| US 7,331,496 B2 | ||
| Hammer drill | ||
| Rory Britz, Kaufering (Germany); and Rainer Ontl, Landsberg am Lech (Germany) | ||
| Assigned to Hilti Aktiengesellschaft, Schaan (Liechtenstein) | ||
| Filed on Apr. 15, 2005, as Appl. No. 11/105,567. | ||
| Claims priority of application No. 10 2004 018 084 (DE), filed on Apr. 08, 2004. | ||
| Prior Publication US 2005/0224242 A1, Oct. 13, 2005 | ||
| Int. Cl. E02D 7/02 (2006.01) | ||
| U.S. Cl. 227—48 [227/29; 227/217; 74/22 R; 74/22 A] | 13 Claims |
| 1. A hammer drill (2) for carrying out a pure drilling operation, a pure percussion operation, and a rotary-percussion operation, comprising:
a clockwise and counterclockwise driven tool spindle (28);
a drive pinion (70) operationally connectable with the tool spindle (28) for transmitting a torque thereto;
a separate control handle (6) rotatable to different positions for selecting one of the pure drilling operation, the pure percussion operation, and the
rotary-percussion operation;
a switching device (8) adjustable in accordance with a position of the control handle (6) and shiftable by the control handle (6) in a clockwise rotation position for effecting a pure drilling operational in a clockwise direction and in a counterclockwise
rotation position for effecting a pure drilling operation in a counterclockwise direction; and
an eccentric member (30) for driving a percussion mechanism or the hammer drill (2), and a drive member (34) for driving the eccentric member (30), wherein the switching device (8) comprises coupling means (24) arranged between the eccentric member (30) and the drive member (34).
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