Patent ID: 7770771

Claim:
A stapler comprising: a main structure including a first shell member and a second shell member, a magazine assembly disposed in the main structure, a handle assembly pivotally installed to the main structure, an adjustable firing apparatus; wherein the adjustable firing apparatus comprises: a plunger member connected to an end of the handle assembly; a driving member including a first concavity, a second concavity formed on the first concavity and a space piercing therethrough, with the plunger member slideable along the first concavity; an adjusting means selectively received in the space of the driving member; and a rotation engaged member rotatably mounted on the adjusting means opposite to the driving member and including a first engaged portion and a second engaged portion, with the adjusting means selectively abutted with one of the first and second engaged portions to adjust the distance between the adjusting means and the magazine assembly for using staples/nails in various sizes, and an actuating means pivotally installed on the main structure and including a positioned portion protruding therefrom, with teeth formed on the actuating means opposite to the positioned portion and engaged with one of the first and second engaged portions of the rotation engaged member selectively.