Patent ID: 6820701
Filing Date: 2004-11-23
Classification: E21B

Abstract:
A visual probe for viewing subsurface areas, comprising:an entry segment having a tip end configured for insertion into a ground, an attachment end, and a push rod receiving point; an extension segment having first and second ends which are open, the first end configured to be selectively coupled to the attachment end of the entry segment at an entry segment joint to form an insertion chain, and a cylindrical sidewall at least a portion of which is transparent which extends between the first and second ends, the cylindrical sidewall and the first and second ends together defining in part a central cavity; an entry segment push rod having a leading end, a push rod connection tube, and a trailing end, the leading end being configured to be selectively coupled to the push rod receiving point of the entry segment; a pressure cap having a selectively operable valve, the pressure cap being configured to selectively couple with the second end of the extension segment, and the pressure cap selectively substantially sealing the central cavity before the extension segment and attached entry segment are driven into the ground.