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Electrical connecting washer

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Publication number
US3588787A
US3588787A US3588787DA US3588787A US 3588787 A US3588787 A US 3588787A US 3588787D A US3588787D A US 3588787DA US 3588787 A US3588787 A US 3588787A
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US
Grant status
Grant
Patent type
Prior art keywords
metal
annulus
electrical
screw
washer
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
Inventor
Colin David Kindell
Terence Robert Raynor
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AMP Inc
Original Assignee
AMP Inc
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Filing date
Publication date
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01RLINE CONNECTORS; CURRENT COLLECTORS
    • H01R4/00Electrically-conductive connections between two or more conductive members in direct contact and means for effecting or maintaining such contact
    • H01R4/24Needle-point, slotted plate, or analogous contact members penetrating insulation or cable strands
    • H01R4/2475Needle-point, slotted plate, or analogous contact members penetrating insulation or cable strands penetrating insulation by means of screw, nut or bolt
    • H01R4/2479Needle-point, slotted plate, or analogous contact members penetrating insulation or cable strands penetrating insulation by means of screw, nut or bolt penetrating area under the head of the screw
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01RLINE CONNECTORS; CURRENT COLLECTORS
    • H01R4/00Electrically-conductive connections between two or more conductive members in direct contact and means for effecting or maintaining such contact
    • H01R4/24Needle-point, slotted plate, or analogous contact members penetrating insulation or cable strands
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S411/00Expanded, threaded, driven, headed, tool-deformed, or locked-threaded fastener
    • Y10S411/90Fastener or fastener element composed of plural different materials
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S411/00Expanded, threaded, driven, headed, tool-deformed, or locked-threaded fastener
    • Y10S411/955Locked bolthead or nut
    • Y10S411/956Automatic base clutch
    • Y10S411/957Biting tooth

Abstract

A CONNECTING WASHER IS PROVIDED WITH PROJECTIONS WHICH SCRAPE THROUGH A SURFACE OF A METAL PART TO MAKE AN ELECTRICAL CONNECTION. PARTS OF A SECOND RESILIENT INSULATING WASHER ARE TRAPPED BETWEEN THE CONNECTING WASHER AND THE METAL PART AND AROUND THE PROJECTIONS TO PROTECT THE CONNECTION AREA OF THE PROJECTIONS AND THE METAL PART FROM CORROSIVE ACTION.

Description

United States Patent inventors Appl. No.

Filed Patented Assignee Priority Colin David Kindell Bushey;

Terence Robert Raynor, Chingford, London, England May 15, 1969 June 28, 1971 AMP Incorporated Harrisburg, Pa.

May 17, 1968, Aug. 16, 1968 Great Britain 23615/68 and 39198/68 ELECTRICAL CONNECTING WASHER 2 Claims, 9 Drawing Figs.

U.S. Cl 339/95, 85/50, 151/35 Int. CL. H01r 3/06 Field of Search 339/94, 95;

151/35, 38; 85/1 (JP),5O

References Cited UNITED STATES PATENTS 1 H1968 Weinstein FOREIGN PATENTS 8/1964 Great Britain 1 1/1966 Great Britain 2/1961 Australia 1. 1/1925 France 9/1951 Germany H Primary Examiner -Stephen J. Novosad Assistant Examiner-Joseph H. McGlynn Attorneys-Curtis, Morris and Safford, William J. Keating,

William Hintze, Frederick W. Rating, John R. Hopkins, Adrian J. LaRue and Jay L. Seitchik ABSTRACT: A connecting washer is provided with projections which scrape through a surface of a metal part to make action.

an electrical connection. Parts of a second resilient insulating washer are trapped between the connecting washer and the metal part and around the projections to protect the connection area of the projections and the metal part from corrosive Patented June 28, 1971 2 Shets-Sheet 1 INVENTOR-S' COLIN DAVID KINDELL TERENCE ROBERT RAYNOR Patented June 28 1971 3,588,787

2 Sheets-Sheet 2 INVENTORS COLIN DAVID KINDELL TERENCE ROBERT RAYNOR lElLlMJ'lllltllQM. CONNECTING WASHER This invention relates to an electrical connecting washer.

