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Publication numberUS3436105 A
Publication typeGrant
Publication dateApr 1, 1969
Filing dateOct 22, 1965
Priority dateOct 22, 1965
Publication numberUS 3436105 A, US 3436105A, US-A-3436105, US3436105 A, US3436105A
InventorsMiklya John
Original AssigneeMiklya John
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Connector
US 3436105 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

April 1969 J. MlKLYA 3,436,105

CONNECTOR Filed 00?. 22, 1965 I NVENTOR. JOHN M/Kz. YA BY Armwwr United States Patent 3,436,105 CONNECTOR John Miklya, 529 11th Ave. N., South St. Paul., Minn. 55075 Filed Oct. 22, 1965, Ser. No. 501,929 Int. Cl. F161 39/00 US. Cl. 285321 2 Claims ABSTRACT OF THE DISCLOSURE A versatile connector for attachment to members of generally circular cross-section, especially electrical conduit or cable. The connector has a socket for receiving the circular member, the socket being provided with a plurality of aligned equidistantly spaced circumferential apertures in the wall, into which fits a spring member having radially inwardly urged protrusions mating with and extending through the apertures. The protrusions have gripping contact points, such as teeth which are oriented away from the open end of the socket. The teeth will slide with respect to the circular member when inserted into the socket, but normally will engage the surface of the member when an attempt is made to withdraw it from the socket. The ends of the spring member are spreadable, so as to permit lifting of the protrusions freeing the circular member for removal.

The present invention relates generally to electrical connectors, and particularly to connectors by which fiexible conduit is attached to electrical connection boxes.

For many years flexible electrical conduit (often known under the generic designation of Greenfield) and armored cable (known as BX cable) have been fastened to electrical boxes by means of a connector having a cylindrical socket on one end and a threaded bushing on the opposite end. The size of the threaded bushing is such as to fit within the knock outs in the outlet box, to be held in place by a threaded nut turned onto the bushing from within the box. conventionally a flange is provided to serve as a stop or shoulder which bears against the outer wall of the box, the threaded nut being tightened up against the inner wall of the box, rigidly to hold the connector in place.

The socket end of the connector is coventionally provided with a set screw. It is of a size such that Greenfield cable of conventional sizes will just fit within the socket, the set screw being tightened down upon the cable to hold it in place. Thus, is the manner in which Greenfield cable is conventionally connected to the outlet box.

As a practical matter in connecting up electrical installations, the set screw in the socket must be loosened before the Greenfield can be inserted. Often in haste the electrician inadvertently turns the set screw completely out of the socket and loses it on the floor. It is usually inconvenient or awkward to step down from a ladder in order to retrieve the set screw, and the electrician often will then discard the connector, it being less inconvenient to throw it away than to search for and retrieve the lost set screw. Needless to say, this is a wasteful practice.

The present invention is concerned with the provision of a connector in which cable can readily be inserted and held, without the need of loosening or tightening set screws, and which also can be very simply removed from the cable, should it be desired to remove or disconnect it. The nature of my invention will be apparent from the description which follows, taken in conjunction with the appended drawing, in which like reference characters refer to corresponding parts in the several views, and in which:

FIGURE 1 is a side view of my device, partially broken 3,436,105 Patented Apr. 1, 1969 away, showing Greenfield cable inserted therewithin; and

FIGURE 2 is a section view taken along the lines of 22 of FIGURE 1.

Referring now to the drawing, my novel connector 10 is formed geerally of a socket 12, a shoulder flange 14, and a threaded end or bushing 16. The shoulder and bushmg combine to provide means by which the connector is attached to an electrical box, similarly as in prior art devices; a nut (not shown) being turned onto the bushing from within the box to hold it tightly against the shoulder.

The socket 10 is generally cylindrical in shape, of inside diameter to readily but not too loosely receive cable or conduit, such as Greenfield cable. Approximately mid-way along its length the socket 12 is provided with three equidistantly spaced circumferential slots 18 in the wall thereof.

A spring 20, extending about the socket 12, is provided with three inward protrusions 22, which respectively extend into and protrude through the wall of the socket. As shown in FIGURE 2, the bases of the spring protrusions 22 are nearly, but not quite, as long as the circumferential slots 18, and preferably are slightly arcuate in shape, as shown (so as collectively to define a crrcular arc concentric with, but within, the socket wall).

The edges of the protrusion bases away from the end opening 26 of the sockets are provided with teeth 28, which extend radially inwardly and away from the socket opening.

The length of spring 20, in relation to the size of the exterior of socket 12, is such that a slight gap is left be tween the spring ends 30 and 32. It will be seen that by using a screw driver or other prying tool, the said ends can be forced apart to lift the protrusions 22 from their position within slots 18.

