Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.


  1. Advanced Patent Search
Publication numberUS3059209 A
Publication typeGrant
Publication dateOct 16, 1962
Filing dateMay 5, 1958
Priority dateMay 5, 1958
Publication numberUS 3059209 A, US 3059209A, US-A-3059209, US3059209 A, US3059209A
InventorsBird Vincent J
Original AssigneeBird Vincent J
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Cap for electrical plug connections
US 3059209 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)


ayzfg a? United States Patent C) 3,059,209 CAP FOR ELECTRICAL PLUG CONNECTIONS Vincent J. Bird, 1029 N. 32nd St., Omaha, Nehr. Filed May 5, 1958, Ser. No. 732,888 1 Claim. (Cl. 339-75 This invention relates to a protective cover for electrical plug and socket connections and, more particularly, it is an object to provide a new cover concept which through a combination of features attains the best total of the following advantages:

(a) Ready removabil-ity of the cover for disconnection.

(b) A cover suificiently flexible and resilient as to be durable enough to prevent excessive distortion or weakening from frequent opening and closing, a problem not present in wire splice-type coverings.

(c) A sufficient firmness and shape for holding a plug and socket in electrical connection, a feature also not involved in splice-type connections.

(d) A springlike attached or imbedded band providing resiliency for frequent removal and for urging portions of the body at the sides of a slit opening into meeting relation to protect the plug and socket from conductive foreign material such as moist dirt or iron filings and to firmly hold'the plug and socket together in electrical connection at times when considerable tension is placed on the cords that would otherwise tend to pull them apart.

(e) An interior of a size for receiving a plug and socket yet also sufficiently small to prevent the plug and socket from becoming electrically disconnected, a problem and feature not present in splice covers.

Further object is to provide a cover as described which has notch means on its outer side adjacent a slit therein for facilitating the prying apart of said cover by the insertion of fingertips in said notch means for rapid re moval for insertion of a plug and socket.

Further object is to provide a cover having at least most of the features above described, and further having a conductor extending therethrough, said conductor having exposed portions at ends of cover at which ground wires of electrical cords can be connected.

Other features and advantages of the invention will appear from the following description taken in connection with the drawings, wherein:

FIGURE 1 is a perspective view showing the improved cap or housing positioned over plugs of electric cords.

FIGURE 2 is a cross section through the device, taken on line 22 of FIGURE 1.

FIGURE 3 is an end elevational view of the cap showing the device held in an open position, in which position plugs and cords may be inserted therein and removed therefrom.

FIGURE 4 is a longitudinal section through the cap showing a modification wherein a ground connection between two cords is extended through the wall of the cap.

FIGURE 5 is a view taken on line 55 of FIGURE 4 showing a section through one end of the device.

While one embodiment of the invention is illustrated in the above-referred-to drawings, it is to be understood that they are merely for the purpose of illustration and that various changes in construction may be resorted to in the course of manufacture in order that the invention may be utilized to the best advantage according to circumstances which may arise, without in any manner departing from the spirit and intention of the device, which is to be limited only in accordance with the appended claim. And while there is stated the primary field of utility of the invention, it remains obvious that it may be employed in any other capacity wherein it may be found applicable.

In the accompanying drawings, and in the following "ice specification, the same reference characters are used to designate the same parts and elements throughout, and in which the numeral 10 refers to the invention in its entirety, numeral 12 indicating a case of rubber, or other suitable insulating material and having a slit 14 extended continuously through one side thereof, and numeral 16 a band of spring material embedded in the wall 18 of the case or housing.

The ends it the housing are provided with openings 20 and 22 through which cords 24 and 26 of plugs 28 and 30* extend, and the openings are surrounded with beads 32, as shown in FIGURE 3. The surfaces 34and 36 of the housing at the sides of the slit are forced open, as shown in FIGURE 3, to facilitate inserting and removing the plugs and cords, by prying elements such as the thumb nails of an operator, inserted in notches 38 and 40. The cords 24 and 26 are provided with wires, such as the wires 42 and 44.

The spring band 16 is embedded in the material of the cap or housing and, as shown in FIGURE 2, the ends of the band terminate at the points 46 and 48 wherein the ends are spaced from the surfaces 34 and 36. With the band 16 positioned in this manner the surfaces 34 and 36 are urged together substantially sealing the interior of the cap, so that should the cap drop into water the connecting elements of the plugs will not be short circuited.

In the design shown in FIGURES 4 and 5, a cap 50, which is provided with a continuous slit 52, is provided with a connector 54 that extends from a sleeve 56 at one end to a sleeve 58 at the opposite end, providing a ground or connection between the ground wire of a three wire circuit, ends 60 and 62 of the ground wires of the cords 64 and 66 being connected to the sleeves 56 and 58, as shown in FIGURE 4. The ends of the sleeves 56 and 58 are provided with flanges 6-8 and 70, and the extended ends of the flanges are provided with projections 72 and 74 that project into the surfaces 76 and 78 of the cap at the sides of the slit 80. The edges of the wall of the cap are also provided with finger or thumb nail receiving notches 82 and 84, and the cap 50 may be provided with a spring band 86, similar to the band 16, of the design shown in FIGURES 1 and 2.

The cords 64 and 66, in which wires 88 and 90 are positioned, extend through the sleeves 56 and 58 and the current carrying wires thereof are connected to terrninals of the plugs 92 and 94 in the cap.

The wall of the cap, casing, or housing may be made of rubber, plastic, or other suitable insulating material, and the material should have sufficient stiffness inherent therein to respond to the spring band so that the device remains closed except when opened to insert or remove wires.

