An arrangement to capture passively a broken saw chain of a chain saw with a guide bar that is arranged such that it can pivot, including a stationary screen that forms part of a sawing box and that covers a rear part of the saw. In order to achieve an inexpensive and efficient protection there is arranged between an end surface of the screen and the guide bar an energy-absorbing brake member that is sufficiently elastic or flexible to receive the kinetic energy from a broken saw chain, to direct kinetic energy away from the chain and to regain its normal form after it has suffered an impact from and been deformed by the chain.

A reciprocating saw includes a housing, a motor positioned within the housing and configured to drive a reciprocating saw blade, and a shoe coupled to the housing. The shoe is configured to engage a workpiece. The reciprocating saw also includes a proximity sensor configured to detect the workpiece when engaged with the shoe. The proximity sensor is positioned on a forward end of the housing in a facing relation with the workpiece. In response to the proximity sensor detecting formation of a gap between the shoe and the workpiece, the proximity sensor is operable to deactivate the motor.

Throat plates for table saws and table saws including the same are disclosed. In some embodiments, the throat plates and/or saws include at least one securement mechanism adapted to secure and prevent inadvertent removal of the throat plate from the throat of the saw. In some embodiments, at least one of the securement mechanisms also provides a height adjustment mechanism and/or prevents vertical removal of the throat plate. In some embodiments, the throat plate includes an accessory mounting port that provides a portal for accessories, including safety accessories, to extend through the plate from beneath the table of the saw. In some embodiments, the port extends from the plate's outer perimeter to divide the plate's rear end portion into a pair of spaced-apart members. In some embodiments, these members are independently secured to the table saw and retained apart from each other by one or more of the securement mechanisms.

Woodworking machines and safety methods for use with those machines are disclosed. The machines include a detection system adapted to detect one or more dangerous conditions and a reaction system associated with the detection system. The reaction system can include an explosive to trigger the system, and also can be configured to retract a cutting tool at least partially away from a cutting region upon detection of a dangerous condition by the detection system.

A safety system in a portable tool (1) includes a pair of electrodes connected to a measurement and assessment unit, the measurement and assessment unit being an integrated circuit touch sensor device provided with a ground connector and with a sense electrode, wherein the ground connector is configured as internal floating ground connected to one electrode, the measurement and assessment unit configured for acquiring a reference capacity value measured between the two electrodes varies by a preset difference threshold with respect to the reference value, the safety signal being sent to a tool deactivation actuator.

A chain bar unit for a wall saw is presented herein. The chain bar unit can include a bar configured to receive a circulating chain or wire around a perimeter of the bar. The chain bar unit also can include a driving gear for driving the chain or wire around the bar, the driving gear configured to be coupled to an output shaft of the wall saw. The chain bar unit further includes the bar being tapered from an end proximate to the driving gear to a distal end having a distal end radius, wherein a width of the bar at the proximate end, is at least two times the distal end radius of the distal end.

An active protection system and method in a portable cutting tool with movable cutting members includes at least: a cutting member stop; a controller/processor triggering the stop upon the detection of a danger condition; a proximal electrode electrically coupled with a tool handle and a distal electrode electrically coupled with the cutting member, to make up an armature of a capacitor, the processing unit feeding an electric output signal into one of the electrodes and detecting an electric input signal on the other electrode. The electric output signal includes different frequencies. A detection unit detecting a complex impedance of the electric input signal at the different frequencies. The processing unit determines a danger condition and causes triggering of the stop based on a value of the magnitude of the complex impedance electric signal and on a phase difference of the impedance electric signal at the different frequencies.

A circular saw includes a support surface for a workpiece and which has a saw blade slot, a main drive motor arranged below the support surface for driving a saw blade in rotational movement, and a saw blade holder connected to the main drive motor for the purpose of transmitting the rotational movement A height-adjustment apparatus, with a height actuator and a transmission element coupled to the saw blade holder are arranged to set the spacing between a saw blade holder and the support surface An electronic interface provides the input of a saw blade projection. A protection apparatus is connected by signals to a monitoring apparatus and the height actuator and is adapted to activate the height actuator for quick lowering of the saw blade holder when a dangerous situation is recorded by the monitoring apparatus.

A cutter machine may include a cutter unit, a prime mover configured to drive the cutter unit, a housing including a housing body and a grip, wherein the housing body holds the cutter unit and houses the prime mover, and the grip extends from the housing body and is configured to be grasped by a user's hand, and a hand guard attached to the housing, configured to protect fingers of the user's hand grasping the grip, and being more deformable than the housing.

A method and system automatically determine cleaning, maintenance and/or repair information for a motor-driven treatment tool, wherein the treatment tool comprises a residue, able to be detected externally optically, caused during the operation of the treatment tool. The method involves the steps of: optically detecting the residue; classing the detected residue in accordance with a type of the residue; determining the cleaning, maintenance and/or repair information based on the classing; and outputting the determined cleaning, maintenance and/or repair information.