Lathe chuck key with spring loaded plunger cannot inadvertently be left in the chuck when the lathe is started. The plunger automatically ejects the key from the chuck when hand pressure is released

Christman, G. L.

English

NASA Technical Reports Server

June 1966	 Brief 66-10243 
NASA TECH BRIEF	
Df 
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. 
Lathe Chuck Key Incorporates Safety Feature 
The problem: 
To design a lathe chuck key that cannot inad-
vertently be left in the chuck when the lathe is started. 
A key retained in a chuck would fly out on startup of 
the lathe and present a potential hazard to personnel 
and equipment in the shop area. 
The solution: 
A chuck key incorporating a spring loaded plunger
that automatically ejects the key from the chuck when 
hand pressure is released. 
How it's done: 
The spring loaded plunger is positioned in a hole 
drilled through a central portion of the key. To insert 
the key in the chuck, sufficient hand pressure must be 
exerted to overcome the spring load, and depress the 
plunger into the hole. When the pressure is released 
(continued overleaf) 
Ask
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=19660000242 2020-03-11T17:32:08+00:00Z
after the chuck is tightened, the plunger will eject	 Patent status: 
the key from the chuck.	 No patent action is contemplated by NASA. 
Note:	 Source: G. L. Christman 
Inquiries concerning this innovation may be di- 	 of North American Aviation, Inc. 
rected to:	 under contract to 
Technology Utilization Officer	 Manned Spacecraft Center 
Manned Spacecraft Center •	 (MSC-506)
Houston, Texas, 77058 
Reference: B66-10243 
Brief 66-10243	 Category 05


Lathe chuck key incorporates safety feature

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