Abstract

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.

IPC Classes  ?

• H03K 17/955 - Proximity switches using a capacitive detector
• B27G 19/00 - Safety guards or devices specially adapted for wood sawsAuxiliary devices facilitating proper operation of wood saws
• B26B 11/00 - Hand knives combined with other implements, e.g. with corkscrew, with scissors, with writing implement

Abstract

An active protection system and method in a portable cutting tool with movable cutting members is disclosed, comprising at least - stopping means of said cutting members, - a control and processing unit apt to trigger said stopping means upon the detection of a danger condition, - a proximal electrode electrically coupled with a handle of said tool and a distal electrode electrically coupled with said cutting member, apt to make up an armature of a capacitor, said processing unit feeding an electric output signal into one of said electrodes and detecting an electric input signal on the other electrode, wherein said electric output signal comprises at least two different frequencies, a detection unit is also provided which detects a complex impedance of said electric input signal at said different frequencies, and said processing unit determines a danger condition and causes triggering of said stopping means based on a value of the magnitude of said complex impedance electric signal and on a phase difference of said impedance electric signal at said different frequencies.

IPC Classes  ?

• B27B 17/00 - Chain sawsEquipment therefor
• B27G 19/00 - Safety guards or devices specially adapted for wood sawsAuxiliary devices facilitating proper operation of wood saws
• H02H 5/00 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
• H03K 17/945 - Proximity switches

Abstract

An active protection system and method in a portable cutting tool with movable cutting members is disclosed, comprising at least - stopping means of said cutting members, - a control and processing unit apt to trigger said stopping means upon the detection of a danger condition, - a proximal electrode electrically coupled with a handle of said tool and a distal electrode electrically coupled with said cutting member, apt to make up an armature of a capacitor, said processing unit feeding an electric output signal into one of said electrodes and detecting an electric input signal on the other electrode, wherein said electric output signal comprises at least two different frequencies, a detection unit is also provided which detects a complex impedance of said electric input signal at said different frequencies, and said processing unit determines a danger condition and causes triggering of said stopping means based on a value of the magnitude of said complex impedance electric signal and on a phase difference of said impedance electric signal at said different frequencies.

IPC Classes  ?

• B27G 19/00 - Safety guards or devices specially adapted for wood sawsAuxiliary devices facilitating proper operation of wood saws

Abstract

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.

IPC Classes  ?

• F16P 3/14 - Safety devices acting in conjunction with the control or operation of a machineControl arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine the means being photocells or other devices sensitive without mechanical contact
• B27G 19/00 - Safety guards or devices specially adapted for wood sawsAuxiliary devices facilitating proper operation of wood saws

Abstract

A safety kit is disclosed for cutting equipment such as electric or engine-operated chain saws. The kit comprises a least a pair of electrodes connected to an integrated-circuit assessment and driving unit, the unit being configured for acquiring a reference capacity value at least upon switching on said equipment and for issuing a safety signal when the capacity value measured between said two electrodes varies by a preset threshold with respect to said reference capacity value, the safety signal being sent to a de-activation actuator for the switching off of the equipment. The kit comprises a first proximal electrode (10a, 100a) which comprises a capacity sensor and consists of a conductive electrode bar applicable in a removable manner to a handle (1) of said equipment, a second distal electrode (10b, 100b) consisting of a conductive plate which may be fastened to a retaining bolt of a support blade (7, 107) of the cutting chain of the equipment, and the integrated-circuit assessment and driving unit which is arranged between said proximal electrode (10a, 100a) and a case (10, 100), and is provided with conductive connection cables (12, 14) to the electrodes and to said switching-off actuator, and said switching-off actuator is in the shape of a relay suited to close/open an electric supply circuit (3, P) of said equipment.

IPC Classes  ?

• F16P 3/14 - Safety devices acting in conjunction with the control or operation of a machineControl arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine the means being photocells or other devices sensitive without mechanical contact
• B27G 19/00 - Safety guards or devices specially adapted for wood sawsAuxiliary devices facilitating proper operation of wood saws
• B27B 17/08 - Drives or gearingsDevices for swivelling or tilting the chain saw
• B27B 17/00 - Chain sawsEquipment therefor
• A41D 13/00 - Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches

Abstract

Safety system in a portable tool (1) comprising a pair of electrodes connected to a measurement and assessment unit, said 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, said measurement and assessment unit configured for acquiring a reference capacity value measured between said two electrodes varies by a preset difference threshold with respect to said reference value, the safety signal being sent to a tool deactivation actuator.

IPC Classes  ?

• F16P 3/14 - Safety devices acting in conjunction with the control or operation of a machineControl arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine the means being photocells or other devices sensitive without mechanical contact
• B27G 19/00 - Safety guards or devices specially adapted for wood sawsAuxiliary devices facilitating proper operation of wood saws

Abstract

A braking arrangement in a chainsaw or similar portable cutting tool is disclosed, comprising a braking device with a drum(5) and strap (6), acting on a cutting device (3)of said portable cutting tool, kept under load by first elastic means (10) the action of which is opposed by disengageable ratchet- gear means (7, 11, 11b, 11c, 12), said ratchet-gear means being disengageable by contact with a snap ratchet (13) arranged in close proximity thereto and integral in rotation with at least one safety lever (8) mounted pivoted(9) on the body (1) of a portable tool in the proximity of a grip (P) for the operator; said snap ratchet (13) is mounted pivoting(13a) on said safety lever (8) and is pushed towards said ratchet-gear means (11c) by second elastic means(14) in opposition to opposition means (15a) controlled by an electromechanical actuator (15), said electromechanical actuator being driven in the sense of displacing said opposition means (15a) to release the rotation of said ratchet (13), under the thrust of said second elastic means(14), at least upon the detection of a minimum distance between an operator and said cutting device (3) by a safety system apt to detect said minimum distance.

IPC Classes  ?

• B27B 17/08 - Drives or gearingsDevices for swivelling or tilting the chain saw

Abstract

A device for protection from accidents comprises a protective support (2) to be interposed between an operator and a tool (3) to be used by said operator; the protection device further comprises cutoff/switching off means adapted to be active on the tool (3) at a minimum distance between the protective support (2) and the tool (3).

IPC Classes  ?

• H02H 11/00 - Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result