Welded steel clamps securely grip structural shapes of various sizes for crane operations. The clamp has adjustable clamping jaws and screw-operated internal v-jaws and provides greater safety than hoisting slings presently used. The structural member can be rotated in any manner, angle, or direction without being released by the clamp

Reinhardt, E. C.

English

NASA Technical Reports Server

May 1966	 Brief 66-10176 
NASA TECH BRIEF	
a 
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. 
Lifting Clamp Positively Grips Structural Shapes 
The problem: 
To design a hoisting fixture capable of securely grip-
ping structural shapes of various sizes for crane oper-
ations. Slings currently in use do not provide a posi-
tive grip on structural members, thus permitting 
dangerous slipping and tilting of loads. 
The solution: 
A welded steel clamp with adjustable clamping jaws 
and screw-operated internal V-jaws for positive grip-
ping of structural members of many sizes.
How it's done: 
The main body of the clamp is slotted throughout 
its length to provide a guide for the two clamping 
jaws. Each jaw is locked in one of several basic posi-
tions along the guide by two load-bearing bolts pass-
ing through the main body and jaw. This variable 
positioning accommodates any size member up to the 
maximum size. For positive locking of a structural 
member, internal V-jaws within each clamping jaw are 
thrust securely against the structural flange by the 
tightening of adjustment bolts behind each V-jaw. 
JdWL	 (continued oserleaF) 
low
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=19660000175 2020-03-11T17:30:46+00:00Z
Two V-jaws are contained in clamping jaw A and one 
V-jaw is contained in clamping jaw B. 
Two hook flanges are welded to the main body at 
right angles, permitting the entire clamp assembly 
to be suspended from the hoisting device with the 
jaws in a horizontal or vertical position. 
Notes: 
1. This lifting clamp is designed to handle up to a 
20-foot length of 14-inch wide flange 1-beam. It 
has a working capacity of 2235 lb and has been 
proof loaded to 6700 lb. 
2. This innovation provides greater safety than hoist-
ing slings presently used. The structural member
can be rotated in any manner, angle, or direction 
and the clamp will not release. 
3. Inquiries concerning this innovation may be di-
rected to:
Technology Utilization Officer 
Marshall Space Flight Center 
Huntsville, Alabama, 35812 
Reference: B66-10176 
Patent status: 
No patent action is contemplated by NASA. 
Source: E. C. Reinhardt 
(M-FS-593) 
Brief 66-10176
	
Category 05


Lifting clamp positively grips structural shapes

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