US 12,083,664 B2
Method for detecting a slip clutch release event, and power tool
Christian Sattler, Biessenhofen (DE); Marco Balter, Feldkirch (AT); and Frank Fritsch, Kaufering (DE)
Assigned to Hilti Aktiengesellschaft, Schaan (LI)
Appl. No. 17/621,920
Filed by Hilti Aktiengesellschaft, Schaan (LI)
PCT Filed Jun. 17, 2020, PCT No. PCT/EP2020/066781
§ 371(c)(1), (2) Date Dec. 22, 2021,
PCT Pub. No. WO2020/260093, PCT Pub. Date Dec. 30, 2020.
Claims priority of application No. 19182950 (EP), filed on Jun. 27, 2019.
Prior Publication US 2022/0274244 A1, Sep. 1, 2022
Int. Cl. B25F 5/00 (2006.01); B23B 49/00 (2006.01); B23Q 17/09 (2006.01); B23Q 17/10 (2006.01); G01M 13/022 (2019.01)
CPC B25F 5/001 (2013.01) [B23B 49/00 (2013.01); B23Q 17/0961 (2013.01); B23Q 17/10 (2013.01); G01M 13/022 (2013.01); B23B 2226/75 (2013.01); B23B 2260/07 (2013.01); B23B 2260/128 (2013.01); B23B 2270/486 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A method for detecting whether a slip clutch release event has taken place in a power tool (1), the power tool (1) comprising:
a motor (3) as a drive for the power tool (1);
a control device (4);
a gear device (5);
a first sensor (10) for sensing a first speed of the gear device (5);
a second sensor (20) for sensing a second speed of the motor (3);
a third sensor (30) for sensing a current value; and
a slip clutch (12);
and comprising the steps of:
a) determining the first speed of the gear device (5) by the first sensor (10);
b) determining the second speed of the motor (3) by the second sensor (20);
c) determining the current value by the third sensor (30);
d) determining a state of the power tool (1) by using the first and second speeds and the current value;
e) determining a state of the gear device (5) in dependence on the current value by the control device;
f) ascertaining a state of activity of the slip clutch (12) in dependence on the first and second speeds by the control device; and
g) ascertaining by the control device by a combination of the state of the gear device (5) and the state of activity of the slip clutch (12) whether the slip clutch release event has taken place.