1. Field of Invention
The present invention relates to a stapler capable of cutting staple legs one after another.
2. Background of Invention
WO 03/057417 A1 discloses a STAPLER WITH BENDING ARMS WHICH CUT THE STAPLER LEGS AGAINST A PAD. The stapler includes two bending arms 40 and 41 and a cutter 49 (see FIGS. 9 and 10). The bending arm 40 is pivotally installed by means of a pin 42. The bending arm 40 includes a lever 45 on a side of the pin 42 and a bending surface 44 on the other side of the pin 42. The bending arm 41 is pivotally installed by means of a pin 43. The bending arm 41 includes a lever 48 on a side of the pin 43 and a bending surface 47 on the other side of the pin 43. The cutter 49 is located between the bending surfaces 44 and 47. As the levers 45 and 48 are pivoted, the bending surfaces 44 and 47 bend and press stapler legs 53 and 54 against two cutting edges of the cutter 49. Thus, the staple legs 53 and 54 are cut. It however requires a large force to cut the stapler legs 53 and 54 simultaneously. The present invention is therefore intended to obviate or at least alleviate the problems encountered in prior art.
According to the present invention, a stapler includes a base, a cover, two clips, a feeding device and a bending and cutting device. The cover is installed on the base. The clips connect the cover with the base. The feeding device feeds staples. The security device ensures normal movement of the cover. The bending and cutting device bends and cuts the legs of each staple one after another.
The primary advantage of the stapler according to the present invention is that it requires a smaller force than the prior art because of the clips.
Other advantages and novel features of the invention will become more apparent from the following detailed description in conjunction with the attached drawings.
The present invention will be described via detailed illustration of the preferred embodiment referring to the drawings.
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The cover 20 includes two walls 23 extending from the cover 20. Each wall defines an aperture 231. The cover 20 defines two slots 22 and an opening 21.
To connect the base 10 with the cover 20, a pin 24 and two clips 14 are used. The pin 24 is inserted in the slots 112 and the apertures 231. Each clip 14 includes a lower end 142 hooking a related lug 13 and an upper end 141 inserted in a related slot 22. Two springs 25 are compressed between the base 10 and the cover 20. Each spring 25 receives a related boss 16 at an end.
The feeding device 30 includes a mount 31, a cartridge 32, a lever 33, two extensions 36 and a pin 37. The mount 31 is attached to the cover 20 by means of a fastener 34. The cartridge 32 is connected with the mount 31 for storing the staples 60. By means of a pin 35, the lever 33 is connected with the mount 31 for moving the cartridge 32, driving the staples 60 from the cartridge 32 and moving the cover 20. The extensions 36 extend from the lever 33. A pin 37 is connected with the mount 31.
The security device 40 includes a slide 41, a spring 43, a link 42, a pin 44 and a spring 45. The slide 41 includes two slots 411 defined therein, a slot 412 defined therein between the slots 411, a hook 413 formed thereon, two fins 414 formed thereon and two fins 415 formed thereon. The slide 41 is installed on the base 10. The slots 411 receive the hooks 15. The slot 412 receives the hook 151. The spring 43 includes an end hooked to the hook 413 and an opposite end hooked to the hook 151 so that the slide 41 is biased by the spring 43.
The link 42 includes two lateral members 422. Each lateral member 422 includes a lower end defining an aperture 423 for receiving the pin 12. Each lateral member 422 includes an upper end for contact with a related extension 36. Each lateral member 422 defines an aperture 421 for receiving a pin 44 that is for contact with the fins 415. The link 42 includes a hook 424 formed thereon. The spring 45 includes an end hooked to the hook 424 and an opposite end hooked to the pin 37.
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The cutting element 52 includes a first cutting portion 521 and a second cutting portion 522 thinner than the first cutting portion 521.
Each bending element 53 includes an upper end 531 for bending and pressing a first leg 61 of each staple 60 against the first cutting portion 57 and a lower end 532. The second bending element 53 includes an upper end 531 for bending and pressing a second leg 62 of each staple 60 against the second cutting portion 58 and a lower end 62.
The first lever 54 includes a lower end 541 in contact with the pad 55 and a middle portion 542 for pushing the lower end 532 of the first bending element 53. The second lever 54 includes a lower end 541 in contact with the pad 55 and a middle portion 542 for pushing the lower end 532 of the second bending element 53.
The cover 20 cannot be pivoted towards the base 10 because the pin 24 is hindered by means of the fins 414 from below.
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Furthermore, as the bending and cutting device 50 is made as a separate unit, it can be replaced with a new one when the cutting element 52 becomes obtuse after a long time of use. This saves money because the entire stapler does not have to be replaced with a new one as required in the prior art.
The present invention has been described via detailed illustration of the preferred embodiment. Those skilled in the art can derive variations from the preferred embodiment without departing from the scope of the present invention. Therefore, the preferred embodiment shall not limit the scope of the present invention defined in the claims.