US2507462A

US2507462A - Electric plug

Info

Publication number: US2507462A
Application number: US781617A
Authority: US
Inventors: Ira G Sellers
Original assignee: Individual
Current assignee: Individual
Priority date: 1947-10-23
Filing date: 1947-10-23
Publication date: 1950-05-09
Anticipated expiration: 1967-05-09

Description

y 1950 l. G. SELLERS 2,507,462

ELECTRIC PLUG Filed Oct. 25, 1947 Inventor Ira 6. Sellers m Wm Patented May 9, 1950 UNITED STATES PATENT OFFICE 2,507,462 ELECTRIC PLUG Ira G'. Sellers, SanDiego, Application October 23, 1947, Serial Na.- 781 ,61:

1 Claim. 1,,

This invention relates to new and useful improvements in electric'plugs and the primary object of the present invention is to provide a plug so designed as" to permit the same to be quickly and readily appliedto extension cords or the like in a simple and practicalmanner.

Another important object of the present invention isto'provid e an electric plug including novel and improved means for retaining conductive wires in a tightly adjustedpositionrelative to the plug.

A further object of the present invention is to provide contact fingers and novel and improved means for operatively connecting the fingers in contact with the ends of conductive wires without the necessity of having to remove any insulation from the wires.

A still further aim of the present invention is to provide an electric plug that is simple and practical in construction, strong and reliable in use, neat and attractive in appearance, relatively inexpensive to manufacture, and otherwise well adapted for the purposes for which the same is intended.

Other objects and advantages reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming part hereof, wherein like numerals refer to like parts throughout, and in which:

Figure 1 is a side elevational view of the present electric plug, and showing the same applied to a section of an insulated conductive cord;

Figure 2 is a similar view of Figure 1, and with parts of the present invention being broken away and shown in section;

Figure 3 is a perspective view of the present electric plug, and showing the conductive wires, contact fingers and wedge pins removed therefrom; and,

Figure 4 is a group perspective view of the contact fingers and the means for connecting the same to the ends of a conductive wire.

Referring now to the drawings in detail, wherein for the purpose of illustration there is disclosed a preferred embodiment of the present invention, the numeral It represents a cylindrical body of insulating material that is provided with an enlarged preferably frusto conical head l2 at one end. The body It has a longitudinal bore it that communicates with a substantially frusto conical chamber or recess 16 provided in the head l2. The chamber l6 terminates in an annular recessed portion 18 having it end wall 29 spaced An aperture or pin seat 24 centrally located in the outer face 22'ofthe head l2, communicates with-the recessed portion l8 and frictionally en'- gagesa cylindrical wedge pin Z-Ghaving itsinner end 28 tapered to extend between a pair of in sulated conductivewires filland 32 that are in: ser-ted through bore 14 and into-chamber l6 and recess [8, and the tapered end 28* of" the pin forces the conductive wires to bear against the inclined inner Walls of chamber l6 adjacent the bore id, as shown best in Figure 2 of the drawings.

The numeral 34 represents conductive caps that are provided with bevelled seats 36 for frictionally engaging the terminals of

Wires

30 and 32. Internally threaded apertures 38 are provided in these caps and communicate with seats 36. These apertures 38 adjustably engage the externally threaded portion 40 of contact fingers 42.

In practical use of the device, the wires 3| and 32 are extended through bore l4, chamber [6 and outwardly through aperture 24, so that the caps 36 may frictionally engage the terminals of the

wires

30 and 32. The threaded portions 4| of the contact fingers 42 are then adjusted in apertures 33, so that the pointed extremities 44 at one terminal of said contact fingers will engage the core of the

wires

30 and 32 to conduct a source of electricity from the wires to the contact fingers 42, as shown best in Figure 3 of the drawings. The portion of the contact fingers adjacent the threaded portions 40, are then frictionally fitted into slits 4t that connect the apertures 24 to contact finger seats 48 provided in the face 22 of head l2, that communicate with chamber It, so that the contact fingers will project outwardly from the head in spaced parallelism relative to each other. The wedge pin 26 is then frictionally driven into the aperture 24, so that its tapered end 28 will force the

wires

30 and 32 to bear against the inner wall of chamber l6 adjacent bore Hi, thus retaining the wires fixedly secured in the electric plug thus described.

In view of the foregoing description taken in conjunction with the accompanying drawings it is believed that a clear understanding of the construction, operation and advantages of the device will be quite apparent to those skilled in this art. A more detailed description is accordingly deemed unnecessary.

It is to be understood, however, that even though there is herein shown and described a preferred embodiment of the invention the same Having described the invention what is claimed as new is:

An electric plug comprising an insulated resilient body having an axial bore, said bore having inner and outer end portions, a recess provided in said body and forming an enlargement of said bore, said body having an end wall in which the inner end portion of said bore is provided, a pair of openings in the end wall spaced from each other and the inner end portion of said bore, slits provided in said end wall and connecting the pair of openings with the inner end portion of said bore, a pair of conductive wires having inner end portions extending through the outer end portion of said bore and into said recess, the inner end portions of said wires having tips, caps fitted on the tips of said wires and disposed beneath the end wall of said body, said caps having internally threaded apertures, a pair of contact fingers having threaded end portions receivably engaging the threaded apertures, pointed elements projecting from the threaded end portions of said contact fingers and contacting the tips of said wires, and a cylindrical wedge frictionally fitted in the inner end portion of said bore and having a tapered end forcing the wires against the inner wall of said recess, said wedge also retaining said caps spaced from each other, said wedge adapted to ride against said caps for forcing the fingers from the inner end portion of the bore laterally through said slits and into said pair of openings during assembly.

v IRA G. SELLERS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 721,042 Holland Feb. 17, 1903 1,319,915 Tregoning Oct. 28, 1919 1,694,683 Cole Dec. 11, 1928 2,032,470 Chirelstein Mar. 3, 1936 2,094,046 Short Sept. 28, 1937 2,173,820 Andre Sept. 26, 1939 2,181,575 Chirelstein Nov. 28, 1939 2,246,901 Schwarzmann June 24, 1941 2,422,393 Bryant June 17, 1947 2,429,278 Roche Oct. 21, 1947 FOREIGN PATENTS Number Country Date 23,504 Netherlands Feb. 16, 1931 178,337 Switzerland Jan. 2, 1936 212,983 Great Britain Mar. 19, 1924 357,516 Germany Aug. 25, 1922