US3857136A - Cable bushing apparatus - Google Patents

Cable bushing apparatus Download PDF

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Publication number
US3857136A
US3857136A US00376969A US37696973A US3857136A US 3857136 A US3857136 A US 3857136A US 00376969 A US00376969 A US 00376969A US 37696973 A US37696973 A US 37696973A US 3857136 A US3857136 A US 3857136A
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Prior art keywords
frame
protrusion
means defining
cable bushing
central portion
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Expired - Lifetime
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US00376969A
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C Dean
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Hutchinson Aerospace and Industry Inc
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Barry Wright Corp
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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
    • H02G3/08—Distribution boxes; Connection or junction boxes
    • H02G3/081—Bases, casings or covers
    • H02G3/083—Inlets
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00—Insulators or insulating bodies characterised by their form
    • H01B17/26—Lead-in insulators; Lead-through insulators

Definitions

  • the present invention relates to a cable bushing and more particularly concerns a cable bushing including a conduitlike hollow plastic insert for covering an opening in the metal wall of a desk or cabinet.
  • the plastic insert includes a panel whose sides may be easily separated from the rest of the insert with the tip of a knife to remove the panel or let it function as a door hinged on one side.
  • the invention not only protects cables but attractively covers otherwise unsightly holes not then accommodating cables.
  • cable bushing apparatus comprises a frame surrounding a central portion. Both the frame and central portion are of coplanar sheet form and preferably of molded plastic construction.
  • An elongated spacing path separates the frame and central portion. The path is more than half filled with thin section, elongated strips uniformly spaced along the path length. Selected strips may be cut so that the remaining strips serve as a hinge for the central portion. Alternatively, all the strips may be cut for removal of the central portion.
  • the strips thus comprise means for removably and hingeably supporting the central portion, the thin strips being breakable with the tip of a knife and sufficiently flexible to function as a hinge when the central portion is otherwise free to move and may then function as a hinged door.
  • a protruding wall extends from the frame orthogonally to the common plane of the frame and central portion.
  • the protruding wall conforms to the metal panel hole in which the apparatus is to be mounted.
  • a plurality of yieldable tabs are arrayed along the outer surface of the protruding wall and spaced from the frame by a distance corresponding to metal panel thickness.
  • the protruding wall is passed through a hole in the metal panel until the frame seats against the panel. The tabs and frame then define multiple spaced pairs of jaws gripping the panel.
  • Decorative or identifying patterns may be impressed on the surface of the central portion by change of height and/or surface finish therein.
  • the apparatus provides decorative cover to unused metal panel holes and a safety grommet with an optional hinged door to the used holes.
  • the central portion is convertible to its door function or wholly removable reliably and without use of special tools.
  • FIGS. 1 and 4 are plan and front views, respectively, of a cable bushing according to a preferred embodiment of the invention.
  • FIGS. 2 and 3 are sectional views of the bushing along sections 2-2 and 3-3, respectively, of FIG. 1.
  • FIG. 1 there is shown a cable bushing 10 according to a preferred embodiment of the invention made in rectangular form and comprising a rectangular frame 12 surrounding a central rectangular portion 14.
  • a thin gap 16 spaces portions 12 and 14 from each other and the gap is filled in part with spaced flexible strips 18, alternating with gaps such as 20 located at the corners of the apparatus.
  • the central portion 14 comprises a raised ridge 22 around its outer edge and a label portion 24 therein.
  • the label writing is preferably formed as raised projection(s) such as 26 on the label portion 24.
  • the label portion 24 and balance of central portion 14 preferably have contrasting textures, one being embossed or matte surfaced and the other being smooth, for example.
  • a rectangular frame protrusion 28 depends from frame 12.
  • the protrusion comprises four spaced cutouts 30 with yieldable tabs 32 therein formed integrally with the protrusion. These tabs have a thicker cross section than the protrusion and slope outwardly from the protrusion wall at an angle A of 4080, preferably Reinforcing bumps 34 are provided around the protrusion 28 just below frame 12.
  • the cable bushing apparatus may be mounted in a wall panel by cutting a hole conforming to the depend ing protrusion 28 of the bushing in the panel and sliding the protrusion through the hole.
  • Tabs 32 yield inwardly to allow passage of the protrusion and then snap out to form a grip on the back face of the wall panel while frame 12 grips the front face.
  • Bumps 34 span the slight gap from the protrusion 28 to the wall and are compressed within such gaps to stabilize the cable bushing and prevent wobbling thereof.
  • the remaining firmly secured frame 12 serves as a protective and decorative grommet sealing the edge of the panel hole from cable which passes centrally through it.
  • the cable bushing may be made by injection molding a thermo-plastic material, preferably polypropylene,
  • Cable bushing apparatus comprising,
  • said thin strips being breakable with the tip of a knife and sufficiently flexible to function as a hinge when said central portion is otherwise free to move and may then function as a hinged door
  • said frame and central removable portion defining a common plane and said protrusion being arranged orthogonally to said common plane.
  • said central portion is wholly surrounded by said frame
  • said frame to central portion spacing is an elongated path with at least half the length thereoffilled with said spanning strips.
  • said spanning strips are uniformly spaced from each other.
  • said tabs being contained within said protrusion cutouts.
  • Cable bushing apparatus in accordance with claim and further comprising;
  • said protrusion being on the second side of said plane

