Modified spanner wrench with a heavy hammer-piece hinged to its handle allows one hand removal of a tool from a chuck

Martino, J. A.

Seid, S.

English

NASA Technical Reports Server

' September 1969	
-	 Brief 69-10398 
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. 
One-Handed Hammer-Spanner for Chucks 
Spanner
Hammer-Piece 
1 ------------
- - 
Rotation required to lock and 
unlock the chucks by shock 
of Pratt and Whitney and Dixi 
jig borers. 
The problem: 
To develop a modified spanner wrench that can be 
used with one hand for removal of a tool from a chuck. 
Two hands are generally needed to hold the standard 
wrench and strike it with a hammer. 
The problem: 
A novel spanner having a heavy hammer-piece 
hinged to its handle. One hand is left free to grasp 
the released tool. A tool falling from the chuck may 
damage either itself or the workpiece. 
How it's done: 
With the spanner, held in one hand, engaging the 
chuck, the same hand causes the hammer-piece to 
tap the handle of the spanner and so loosen the 
chuck. The other hand is thus free to grasp the 
released tool. The hammer-piece may be of any 
suitable metal such as steel or aluminum.
Notes: 
1. No similar wrench is available. 
2. The standard spanner wrench has widespread use, 
and this modification should be of interest to the 
machining, fastener and bearing industries. 
3. No further documentation is available. Inquiries 
may be directed to: 
Technology Utilization Officer 
Marshall Space Flight Center 
Huntsville, Alabama 35812 
Reference: B69-10398 
Patent status: 
Inquiries about obtaining rights for the commer-
cial use of this invention may be made to NASA, 
Code GP, Washington, D. C. 20546. 
Source: J. A. Martino and Steven Seid of

North American Rockwell Corporation

under contract to

Marshall Space Flight center

(MFS-18581)
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.
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One-handed hammer-spanner for chucks

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