In use, the end 34 of a length of conduit or cable is simply inserted within socket 12. This is easily accomplished since the spring protrusions 22 and teeth 28 do not grip the cable when the motion is in this direction. Rather, they lift slightly, as necessary to accommodate the cable. However, when an attempt is made to withdraw the cable from the socket, the protrusion and teeth catch the cable and bite into it, preventing it from being pulled free.

Thus, quick secure connections to the cable can be made with my device.

Should it be desired to remove the cable, a screw driver is used to pry apart spring ends 30 and 32, and the spring protrusions are thereby lifted and freed from their grip ping contact with the cable, allowing it to be readily pulled out of the socket.

While my device, as described, contains three slots in the socket wall, and three mating protrusions in the spring, this number is not essential. Other equivalent structures are contemplated, it being understood that the description is for the purpose of illustrating my invention, not to limit it.

What I claim is:

1. In a connector adapted for attachment to a member of generally circular cross-section and a generally uniform outer surface, a socket having an open end for receiving such member, said socket having an inside diameter slightly larger than the outside diameter of said member, a plurality of aligned equidistantly spaced circumferential apertures in the wall of said socket, a spreadable spring member extending about said socket having radially inwardly urged protrusions mating with and extending through said apertures, said protrusions having gripping contact points canted radially inwardly and away from said open end, the diameter defined by said contact points when said spring member is in relaxed position about said socket being less than the outside diameter of said circular member and said protrusions defiining a diameter greater than the outside diameter of said circular member, said spring spreading and the contact points sliding with respect to said circular member when the latter is inserted into said socket, but normally frictionally engaging the external surface of said circular member and cooperating with the walls of said socket defining said apertures to prevent said circular member from being withdrawn from said socket, the ends of said spring member being further spreadable externally of said socket to lift the gripping contact points from engagement with said circular member, freeing it for removal.

2. The connector of claim 1 comprising a threaded end afiixed to said socket away from the open end thereof, and wherein said socket contains three equidistantly spaced apertures and the spring member contains three mating protrusions.

References Cited UNITED STATES PATENTS 899,639 9/1908 Vibber 285-161 4 Martin 285-321 Thomas mas-3'65 Mall 285-305 X Payne 285-321 Munger 285-305 X Briegel et al 285-161 Ferguson et a1. 24-218X Kramer 285-321 X FOREIGN PATENTS 1,294,438 4/1962 France.

CARL W. TOMLIN, Primary Examiner.

