A system includes a first brake actuator for controlling pressure applied to a first brake, a BCU configured to receive a first plurality of inputs and to output a first BCU control signal for controlling the first brake actuator based on the first plurality of inputs, and a first switch coupled between the first brake actuator and the BCU. The system also includes a backup controller designed to receive a second plurality of inputs, determine a first backup control signal for controlling the first brake actuator based on the second plurality of inputs, determine that the BCU is functioning improperly based on the second plurality of inputs, and control the first switch to prevent the first BCU control signal from controlling the first brake actuator and to output the first backup control signal to the first brake actuator in response to determining that the BCU is functioning improperly.

A power tool includes a direct current (DC) unit, a motor, a driving circuit, a capacitor circuit, and a control unit. The capacitor circuit includes a switching element and a capacitor. The control unit drives the switching element to realize the control of charging or discharging of the capacitor. The capacitor circuit is connected between the DC unit and the driving circuit, and can buffer the impact on the power supply side of the power tool, making the power tool compact in structure.

A handheld work apparatus has a tool and a brake assembly for the tool. The brake assembly has an actuating element which acts on a brake element of the brake assembly. The actuating element is movable between a fixed position wherein the tool is not braked, and a released position, wherein the brake element brakes the tool. To fix the actuating element in the fixed position, an electromagnet is provided. The electromagnet interacts with an anchor on the actuating element. The anchor is mounted via a pivot joint on an anchor pin to be pivotable about a pivot axis. A guide includes a guide part connected to the anchor and a guide part connected to the yoke, wherein, in the fixed position of the actuating element, the guide parts guide the anchor relative to the yoke in a transverse direction of an outrigger of the apparatus.

A handheld work apparatus has a tool and a brake assembly for the tool. The brake assembly has an actuating element which acts on a brake element of the brake assembly. The actuating element is movable between a fixed position wherein the tool is not braked, and a released position, wherein the brake element brakes the tool. To fix the actuating element in the fixed position, an electromagnet is provided. The electromagnet interacts with an anchor on the actuating element. The anchor is mounted via a pivot joint on an anchor pin to be pivotable about a pivot axis. A guide includes a guide part connected to the anchor and a guide part connected to the yoke, wherein, in the fixed position of the actuating element, the guide parts guide the anchor relative to the yoke in a transverse direction of an outrigger of the apparatus.

A rotational control structure of a pneumatic tool includes a housing provided with a cylinder unit. The cylinder unit has a bottom wall with two through holes and a guide post extending outwardly. The guide post has a gas passage and a gas outlet. The guide post is closely connected with a rotatable control ring leaning against the bottom wall. A sealing ring is provided between the bottom wall and the guide post. The control ring has a control passage therein. The control ring is rotatable for the control passage to communicate with one of the through holes of the bottom wall, thereby controlling the forward/reverse rotation of the pneumatic tool.

A rotational control structure of a pneumatic tool includes a housing provided with a cylinder unit. The cylinder unit has a bottom wall with two through holes and a guide post extending outwardly. The guide post has a gas passage and a gas outlet. The guide post is closely connected with a rotatable control ring leaning against the bottom wall. A sealing ring is provided between the bottom wall and the guide post. The control ring has a control passage therein. The control ring is rotatable for the control passage to communicate with one of the through holes of the bottom wall, thereby controlling the forward/reverse rotation of the pneumatic tool.

A suction hood for a power tool, which includes a rotating tool, in particular a grinding or cutting tool, for collecting and removing dust generated during the use of the power tool, a first side wall having a first recess, a second side wall having a second recess, and a suction channel connected to the first and second side walls. The diameter of the first recess is greater than the diameter of a flange of the power tool, so that the first recess is positionable around the flange. The diameter of the second recess is greater than the diameter of a clamping element, which is used to detachably fasten the tool on a spindle of the power tool, so that the clamping element may be accommodated in the second recess. The first and second side walls are positioned at a distance from each other which is shorter than the length of the spindle.

A suction hood for a power tool, which includes a rotating tool, in particular a grinding or cutting tool, for collecting and removing dust generated during the use of the power tool, a first side wall having a first recess, a second side wall having a second recess, and a suction channel connected to the first and second side walls. The diameter of the first recess is greater than the diameter of a flange of the power tool, so that the first recess is positionable around the flange. The diameter of the second recess is greater than the diameter of a clamping element, which is used to detachably fasten the tool on a spindle of the power tool, so that the clamping element may be accommodated in the second recess. The first and second side walls are positioned at a distance from each other which is shorter than the length of the spindle.

An oscillatory driving device for a hand-held power tool includes at least one input shaft, at least one output shaft, and at least one gearing unit. The gearing unit operatively connects the input shaft to the output shaft and includes at least one eccentric element configured to drive the output shaft in an oscillatory manner. The gearing unit includes at least one further eccentric element configured to drive the output shaft in an oscillatory manner.

An oscillatory driving device for a hand-held power tool includes at least one input shaft, at least one output shaft, and at least one gearing unit. The gearing unit operatively connects the input shaft to the output shaft and includes at least one eccentric element configured to drive the output shaft in an oscillatory manner. The gearing unit includes at least one further eccentric element configured to drive the output shaft in an oscillatory manner.