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:
Feb. 28, 2012
Filed:
Dec. 29, 2005
Martin Soika, Idstein, DE;
Klaus-dieter Arich, Huenstetten-Beuerbach, DE;
Martin Soika, Idstein, DE;
Klaus-Dieter Arich, Huenstetten-Beuerbach, DE;
Black & Decker Inc., Newark, DE (US);
Abstract
A hollow piston drive mechanism for a hammer drill comprises a crank pinhaving a cylindrical link memberrigidly connected to a part-spherical bearing. The part-spherical bearingis slidably and rotatably disposed in a part-spherical recessformed in the crank plate, as a result of which the bearingcan be easily mounted to the recess. The cylindrical link memberis slidably disposed in a cylindrical bearingformed in the end of the hollow piston. The crank pinis therefore able to rock back and forth in the spherical recessas well as slide up and down in the cylindrical bearing. A cylindrical collar memberis mounted on the cylindrical link memberof the crank pinand is moveable between a lower position in which it abuts the upper surface of the part-spherical bearingand an upper position in which it abuts and the underside of the cylindrical bearingso that the crank pinis prevented from moving out of engagement with the part-spherical recessformed in crank plate. The cylindrical collar membercan be mounted to the crank pinafter construction of the crank plateand crank pinassembly.