US3873178A - Terminal clamp for electrical conductors - Google Patents

Terminal clamp for electrical conductors Download PDF

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Publication number
US3873178A
US3873178A US392522A US39252273A US3873178A US 3873178 A US3873178 A US 3873178A US 392522 A US392522 A US 392522A US 39252273 A US39252273 A US 39252273A US 3873178 A US3873178 A US 3873178A
Authority
US
United States
Prior art keywords
clamping
terminal clamp
clamping member
pressure plate
guide part
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
US392522A
Other languages
English (en)
Inventor
Anton Galli
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens Corp
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 Siemens Corp filed Critical Siemens Corp
Application granted granted Critical
Publication of US3873178A publication Critical patent/US3873178A/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
    • H01R4/50—Clamped connections, spring connections utilising a cam, wedge, cone or ball also combined with a screw
    • H01R4/5008—Clamped connections, spring connections utilising a cam, wedge, cone or ball also combined with a screw using rotatable cam
    • 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
    • Y10T24/3936—Pivoted part
    • Y10T24/394—Cam lever

Definitions

  • a terminal clamp for electrical conductors has a cylindrical clamping member which can be rotated in a clamping frame to clamp the conductor.
  • the conductor is inserted into a conductor insertion opening disposed beyond the cylnindrical surface of the clamping member. The opening extends in .the longitudinal direction of the clamping member.
  • the clamping surfaces of the cylindrical clamping member are eccentrically arranged in such a manner that they protrude be yond the cylinder surface of the clamping member and clamp a conductor inserted into the conductor opening against the clamping frame when the clamping member is rotated.
  • the tool which is used to rotate the clamping member is then positioned in a direction parellel to the direction in which the conductor is inserted.
  • the invention relates to a terminal clamp for electrical conductors with a cylindrical clamping member which can be rotated in a clamping frame and has eccentrically arranged clamping surfaces.
  • a terminal clamp of this type wherein there is an essentially cylindrical clamping part which is rotatably supported in the bottom opening of a cup-shaped clamping frame and has a groove which is provided on the periphery of the cylindrical clamping part. The groove receives a conductor and extends in helix-fashion around the axis of rotation and at the same time becomes narrower.
  • the direction of insertion of the conductor and the direction of applying a tool for turning the clamping part, for instance, a screw driver in the operating slot of the clamping part are therefore at right angles to each other.
  • a tool for turning the clamping part for instance, a screw driver in the operating slot of the clamping part
  • the known terminal clamp it is furthermore only possible to clamp one conductor in the eccentric groove, for instance, a contact inserted into the cup, and the conductor must fit the dimensions of the groove.
  • the cup is solid, so that a backward rotation of the eccentric cannot be pre vented reliably, particularly in the presence of vibrations or when temperature variations occur, because the conductor clamping part and the clamping frame consist of different material.
  • the eccentrically arranged clamping surfaces protrude beyond the cylinder.
  • the clamping frame has at least one conductor insertion opening disposed outside the cylinder in the longitudinal direction of the cylinder.
  • Terminal clamp of the invention includes a cylindrical clamping member having a cylindrical surface and defining a longitudinal axis.
  • a clamping frame accommodates the clamping member and defines at least one insertion opening for receiving an electrical conductor therein.
  • the opening extends in the direction of the above-mentioned longitudinal axis and is located be yond the cylindrical surface of the clamping member.
  • the clamping member is rotatably mounted in the clamping frame for clamping the conductor and has a portion which protrudes eccentrically from the cylindrical surface to define at least one clamping surface.
  • the clamping frame is resilient.
  • the manufacture of the terminal clamp according to the invention, and especially the assembly of the clamping cylinder in the clamping frame, is facilitated considerably if the clamping frame is made up of a U- shaped guide part for accommodating the clamping member and a pressure plate which closes the U and is fastened to the guide part. If the guide part and the pressure plate are hooked into each other additional assembly steps are unnecessary. The required space and material can be reduced furtherif. for instance. the guide member and the pressure plate are joined together by peening.
  • the pressure plate is notjoincd to the clamping frame rigidly, more specifically, the clamping frameitself can twist because then the pressure plate can adapt itself to the pitch of the eccentric portion of the clamping member when two conductors are connected.
