US 9,808,919 B2
Handheld screwing apparatus
Dietmar Saur, Gomaringen (DE)
Assigned to Robert Bosch GmbH, Stuttgart (DE)
Filed by Robert Bosch GmbH, Stuttgart (DE)
Filed on Jun. 4, 2013, as Appl. No. 13/909,217.
Claims priority of application No. 10 2012 209 447 (DE), filed on Jun. 5, 2012.
Prior Publication US 2013/0331229 A1, Dec. 12, 2013
Int. Cl. B25B 23/147 (2006.01); B25B 23/14 (2006.01)
CPC B25B 23/147 (2013.01) [B25B 23/141 (2013.01); Y10T 477/32 (2015.01)] 6 Claims
OG exemplary drawing
 
1. A handheld screwing apparatus, comprising:
a torque clutch configured to restrict a torque that is maximally able to be transmitted to an inserted tool, wherein the torque clutch has at least one manually adjustable operating element configured to adjust the torque that is maximally able to be transmitted to the inserted tool;
at least one monitoring unit configured to ascertain a characteristic rotational offset quantity which represents a number of times in a working cycle that the torque clutch has become disengaged due to overturning;
a drive unit; and
a control unit configured to control the drive unit as a function of the characteristic rotational offset quantity of the monitoring unit and a characteristic operator quantity which represents a maximum value of the characteristic rotational offset quantity and depends on an operator input via an operating arrangement;
wherein the at least one monitoring unit includes a sensor which detects at least one item of information of the characteristic rotational offset quantity at the torque clutch,
wherein the control unit stops the drive unit or reduces a motor speed of the drive unit when the characteristic rotational offset quantity reaches the characteristic operator quantity,
wherein the control unit reduces the motor speed of the drive unit when the characteristic rotational offset quantity reaches a first predefined value and stops the drive unit when the characteristic rotational offset quantity reaches a second predefined value, the second predefined value being different from the first predefined value.