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US3470526A - Electrical connection terminal - Google Patents

Electrical connection terminal Download PDF

Info

Publication number
US3470526A
US3470526A US603476A US60347666A US3470526A US 3470526 A US3470526 A US 3470526A US 603476 A US603476 A US 603476A US 60347666 A US60347666 A US 60347666A US 3470526 A US3470526 A US 3470526A
Authority
US
United States
Prior art keywords
clamp
screw
aperture
thread
plate
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
US603476A
Other languages
English (en)
Inventor
Jean Louis Andre Joly
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.)
Telemecanique SA
Original Assignee
La Telemecanique Electrique SA
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
Priority claimed from FR52905A external-priority patent/FR1477709A/fr
Priority claimed from FR53346A external-priority patent/FR90025E/fr
Application filed by La Telemecanique Electrique SA filed Critical La Telemecanique Electrique SA
Application granted granted Critical
Publication of US3470526A publication Critical patent/US3470526A/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
    • H01R4/28—Clamped connections, spring connections
    • H01R4/30—Clamped connections, spring connections utilising a screw or nut clamping member
    • H01R4/34—Conductive members located under head of screw
    • 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
    • H01R4/40—Pivotable clamping member

Definitions

  • terminals are constituted by a tightening screw under the head of which is arranged an arched clamp supported under the head of the screw and pressing by its concavity, when the screw is tightened, the conductors to be attached, against a conductive plate forming the end of the connection terminal.
  • connection terminal in accordance with the invention is distinguished by its simplicity. It comprises however, in addition to features of the terminals already known, some further advantages.
  • the arched clamp is in a known manner made captive of the screw by the rolling of the thread, this clamp is such that it is not possible to separate it from the screw by engaging the edge of its aperture on the threads of the screw.
  • the thread allows tightening of the screw even when the clamp is in contact with the plate.
  • the terminal plate can be flat and be provided with a simple tapped hole, and this simplifies its machining and allows tightening of straight conductors without deforming them, making possible their reemployment after loosening of the terminal.
  • the terminal in accordance with the invention comprises three parts: a body of the terminal with a tapped plate, a screw engaged in this tapping and an arched clamp made captive of this screw by the rolling of its thread, is characterized in that the tapping being started at the surface of the plate, the threaded part extends by at least one thread beyond the plane determined by the parallel edges of the clamp when its top of the arch touches the head of the screw, while this arched clamp comprises an aperture whose projection of the edge turned towards the threaded surface is a circle of a diameter only little larger than that of the screw before rolling, the said aperture being widened in the direction of the head of the screw only in the transversal direction to the arched clamp.
  • the clamp can rock about the top of the arch, in
  • the form of the aperture of the arched clamp in accordance with the present invention can be obtained when the clamp is already arched, by means of stamping for example.
  • the clamp initially in the form of a flat plate is provided, by punching, with an oval aperture, after which the plate is arched into a clamp by bending following the short axis of this oval, this closing the aperture towards the interior of the clamp and gives it a desired widened form and transforms the edge of the aperture into a skew curve inscribed on a cylinder.
  • FIG. 1 is a cross-section of the embodiment
  • FIG. 2 is a cross-section on a larger scale at right angles to the section of FIG. 1,
  • FIG. 3 is a perspective view of an arched clamp and of the corresponding plate
  • FIG. 4 is a view in plan of a fiat plate before formation into an arched clamp
  • FIG. 5 is a view in plan of a convex side of the same plate arched into a clamp
  • FIG. 6 is an elevation of an arched clamp
  • FIG. 7 is a schematic representation of the evolution of the clamp during arching.
  • FIG. 8 is a longitudinal cross-section of a double connection terminal.
  • the terminal shown in FIG. 1 comprises a body of a terminal of suitable form of which only a flat plate 1 of conducting material is shown,
  • the terminal is mounted upon a support A of insulating material and has a tapped opening 1a.
  • a screw having a portion 2 threaded by rolling and, between the thread and the head of the screw 3, a non-threaded portion 4 which passes through an aperture 5 of an arched clamp 6.
  • the aperture 5 has, on the concave side of the clamp, an edge 7 in the form of a skewed, closed outline, whose projection on a plane perpendicular to the axis of the aperture is a circle of diameter d only slightly larger (FIG. 2) than the diameter d of the portion 4 of the screw.
  • This aperture 5 is widened only in the transversal direction with regard to the arched top 9 of the clamp 6,
