US2862040A - Moisture-proof flanged hub type connector - Google Patents

Moisture-proof flanged hub type connector Download PDF

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US2862040A
US2862040A US560606A US56060656A US2862040A US 2862040 A US2862040 A US 2862040A US 560606 A US560606 A US 560606A US 56060656 A US56060656 A US 56060656A US 2862040 A US2862040 A US 2862040A
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bolt
housing wall
flange
moisture
gasket
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US560606A
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Louis J Curran
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
    • H02G3/02—Details
    • H02G3/06—Joints for connecting lengths of protective tubing or channels, to each other or to casings, e.g. to distribution boxes; Ensuring electrical continuity in the joint
    • H02G3/0616—Joints for connecting tubing to casing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B2200/00—Constructional details of connections not covered for in other groups of this subclass
    • F16B2200/60—Coupler sealing means

Definitions

  • My invention relates generally to connectors for connecting an electrical conduit to a housing wall, and more particularly to an improved connector of the flanged hub type.
  • connection moisture-proof Difiiculties arise, however, when it is desired to make the connection moisture-proof. If, in accordance with usual practice, a gasket approximately the same shape as the flange is placed between the face of the flange and the housing wall, the connection will leak moisture around the bolt holes. If, to prevent this, gaskets are placed around the ends of the bolts, continuity of the electrical I ground circuit between the conduit and the housing is interrupted because the gaskets act as insulators.
  • Fig. 1 is a perspective view of a housing with one embodiment of my invention attached to the top thereof;
  • Figure 2 is a partially sectioned side view of a preferred embodiment of my invention shown connecting an electrical conduit to a housing wall;
  • FIG 3 is an enlarged, perspective view of the bolt gasket shown in Figure 2;
  • Figure 4 is an enlarged, perspective view of the scarfing washer shown in Figure 2.
  • the numeral 10 indicates generally a flanged hub type connector having a hub 11 with a threaded bore 12 for receiving an electrical conduit 13.
  • An outwardly extending flange 14' is adjoined to one end of the hub 11 and has bolt holes 15 near its outer circumference for securing the connector to a housing wall 16.
  • the threads in the bore 12 have an inwardly convergent taper to provide a moisture-proof, ground circuit maintaining connection between the hub 11 and the conduit 13.
  • the bolt holes 15 have axes parallel to the axis of the bore 12 and a convergently tapered conical counterbore 17 at the end adjacent the hub.
  • bolts 18 are provided which fit through the bolt holes 15, and suitable openings in the housing wall 16 and are thereafter engaged by nuts 19. Thread tightening thenuts 19 onto the bolts 18 draws a face 20 of the flange 14 into engagement with the outside of the housing wall 16.
  • a face gasket 21 approximately the same shape as flange face 20 is provided for positioning between the flange face 20 and housing wall 16.
  • This gasket forms a moistureproof seal around the circumference of the flange 14, but does not prevent leakage of moisture through bolt holes 15.
  • bolt gaskets 22 are provided. These gaskets 22 have an internal bore 23 large enough to snugly receive the shank portion of bolts 18, and a conically tapered outer surface 24 adapted to seat in counterbore 17 in such manner that a small portion 25 of the outer end protrudes from the counterbores.
  • annual washers 26 are provided, which have scarfing teeth 27 attached at their periphery and positioned approximately perpendicular to the body of the washer. Two of these washers are located on the shank of each of the bolts 18, one between the bolt head and the bolt gasket 22, and a second adjacent the nuts 19.
  • the outer circumference of the washers 26 is larger than the maximum outer surface diameter of the gaskets 22 so that on the washers positioned adjacent the bolt heads the scarfing teeth 27, which are directed towards the flange 14, extend over the protruding portion 25 of these gaskets to engage the surface of the flange.
  • the scarfing teeth 27 on the washers adjacent the nuts 19 are directed toward the housing wall 16 to engage its inner surface.
  • an electrical conduit 13 is threaded into the bore 12 in such a manner as to give a moistureproof, electrically-grounded connection as previously described.
  • the connector 10 is then secured to the housing wall 16 by fitting bolts 18 through the bolt holes 15 in flange 14 and thereafter passing the bolts through suitable openings in the housing wall for engagement by the nuts 19.
  • the face gasket 21 is compressed between flange face 20 and housing wall 16 and bolt gaskets 22 are compressed between the heads of bolts 18 and counterbores 17.
