Patent · US Active

Handheld work apparatus having a drive circuit for an electric motor which drives oscillating tools

US9742315B2 · kind B2 · utility

0Cited by

4References

14Claims

0Family size

Assignee

Andreas Stihl AG & Co. KG · DE

Inventors

Jens Kloeker · Winnenden, DE
Jochen Luz · Waiblingen, DE

Key dates

Filing date	Sep 12, 2013
Grant date	Aug 22, 2017
Priority date	—
Expiry date	Oct 14, 2033

Classification

Technology area (CPC H)Electricity
CPC primaryH02P6/22
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

A handheld work apparatus having an electric motor and a drive circuit for the electric motor. The rotation movement of the motor is converted into an oscillating movement of the work tool via a gear mechanism. The motor is situated in a circuit including at least the motor and a switch for operating the motor. To reduce wear of the gear mechanism, a control unit for operating the motor in one of two directions of rotation is provided. The control unit independently determines a selected direction of rotation for a next operating cycle as a function of a control variable. When the motor is started, the motor is started by the control unit in the direction of rotation which is associated with a value of the control variable. The control variable changes before the motor is restarted for a following operating cycle.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.