Patent ID: 7152516

Claim:
A paper punch comprising: a base ( 10 ) with a plurality of frames ( 20 ) extending from a top of the base ( 10 ), each frame ( 20 ) including a hollow column ( 21 ) which is fixed on the base ( 10 ) and each column ( 21 ) having a driving gear ( 23 ) received therein, a moving member ( 22 ) movably located in front of each of the frames ( 20 ) and driven by the driving gear ( 23 ) in each of the frames ( 20 ), each moving member ( 22 ) connected to a punching head ( 24 ); a handle assembly ( 30 ) co-rotatably connected to the driving gears ( 23 ) in the frames ( 20 ) and including a plurality of handles ( 32 ), each handle ( 32 ) having two end caps ( 34 ) connected on two sides thereof, and a ratchet assembly ( 40 ) received in each of the frames ( 20 ) and having two ratchet wheels ( 41 ) connected to the driving gear ( 23 ), two driving pawls ( 42 ) and two return pawls ( 43 ), each of the end caps ( 34 ) having one of the two driving pawls ( 42 ) and one of the return pawls ( 43 ) received therein, each of the ratchet wheels ( 41 ) located between the driving pawl ( 42 ) and the return pawl ( 43 ) in each end cap ( 34 ), each of the ratchet wheels ( 41 ) having a first tooth ( 411 ), a second tooth ( 412 ) and a return tooth ( 413 ), the first and second teeth ( 411 , 412 ) having two respective inclined surfaces with the same inclination and the return tooth ( 413 ) having an inclined surface that is opposite to the two inclined surfaces of the first and second teeth ( 411 , 412 ), the driving pawls ( 42 ) engaged with the first teeth ( 411 ) and the second teeth ( 412 ) in sequence to rotate the ratchet wheels ( 41 ) and the driving gear ( 23 ) in two times of downward pivotal movement of the handles ( 32 ), the return teeth ( 413 ) engaged with the return teeth ( 413 ) of the ratchet wheels ( 41 ) and rotating the ratchet wheels ( 41 ) and the driving gear ( 23 ) by pivoting the handles ( 32 ) upward after the two times of downward pivotal movement of the handles ( 32 ).