In many items ofelcctrical equipment, particularly those incorporating large metal cabinets, e.g. electric washing machines and cookers, ground connections are made to a metal cabinet wall by screwing a self-tapping screw into the wall. The screw is connected to an electrical conductor or an electrical conductor is trapped between the screw head or an associated washer and the metal wall. The screwing action causes the screw head to scrape or scratch an electrically nonconductive coating, tag. a paint or oxide coating on the metal wall, which exposes metal to corrosion. This is especially bad where the electrically nonconductive coating is a paint applied by electrophoretic deposition.

It has been proposed to weld or solder connecting taps to the metal wall before applying the paint coating, the taps being sufficiently long to ensure that electrical connection can be made to the tags without marring the paint finish. This is expensive, and the tags themselves can become corroded.

An electrical connecting washer to be screwed to a metal wall having an electrically nonconductive coating, according to the invention, comprises a metal annulus formed on one side with a projection intermediate the annulus perimeter and the annulus aperture, the projection having a cutting edge to cut through the electrically nonconductive coating to make electrical connection with the metal wall and a sealing annulus formed to resiliently compressible material to lie intermediate the metal annulus and the electrically nonconductive coating with the apertures of the respective annuli aligned to receive a screw to hold the washer to the metal wall.

Advantageously, the metal annulus is formed with a plurality of the projections arranged generally about the screwreceiving aperture. The projections may be discrete or fused to define a continuous cutting edge. Preferably, the sealing annulus is so arranged that resiliently-compressible material is disposed on opposed sides of the cutting edge to prevent corrosive forces reaching the areas where the cutting edge has cut into the metal wall from either side.

The sealing annulus is made of resiliently-compressible material, for example, a nitrile material, so that the screwing of the screw into the metal wall compresses the sealing annulus to form an effective seal against corrosion.

A method of making an electrical connection between an electrically connecting washer according to the invention and a metal wall having an electrically nonconductive coating, comprises so arranging the washer that the cutting edge of the metal annulus protrudes through and beyond the sealing annulus and the respective annuli apertures are aligned to receive a screw, and screwing the washer to the metal wall to cause the cutting edge to cut through the electrically nonconductive coating to make electrical contact with the metal wall and to compress the sealing annulus to seal the area of electrical connection from corrosion.

The invention also includes an assembly made by the method disclosed herein.

An object of the invention is to provide an electrical connecting device having metal-scraping means to scrap paint, oxides, or foreign matter so that an excellent electrical connection can be effected.

Another object is the provision of an electrical connecting device wherein sealing means are provided to prevent corrosion from occurring in the scraped areas.

A further object is to provide an electrical connecting device wherein the metal-scraping means are located in con centric circles.

An additional object is the provision of means for securing the sealing means to the body of the clectricnl connecting device.

Other objects nnd nttninmontn ol' the present invention will become apparent to those skilled in the art upon it reading of the following detailed description when taken in conjunction with the drawings in which there are shown and described illustrative embodiments of the invention; it is to be understood, however, that these embodiments are not intended to be exhaustive nor limiting of the invention but are given for purposes of illustration in order that others skilled in the art may fully understand the invention and the principles thereof and the manner of applying it in practical use so that they may modify it in various forms, each as may be best suited to the conditions of a particular use.