Abstract

Electric wire and cables are accommodated in metal panel furniture by cutting a hole through a metal panel and inserting a cable bushing to protect cables from the cut edge of the hole. The bushing comprises a frame surrounding a central removable portion in the plane of the panel and a protrusion orthogonal to said plane extending through the hole. Yieldable tabs in the protrusion, cooperate with the frame to define multiple spaced pairs of panel grip jaws. Spaced thin strips mount the central portion within the frame and are selectively severable to convert the central portion into a hinged door or to remove the portion.

Description

United States Patent 1 [111 3,857,136
Dean Dec. 31, 1974 r [54] CABLE BUSHING APPARATUS Prima ExaminerPaul R. Gilliam 75 I t Carl Dean Southbrid Mass. 1 men or J ge Assistant Examiner-Dons L. Troutman Assigneei yg p n, Attorney, Agent, or Firm--Milton E. Gilbert Watertown, Mass.
[22] Filed: July 6, 1973 [57] ABSTRACT [2]] A l N 376,969 Electric wire and cables are accommodated in metal panel furniture by cutting a hole through a metal panel and inserting a cable bushing to protect cables UoSn a Ilrt. a frame Surrounding a central removable portion in [58] Fleld of Search 16/2, 128, 150, 1 9/ G, the plane of the panel and a protrusion orthogonal to 174/152 220/27 248/56 said plane extending through the hole. Yieldable tabs in the protrusion, cooperate with the frame to define [56] References cued multiple spaced pairs of panel grip jaws. Spaced thin UNITED STATES PATENTS strips mount the central portion within the frame and 2,312,358 3/1943 Punte 220/27 are selectively severable to convert the central portion 2,959,633 11/1960 Palmer et al 220/3.94 into a hinged door or to remove the portion. 3,690,50l 9/1972 Ware 220/3.94 3,770,873 11/1973 Brown 220/27 5 Chums, 4 Drawmg Flgoros PATENTEI] UEE3 1 I974 sum 2 or 2 CABLE BUSHING APPARATUS BACKGROUND OF THE INVENTION The present invention relates to a cable bushing and more particularly concerns a cable bushing including a conduitlike hollow plastic insert for covering an opening in the metal wall of a desk or cabinet. The plastic insert includes a panel whose sides may be easily separated from the rest of the insert with the tip of a knife to remove the panel or let it function as a door hinged on one side. The invention not only protects cables but attractively covers otherwise unsightly holes not then accommodating cables.
It is an important object of the invention to provide a bushing for protecting wires and cables passing through a metal panel hole.
It is a further object of the invention to provide a bushing having an integrally formed hole cover consistent with the preceding object.
It is a further object of the invention to provide an easily inserted bushing consistent with one or more of the preceding objects.
It is a further object of the invention to provide a hinged, door openable in several directions consistent with one or more of the preceding objects.
It is a further object of the invention to provide an esthetically pleasing structure consistent with one or more of the preceding objects that covers otherwise unsightly holes not then accommodating cables.
It is a further object of the invention to provide a low cost structure consistent with one or more of the preceding objects.
SUMMARY OF THE INVENTION According to the invention, cable bushing apparatus comprises a frame surrounding a central portion. Both the frame and central portion are of coplanar sheet form and preferably of molded plastic construction. An elongated spacing path separates the frame and central portion. The path is more than half filled with thin section, elongated strips uniformly spaced along the path length. Selected strips may be cut so that the remaining strips serve as a hinge for the central portion. Alternatively, all the strips may be cut for removal of the central portion. The strips thus comprise means for removably and hingeably supporting the central portion, the thin strips being breakable with the tip of a knife and sufficiently flexible to function as a hinge when the central portion is otherwise free to move and may then function as a hinged door.
A protruding wall extends from the frame orthogonally to the common plane of the frame and central portion. The protruding wall conforms to the metal panel hole in which the apparatus is to be mounted. A plurality of yieldable tabs are arrayed along the outer surface of the protruding wall and spaced from the frame by a distance corresponding to metal panel thickness. The protruding wall is passed through a hole in the metal panel until the frame seats against the panel. The tabs and frame then define multiple spaced pairs of jaws gripping the panel.
Decorative or identifying patterns may be impressed on the surface of the central portion by change of height and/or surface finish therein.
The apparatus provides decorative cover to unused metal panel holes and a safety grommet with an optional hinged door to the used holes. The central portion is convertible to its door function or wholly removable reliably and without use of special tools.
These and other objects, features and advantages of the invention will become apparent from the following detailed description when read with the accompanying drawing in which:
BRIEF DESCRIPTION OF THE DRAWING FIGS. 1 and 4 are plan and front views, respectively, of a cable bushing according to a preferred embodiment of the invention; and
