Patent Publication Number: US-6705374-B2

Title: Adhesive-tape cutting device of an adhesive-tape holder

Description:
BACKGROUND OF THE INVENTION 
     This invention relates to an adhesive-tape cutting device of an adhesive-tape holder, particularly to one having a position-limiting device provided between the vertical short side of a slide base and the push plate of a flattening plate to prevent the slide base from sliding leftward or rightward. 
     The adhesive-tape holder disclosed in the Taiwan Patent No. 090220363, titled “ADHESIVE-TAPE CUTTING DEVICE OF AN ADHESIVE-TAPE HOLDER”, need not be provided with any fixing device between a flattening plate and a support rod as well as a slide base, not only saving force in operation, but saving producing cost and facilitating assembling as well. However, the structure of such an adhesive-tape cutting device still leaves something to be desired. 
     However, the press plate in the adhesive-tape cutting device of an adhesive-tape holder just mentioned above has no securing means, so the object of this invention is to improve this drawback. 
     SUMMARY OF THE INVENTION 
     The objective of the invention is to offer an adhesive-tape cutting device of an adhesive-tape holder, provided with a position-limiting device between the vertical short side of a slide base and the push plate of a flattening plate to restrict the position of the slide base not to slide leftward or rightward. 
    
    
     BRIEF DESCRIPTION OF DRAWINGS 
     This invention will be better understood by referring to the accompanying drawings, wherein: 
     FIG. 1 is a perspective view of an adhesive-tape cutting device of an adhesive-tape holder in the present invention: 
     FIG. 2 is an exploded perspective view of a first preferred embodiment of the adhesive-tape cutting device of an adhesive-tape holder in the present invention: 
     FIG. 3 is a side cross-sectional view of the first preferred embodiment of the adhesive-tape cutting device assembled in the present invention: 
     FIG. 4 is a side cross-sectional view of the first preferred embodiment of the adhesive-tape cutting device in an operating condition in the present invention: 
     FIG. 5 is a side cross-sectional view of a second preferred embodiment of the adhesive-tape cutting device assembled in the present invention. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     One preferred embodiment of an adhesive-tape cutting device of an adhesive-tape holder in the present invention, as shown in FIGS. 1,  2 ,  3  and  4 , includes an adhesive-tape holder  10 , a blade holder  20 , two side plates  30 , a blade  40 , a slide base  50  and a press plate  60  as main components combined together. 
     The adhesive-tape holder  10  has a handle  11  formed under and an adhesive-tape base  12  disposed on a side edge. 
     The blade holder  20  is formed with a fixing member  21  on one end to be engaged with one end of the adhesive-tape holder  10  (not shown). The blade holder  10  is provided with two fixing studs  22  respectively having a threaded hole  23 , a receiving groove  25  in the center and two slide grooves  24  respectively at the left side and the right side of the receiving groove  25 . 
     The two side plates  30  respectively have a column-shaped support rod  31  and a pivotal shaft  32  provided at a proper position above and below the blade holder  20  to be combined together with the adhesive-tape holder  10 , with the support rod  31  formed with an arcuate surface  311 , and the pivotal shaft  32  fitted around with a roller  33 . The two side plates  30  and the blade holder  20  are formed integral or combined together by inserting or screwing. 
     The blade  40  is mounted on the blade holder  20 , having two oval slide holes  41  for respectively receiving two fixing studs  22  of the blade holder  20  and move so that the blade  40  may move forward and backward therein. The blade  40  is further provided with two fixing holes  42  matching with two slide grooves  24  of the blade holder  20 . 
     The slide base  50  is fitted on the blade  40  to activate the blade  40  to shift together forward and backward. The slide base  50  is formed with two oval slide holes  51  in the upper surface to match with two slide holes  41  of the blade  40  so as to let two bolts  52  respectively screw through the slide holes  51 ,  41  and then fixedly fastened with the threaded holes  23  of the blade holder  20 . Nevertheless, the bottom side  522  of the head  521  of the bolt  52  doesn&#39;t tightly contact with the upper surface of the slide base  50  in order to allow the blade  40  and the slide base  50  to slide back and forth therein. In addition, the slide base  50  is L-shaped and formed with a vertical short side  501  provided with a projecting stud  53  on the inner wall, and a spring  54  having one end fitted around the projecting stud  53  and the other end inserted in the receiving groove  25  of the blade holder  20 . The slide base  50  is further provided at a bottom side with two positioning studs  55  protruding downward and respectively inserted through the positioning holes  42  of the blade  40  and then extending in the slide grooves  24  of the blade holder  20 . 