In order that the invention may be well understood, it will now be described by way of example with reference to the accompanying drawings, in which:

FIG. l is a cross-sectional perspective view of one electrical connecting washer according to the invention;

FIG. 2 is an enlarged side cross-sectional view of the washer of FIG. I in assembly with a screw;

FIG. 3 shows an enlarged cross-sectional detail of FIG. 2;

FIG. 4 is an underneath plan view of a metal annulus of another electrical connecting washer according to the invention;

FIG. 5 is a side cross-sectional view taken on lines 1-1 of FIG. 4;

FIG. 6 is a perspective view of a boss on the metal annulus of FIG. 4 drawn to a larger scale;

FIG. 7 is a plan view of a sealing annulus for use with the metal annulus of FIG. 4 but to a reduced scale;

FIG. 8 is a plan view ofa metal annulus of another electrical connecting washer according to the invention; and

FIG. 9 is a section through an assembly comprising the electrical connecting washer according to FIG. 8 and two metal bodies.

The metal annulus ll, FIG. ll, comprises a flat steel stamping having a pair of radially spaced annular grooves 2,3 pressed outwardly of one side. The area of the annulus between the grooves is raised, as at 4, (FIG. 2), by depressing the metal from the other side and this raised area is roughened, as by knurling, ridging or serration, at 5 to define a cutting edge which lies below the plane of the surfaces 6,7 of the annulus lying on the outer opposed sides of the grooves 2,3. The aperture 8 of the annulus receives the shank 9 of a screw, the head 10 of which may rest on the upper side (as seen in FIG. 2), of

the annulus or may be sufficiently large to fit over the annulus I, as shown in broken outline in FIG. 2. Rubber O-rings I1 and 12 are located in the grooves as shown in FIG. 3 by lances l3 struck out of the walls of the grooves at points along their circumference. The diameter of the O-rings is sized so that they project beyond the roughened zone 5 when fitted into the grooves.

When a connection is to be made to a metal cabinet wall having a painted surface, the shank 9 of the screw, which preferably is a sheet-metal screw, is screwed into a hole preformed in the metal wall. lfa wire (not shown) is also to be connected, it is trapped between the screw head and the metal annulus; however, the annulus I may be formed with a ferrule to be crimped onto the end of the wire or a ring-tongue crimped to the wire may be connected to the annulus via the screw. When the screw is nearly home, the O-rings 11 and 12 start to engage with the metal wall and as the screw is further screwed in, the cutting edge 5 meets the painted surface of the metal wall and starts to rotate with the screw to scrape through the paint and form good electrical contact between the washer and the metal wall. The O-rings Ill and 12 are compressed to give a good gasket seal. The O-ring l2 prevents a corrosive atmosphere reaching the cutting edge 5 and the mating metal wall, and the O-ring lll acts as a further seal to prevent the atmosphere reaching the metal bared by the shank 9 of the screw.

The O-ring ll could be omitted, but it exerts a balancing force to the resilient force produced by compression of the O- ring 12. More thun two nnnulnr grooves with corresponding gaskets may he provided. The washer can be reused.

The metal annulus ll of FIGS. 4 to 6 in formed from nickelpluled mild steel by stumping to have six spaced bosses 22 formed on one side and lying on a common pitch circle diameter; but the bosses can be provided at concentric locations on the annulus. The stamping forms a set of depressions 23, corresponding with the bosses 22, in the other side of the annulus 21 (FIG. The bosses 22 are cut with V-notches 24, and the free ends 25 of the notches are sharpened to define a cutting edge. The aperture 26 of the annulus receives a screw shank, and the rim 27 of the washer is bent inwardly in the same direction as bosses 22, FIG. 5, to retain the sealing annulus 29, FIG. 7, formed by molding from nitrile material. The sealing annulus comprises an inner annulus 30 and an outer annulus 31 joined by three radial spokes 32. The two annuli 30 and 31 define openings 33 so dimensioned that when sealing annulus 29 is fitted over metal annulus 21, the bosses 22 can protrude through and above the open annulus. A web 34 is provided by the inner annulus 30 and is perforated by an aperture 35 to receive a screw shank.

