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. 19, 2008
Filed:
Dec. 29, 2005
Klaus-dieter Arich, Huenstetten-Beuerbach, DE;
Erhard Benner, Hellenhahn, DE;
Manfred Droste, Limburg-Offheim, DE;
Uwe Nemetz, Hünfelden Nauheim, DE;
Martin Soika, Idstein, DE;
Michael Kunz, Dorndorf, DE;
Klaus-Dieter Arich, Huenstetten-Beuerbach, DE;
Erhard Benner, Hellenhahn, DE;
Manfred Droste, Limburg-Offheim, DE;
Uwe Nemetz, Hünfelden Nauheim, DE;
Martin Soika, Idstein, DE;
Michael Kunz, Dorndorf, DE;
Black & Decker Inc., Newark, DE (US);
Abstract
A transmission housing for a hammer drill comprises two clamshell halves and that mate to define a first transmission housing chamber and a second transmission housing chamber disposed on either side of a ball bearing race. The first and second transmission housing chambers are interconnected by channels. The rear end of a hollow piston, a cylindrical bearing, a crank pin and a crank plate are disposed in the first transmission housing chamber, and a spindle is disposed in the second transmission housing chamber. Overflow channels and allow movement of air between the first and second transmission housing chambers to reduce compression of air iduring reciprocation of the hollow piston.