US2994849A - Electrical plug-in connector - Google Patents

Electrical plug-in connector Download PDF

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US2994849A
US2994849A US705200A US70520057A US2994849A US 2994849 A US2994849 A US 2994849A US 705200 A US705200 A US 705200A US 70520057 A US70520057 A US 70520057A US 2994849 A US2994849 A US 2994849A
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prong
connector
plug
conductors
prongs
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US705200A
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Jr Joseph Mussari
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/648—Protective earth or shield arrangements on coupling devices, e.g. anti-static shielding  
    • H01R13/652—Protective earth or shield arrangements on coupling devices, e.g. anti-static shielding   with earth pin, blade or socket
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R31/00—Coupling parts supported only by co-operation with counterpart
    • H01R31/02—Intermediate parts for distributing energy to two or more circuits in parallel, e.g. splitter

Definitions

  • the present invention relates to a plug-in connector suitable for use with a convenience outlet in the threewire system described supra, and has as an object the safe provision of electrical energy at the potential difference existing between the neutral and either of the hot wires and also, if it is so desired, at the potential difference existing between the two hot wires.
  • the invention resides in the combination of elements and arrangement of parts as hereinafter described and illustrated.
  • FIGURE 1 is an exterior perspective view of one em bodiment of the invention
  • FIGURE 2 is an exterior perspective view of the same embodiment of the invention but viewed from the opposite end and with the device rotated one hundred eighty degrees (180") about its longitudinal axis; and
  • FIGURE 3 is a diagrammatic sketch illustrating the electrical conductor arrangement of the embodiment of the invention illustrated in FIGURE 1 and FIGURE 2.
  • FIGURE 1 there is illustrated an embodiment of the invention in which the body 1 of the plug-in connector is cruciform, with a longitudinal portion 1a and two oppositely positioned projections 2 and 3; with three terminal engaging prongs 4, 5 and 6 projecting from the longitudinal part of the body; and with three prong-engaging terminals 7, 8 and 9 within the face of the one projection 2.
  • a pigtail conductor 10 projecting from the lOngitudinal portion 1a of the body 1.
  • FIGURE 2 the near face of the longitudinal part 1a of the body 1 is shown as having therein three prongreceiving terminals 21, 22 and 23.
  • the opposite end of the longitudinal portion 1a of the body 1 are shown two of the projecting prongs 4 and 6 illustrated in FIG- URE 1; the third prong 5 shown in FIGURE 1 being hidden in this FIGURE 2.
  • the three prong-engaging terminals 24, 25 and 26 within the face of the other projection 3 are also illustrated in this FIG- URE 2.
  • FIGURE 3 the longitudinal portion 1a of the body 1 and the projections 2 and 3 from the longitudinal portion 1a of the body 1 are illustrated as broken line circles.
  • the three projecting prongs 4, 5 and 6 of the main or longitudinal part 1a of the body 1 are shown as being electrically connected to the three prong-receiving terminals 21, 23 and 22, respectively, by the three longitudinal conductors 31, 32 and 33, respectively.
  • the upper projection 2 is illustrated as having two of its prong-receiving terminals 9 and 8 electrically connected to the two outer longitudinal conductors 31 and 33, respectively, by the two transverse connectors 37 and 36, respectively.
  • the lower projection 3 is shown as having two of its prong-receiving terminals 25 and 26 electrically connected to longitudinal conductors 32 and 31, respectively, by two transverse conductors 39 and 40, respectively.
