US3569915A - Grounding foil - Google Patents

Grounding foil Download PDF

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Publication number
US3569915A
US3569915A US759910A US3569915DA US3569915A US 3569915 A US3569915 A US 3569915A US 759910 A US759910 A US 759910A US 3569915D A US3569915D A US 3569915DA US 3569915 A US3569915 A US 3569915A
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United States
Prior art keywords
foil
conductor
tangs
grounding
cavity
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Expired - Lifetime
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US759910A
Inventor
Stanley J Sorensen
Arvin L Langham
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TDK Micronas GmbH
ITT Inc
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Deutsche ITT Industries GmbH
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Publication of US3569915A publication Critical patent/US3569915A/en
Assigned to ITT CORPORATION reassignment ITT CORPORATION CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: INTERNATIONAL TELEPHONE AND TELEGRAPH CORPORATION
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01RELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/66Structural association with built-in electrical component
    • H01R13/719Structural association with built-in electrical component specially adapted for high frequency, e.g. with filters
    • H01R13/7197Structural association with built-in electrical component specially adapted for high frequency, e.g. with filters with filters integral with or fitted onto contacts, e.g. tubular filters
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01RELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/648Protective earth or shield arrangements on coupling devices, e.g. anti-static shielding  
    • H01R13/652Protective earth or shield arrangements on coupling devices, e.g. anti-static shielding   with earth pin, blade or socket

