Compression fit EME protection seal cap

Patent metadata

Field	Value
Publication number	US-11754111-B2
Application number	US-202016819605-A
Country	US
Kind code	B2
Filing date	Mar 16, 2020
Priority date	Mar 16, 2020
Publication date	Sep 12, 2023
Grant date	Sep 12, 2023

Abstract

A protection seal cap for enclosing an end portion of a fastener which extends from a structure, which includes a cap member, which includes a sidewall that defines an interior space within the cap member. The sidewall forms a continuous wall member positioned within the cap member. The continuous wall member defines an opening providing access to the interior space. The continuous wall member is configured to create an interference compression fit between the end portion of the fastener and the continuous wall member.

First claim

What is claimed:

1. A protection seal cap for enclosing an end portion of a fastener which extends from a structure, the protection seal cap comprising:
a cap member including a sidewall that defines an interior space within the cap member, wherein:
the sidewall forms a continuous wall member positioned within the cap member;
the continuous wall member defines an opening that provides access to the interior space, wherein the continuous wall member includes an inner surface facing the opening to present an outer boundary of the opening, and wherein the inner surface is a continuously flat configuration around the opening; and
the continuous wall member is configured to create an interference compression fit between the end portion of the fastener and the continuously flat configuration of the inner surface of the continuous wall member.

2. The protection seal cap of claim 1 , wherein the sidewall has a width dimension greater than a first width dimension of the continuous wall member.

3. The protection seal cap of claim 1 , wherein the continuous wall member extends in a direction away from the sidewall of the cap member which defines the interior space.

4. The protection seal cap of claim 3 , wherein:
the continuous wall member has a first end surface; and
the first end surface of the continuous wall member is positioned within a first plane.

5. The protection seal cap of claim 1 , wherein the sidewall forms a wall member positioned spaced from the continuous wall member.

6. The protection seal cap of claim 5 , wherein the wall member extends in a direction away from the sidewall of the cap member which defines the interior space.

7. The protection seal cap of claim 6 , wherein:
the wall member has a second end surface; and
the second end surface is configured such that the second end surface extends within a second plane.

8. The protection seal cap of claim 7 , wherein a channel is positioned extending about the continuous wall member and positioned between the continuous wall member and the wall member.

9. The protection seal cap of claim 8 , wherein the wall member defines two ports such that the two ports are in fluid communication with the channel, and wherein the two ports are spaced apart from each other.

10. The protection seal cap of claim 9 , wherein the two ports are each positioned on opposing sides of the cap member, and the two ports have substantially the same configuration.

11. The protection seal cap of claim 9 , wherein:
a first flow path extends from outside of the cap member through a first port of the two ports and into the channel; and
a second flow path extends from inside of the channel to a second port of the two ports and through the second port to outside of the cap member.

12. The protection seal cap of claim 1 , wherein the fastener is constructed of a harder material than that of a material which constructs the continuous wall member.

13. The protection seal cap of claim 1 , wherein:
the end portion of the fastener engages the inner surface of the continuous wall member at a plurality of contact locations spaced from each other around the opening to create the interference compression fit;
the continuous wall member has a first thickness around the opening at the contact locations between the end portion of the fastener and the inner surface of the continuous wall member;
the continuous wall member has a second thickness around the opening at a plurality of non-contact locations spaced from the contact locations; and
the second thickness is greater than the first thickness.

14. The protection seal cap of claim 1 , wherein:
the continuous wall member has a triangular-circular cross-sectional configuration defined by a plurality of side walls spaced from each other and a plurality of curved walls;
each one of the curved walls is disposed between a respective pair of the side walls;
the end portion of the fastener engages the inner surface of the continuous wall member at a plurality of contact locations spaced from each other to create the interference compression fit;
each of the contact locations are disposed along a respective one of the side walls of the triangular-circular cross-sectional configuration; and
each of the curved walls include a non-contact location spaced from the contact locations, and the non-contact location of each of the curved walls form a gap between the end portion of the fastener and the inner surface of the continuous wall member when the end portion of the fastener engages the inner surface of the continuous wall member at the contact locations.

15. The protection seal cap of claim 1 , wherein:
the sidewall includes a wall member positioned spaced apart from the continuous wall member to define a channel between the wall member and the continuous wall member;
the wall member extends outwardly away from the sidewall to a distal end surface; and
the wall member defines a plurality of ports that intersect the distal end surface.

16. A method for holding a protection seal cap against a structure and enclosing an end portion of a fastener which extends from the structure, the method comprising:
positioning a cap member of the protection seal cap over the end portion of the fastener wherein:
the cap member includes a sidewall which defines an interior space within the cap member;
the sidewall forms a continuous wall member positioned within the cap member; and
the continuous wall member defines an opening that provides access to the interior space, wherein the continuous wall member includes an inner surface facing the opening to present an outer boundary of the opening, and wherein the inner surface is a continuously flat configuration around the opening; and

deforming the continuous wall member to create an interference compression fit between the continuously flat configuration of the inner surface of the continuous wall member and the end portion of the fastener.

17. The method of claim 16 , wherein:
the sidewall includes a wall member that extends outwardly away from the sidewall to a distal end surface, and the wall member defines a plurality of ports that intersect the distal end surface; and
the positioning of the cap member further includes positioning the cap member against the structure such that the distal end surface of the wall member abuts the structure.

18. The method of claim 16 ,
wherein the sidewall forms a wall member positioned spaced apart from the continuous wall member to define a channel therebetween;
wherein the wall member extends about the continuous wall member;
wherein the wall member defines a plurality of ports which extend through the wall member and are in fluid communication with the channel; and
further including injecting sealant into the channel through one of the ports.

19. The method of claim 16 , wherein:
the continuous wall member has a triangular-circular cross-sectional configuration defined by a plurality of side walls spaced from each other and a plurality of curved walls;
each one of the curved walls is disposed between a respective pair of the side walls;
deforming the continuous wall member to create the interference compression fit further includes engaging the end portion of the fastener with the inner surface of the continuous wall member at a plurality of contact locations along the side walls to create the interference compression fit; and
each of the curved walls include a non-contact location spaced from the contact locations, and the non-contact location of each of the curv

Assignees

• Boeing Co

Inventors

• Cowan Daniel J
• Stevens Bart

Classifications

• B64D45/02 Primary

  Lightning protectors; Static dischargers · CPC title

• F16B37/14 Primary

  Cap nuts; Nut caps or bolt caps · CPC title

• F16B33/004

  Sealing; Insulation (by means of washers F16B43/001) · CPC title