US 11,701,758 B2
Portable power tool
Michael Mueck, Wangen (DE); and Frank Walz, Heubach (DE)
Assigned to C. & E. Fein GmbH, Schwaebisch Gmuend-Bargau (DE)
Filed by C. & E. Fein GmbH, Schwaebisch Gmuend-Bargau (DE)
Filed on Nov. 23, 2020, as Appl. No. 17/101,776.
Claims priority of application No. 20 2019 106 525.7 (DE), filed on Nov. 22, 2019.
Prior Publication US 2021/0154807 A1, May 27, 2021
Int. Cl. B25B 21/00 (2006.01); B25F 5/00 (2006.01); B25B 23/14 (2006.01); B25B 23/147 (2006.01)
CPC B25B 21/00 (2013.01) [B25B 23/141 (2013.01); B25B 23/147 (2013.01); B25F 5/001 (2013.01)] 15 Claims
OG exemplary drawing
 
1. An electric portable power tool comprising:
a housing;
a drive shaft;
a control cam;
an electric drive accommodated in the housing to drive the drive shaft; and
an output unit that is positively connected with the electric drive via a mechanical shut-off clutch to transfer torque from the electric drive to an insertion tool connected with the output unit,
wherein the mechanical shut-off clutch comprises a control ring that is axially mounted against the force of a return spring and at least one switch element that is run on the control cam,
wherein the control cam is delimited at one end by a first switching contour for providing a release torque of the mechanical shut-off clutch and by a boundary contour at another end,
wherein the control cam further includes a second switching contour for providing a pre-torque which is less than the release torque,
wherein the first switching contour and the second switching contour are provided on a same inclined ramp of the control cam leading to a peak, and
wherein, on the inclined ramp, the first switching contour is provided by a curved incline and the second switching contour is provided by a straight incline.