US 6,981,557 B2
Process for controlling an axially hammering and rotating electric hand-held machine tool
Hans Boeni, Buchs/SG (Switzerland); Roland Schaer, Grabs (Switzerland); Harald Schmitzer, Werdenberg (Switzerland); Ricardo Teixeira, Feldkirch (Switzerland); and Christoph Wuersch, Werdenberg (Switzerland)
Assigned to Hilti Aktiengesellschaft, Schaan (Liechtenstein)
Filed on Mar. 01, 2004, as Appl. No. 10/790,171.
Claims priority of application No. 103 09 012 (DE), filed on Mar. 01, 2003.
Prior Publication US 2004/0226728 A1, Nov. 18, 2004
Int. Cl. B25F 5/00 (2006.01)
U.S. Cl. 173—1 5 Claims
OG exemplary drawing
 
1. A control process for an at least partially axially hammering and rotating electric hand-held machine tool (1) wherein an electromagnetic clutch (4) arranged in the flow of force between an electric motor (2) and a tool receptacle (3) is controllably connected to computing means (5) connected to at least one sensor (6a, 6b, 6c), wherein the clutch (4) is repeatedly alternately opened and closed in at least one process step controlled by the computing means (5).