Iris-leaf core retainer insures retention of a complete sample within the drill string. Individual overlapping leaves will not rupture or tear out when they come in contact with the oncoming core

Olivari, H.

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NASA Technical Reports Server

Chicago Latrobe Drwg. No. CL-
CL- 147 7 (Reg.)	 I	 I - 
.
tion Direction 
September 1969	 Brief 69-10496 
NASA TECH BRIEF 
NASA Teèh 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. 
Iris-Leaf Core Retainer for a Surface Drill 
The problem:	 dividual leaves permanently set at an angle of 28° 
To., devise an iris-leaf core retainer for a surface 	 with the vertical. Extensions of the leaves are spot-
drill. This retainer could be particularly useful in 	 welded to the main body within the core drill string in 
mining explorations. A modification of it could also 	 order to maintain leaf overlap. This overlap feature 
trap and maintain liquids and gases. 	 eliminates the possibility of the oncoming core seizing 
- The solution:	 one or more of the leaves, which inevitably would 
cause failure of the core-retention capability. An iris-leaf retainer to insure the retention of a When the assembly is not operating, it has a conical 
complete sample within the drill string. Because of a
configuration. As the drill string is inserted into the 
unique overlapping feature, the individual leaves will 
not rupture or tear out when they come in contact
	
	
ground surface, however, the oncoming core forces 
the individual leaves to bend upward and form around 
with the oncoming core. In addition, this feature will
the inside periphery of the drill string. The total prevent the individual leaves from mixing or turn-
thickness of the leaves (0.020 in.) is less than the bling the loose core sample within the drill string. This
existing space between the inside wall and the surface device can be attached to the inside of the hollow
of the core (0.025 in.). This difference (0.005 in.) 
cutting bit and is relatively inexpensive to fabricate, 	
makes it possible to eliminate the chance that the core 
- How it's done:	 retainer will grasp the core, create additional fric-
- The innovation illustrated in the figure can provide	 tional loads, and consume unnecessary energy. 
a means for maintaining a complete core sample within 	 When the drill has reached the proper depth in a 
a drill string. This assembly, which resembles an	 sampling operation, the operator proceeds to extract 
iris-light-restraint mechanism found in most cameras, 	 the drill string from, the subsurface of the earth. At 
is stamped from 0.010-in, spring steel with the in-	 this instant, the leaves, which are pressed against 
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=19690000477 2020-03-16T18:02:46+00:00Z
the inner wall of the drill string, start to insert 
themselves into the core and continue to close as the 
downward pressure of the core increases, bringing 
about a complete closure. 
Notes: 
1. This innovation could be of interest to the mining 
industry, particularly that segment involved in ex-
ploration activities. It would also be of interest to 
geologists engaged in research and development. 
2. No further documentation is available. Inquiries 
may be directed to: 
Technology Utilization Officer 
Manned Spacecraft Center 
Houston, Texas 77058 
Reference: B69-10496
Patent status: 
No patent action is contemplated by NASA. 
Source: Humbert Olivari of 
Martin-Marietta Corporation 
under contract to 
Manned Spacecraft Center 
(MSC-I 1402)
. 
S 
Brief 69-10496	 Category 05


Iris-leaf core retainer for a surface drill

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