PROTECTOR FOR PORTABLE TOOLS WITH HEAT ENGINE TO SHUT THEM OFF AT ABRUPT SHIFTS Russian patent published in 2014 - IPC B27B17/00 G08B21/02 

FIELD: process engineering.

SUBSTANCE: invention relates to portable tool protector, particularly, to protector of chain saw with heat engine. Proposed protector comprises at least one electronic accelerometer to measure acceleration in at least one plane or in one axis. Accelerometer outputs are connected with electric and/or electronic control means that makes an electric and/or electronic control circuit. The latter and accelerometer are supplied from known electric current generator driven by heat engine. Electric or electronic control circuit allows processing of analogue or digital electric data from accelerometer and driving the means for, in fact, immediate shutdown of said heat engine. Means to drive the electronic ignition unit represents a system to actuate programmable heat engine ignition advance for engine shutdown. This causes the torque inverse to normal working torque acting as a high-power brake initiating immediate engine shutdown by electronic circuit to drive the electronic unit or being connected in said electronic ignition unit.

EFFECT: decreased weight of device.

5 cl, 6 dwg