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Publication numberUS2248675 A
Publication typeGrant
Publication dateJul 8, 1941
Filing dateOct 24, 1939
Priority dateOct 24, 1939
Publication numberUS 2248675 A, US 2248675A, US-A-2248675, US2248675 A, US2248675A
InventorsWilliam Huppert
Original AssigneeWilliam Huppert
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Multiple finger electrical contact and method of making the same
US 2248675 A
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Description  (OCR text may contain errors)

w. HUPPERT 2,248,675

MULTIPLE FINGER ELECTRICAL CONTACT AND METHOD OF MAKING THE SAME July 8, 1941.

Filed Oct; 24, 1939 INVENTOR w/fiawr Hufifier'f.

BY v

, ATTORNEY Patented July 8 1941 IVIULTIPLE FINGER ELECTRICAL CONTACT AND METHOD OF MAKING THE. SAME William Huppert, New York, N. Y. I Application October- 24, 1939, Serial No. 300,939

8 Claims.

This invention relates to a multiple finger electrical contact and method of making the same, and more particularly to contacts for use in multiple outlets adapted to receive two or more plugs for making connection with various electrical attachments or appliances.

A form of such multiple outlet is shown and described in my Patent No. 1,818,804 of August 11, 1931. That outlet contains two contact members each having a terminal connected to one of the feed lines and each having two or more diverging resilient contact fingers for making connection with the prongs of the plugs. One of the fingers makes contact with a prong of one plug and the other makes contact with a prong of another plug, both on the same side of the feed line.

Heretofore such multiple contacts have generally been made of two or more pieces of conductor metal riveted or otherwise secured together. This has materially increased the cost of production.

It has also been proposed to make single piece contacts by stamping them from a fiat blank of conductor metal with the contact fingers disposed in angular relation to each other, the portion of the blank between the fingers being cut out. However, this manner of manufacture is objectionable since it results in an excessive waste of material.

One of the objects of this invention is to produce one piece multiple finger contacts of the character described with a minimum waste of material. Another object isto provide multiple finger contacts having integral terminal portions, made of a single piece of metal, of simplified construction, and which are inexpensive to manufacture.

A further object is to provide a novel method of bending the blanks into shape whereby the contact fingers, originally stamped out in parallel relation, are spread apart in the required angular relation to fit properly into the outlet casing.

A-feature of the invention is that the arrangement of the terminal and finger portions of the contacts is such that the height of the outlet casing with which they are used may be appreciably reduced, thus efiecting an economy in cost of the completed outlet.

The foregoing, as well as other novel features of the invention, will appear more fully from the following description thereof, reference being had to the accompanying drawing, in which- Figure 1 is a face view of a fiat blank for a two finger contact;

Fig. 2 is a perspective view of the contact in an intermediate step in the process of its formation; Fig. 3 is a perspective View of the completed contact;

Fig. 4 is a bottom view of a multiple outlet with the insulating disk partly broken awayto show the contact in place;

Fig. 5 is a cross-section on the line 5-5 of Fig.

Fig. 6 shows a modification of the blank; and. Fig. '7 is a perspective View of a modified form of contact.

In making a two finger contact member, a blank ID of suitable shape, such for example as shown in Figure 1, is formed or stamped from a fiat strip or sheet of brass, copper, or, other conductor metal. The blanks are preferably stamped out lengthwise of the metal strip or sheet so that the contact fingers will extend in the direction of the grain of the material. This provides a-construction in which the contact fingers have increased and more durable resiliency. 1 The lower portion of the blank. is divided into I two separate fingers H and I2 by a slit orcut l3 that. extends longitudinally of the blank upward to the point l4. Since the overall width of the lower portion of the blank is substantially that of thetwo separate fingers combined,practically-no material is wasted in stamping out the fingers.

The upper portion of the blank, when it has been bent to shape as shown in Figs. 2 and3, forms the terminal portion N3 of the finished contact member. A hole l6 may be formed in'the terminal portion for reception of a binding or terminal screw. I-Iowever,,other means for attachingthe feed wire to the terminal may be employed.

