High pressure bellows has high strength rigid hoops for strength and stability and sheet stock for low spring rate effects. The simplicity of this bellows design facilitates mass production

Lusic, R. F.

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NASA Technical Reports Server

Metal Cony
May 1966	 Brief 66-10190 
NASA TECH BRIEF 
NASA Tech Briefs are issued to summarize specific innovations derived from the U. S. space 
program and to encourage their commercial application. Copies are available to the public from 
the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151. 
Bellows Design Features Low Spring Rate and Long Life 
Inner Hoop 
Outer Hoop 
The problem:	 remains stable since the hoops do not deform under 
	
To design a high pressure bellows that is economical 	 pressure application. This bellows has long life be-
to produce, has a low spring rate, and is sensitive to 	 cause the flexible sheet stock is protected from stress 
pressure and temperature changes. Present high pres-	 fatigue at its bend radii. 
sure bellows have high corresponding spring rates, are 	 Notes: 
insensitive to small pressure changes, and exhibit un-
stable cross-sectional diameters. 
The solution:	 2. 
A bellows that combines high strength rigid hoops 
for strength and stability with sheet stock for low 
spring rate effects.	 Patent status: 
How it's done:	 No patent action is contemplated by NASA. 
	
Sheet metal convolutes are welded to alternate rigid 	 Source: R. F. Lusic 
inner and outer hoops. The hoop skeleton structure	 of North American Aviation, Inc. 
withstands high pressures while supporting flexible	 under contract to 
sheet stock convolutes that provide the low spring 	 Manned Spacecraft Center 
rate to give the bellows long life. The bellows diameter
	
	 (MSC-521)
Category 05 
This document was prepared under the sponsorship of the National 	 Government assumes any liability resulting from the use of the 
	
Aeronautics and Space Administration. Neither the United States 	 information contained in this document, or warrants that such use 
	
Government nor any person acting on behalf of the United States	 will be free from privately owned rights. 
The simplicity of this bellows design facilitates 
manufacture by mass production methods. 
This development is in conceptual stage only, and 
as of date of publication of this Tech Brief, neither 
a model nor prototype has been constructed. 
Weld Points
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Bellows design features low spring rate and long life

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