LOW-INTERFERENCE SEEKER DOME ATTACHMENT

• US 3,757,698 A
• Filed: 02/28/1972
• Issued: 09/11/1973
• Est. Priority Date: 02/28/1972
• Status: Expired due to Term

• Current Assignee: Michael D. Jacobson
• Original Assignee: Michael D. Jacobson
• Inventors: Jacobson, Michael D.
• Primary Examiner(s): Borchelt, Benjamin A.
• Assistant Examiner(s): Tudor, H. J.
• Application Number:
  US05/229,840
• Time in Patent Office: 561 Days
• Field of Search: 102/70.2,105,79,56 285/390,187 343/872
• US Class Current: 244/131
• CPC Class Codes: F42B 10/46 Streamlined nose cones; Windshields; Radomes F42B12/105 takes precedence

Abstract

Attachment means for positioning a dome upon the airframe of a guided missile. An attachment ring is chemically bonded to the interior of a glass dome. The attachment ring has interior threads which match exterior threads on the steel airframe of the missile. The ring is made of a low thermal expansion alloy. The thread interface has a pitch angle of Beta . As the threads of the airframe move with respect to the threads of the attachment ring due to thermal expansion or contraction the movement will be parallel to the thread face. This parallel motion will induce only frictional forces across the thread interface causing negligible stresses in the ring and airframe.

Claims

1. A nose cone in combination with the air frame of a guided missile comprising:

threads on said frame;

threads on said cone;

said threads meshing with one another;

the interface of said threads being at a pitch angle of Beta whereby thermal expansion will result in motion parallel to said interface;

said angle Beta being equal to arctan (Zavg/Ravg) where Zavg equals the average distance of the edge of said frame thread from the dome seat on said frame and parallel to said axis and Ravg equals the radial distance of said frame thread edge from said axis.

2. The combination of claim 1 wherein said cone threads are on an attachment ring which is secured to said cone.

3. The combination of claim 2 wherein said ring is located on the interior of said cone whereby said ring is isolated from the air stream to lessen the thermal effects on said ring.

4. The combination of claim 2 wherein said ring is attached to said cone by a chemical bond.

5. The combination of claim 2 wherein said ring is made of a low thermal expansion alloy.