Transmitter allows transmission of rotational or single planar arc motion through hermetically sealed chamber without use of dynamic seals or complex mechanisms. Device may interest pressure vessel designers and those who need to isolate equipment from a hostile environment

Eckert, R. L.

English

NASA Technical Reports Server

SHAFT 
BLE BAR 
August 1971	 Brief 71-10328 
NASA TECH BRIEF 
Manned Spacecraft Center 
NASA Tech Briefs announce new technology derived from the U.S. space program. They are issued to encourage 
commercial application. Tech Briefs are available on a subscription basis from the National Technical Information 
Service, Springfield; Virginia 22151. Requests for individual copies or questions relating to the Tech Brief program may 
be directed to the Technology Utilization Office, NASA, Code KT, Washington, D.C. 20546. 
Hermetically Sealed Motion Transmitter
CONVOLUTED	 FLEX MEMBER 
FLEX	 SOLDERED OR BRAZED 
MEMBER	 TO THE HOUSING 
An hermetically sealed motion transmitter has 
been developed which allows transmission of rotational 
or single planar arc motion through an hermetically 
sealed chamber without the use of dynamic seals or com-
plex mechanisms. 
Motion is transmitted between two shafts on the 
same axis using a wobble bar that has its end points cap-
tive in crank arms. A convoluted member of a highly 
flexible fatigue-resistant metal (e.g., berrylium copper) is 
soldered or brazed to the shaft at the wobble axis and to 
the housing, thus forming a seal without the use of dy-
namic seals. 
Each design application is limited to a maximum 
pressure differential. Excellent operating life can be ex-
pected with the proper design ratio of the radius of the 
crank arm, the length of the bar and the diameter of the 
convoluted member. 
This device may be of interest to pressure vessel 
designers and those who need to isolate equipment from 
a hostile environment. 
Note:
No additional documentation is available. Specific 
questions, however, may be directed to: 
Technology Utilization Officer 
Manned Spacecraft Center, Code JM7 
Houston, Texas 77058 
Reference: B71-10328 
Ah	 (continued overleaf) 
This document was prepared under the sponsorship of the National 
Aeronautics and Space Administration. Neither the United States 
Government nor any person acting on behalf of the United States
Government assumes any liability resulting from the use of the 
information contained in this document, or warrants that such use 
will be free frbm privately owned rights.
https://ntrs.nasa.gov/search.jsp?R=19710000326 2020-03-17T02:28:43+00:00Z
Patent status: 
No patent action is contemplated by NASA. 
Source: Robert L. Eckert 
North American Rockwell 
under contract to
Manned Spacecraft Center 
(MSC-1 7348)
. 
Brief 71-10328	 Category 07


Hermetically sealed motion transmitter

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