A nail-driving gun includes a gun body that has a handle and a nail-shooting seat. A safety device includes an upper plate, a lower plate, and a safety rod. The upper and lower plates can move synchronously between top and bottom plates of the nail-shooting seat. The safety rod has a front end that is attached fixedly to a rear end portion of the assembly of the upper and lower plates. The upper and lower plates have front ends that project forward from the nail-shooting seat and that can be pressed against a wall so as to move the safety rod to a rear limit position, where the trigger member can be actuated to shoot a nail from the nail-shooting seat.

A trigger assembly for a staple gun includes a trigger with an activation member received therein and an adjusting member engaged with the trigger. A cam rod rotatable extends through the body of the staple gun, the passage at an end of the trigger and an eccentric hole in the adjusting member. The adjusting member has a lug which can be engaged with two of the positioning notches defined in the body of the staple gun. The activation plate and the trigger can be lowered or lifted by rotating the adjusting member, and this adjustment changes the relative positions between the activation member, the valve of the staple gun and the safety plate so as to have single shooting or auto shooting feature.

A trigger device used in single shooting and double shooting of a nail driver comprises a machine body having a safety device at a front end of the machine body; a switch having an eccentric shaft pivotally installed to the machine body and an adjusting body pivotally installed to the eccentric shaft; and a triggering device having a trigger, a movable inner sheet and an elastomer. One end of the trigger is pivotally installed to the eccentric shaft of the switch; and another end of the trigger is pivotally to the movable inner sheet which resists against the eccentric shaft. The elastomer is installed to a valve rod and resists against the movable inner sheet. When the safety rod and the trigger are pressed, by the interaction of the safety device, switch and the triggering device, the nail driver is operated to beat nail one time or several times continuously.

A single/continuous dual firing mode trigger_structure used in an air nailing gun for single/continuous firing control in which a switching mechanism is provided in the trigger and adapted to selectively control the operation of the trigger between a single firing mode and a continuous firing mode.

A trigger switch mechanism of a nail gun is pivotally attached between two side plates of a trigger of the nail gun. The switch mechanism includes a blocking piece pivotally attached to a safety slide rod and a trigger valve rod of the nail gun. Each of the side plates includes an axis hole, and two blocking grooves are disposed in the axis hole. The switch mechanism includes a plurality of blocking teeth, and a spring is disposed between one of the side plate and the switch mechanism to abut the switch mechanism and nest the blocking teeth into the blocking groove for stopping the switch mechanism. The switch mechanism includes a dial portion for being dialed by a hand of the operator, which is capable of deviating the blocking teeth from the blocking grooves to release the switch mechanism, and rotating the switch mechanism to adjust the position of the blocking piece relative to the safety slide rod, so as to realize conveniently switching the operation modes of the trigger of the nail gun.