Ball bearing standoffs added to drafting instruments enable the instruments to be moved about, with their surfaces out of contact with the drawing paper. This provides a safeguard against smearing of the lines

Rennie, T. A.

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NASA Technical Reports Server

CED 
August 1967	 Brief 67-10283 
NASA TECH BRIEF 
NASA Tech Briefs are issued to summarize specific innovations derived from the U.S. space program, 
to encourage their commercial application. Copies are available to the public at 15 cents each 
from the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151. 
Concept for Modifying Drafting Instruments to Minimize Smearing 
Bearing Assembly 
Bearing Assembly
Hetaining Rings
	 Ball Bearing (PTFE)	 (PTFE) 
Drafting instruments, such as triangles, T-squares, 
and French curves in normal use tend to cause smear-
ing of the ink or pencil lines on a drawing. Ball 
bearing standoffs added to the instrument, as illus-
trated for a triangle, would enable the instrument to 
be moved about, with its surface out of contact with 
the drawing paper and thus provide a safeguard 
against smearing of the lines. 
Note: 
This innovation is only in the conceptual stage; 
neither a model nor a prototype has been constructed 
as of the date of this Tech Brief.
Patent status: 
No patent action is contemplated by NASA. 
Source: T. A. Rennie 
of The Boeing Company 
under contract to 
Kennedy Space Center 
(KSC- 10056) 
Category 05 
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 from privately owned rights.
https://ntrs.nasa.gov/search.jsp?R=19670000283 2020-03-11T20:37:17+00:00Z


Concept for modifying drafting instruments to minimize smearing

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