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Publication numberUS3559146 A
Publication typeGrant
Publication date26 Jan 1971
Filing date25 Oct 1968
Priority date25 Oct 1968
Publication numberUS 3559146 A, US 3559146A, US-A-3559146, US3559146 A, US3559146A
InventorsValtonen Rainer
Original AssigneeNokia Oy Ab
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Current supply rail arrangement and a connection plug
US 3559146 A
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Description  (OCR text may contain errors)

Jam 26, 1971 R. vggLToNEN 3,559,145

l v GIURRENT SUPPLY RAIL ARRANGENENT AND A CONNECTION PLUG Filedot. 25. 196s United States Patent Oice Patented Jan. 26, 11971 3,559,146 CURRENT SUPPLY RAIL ARRANGEMENT AND A CONNECTION PLUG Rainer Valtonen, Tapiola, Finland, assignor to i Oy Nokia AB, Helsinki, Finland Filed OctrZS, 1968, Ser. No. 770,658

Int. Cl. H01r 3/ 06 U.S. Cl. 339--14 2 Claims ABSTRACT OF THE DISCLOSURE A plug is provided with a plurality of contact fingers. The fingers are resiliently supported so as to be movable from a retracted position inside the plug body to an extended position to engage the conductors and the grounded lead of the plug. Eccentrics are supported in the plug body and are engageable with the fingers to selectively displace same. A knob is provided externally of the plug and is coupled with each of the eccentrics to simultaneously displace all of the eccentrics.

'The present invention relates to an electric current supply rail arrangement and connection plug for use therewith, particularly intended for lighting purposes and for small electrical motors, the rail being of the kind comprising a metal rail serving as a grounding lead and supporting structure and one or `more electric conductors fixed in the metal rail and insulated therefrom by one or more fastening strips of plastics material.

Such a current supply rail arrangement is suitable for display windows, exhibition rooms, laboratories etc. for conducting electric current to electrical apparatus and arrangements of small current requirements and which are attached to the wall or ceiling. The current is conducted from the supply rail by means of suitably adapted connecting plugs, which are attachable to the supply rail at any desired point along the rail.

Various supply rail constructions of this kind are known. In order to achieve a handy attachment of the current supply rail to a support it appeared heretofore to be of advantage to arrange the conductors within a hollow metal rail that serves as a supporting strucure. Such a rail must be of a very accurate shape allowing the attachment of the connecting plugs to be` made with great accuracy. In order that the connecting plugs at eachpoint make proper contact with the conductors, the plugs should be uniformly spaced from each other. In known constructions the shape of the insulating and fastening strips of plastics fitted into the metal rail has determined the distance of the conductors from each other. Because the manufacturer of plastics strips of accurate dimensions involves great difficulties it has been troublesome to ensure that the conductors be uniformly spaced from each other. p

The object of the invention is to attain a supply rail arrangement using a supporting construction of metal, which obviates the manufacturing difficulties in providing conductors which extend with sufficient accuracy at a constant distance from each other.

This object of the invention is achieved by a current supply rail of the aforesaid kind and which is characterized by the feature that the conductors are fitted in those edge portions of the plastics strip which rest against the metal rail and that the section of the strip between said edge portions is curved and resilient so as to force said edge portion to rest against the metal rail.

The advantage of the invention is that the accuracy of the mutual positions of the conductors is determined apart from the accuracy of the metal rail, and only by the exactness of the thickness of the plastics strip. In the manufacture of plastics strip it is easier to avoid variations in thickness than the variations in shape and width. By arranging the conductors in said edge portions, which rest against the metal rail when the plastic strip is mounted inside the rail, it is'possible to eliminate the influence of the variations in shape and width of the plastic strip on the mutual position of the conductors within the rail. The plastic strip can be made comparatively thin. The actual values of the variations in thickness of a thin plastic strip are insignificant. When a plastic strip fabricated according to the invention is mounted into a metal rail manufactured with sufficient exactness the object is achieved that the conductors extend with a satisfying accuracy at a constant distance from each other,

Some embodiments of the invention will tbe described with reference to the accompanying drawings, wherein:

FIG. 1 shows in section a single phase supply rail arrangement according to the invention;

FIG. 2 shows in section a three-phase supply rail arrangement;

FIGS. 3 and 4 show respectively an end-view and a Side-view of a three-phase supply rail arrangement with a connecting plug; and

FIG. 5 shows a connecting plug for a three-phase supply rail arrangement in a section taken along line A-A in FIG. 4.

FIG. 1 shows a metal rail 1 which can be made, for example, as an extruded aluminum rail, serving as a supporting element and as a protective grounding lead, together with an insulating and fastening strip 2, which can be constituted, for example, of PVC-plastics, supporting conductors 4 and 5 which can be copper wires having a circular or a fiat cross section. The curved part 10 of the plastic strip 2.is of such a length that the strip after having been mounted into position in the rail 1 is slightly stressed. The position of the conductor 4 fixed by the plastic strip 2 relative the metal rail 1 is determined by the thickness of the parts 6 and 7 of the plastic strip. Similarly, the position of the conductor 5 relative the metal rail 1 is determined by the thickness of parts 8 and 9 of the plastic strip.

FIG. 2 shows a supply rail arrangement for a three phase system. This includes in addition to -the plastic strip 2 another similar plastic strip 2' supporting conductors 11 and 12. In this case the conductors 4, 11 and 12 are coupled in a suitable way to the wires of a three-phase circuit.

In FIGS. 3 and 4 is shown a connecting plug 13 attached to a supply rail. The connecting plug 13 is provided with contact fingers 14, 15, 16 and 17 for contacting the conductors 4, S, 11 and 12. The connecting plug is further provided with contact fingers 18 and 19 for contacting the metal rail 1in order to provide a protective grounding.