In use, the sealing annulus 29 is so fitted over the metal annulus 21 that the apertures 26 and 35 are aligned and the sealing annulus is rotated with respect to the metal annulus 21 to allow the bosses 22 to be passed through openings 33. The electrical connecting washer so formed is then placed against the painted surface ofa metal cabinet wall with the sealing annulus facing the painted surface. A screw is passed through the apertures 26 and 35 and into a hole preformed in the metal wall. As the screw is tightened, the sealing annulus 29 is compressed against the painted surface and the sharp edge 25 of the bosses 22 bite into and through the paint to make electrical contact and force paint and metal from the wall into the grooves 24. The sealing annulus 29 is compressed to form a barrier between a corrosive atmosphere and the areas where bosses 22 have cut into the metal wall and the web 34 stops the atmosphere reaching the areas where the screw shank has cut into the sidewalls of the hole in the metal wall. An electrical connector may be secured to or made part of the screw, e.g. a ring tongue connector connected to a ground projecting electrical connector.

The metal annulus 41, having an aperture 42, FIG. 8, is stamped from nickel-plated mild steel to make four tines 43 which lie on a pitch circle diameter concentric with the aperture 42 and are equally spaced apart. The tines 43 are of triangular form, as shown, and their apices 49 are sharpened to define cutting edges. A sealing annulus 44, (FIG. 9), having a central aperture 45, is made of solid resilient material. in use, the sealing annulus 44 is fitted over the metal annulus 41, with the apertures 42 and 45 in alignment and the tines 43 are forced through the material of the sealing annulus 44. The

electrical connecting washer so formed is then placed against a metal cabinet wall the surface of which may have an electrically nonconductive coating, e.g. a paint or oxide coating, the exposed face of the sealing annulus 44 abutting the metal plate surface 46 (FIG. 9) behind which is a metal body 47. A screw 48 is passed through the apertures 42 and 45, and as the screw is tightened, the apices 49 of the tines 43 bite into the end through the coated metal surface 46 to make electrical contact with the metal despite the presence of the coating. Also as the screw is tightened, the sealing annulus 44 is compressed and seals the areas of contact between the tines and the metal from the atmosphere so minimizing the risk of corrosion. A good electrical connection is thus made between the screw 48 grounding the metal plate 46 and the metal body 47. Annulus 41 may be provided with an integral ferrule for connection with a ground wire. an electrical connector connected to the ground wire may be connected to annulus 41 via the screw 48 or the ground wire may be captured between the screw head and the annulus 4l.

lt will, therefore, be appreciated that the aforementioned and other desirable objects have been achieved; however, it should be emphasized that the particular embodiments of the invention, which are shown and described herein, are intended as merely illustrative and not as restrictive of the invention.

We claim:

1. An electrical connecting washer to be screwed to a metal wall having an electrically nonconductive coating, comprising a metal annulus formedpn one side with a projection intermediate the annulus perimeter and the annu us aperture, the

projection being continuous and extending between a pair of radially-spaced grooves formed in the metal annulus, a cutting edge formed on the continuous projection to cut through the electrically nonconductive coating to make electrical connection with the metal wall, and a sealing annulus comprising a pair of rings of resiliently compressible material disposed one in each groove to lie intermediate the metal annulus and the electrically nonconductive coating with the apertures of the respective annuli aligned to receive a screw to hold the washer to the metal wall.

2. A washer according to claim 1, in which the rings are held in the grooves by lances extending outwardly of the groove walls.