D. W. AROLA, Assistant Examiner.

US. Cl. X.R.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US899639 *Jun 4, 1908Sep 29, 1908Gillette Vibber CoBox-connector for electric installation.
US1369687 *Oct 4, 1919Feb 22, 1921William W MartinLubricator
US1881980 *Dec 17, 1930Oct 11, 1932Thomas & Betts CorpPipe coupler
US2021241 *Dec 24, 1934Nov 19, 1935William Mall ArthurQuick detachable coupling
US2535694 *Jul 6, 1946Dec 26, 1950Crane Packing CoSelf-sealing coupling
US2785910 *May 5, 1955Mar 19, 1957Amercoat CorpMolded joint for plastic tubes with latch
US3150886 *May 23, 1961Sep 29, 1964Briegel Theodore WElectrical conduit connector
US3314696 *Feb 11, 1964Apr 18, 1967Perfecting Service CompanyQuick connect coupling
US3315990 *Apr 6, 1964Apr 25, 1967Gen Connector CorpVibration damping connector for conduits
FR1294438A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4141575 *Jul 27, 1977Feb 27, 1979Thomas & Betts CorporationCoupling sleeve
US4490576 *Aug 10, 1981Dec 25, 1984Appleton Electric Co.Connector for use with jacketed metal clad cable
US4723796 *Jan 30, 1987Feb 9, 1988Commander Electrical Materials, Inc.Connector for corrugated tubing
US6860758Oct 30, 2002Mar 1, 2005Bridgeport Fittings, Inc.Snap fitting electrical connector
US6916988Sep 13, 2004Jul 12, 2005Bridgeport Fittings, Inc.Electrical connector with frustro conical snap fit retaining ring
US6935891Mar 1, 2004Aug 30, 2005Bridgeport Fittings, Inc.Snap fitting electrical connector
US7045714Jan 3, 2005May 16, 2006Bridgeport Fittings, Inc.Electrical connector with conical snap fit retaining ring
US7057107Oct 26, 2005Jun 6, 2006Bridgeport Fittings, Inc.Snap fit electrical connector assembly with conical outer snap fit retainer and externally mounted internal wire retainer
US7064273Jul 13, 2005Jun 20, 2006Bridgeport Fittings, Inc.Electrical connector with conical split snap ring retainer
US7075007Jun 13, 2005Jul 11, 2006Bridgeport Fittings, Inc.Snap fit electrical connector assembly with conical outer snap fit retainer and one or more internal snap fit wire retainers
US7151223Apr 12, 2006Dec 19, 2006Bridgeport Fittings, Inc.Snap fit electrical connector assembly with outer frustro conical retainer ring and internal unidirectional snap fit wire conductor retainer
US7154042Apr 7, 2006Dec 26, 2006Bridgeport Fittings, Inc.Electrical connector with snap fit retainer ring constructed to enhance the connection of the connector to an electrical box
US7205489Feb 28, 2006Apr 17, 2007Bridgeport Fittings, Inc.Snap fit electrical connector assembly with operating tool for facilitating the connection of a connector assembly to an electrical box
US7214890Oct 10, 2006May 8, 2007Bridgeport Fittings, Inc.Electrical connector having an outlet end angularly disposed relative an inlet end with outer retainer ring about the outlet end and internal unidirectional conductor retainer in the inlet end
US7358448Mar 20, 2007Apr 15, 2008Bridgeport Fittings, Inc.Electrical connector assembly with frusto-conical snap fit retaining ring for enhancing electrical grounding of the connector assembly to an electrical box and installation tool therefor
US7488905Aug 8, 2006Feb 10, 2009Bridgeport Fittings, Inc.Electrical connector with outer retainer ring and internal unidirectional conductor retainer
US7645947Jan 12, 2010Bridgeport Fittings, Inc.Electrical connector with outer retainer ring and internal unidirectional conductor retainer
US7723623Jan 8, 2008May 25, 2010Bridgeport Fittings, Inc.Electrical duplex connector having an integrally formed connector body with a frustro-conical retaining ring and unidirectional cable retainers
US7820922May 5, 2008Oct 26, 2010Bridgeport Fittings, Inc.Electrical offset nipple connector with frustro-conical retaining rings
US7952034May 31, 2011Bridgeport Fittings, Inc.Strap type electrical connector with frustro-conical retaining ring and improved clamping strap for either nonmetallic cables or armor or metal clad cables
US8119933Feb 9, 2010Feb 21, 2012Bridgeport Fittings, Inc.Duplex electrical connector with frustro-conical retaining ring and crimped inlet end
US8143535Jan 30, 2009Mar 27, 2012Bridgeport Fittings, Inc.Electrical connector assembly with enhanced grounding
US8350163Jan 8, 2013Bridgeport, Fittings, Inc.Electrical connector having snap in frustro-conical retaining ring with improved conductivity
US20040166708 *Mar 1, 2004Aug 26, 2004Kiely Kenneth M.Snap fitting electrical connector
US20060054341 *Jun 13, 2005Mar 16, 2006Delbert AuraySnap fit electrical connector assembly with conical outer snap fit retainer and one or more internal snap fit wire retainers
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US20060141827 *Feb 28, 2006Jun 29, 2006Delbert AuraySnap fit electrical connector assembly with operating tool for facilitating the connection of a connector assembly to an electrical box
US20060180330 *Apr 7, 2006Aug 17, 2006Delbert AurayElectrical connector with snap fit retainer ring constructed to enhance the connection of the connector to an electrical box
US20060180331 *Apr 12, 2006Aug 17, 2006Delbert AuraySnap fit electrical connector assembly with outer frustro conical retainer ring and internal unidirectional snap fit wire conductor retainer
US20060289194 *Aug 8, 2006Dec 28, 2006Bridgeport Fittings, Inc.Electrical connector with outer retainer ring and internal unidirectional conductor retainer
US20070163804 *Mar 20, 2007Jul 19, 2007Bridgeport Fittings, Inc.Electrical connector assembly with frustro-conical snap fit retaining ring for enhancing electrical grounding of the connector assembly to an electrical box and installation tool therefor
US20080053680 *Sep 21, 2007Mar 6, 2008Bridgeport Fittings, Inc.Strap type electrical connector with frustro-conical retaining ring and improved clamping strap for either nonmetallic cables or armor or metal clad cables
US20080149388 *Jan 8, 2008Jun 26, 2008Bridgeport Fittings, Inc.Electrical duplex connector having an integrally formed connector body with a frustro-conical retaining ring and unidirectional cable retainers
US20080277160 *May 5, 2008Nov 13, 2008Bridgeport Fittings, Inc.Electrical offset nipple connector with frustro-conical retaining rings
US20090178845 *Jul 16, 2009Delbert AurayElectrical connector assembly with enhanced grounding
US20100163304 *Feb 9, 2010Jul 1, 2010Bridgeport Fittings, Inc.Duplex electrical connector with frustro-conical retaining ring and crimped inlet end
USD750570 *Oct 24, 2014Mar 1, 2016Bridgeport Fittings, Inc.Metal clad/armored clad electrical cable to electrical conduit transition fitting housing
USD751043 *Oct 24, 2014Mar 8, 2016Bridgeport Fittings, Inc.Metal clad/armored clad electrical cable to electrical enclosure electrical transition fitting housing
Classifications
U.S. Classification285/321, 285/154.1
International ClassificationH02G3/02, H02G3/06
Cooperative ClassificationH02G3/0616
European ClassificationH02G3/06C