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A safety device for a nailer has a movable element movable between a locking condition and a release firing condition. At least one lock has a stopping end movable to engage an abutment fixed to or carried by the movable element, for stopping it in the locking condition. When disengaged, the stoppin

A safety device for a nailer has a movable element movable between a locking condition and a release firing condition. At least one lock has a stopping end movable to engage an abutment fixed to or carried by the movable element, for stopping it in the locking condition. When disengaged, the stopping end allows translation to the release position. The lock is also provided with an elastic element which acts in the direction of the stopping condition, with an arming mechanism acting counter to the elastic element, for shifting the lock and the respective stopping end for moving to the armed condition. An operator, to put the nailer in the armed and released conditions, must act on the arming mechanism to free the abutment from the stopping end, and he must place the movable element in the release condition to shoot the nail by pulling a trigger.

대표청구항 ▼

1. A safety device for a nailer having an actuator for expulsion of a fastener in a shooting direction and having a movable element movable between a locking condition where the nailer is inhibited from operation and a release condition where the movable element does not block the nailer making it p

1. A safety device for a nailer having an actuator for expulsion of a fastener in a shooting direction and having a movable element movable between a locking condition where the nailer is inhibited from operation and a release condition where the movable element does not block the nailer making it possible to fire a fastener by actuating a trigger of said nailer, the safety device comprising: at least one lock having a stopping end movable between a stop condition which interferes with an abutment provided on the movable element, stopping the movable element in said locking condition, and an armed condition where the stopping end allows translation of said abutment, allowing the abutment to reach the release condition;said lock having an elastic element acting in the direction of the stopping condition and an arming mechanism for acting counter to the elastic element and for shifting the lock and the respective stopping end into the armed condition, such that the arming mechanism is manually actuated to free the abutment from the stopping end to put the nailer in the armed and release conditions, and the movable element is movable into the release condition wherein the nailer is actuatable for shooting the fastener upon action on the trigger;the abutment consisting of a contact safety lock which moves together with the movable element in a direction parallel to the shooting direction, wherein the lock and the respective stopping end translate along a direction perpendicular or inclined with respect to said firing direction;a cylinder having a piston slidable in a pneumatically sealed manner therein, the piston fixed to the lock which forms a stein of said piston, the stein slidable in a pneumatically sealed manner through a passing hole formed through an end wall of the cylinder;a chamber of the cylinder provided with a calibrated or adjustable vent hole that provides flow communication between said chamber and an outside environment; and,the elastic element acting in compression on the piston, or on an extension of the stein opposite to the stopping end. 2. The device according to claim 1 wherein the abutment has an end, a shoulder or a protrusion configured to abut the stopping end when in the stopping condition and has at least an inclined plane surface configured to slidably match with the stopping end for bringing the stopping end back to the armed condition when the abutment passes from the locking condition to the release condition. 3. The device according to claim 1 wherein the vent hole is formed near said end wall having the passing hole or through the end wall or through the stein and further comprising an optional passage that provides flow communication between the cylinder chamber and the outside environment, the optional passage leading to the chamber end opposite to the chamber end having the passing hole, and connects the chamber with the outside environment only when the piston is in the armed condition or almost in the armed condition. 4. The device according to claim 1 wherein the arming mechanism consists of a manually operable knob fixed to the extension of the stein opposite to the stopping end. 5. The device according to claim 1 wherein the arming mechanism comprises a valve controlled by a button for providing flow communication between a compressed gas source and the cylinder chamber, defined between the piston and the end wall having the passing hole, via a connecting duct, where the button actuation causes pressure to increase in the chamber, the piston moved thereby to the armed condition. 6. The device according to claim 5 wherein the valve is associated with firing elements of the trigger, the button having a return spring and being arranged on a side of a handle associated with said trigger. 7. The device according to claim 5 wherein the connecting duct has an input connection, and an output connection respectively for the valve and the cylinder, and at least one joint therebetween, the connecting duct composed of either flexible pipes or rigid ducts, and optionally including a gas filter and/or a control valve. 8. The device according to claim 5 wherein the stein and the piston are provided with respective longitudinal pass through cavities and the vent hole develops along a radial section through a side wall of the stein, and said through cavities between the chamber and the outside environment, the through cavity of the stein having a pin with a tip is directed towards a shoulder or bottleneck of the vent hole and being supported by a threaded body engaged in a nut screw formed in the cavity portion of the stein adjacent to the stopping end where rotation of the threaded body adjusts a time span of a return to the stopping condition. 9. The device according to claim 2 wherein the arming mechanism comprises a valve controlled by a button for providing flow communication between a compressed gas source and the cylinder chamber, defined between the piston and the end wall having the passing hole, via a connecting duct, where the button actuation causes pressure to increase in the chamber, the piston moved thereby to the armed condition. 10. The device according to claim 9 wherein the valve is associated with firing elements of the trigger, the button having a return spring and being arranged on a side of a handle associated with said trigger. 11. The device according to claim 9 wherein the connecting duct has an input connection, and an output connection respectively for the valve and the cylinder, and at least one joint therebetween, the connecting duct composed of either flexible pipes or rigid ducts, and optionally including a gas filter and/or a control valve. 12. The device according to claim 9 wherein the stein and the piston are provided with respective longitudinal pass through cavities and the vent hole develops along a radial section through a side wall of the stein, and said through cavities between the chamber and the outside environment, the through cavity of the stein having a pin with a tip is directed towards a shoulder or bottleneck of the vent hole and being supported by a threaded body engaged in a nut screw formed in the cavity portion of the stein adjacent to the stopping end where rotation of the threaded body adjusts a time span of a return to the stopping condition. 13. The device according to claim 6 wherein the connecting duct has an input connection, and an output connection respectively for the valve and the cylinder, and at least one joint therebetween, the connecting duct composed of either flexible pipes or rigid ducts, and optionally including a gas filter and/or a control valve. 14. The device according to claim 6 wherein the stem and the piston are provided with respective longitudinal pass through cavities and the vent hole develops along a radial section through a side wall of the stem, and said through cavities between the chamber and the outside environment, the through cavity of the stem having a pin with a tip is directed towards a shoulder or bottleneck of the vent hole and being supported by a threaded body engaged in a nut screw formed in the cavity portion of the stem adjacent to the stopping end where rotation of the threaded body adjusts a time span of a return to the stopping condition.