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:
May. 29, 2001
Filed:
Feb. 09, 2000
Reinhard Plietsch, Brechen, DE;
Robert Bernhard Wache, Wiesbaden, DE;
Bruno Meinholf Ruethers, Bad Camberg, DE;
Black & Decker Inc., Newark, DE (US);
Abstract
A rotary hammer is provided which comprises a tool holder (,) and an air cushion hammering mechanism which comprises a cylinder (,′) having one end (,) that is connected to the tool holder, a piston (,), a ram (,) and a beat piece (,) slidably located in the cylinder so that reciprocation of the piston in the cylinder will cause the ram to reciprocate in the cylinder and thus cause the beat piece to hit a bit located in the tool holder. The ram (,) has an annular recess (,) in its peripheral surface at the end thereof nearest the piston (,), in which recess is located an annular seal (,). The annular seal has an annular seating flap (,) lying on the radially outwardly directed surface of the recess and an annular sealing flap (,) that is joined to the seating flap and extends between the radially outwardly directed surface of the recess and the inner wall of the cylinder (,′).