The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 20, 1981
Filed:
Mar. 13, 1980
Paul Schmidt, 5940 Lennestadt/Saalhausen, DE;
Other;
Abstract
A self-driven pneumatically operated ram borer for boring holes in the ground includes a casing containing a percussion piston and a control sleeve for controlling the supply of compressed air through a hose to cause the piston to reciprocate, is provided with a control tube which is rotatable to vary the porting of the borer to cause it to move either forwards or rearwards. The tube is rotated into either a forward position or a reverse position by means of a flexible shaft which extends from the casing within the hose. By enclosing the shaft within the hose, the shaft is protected and is not subject to friction against the wall of the hole bored by the borer or to jamming if the hole collapses. The borer can thus easily be controlled even when it has passed through a very long bore hole.