Peg securing method and apparatus

Abstract

Hollow tubular pegs having bases and stems, and pegs without bases having only stems, with distensible portions on their stems which are caused to bulge to assist in anchoring the pegs into a medium in which they are inserted and method and means for forming the bulges by distending portions of the stems after insertion into a medium; and means to anchor pegs carrying data instruments into a position within a medium by causing distensible portions of pegs to bulge within the medium.

We claim:  
     
         1 . A method of utilization of a peg in a medium comprising: inserting a peg consisting of a hollow tubular member having a first and a second end, a non-distensible segment adjacent each end, and a distensible segment intermediate said non-distensible segments into a medium; and filling said hollow tubular member with a substance under pressure thereby causing the distensible segment to expand and cause a bulge which displaces a portion of the medium.  
     
     
         2 . The method of  claim 1  wherein the substance under pressure is a fluid which turns to a solid after the distensible portion has been expanded to a predetermined size.  
     
     
         3 . A method for mounting an object within a medium comprising: inserting a hollow peg having a distensible portion into the medium; distending the distensible portion so as to secure the peg in a position within the medium; connecting a fastener to the hollow peg; and fastening the object to the fastener.  
     
     
         4 . A method for testing unstable mediums comprising: inserting an instrument into the distensible portion of an elongate peg having a first non-distensible segment, a second distensible segment, and a third non-distensible segment; inserting a hollow, elastic member into the peg; causing the distensible segment to expand and secure the peg within a given position in the medium by pressurizing the elastic member; and causing the instrument to be operated to gather information.