  • the other two prong-receiving terminals 7 and 24 of the body projections 2 and 3, respectively, are shown to be electrically connected to the pigtail conductor 10 by the conductors '35 and 38, respectively.
  • the three prong-engaging terminals of the one projection 2 are arranged with no two of them being parallel, which is according to one standard type of plug-in connector.
  • the other projection 3 also with three prong-receiving terminals, has the hot terminal 25 and the neutral terminal 26 parallel to each other and that permits either a common plug-in connector with two parallel prongs or a connector with a safety ground prong as Well as the usualtwo parallel prongs, to be plugged into it.
  • plug-in connectors are standard types.
  • One is a common two parallel prong plug which can be inserted into the parallel prong-receiving terminals of the projection 3 for lighting purposes.
  • the other is a common three-prong plug having two parallel prongs and one polarized prong for grounding purposes. This is done through the prong-receiving terminal 24 of the projection 3 which in turn is connected to grounding out pigtail 10.
  • the pigtail 10 is for the purpose of grounding out the metal shell or housing of all electric motors, drills and other devices requiring grounding out and is designed to comply with all safety codes.
  • the device of the present invention can be made of such conventional materials as are used in Underwriters approved plug-in connectors for use in connection with electrical currents at the voltages for which the plug-in connector herein described is to be used.
  • the device of the present invention is particularly useful in those instances in which the permanent wiring has not been installed, yet it is necessary to have electrical service available.
  • One such instance is in the construction of a new building.
  • temporary electrical service usually is of the three-wire system having two hot conductors and one neutral, with the diiference in potential between the two hot wires being 230 volts, for example, and the potential difierence between either of the hot wires and the neutral wire being volts, for example.
  • the device of the present invention makes it possible to install 230 volt convenience outlets for the utilization of both 230 volt and 115 volt service from one convenience outlet. That eliminates the necessity of installing both 230 volt and 115 volt convenience outlets and, more particularly, eliminates the dangerous practice of attaching an extra socket to the prongs of a plug by connecting one wire to the hot screw of said plug and another wire to the common, neutral or ground screw of said plug.
  • An electrical plug-in connector comprising, a body formed of insulating material, three electrically conductive prongs projecting from one portion of said body, said prongs being spaced from each other and so shaped that two of the prongs may engage electrically charged contacts of a convenience outlet with the third prong being located and shaped to engage a neutral contact of said convenience outlet, a high voltage station on said body comprising-three circumferentially spaced openings in a portion of said body, prong receiving terminals within said body respectively adjacent said openings, three con- 'dnctors encased within the body extending respectively from one of said prongs to one of said prong receiving terminals, and a low voltage station on said body having two substanially parallel laterally spaced slots therein, two prong engageable terminal contacts within the body at said low voltage station with one contact accessible through each of said slots, and conductors within said body connecting said terminal contacts to one of said chargeable conductors and to said neutral conductor.

