Plastic encapsulated nut and washer assembly

• US 4,883,399 A
• Filed: 12/05/1988
• Issued: 11/28/1989
• Est. Priority Date: 12/05/1988
• Status: Expired due to Term

• Current Assignee: MacLean-Fogg Company
• Original Assignee: MacLean-Fogg Company
• Inventors: MacLean, Barry L.
• Primary Examiner(s): Wilson, Neill R.
• Application Number:
  US07/280,140
• Time in Patent Office: 358 Days
• Field of Search: 411/371, 411/372, 411/375, 411/377, 411/429, 411/431, 411/910, 411/368, 411/908, 10/86 C
• US Class Current: 411/431
• CPC Class Codes: F16B 3/00 Key-type connections; Keys F16B2/00 takes precedence; for rods or tubes mutually F16B7/00
• CPC Class Codes: F16B 33/004 Sealing; Insulation by means of washers F16B43/001
• CPC Class Codes: F16B 33/006 Non-metallic fasteners using screw-thread
• CPC Class Codes: F16B 37/14 Cap nuts; Nut caps or bolt caps
• CPC Class Codes: F16B 39/26 with spring washers fastened to the nut or bolt-head
• CPC Class Codes: F16B 43/00 Washers or equivalent devices; Other devices for supporting bolt-heads or nuts circlips F16B21/18; for indicating tensile load F16B31/02; forming a whole with the bolt or nut F16B33/00; locking bolts or nuts by means of a fixed plate or ring, or washer-like resilient plates F16B39/10, F16B39/24
• CPC Class Codes: Y10S 411/908 Resinous material
• CPC Class Codes: Y10S 411/91 Antitamper means

Abstract

A plastic encapsulated nut and washer assembly includes a plastic retainer or body for holding a hex nut and washer in axially aligned abutting relation ready for assembly with an external threaded member. A portion of the plastic retainer provides an annular seal around the washer when the nut is tightened on a threaded member and an extension bore is formed in the plastic material for providing a lock-nut function when the threaded member is extended into the extension bore from the threaded bore of the hex nut.

Claims

1. A fastener assembly comprising:

a nut having a face and a threaded bore intersecting said face;

a washer abutting said face having a central bore aligned with said threaded bore; and

a body of plastic material permanently molded on said nut and encapsulating at least a portion of said nut and washer for retaining said washer in abutting relation to said face of said nut with said bore exposed to receive a threaded element engaging said threaded bore of said nut, said plastic body having an external surface for receiving tool means for turning said nut while threadedly engaging said threaded element.

2. The fastener of claim 1, wherein:

said body includes means for loosely holding said washer abutting said face of said nut to permit free relative rotation therebetween.

3. The fastener of claim 1, wherein:

said body includes an annular lip extending outwardly around said washer for sealing said fastener against an adjacent surface.

4. The fastener of claim 1, wherein:

said nut includes planar sides forming a polygonal cross section transversely of said threaded bore; and

said body includes sides spaced outwardly of said sides of said nut to form a shape for receiving tool means applied to turn said fastener assembly on said threaded element.

5. The fastener of claim 4, wherein:

said body includes an annular ring around said washer intersecting said sides of said polygonal shape providing a wrench stop.

6. The fastener of claim 1, wherein:

said body includes an extension bore in coaxial alignment with said threaded bore of said nut extending outwardly of a face of said nut opposite said face abutting said washer.

7. The fastener of claim 6, wherein:

said body is formed of resilient plastic material and said extension bore is dimensioned to provide a lock nut function when engaged by a threaded element extending from said threaded bore of said nut.

8. The fastener of claim 7, wherein:

said body includes a cap portion closing off an outer end of said extension bore for protecting said threaded element.

9. The fastener of claim 7, wherein:

said extension bore is initially cylindrical in shape and has a diameter less than the outer thread diameter of said threaded element and greater than the root diameter thereof.

10. A nut and washer assembly, comprising:

a metal nut having a threaded bore extending between opposite end faces and having planar sides extending between said end faces forming a polygonal cross-section transversely of said threaded bore;

a metal washer having a central opening aligned with said threaded bore of said nut to receive a threaded member extended through said washer; and

a body member formed of plastic material permanently affixed on said metal nut and having a first cavity for holding said nut, said body member having a second cavity having an open side facing away from said first cavity for holding said washer in abutting relation against an end face of said nut, said body member having external surface means for receiving a tool for turning said assembly on said threaded member when extended through said washer into said threaded bore of said nut.

11. The nut and washer assembly of claim 10, wherein:

said open side of said second cavity is formed by a washer retaining lip extending inwardly of an outer periphery of said washer toward said central bore and adapted to form a seal around said washer when said nut is pressed toward an adjacent surface upon tightening on said threaded member.

12. The nut and washer assembly of claim 11, wherein:

said body member includes a cylindrical ring around said second cavity and has a polygonal shaped cross-section body portion outwardly of said first cavity with planar surfaces outwardly parallel of said sides of said nut for receiving a wrench for tightening said nut on said threaded member.

13. The nut and washer assembly of claim 12, wherein:

said cylindrical ring of said body projects outwardly of said polygonal shaped cross-section body portion to form a stop surface for engaging a wrench applied to said body portion for tightening said nut on said threaded member.

14. The nut and washer assembly of claim 12, wherein:

said second cavity is positioned inside said cylindrical ring and is dimensioned to permit free rotation of said washer in said body relative to said nut.

15. The nut and washer assembly of claim 12, wherein:

said body includes a cap wall closing off said threaded bore of said nut on a side opposite of said washer.

16. The nut and washer assembly of claim 15, wherein:

said cap wall defines an extension bore coaxially aligned with said threaded bore of said nut.

17. The nut and washer assembly of claim 16, wherein:

said extension bore is dimensioned to engage outer portions of said threaded member extending through said nut for restraining relative rotation of said nut and threaded member.

18. A nut and washer assembly, comprising:

a hex nut;

a washer aligned and abutting a face of said hex nut; and

a plastic retainer permanently molded around said nut and washer for holding said hex nut and washer in aligned and abutting relation and including an external surface engageable with a tool for turning said assembly on a threaded member.

19. The nut and washer assembly of claim 18, wherein:

said retainer includes annular seal means around a peripheral edge of said washer

20. The nut and washer assembly of claim 19, wherein:

said retainer includes a bore aligned with a threaded bore of said hex nut for lockingly engaging the threads of said threaded member engaged in said threaded bore.