Patent ID: 7467700
Filing Date: 2008-12-23
Classification: B25B,B25F,F16D

Abstract:
1. A power tool comprising: a motor-driven drive shaft; an output shaft for driving a tool receptacle; a clutch arranged between said drive shaft and said output shaft, said clutch having an engaged position in which torque is transmitted from said drive shaft to said output shaft, and having a released position wherein torque transmission from said drive shaft to said output shaft is interrupted; wherein said clutch comprises wherein said first clutch element is connected to said output shaft for common rotation therewith, wherein said second clutch element is connected to said drive shaft for common rotation therewith, and wherein said nanotube actuator is configured for axially moving one of said first and second clutch elements from said engaged position into said released position against the action of a restoring force; and wherein said nanotube actuator, together with an electrolyte, are sealingly received in a housing, said housing comprising an opening sealed by a diaphragm, said diaphragm engaging at least one piston for translating a volume expansion of said electrolyte into an axial movement of said least one piston, said nanotube actuator including at least one layer with nanotubes epitaxially grown between mutually parallel plates.