  • the bearing of the clamping member is improved when the clamping frame is configured to have bent-in portions between where the clamping member is mounted and where the conductor is accommodated. These bent-in portions are particularly advantageous for the resiliency of the clamping frame and for matchingto the pitch of the eccentric portion if at least parts of the clamping frame are made of spring steel. Additional security against the conductor being pulled out is provided by a terminal clamp configuration in which the eccentrically arranged clamping surfaces around the cylindersurface are disposed at an angle to the longitudinal axis of the latter.
  • Symmetrical pressure conditions can beobtained in such a configuration when two clamping surfaces are arranged about the cylinder surface and when their respective planes intersect to define an obtuse angle. Defined contact surfaces for a conductor to be clamped and a shortening of the lift of the eccentric portion in the case of two conductors of smaller cross-section can be obtained if the pressure plate is curved away from the clamping member.
  • FIG. 1 is an elevation view of the terminal clamp according to the invention. The clamp is shown in its open position.
  • FIG. 2 shows the terminal clamp with one conductor inserted therein.
  • FIG. 3 shows the terminal clamp with two conductors inserted therein, the conductors having a cross-section less than the conductor shown in FIG. 2.
  • FIGS. 4 and 5 show respectively a plan view and an end view of the U-shaped guidance part of the clamping frame.
  • FIGS. 6 and 7 show respectively a front view and an elevation view of the pressure plate which is connected to the guidance part.
  • FIGS. Sand 9 show respectively a front view and an elevation view of the clamping member and the portion thereof defining the eccentric clampingsurfaces.
  • the clamping frame 1 of the terminal clamp includes the guide part 2 for the cylindrical clampingmember 3 having an eccentrically disposed clamping surface 4.
  • the frame 1 further includes a pressure plate 5 which is hooked into the arms 6 of the guide part 2.
  • an opening 7 is provided in the arm 6 as shown in FIG. 5, into which projections 8 of the pressure plate are hung.
  • the pressure plate 5 is, for instance, slightly curved at its center portion, as shown in FIGS. 6 and 7.
  • the clamping sur faces 4 are provided at an eccentric portion 12 formed on the cylindrical clamping member 3 which protrudes through a cutout 13 shown in FIG. 5.
  • the webs 14 between the opening 7 and the cutout l3 serve as stops for the eccentric portion 12 in the fully opened condi tion shown in FIG. 1.
  • the pitch of the eccentric portion 12 and therefore, the position of the clamping surfaces with respect to the pressure plate 5 is chosen so that self-locking takes place.
  • the U-shaped guide part is resilient and, for instance, consists of spring steel, to provide bent-in portions 15 at the arms 6 which yield if the terminal is tightened; this action connects the conductors 10 and /or 11 reliably with the contact element 9 also in the presence of temperature variations and vibration.
  • the clamping surfaces 4 can be disposed at an angle to the cylindrical surface of the clamping member 3.
  • these are two ring surfaces about the cylindrical surface which conjointly define an obtuse angle so that the conductor is readily deformed when clamped; this makes it harder to pull the conductor out of the terminal clamp in the clamped condition. Serrations can be applied to these surfaces.
  • the terminal clamp according to the invention is utilized, for instance, by inserting the conductors 10 into the open terminal clamp and the clamping member 3 is turned to the right to the position shown in FIG. 3 or, if one conductor is inserted to the position shown in FIG. 2, for example, by inserting a screw driver into the slot 16 and turning the same; this causes the bent-in portions 15 to recede slightly which in turn leads to an elastic tightening of the conductors 10 or 11 against the fixed contact 9.
  • the terminal clamp is opened by turning the clamping member 3 to the left.
  • the terminal according to the invention requires very little space and is particularly well suited for connecting to the rear contacts of the push buttons.
  • a terminal clamp for electrical conductors comprising a cylinder-like clamping member having a cylindrical surface and defining a longitudinal axis;
  • a clamping frame including a U-shaped bent guide part for accommodating said clamping member and defining at least one insertion opening for receiving an electrical conductor therein, said opening extending in the direction of said axis and being beyond said cylindrical surface.
  • said clamping frame being configured so as to have bent-in portions between where said clamping member is disposed and said insertion opening;
  • said clamping member being rotatably mounted in said clamping frame between said bent-in portions and the bight of said U-shaped guide part for clamping the electrical conductor, said clamping member having an eccentric portion protruding eccentrically from the cylindrical surface thereof to define at least one clamping surface, and
  • a pressure plate attached to said guide part so as to close the open end of said U-shaped guide part.
  • clamping surfaces defining an obtuse angle and being disposed on said eccentric portion so as to extend about said cylindrical surface.