US3588787A 1968-05-17 1969-05-15 Electrical connecting washer Expired - Lifetime US3588787A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB2361568 1968-05-17
GB3919868 1968-08-16

Publications (1)

Publication Number Publication Date
US3588787A true US3588787A (en) 1971-06-28

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ID=26256625

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Application Number Title Priority Date Filing Date
US3588787A Expired - Lifetime US3588787A (en) 1968-05-17 1969-05-15 Electrical connecting washer

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Country Link
US (1) US3588787A (en)
BE (1) BE733192A (en)
DE (1) DE1924896A1 (en)
ES (1) ES367059A1 (en)
FR (1) FR2008794A1 (en)
GB (1) GB1229655A (en)
NL (1) NL6907322A (en)

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3945704A (en) * 1974-03-28 1976-03-23 Kraus Robert A Device for detecting an applied compressive load
US4023882A (en) * 1974-04-25 1977-05-17 Borge Hugo Pettersson Electrical connector device securable to metal member
US4026183A (en) * 1976-05-17 1977-05-31 Illinois Tool Works Inc. Sealing washer
US4174876A (en) * 1977-06-14 1979-11-20 Olympus Optical Co., Ltd. Mounting mechanism for enclosure
US4455804A (en) * 1982-02-19 1984-06-26 Single-Ply Institute Of America, Inc. Membrane anchor
US4693203A (en) * 1985-01-22 1987-09-15 Lewis Marvin C Segmented boat
US4943247A (en) * 1989-05-31 1990-07-24 Amp Incorporated Annular electrical terminal
US4971573A (en) * 1988-09-19 1990-11-20 Raychem Corporation Electrical connection device providing integral strain relief
US5069636A (en) * 1987-07-07 1991-12-03 Raychem Corporation Terminal block and adapter
US5827028A (en) * 1993-11-22 1998-10-27 Swick; E. Grant Electrical connection terminal assembly and tilt washer
US5915903A (en) * 1993-12-10 1999-06-29 Sfs Industrie Holding Ag Large-area washer having friction increasing elements on the underside thereof
US6010802A (en) * 1996-01-22 2000-01-04 Rayovac Corporation Current collector assembly
US6264566B1 (en) 1998-12-31 2001-07-24 Dana Corporation Thrust washer for universal joint
US6497543B1 (en) * 2001-11-20 2002-12-24 Duro Dyne Corporation Aerodynamic resistance weld pin
US6552645B2 (en) * 2001-06-06 2003-04-22 Robert A. Kuczynski Bimetallic actuator for electronic components and other devices
US20040013465A1 (en) * 2002-07-16 2004-01-22 Lapointe Larry P. Oil-less rivet system for a reclining chair mechanism
US20040018062A1 (en) * 2002-06-07 2004-01-29 Frank Calandra Square embossed roof and rib plate
US20070052287A1 (en) * 2005-09-02 2007-03-08 Hendrickson Usa, L.L.C. Axle spindle nut assembly for heavy-duty vehicles
US7581913B2 (en) * 2005-01-25 2009-09-01 Honda Motor Company, Ltd. Seal nut assembly and method of manufacture
USD669442S1 (en) * 2009-05-15 2012-10-23 Bowen Iii Frank Randolph Set of magnets
US20140068930A1 (en) * 2012-09-10 2014-03-13 Renewable Energy Holdings, Llc Air-Tight and Water-Tight Electrical Bonding Device
US8777538B2 (en) 2012-09-10 2014-07-15 Renewable Energy Holdings, Llc Bonding fastener with environmental seals

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4970497U (en) * 1972-09-30 1974-06-19
JPS5085735U (en) * 1973-12-08 1975-07-22
WO2012143034A1 (en) * 2011-04-18 2012-10-26 Fibrecem Holding Ag Roof seal