  • an arched clamp can be made from a fiat rectangular plate 10 provided with a punched oval-shaped aperture 11 Whose minor axis is equal to al and whose major axis is equal to somewhat greater than the major axis a of the oval corresponding to the projection of the edge 8 of the aperture 5 (FIG. 5).
  • the plate has also two chamfers 13 on the edges perpendicular to the major axis a By arching this plate transversely as shown in FIG.
  • the curve 7 projecting as a circle can be considered as being inscribed on a cylinder of diameter d approaching diameter d of the non-machined portion 4 of the screw.
  • arched clamps permit effective tightening of the straight and stripped ends of electrical conductors and that this removes the need to use clips or to form loops on the conductors.
  • the edges 16 of the clamp can touch the plate 1 before an effective tightening is obtained.
  • the rolling of the thread of the portion 2 is carried out in such manner that, the clamp'being in contact through top of the arch 9 with the head of the screw, the threaded surface extends below the clamp by at least one complete revolution.
  • N being the level of the plane determined by the two edges 6 of the clamp, when the top 9 of the arch touches the head of the screw, the threaded surface terminates at a distance h from the level N which is at least equal to a pitch of the thread 12.
  • the only parts of the edge 7 which can touch the start of the thread 12 are parts 7a and 7b which, in the direction of the thread, are convex and which, whatever the position of the clamp on the screw, are always very near the portion 4 of the screw and are positioned, during the rotation of the screw in the direction of unscrewing, tangentially to the start 12a of the thread.
  • this start cannot contact outline 7 and cut into it, and neither can edge of the edge 7 be engaged into hollow of the thread 12, which would allow the clamp to behave as a nut in relation to the screw, with all the undesirable consequences.
  • conductors 15, after tightening against the plate 1, remain practically straight and have maximum surface of contact with the terminal.
  • Construction of the clamp shown in the drawings is on either side of the aperture 5 such that it provided symmetrical bosses 18 on the convex face, and a central hollow along each of the parallel edges of the clamp.
  • the central part of the carrying surface of the clamp on a conductor 15 is thus clear, which concentrates the tightening at the two ends of this surface and improves the tightening.
  • the plate 1 may have on each side opposite to internal face of bosses 18 a small convex projection 19, this improving the carrying surface of the clamp on the plate and contributing to the prevention of rotation of the conductors and of the clamp during tightening.
  • FIG. 8 shows a practical embodiment of the invention in which a double connection terminal is used to connect two conductors.
  • the body of the terminal is a flat bar 20 whose two ends form two plates 1 provided with tapped holes 1a.
  • This bar carries, in these tappings, two screws 2 and 3 and two arched clamps 6.
  • the bar 20 is inserted against a surface 22 under the projections 21 which join two insulating plates 23.
  • the surface 22, the projections 21 and the plates 23 belong to one moulded part in insulating material, which is provided also with bore-holes 24 into which enter the screws, this holding the parts together.
  • connection terminal comprising a fixed plate having a tapped hole therethrough
  • a shank attached to said head having a raised thread beginning at a distance from said underface and a smooth portion of said shank between said thread and said head;
  • an arched clamp captive on said screw shank between said underface and the beginning of said thread and having an axial aperture with an edge of which turned towards said screw thread is a skewed, closed outline having a projection on a plane perpendicular to the axis of the aperture which is a circle of a diameter of the size between the diameter of said smooth portion of said shank and the external diameter of said raised thread, said aperture being flared in the direction of said screw head only in a transverse direction with respect to said arched clamp, and the total height of said clamp being more than the distance between said underface and said thread.
  • connection terminal in accordance with claim 1 further characterized by said clamp having straight edges with a boss on the convex face and a hollow on the concave face of said arched clamp on each of said straight edges.
  • said plate having a boss on each side of its tapped hole on one surface of said plate corresponding to said hollow on the concave face of said clamp.
  • connection terminal in accordance with claim 1 further characterized by a second screw and a second clamp having construction similar to said first mentioned screw and clamp,
  • said fixed plate having a second tapped hole therethrough to receive said second screw therethrough and said second clamp against it

Landscapes

  • Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
  • Connections By Means Of Piercing Elements, Nuts, Or Screws (AREA)
  • Multi-Conductor Connections (AREA)
US603476A 1966-03-10 1966-12-21 Electrical connection terminal Expired - Lifetime US3470526A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR52905A FR1477709A (fr) 1966-03-10 1966-03-10 Borne de connexion électrique
FR53346A FR90025E (fr) 1966-03-14 1966-03-14 Borne de connexion électrique