Operation With the parts formed as illustrated and described the male and female plugs of an electric cord are assembled in the conventional manner and with the surfaces at the sides of the slit forced apart the plugs are forced through the slit with the wires in the openings or sleeves at the ends of the cap, and with the plugs and wires in positions in the device the portions at the sides of the slit are released so that the plugs are substantially sealed therein. The device, therefore, provides a safety guard whereby plugs of electric cords are retained in assembled relation and the possibility of fire, or other damage resulting from accidental separation of plugs of electric cords is obviated.

From the foregoing specification, it will become apparent that the invention disclosed will adequately accomplish the functions for which it has been designed and in an economical manner, and that its simplicity, ac-

curacy, and ease of operation are such as to provide a relatively inexpensive device, considering what it will accomplish, and that it Will find an important place in the art to which it appertains when once placed on the market.

It is thought that persons skilled in the art to which the invention relates will be able to obtain a clear understanding of the invention after considering the description in connection with the drawings. Therefore, a more lengthy description is regarded as unnecessary.

Changes in shape, size, and arrangement of details and parts, such as come within the purview of the invention claimed may be resorted to in actual practice, if desired.

Having now described the invention that which is claimed to be new and desired to be procured by Letters Patent, is:

A device for enclosing an electrical plug and socket comprising in combination: a body flexible enough for durability and firm enough to maintain itself biased toward at normal shape, said body having a hollow interior large enough to receive a plug and socket yet small enough to prevent said plug and socket from becoming electrically disconnected, said body having a wall of insulating material with a continuous slit in one side and cord receiving openings in the ends of much smaller size than the interior of said body for fitting closely about cords, and a concavo-convex spring band engaging the intermediate part' of said body, the spring band being positioned to urge portions of the body at the sides of the slit into meeting relation to protect a plug and socket from conductive foreign material and to firmly hold a plug and socket together, said body and said spring band being sufiiciently flexible and resilient that said body can be pried apart frequently and sufficiently for ready removal and replacement of a plug and socket with sufficient durability to prevent excessive distortion or weakening, and a conductor imbedded in said cover and extending from one end of said cover to the other, portions of said conductor extending outwardly of said cover at the ends of said cover for the connection thereto of ground wires of cords.

References Cited in the file of this patent UNITED STATES PATENTS 912,778 Banes Feb. 16, 1909 1,245,931 Lanman Nov. 6, 1917 1,620,933 Wilcox Mar. 15, 1927 1,794,278 Carney Feb. 24, 1931 2,229,849 Heidebrecht Jan. 28, 1941 2,267,630 Weiland Dec. 23, 1941 2,667,906 Stiller Feb. 2, 1954 2,720,633 Westberg Oct. 11, 1955 2,725,543 Tanner Nov. 29, 1955 FOREIGN PATENTS 190,515 Switzerland July 1, 1937

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US912778 *Jan 23, 1908Feb 16, 1909Edward T BanesTelephone-cord protector.
US1245931 *Nov 4, 1916Nov 6, 1917Guy R LanmanSpark-plug protector.
US1620933 *Mar 1, 1926Mar 15, 1927Wilcox Joseph TCasing protector
US1794278 *Feb 8, 1930Feb 24, 1931Carney Splice Protector CompanWire-line protector
US2229849 *Aug 21, 1939Jan 28, 1941Quincy Heidebrecht AbrahamInsulating splice cover
US2267630 *Jun 19, 1940Dec 23, 1941Weiland Frank JElectric wire splice
US2667906 *Oct 16, 1951Feb 2, 1954Stiller BenjaminSelf-closing container
US2720633 *Jun 12, 1953Oct 11, 1955Westberg Oscar EClamp for electrical connectors
US2725543 *May 18, 1951Nov 29, 1955Tanner Henry GCoupling for electrical plug connectors
CH190515A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3132912 *Nov 29, 1960May 12, 1964Mitchell FriedmanElectrical connectors
US3871731 *Sep 27, 1973Mar 18, 1975Lacoursiere Jr Peter ACage for removably enclosing coupled electrical plugs
US4169643 *Aug 10, 1977Oct 2, 1979Bunker Ramo CorporationElectrical connector mating clip
US4869683 *Jan 26, 1989Sep 26, 1989Nelson Llewellyn WProtective enclosure for electrical plug connections
US5037324 *Aug 2, 1990Aug 6, 1991Scheffey Sr Donald GPlug and socket retainer
US5110303 *Jul 30, 1991May 5, 1992Hardy James LElectrical cord connection retainer
US5401184 *Apr 26, 1993Mar 28, 1995Lynx Enterprises, Inc.Face plate for securing a waterproof connection between electrical plug and receptacle
US5506019 *Sep 29, 1994Apr 9, 1996Abeyta; Joseph T.Table cover and method of making same
US5616046 *Sep 7, 1993Apr 1, 1997Lynx Enterprises, Inc.Connection device for securing two engaged members
US6149445 *Jul 10, 1999Nov 21, 2000Daddono; Samuel J.Control pod
US7317162Mar 7, 2006Jan 8, 2008John Randall KaadyProtective housing for power cord connection
US9077111Aug 3, 2012Jul 7, 2015Synapsense CorporationPlug retention apparatus
US9461393Apr 23, 2015Oct 4, 2016Covidien LpPhysical shielding for ECG electrical connections
US20070209822 *Mar 7, 2006Sep 13, 2007Kaady John RProtective housing for power cord connection
US20100068913 *Sep 12, 2008Mar 18, 2010Edge Richard ACoupler for holding a socket and plug of two electrical cords together
WO1996027222A1 *Feb 23, 1996Sep 6, 1996Hug Plug LimitedProtective coupling for plug and socket connections
U.S. Classification439/369, 174/135, 403/310, 439/367
International ClassificationH01R13/639
Cooperative ClassificationH01R13/6392
European ClassificationH01R13/639B