Single-and-continual shot changeover device for a nailing gun

A single-and-continual shot changeover device for a nailing gun, said device combined with a trigger body of the nailing gun and actuated by a safety connect rod to move and push an air valve switch for firing a shot or striking a nail, said device comprising:

• a trigger shaft located in an interior of said trigger body and having a fitting stage formed in an intermediate portion and a slide shaft stage respectively at two sides of said fitting stage:
• a trigger inner member having a lower end pivotally fitted around said fitting stage of said trigger shaft and swinging by said safety connect rod to push said air valve switch;
• two springs respectively fitting around said two side shaft stages of said trigger shaft and having their inner ends resting against a sidewall of two ends of said fitting stage of said trigger shaft:
• two press buttons respectively fitting around said two slide shaft stages of said trigger shaft and having their inner surface resting against an outer end of said two springs, said press buttons respectively possible to be pushed outward by resiliency of said two springs and to be secured stably at one of two lengthwise points of said trigger body, said press buttons then possible to be pressed elastically inward to separate from said trigger body so that said press buttons may be shifted up and down together with said trigger shaft and said trigger inner member and secured at the other of said two lengthwise points, said trigger inner member controlled to separate or not from said safety connect rod so as to change firing a single shot or continual shot.