Definitions

  • the invention comprises a grounding foil member having one or more cavities therein, formed of tangs for securing circuit elements such as filters thereto by means of direct contact.
  • the outer edge of the foil member which contacts the inner shell of a conductor is formed of flaps bent at an angle. Each of the flaps deflect upon entering the shell which completes the electrical circuit between the filter and the shell through the ground foil.
  • the filter may be removed from the ground foil and the ground foil from the shell with relative ease and with no soldering required.
  • the invention relates in general to grounding foils and more particularly to a device for mounting an element in a conductor having a ground connection therebetween.
  • the grounding foil of the present invention eliminates the need for soldering the filter to the ground plane.
  • the filter may be installed and removed with relative ease due to the physical contraction of the grounding foil. Further, good contact is maintained at all times on the outside diameter of the filter and the inside diameter of the outercoaxial conductor. Since the filter ground foil is not soldered to the shell, a connector assembly using the grounding foil, can be reworked with ease. Thus, potting is not required in the connector and other physical means can be employed to retain the insulators and other components in the shell.
  • the grounding foil can be metal stamped or metal formed from an electroetching, thus its cost is relatively competitive in comparison to a conventional ground plane which is made by jig boring or die cast tooling.
  • the invention comprises a ground foil member made of lightweight material such as a single piece of the beryllium copper which may be plated with silver to reduce the contact resistance between contact points.
  • a ground foil member made of lightweight material such as a single piece of the beryllium copper which may be plated with silver to reduce the contact resistance between contact points.
  • the foil member Within the foil member are one or more cavities wherein electrical elements are retained and grounded by the foil.
  • Each of the cavities are formed from a plurality of short tangs which are bent to form a funnel. The tangs taper inward to block or close the inside diameter of each cavity.
  • Each tang operates independent of the other tangs and when the electrical element is inserted, they deflect over the outside diameter of the electrical element.
  • the outer edge of the foil member has means for securing the ground foil to a conductor providing a ground connection between the electrical elements and the conductor.
  • FIG. 1 depicts a perspective view partly in section of a preferred embodiment of the invention
  • FIG. 2 is a side view, partly in section, of the device of FIG. 1, disassembled.
  • FIG. I a filter ground foil 12 mounted in a shell 14, which may be the outer conductor of a coaxial line, the shell having a mounting flange 16 which may be secured to a rigid structure by means of a nut (not shown) passing through the hole 18 in the flange.
  • the filter ground foil is generally circular in shape and has a diameter slightly less than the inner diameter of the shell 14 at the point where the foil is to be mounted. Secured along the outer periphery of the foil are a plurality of flaps 22 bent at an angle of 30 prior to insertion into the shell. Each of the flaps deflect upon entering the connector shell and keep a constant pressure and contact with the inside of the shell.
  • a plurality of individual cavities 24 are formed on the grounding foil.
  • Each of the cavities contain a plurality of short tangs 26 (three are shown for illustration purposes in the drawings) which are bent initially at an angle of 15 to form a funnel.
  • Each tang operates independently of the others and when an element such as a filter 28 is inserted in the funnel formed by the tangs 26, the tangs deflect over the outside diameter of the filter.
  • Each tang is limited in the amount of deflection due to the fiber stresses generated when the tang deflects; however, this deflection can be increased depending upon the size of the filter and the deflection required to rriaintain contact with the filter.
  • each tang acts like a spring, applying constant pressure to the outside diameter of the filter. When the filter is removed, the tangs return to their normal position, ready to accept another filter of a different outside diameter tolerance.
  • the filter 28 used in combination with the ground foil is of conventional design having a pin 32 at one end and a pin contact 34 at the other end.
  • the filter shown in the drawing is for illustrative purposes only, it being understood that other arrangements or circuit elements could be used in place of the depicted filter 28.
  • FIG. 2 there is depicted, the arrangement of FIG. 1 prior to assembly.
  • the tangs 26 are in their normal positions at an angle of 15 with respect to the main ground foil body prior to insertion of the filter 28.
  • the flaps 22 are at a 30 angle prior to insertion of the grounding foil into the shell 14. It should be understood, of course, that the angles mentioned are merely a matter of design and not limiting, the exact choice of angles being dependent upon the exact usage of the grounding foil.
  • the entire assembly and disassembly does not require soldering or other mechanical methods to maintain good electrical contact between the shell and the filter through the grounding foil; and the filters can be replaced, added, or removed from the connector without difficulty and at relatively minor costs.
  • the grounding foil can be used in any filter connector that employs a circular filter. Of course, with minor modifications, other shaped filters could be used. Moreover, with slight modification of the grounding foil, other shaped connectors such as elliptical, rectangular, or square shapes could be used.
  • grounding foil has been described as being made of beryllium copper which has been plated with silver, it should be understood that the grounding foil also could be made out of any conductive material which can act like a spring, such as brass or stainless-spring steel. Also, insulating plugs may be utilized within the member 14 to support the member 28 or as a stop for the member 12.
  • grounding foil retaining removable electrical elements within a conductor and providing a ground connection between said elements and said conductor; said grounding foil being of resilient sheet metal and comprising:
  • foil member whose outer dimensions are slightly smaller than the confines of said conductor, said foil member having a plurality of tabs extending therefrom resiliently engaging the inner surface of said conductor;
  • said tangs being angularly disposed with respect to a plane defining the surface of said foil adjacent said tangs prior to insertion of said elements in said cavity.
  • each of said cavity tangs acts independently of the other tangs of a cavity applying constant pressure to the outer surface of an electrical element; and upon removal of said electrical element from said cavity, said tangs being capable of returning to their normal position.
  • grounding foil in accordance with claim 1 wherein said grounding foil is a thin flat member and is mounted in said conductor in a plane perpendicular to an axis defined by said conductor.
  • grounding foil in accordance with claim 4 wherein said grounding foil is made of beryllium copper plated with silver.

Abstract

The invention comprises a grounding foil member having one or more cavities therein, formed of tangs for securing circuit elements such as filters thereto by means of direct contact. The outer edge of the foil member which contacts the inner shell of a conductor is formed of flaps bent at an angle. Each of the flaps deflect upon entering the shell which completes the electrical circuit between the filter and the shell through the ground foil. The filter may be removed from the ground foil and the ground foil from the shell with relative ease and with no soldering required.

