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:
Jun. 03, 2014
Filed:
May. 25, 2010
Markus Hartmann, Mauerstetten, DE;
Alexander John, Ob Hohenburg, AT;
Markus Hartmann, Mauerstetten, DE;
Alexander John, Ob Hohenburg, AT;
Hilti Aktiengesellschaft, Schaan, LI;
Abstract
The machine tool includes a pneumatic percussion mechanism having a cup-shaped exciter cylinder () with an inner chamber () which is open in the direction of impact (), and a free piston () which is movable in the inner chamber (). A recess () and at least one ventilation opening (), spaced at a distance from the recess () in the direction of impact (), are provided in a shell-type wall () of the inner chamber (). The free piston () includes a sealing element () which seals off the at least one ventilation opening () when the sealing element () is oppositely situated from the at least one ventilation opening (), and which in the region of the recess () is separated at a distance from the shell-type wall () when the sealing element () is oppositely situated from the recess.