formed, substantially circular and generally V-shaped protrusion 32 concentric with the axis of shank l0 and intermediate the inner and outer extremities of underhead surface 20, that is, between the juncture of the shank with the underhead surface and the outer edge thereof.
  • this protrusion registers with a generally V- shaped, substantially circular recess in clamping plate 18 whereby the geometry is such that the clamping plate self-adjusts or tilts to accommodate a single conductor lead or conductor leads of'different diameters as protrayed in FIG. 2.
  • the clamp also will accommodate two leads having the same diameter.
  • clamping plate 18 has a generally V-shaped, substantially circular recess 34 formed on the upper surface 36 thereof concentric with the aperture defined by wall 38, which is centrally located relative to side walls 40, 41, 42 and 43.
  • the aperture defined by wall 38 may be circular or oblong with major and minor axes. It is oversized relative to the shank so that plate 18 can teeter, rock or tilt relative to shank 10, and thus accommodate wires of different diameters.
  • the minimum diameter or axis of aperture 38 is, however, less than the maximum diameter of collar 22 whereby plate 18 is retained on the shank adjacent the head 14 by collar 22.
  • the distance between the undersurface 20 of head 14 and collar 22, relative to the height or thickness of plate 18 is coordinated with the other variables so as not to restrict the desired degree of tiltability of plate 18.
  • protrusion 32 and recess 34 are concentrically aligned with the axis of the shank and in contact, as portrayed in FIG. 1, the lower extremity of protrusion 32 registers with the inner wall of recess 34 between the upper and lower edges thereof.
  • the lower surface of the clamp contacts the leads and, if uneven, tilts in a fashion whereby protrusion 32 is caused to slip or slide down further into recess 34 on the high side and to ride upon the upper surface 36 of plate 18 on the low side. This action continues until the lower surfaces 52 of plate 18 (or embossments thereon) contact both leads. Further tightening applies approximately equal loads to the leads.
  • the lower surface 52 of clamping plate 18 has wireengaging, anti-slip surface irregularities or embossments 44, 45, 46, 47, 48, 49, 50 and 51 thereon which frictionally grip or otherwise imbed themselves into the wires to be clamped, thereby preventing the wires from being pulled out or shaken loose accidentally.
  • the clamping action does not injure or materially reduce the current-carrying capacity of the leads.
  • These irregularites or embossments are formed by stamping or otherwise forming complementary grooves 56, 58, 60, 62, 64, 66, 68 and 70 in the upper surface 36 of plate 18.
  • the upper surface portions 72, 74, 76 and 78 adjacent the four corners of plate 18 are stamped or otherwise formed so as to direct the corners down-wardly, producing downward extremities 80, 82, 84 and 86, respectively.
  • the lower surface 52 also has a generally circular protrusion 88 intersecting the embossments 44-51, which also assists in gripping the wires or leads to be clamped.
  • Protrusion 88 is generally opposite recess 34 and is preferably formed from the metal displaced to form the latter. It should be noted that in all instances the wire-gripping protrusions or embossments 44-51 are disposed so that in the normal clamping operation, at least one and normally two, embossments are at right angles to the axes of the leads being clamped. This disposition maximizes the anti-pullout characteristic.
  • the underface or bottom of plate 18 adjacent the aperture may optionally be debossed to produce the frustoconical configuration illustrated by the dashed lines 53 in FIG. 10. This aids in the feeding of the plate prior to assembly thereof under certain circumstances.
  • the teeter terminal clamp comprises shank having threads 102 along at least a portion of the length thereof and generally circular head 104 having a slot 106 therein to receive the blade of a screwdriver.
  • U- shaped clamping plate 107 is loosely and teeterably assembled on shank 100 adjacent the undersurface of head 104. It has depending walls 108 and 109 and intermediate portion 110 with a centrally located aperture defined by wall 111.
  • undersurface of head 104 and the contacting upper surface of U-shaped clamping plate 107 are complementarily designed to achieve the desired equal clamping characteristics. Thus, regardless of any difference in diameter of conductor leads 112 and 114, they are clamped against threaded plate or nut 116 with substantially equal force.
  • the undersurface of clamping plate 107 has surface irregularities, e.g., protrusions with intermediate recesses, as best viewed in FIG. 15, which are designed to aid in the coining or forming of the clamping plate and also impart anti-skid or anti-slip features to retain wire leads 112 and 114. They thus prevent the wire leads from being pulled out or shaken out accidentally without materially reducing the current-carrying capacity thereof.
  • surface irregularities e.g., protrusions with intermediate recesses, as best viewed in FIG. 15, which are designed to aid in the coining or forming of the clamping plate and also impart anti-skid or anti-slip features to retain wire leads 112 and 114. They thus prevent the wire leads from being pulled out or shaken out accidentally without materially reducing the current-carrying capacity thereof.
  • the outer of surface protrusions 126 and 128 has terminal portions 130, 132, 134 and 136 which are disposed at right angles to the normal disposition of the axes of the leads being clamped, thus maximizing anti-pullout characteristics.
  • the embossed recesses, ridges, coinings, and/or formed members have the additional advantage of adding beam strength to the clamp so that more screw tension is permissible than would be the case if the structure were not subjected to such metal forming operations.
  • a teeter terminal clamp was fabricated substantially in accordance with the embodiment of FIGS. 1-11 from heat-treatable zinc or cadmium-coated steel, the screw size being No. 6 with 32 threads per inch and a shank length of five-sixteenths inch.
  • the resulting clamp was tested for torque, secureness and pullout characteristics, using both solid and stranded copper wire of various sizes, alone and in combination, in accordance with the requirements of Underwriters Laboratories Standard 486.
  • the torque tests were made 2.
  • the clamp of claim 1 wherein said means for retaining said plate comprises an integrally formed annular collar spaced from said head sufficiently to accommodate said clamping plate in loose relationship prior using a special fixture adapted for same and stock PT to tightening.
  • the clamp of claim 3 wherein said plate has at following table: 10 least two opposed appendages extending from margins Torque tests Wire under pressure Torque at plate (Awg.) failure Mode of failure secureness load Pullout load #12 solid 22 in. lbs Screw fractured at top of neck... 5 lbs. for 2 hrs... 70 lbs. for 1 minute.
  • a teeter terminal clamp for removably securing the terminal portion of at least one conductor comprising in combination:
  • a threaded shank having a head at one extremity and an entering end portion at the other extremity, said head being configured to cooperate with a tool whereby the shank may be rotated into or out of a threaded aperture, said head having an underhead surface having at least one, integral, substantially V-shaped, substantially-circular protrusion concentric with the shank axis and inter-mediate the inner and outer extremities of the underhead surface;
  • a clamping plate substantially centrally apertured to loosely and teeterably receive said shank, said plate having on one side thereof at least one substantially V-shaped, substantially circular recess complementing said V-shaped protrusion but having a larger diameter whereby the extremity of said V-shaped protrusion registers with the inner wall of said recess intermediate the two extremities thereof when said protrusion and said recess are concentrically aligned, said plate having wireengaging, anti-slip surface irregularities on the opposite side thereof; and
  • wire-engaging, anti-slip surface irregularities comprise grooves having at least portions disposed to intersect the wire being clamped substantially transversely.
  • wire-engaging, anti-slip surface irregularities comprise embossments disposed to intersect at least a portion of the wire being clamped substantially transversely.
  • wire-engaging, anti-slip surface irregularities comprise intersecting embossments spacedly adjacent each of the four corners of the clamping plate substantially perpendicular to the sides thereof.
  • the clamp of claim 1 including a plurality of said protrusions on the underhead surface in spaced concentric relationship and a plurality of complementary recesses in spaced concentric relationship on said plate.
  • a terminal clamp for removably securing and providing substantially identical loads to wires of the same or differing diameters in the secured position, said clamp comprising in combination:
  • a threaded shank having a head at one extremity and an entering end portion at the other extremity, said head being configured to accommodate a tool for rotation of the threaded shank, said head having an underhead surface having at least one integral, substantially-circular protrusion surrounding said shank intermediate the inner and outer extremity, said shank having an annular collar adjacent but spaced from said underhead surface;
  • a substantially rectilinear clamping plate having a substantially centrally-disposed aperture, said clamping plate being loosely and tiltably assembled on said shank between said head and said annular collar, said plate having on the surface adjacent said head at least one substantially circular recess complementing in cross section the configuration -of said protrusion but having a larger diameter whereby the extremity of .said protrusion registers being inclined away from said head.

