US3764730A - Electrical conductor feed through and seal - Google Patents

Electrical conductor feed through and seal Download PDF

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Publication number
US3764730A
US3764730A US00273935A US3764730DA US3764730A US 3764730 A US3764730 A US 3764730A US 00273935 A US00273935 A US 00273935A US 3764730D A US3764730D A US 3764730DA US 3764730 A US3764730 A US 3764730A
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US
United States
Prior art keywords
enclosure
mating surfaces
seal
elastomeric material
portions
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00273935A
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English (en)
Inventor
M Malone
R Dickie
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kearfott Guidance and Navigation Corp
Original Assignee
Singer Co
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Filing date
Publication date
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Publication of US3764730A publication Critical patent/US3764730A/en
Assigned to KEARFOTT GUIDANCE AND NAVIGATION CORPORATION reassignment KEARFOTT GUIDANCE AND NAVIGATION CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: SINGER COMPANY, THE
Assigned to CONTINENTEL ILLINOIS NATIONAL BANK AND TRUST COMPANY OF CHICAGO, 231 SOUTH LASALLE STREET, CHICAGO, IL 60697 reassignment CONTINENTEL ILLINOIS NATIONAL BANK AND TRUST COMPANY OF CHICAGO, 231 SOUTH LASALLE STREET, CHICAGO, IL 60697 SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KEARFOTT GUIDANCE & NAVIGATION CORPORATION
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Expired - Lifetime legal-status Critical Current

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    • 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
    • H01B17/30—Sealing
    • H01B17/303—Sealing of leads to lead-through insulators
    • H01B17/308—Sealing of leads to lead-through insulators by compressing packing material
    • 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
    • H02G3/088—Dustproof, splashproof, drip-proof, waterproof, or flameproof casings or inlets

