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:
Jul. 06, 1999
Filed:
Jun. 26, 1997
Jens Ulbrich, Oberteuringen, DE;
Thomas Jeltsch, Markdorf, DE;
J. Wagner GmbH, Friedrichsagen, DE;
Abstract
A hand tool (1) having a drive motor (12), a depth stop (16) by which the drive motor (12) can be automatically switched off when it is in contact with a workpiece (4), and a switching mechanism (21) in an electric circuit (22). The electric circuit (22) includes a switch (24) for switching the drive motor (12) on and off, a first contact element (25) for reversing the polarity of the drive motor (12) and a second contact element (26) for switching off the drive motor (12) by the use of the depth stop (16). Also, a switching device (32) is connected to the drive motor (12) and is integrated into the electric circuit (22) so that the switching device (32) is arranged in a branch line (31) bypassing the second contact element (26) and by which the second contact element (26) can be bypassed in an open operating position caused by the depth stop (16) by actuation of the first contact element (25) for reversal of the direction of rotation of the drive motor (12), which makes it possible to switch the drive motor (12) from clockwise to counter-clockwise rotation or the reverse without the necessity of mechanical elements and without the necessity of any manual manipulation of adjustment elements.