Description

Aug. 1, 1961 J. MUSSARI, JR
ELECTRICAL PLUG-IN CONNECTOR Filed Dec. 26, 1957 INVENTOR. \70s'epk MUSSCZTt K77:
Q15 0 neg.
United StatesPatent O 2,994,849 ELECTRICAL PLUG-IN CONNECTOR Joseph Mussari, Jr., 724 16th St., Niagara Falls, N.Y. Filed Dec. 26, 1957, Ser. No. 705,200 1 Claim. (Cl. 339-159) Present day electrical energy distribution methods include a three-wire system in which the difference in potential'between two of the conductors is 230 volts, for example, and the difference in potential between either of those conductors and the third conductor is 115 volts, for example. In common parlance, two of the wires or conductors are said to be hot and the third is referred to as neutral. It is common practice to have the potential difierence between the two hot wires twice that of the potential difference between the neutral wire and either of the hot wires.
The present invention relates to a plug-in connector suitable for use with a convenience outlet in the threewire system described supra, and has as an object the safe provision of electrical energy at the potential difference existing between the neutral and either of the hot wires and also, if it is so desired, at the potential difference existing between the two hot wires.
The invention resides in the combination of elements and arrangement of parts as hereinafter described and illustrated.
An understanding of the invention will be obtained by reference to the drawings, in which:
FIGURE 1 is an exterior perspective view of one em bodiment of the invention;
FIGURE 2 is an exterior perspective view of the same embodiment of the invention but viewed from the opposite end and with the device rotated one hundred eighty degrees (180") about its longitudinal axis; and
FIGURE 3 is a diagrammatic sketch illustrating the electrical conductor arrangement of the embodiment of the invention illustrated in FIGURE 1 and FIGURE 2.
In FIGURE 1 there is illustrated an embodiment of the invention in which the body 1 of the plug-in connector is cruciform, with a longitudinal portion 1a and two oppositely positioned projections 2 and 3; with three terminal engaging prongs 4, 5 and 6 projecting from the longitudinal part of the body; and with three prong-engaging terminals 7, 8 and 9 within the face of the one projection 2. There is also shown in this FIGURE 1 a pigtail conductor 10 projecting from the lOngitudinal portion 1a of the body 1.
In FIGURE 2 the near face of the longitudinal part 1a of the body 1 is shown as having therein three prongreceiving terminals 21, 22 and 23. At the opposite end of the longitudinal portion 1a of the body 1 are shown two of the projecting prongs 4 and 6 illustrated in FIG- URE 1; the third prong 5 shown in FIGURE 1 being hidden in this FIGURE 2. Also illustrated in this FIG- URE 2 are the three prong- engaging terminals 24, 25 and 26 within the face of the other projection 3, and the pigtail conductor 10 projecting from the body 1.
In FIGURE 3 the longitudinal portion 1a of the body 1 and the projections 2 and 3 from the longitudinal portion 1a of the body 1 are illustrated as broken line circles. The three projecting prongs 4, 5 and 6 of the main or longitudinal part 1a of the body 1 are shown as being electrically connected to the three prong-receiving terminals 21, 23 and 22, respectively, by the three longitudinal conductors 31, 32 and 33, respectively. The upper projection 2 is illustrated as having two of its prong-receiving terminals 9 and 8 electrically connected to the two outer longitudinal conductors 31 and 33, respectively, by the two transverse connectors 37 and 36, respectively. The lower projection 3 is shown as having two of its prong-receiving terminals 25 and 26 electrically connected to longitudinal conductors 32 and 31, respectively, by two transverse conductors 39 and 40, respectively. The other two prong-receiving terminals 7 and 24 of the body projections 2 and 3, respectively, are shown to be electrically connected to the pigtail conductor 10 by the conductors '35 and 38, respectively.
As illustrated in FIGURE 3, the three prong-engaging terminals of the one projection 2 are arranged with no two of them being parallel, which is according to one standard type of plug-in connector. The other projection 3, also with three prong-receiving terminals, has the hot terminal 25 and the neutral terminal 26 parallel to each other and that permits either a common plug-in connector with two parallel prongs or a connector with a safety ground prong as Well as the usualtwo parallel prongs, to be plugged into it. I
These two types of plug-in connectors are standard types. One is a common two parallel prong plug which can be inserted into the parallel prong-receiving terminals of the projection 3 for lighting purposes. The other is a common three-prong plug having two parallel prongs and one polarized prong for grounding purposes. This is done through the prong-receiving terminal 24 of the projection 3 which in turn is connected to grounding out pigtail 10. The pigtail 10 is for the purpose of grounding out the metal shell or housing of all electric motors, drills and other devices requiring grounding out and is designed to comply with all safety codes.
