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:
Aug. 17, 1999
Filed:
Dec. 06, 1996
Alfons Hesse, Lennestadt, DE;
Tracto-Technik Paul Schmidt Spezialmaschinen, Lennestadt, DE;
Abstract
A ram-boring machine with forward and reverse motion control which comprises a percussion piston that can be axially displaced in a tubular housing, a control tube that is arranged in the housing and controls the forward and reverse motion of the percussion piston by passing over radial control openings in the percussion piston, control edges on the control tube which are guided in the percussion piston in sealed fashion, a compressed air bore that runs into the front end of the control tube, a compressed air bore or compressed air line that runs into an annular chamber between a first control edge and a second control edge, an outlet bore or outlet line that originates in the region between the second control edge and a third control edge and leads to the rear end of the control tube, and control means for selectively charging the compressed air bore or compressed air line or ventilating the outlet bore or outlet line.