Abrégé

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.

Classes IPC  ?

• H03K 17/955 - Commutateurs de proximité utilisant un détecteur capacitif
• B27G 19/00 - Protecteurs ou dispositifs de sécurité adaptés aux scies à boisDispositifs auxiliaires facilitant une bonne utilisation des scies à bois
• B26B 11/00 - Couteaux à main combinés avec d'autres instruments, p. ex. des tire-bouchons, des ciseaux, des instruments pour écrire

Abrégé

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.

Classes IPC  ?

• B27B 17/00 - Scies à chaîneAccessoires ad hoc
• B27G 19/00 - Protecteurs ou dispositifs de sécurité adaptés aux scies à boisDispositifs auxiliaires facilitant une bonne utilisation des scies à bois
• H02H 5/00 - Circuits de protection de sécurité pour déconnexion automatique due directement à un changement indésirable des conditions non électriques normales de travail avec ou sans reconnexion
• H03K 17/945 - Commutateurs de proximité

Abrégé

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.

Classes IPC  ?

• B27G 19/00 - Protecteurs ou dispositifs de sécurité adaptés aux scies à boisDispositifs auxiliaires facilitant une bonne utilisation des scies à bois

Abrégé

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.

Classes IPC  ?

• F16P 3/14 - Dispositifs de sécurité agissant en conjonction avec la commande ou le fonctionnement d'une machineCommandes exigeant l'emploi simultané de plusieurs parties du corps humain avec dispositifs, p. ex. des éléments sensibles, qui agissent sur la commande ou le fonctionnement de la machine lorsqu'une partie du corps humain se trouve dans ou près de la zone de danger les dispositifs étant des cellules photo-électriques ou d'autres dispositifs sensibles sans contact mécanique
• B27G 19/00 - Protecteurs ou dispositifs de sécurité adaptés aux scies à boisDispositifs auxiliaires facilitant une bonne utilisation des scies à bois

Abrégé

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.

Classes IPC  ?

• F16P 3/14 - Dispositifs de sécurité agissant en conjonction avec la commande ou le fonctionnement d'une machineCommandes exigeant l'emploi simultané de plusieurs parties du corps humain avec dispositifs, p. ex. des éléments sensibles, qui agissent sur la commande ou le fonctionnement de la machine lorsqu'une partie du corps humain se trouve dans ou près de la zone de danger les dispositifs étant des cellules photo-électriques ou d'autres dispositifs sensibles sans contact mécanique
• B27G 19/00 - Protecteurs ou dispositifs de sécurité adaptés aux scies à boisDispositifs auxiliaires facilitant une bonne utilisation des scies à bois
• B27B 17/08 - Entraînements ou commandesDispositifs pour faire pivoter ou incliner la chaîne
• B27B 17/00 - Scies à chaîneAccessoires ad hoc
• A41D 13/00 - Vêtements protecteurs de travail ou de sport, p. ex. blouses de chirurgien ou vêtements protégeant des coups ou des chocs

Abrégé

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.

Classes IPC  ?

• F16P 3/14 - Dispositifs de sécurité agissant en conjonction avec la commande ou le fonctionnement d'une machineCommandes exigeant l'emploi simultané de plusieurs parties du corps humain avec dispositifs, p. ex. des éléments sensibles, qui agissent sur la commande ou le fonctionnement de la machine lorsqu'une partie du corps humain se trouve dans ou près de la zone de danger les dispositifs étant des cellules photo-électriques ou d'autres dispositifs sensibles sans contact mécanique
• B27G 19/00 - Protecteurs ou dispositifs de sécurité adaptés aux scies à boisDispositifs auxiliaires facilitant une bonne utilisation des scies à bois

Abrégé

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.

Classes IPC  ?

• B27B 17/08 - Entraînements ou commandesDispositifs pour faire pivoter ou incliner la chaîne

Abrégé

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).

Classes IPC  ?

• H02H 11/00 - Circuits de protection de sécurité pour empêcher la commutation de mise en service dans le cas où une condition électrique de travail indésirable pourrait en résulter