US 7,506,694 B2
Rotary tool
Michael Stirm, Oberursel (Germany); Norbert Hahn, Limbach (Germany); Martin Lauterwald, Huenstetten (Germany); Achim Jung, Hofheim-Marxheim (Germany); Stefan D. Gensmann, Frucht (Germany); Robert Alan Usselman, Forest Hill, Md. (US); and Robert Bradus, Bel Air, Md. (US)
Assigned to Black & Decker Inc., Newark, Del. (US)
Appl. No. 10/526,578
PCT Filed Sep. 10, 2003, PCT No. PCT/EP03/10029
§ 371(c)(1), (2), (4) Date Nov. 17, 2005,
PCT Pub. No. WO2004/024398, PCT Pub. Date Mar. 25, 2004.
Claims priority of application No. 0221225.6 (GB), filed on Sep. 13, 2002; and application No. 0227584.0 (GB), filed on Nov. 27, 2002.
Prior Publication US 2006/0124331 A1, Jun. 15, 2006
Int. Cl. B25F 5/00 (2006.01); B25D 16/00 (2006.01)
U.S. Cl. 173—178  [173/48; 173/176; 173/201; 192/56.61; 192/110 R] 5 Claims
OG exemplary drawing
 
1. A power tool comprising:
a motor;
a tool holder for holding an output member;
a transmission for transmitting rotary torque from the motor to the tool holder, the transmission comprising a first transmission portion and a second transmission portion and a clutch assembly located between the first transmission portion and the second transmission portion; the clutch assembly comprising:
a clutch shaft;
an output gear for driving the second transmission portion with rotary torque transmitted across the clutch assembly, the output gear rotationally fixed relative to the clutch shaft;
an input gear for receiving rotary torque from the first transmission portion, the input gear located around and rotatable relative to the clutch shaft;
a first slip disc and a first clutch mechanism operable for transmitting rotary torque not exceeding a first predetermined torque limit from the input gear to the clutch shaft;
a second slip disc and a second clutch mechanism operable for transmitting rotary torque not exceeding a second predetermined torque limit from the input gear to the clutch shaft, the second predetermined torque limit being greater than the first predetermined torque limit;
an actuator mechanism for selectively engaging the second slip disc for transmitting rotary torque, not exceeding the second predetermined torque limit, from the input gear to the clutch shaft.