Publications (1)

Publication Number Publication Date
US3470526A true US3470526A (en) 1969-09-30

Family

ID=46052977

Family Applications (1)

Application Number Title Priority Date Filing Date
US603476A Expired - Lifetime US3470526A (en) 1966-03-10 1966-12-21 Electrical connection terminal

Country Status (5)

Country Link
US (1) US3470526A (ja)
BE (1) BE691909A (ja)
CH (1) CH462272A (ja)
DE (1) DE1590780A1 (ja)
GB (1) GB1154178A (ja)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4611876A (en) * 1983-12-30 1986-09-16 La Telemecanique Electrique General purpose loss-proof terminal for forming electric connections by clamping between two conducting elements
US4820206A (en) * 1987-03-05 1989-04-11 La Telemecanique Electrique Screw connection device for electric conductors
US5704816A (en) * 1995-11-20 1998-01-06 Thomas P. Polidori Hinged electrical connector
US6388216B1 (en) * 2001-02-28 2002-05-14 Eaton Corporation Terminal wire clamp
US20120192399A1 (en) * 2011-02-01 2012-08-02 Thomas & Betts International, Inc. Panel clamp
US20150280334A1 (en) * 2014-03-28 2015-10-01 Sunrun South Llc Solar panel grounding lug assemblies and systems

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2659345C2 (de) * 1976-12-29 1986-11-06 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Anschlußstück mit satteldachförmiger Anschlußscheibe
DE3149643C2 (de) * 1981-12-15 1986-07-03 Brown, Boveri & Cie Ag, 6800 Mannheim Druckscheibe für eine Klemmverbindung von elektrischen Leitern

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1979091A (en) * 1930-07-23 1934-10-30 Delta Star Electric Co Electrical distribution connecter
US2161246A (en) * 1937-12-22 1939-06-06 Trumbull Electric Mfg Co Electric terminal
US2712123A (en) * 1955-06-28 Electrical connection terminal assembly
US3081507A (en) * 1960-05-16 1963-03-19 Square D Co Connector
US3141722A (en) * 1962-05-07 1964-07-21 Square D Co Pressure wire terminal clamp with self-retained wire clamp
US3238495A (en) * 1964-04-17 1966-03-01 Illinois Tool Works Electrical connector
US3372366A (en) * 1966-10-24 1968-03-05 Fastron Co Fastening device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2712123A (en) * 1955-06-28 Electrical connection terminal assembly
US1979091A (en) * 1930-07-23 1934-10-30 Delta Star Electric Co Electrical distribution connecter
US2161246A (en) * 1937-12-22 1939-06-06 Trumbull Electric Mfg Co Electric terminal
US3081507A (en) * 1960-05-16 1963-03-19 Square D Co Connector
US3141722A (en) * 1962-05-07 1964-07-21 Square D Co Pressure wire terminal clamp with self-retained wire clamp
US3238495A (en) * 1964-04-17 1966-03-01 Illinois Tool Works Electrical connector
US3372366A (en) * 1966-10-24 1968-03-05 Fastron Co Fastening device

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4611876A (en) * 1983-12-30 1986-09-16 La Telemecanique Electrique General purpose loss-proof terminal for forming electric connections by clamping between two conducting elements
US4820206A (en) * 1987-03-05 1989-04-11 La Telemecanique Electrique Screw connection device for electric conductors
US5704816A (en) * 1995-11-20 1998-01-06 Thomas P. Polidori Hinged electrical connector
US6388216B1 (en) * 2001-02-28 2002-05-14 Eaton Corporation Terminal wire clamp
US20120192399A1 (en) * 2011-02-01 2012-08-02 Thomas & Betts International, Inc. Panel clamp
US9422957B2 (en) * 2011-02-01 2016-08-23 Thomas & Betts International Llc Panel clamp
US20150280334A1 (en) * 2014-03-28 2015-10-01 Sunrun South Llc Solar panel grounding lug assemblies and systems
US9742350B2 (en) * 2014-03-28 2017-08-22 Sunrun South Llc Solar panel grounding lug assemblies and systems

Also Published As

Publication number Publication date
CH462272A (fr) 1968-09-15
GB1154178A (en) 1969-06-04
BE691909A (ja) 1967-05-29
DE1590780A1 (de) 1970-09-24

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