  • a moisture-proof connection is thereby established between the electrical conduit 13 and the housing wall 16. Thread tightening the nuts 19 on bolts 13 also forces scarfing teeth 27 on the washers 26 into the surfaces of the flange and housing wall, thereby establishing an effective electrical grounding connection between the electrical conduit 13 and housing wall 16.
  • a connector for connecting an electrical conduit to a housing wall comprising: a hub having an inwardly convergent, taper threaded bore for receiving anelectrical conduit, thereby establishing a moisture-proof, electrically-grounded connection between said hub andsaid electrical conduit; an outwardly extending flange on one endof said hub having a face surface perpendicular to the axis of said bore for engaging a housing wall; means defining holes near the outer circumference of said flange, said holes having an inwardly convergent conical seating surface at the end adjacent said hub; a bolt and nut for passing through said hole and securing said flange to said housing wall; a conically tapered bolt gasket having an axial bore for snugly receiving the shank of said bolt, and a conically tapered outer surface for engaging said seating surface, said gasket thereby providing a moisture-proof seal between said bolt and said seating surface when compressed therebetween; an annular face gasket having an outer circumference shaped similarly to the outer circumference of said
  • a connector for connecting an electrical conduit to a housing wall comprising: a hub for receiving a conduit; means for establishing a moisture-proof, electricallygrounded connection between said hub and said conduit; a flange on said hub having a bolt hole therethrough, said bolt hole having a conically tapered seating surface; a bolt extending through said bolt hole and having a nut for securing said flange to a housing wall; a bolt gasket mounted on said bolt having a surface generally complementary to said seating surface, and thereby providing a moisture-proof seal between said bolt and said seating surface when compressed therebetween; a face gasket positioned to be compressed between said flange and said housing wall, thereby forming, in conjunction with said bolt gasket, a moisture-proof seal between said flange and said housing wall when said flange is secured to said housing wall by said bolt and nut; a first washer mounted on said bolt adjacent the head thereof and having a periphery greater than said bolt gasket with scarfing teeth which extend over said bolt gasket for engaging and scarfing
  • a connector for joining electrical conduit to a housing wall having a hole therein including: a hub for receiving a conduit therein; a flange extending radially from an end of said hub and having a hole therethrough, said hole having a tapered enlargement forming a seat at one end thereof; bolt means extending through said hole; a resilient deformable gasket mounted on said bolt and having an external surface generally complementary to said tapered seat and extending outward therebeyond; a washer mounted on said bolt between said gasket and an end thereof, and extending beyond the periphery of said gasket; scarfing teeth on said washer positioned to engage the surface of said flange; means associated with said bolt means to secure said flange to said housing wall, compress said gasket into fluid tight engagement with said bolt and seat and bring said scarfing teeth into engagement with said flange; and scarfing means operatively associated with said securing means for making electrical contact between said bolt and said housing wall.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Installation Of Indoor Wiring (AREA)

Description

Nov. 25, 1958 L. J. CURRAN MOISTURE-PROOF FLANGED HUB TYPE CONNECTOR F iled Jan. 25, 1956 5 N U m MM MM M6 4 [J w u I 0 Z Y B M United States atent Oflfice 2,862,040 Patented Nov. 25, 1958 MOISTURE-PROOF FLANGED HUB TYPE CONNECTOR Louis J. Curran, Los Angeles, Calif.
Application January 23, 1956, Serial No. 560,606
3 Claims. (Cl. 174-51) My invention relates generally to connectors for connecting an electrical conduit to a housing wall, and more particularly to an improved connector of the flanged hub type.
In electrical wiring, the practice of using a flanged hub type connector for connecting electrical conduits to housings such as switch boxes, connection boxes, electrical cabinets and the like, is well known. The conduit is threaded into the hub end of the connector and the connector flange is then bolted to the housing wall. Such a connection is easy to perform and inexpensive.
Difiiculties arise, however, when it is desired to make the connection moisture-proof. If, in accordance with usual practice, a gasket approximately the same shape as the flange is placed between the face of the flange and the housing wall, the connection will leak moisture around the bolt holes. If, to prevent this, gaskets are placed around the ends of the bolts, continuity of the electrical I ground circuit between the conduit and the housing is interrupted because the gaskets act as insulators.
