Patent ID: 8087137

Claim:
A flat clamping hand tool structure comprising: a left arm; and a right arm, wherein an inner edge of one end of the left arm is pivotally connected with an inner edge of one end of the right arm through a first pivot member, an outer edge of the end of the left arm is pivotally connected with a first end of a left swing plate through a second pivot member, and an outer edge of the end of the right arm is pivotally connected with a first end of a right swing plate through a third pivot member; the left swing plate includes a left limit portion protruding from a middle portion thereof; the right swing plate includes a right limit portion protruding from a middle portion thereof, the left limit portion being provided with first teeth and the right limit portion being provided with second teeth for meshing with each other, and the left limit portion and the right limit portion being pivotally connected with a U-shaped upper holder and a U-shaped lower holder through a fourth pivot member and a fifth pivot member, respectively; the upper holder includes a pair of parallel first holder bits; the lower holder includes a pair of parallel second holder bits; the first and second holder bits are provided with aligned guiding blocks; a second end of the left swing plate is pivotally connected with a U-shaped left clamping seat through a first fixing member; a second end of the right swing plate is pivotally connected with a U-shaped right clamping seat through a second fixing member; the left clamping seat includes upper and lower surfaces each formed with a left mounting slot for the first fixing member to be inserted therein; the right clamping seat includes upper and lower surfaces each formed with a right mounting slot for the second fixing member to be inserted therein; inside the left and right clamping seats are formed with guiding grooves corresponding to the guiding blocks of the upper and lower holders; the left clamping seat has one side provided with a left fixing portion which faces a right fixing portion provided on one side of the right clamping seat; and the left and right fixing portions are coupled with working members, respectively.