Sealing capped nut and bolt therefor

• US 4,490,083 A
• Filed: 08/27/1981
• Issued: 12/25/1984
• Est. Priority Date: 01/10/1980
• Status: Expired due to Fees

• Current Assignee: Russell Burdsall & Ward Corporation
• Original Assignee: Russell Burdsall & Ward Corporation
• Inventors: Rebish, Edward J.
• Primary Examiner(s): Holko, Thomas J.
• Application Number:
  US06/296,574
• Time in Patent Office: 1,216 Days
• Field of Search: 411/338, 411/339, 411/360, 411/366, 411/367, 411/368, 411/369, 411/429, 411/430, 411/431, 411/432, 411/531, 411/542, 411/546, 411/901, 411/902, 411/903, 411/907, 411/908
• US Class Current: 411/338
• CPC Class Codes: F02G 2242/42 having a single piston regenerative displacer attached to the piston, e.g. "Gifford-McMahon" engines
• CPC Class Codes: F16B 33/004 Sealing; Insulation by means of washers F16B43/001
• CPC Class Codes: F16B 37/122 Threaded inserts, e.g. "rampa bolts"
• CPC Class Codes: F16B 5/02 by means of fastening members using screw-thread F16B5/0004 takes precedence; construction of screw-threaded connections F16B25/00 - F16B39/00
• CPC Class Codes: Y10S 411/902 Metal core
• CPC Class Codes: Y10S 411/907 Elastomeric

Abstract

Disclosed is a new fastening system particularly for fastening of fiber-reinforced polyester/plywood panels 14 to metallic structural members 16 in sealing engagement through apertures 18. The system has a sealing capped nut 10 for receiving in threaded engagement a bolt 12. Upon such engagement a formable shank portion 40 of the sealing capped nut 10 is deformed in a designed fashion to form a seal between the bolt 12 and the aperture 18 opening.

Claims

1. A fastener system for sealing and fastening apertured articles comprising first and second members providing interfitting means operable when said members are assembled to secure said members together, each member providing a clamping face which cooperate when said members are assembled and interconnected by said interfitting means to engage and clamp against opposite surfaces of said articles, one of said members providing a reduced diameter shank extending from its clamping face proportioned to extend into said apertures in said articles and providing a single-layer tubular end having a substantially uniform diameter formed of deformable material, said shank having a length greater than the length of said apertures in said articles, said clamping face on the other of said members providing roll hem forming means operating when said members are assembled to radially deform said tubular end and produce a radially extending peripherally continuous rolled hem having at least two radially extending layers which engages the adjacent surface of said article around said aperture and is clamped into sealing engagement therewith by said clamping face of said other member, said one member operating to produce a seal with the adjacent surface of said articles around said apertures and in cooperation with said shank thereof and said hem to create a full seal of said apertures when said members are assembled.

2. A fastener system as set forth in claim 1, wherein said interfitting means are threads operating when said members are threaded together to move said clamping faces toward each other and cause said hem to be formed by said hem forming means.

3. A fastener system as set forth in claim 2, wherein said shank is sized to fit said apertures with an interference fit which operates to prevent rotation of said one member when said members are threaded together by rotation of said other member.

4. A fastener system as set forth in claim 3, wherein said shank is formed with a taper providing progressively decreasing external shank size at locations progressively spaced from said clamping face thereof.

5. A fastener system as set forth in claim 2, wherein said one member is a nut formed with a female thread and said other member is a bolt provided with male threads operable to mate with said female threads.

6. A fastener system as set forth in claim 2, wherein said one member is a bolt providing a male thread along said shank and said other member is a nut providing a female thread.

7. A fastener system as set forth in claim 1, wherein said hem forming means is an annular recess in said clamping face of said other member operable when said members are moved toward each other to engage the end of said tubular portion and radially deform said end to produce said hem.

8. A fastener system as set forth in claim 7, wherein said annular recess is formed with a radius sized to cause a rolled hem.

9. A fastener system as set forth in claim 7, wherein said recess provides a relatively sharp corner which operates to fold said end of said tubular portion back along the outer surface thereof to produce an axial extending preliminary double layer hem, said recess also providing a radially extending surface operable thereafter to radially deflect said double layer hem to produce a radially extending hem consisting of two radially extending layers.

10. A fastener system as set forth in claim 2, wherein said hem forming means operates to engage the end of said tubular portion and cause said tubular portion to fold back upon itself until said end engages the adjacent side of said articles to form an axially extending double layer hem, said hem forming means thereafter operating to radially deform said axially extending double layered hem to a radial direction to produce a radially extending double layer hem adjacent to the adjacent surface of said articles.

11. A fastener for sealingly fastening apertured members together comprising:

a bolt, said bolt having a bolt head, said bolt head having a drive means for driving said bolt, said bolt having a reduced diameter shank extending from said bolt head, said bolt head having an annular recess in said bolt head for clamping a hem in sealing engagement with the members to be fastened;

a sealing capped nut, said sealing capped nut being made of a polymeric material, said sealing capped nut having a head providing clamping face and a reduced diameter thick wall shank portion consisting of an engagement insert of a metallic substance for threadably engaging said bolt, said sealing capped nut having a thin wall tubular shank portion, said recess comprising roll hem forming means operating when the bolt and capped nut are assembled to radially deform said thin wall shank portion to produce a radially extending peripherally continuous rolled hem having at least two radially extending layers for sealing engagement with said bolt and the apertured members.

12. A fastener for sealingly fastening apertured members together as set forth in claim 11, wherein said bolt shank provides a broadened portion near said bolt head, said thin wall shank portion engaging said broadened portion to form said hem within said recess.

13. A fastener for sealingly fastening apertured members together according to claim 11, wherein said bolt also has a tapped center for receiving in threaded engagement means for fastening cargo to the members.

14. A fastener for sealingly fastening apertured members together according to claim 11, wherein said internal drive means in said bolt is in the threaded end of said bolt and said sealing capped nut is tapped through to allow insertion of a tool therethrough to drive said bolt by means of said internal drive means in said bolt.

15. A fastener for sealingly fastening apertured members together according to claim 14, the threaded portion of said bolt has a breakaway portion such that upon tightening to a predetermined amount the threaded portion of said bolt breaks off substantially flush with said sealing capped nut.

16. A fastener for sealingly fastening apertured members according to claim 11, wherein said at least one of said heads has a drill-out dimple centered on the exposed face thereof.

17. A fastener for sealingly fastening apertured members according to claim 11, wherein said nut head has a tightness bulbous on the interior thereof for indicating by external visual inspection the tightness of the engaged bolt.

18. A sealing capped nut according to claim 11, wherein said thin wall shank portion has a bellows expander to allow for various thicknesses of members to be fastened together.

19. A fastener as set forth in claim 11, wherein said bolt is operable to form said hem to include a pair of radially extending substantially flat layers deformed from said thin wall shank portion.