The terminal portion |5 is bent back out of the plane of the finger portion along a transverse line H as shown in Fig. 2. It will be noted that'the u per end Id of the dividing line l3 extends up to this line of bend. The contact fingers H and I2 may themselves eachbe doubled over-"along a transverse line l2. to provide increased resiliency: however, such bending is not essential. The side edges of the terminal portion may be bent up as seen in Figs. 2 and 3.

The final step in forming the finished contact member shown in Fig. 3 is to bend or crimp the terminal portion l5 downwardly, in an angular bend, along the longitudinal center lineywhich line is indicated by the numeral I8in Fig. '1 and is in line with slit l3. This bending operation causes the two contact fingers I l' and I2 to spread apart at an angle to each other. The relationship between this angular bend and the spread of the fingers is such that the sum of the two angles is always 180. For instance, if it is desired to spread the contact fingers at an angle of 60 then the angularity of the applied bend or crimp would be 120.

This final bending operation is an important feature of the invention as it permits of forming, without waste of material, a one piece contact member having contact fingers that diverge angularly from'each other.

In the finished form of the contact member the point of the angle between the contact fingers falls directly in the line of the front edge ll of the terminal portion [5, as seen in Fig. 3.

An outlet in which the contact members may be used is shown in Figs. 4 and 5; The outlet.

comprises a shell or casing P9 of insulating material, preferably a molded plastic. The outlet is designed to receive two standard plugs (not shown). The casing houses two contact members each seated in a recess. One feed wire is connected 'to'the terminal portion '5 of each contact by a binding screw 2| or other suitable means. The casing has apertures 22 into which the prongs of the plugs are inserted to make contact with the contact fingers l l and I2. 23 is a cover disk of insulating fibre which is held in place by a screw 24.

It will be apparent that the prongs of the plugsmay be inserted to their full extent into the openings-220i the outlet casing without interference with the terminal portions l5 of the contact members. This permits of a considerable reduction in'the height of the casing Without impairing theefiiciency'of the contact between the contactfin gers' and the prongs.

A inodific'atienof the invention is illustrated in Figs; '6 and 7 wherein is shown a contact member having three contact fingers for use in an outlet designed to accommodate three plugs. In this instance the blank 25 is formed with three contact fingers 26, 21 and Z8, and a terminal portion 29. The fingers are separated by cuts or slits 3 0 that extend upwardly to points 3|. The contact fingers may eachbe bent over on the line 32 and the terminal portion may be bent back en the line'33l "In the"fi nal bending operation, the terminal portion is bent or crimped at an angle along each of the lines i fi and 35 to separatethe twoouter contact fingers from themiddle one, as seen in Fig. 7.

The side edges of the terminal portion may be formed with sharp teeth 36 to provide a prick point contact with the feed line.

Various modifications in the construction and method of manufacture herein described may be made by those skilled in the art without departing fromthe scope of the invention as defined in the claims.

' What I claim is:

IL A method of making a one piece multiple finger electrical contact, which comprises forming froma fiat piece of conductor metal a blank having a terminal portion and a finger portion, diwding the finger portion lengthwise into a plurality of separate fingers, bending the blank transversely along a line between the terminal and finger portionsfand spreading the fingers to a desired angle by bending the terminal portion longitudinally.

V 2. A method of making a one piece multiple finger electrical contact which comprises forming from a flat piece of conductor metal a blank having a terminal portion and a finger portion, dividing the finger portion lengthwise into a plurality of separate fingers, the width of the finger portion of the blank being substantially equal to the combined widths of the separate fingers, bending the blank transversely along a line between the terminal and finger portions, and spreading the fingers to a desired angle by bending the terminal portion longitudinally.

3. A method of making a one piece multiple finger electrical contact, which comprises stamping out longitudinally from a flat piece of conductor metal a blank having a terminal portion and a finger portion, bending the blank transversely along a line between the terminal and finger portions, and spreading the fingers to a desired angle by bending the terminal portion longitudinally.

4. A method of making a one piece multiple finger electrical contact, which comprises forming from a flat piece of conductor metal a blank having a terminal portion and a finger portion, dividing the finger portion lengthwise into a plurality of separate fingers, bending the blank transversely along a line between the terminal and finger portions, and spreading the fingers to a desired angle by bending the terminal portion longitudinally along a line which is a continuation of the line of separation of the fingers.

