Patent Application
20090223341
The present invention relates to a paper punch with consecutive links which activate punch heads to punch sheets in sequence so as to save effort.
A conventional paper punch 6 is shown in
However, it requires a significant force to punch a thick layer of sheets and the multiple punch heads are applied a strong reaction force from the sheets of paper, this makes the punching action to be difficult for some users.
The present invention intends to provide a paper punch which includes an arm, a first link and a second link, each of the arm, the first link and the second link activates a punch head in sequence so that the user can easily punch with less force applied to the arm.
The present invention relates to a paper punch which comprises an arm having a pivotal end pivotably connected to one of connection plates of a support part fixed on a base. A torsion spring is received in the pivotal end of the arm and an elongate recess is defined in the arm. A first link includes a first rolling end movably engaged with the elongate recess in the arm and a first fixed end is connected to the other one of the connection plates on the support part. A second link includes a second rolling end movably engaged with the elongate recess in the arm and a second fixed end of the second link is pivotably connected to yet another connection plate. The second rolling end is located beneath the first rolling end. A plurality of punch units each have a frame, a punch head and a spring which is mounted to the punch head. The frames are connected beneath of the support part. Respective top ends of the punch heads extend through the through holes in the support part. The first link, the second link and the arm respectively contact the top ends of the punch heads. Respective lower ends of the punch head movably extend through the frames. The support part and the punch units are fixed to the base.
The primary object of the present invention is to provide a paper punch which includes an arm, a first link and a second link, each of which activates a punch head and the three punch heads are lowered to punch sheets of paper one by one when pivoting the arm of the paper punch. By this way, less force is needed to operated the paper punch.
The present invention will become more obvious from the following description when taken in connection with the accompanying drawings which show, for purposes of illustration only, a preferred embodiment in accordance with the present invention.
Referring to
An arm 1 has a pivotal end 13 which is pivotably connected to one of the connection plates 31 and a torsion spring 14 is received in the pivotal end 13. An elongate recess 11 is defined in the arm 1 and a rail 12 extends from an inside of the elongate recess 11 of the arm 1. A first pin 15 extends through the pivotal end 13.
A link unit 2 includes a first link 21 and a second link 22, wherein the first link 21 includes a first rolling end 211 movably engaged with the rail 12 in the elongate recess 11 in the arm 1 and a first fixed end 213 which is pivotably connected to another one of the connection plates 31. The second link 22 includes a second rolling end 221 movably engaged with the rail 12 in the elongate recess 11 in the arm 1 and a second fixed end 223 which is pivotably connected to yet another connection plate 31. The first link 21 includes a first roller 212 connected to the first rolling end 211 and the second link 22 includes a second roller 222 connected to the second rolling end 221, the first and second rollers 212, 222 are movable along the rail 12 in the elongate recess 11. The second rolling end 221 is located beneath the first rolling end 211. The first link 21 includes a second pin 214 connected thereto and the second link 22 includes a flange 224 extending outward from a lower end thereof.
The support part 3 includes a plurality of through holes 32 and an aperture 33 defined through the support part 3. An end of the torsion spring 14 contacts against the first pin 15 and the other end of the torsion spring 14 is inserted into the aperture 33.
The punch units 4 each have a frame 41, a punch head 42 and a spring 43 which is mounted to the punch head 42. Each of the punch heads 42 includes a groove 421 with which a clip 422 is engaged, the springs 43 in the frames 41 contacts the clips 422 respectively. The frames 41 connected beneath of the support part 3 and respective top ends of the punch heads 42 extend through the through holes 32 in the support part 3. The second pin 214 of the first link 21, the flange 224 of the second link 22 and the first pin 15 of the arm 1 respectively contact the top ends of the punch heads 42. Respective lower ends of the punch head 42 movably extend through the frames 41 and the slots 411 located at lower ends of the frames 41. Paper sheets can be inserted into the slots 411 so as to be punched when the punch heads 42 are lowered.
As shown in
When releasing the arm 1, the torsion spring 14 pushes the arm 1 backward and the first and second links 21, 22 are pivoted upward to the status as shown in
While we have shown and described the embodiment in accordance with the present invention, it should be clear to those skilled in the art that further embodiments may be made without departing from the scope of the present invention.