The device of the present invention can be made of such conventional materials as are used in Underwriters approved plug-in connectors for use in connection with electrical currents at the voltages for which the plug-in connector herein described is to be used.
The device of the present invention is particularly useful in those instances in which the permanent wiring has not been installed, yet it is necessary to have electrical service available. One such instance is in the construction of a new building. In such cases it is not unusual for temporary electrical service to be installed at the very beginning of the work or very soon thereafter, and such temporary electrical service usually is of the three-wire system having two hot conductors and one neutral, with the diiference in potential between the two hot wires being 230 volts, for example, and the potential difierence between either of the hot wires and the neutral wire being volts, for example.
Some electrical driven equipment used in the construction industry requires current at 230 volts, for example, and other equipment requires current at 115 volts, for example. To satisfy such requirements it is necessary to run three wire lines to various parts of the job. The device of the present invention makes it possible to install 230 volt convenience outlets for the utilization of both 230 volt and 115 volt service from one convenience outlet. That eliminates the necessity of installing both 230 volt and 115 volt convenience outlets and, more particularly, eliminates the dangerous practice of attaching an extra socket to the prongs of a plug by connecting one wire to the hot screw of said plug and another wire to the common, neutral or ground screw of said plug.
Having thus described my invention, I claim:
An electrical plug-in connector comprising, a body formed of insulating material, three electrically conductive prongs projecting from one portion of said body, said prongs being spaced from each other and so shaped that two of the prongs may engage electrically charged contacts of a convenience outlet with the third prong being located and shaped to engage a neutral contact of said convenience outlet, a high voltage station on said body comprising-three circumferentially spaced openings in a portion of said body, prong receiving terminals within said body respectively adjacent said openings, three con- 'dnctors encased within the body extending respectively from one of said prongs to one of said prong receiving terminals, and a low voltage station on said body having two substanially parallel laterally spaced slots therein, two prong engageable terminal contacts within the body at said low voltage station with one contact accessible through each of said slots, and conductors within said body connecting said terminal contacts to one of said chargeable conductors and to said neutral conductor.
References Cited in the file of this patent UNITED STATES PATENTS 2,067,796 Smith Jan. 12, 1937 4 t -OBrien Mar. 16, 1943 OBrien June 20, 1944 OBrien June 20, 1944 Eisner Oct. 11, 1949 Harcharek Aug. 21, 1951 FOREIGN PATENTS Great Britain June 8, 1937 OTHER REFERENCES Electrical Engineering, October 1952, pp. 879-902. Electrical Engineering, April 1955, pp. 286 291.
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Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3183474A (en) * 1962-03-05 1965-05-11 Pacific Electricord Company Female socket for electrical coupling
US3351892A (en) * 1967-02-06 1967-11-07 Amp Inc Polarized patchcord
US3441896A (en) * 1967-05-29 1969-04-29 Robert D Hawkins Compatible electrical outlet socket and plug
US3484735A (en) * 1968-09-30 1969-12-16 Coleman Cable & Wire Co Electric terminal adapter
US3509356A (en) * 1967-12-15 1970-04-28 Peebles David M Selective circuit connector
US3535667A (en) * 1968-12-06 1970-10-20 Henry C Harnish Jr Electrical safety device
US3851243A (en) * 1970-03-04 1974-11-26 P Banner Polarity testing adaptor means
US4585286A (en) * 1985-08-05 1986-04-29 Darrell Parr Universal electrical plug adapter
US4605273A (en) * 1984-12-17 1986-08-12 Horton Paul D Parallel-blade/twist-lock adapter plug
US4746298A (en) * 1986-07-15 1988-05-24 Omega Engineering, Inc. Universal connector for thermocouples
US4911649A (en) * 1989-02-16 1990-03-27 Helmich Jr Daniel F Electrical converter device
US5474464A (en) * 1991-09-10 1995-12-12 Rutland Gilts Limited Electrical adaptor
US5672066A (en) * 1996-01-16 1997-09-30 Yeung; Peter Electric transformer
US5803754A (en) * 1991-01-08 1998-09-08 Nextek Power Systems Inc. Modified receptacle and plug for low voltage DC distribution
US5855064A (en) * 1994-05-25 1999-01-05 Delta Electronics, Inc. Method of making personal computer power supply systems
US5934096A (en) * 1997-10-21 1999-08-10 Hussmann Corporation Wiring system for commercial refrigeration
US6239512B1 (en) 1999-07-28 2001-05-29 Rheem Manufacturing Company Electric water heater with simplified phase conversion apparatus
US6737582B2 (en) * 2002-08-02 2004-05-18 Seiko Epson Corporation Power connector
US6902429B1 (en) 2004-07-29 2005-06-07 Frederick A. Brooks Multiple electrical outlet device
US20060087246A1 (en) * 2004-10-12 2006-04-27 Philip Tan Lian S Connector apparatus, and associated method, for powering a set of consumer electronic devices
US9306349B2 (en) * 2014-01-21 2016-04-05 Allocacoc Corporation Construction of an alternating current (AC) power socket