Description

United States Patent Inventors Stanley J. Sorensen Primary Examiner-Richard E. Moore AttorneysC. Cornell Remsen, Jr., Walter J. Baum, Paul W. Hemminger, Percy P. Lantzy and Thomas E. Kristofferson ABSTRACT: The invention comprises a grounding foil member having one or more cavities therein, formed of tangs for securing circuit elements such as filters thereto by means of direct contact. The outer edge of the foil member which contacts the inner shell of a conductor is formed of flaps bent at an angle. Each of the flaps deflect upon entering the shell which completes the electrical circuit between the filter and the shell through the ground foil. The filter may be removed from the ground foil and the ground foil from the shell with relative ease and with no soldering required.
Patented March 9, 1971 3,569,915
I Fm?! y INVENTORS. 5774/1/46 V J SOEfl/SEA/ ,ggW/V 4. AAA/GHAM cnouunnvc FOIL GROUNDING FOIL The invention relates in general to grounding foils and more particularly to a device for mounting an element in a conductor having a ground connection therebetween.
BACKGROUND OF THE INVENTION filter cavity and then potting used to hold the filters in the connector. Still another approach is to solder the filter to the contact and insert the filter into the ground plane and finally soldering this filter-contact assembly to the ground plane.
Drawbacks tov the above mentioned techniques are numerous. For example when a filter is soldered to the ground plane, the connector assembly and filters become extremely difficult to rework or change. In effect, once the filter is soldered to the ground plane, the connector becomes a nonrepairable assembly. Further, the quality of the ground connection between 'the filter and the ground plane is not known until the assembly of the connector is completed and tested. Thus, when the ground connection is poor, the connector assembly must undergo extensive reworking in order to obtain a good ground contact. Moreover, component and assembly costs are high due to the physical soldering of the filters and jig boring or die casting is required to manufacture the ground plane.
In order to overcome the attendant disadvantages of prior art filter connections, the grounding foil of the present invention eliminates the need for soldering the filter to the ground plane. The filter may be installed and removed with relative ease due to the physical contraction of the grounding foil. Further, good contact is maintained at all times on the outside diameter of the filter and the inside diameter of the outercoaxial conductor. Since the filter ground foil is not soldered to the shell, a connector assembly using the grounding foil, can be reworked with ease. Thus, potting is not required in the connector and other physical means can be employed to retain the insulators and other components in the shell. Moreover, the grounding foil can be metal stamped or metal formed from an electroetching, thus its cost is relatively competitive in comparison to a conventional ground plane which is made by jig boring or die cast tooling.
SUMMARY OF THE INVENTION More particularly, the invention comprises a ground foil member made of lightweight material such as a single piece of the beryllium copper which may be plated with silver to reduce the contact resistance between contact points. Within the foil member are one or more cavities wherein electrical elements are retained and grounded by the foil. Each of the cavities are formed from a plurality of short tangs which are bent to form a funnel. The tangs taper inward to block or close the inside diameter of each cavity. Each tang operates independent of the other tangs and when the electrical element is inserted, they deflect over the outside diameter of the electrical element. The outer edge of the foil member has means for securing the ground foil to a conductor providing a ground connection between the electrical elements and the conductor.
The advantage of the invention, both as to its construction and mode of operation, will be readily appreciated as the same becomes better understood by reference to the following detailed description when'considered in connection with the accompanying drawings in which like referenced numerals designate like parts throughout the FIGS.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 depicts a perspective view partly in section of a preferred embodiment of the invention; and 1 FIG. 2 is a side view, partly in section, of the device of FIG. 1, disassembled.
DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to the drawings, there is shown in FIG. I a filter ground foil 12 mounted in a shell 14, which may be the outer conductor of a coaxial line, the shell having a mounting flange 16 which may be secured to a rigid structure by means of a nut (not shown) passing through the hole 18 in the flange.
The filter ground foil is generally circular in shape and has a diameter slightly less than the inner diameter of the shell 14 at the point where the foil is to be mounted. Secured along the outer periphery of the foil are a plurality of flaps 22 bent at an angle of 30 prior to insertion into the shell. Each of the flaps deflect upon entering the connector shell and keep a constant pressure and contact with the inside of the shell.