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3945704A (en) * 1974-03-28 1976-03-23 Kraus Robert A Device for detecting an applied compressive load
US4023882A (en) * 1974-04-25 1977-05-17 Borge Hugo Pettersson Electrical connector device securable to metal member
US4026183A (en) * 1976-05-17 1977-05-31 Illinois Tool Works Inc. Sealing washer
US4174876A (en) * 1977-06-14 1979-11-20 Olympus Optical Co., Ltd. Mounting mechanism for enclosure
US4455804A (en) * 1982-02-19 1984-06-26 Single-Ply Institute Of America, Inc. Membrane anchor
US4693203A (en) * 1985-01-22 1987-09-15 Lewis Marvin C Segmented boat
US5069636A (en) * 1987-07-07 1991-12-03 Raychem Corporation Terminal block and adapter
US4971573A (en) * 1988-09-19 1990-11-20 Raychem Corporation Electrical connection device providing integral strain relief
US4943247A (en) * 1989-05-31 1990-07-24 Amp Incorporated Annular electrical terminal
US5827028A (en) * 1993-11-22 1998-10-27 Swick; E. Grant Electrical connection terminal assembly and tilt washer
US5915903A (en) * 1993-12-10 1999-06-29 Sfs Industrie Holding Ag Large-area washer having friction increasing elements on the underside thereof
US6010802A (en) * 1996-01-22 2000-01-04 Rayovac Corporation Current collector assembly
US6264566B1 (en) 1998-12-31 2001-07-24 Dana Corporation Thrust washer for universal joint
US6552645B2 (en) * 2001-06-06 2003-04-22 Robert A. Kuczynski Bimetallic actuator for electronic components and other devices
US6497543B1 (en) * 2001-11-20 2002-12-24 Duro Dyne Corporation Aerodynamic resistance weld pin
US7284933B2 (en) * 2002-06-07 2007-10-23 Jennmar Corporation Square embossed roof and rib plate
US20040018062A1 (en) * 2002-06-07 2004-01-29 Frank Calandra Square embossed roof and rib plate
US20040208695A1 (en) * 2002-07-16 2004-10-21 Lapointe Larry P. Oil-less rivet system for a reclining chair mechanism
US6939076B2 (en) * 2002-07-16 2005-09-06 La-Z-Boy Incorporated Oil-less rivet system for a reclining chair mechanism
US7101110B2 (en) 2002-07-16 2006-09-05 La-Z-Boy Incorporated Oil-less rivet system for a reclining chair mechanism
US20040013465A1 (en) * 2002-07-16 2004-01-22 Lapointe Larry P. Oil-less rivet system for a reclining chair mechanism
US7581913B2 (en) * 2005-01-25 2009-09-01 Honda Motor Company, Ltd. Seal nut assembly and method of manufacture
US20070052287A1 (en) * 2005-09-02 2007-03-08 Hendrickson Usa, L.L.C. Axle spindle nut assembly for heavy-duty vehicles
USD669442S1 (en) * 2009-05-15 2012-10-23 Bowen Iii Frank Randolph Set of magnets
US20140068930A1 (en) * 2012-09-10 2014-03-13 Renewable Energy Holdings, Llc Air-Tight and Water-Tight Electrical Bonding Device
US8777538B2 (en) 2012-09-10 2014-07-15 Renewable Energy Holdings, Llc Bonding fastener with environmental seals
US8997336B2 (en) * 2012-09-10 2015-04-07 Renewable Energy Holdings, Llc Air-tight and water-tight electrical bonding device
US20150180189A1 (en) * 2012-09-10 2015-06-25 Michael Strizki Air-Tight and Water-Tight Electrical Bonding Device
US20150180188A1 (en) * 2012-09-10 2015-06-25 Michael Strizki Air-Tight and Water-Tight Electrical Bonding Device
US9667012B2 (en) * 2012-09-10 2017-05-30 Michael Strizki Air-tight and water-tight electrical bonding device
US9667013B2 (en) * 2012-09-10 2017-05-30 Michael Strizki Air-tight and water-tight electrical bonding device

Also Published As

Publication number Publication date Type
ES367059A1 (en) 1971-04-01 application
GB1229655A (en) 1971-04-28 application
NL6907322A (en) 1969-11-19 application
BE733192A (en) 1969-11-03 grant
FR2008794A1 (en) 1970-01-23 application
DE1924896A1 (en) 1969-11-27 application

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