Efforts have been made to avoid these difficulties by providing outward extrusions around the openings in the housing wall so that upon tightening of the connector bolts, a seal is formed between the flange face and the extrusions which minimizes moisture leakage and still maintains the electrical ground circuit. This process is costly and not entirely satisfactory.
Accordingly, it is a major object of my invention to provide an improved flanged hub type connector with means for forming a moisture-proof connection and still maintaining continuity of the electrical ground circuit. It is another object of my invention to provide means for forming such a connection which obviate the necessity of providing extrusions around openings in the housing wall.
It is a further object of my invention to provide means for forming such a connection which may be incorporated into a standard flanged hub type connector with a minimum of modifications.
It is still another object of my invention to provide means for making such a connection which are easier to use and less expensive than previous methods.
These and other objects and advantages of my invention will be apparent from the following detailed description thereof, and from an inspection of the accompanying drawings, in which:
Fig. 1 is a perspective view of a housing with one embodiment of my invention attached to the top thereof;
Figure 2 is a partially sectioned side view of a preferred embodiment of my invention shown connecting an electrical conduit to a housing wall;
Figure 3 is an enlarged, perspective view of the bolt gasket shown in Figure 2; and
Figure 4 is an enlarged, perspective view of the scarfing washer shown in Figure 2.
Referring now to the drawings, and particularly to Figure 2 thereof, the numeral 10 indicates generally a flanged hub type connector having a hub 11 with a threaded bore 12 for receiving an electrical conduit 13. An outwardly extending flange 14'is adjoined to one end of the hub 11 and has bolt holes 15 near its outer circumference for securing the connector to a housing wall 16. The threads in the bore 12 have an inwardly convergent taper to provide a moisture-proof, ground circuit maintaining connection between the hub 11 and the conduit 13. The bolt holes 15 have axes parallel to the axis of the bore 12 and a convergently tapered conical counterbore 17 at the end adjacent the hub.
To secure the connector 10 to the housing wall 16, bolts 18 are provided which fit through the bolt holes 15, and suitable openings in the housing wall 16 and are thereafter engaged by nuts 19. Thread tightening thenuts 19 onto the bolts 18 draws a face 20 of the flange 14 into engagement with the outside of the housing wall 16.
In order to make the connection between the connector 10 and the housing wall 16 moisture-proof, a face gasket 21 approximately the same shape as flange face 20 is provided for positioning between the flange face 20 and housing wall 16. This gasket forms a moistureproof seal around the circumference of the flange 14, but does not prevent leakage of moisture through bolt holes 15. For this purpose, bolt gaskets 22 are provided. These gaskets 22 have an internal bore 23 large enough to snugly receive the shank portion of bolts 18, and a conically tapered outer surface 24 adapted to seat in counterbore 17 in such manner that a small portion 25 of the outer end protrudes from the counterbores. When the gaskets 22 are engaged by the heads of bolts 18 and deformably compressed against the conical seating surface of the counterbore 17, they are entrapped between the bolt shanks and the seating surface thereby forming an effective seal between the bolts and the flange. The protruding portions 25 expand over the outer rim of the counterbore 17 aiding in the seal.
To maintain continuity of the electrical ground circuit, annual washers 26 are provided, which have scarfing teeth 27 attached at their periphery and positioned approximately perpendicular to the body of the washer. Two of these washers are located on the shank of each of the bolts 18, one between the bolt head and the bolt gasket 22, and a second adjacent the nuts 19. The outer circumference of the washers 26 is larger than the maximum outer surface diameter of the gaskets 22 so that on the washers positioned adjacent the bolt heads the scarfing teeth 27, which are directed towards the flange 14, extend over the protruding portion 25 of these gaskets to engage the surface of the flange. The scarfing teeth 27 on the washers adjacent the nuts 19 are directed toward the housing wall 16 to engage its inner surface.
In operation, an electrical conduit 13 is threaded into the bore 12 in such a manner as to give a moistureproof, electrically-grounded connection as previously described. The connector 10 is then secured to the housing wall 16 by fitting bolts 18 through the bolt holes 15 in flange 14 and thereafter passing the bolts through suitable openings in the housing wall for engagement by the nuts 19. When the nuts are tightened onto the bolts, the face gasket 21 is compressed between flange face 20 and housing wall 16 and bolt gaskets 22 are compressed between the heads of bolts 18 and counterbores 17. A moisture-proof connection is thereby established between the electrical conduit 13 and the housing wall 16. Thread tightening the nuts 19 on bolts 13 also forces scarfing teeth 27 on the washers 26 into the surfaces of the flange and housing wall, thereby establishing an effective electrical grounding connection between the electrical conduit 13 and housing wall 16.