     The press plate  60  is formed with a vertical push plate portion  62  at the lower end for pushing against the vertical short side  501  of the slide base  50 , having a curved support member  61  formed between the press plate  60  and the vertical push plate portion  62  to closely rest on the support rod  31  of side plate  30 . 
     A key point of improvement in the invention is a position limit device, which consists of two position-limiting holes  56  respectively bored at opposite sides of the projecting stud  53  of the vertical short side  501  of the slide base  50 , and two insert studs  63  provided in the press plate  60  and respectively fixed on opposite ends of its vertical push plate portion  62  to be received in the two position-limiting holes  56 , so that the press plate  60  and the slide base  50  are restricted in a position not to slide leftward or rightward. Further, the diameter of the position-limiting hole  56  of the slide base  50  is larger than that of the insert stud  63  of the press plate  60 , letting the insert stud  63  able to move properly in the position-limiting hole  56 . 
     In assembling, firstly, the blade  40  and the slide base  50  are orderly disposed on the blade holder  20  to let the slide holes  41 ,  51  of the blade  40  and the slide base  50  fit around the fixing studs  22  of the blade holder  20  and then screwed together by means of the bolts  52 . The bolts  52  are screwed simply for keeping the blade  40  and the slide base  50  in place, but let the bottom sides  522  of their heads  521  not tightly touch the top surface of the slide base  50  so as to permit the slide holes  41  and  51  able to slide along the fixing studs  22 , and thus the slide base  50  and the blade  40  can merely shift back and forth. 
     At the same time, the positioning studs  55  of the slide base  50  are respectively inserted through the positioning holes  42  of the blade  40  and then get into the slide grooves  24  of the blade holder  20  to enable the blade  40  and the slide base  50  to move together. Additionally, the spring  54  has its two ends respectively push against the projecting stud  53  and the receiving groove  25 , therefore the slide base  50  can be forced to recover quickly by the resilient force of the spring  54 . 
     Next, the press plate  60  has its curved support member  61  inserted sideward in between the slide base  50  and the arcuate surface  311  of the support rod  31  of the side plate  30 , letting the support member  61  rest closely on the arcuate surface  311  of the support rod  31 . Then, the insert studs  63  of the push plate  62  are respectively inserted in the position-limiting holes  56  of the slide base  50 , rendering the press plate  60  and the slide base  50  unable to slide leftward or rightward. 
     Lastly, the blade holder  20  has its fixing member  21  fixedly combined with the adhesive-tape holder  10 , and in the meantime the left side plate  30  together with the blade holder  20  is stably fixed on the adhesive-tape holder  10  by means of screws (not shown) to finish assembling an adhesive-tape cutting device. 
     In using, as shown in FIG. 4, the adhesive tape on the adhesive-tape base  12  is pulled out to pass through the roller  33  and get onto the flattening plate  60 . Afterward, the adhesive tape is glued on the article to be adhered and then turns around the roller  33  to let the adhesive tape pulled out smoothly and synchronously pushed down by the end edge of the press plate  60 . To cut off the adhesive tape, just forcefully press down the handle  11  to let the adhesive tape laid on the article being adhered, and as a result an action (A) will occur on the top end of the press plate  60  and synchronously a reaction (B) will be produced on the push plate portion  62  to push against the slide base  50 , because the support rod  31  of the side plate  30  propping up the support member  61  serves as a fulcrum. As the reaction (B) is larger than the resilient force of the spring  54 , the push plate portion  62  is forced to push the slide base  50  together with the blade  40  to move forward to cut off the adhesive tape. 
     On the contrary, in case of releasing the handle  11 , the slide base  50  together with the blade  40  will quickly recover its original position by the resilient force of the spring  54 , thus ensuring safety in using. 
     The first preferred embodiment of a position-limiting device in the present invention, as shown in FIG. 2, is to have the push plate portion  62  provided with the two insert studs  63  respectively received in two position-limiting holes  56  of the slide base  50  to prevent the press plate  60  and the slide base  50  from sliding leftward or rightward. 
     A second preferred embodiment of a position-limiting device in the present invention, as shown in FIG. 5, is to have the vertical short side  501  of the slide base  50  provided with two insert studs  57 , and have the push plate  62  of the flattening plate  60  bored with two position-limiting holes  64  for respectively receiving the two insert studs  57 , equally making the press plate  60  and the slide base  50  unable to slide sideward. 
     While the preferred embodiments have been described above, it will be recognized and understood that various modifications may be made therein and the appended claims are intended to cover all such modifications that may fall within the spirit and scope of the invention.