US 2491586 A
Abstract available in
Claims available in
Description (OCR text may contain errors)
Dec. 20, 1949 1.. SCHOTT 2,491,586
ADAPTER FOR WALL SOCKETS Filed May 25, 1948 IN V EN T 0R. ZAW/QEA/CE Scwo 7r ATTORNEY Patented Dec. 20, 1949 UNITED STATES PATENT OFFECE 1 Claim.
This invention relates to an adapter for wall sockets. In recent years the use of wall sockets or outlets has increased very rapidly, and it is quite commonplace to find one that is not in proper operating condition. This is due to the fact that the resilient contacts therein become burned and gradually spread apart. Then when the prongs of a plug are inserted either an imperfect contact, which is a fire hazard, or no con tact at all is made. Again, to renew a wall socket frequently involves the employment of an electrician, or if the man of the house undertakes the job a considerable delay often results due, in part, to the fact that the circuit must be disconnected during the operation and it is not possible to install a fresh wall socket in the dark.
It is an object of the invention to provide an adapter for wall sockets which can be installed in operative position in a matter of seconds by anyone having no knowledge of electricity, and which, when once in place, again renders a socket, wherein the contacts have spread too far apart, fully operative, and eliminates any fire hazard that may have existed before its installation. In other words my invention provides a filler to compensate for deformation or wear of the spring contacts in a wall socket to insure that no air gap will exist between the said spring contacts and the prongs of a wall plug when the latter are inserted in the socket.
Another object of the invention is to provide an adapter for wall sockets which, when once installed, remains permanently in position and cannot be displaced when an extension cord is removed and the prongs of the plug on the latter Withdrawn from the adapter.
A further object of the invention is to provide such an adapter for wall sockets which, when installed is practically unnoticeable, and which is both cheap and simple to manufacture.
Having thus briefly stated some of the objects and advantages of the invention I will now describe a a preferred embodiment thereof with the aid of the accompanying drawing, in which:
Figure 1 is a side view, partly in section, showing the adapter in a wall socket and with a plug in engagement with the adapter.
Figure 2 is a front view of Figure 1, and
Figure 3 is an enlarged section on the line 3-3 of Figure 2, showing only the socket, the adapter and the plug and ignoring the box for the socket.
Figure 4 is a front view of the adapter alone,
Figure 5 is a side view taken on the line 5-5 of Figure 4, and
Figure 6 is a rear view of the adapter on the line E-fi of Figure 5.
Referring to the drawing, l designates a conventional wall socket which includes an insulating member '2 having parallel slots 3 formed through its outer face, and spring contacts 4 therein each secured by a terminal screw 5 in a cavity formed in the said member from the back thereof. This member 2 is usually secured in a cup ii by a screw 1, and formed also through the said cup are apertures for the passage of leads 8 one extremity of each of which is secured to one of the terminal screws 5. Portions of the spring contacts 4 intermediateiy of their length extend toward one another so that when prongs of a conventional plug on one extremity of an extension cord are inserted through the slots 3 they make electrical connections with the said spring contacts 4 and force the latter farther apart against the tension of the springs. However after repeated insertion and removal of these prongs into and out of engagement with the contacts 4 the latter gradually lose their resilience and spread farther apart, particularly if they are often subjected to heat as the connections are made and broken, and the spacing between the contacts increases to such an extent that either imperfect connections, or no connections at all, are made between the said spring contacts and the prongs. Then unless special means are taken for correcting this situation the wall socket must be renewed. In order to obviate the necessity for renewal I provide a special adapter to compensate for the defect in the wall socket that has thus arisen.
My adapter consists of an insulating body iii projecting from one side of which are spaced resilient prongs ll having outwardly and rearwardly folded extensions [2, so that the prongs and their extensions are substantially V-shaped. The extensions l2 are of such length that the spacing between the body Hi and their outer extremities is only slightly greater than the thickness of the wall of the socket member 2 through the slots 3 in which the prongs H and their ex tensions are to be inserted. The resilience of the said prongs and particularly of their extensions is such that however much the spacing between the spring contacts 4 has increased, the extensions will make full and satisfactory electrical connections with them. The thickness of the prongs I l and their extensions I2 is also such that they may be freely inserted through the slots 3 of a socket member 2, and, due to the V-formation of the prongs and extensions, once they have been completely inserted through the slots 3 they cannot be withdrawn, because as soon as the extensions are wholly within the cavity in the socket member 2 they spring outwardly into engagement with the spring contacts 4. Consequently any force exerted on the body I0 to draw the latter away from the member 2 is resisted by the front wall of the latter, so that the adapter cannot be removed from the wall socket, except, after removal and disassembly of the latter. through the body is in registry with the adjacent sides of the prongs H are slots 13 through which conventional prongs M of an ordinary plug connection It may be inserted so that the said prongs I4 are then in firm electrical connection with the prongs ll.
In the present instance the body ll] of my adapter is shown comprising two superimposed discs Ida and illb secured to one another as by a rivet it. I 8 project has transverse groove ll formed in its inner face to receive folded portions of the prongs H the adjacent extremities of which are again folded and anchored in apertures [B in the disc 10a parallel with and outwardly spaced from the slots [3. Moreover it will be noted that the prongs ii are so spaced and arranged that when the prongs [4 of the plug [5 are inserted through the slots l3 they bear against the inner faces of the said prongs II and tend to force the latter outward and thus bring the extensions I2 into even firmer contact with the spring contacts 4. The purpose of the outer disc I02) is to cover the grooves I! and the portions of the prongs H therein, thus while the slots I3 extend through both discs Ida and 1% the prongs H are only in registry with the slots formed through the disc 10a so that the prongs Id of the conventional plug l5 come into contact with the prongs ll only within the adapter and not at its outer face.
While in the foregoing one embodiment of the invention has been described and shown, it is un- Formed The disc l0a from which the prongs mg! derstood that alterations and modifications may be made thereto provided the said alterations and modifications fall within the scope of the appended claim.
What I claim is:
An adapter of the character described comprising a substantially fiat body having spaced openings extending therethrough, resilient prongs extending part way into said openings and thence laterally and being embedded in said body whereby the upper ends of said openings are spaced from said prongs so as to permit the free entry therethrough of the prongs on a plug, said first mentioned prongs being adapted to be inserted .a through apertures in a socket, the lower ends of said prongs having resilient outwardly and up wardly folded extensions integrally formed thereon, the upper ends of said extensions being spaced from the lower face of said body whereby said ends are adapted to underlie the face of the socket and prevent detachment of the adapter there from, the prongs on the plug projecting through said body and engaging the adapter prongs whereby lateral pressure is exerted on the extensions to force the same into engagement with the contacts of the socket.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 2,005,441 Shearer June 18, 1935 2,231,038 Thomas Feb. 11, 1941 2,259,207 Hunt Oct. 14, 1941 FOREIGN PATENTS Number Country Date 633,425 Germany Aug. 30, 1934