Releasable pin-type toggle bolt fastener is constructed so that, when positioned in hole, toggle action prevents its removal and locknut anchors it firmly in place. Fastener is easily removed by loosening locknut and retraction of toggle wings

Kubokawa, C. C.

English

NASA Technical Reports Server

December L'()	 Brief 70-10509 
NASA TECH BRIEF 
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 progam may be directed to the Tech-
nology Utilization Division, NASA, Code UT, Washington, D.C. 20546. 
Eas y Insert, Eas y Release Toggle Bolt Fastener 
The problem:	 a threaded hack end to receive the locknut and de-
To facilitate assembly tasks, such as the fastening 	 sired attachments (tie-down ring, hand hold, snap 
or release of two or more objects.	 ring, etc.). Slots in the cylindrical body act as recep- 
The solution:	 tacles for two or more toggle wings (or detents) which 
are held in place b y
 pins. The toggle wings are cx- 
An easily releasable pin-type toggle bolt fastener
	 tended except when the spring loaded central actuator 
coristucted so that, when it is positioned in a hole,
	
	 is d e r—sed F' 
To insert the fastener into a hole, the actuator pin 
is depressed, causing the toggle wings to retract. When 
the fastener is in place, the actuator pin is released and 
the toggle wings expand, preventing the fastener from 
being removed. The fastener is secured by screwing the 
0	
locknut down firmly, thus exerting a compressive 
- force between the locknut and the toggle wings. With 
the threaded portion of the cylindrical body function-
ing as a stud, a suitable attachment (tie-down ring, 
L	 hand hold, snap ring, etc.) may be screwed on. 
JTo remove the fastener from the hole, the locknut 
is loosened and the exposed portion of the central 
actuator pin is depressed, causing the toggle wings to 
retract. 
Possible uses of the device include fastening items 
to a wall or deck where simultaneous access to both 
sides of the wall or deck is not possible, or fastening 
H	 two surfaces of opposite curvature: i.e., a concave sur-
face to a convex surface. 
Note: 
Tie-Down Ring	
Requests for further information may be directed 
toggle action prevents its remo al. A locknut anchors 
it firmly in place. 
Ho" its done: 
The cylindrical body of the fastener (see fig.) has 
a tapered head to facilitate entry into the hole, and
to:
Technology Utilization Officer 
Ames Research Center 
Moffett Field, California 94035 
Reference: TSP70- 10509 
Patent status: 
This invention has been patented by NASA (U.S. 
Patent No. 3,534,650), and royalty-free license rights 
Ct)IIiIilljCti Olerlejj
 
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.
https://ntrs.nasa.gov/search.jsp?R=19700000491 2020-03-17T00:34:40+00:00Z
will be granted for its commercial development. In-
quiries about obtaining a license should be addressed 
to:
Patent Counsel 
Mail Code 200-11 A 
Ames Research Center 
Moffett Field, California 94035 
Source: C. C. Kubokawa
Ames Research Center 
(ARC-10140) 
Brief 70-10509	 Category 07


Easy insert, easy release toggle bolt fastener

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