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  • Connections By Means Of Piercing Elements, Nuts, Or Screws (AREA)
US00241581A 1972-04-06 1972-04-06 Teeter terminal clamp Expired - Lifetime US3744012A (en)

Applications Claiming Priority (1)

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US24158172A 1972-04-06 1972-04-06

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JP (1) JPS4915978A ( )
DE (1) DE2313392A1 ( )
FR (1) FR2179723B3 ( )
IT (1) IT978846B ( )

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3891296A (en) * 1973-10-09 1975-06-24 Elco Industries Inc Teeter terminal clamp
JPS51117182U ( ) * 1975-03-18 1976-09-22
US3993397A (en) * 1975-07-31 1976-11-23 Gutshall Charles E Tilting terminal clamp assembly
US4097112A (en) * 1976-09-02 1978-06-27 Howard S. Langdon Tilting terminal clamp assembly
FR2428926A1 (fr) * 1978-06-12 1980-01-11 Pfisterer Elektrotech Karl Borne de derivation pour conducteurs pilotes d'un cable de distribution
EP0736145A1 (en) * 1993-11-22 1996-10-09 E. Grant Swick Electrical connection terminal assembly and tilt washer
US6082942A (en) * 1993-11-22 2000-07-04 Swick; E. Grant Electrical connection terminal assembly and tilt washer
EP0766014B1 (en) * 1995-09-26 2001-08-29 Shimano Inc. Bicycle with cable fixing plate
US20110158768A1 (en) * 2008-08-26 2011-06-30 Ruia Global Fasteners Ag Washer, Screw or Nut with Increased Coefficient of Friction
CN103594825A (zh) * 2013-11-06 2014-02-19 国网上海市电力公司 一种双c型弹性接线装置
US20150064989A1 (en) * 2013-09-03 2015-03-05 Yazaki Corporation Connection structure for screw clamp terminal
US20170176694A1 (en) * 2015-12-18 2017-06-22 US Conec, Ltd Fiber Optic Ferrule and A Guide Pin Clamp with Field Changeable Guide Pins