While I have shown and described a preferred form of my invention, it is obvious that changes may be made therein. For this reason I do not wish to be limited to the particular form or arrangement of parts herein described and shown, but rather to the scope of the appended claims.
Iclaim:
l. A connector for connecting an electrical conduit to a housing wall comprising: a hub having an inwardly convergent, taper threaded bore for receiving anelectrical conduit, thereby establishing a moisture-proof, electrically-grounded connection between said hub andsaid electrical conduit; an outwardly extending flange on one endof said hub having a face surface perpendicular to the axis of said bore for engaging a housing wall; means defining holes near the outer circumference of said flange, said holes having an inwardly convergent conical seating surface at the end adjacent said hub; a bolt and nut for passing through said hole and securing said flange to said housing wall; a conically tapered bolt gasket having an axial bore for snugly receiving the shank of said bolt, and a conically tapered outer surface for engaging said seating surface, said gasket thereby providing a moisture-proof seal between said bolt and said seating surface when compressed therebetween; an annular face gasket having an outer circumference shaped similarly to the outer circumference of said flange, and being positioned to be compressed between said face surface and said housing wall thereby establishing, in conjunction With said bolt gasket, a moisture-proof seal between said flange and said housing wall when said bolt and nut are tightened to secure said flange to said housing wall; a first annular washer having a periphery greater than the periphery of said bolt gasket with scarfing teeth projecting therefrom at an angle approximately parallel to its longitudinal axis, said washer being mounted on said bolt shank in limiting engagement with said bolt head and between said bolt head and said bolt gasket with said scarfing teeth positioned to project over the periphery of said bolt gasket and to engage and scarf the outer surface of said flange when said bolt and nut are tightened to secure said flange to said housing wall; and a second annular washer similar to said first washer mounted on said bolt shank adjacent said nut with scarfing teeth positioned to engage and scarf the inner surface of said housing wall when said bolt and nut are tightened to secure said flange to said housing wall; said first and second Washers thereby forming an effective electn'cal ground connection between said flange and said housing wall through said bolt.
2. A connector for connecting an electrical conduit to a housing wall comprising: a hub for receiving a conduit; means for establishing a moisture-proof, electricallygrounded connection between said hub and said conduit; a flange on said hub having a bolt hole therethrough, said bolt hole having a conically tapered seating surface; a bolt extending through said bolt hole and having a nut for securing said flange to a housing wall; a bolt gasket mounted on said bolt having a surface generally complementary to said seating surface, and thereby providing a moisture-proof seal between said bolt and said seating surface when compressed therebetween; a face gasket positioned to be compressed between said flange and said housing wall, thereby forming, in conjunction with said bolt gasket, a moisture-proof seal between said flange and said housing wall when said flange is secured to said housing wall by said bolt and nut; a first washer mounted on said bolt adjacent the head thereof and having a periphery greater than said bolt gasket with scarfing teeth which extend over said bolt gasket for engaging and scarfing said flange when said flange is secured to said housing wall by said bolt and nut; and a second washer mounted on said bolt adjacent said nut with scarfing teeth positioned for engaging and scarfing said housing wall when said flange is secured to said housing wall by said bolt and nut; said washers thereby forming an effective electrical connection between said housing wall and said flange through said bolt.
3. A connector for joining electrical conduit to a housing wall having a hole therein, including: a hub for receiving a conduit therein; a flange extending radially from an end of said hub and having a hole therethrough, said hole having a tapered enlargement forming a seat at one end thereof; bolt means extending through said hole; a resilient deformable gasket mounted on said bolt and having an external surface generally complementary to said tapered seat and extending outward therebeyond; a washer mounted on said bolt between said gasket and an end thereof, and extending beyond the periphery of said gasket; scarfing teeth on said washer positioned to engage the surface of said flange; means associated with said bolt means to secure said flange to said housing wall, compress said gasket into fluid tight engagement with said bolt and seat and bring said scarfing teeth into engagement with said flange; and scarfing means operatively associated with said securing means for making electrical contact between said bolt and said housing wall.
