Close out fitting

• US 4,958,743 A
• Filed: 05/18/1989
• Issued: 09/25/1990
• Est. Priority Date: 12/14/1987
• Status: Expired due to Term

• Current Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Original Assignee: Gerald W. Tyree, Randall C. Hatton
• Inventors: Hatton, Randall C., Tyree, Gerald W.
• Primary Examiner(s): NOT, DEFINED
• Application Number:
  US07/357,628
• Time in Patent Office: 495 Days
• Field of Search: 29/509, 29/522.1, 29/522.2, 29/523, 29/512, 29/460, 138/89, 138/91, 220/307, 220/288, 403/288, 403/265, 244/131, 244/135 R, 411/34, 411/35, 411/173, 411/177, 411/183, 411/500, 411/501, 411/504, 411/506, 137/247.47, 137/247.51
• US Class Current: 220/288
• CPC Class Codes: F16B 2200/60 Coupler sealing means
• CPC Class Codes: F16B 37/065 by deforming the material of the nut
• CPC Class Codes: Y10T 29/49888 Subsequently coating
• CPC Class Codes: Y10T 29/4992 by flaring inserted cup or tube end
• CPC Class Codes: Y10T 29/4994 Radially expanding internal tube
• CPC Class Codes: Y10T 403/47 Molded joint

Abstract

The invention is a close out fitting for installing in a structural element, the structural element having a port extending from a first surface to a second surface thereof, the port countersunk at both ends, and a method of installing the closeout fitting. In detail, the fitting comprises a hollow, tubular sleeve having a flared first end, a flarable second end and internal threads therebetween. The fitting further comprises a plug having a head portion and a shank portion attached to the head portion with the shank portion having external threads. The method of installing the close out fitting comprises the steps of forming a port through the structural elements, countersinking both ends of the port, providing a hollow sleeve having a flared first end and flarable second end and internal threads therebetween, installing the sleeve in the port such that the flared first end is in contact with one of the countersink ends of the port and the flarable second end extends into the other countersink end of the port, flaring the second end of the sleeve into contact with the other countersink end of the port locking the sleeve into the port, providing a plug having a head and a shank with the shank having external threads thereon, and installing the plug into the sleeve.

Claims

1. In a structure, the combination of:

a structural element, the structural element having a material injecting port extending from a first surface to a second surface thereof, said port countersunk at both its ends;

a hollow tubular sleeve installed in said port, said sleeve having flared ends in contact with said countersunk ends of said port, and flush with said first and second surfaces of said structural element, a length equal to the length of said port and internal threads located between said flared ends; and

a plug having external threads in removable engagement with said internal threads of said sleeve.

2. The combination as set forth in claim 1, wherein said sleeve includes a solid wall providing a barrier between said port wall and the interior of said sleeve.

3. The combination as set forth in claim 2, wherein said plug comprises:

a head portion, the length of said head portion being generally equal to or less than the length of said flared ends of said sleeve; and

a shank portion attached to said head portion, said shank portion having said external threads thereon.

4. The combination as set forth in claim 3, wherein the countersunk ends of said port have total included angles and said sleeve further including;

said flared ends of said sleeve having a total included angle substantially equal to said total included angle of said countersunk ends of said port; and

said head portion of said plug having a conically shaped underhead with a total included angle substantially equal to said total included angle of said countersunk ends; and

the height thereof is substantially equal to the length of said flared end portions of said sleeve.