A plurality of individual cavities 24 are formed on the grounding foil. Each of the cavities contain a plurality of short tangs 26 (three are shown for illustration purposes in the drawings) which are bent initially at an angle of 15 to form a funnel. Each tang operates independently of the others and when an element such as a filter 28 is inserted in the funnel formed by the tangs 26, the tangs deflect over the outside diameter of the filter. Each tang is limited in the amount of deflection due to the fiber stresses generated when the tang deflects; however, this deflection can be increased depending upon the size of the filter and the deflection required to rriaintain contact with the filter. Thus, each tang acts like a spring, applying constant pressure to the outside diameter of the filter. When the filter is removed, the tangs return to their normal position, ready to accept another filter of a different outside diameter tolerance.
The filter 28 used in combination with the ground foil is of conventional design having a pin 32 at one end and a pin contact 34 at the other end. However, the filter shown in the drawing is for illustrative purposes only, it being understood that other arrangements or circuit elements could be used in place of the depicted filter 28.
Referring now to FIG. 2, there is depicted, the arrangement of FIG. 1 prior to assembly. As can readily be seen, the tangs 26 are in their normal positions at an angle of 15 with respect to the main ground foil body prior to insertion of the filter 28. Further, the flaps 22 are at a 30 angle prior to insertion of the grounding foil into the shell 14. It should be understood, of course, that the angles mentioned are merely a matter of design and not limiting, the exact choice of angles being dependent upon the exact usage of the grounding foil.
As can readily be seen, the entire assembly and disassembly does not require soldering or other mechanical methods to maintain good electrical contact between the shell and the filter through the grounding foil; and the filters can be replaced, added, or removed from the connector without difficulty and at relatively minor costs.
The grounding foil can be used in any filter connector that employs a circular filter. Of course, with minor modifications, other shaped filters could be used. Moreover, with slight modification of the grounding foil, other shaped connectors such as elliptical, rectangular, or square shapes could be used.
Further, while the grounding foil has been described as being made of beryllium copper which has been plated with silver, it should be understood that the grounding foil also could be made out of any conductive material which can act like a spring, such as brass or stainless-spring steel. Also, insulating plugs may be utilized within the member 14 to support the member 28 or as a stop for the member 12.
It should be further understood that the foregoing disclosure relates only to the preferred embodiments of the invention and that it is intended to cover all changes and modifications of the examples of the invention herein chosen for the purpose of the disclosure which do not constitute departures from the spirit and scope of the invention.
We claim:
1. In combination a grounding foil retaining removable electrical elements within a conductor and providing a ground connection between said elements and said conductor; said grounding foil being of resilient sheet metal and comprising:
a foil member whose outer dimensions are slightly smaller than the confines of said conductor, said foil member having a plurality of tabs extending therefrom resiliently engaging the inner surface of said conductor;
means on said foil surface defining a plurality of cavities each formed from a plurality of short tangs, said tangs deflecting over said electrical element with said electrical element inserted in said cavity; and
said tangs being angularly disposed with respect to a plane defining the surface of said foil adjacent said tangs prior to insertion of said elements in said cavity.
2. A grounding foil in accordance with claim 1 wherein the outer edge defined by said tabs is slightly greater than said inner dimension of said conductor, said tabs deflecting upon insertion of said foil into said conductor, thereby providing a constant pressure and contact between said foil and said conductor.
3. A grounding foil in accordance with claim 1 wherein each of said cavity tangs acts independently of the other tangs of a cavity applying constant pressure to the outer surface of an electrical element; and upon removal of said electrical element from said cavity, said tangs being capable of returning to their normal position.
4. A grounding foil in accordance with claim 1 wherein said grounding foil is a thin flat member and is mounted in said conductor in a plane perpendicular to an axis defined by said conductor.
5. A grounding foil in accordance with claim 4 wherein said grounding foil is made of beryllium copper plated with silver.

