公开(公告)号：US11123854B2

公开(公告)日：2021-09-21

申请号：US16517317

申请日：2019-07-19

Applicant: Hilti Aktiengesellschaft

Inventor： Erwin Manschitz ,  Walter Wissmach

IPC: B25F5/00 ,  B25D16/00 ,  B25D11/12

Abstract: A handheld power tool has a tool socket (2) to hold a tool (4) along a working axis (11), a motor (5) and a slip clutch (21) having a number of blocking elements. A sensor (27) serves to record a measured signal (28) as the measure of vibrations inside the handheld power tool (1). A band-pass filter (29) has a pass range in which a frequency lies that is equal to the product of the rotational speed of the wheel (22) on the drive side and the number N of blocking elements (24). The measured signal (28) filtered by the band-pass filter (29) is fed to an evaluation unit (30). When the filtered measured signal (28) exceeds a limit value, the evaluation unit (30) reduces the rotational speed of the motor (5).

公开(公告)号：US10751866B2

公开(公告)日：2020-08-25

申请号：US15321982

申请日：2015-06-25

Applicant: Hilti Aktiengesellschaft

Inventor： Erwin Manschitz ,  Walter Wissmach

IPC: B25F5/00 ,  B25D16/00 ,  B25D11/12

Abstract: A handheld power tool has a tool socket (2) to hold a tool (4) along a working axis (11), a motor (5) and a slip clutch (21) having a number of blocking elements. A sensor (27) serves to record a measured signal (28) as the measure of vibrations inside the handheld power tool (1). A band-pass filter (29) has a pass range in which a frequency lies that is equal to the product of the rotational speed of the wheel (22) on the drive side and the number N of blocking elements (24). The measured signal (28) filtered by the band-pass filter (29) is fed to an evaluation unit (30). When the filtered measured signal (28) exceeds a limit value, the evaluation unit (30) reduces the rotational speed of the motor (5).

公开(公告)号：US20170129089A1

公开(公告)日：2017-05-11

申请号：US15321982

申请日：2015-06-25

Applicant: Hilti Aktiengesellschaft

Inventor： Erwin Manschitz ,  Walter Wissmach

IPC: B25D16/00 ,  B25D11/12 ,  B25F5/00

Abstract: A handheld power tool has a tool socket (2) to hold a tool (4) along a working axis (11), a motor (5) and a slip clutch (21) having a number of blocking elements. A sensor (27) serves to record a measured signal (28) as the measure of vibrations inside the handheld power tool (1). A band-pass filter (29) has a pass range in which a frequency lies that is equal to the product of the rotational speed of the wheel (22) on the drive side and the number N of blocking elements (24). The measured signal (28) filtered by the band-pass filter (29) is fed to an evaluation unit (30). When the filtered measured signal (28) exceeds a limit value, the evaluation unit (30) reduces the rotational speed of the motor (5).

公开(公告)号：US20190337137A1

公开(公告)日：2019-11-07

申请号：US16517317

申请日：2019-07-19

Applicant: Hilti Aktiengesellschaft

Inventor： Erwin Manschitz ,  Walter Wissmach

IPC: B25D16/00 ,  B25D11/12 ,  B25F5/00

Abstract: A handheld power tool has a tool socket (2) to hold a tool (4) along a working axis (11), a motor (5) and a slip clutch (21) having a number of blocking elements. A sensor (27) serves to record a measured signal (28) as the measure of vibrations inside the handheld power tool (1). A band-pass filter (29) has a pass range in which a frequency lies that is equal to the product of the rotational speed of the wheel (22) on the drive side and the number N of blocking elements (24). The measured signal (28) filtered by the band-pass filter (29) is fed to an evaluation unit (30). When the filtered measured signal (28) exceeds a limit value, the evaluation unit (30) reduces the rotational speed of the motor (5).