FIGS. 2 and 3 are sectional views of the bushing along sections 2-2 and 3-3, respectively, of FIG. 1.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS Referring now to the drawing and more particularly FIG. 1 thereof, there is shown a cable bushing 10 according to a preferred embodiment of the invention made in rectangular form and comprising a rectangular frame 12 surrounding a central rectangular portion 14. A thin gap 16 spaces portions 12 and 14 from each other and the gap is filled in part with spaced flexible strips 18, alternating with gaps such as 20 located at the corners of the apparatus.
The central portion 14 comprises a raised ridge 22 around its outer edge and a label portion 24 therein. The label writing is preferably formed as raised projection(s) such as 26 on the label portion 24. The label portion 24 and balance of central portion 14 preferably have contrasting textures, one being embossed or matte surfaced and the other being smooth, for example.
Referring now to the front view of FIG. 4 and the sectional views of FIGS. 2 and 3 along sections 2--2 and 3-3, respectively, of FIG. 1, a rectangular frame protrusion 28 depends from frame 12. The protrusion comprises four spaced cutouts 30 with yieldable tabs 32 therein formed integrally with the protrusion. These tabs have a thicker cross section than the protrusion and slope outwardly from the protrusion wall at an angle A of 4080, preferably Reinforcing bumps 34 are provided around the protrusion 28 just below frame 12.
It will be understood that round, square or other shapes may be used in lieu of the above described rectangular frame and/or protrusion shapes.
The cable bushing apparatus may be mounted in a wall panel by cutting a hole conforming to the depend ing protrusion 28 of the bushing in the panel and sliding the protrusion through the hole. Tabs 32 yield inwardly to allow passage of the protrusion and then snap out to form a grip on the back face of the wall panel while frame 12 grips the front face. Bumps 34 span the slight gap from the protrusion 28 to the wall and are compressed within such gaps to stabilize the cable bushing and prevent wobbling thereof.
After installation, three of the four strips 18 may be cut with a knife, leaving the remaining strip 18 as a hinge and the central portion 14 as a hinged door. Alternatively, the fourth strip 18 may also be cut and portion 14 removed. In either case, the remaining firmly secured frame 12 serves as a protective and decorative grommet sealing the edge of the panel hole from cable which passes centrally through it.
The cable bushing may be made by injection molding a thermo-plastic material, preferably polypropylene,
and preferred dimensions for the above described portions thereof are:
for the thickness of frame 12 .095 v105 in. for the thickness of strips 18 .0l .025 in. for the thickness of portion l4 .055 .065 in. for the thickness of protrusion 28 .045 .055 in. maximum thickness of tabs 32 .125 I35 in. added thickness of bumps 34 .0l0 020 in.
Other dimensional relationships and scales may be used to accomplish the same purposes of ease of entry and stable holding of the bushing, consistent with ease of selective removal of one or more or all of strips 18 to provide a door opening in a desired direction or complete removal of central portion 14.
It is evident that those skilled in the art, once given the benefit of the foregoing disclosure, may now make numerous other uses and modifications of, and departures from the specific embodiments described herein without departing from the inventive concepts. Consequently, the invention is to be construed as embracing each and every novel feature and novel combination of features present in, or possessed by, the apparatus and techniques herein disclosed and limited solely by the scope and spirit of the appended claims.
What is claimed is:
1. Cable bushing apparatus comprising,
means defining a frame,
means defining a central removable portion at least partially enclosed by said frame and spaced therefrom,
means defining a plurality of thin strips spanning the distance from the frame to said central removable portion for removably and hingeably supporting said central portion,
said thin strips being breakable with the tip of a knife and sufficiently flexible to function as a hinge when said central portion is otherwise free to move and may then function as a hinged door,
means defining an elongated protrusion of the frame coextensive therewith,
and means defining a plurality of yieldable tabs along an outer surface of said protrusion arranged adjacent to said frame to define multiple pairs of panel gripping jaws,
said frame and central removable portion defining a common plane and said protrusion being arranged orthogonally to said common plane.
2. Cable bushing apparatus in accordance with claim wherein;
said central portion is wholly surrounded by said frame,
and said frame to central portion spacing is an elongated path with at least half the length thereoffilled with said spanning strips.
3. Cable bushing apparatus in accordance with claim wherein;
said spanning strips are uniformly spaced from each other.
4. Cable bushing apparatus in accordance with claim and further comprising;
means defining an array of cutouts in said protrusion,
and means defining an array of bumps along the outer surface of said protrusion aligned with said cutouts,
said tabs being contained within said protrusion cutouts.
5. Cable bushing apparatus in accordance with claim and further comprising;
means defining a ridge on a first side of said plane,
said protrusion being on the second side of said plane,
and means defining areas of different surface finish on said first surface with said ridge forming a boundary line between said areas.

