Jig for forming sealant layer for lightning protection fastener, method for forming sealant layer for lightning protection fastener, lightning protection fastener, and wing of aircraft

Patent metadata

Field	Value
Publication number	US-2015298819-A1
Application number	US-201414166278-A
Country	US
Kind code	A1
Filing date	Jan 28, 2014
Priority date	Jan 29, 2013
Publication date	Oct 22, 2015
Grant date	—

Abstract

To provide a jig for forming a sealant layer for a lightning protection fastener which enables to quickly and accurately obtain a sealant layer having a required thickness. A guide jig 30 is used to form a sealant layer 29 around a fastener member 24 that passes through and fastens a plurality of members constituting an airframe of an aircraft, the jig including: a cup 31 including a cavity 33 to be filled with an uncured sealant 28 ; and a guide that is provided within the cavity 33 and engaged with the fastener member 24 so as to match a center axis of the cavity 33 with a center axis of the fastener member 24.

First claim

What is claimed is:

1 . A jig for forming a sealant layer for a lightning protection fastener, the lightning protection fastener comprising a fastener member that passes through and fastens a plurality of members constituting an airframe of an aircraft, and an insulating sealant layer that is formed around the fastener member, the jig comprising:
a cup including a cavity to be filled with an uncured sealant; and a guide that is provided within the cavity and engaged with the fastener member of the lightning protection fastener so as to match a center axis of the cavity with a center axis of the fastener member.

2 . The jig according to claim 1 , wherein the guide includes a rod-shaped guide pin arranged at the center axis of the cavity.

3 . The jig according to claim 1 , wherein the guide includes a plurality of guide fins arranged radially within the cavity.

4 . The jig according to claim 1 , wherein the guide is removably attached to the cup.

5 . The jig according to claim 1 , wherein a handle is formed on the cup or the guide.

6 . A method for forming a sealant layer for a lightning protection fastener by using a jig,
the lightning protection fastener comprising: a fastener member that passes through and fastens a plurality of members constituting an airframe of an aircraft; and an insulating sealant layer that is formed around the fastener member, the jig comprising: a cup including a cavity to be filled with an uncured sealant; and a guide that is provided within the cavity and engaged with the fastener member of the lightning protection fastener so as to match a center axis of the cavity with a center axis of the fastener member, the method comprising: a step A of filling the cavity of the cup with the sealant; and a step B of mounting the cup filled with the sealant to the fastener member while the guide is engaged with the fastener member so as to match the center axis of the cavity with the center axis of the fastener member.

7 . The method according to claim 6 , further comprising
a step C of filling an airspace formed by the cup and the guide with an uncured sealant after the step B.

8 . The method according to claim 6 , wherein before the step B, a region around a portion of the fastener member to be insulated is coated with another sealant having lower viscosity than the sealant to be fed in the cup.

9 . A lightning protection fastener comprising a fastener member that passes through and fastens a plurality of members constituting an airframe of an aircraft, and an insulating sealant layer that is formed around the fastener member,
wherein the sealant layer is formed by using the method according claim 6 .

10 . A wing of an aircraft comprising the lightning protection fastener according to claim 9 .

Assignees

• Mitsubishi Aircraft Corp

Inventors

• Yamakoshi Hideo
• Asahara Yuji
• Nishimura Wataru
• Tarumi Takeyasu
• Takata Noritomo
• Kawaguchi Jun
• Rikukawa Hiroshi
• Okumura Tomonori
• Nomiya Kengo

Classifications

• F16B33/004

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

• F16B37/14

  Cap nuts; Nut caps or bolt caps · CPC title

• B64D45/02 Primary

  Lightning protectors; Static dischargers · CPC title

• B23P11/00

  Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for  (connecting sheet metal or metal tubes, rods or profiles B21D39/00; riveting B21J; soldering, unsoldering, welding B23K; hand tools for connecting wire or strip B25B25/00; connecting metal parts by adhesives F16B11/00) · CPC title