5. A method of making a one piece multiple finger electrical con-tact, which comprises forming from a flat piece of conductor metal a blank having a terminal portion and a finger portion, separating the finger portion lengthwise to form a plurality of individual fingers, bending the terminal portion back out of the plane of the finger portion, doubling over the finger portion, and spreading the fingers'by bending the terminal portion longitudinally downward at an angle.

6. A one piece multiple finger electrical contact comprising a metal blank having a terminal portion and a finger portion, the finger portion being divided longitudinally into a plurality of substantially parallel contact fingers, said contact fingers being bent downwardly from the terminal portion and spread apart at an angle to each other.

'7. A one piece multiple finger electrical contact comprising a metal blank having a terminal portion and a finger portion, the finger portion being divided longitudinally into a plurality of substantially parallel contact fingers, the contact fingers being bent downwardly from the terminal portion and spread apart at an angle to each other, the grain of the contact fingers having the same relationship to their longitudinal axes as the grain of the terminal portion has to its longitudinal axis.

8. A one piece multiple finger electrical contact comprising a metal blank having a terminal portion and a finger portion, the finger portion being divided longitudinally into a plurality of .contact fingers, said terminal portion having a transverse angular bend, the contact fingers being bent downwardly from the terminal portion and spread apart at an angle to each other, the relationship between transverse angular bend of the terminal portion and the angle that the contact fingers make with each other being such that the sum of the two angles is WILLIAM HUPPERT.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2450050 *Sep 28, 1945Sep 28, 1948Aircraft Marine Prod IncElectrical connector
US2488976 *Dec 14, 1944Nov 22, 1949William HuppertElectrical connector
US3974471 *Jul 30, 1975Aug 10, 1976Illinois Tool Works Inc.Brush contact
US4830626 *Jul 27, 1988May 16, 1989Liu Tzu ChenChristmas-tree securable extension cord
US7402064May 1, 2007Jul 22, 2008Fci Americas Technology, Inc.Electrical power contacts and connectors comprising same
US7425145May 26, 2006Sep 16, 2008Fci Americas Technology, Inc.Connectors and contacts for transmitting electrical power
US7452249 *Jun 12, 2006Nov 18, 2008Fci Americas Technology, Inc.Electrical power contacts and connectors comprising same
US7458839Feb 21, 2006Dec 2, 2008Fci Americas Technology, Inc.Electrical connectors having power contacts with alignment and/or restraining features
US7476108Oct 20, 2005Jan 13, 2009Fci Americas Technology, Inc.Electrical power connectors with cooling features
US7541135Oct 9, 2007Jun 2, 2009Fci Americas Technology, Inc.Power contact having conductive plates with curved portions contact beams and board tails
US7641500Mar 24, 2008Jan 5, 2010Fci Americas Technology, Inc.Power cable connector system
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US7726982May 4, 2007Jun 1, 2010Fci Americas Technology, Inc.Electrical connectors with air-circulation features
US7749009May 12, 2008Jul 6, 2010Fci Americas Technology, Inc.Surface-mount connector
US7762857Apr 25, 2008Jul 27, 2010Fci Americas Technology, Inc.Power connectors with contact-retention features
US7775822Oct 23, 2008Aug 17, 2010Fci Americas Technology, Inc.Electrical connectors having power contacts with alignment/or restraining features
US7862359Nov 3, 2009Jan 4, 2011Fci Americas Technology LlcElectrical power contacts and connectors comprising same
US7905731May 21, 2007Mar 15, 2011Fci Americas Technology, Inc.Electrical connector with stress-distribution features
US8062046Dec 17, 2010Nov 22, 2011Fci Americas Technology LlcElectrical power contacts and connectors comprising same
US8062051Jul 8, 2009Nov 22, 2011Fci Americas Technology LlcElectrical communication system having latching and strain relief features
US8187017Nov 2, 2011May 29, 2012Fci Americas Technology LlcElectrical power contacts and connectors comprising same
US8323049Jan 26, 2010Dec 4, 2012Fci Americas Technology LlcElectrical connector having power contacts
Classifications
U.S. Classification439/862, 428/582, 428/595, 428/596, 439/650
International ClassificationH01R25/00
Cooperative ClassificationH01R25/006
European ClassificationH01R25/00D