Claims (5)

1. Cable bushing apparatus comprising, means defining a frame, means defining a central removable portion at least partially enclosed by said frame and spaced therefrom, means defining a plurality of thin strips spanning the distance from the frame to said central removable portion for removably and hingeably supporting said central portion, said thin strips being breakable with the tip of a knife and sufficiently flexible to function as a hinge when said central portion is otherwise free to move and may then function as a hinged door, means defining an elongated protrusion of the frame coextensive therewith, and means defining a plurality of yieldable tabs along an outer surface of said protrusion arranged adjacent to said frame to define multiple pairs of panel gripping jaws, said frame and central removable portion defining a common plane and said protrusion being arranged orthogonally to said common plane.
2. Cable bushing apparatus in accordance with claim 1 wherein; said central portion is wholly surrounded by said frame, and said frame to central portion spacing is an elongated path with at least half the length thereof filled with said spanning strips.
3. Cable bushing apparatus in accordance with claim 2 wherein; said spanning strips are uniformly spaced from each other.
4. Cable bushing apparatus in accordance with claim 1 and further comprising; means defining an array of cutouts in said protrusion, and means defining an array of bumps along the outer surface of said protrusion aligned with said cutouts, said tabs being contained within said protrusion cutouts.
5. Cable bushing apparatus in accordance with claim 1 and further comprising; means defining a ridge on a first side of said plane, said protrusion being on the second side of said plane, and means defining areas of different surface finish on said first surface with said ridge forming a boundary line between said areas.
US00376969A 1973-07-06 1973-07-06 Cable bushing apparatus Expired - Lifetime US3857136A (en)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4730363A (en) * 1986-09-17 1988-03-15 Illinois Tool Works, Inc. Wiring grommet with retractable lid
US5050267A (en) * 1990-08-31 1991-09-24 Quest Thomas A Electrical cable access grommet
US5429431A (en) * 1992-08-10 1995-07-04 Hon Industries Inc. Wire management system and asssemblies therefor
US5777274A (en) * 1995-03-28 1998-07-07 Sumitomo Wiring Systems, Ltd Grommet having an identifying portion for checking the grommet
US6000918A (en) * 1997-11-10 1999-12-14 Yu; Jack Electric wire protecting device for ceiling fan having protective grommets and temperature detecting breaker
US6393658B1 (en) * 1999-01-29 2002-05-28 The Marvel Group, Inc. Cable port grommet for modular office furniture
US20040123420A1 (en) * 1992-06-22 2004-07-01 Mockett Douglas A.J. Grommet
US20060185875A1 (en) * 2003-03-27 2006-08-24 Martin Habel Cable leadthrough device
US20070175125A1 (en) * 2006-01-10 2007-08-02 Specified Technologies Inc. Apparatus for adjustably retaining and sealing pathway conduits mounted extending through a wall panel
US20090139743A1 (en) * 2007-12-04 2009-06-04 Bridgeport Fittings, Inc. Wire/cable identification device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2312358A (en) * 1941-02-25 1943-03-02 Continental Can Co Metal container for beverages
US2959633A (en) * 1959-05-12 1960-11-08 Union Insulating Co Inc Molded plastic outlet boxes with concealed knockouts
US3690501A (en) * 1969-12-29 1972-09-12 Ware Fuse Corp Electrical outlet box
US3770873A (en) * 1971-11-17 1973-11-06 Electrical Fittings Corp Plastic electrical junction box