References Cited in the file of this patent UNITED STATES PATENTS 2,097,713 Ashley Nov. 2, 1937 2,179,476 Andrus Nov. 14, 1939 2,235,429 Henry Mar. 18, 1941 2,454,897 Trowbridge Nov. 30, 1948 2,476,074 Unger July 12, 1949 2,503,169 Phillips Apr. 4, 1950 2,508,655 Silverrnan May 23, 1950 2,597,081 Goodhue May 20, 1952 2,778,868 Stinger Jan. 22, 1957 2,783,295 Ewing Feb. 26', 1957
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US3387814A (en) * 1966-10-27 1968-06-11 Wilbur E. Fischer Component mounting clamp
US3910608A (en) * 1974-10-07 1975-10-07 Unicorn Ind Fitting for connecting electrical conduit to a junction box
US4174876A (en) * 1977-06-14 1979-11-20 Olympus Optical Co., Ltd. Mounting mechanism for enclosure
US4249758A (en) * 1978-08-25 1981-02-10 Robert H. Harris Company, Inc. Ductwork connecting
US4459119A (en) * 1981-02-23 1984-07-10 Gene Beijer Lock washer for spring type retainer rings
US4496791A (en) * 1982-10-13 1985-01-29 Allen-Bradley Company Spring-biased connector for electrically bonding a device to a supporting wall
US4561796A (en) * 1980-11-10 1985-12-31 Toyota Jidosha Kabushiki Kaisha Tamperproof clamping construction with block wedged in slot
US4695030A (en) * 1985-09-03 1987-09-22 Fischer Jay P Quick release clamp
US5921589A (en) * 1997-09-29 1999-07-13 The United States Of America As Represented By The Secretary Of The Navy Vibration isolating flange assembly
US20050044405A1 (en) * 2000-05-11 2005-02-24 Spraggs Lynn D. System and method of securing a computer from unauthorized access
US20070070586A1 (en) * 2005-08-03 2007-03-29 Leo Mazur Nonmetallic raintight hub
US7306418B2 (en) * 2004-09-27 2007-12-11 General Motors Corporation Deforming member and captive fastener retaining method
USD612564S1 (en) * 2007-10-09 2010-03-23 Comley John J Pallet jack stop
US20110255913A1 (en) * 2010-04-19 2011-10-20 Dataonline Intellectual Property, Lp Telemetry system adaptation for non-telemetry equipped sensors
US20150016918A1 (en) * 2013-07-11 2015-01-15 GM Global Technology Operations LLC Elastically averaged alignment systems and methods
US9061403B2 (en) 2011-07-21 2015-06-23 GM Global Technology Operations LLC Elastic tube alignment system for precisely locating an emblem lens to an outer bezel
US9061715B2 (en) 2012-08-09 2015-06-23 GM Global Technology Operations LLC Elastic cantilever beam alignment system for precisely aligning components
US9067625B2 (en) 2013-04-09 2015-06-30 GM Global Technology Operations LLC Elastic retaining arrangement for jointed components and method of reducing a gap between jointed components
US9067379B2 (en) 2012-04-28 2015-06-30 GM Global Technologies Operations LLC Stiffened multi-layer compartment door assembly utilizing elastic averaging
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US9243655B2 (en) 2013-06-13 2016-01-26 GM Global Technology Operations LLC Elastic attachment assembly and method of reducing positional variation and increasing stiffness
US9278642B2 (en) 2013-04-04 2016-03-08 GM Global Technology Operations LLC Elastically deformable flange locator arrangement and method of reducing positional variation
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US2235429A (en) * 1939-06-28 1941-03-18 Henrite Products Corp Electrical connection for hermetically sealed units
US2508655A (en) * 1945-07-23 1950-05-23 T & M Mfg Company Clamping connector
US2476074A (en) * 1945-09-17 1949-07-12 Gen Electric Plug
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US2503169A (en) * 1946-12-13 1950-04-04 Walter E Phillips Hose coupling
US2597081A (en) * 1948-09-09 1952-05-20 Polytechnic Res And Dev Compan Joint for wave guides
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Cited By (58)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3387814A (en) * 1966-10-27 1968-06-11 Wilbur E. Fischer Component mounting clamp
US3910608A (en) * 1974-10-07 1975-10-07 Unicorn Ind Fitting for connecting electrical conduit to a junction box
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