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2067796A (en) * 1933-04-27 1937-01-12 Gen Electric Electric cord and attachment cap
GB466935A (en) * 1935-08-28 1937-06-08 Woolf Dabscheck Improvements in and relating to electric adaptors
US2313960A (en) * 1940-09-13 1943-03-16 Pierce John B Foundation Electrical wiring system
US2351631A (en) * 1941-06-14 1944-06-20 Pierce John B Foundation Electricity conductor unit
US2351632A (en) * 1942-04-27 1944-06-20 Pierce John B Foundation Polarized outlet section for electric wiring systems
US2484558A (en) * 1947-10-25 1949-10-11 John H Eisner Attachment plug
US2565075A (en) * 1948-12-31 1951-08-21 Joseph M Harcharek Electrical plug receptacle for remote control of loads

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2067796A (en) * 1933-04-27 1937-01-12 Gen Electric Electric cord and attachment cap
GB466935A (en) * 1935-08-28 1937-06-08 Woolf Dabscheck Improvements in and relating to electric adaptors
US2313960A (en) * 1940-09-13 1943-03-16 Pierce John B Foundation Electrical wiring system
US2351631A (en) * 1941-06-14 1944-06-20 Pierce John B Foundation Electricity conductor unit
US2351632A (en) * 1942-04-27 1944-06-20 Pierce John B Foundation Polarized outlet section for electric wiring systems
US2484558A (en) * 1947-10-25 1949-10-11 John H Eisner Attachment plug
US2565075A (en) * 1948-12-31 1951-08-21 Joseph M Harcharek Electrical plug receptacle for remote control of loads

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3183474A (en) * 1962-03-05 1965-05-11 Pacific Electricord Company Female socket for electrical coupling
US3351892A (en) * 1967-02-06 1967-11-07 Amp Inc Polarized patchcord
US3441896A (en) * 1967-05-29 1969-04-29 Robert D Hawkins Compatible electrical outlet socket and plug
US3509356A (en) * 1967-12-15 1970-04-28 Peebles David M Selective circuit connector
US3484735A (en) * 1968-09-30 1969-12-16 Coleman Cable & Wire Co Electric terminal adapter
US3535667A (en) * 1968-12-06 1970-10-20 Henry C Harnish Jr Electrical safety device
US3851243A (en) * 1970-03-04 1974-11-26 P Banner Polarity testing adaptor means
US4605273A (en) * 1984-12-17 1986-08-12 Horton Paul D Parallel-blade/twist-lock adapter plug
US4585286A (en) * 1985-08-05 1986-04-29 Darrell Parr Universal electrical plug adapter
US4746298A (en) * 1986-07-15 1988-05-24 Omega Engineering, Inc. Universal connector for thermocouples
US4911649A (en) * 1989-02-16 1990-03-27 Helmich Jr Daniel F Electrical converter device
US5803754A (en) * 1991-01-08 1998-09-08 Nextek Power Systems Inc. Modified receptacle and plug for low voltage DC distribution
US5474464A (en) * 1991-09-10 1995-12-12 Rutland Gilts Limited Electrical adaptor
US5855064A (en) * 1994-05-25 1999-01-05 Delta Electronics, Inc. Method of making personal computer power supply systems
US5672066A (en) * 1996-01-16 1997-09-30 Yeung; Peter Electric transformer
US5934096A (en) * 1997-10-21 1999-08-10 Hussmann Corporation Wiring system for commercial refrigeration
US6239512B1 (en) 1999-07-28 2001-05-29 Rheem Manufacturing Company Electric water heater with simplified phase conversion apparatus
US6737582B2 (en) * 2002-08-02 2004-05-18 Seiko Epson Corporation Power connector
US6902429B1 (en) 2004-07-29 2005-06-07 Frederick A. Brooks Multiple electrical outlet device
US20060087246A1 (en) * 2004-10-12 2006-04-27 Philip Tan Lian S Connector apparatus, and associated method, for powering a set of consumer electronic devices
US7435141B2 (en) * 2004-10-12 2008-10-14 Radioshack Corporation Connector apparatus, and associated method, for powering a set of consumer electronic devices
US9306349B2 (en) * 2014-01-21 2016-04-05 Allocacoc Corporation Construction of an alternating current (AC) power socket

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