Definitions

  • ABSTRACT An electrical conductor feed through and seal is provided which allows for the passing of electrical conductors, imbedded in flextape, from outside an enclosure to within an enclosure without the use of headers.
  • Flextapes are used which are configured, in part, to match the profile of the mating surfaces of the enclosure. The tapes are bonded together at this point by a suitable adhesive.
  • An elastomeric material of suitable durometer is inserted between the bonded flextapes and each mating surface, so that when the mating surfaces are drawn together, the required seal is formed.
  • the present invention relates to an electrical conductor feed through and seal which utilizes flextapes and an elastomeric material inserted between the flextapes and the mating surfaces of the barrier to be sealed to effect the feed through and seal.
  • the tapes each have a portion extending without the enclosure and a portion extending within the enclosure.
  • Each tape also has a third portion, configured to the profile of the mating surfaces, which is bonded to the tapes in juxtaposition. thereto.
  • the seal is completed by the insertion of the elastomeric material, of suitable durometer and leakage rate, between the bonded flextapes and the mating surfaces of the barrier to be sealed.
  • FIG. 1 is a cross sectional view of an enclosure using the'feed through seal of this invention.
  • FIG. 2 is a plan view of a portion of the invention.
  • FIG. 3 is the view along line 3-3 of FIG. 2
  • FIG. 4 is an elevational view of a part of the invention.
  • FIG. 5 is a plan view of another embodiment of the invention.
  • FIG. 1 there is shown an enclosure 10, including an end cover 12 and a housing 14 within which could be mounted precision electro-mechanical components and their supporting electronic assemblies.
  • Mating surfaces 16 and 18 are machined to a predetermined roughness which preferably is less than one sixty-fourth micro-inch. This level of roughness will be a function of the desired leakage rate for the seal.
  • Sandwiched between mating surfaces 16 and 18 is a multilayer composite 20, which provides a means of electrical interface between the outside and inside of the enclosure 10.
  • FIG. 2 shows a typical arrangement comprising a portion of composite 20.
  • Each of these sections interfaces with sources of electrical power and electrical signals through the use of connectors 30 and 32 or by any other suitable means recognized in the art.
  • Each of the flextapes 22 and 24 also has a portion thereof extending within the enclosure, such as 34, 36, 38 and 40. These portions feed the various power levels and electrical signals, picked up by connectors 30 and 32 to the various electronic and electromechanical components within the enclosure. One way of effecting this distribution of power and signal is terminating the portions 34, 36, 38 and 40 at a common terminal block 42, from which the power and signals are then routed to the appropriate components within the enclosure.
  • Each of the flextapes 22 and 24 also has a third portion, the contour of which, generally, follows the shape of the mating surfaces 16 and 18.
  • the flextapes are aligned so that the third portion of each is superimposed, one of the other as at 44.
  • FIG. 3 illustrates the composite relationship between the overlapping portion of each flextape.
  • Flextape portion 46 is bondec to flextape 48 through the use of polytetrafluoroethylene 50, commercially available as TEFLON, a registered trademark of the Dupont Company.
  • TEFLON polytetrafluoroethylene 50
  • a suitable amount of TEFLON is used to insure that the voids between the portions 46 and 48, caused by surface irregularities in each opposing face, are filled thereby eliminating sneak paths which could detract from the effectiveness of the seal.
  • the outer surfaces 52 and 54 of each tape have bonded to them sheets of polyimide, commercially available as KAPTON or sheets of polyester commercially available as MYLAR, both registered trademarks of the Dupont Company.
  • the bonding material 56 and 57 is TEFLON and the amount used thereof is that necessary to eliminate possible sneak paths.
  • the bonding of the flextape layers and KAP- TON sheet extends to point 58 on the outer perimeter and to point 59 on the inner perimeter. This reserves the flexibility of the first and second portions of th flextapes 22 and 24.
  • composite layer includes two gaskets of elastomeric material 60 and 62 which are sandwiched between the flextape layer and mating surfaces 16 and 18.
  • gaskets preferably, may be made of Butyl rubber, and may have a durometer preferably between 20 and 75, as measured on a Shore A scale, well known in the art. Typically, their thickness may be on the order of 0.020 inch to 0.030 inch.
  • the type of material selected, Butyl being a preferred selection depends on the leakage rate to be achieved by the seal under the environmental conditions to which it is exposed. Butyl rubber, for example, has a leakage rate of 1 cc/in/year.
  • Other suitable materials would include Nitrile or Viton rubber.
  • gaskets 60 and 62 may be cemented to the flextape layer through the use of an appropriate adhesive although this is not absolutely necessary to achieve typical leak rates.
  • FIG. 4 shows a typical configuration for gaskets 60 and 62.
  • the contour of each gasket follows generally the contour of the third portion of the flextape layer, which in turn, is configured to reflect the, contour of mating surfaces 16 and 18.
  • Each gasket has the requisite number of thru holes 64, which align with their counterparts in the flextape laye and each of the mating surfaces.
  • Screws 66 secure end cover 12 to housing 14 with the composite layer 20 sandwiched therebetween. The screws are tightened to a predetermined torque level, thereby compressing composite layer 20.
  • the torque level is such as to provide a sufficient amount of compression to result in a prescribed leakage rate.
  • the cover 12 and housing 14 are each provided with a protrusion 67 and 69 respectively.
  • These protrusions generally extend to one-half to three-fouths the thickness of the gasket material. Without this restraint sneak paths could develop, in particular, in the vicinity of the thru holes 64.
  • similar protrusions could be provided on the inside rim of the cover and housing to thereby prevent cold flow at the inner diameter of the composite.
  • An alternate method for minimizing cold flow could be to reinforce the gasket material by imbeding therein fibrous material such as asbestos.
  • fibrous material such as asbestos.
  • This technique is not suitable, however, when the gas e.g. Helium, filling the enclosure 10 has a molecular size smaller than that of the fibrous material used. When this is the case, increased leakage occurs due to the sneak paths through the fibrous material.
  • flextape composite need not be limited to only two flextapes. It could be only one tape or it could be more than two.
  • FIG. 5 depicts an alternate construction of the invention which can be used when the portion of the flextape within the enclosure is longer in length than the inner diameter (in the case of a circular third portion) of the previously identified third portion of the tape.
  • Flextape portion 68 terminated in connector 70, serves the same function as tape 26 or 28 and connector 30 or 32 described above.
  • Interior tape portion 72 is longer in length, 74, then the inside diameter 76 of the third portion 78, of the flextape. Because of the extra length,
  • This section is shown at 80. It essentially is a piece of flextape (the number of such pieces equal to the number of flextapes whose interior portion length is longer than diameter 76) which is bonded together, with the remaining portion 78, in a manner identical to that described above. Gaskets of elastomeric material would then be added to either side of the composite as hereinabove described.
  • a device for providing an electrical conductor feed through and seal between the mating surfaces of an enclosure which comprises:
  • said aligned third portions configured such that they are continuously interposed between the mating surfaces of said enclosure
  • each of said mating surfaces has a protrusion extending from the outer perimeter thereof tothereby restrain the outward extrusion of said elastomeric material when said mating surfaces are drawn together.
  • the device of claim 1 which includes a layer of polyimide bonded to the outboard side of each of the outermost third portions.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Casings For Electric Apparatus (AREA)
  • Gasket Seals (AREA)
  • Connector Housings Or Holding Contact Members (AREA)
  • Cable Accessories (AREA)
US00273935A 1972-07-21 1972-07-21 Electrical conductor feed through and seal Expired - Lifetime US3764730A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US27393572A 1972-07-21 1972-07-21

Publications (1)