Claims (5)

1. In combination a grounding foil retaining removable electrical elements within a conductor and providing a ground connection between said elements and said conductor; said grounding foil being of resilient sheet metal and comprising: a foil member whose outer dimensions are slightly smaller than the confines of said conductor, said foil member having a plurality of tabs extending therefrom resiliently engaging the inner surface of said conductor; means on said foil surface defining a plurality of cavities each formed from a plurality of short tangs, said tangs deflecting over said electrical element with said electrical element inserted in said cavity; and said tangs being angularly disposed with respect to a plane defining the surface of said foil adjacent said tangs prior to insertion of said elements in said cavity.
2. A grounding foil in accordance with claim 1 wherein the outer edge defined by said tabs is slightly greater than said inner dimension of said conductor, said tabs deflecting upon insertion of said foil into said conductor, thereby providing a constant pressure and contact between said foil and said conductor.
3. A grounding foil in accordance with claim 1 wherein each of said cavity tangs acts independently of the other tangs of a cavity applying constant pressure to the outer surface of an electrical element; and upon removal of said electrical element from said cavity, said tangs being capable of returning to their normal position.
4. A grounding foil in accordance with claim 1 wherein said grounding foil is a thin flat member and is mounted in said conductor in a plane perpendicular to an axis defined by said conductor.
5. A grounding foil in accordance with claim 4 wherein said grounding foil is made of beryllium copper plated with silver.
US759910A 1968-09-16 1968-09-16 Grounding foil Expired - Lifetime US3569915A (en)

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US3790858A (en) * 1973-01-29 1974-02-05 Itt Electrical connector with component grounding plate
US3825874A (en) * 1973-07-05 1974-07-23 Itt Electrical connector
DE2707160A1 (en) * 1976-02-23 1977-09-01 Bendix Corp CONNECTOR
US4059326A (en) * 1974-04-08 1977-11-22 General Electric Company Dry-type instrument transformer with potential tap and connector therefor
US4106839A (en) * 1976-07-26 1978-08-15 Automation Industries, Inc. Electrical connector and frequency shielding means therefor and method of making same
US4275945A (en) * 1979-08-31 1981-06-30 The Bendix Corporation Filter connector with compound filter elements
US4440463A (en) * 1981-10-26 1984-04-03 The Bendix Corporation Electrical connector having a metallized plastic grounding insert
US4453798A (en) * 1982-06-18 1984-06-12 Amp Incorporated Shielded cable on coaxial connector
DE3410331A1 (en) * 1983-03-29 1984-10-04 Deutsche Itt Industries Gmbh, 7800 Freiburg ELECTRICAL CONNECTOR
US4506937A (en) * 1983-05-02 1985-03-26 Amp Incorporated Latching-grounding blocks
US4512618A (en) * 1983-03-10 1985-04-23 Amp Incorporated Grounding mating hardware
US4648681A (en) * 1984-12-20 1987-03-10 Amp Incorporated Filtered electrical plug
US4674807A (en) * 1986-03-03 1987-06-23 Harvey Hubbell Incorporated Shielded connector
USRE32502E (en) * 1983-03-10 1987-09-15 Amp Incorporated Grounding mating hardware
US4695105A (en) * 1984-12-20 1987-09-22 Amp Incorporated Filtered electrical receptacle
US4792310A (en) * 1984-04-11 1988-12-20 Murata Manufacturing Co., Ltd. Connector having filtering function
US4940429A (en) * 1988-04-26 1990-07-10 Oxley Developments Company Limited Removable filter array for multi-way connectors
US5181859A (en) * 1991-04-29 1993-01-26 Trw Inc. Electrical connector circuit wafer
US5246389A (en) * 1993-02-23 1993-09-21 Amphenol Corporation High density, filtered electrical connector
US5248266A (en) * 1992-09-15 1993-09-28 Itt Coporation Connector with sealed component contact
US5257949A (en) * 1991-10-17 1993-11-02 Itt Corporation Connector with interchangeable contacts
US5287076A (en) * 1991-05-29 1994-02-15 Amphenol Corporation Discoidal array for filter connectors
EP0601327A2 (en) * 1992-11-09 1994-06-15 Framatome Connectors International High density filtered connector
US5346403A (en) * 1993-07-22 1994-09-13 Itt Corporation Connector grounding arrangement
US5387131A (en) * 1991-04-29 1995-02-07 Trw Inc. Network conditioning insert
US5414587A (en) * 1991-04-29 1995-05-09 Trw Inc. Surge suppression device
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US5428288A (en) * 1991-04-29 1995-06-27 Trw Inc. Microelectric monitoring device
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US5509821A (en) * 1994-11-14 1996-04-23 Itt Corporation D-sub connector
US5590058A (en) * 1991-04-29 1996-12-31 Trw Inc. Battery monitor for unobstrusive installation with a battery connector
US5686697A (en) * 1995-01-06 1997-11-11 Metatech Corporation Electrical circuit suspension system
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US20030152331A1 (en) * 2001-02-12 2003-08-14 Edwin Dair Methods and apparatus for fiber-optic modules with shielded housing/covers having mixed finger types
US6659655B2 (en) 2001-02-12 2003-12-09 E20 Communications, Inc. Fiber-optic modules with housing/shielding
US20040116003A1 (en) * 2001-12-12 2004-06-17 Jochen Wessner Electrical contact element
US7278887B1 (en) 2006-05-30 2007-10-09 John Mezzalingua Associates, Inc. Integrated filter connector
US20080261458A1 (en) * 2005-03-24 2008-10-23 Markus Eckel Housing and Electrical Plug for Transmitting Electrical Drive Power
US20140261640A1 (en) * 2013-03-14 2014-09-18 A.K. Stamping Company, Inc. Grounding Spacer
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Cited By (61)

