US 6,981,474 B2
Setting tool
Markus Frommelt, Schaan (Liechtenstein); and Robert Jakob, Feldkirch (Austria)
Assigned to Hilti Aktiengesellschaft, Schaan (Liechtenstein)
Filed on Sep. 01, 2004, as Appl. No. 10/932,367.
Claims priority of application No. 103 41 385 (DE), filed on Sep. 05, 2003.
Prior Publication US 2005/0051594 A1, Mar. 10, 2005
Int. Cl. F02B 71/00 (2006.01)
U.S. Cl. 123—46R 5 Claims
OG exemplary drawing
 
1. A setting tool for driving in fastening elements, comprising:
a piston guide (13) having hollow chamber (14);
a setting piston (20) axially displaceably arranged in the hollow chamber (14) of the piston guide (13) and having a piston head (23), a piston stem (21), and a piston band (22) having a maximal outer diameter (DB); and a
piston stop device (30) for the setting piston (20) and arranged in a setting direction end region of the hollow chamber (14), the piston stop device (30) having a damping element (31) supported against a stop (15), and a stop member (32) adjoining the damping element (31) in a direction of the hollow chamber (14) and operationally connectable with the piston band (22), the stop member (32) having a cylindrical bushing (33) for the piston stem (21), the bushing (33) having an inner diameter (DS) that amounts to from 70% to 90% of a size of the maximal outer diameter (DB) of the piston band, the piston band (22) having a conical surface (24) engageable with inner surface of the bushing (33), wherein the piston band (22) has a hardness from 50 to 60 HRC, and the stop member (32) has a hardness in a range from 50% to 70% of the hardness of the piston band (22) with an upper limit of 38 HRC.