Publication Number Publication Date
US3764730A true US3764730A (en) 1973-10-09

Family

ID=23046049

Family Applications (1)

Application Number Title Priority Date Filing Date
US00273935A Expired - Lifetime US3764730A (en) 1972-07-21 1972-07-21 Electrical conductor feed through and seal

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US (1) US3764730A (enrdf_load_html_response)
JP (1) JPS5751757B2 (enrdf_load_html_response)
CA (1) CA975065A (enrdf_load_html_response)
DE (1) DE2337080C2 (enrdf_load_html_response)
FR (1) FR2194025B1 (enrdf_load_html_response)
GB (1) GB1410877A (enrdf_load_html_response)
SE (1) SE394347B (enrdf_load_html_response)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4029893A (en) * 1973-12-28 1977-06-14 Societe Anonyme De Telecommunications Double-wall cryostat having electrical connections
EP0096914A1 (en) * 1982-06-04 1983-12-28 Koninklijke Philips Electronics N.V. Device comprising a multiple electrical feedthrough
US4636581A (en) * 1985-06-24 1987-01-13 Motorola, Inc. Sealed flexible printed wiring feedthrough apparatus
US4804330A (en) * 1987-05-14 1989-02-14 The United States Of America As Represented By The Secretary Of The Air Force Hermetic, vacuum and pressure tight electrical feedthru
US4914433A (en) * 1988-04-19 1990-04-03 Hughes Tool Company Conductor system for well bore data transmission

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB201859A (en) * 1923-02-07 1923-08-09 Albert Cecil Greene Means or couplings for connecting aerials to radio apparatus or for connecting together other electrical conductors
FR697168A (fr) * 1929-07-05 1931-01-13 Siemens Ag Traversée pour conducteurs électriques dans les appareils à vide
DE1127422B (de) * 1960-03-08 1962-04-12 Siemens Ag Gasdichte elektrische Mehrfachdurchfuehrung durch die Wand eines Hochdruckbehaelters
US3214713A (en) * 1961-06-30 1965-10-26 Sanders Associates Inc Flexible printed circuit cable connector

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3422213A (en) * 1966-04-21 1969-01-14 Webb James E Connector strips

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB201859A (en) * 1923-02-07 1923-08-09 Albert Cecil Greene Means or couplings for connecting aerials to radio apparatus or for connecting together other electrical conductors
FR697168A (fr) * 1929-07-05 1931-01-13 Siemens Ag Traversée pour conducteurs électriques dans les appareils à vide
DE1127422B (de) * 1960-03-08 1962-04-12 Siemens Ag Gasdichte elektrische Mehrfachdurchfuehrung durch die Wand eines Hochdruckbehaelters
US3214713A (en) * 1961-06-30 1965-10-26 Sanders Associates Inc Flexible printed circuit cable connector

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4029893A (en) * 1973-12-28 1977-06-14 Societe Anonyme De Telecommunications Double-wall cryostat having electrical connections
EP0096914A1 (en) * 1982-06-04 1983-12-28 Koninklijke Philips Electronics N.V. Device comprising a multiple electrical feedthrough
US4549108A (en) * 1982-06-04 1985-10-22 U.S. Philips Corporation Multichannel X-ray detector with multiple electrical feedthrough members
US4636581A (en) * 1985-06-24 1987-01-13 Motorola, Inc. Sealed flexible printed wiring feedthrough apparatus
US4804330A (en) * 1987-05-14 1989-02-14 The United States Of America As Represented By The Secretary Of The Air Force Hermetic, vacuum and pressure tight electrical feedthru
US4914433A (en) * 1988-04-19 1990-04-03 Hughes Tool Company Conductor system for well bore data transmission

Also Published As

Publication number Publication date
SE394347B (sv) 1977-06-20
GB1410877A (en) 1975-10-22
FR2194025A1 (enrdf_load_html_response) 1974-02-22
CA975065A (en) 1975-09-23
DE2337080A1 (de) 1974-02-07
FR2194025B1 (enrdf_load_html_response) 1978-06-30
DE2337080C2 (de) 1983-05-05
JPS4951557A (enrdf_load_html_response) 1974-05-18
JPS5751757B2 (enrdf_load_html_response) 1982-11-04

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AS Assignment

Owner name: KEARFOTT GUIDANCE AND NAVIGATION CORPORATION, NEW

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SINGER COMPANY, THE;REEL/FRAME:005029/0310

Effective date: 19880425

AS Assignment

Owner name: CONTINENTEL ILLINOIS NATIONAL BANK AND TRUST COMPA

Free format text: SECURITY INTEREST;ASSIGNOR:KEARFOTT GUIDANCE & NAVIGATION CORPORATION;REEL/FRAME:005250/0330