Landscapes

  • Connections Arranged To Contact A Plurality Of Conductors (AREA)
  • Clamps And Clips (AREA)
US392522A 1972-09-04 1973-08-29 Terminal clamp for electrical conductors Expired - Lifetime US3873178A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2243454 1972-09-04

Publications (1)

Publication Number Publication Date
US3873178A true US3873178A (en) 1975-03-25

Family

ID=5855476

Family Applications (1)

Application Number Title Priority Date Filing Date
US392522A Expired - Lifetime US3873178A (en) 1972-09-04 1973-08-29 Terminal clamp for electrical conductors

Country Status (10)

Country Link
US (1) US3873178A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
JP (1) JPS4967186A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
AR (1) AR195754A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
AT (1) ATA736973A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
BR (1) BR7306801D0 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
CA (1) CA1000830A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
CH (1) CH561962A5 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE2243454C2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR (1) FR2198283B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
IT (1) IT995250B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3976353A (en) * 1974-04-04 1976-08-24 Siemens Aktiengesellschaft Terminal for electric conductors
US4029383A (en) * 1973-11-20 1977-06-14 The Post Office Electrical connectors
US5938488A (en) * 1996-08-30 1999-08-17 Weidmuller Interface Gmbh & Co. Clamping device for electrical conductors
US20050055062A1 (en) * 2003-08-05 2005-03-10 Philippe Correas Screwless system for connecting a probe to an active implantable medical device

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1537066A (en) * 1924-01-11 1925-05-12 Charles E Callendar Battery-terminal connection
US2125203A (en) * 1937-11-08 1938-07-26 Orville L Schanbacher Battery post clamp
US2314219A (en) * 1942-02-14 1943-03-16 Erick G Johnson Battery clamp
US2698424A (en) * 1952-05-13 1954-12-28 Paul M Allen Battery terminal
US2763847A (en) * 1952-01-24 1956-09-18 Hubbell Inc Harvey Cam clamp for back wiring connection
US2816155A (en) * 1955-04-19 1957-12-10 Robert I Barnes Insulator clamp

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1215793B (de) * 1962-01-12 1966-05-05 Elektrotechnischer Spezialarti Klemmvorrichtung zum Festklemmen eines blanken Leiters an eine Kontaktflaeche

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1537066A (en) * 1924-01-11 1925-05-12 Charles E Callendar Battery-terminal connection
US2125203A (en) * 1937-11-08 1938-07-26 Orville L Schanbacher Battery post clamp
US2314219A (en) * 1942-02-14 1943-03-16 Erick G Johnson Battery clamp
US2763847A (en) * 1952-01-24 1956-09-18 Hubbell Inc Harvey Cam clamp for back wiring connection
US2698424A (en) * 1952-05-13 1954-12-28 Paul M Allen Battery terminal
US2816155A (en) * 1955-04-19 1957-12-10 Robert I Barnes Insulator clamp

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4029383A (en) * 1973-11-20 1977-06-14 The Post Office Electrical connectors
US3976353A (en) * 1974-04-04 1976-08-24 Siemens Aktiengesellschaft Terminal for electric conductors
US5938488A (en) * 1996-08-30 1999-08-17 Weidmuller Interface Gmbh & Co. Clamping device for electrical conductors
US20050055062A1 (en) * 2003-08-05 2005-03-10 Philippe Correas Screwless system for connecting a probe to an active implantable medical device

Also Published As

Publication number Publication date
FR2198283B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1977-09-09
DE2243454B1 (de) 1973-09-27
FR2198283A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1974-03-29
DE2243454C2 (de) 1974-04-25
IT995250B (it) 1975-11-10
AR195754A1 (es) 1973-10-31
CH561962A5 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1975-05-15
BR7306801D0 (pt) 1974-07-11
ATA736973A (de) 1977-01-15
CA1000830A (en) 1976-11-30
JPS4967186A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1974-06-28

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