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Publication numberUS2986621 A
Publication typeGrant
Publication dateMay 30, 1961
Filing dateMay 5, 1959
Priority dateMay 9, 1958
Publication numberUS 2986621 A, US 2986621A, US-A-2986621, US2986621 A, US2986621A
InventorsMidgley Frank
Original AssigneeMidgley Frank
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Switch contact assemblies
US 2986621 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

May 30, 1961 F. MIDGLEY swrrcn CONTACT ASSEMBLIES Filed May 5, 1959 United States Patent Office SWITCH CONTACT ASSEMBLIES Frank Midgley, Tintern Court, St. Georges Hill, Weybridge, England Filed May 5, 1959, Ser. No. 811,145

Claims priority, application Great Britain May 9, 1958 4 Claims. (Cl. 200-166) This invention relates to switch contact assemblies of the kind wherein the switch contacts in the form of resilient strips are located between layers of electrically insulated material which are clamped together, and has been devised with a view to expediting and facilitating the fabrication of such assemblies.

According to the present invention, in a switch contact assembly of this kind each insulating layer is formed on one side with a series of projections and on the other side with a series of complementary recesses, the contact strips being shaped so as to be positively located between adjacent projections in the same layer.

Conveniently and in a preferred form of the invention, which is illustrated in the accompanying part fragmentary perspective drawing, each insulating layer 1 is formed with a series of longitudinally arranged perforations 2 adapted to receive bolts 3 for clamping a number of such layers together. Each such perforation, which extends through the layer, is encircled on one side of the latter by a projecting annulus 4 and on the other side by a complementary recess 5 and when a plurality of the layers are stacked upon one another these projections 4 and recesses 5 are engaged with one another to lock the assembly together.

The switch contact strips 6 have arcuate or semicircular indentations 7 in their respective side edges and these indentations engage respectively with two adjacent annular projections 4 in the same layer so that the contact strip 6 is positively located. The thickness of the con tact strips 6 is less than the depth of the annular projections or recesses so that when the layers are stacked upon one another and clamped together by means of bolts 3, or the equivalent, passed through some or each of the aligned perforations, the contact strips are firmly held between adjacent layers 1.

The topmost insulating layer 8 is not formed with projections and recesses like the others but instead has openings 9 which can slide upon the annular projections 4 of the adjacent insulating layer. The drawing also shows a washer 10 which threads on the bolt and is clamped against the top layer 8 by a nut 11.

By use of insulating layers and metallic contact strips as above described, banks of switch contacts may easily and quickly be fabricated to suit any particular switching circuit requirements, whilst ensuring that the contact strips are positively held in their required positions.

I claim:

1. Switch contact assembly comprising a plurality of contact strips disposed between layers of insulating material, each of said insulating layers being formed on one side with a plurality of circular projections, and on the 2,986,621 Patented May 30, 1961 other side with a plurality of complementary recesses, and each of said contact strips having part circular notches in their side edges which engage respectively with two of said circular projections which are disposed adjacent to one another in the same insulating layer whereby the contact strips in the assembly are positively located in alignment with one another by the circular projections on said insulating layers.

2. Switch contact assembly comprising a plurality of contact strips interleaved between layers of insulating material, each of said insulating layers being provided with a plurality of apertures, and being formed on one side with a plurality of annular projections surrounding said apertures, and on the other side with a plurality of complementary recesses, and each of said contact strips having part circular notches in their side edges engaging respectively with two of said annular projections which are disposed adjacent to one another in the same insulating layer whereby the contact strips in the assembly are positively located in alignment with one another by the annular projections on said insulating layers.

3. Switch contact assembly comprising a plurality of contact strips interleaved between layers of insulating material, each of said layers being provided with a plurality of apertures for receiving clamping members for securing the insulating layers together, and being formed on one side with a plurality of annular projections surrounding said apertures, and on the other side with a plurality of complementary recesses, and each of said contact strips having part circular notches in their side edges engaging respectively with two of said annular projections which are disposed adjacent to one another in the same insulating layer whereby the contact strips in the assembly are positively located in alignment with one another by the annular projections on said insulating layers.

4. Switch contact assembly comprising a plurality of contact strips interleaved between layers of insulating material, each of said insulating layers being provided with a plurality of apertures and being formed on one side with a plurality of annular projections surrounding said apertures, and on the other side with a plurality of complementary recesses also surrounding said apertures, a plurality of clamping bolts passing through said apertures for securing said insulating layers and said contact strips together into an assembly, and each of said contact strips having semi-circular notches in their side edges engaging respectively with two of said annular projections which are disposed adjacent to one another in the same insulating layer whereby the contact strips in the assembly are positively located in alignment with one another by the annular projections on said insulating layers.

References Cited in the file of this patent UNITED STATES PATENTS 2,500,413 Horlacher Mar. 14, 1950 2,575,806 Graybill et a1. Nov. 21, 1951 2,765,381 Smith Oct. 2, 1956 2,838,631 Hufnagel June 10, 1958 FOREIGN PATENTS 692,074 Germany June 12, 1940 58,807 Netherlands Ian. 15, 1947 1,134,894 France Dec. 10, 1956

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2500413 *Nov 26, 1945Mar 14, 1950Clare & Co C PGang relay switch arrangement
US2575806 *Feb 16, 1950Nov 20, 1951Automatic Elect LabContact bank for 25-point 10-wiper rotary switches
US2765381 *Mar 25, 1955Oct 2, 1956Siemens Brothers & Co LtdContact spring assemblies
US2838631 *Feb 1, 1955Jun 10, 1958Westinghouse Air Brake CoElectrical relays
DE692074C *Nov 17, 1937Jun 12, 1940Dietz & Ritter G M B H DrElektrische Kontaktleiste
FR1134894A * Title not available
NL58807C * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3126466 *Feb 26, 1962Mar 24, 1964 Modular leaf switch
US3223809 *Nov 4, 1963Dec 14, 1965Portage Electric Prod IncMounting contact strip means for thermostatic switches
US3226508 *Nov 14, 1962Dec 28, 1965Electronic Controls IncElectrical switch device
US3252206 *Jul 9, 1962May 24, 1966Molding Engineers IncMethod of molding and forming a switch device
US3548366 *Aug 16, 1967Dec 15, 1970Thomas & Betts CorpModular terminal connector block
US3573414 *Apr 14, 1969Apr 6, 1971Western Electric CoSwitch pile-ups
US4154499 *Jun 9, 1977May 15, 1979Weber Franz KElectrical connector and method of making
US4366527 *Mar 27, 1980Dec 28, 1982Ferranti LimitedCircuit assemblies each with a connector having an insulating block with two separable stacked parts
US4806104 *Feb 9, 1988Feb 21, 1989Itt CorporationHigh density connector
US5057026 *Feb 16, 1990Oct 15, 1991Yazaki CorporationElectric junction box
DE1515640B1 *Jun 5, 1962Jan 7, 1971Electronic Controls IncMehrfachkompaktschalter oder Relais
WO2008107765A1 *Feb 25, 2008Sep 12, 2008Giachetti Loris S.R.L.Electrical connection equipment
Classifications
U.S. Classification200/272, 200/DIG.460, 200/283, 335/135, 439/714
International ClassificationH01H50/56, H01H63/06
Cooperative ClassificationY10S200/46, H01H50/56, H01H63/06
European ClassificationH01H50/56, H01H63/06