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Publication number Priority date Publication date Assignee Title
FR2215716A1 (en) * 1973-01-29 1974-08-23 Itt
US3790858A (en) * 1973-01-29 1974-02-05 Itt Electrical connector with component grounding plate
US3825874A (en) * 1973-07-05 1974-07-23 Itt Electrical connector
US4059326A (en) * 1974-04-08 1977-11-22 General Electric Company Dry-type instrument transformer with potential tap and connector therefor
DE2707160A1 (en) * 1976-02-23 1977-09-01 Bendix Corp CONNECTOR
US4106839A (en) * 1976-07-26 1978-08-15 Automation Industries, Inc. Electrical connector and frequency shielding means therefor and method of making same
US4123842A (en) * 1976-07-26 1978-11-07 Automation Industries, Inc. Method of making frequency shielding means for an electrical connector
US4275945A (en) * 1979-08-31 1981-06-30 The Bendix Corporation Filter connector with compound filter elements
US4440463A (en) * 1981-10-26 1984-04-03 The Bendix Corporation Electrical connector having a metallized plastic grounding insert
US4453798A (en) * 1982-06-18 1984-06-12 Amp Incorporated Shielded cable on coaxial connector
US4512618A (en) * 1983-03-10 1985-04-23 Amp Incorporated Grounding mating hardware
USRE32502E (en) * 1983-03-10 1987-09-15 Amp Incorporated Grounding mating hardware
DE3410331A1 (en) * 1983-03-29 1984-10-04 Deutsche Itt Industries Gmbh, 7800 Freiburg ELECTRICAL CONNECTOR
US4600262A (en) * 1983-03-29 1986-07-15 International Telephone & Telegraph Corp. Electrical connector embodying electrical circuit components
US4506937A (en) * 1983-05-02 1985-03-26 Amp Incorporated Latching-grounding blocks
US4792310A (en) * 1984-04-11 1988-12-20 Murata Manufacturing Co., Ltd. Connector having filtering function
US4648681A (en) * 1984-12-20 1987-03-10 Amp Incorporated Filtered electrical plug
US4695105A (en) * 1984-12-20 1987-09-22 Amp Incorporated Filtered electrical receptacle
US4674807A (en) * 1986-03-03 1987-06-23 Harvey Hubbell Incorporated Shielded connector
US4940429A (en) * 1988-04-26 1990-07-10 Oxley Developments Company Limited Removable filter array for multi-way connectors
US5428288A (en) * 1991-04-29 1995-06-27 Trw Inc. Microelectric monitoring device
US5414587A (en) * 1991-04-29 1995-05-09 Trw Inc. Surge suppression device
US5568348A (en) * 1991-04-29 1996-10-22 Trw Inc. Insert device for electrical relays, solenoids, motors, controllers, and the like
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GB1234355A (en) 1971-06-03
DE1946115A1 (en) 1970-03-19

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