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2312358A (en) * 1941-02-25 1943-03-02 Continental Can Co Metal container for beverages
US2959633A (en) * 1959-05-12 1960-11-08 Union Insulating Co Inc Molded plastic outlet boxes with concealed knockouts
US3690501A (en) * 1969-12-29 1972-09-12 Ware Fuse Corp Electrical outlet box
US3770873A (en) * 1971-11-17 1973-11-06 Electrical Fittings Corp Plastic electrical junction box

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4730363A (en) * 1986-09-17 1988-03-15 Illinois Tool Works, Inc. Wiring grommet with retractable lid
US5050267A (en) * 1990-08-31 1991-09-24 Quest Thomas A Electrical cable access grommet
US6877184B2 (en) 1992-06-22 2005-04-12 Douglas A. J. Mockett Grommet
US20060123591A1 (en) * 1992-06-22 2006-06-15 Mockett Douglas A Wire management grommet with non-captive closure member and sleeve
US20080178421A1 (en) * 1992-06-22 2008-07-31 Mockett Douglas A J Wire management grommet with non-captive closure member
US7788766B2 (en) 1992-06-22 2010-09-07 Mockett Douglas A J Wire management grommet with non-captive closure member
US20070077796A1 (en) * 1992-06-22 2007-04-05 Mockett Douglas A Wire management grommet with non-captive closure member
US20040123420A1 (en) * 1992-06-22 2004-07-01 Mockett Douglas A.J. Grommet
US7383610B2 (en) 1992-06-22 2008-06-10 Mockett Douglas A J Wire management grommet with non-captive closure member
US20050084226A1 (en) * 1992-06-22 2005-04-21 Mockett Douglas A.J. Wire management grommet with non-captive closure member
US20050081328A1 (en) * 1992-06-22 2005-04-21 Mockett Douglas A. Wire management grommet with non-captive closure member and sleeve
US7155775B2 (en) 1992-06-22 2007-01-02 Mockett Douglas A J Wire management grommet with non-captive closure member
US7124468B2 (en) 1992-06-22 2006-10-24 Mockett Douglas A J Wire management grommet with non-captive closure member and sleeve
US20060196005A1 (en) * 1992-06-22 2006-09-07 Mockett Douglas A Wire management grommet with non-captive closure member
US5429431A (en) * 1992-08-10 1995-07-04 Hon Industries Inc. Wire management system and asssemblies therefor
US5777274A (en) * 1995-03-28 1998-07-07 Sumitomo Wiring Systems, Ltd Grommet having an identifying portion for checking the grommet
US6035730A (en) * 1995-03-28 2000-03-14 Sumitomo Wiring Systems, Ltd. Apparatus for checking grommets
US6000918A (en) * 1997-11-10 1999-12-14 Yu; Jack Electric wire protecting device for ceiling fan having protective grommets and temperature detecting breaker
US6393658B1 (en) * 1999-01-29 2002-05-28 The Marvel Group, Inc. Cable port grommet for modular office furniture
US20060185875A1 (en) * 2003-03-27 2006-08-24 Martin Habel Cable leadthrough device
US7288730B2 (en) * 2003-03-27 2007-10-30 Murrplastik Systemtechnick Gmbh Cable lead-through device
US7427050B2 (en) * 2006-01-10 2008-09-23 Specified Technologies Inc. Apparatus for adjustably retaining and sealing pathway conduits mounted extending through a wall panel
US20070175125A1 (en) * 2006-01-10 2007-08-02 Specified Technologies Inc. Apparatus for adjustably retaining and sealing pathway conduits mounted extending through a wall panel
US20090139743A1 (en) * 2007-12-04 2009-06-04 Bridgeport Fittings, Inc. Wire/cable identification device
US7745740B2 (en) * 2007-12-04 2010-06-29 Bridgeport Fittings, Inc. Wire/cable identification device

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