# US 4,681,497 A · Encapsulated fastener

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- Number: US 4,681,497 A
- Document ID: US4681497A
- Status: Granted
- Kind: A
- Application number: 06/739,027
- Filed: 1985-05-29
- Granted: 1987-07-21
- Earliest claimed: 1985-05-29
- Assignees: Microdot Inc.
- Inventors: Imre Berecz
- Web page: https://patentgrep.com/patent/US4681497A

## CPC

- H05F 3/02: by means of earthing connections
- B29C 70/86: Incorporated in coherent impregnated reinforcing layers, {e.g. by winding}
- B29C 70/882: {partly or totally electrically conductive, e.g. for EMI shielding (conductive floors or floor coverings H05F3/025; EMI shielding in general H05K9/00)}
- B29C 70/885: {with incorporated metallic wires, nets, films or plates (as lost heating elements B29C35/0272, B29C61/0625)}
- B29D 1/00: Producing articles with screw-threads
- B64D 45/02: Lightning protectors; Static dischargers
- F16B 33/004: {Sealing; Insulation (by means of washers F16B43/001)}
- F16B 37/14: Cap nuts; Nut caps or bolt caps
- B29K 2995/0005: Conductive
- Y02T 50/40: Weight reduction
- Y10S 411/903: Resinous exterior
- Y10S 411/908: Resinous material
- H05F: STATIC ELECTRICITY; NATURALLY-OCCURRING ELECTRICITY
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- B29D: PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE (making granules B29B9/00; making preforms B29B11/00)
- B64D: EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- F16B: DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING (couplings for transmitting rotation F16D)
- B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

An encapsulated metal bolt comprises a head portion having an encapsulating cap thereon with a plurality of conductive fibers therein electrically isolated from the head but electrically exposed to the surface of a complementary aperture.

## Claims

### Claim 1

An encapsulated fastener for introduction through an aperture in a workpiece having conductive fibers therein, said fastener comprising a metal bolt having a head portion at one end, a threaded portion at the other end, and a shank between said head and end portions, and a plastic cap encapsulating the head portion of said bolt having a plurality of resin encapsulated electrically conductive fibers therein, said electrically conductive fibers being substantially electrically isolated from said metal bolt by the plastic resin of said cap, the radially outer periphery of said plastic cap being abraided to enhance electrical connection between the conductive fibers thereof and the conductive fibers of said workpiece intersecting the periphery of the aperture in said workpiece whereby electrical continuity is provided by the cap on said bolt across the aperture in said workpiece.