FIG. 5 shows the interior of the connecting plug 1 3 seen in section along line A-A in FIG. 4. The contact finger 15, whcih is made of a comparatively hard spring materila, e.g. bronze, is attached to the body of the connecting plug by a screw 21. By the action of an eccentric 20 journalled in the body of the plug the contact finger 15 is movable relative the body of the plug between a retracted position and a projecting position. The contact linger 15 is attached by means of a screw 21 to a wire of a conductor 22, which leads to a current consuming apparatus. The other contact fingers 14, 16, 17, 118v and 19, also of spring material, are in a corresponding manner attached to the body of the connecting plug and similarly connected to corresponding wires of the conductor 22. When the connecting plug 13 is to be attached to the current supply rail, the eccentric 20 and simultaneously the other eccentrics (not shown) acting on the other contact fingers are turned by means of a knob 23 (FIGS. 3 and 4) to such a position that the contact fingers are retracted allowing the connecting plug to be easily attached to the supply rail. The various eccentrics are of such shapes that, when the connecting plug is attached to the supply rail and the knob 23 is turned to move the contact fingers 14-19 to their contacting positions, the grounding contact fingers 18 and 19 are first brought in contact with the metal rail 1 before the other contact fingers 14-17 are brought in contact with their respective conductors 4, 5, 11 and 12, in order to achieve the protective grounding of the consumer apparatus before said apparatus is connected to the circuit.

The drawings and the descriptions thereto are only intended to exemplify the idea of the invention. As to details the connecting plug and the current supply rail arrangement can, within the scope of the claims, deviate to a certain extent from the embodiments depicted.

What I claim is:

1. A connection plug for a current supply rail assembly including a metal rail, and at least one current conductor supported by said metal rail, said current supply rail constituting a grounding lead, said plug comprising a hollow body, a plurality of contact fingers resiliently supported in said hollow body, said fingers being engageable at least one with one of each of the conductors and at least another with the grounded metal rail, eccentric means engageable one with one of each of said fingers to displace said fingers respectively from a retracted position internally of said hollow body to an extended position projecting externally of said hollow body to contact respectively the conductors and the grounded metal rail, and single control means operatively associated with each of said eccentric means to simutaneously displace each of said eccentric means.

2. A connection plug as claimed in claim 1 wherein said contact fingers are each operatively associated, one with one of each of said eccentric means, such that said control means is operable to displace said eccentric means simultaneously, with the contact finger, being engageable with said grounded metal rail, contacting said metal rail before the contact finger, being engageable with the conductor, contacts the conductor.

References Cited UNITED STATES PATENTS 3,503,032 3/1970 Routh et al. 339-14 3,181,102 4/1965 Fehr 339-21 3,295,093 12/1966 Neumann et al. 339-21 MARVIN A. CHAMPION, Primary Examiner R. A. HAFER, Assistant Examiner U.S. C1. X.R.

ZOO-51.05; 339-21

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3676830 *16 Sep 197011 Jul 1972Lightolier IncMultiple access electric power distribution assembly
US3686614 *1 Feb 197122 Aug 1972Nokia Oy AbConnecting plug for a current supply rail
US3704437 *5 Jan 197128 Nov 1972Staff & Schwarz GmbhCurrent distributor rail
US3718816 *17 Jun 197127 Feb 1973Reininghaus & CoIllumination device
US3725695 *27 Oct 19713 Apr 1973Reininghaus & CoIllumination device
US3737834 *20 Sep 19715 Jun 1973Us Industries IncAdapter for three conductor electrical power distribution track
US3825879 *2 Aug 197223 Jul 1974Hesse KAdapter for current distributor rail
US3919457 *22 Apr 197411 Nov 1975Steiner SheldonElectrified suspension ceiling system
US4121879 *18 May 197724 Oct 1978Bjorn KokvikConnector arrangement for conductor rails
US4173382 *27 Oct 19776 Nov 1979Booty Donald JPortable track lighting
US4734041 *22 Jun 198729 Mar 1988Control Data CorporationElectrical power connector
US4822292 *21 Jan 198718 Apr 1989Thayer George FMultiple line circuit track lighting system and fixture mounting adapters therefore
US5855485 *16 Jan 19975 Jan 1999Patti; Anthony G.Multiple track adapter for track lighting systems
US739738411 Feb 20058 Jul 2008Genlyte Thomas Group, LlcTrack lighting system current limiting device
US750700530 Jan 200724 Mar 2009Genlyte Thomas Group LlcSliding flexible track lighting
US752076329 Jun 200721 Apr 2009Genlyte Thomas Group LlcTrack lighting system with dependent lamp cord
US77583585 May 200820 Jul 2010Koninklijke Philips Electronics N.V.Track lighting assembly
US791135126 Jun 200822 Mar 2011Genlyte Thomas Group LlcTrack lighting system current limiting device
US814402511 Feb 201127 Mar 2012Genlyte Thomas Group LlcTrack lighting system current limiting device
US814631621 Oct 20093 Apr 2012Usg Interiors, LlcElectrified ceiling grid
US831433621 Oct 200920 Nov 2012Usg Interiors, LlcSpecialty ceiling structure and functional ceiling grid
US848583521 Oct 200916 Jul 2013Usg Interiors, LlcElectrified suspended ceiling grid
Classifications
U.S. Classification439/94, 200/51.5, 439/117
International ClassificationH01R25/14, H01R25/00
Cooperative ClassificationH01R25/14
European ClassificationH01R25/14