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3982115A (en) * 1975-01-31 1976-09-21 Tektronix, Inc. Electronically programmable function generator
US4492422A (en) * 1982-12-10 1985-01-08 Textron Inc. Wire clamp assembly
DE102013219364A1 (de) * 2013-09-26 2015-04-09 Siemens Aktiengesellschaft Elektrische Schraubanschlussanordnung für den Anschluss von elektrischen Leitern

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3002173A (en) * 1957-06-25 1961-09-26 Gen Electric Electrical connection
US3372366A (en) * 1966-10-24 1968-03-05 Fastron Co Fastening device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3002173A (en) * 1957-06-25 1961-09-26 Gen Electric Electrical connection
US3372366A (en) * 1966-10-24 1968-03-05 Fastron Co Fastening device

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3891296A (en) * 1973-10-09 1975-06-24 Elco Industries Inc Teeter terminal clamp
JPS51117182U ( ) * 1975-03-18 1976-09-22
JPS5513897Y2 ( ) * 1975-03-18 1980-03-28
US3993397A (en) * 1975-07-31 1976-11-23 Gutshall Charles E Tilting terminal clamp assembly
US4097112A (en) * 1976-09-02 1978-06-27 Howard S. Langdon Tilting terminal clamp assembly
FR2428926A1 (fr) * 1978-06-12 1980-01-11 Pfisterer Elektrotech Karl Borne de derivation pour conducteurs pilotes d'un cable de distribution
EP0736145A1 (en) * 1993-11-22 1996-10-09 E. Grant Swick Electrical connection terminal assembly and tilt washer
EP0736145A4 (en) * 1993-11-22 1997-08-06 E Grant Swick ELECTRICAL CONNECTION TERMINAL AND TILTING WASHER ASSEMBLY
US5827028A (en) * 1993-11-22 1998-10-27 Swick; E. Grant Electrical connection terminal assembly and tilt washer
US6082942A (en) * 1993-11-22 2000-07-04 Swick; E. Grant Electrical connection terminal assembly and tilt washer
EP0766014B1 (en) * 1995-09-26 2001-08-29 Shimano Inc. Bicycle with cable fixing plate
US20110158768A1 (en) * 2008-08-26 2011-06-30 Ruia Global Fasteners Ag Washer, Screw or Nut with Increased Coefficient of Friction
US9091287B2 (en) * 2008-08-26 2015-07-28 Ruia Global Fasteners Ag Washer, screw or nut with increased coefficient of friction
US20150064989A1 (en) * 2013-09-03 2015-03-05 Yazaki Corporation Connection structure for screw clamp terminal
CN104425913A (zh) * 2013-09-03 2015-03-18 矢崎总业株式会社 螺丝紧固端子的连接构造
CN103594825A (zh) * 2013-11-06 2014-02-19 国网上海市电力公司 一种双c型弹性接线装置
CN103594825B (zh) * 2013-11-06 2015-11-18 国网上海市电力公司 一种双c型弹性接线装置
US20170176694A1 (en) * 2015-12-18 2017-06-22 US Conec, Ltd Fiber Optic Ferrule and A Guide Pin Clamp with Field Changeable Guide Pins
US10197746B2 (en) * 2015-12-18 2019-02-05 US Conec, Ltd Fiber optic ferrule and a guide pin clamp with field changeable guide pins
US10712510B2 (en) 2015-12-18 2020-07-14 US Conec, Ltd Fiber optic ferrule and a guide pin clamp with field changeable guide pins
US11327249B2 (en) * 2015-12-18 2022-05-10 Us Conec, Ltd. Fiber optic ferrule and a guide pin clamp with field changeable guide pins
US11635574B2 (en) 2015-12-18 2023-04-25 Us Conec Ltd. Fiber optic ferrule and a guide pin clamp with field changeable guide pins
US12117657B2 (en) 2015-12-18 2024-10-15 Us Conec Ltd. Fiber optic ferrule and a guide pin clamp with field changeable guide pins

Also Published As

Publication number Publication date
DE2313392A1 (de) 1973-10-18
FR2179723A1 ( ) 1973-11-23
FR2179723B3 ( ) 1976-02-13
JPS4915978A ( ) 1974-02-12
IT978846B (it) 1974-09-20

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