Patent Publication Number: US-6666898-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 capable to cut off an adhesive tape with a little force, economize cost and facilitate assembling. 
     A conventional adhesive-tape holder, as disclosed in the Taiwan Patent No. 5641377, 5906705, 5849144, titled “RETRACTABLE BLADE HAND HELD TAPE APPLICATORS”, has its flat plate and its blade connected by a spring and then pressed by a press plate having a positioning member serving as a fulcrum to push the blade forward to cut off an adhesive tape. 
     However, such a conventional adhesive-tape holder has the following defects. 
     1. The spring is dangled between the flat plate and the blade, so it is likely to be contracted to an unexpected position and hard to recover its position as anticipated. 
     2. A fixing plate is needed to be provided on the rear side of the press plate, and positioning members have to be respectively provided on opposite sides of the fixing plate to be respectively inserted in the positioning grooves of an adhesive-tape holder and of a side plate, thus, complicating its structure and increasing its cost. 
     SUMMARY OF THE INVENTION 
     The objective of the invention is to offer an adhesive-tape cutting device of an adhesive-tape holder, in which a blade is guided and restricted to move forward by a blade slide base and a blade holder, and a press plate is sandwiched between the support rod of a side plate and the blade slide base and pressed to produce a reaction to activate the blade to cut off an adhesive tape easily, needless to be additionally provided with any positioning member for keeping the press plate in place, economizing its cost and facilitating assembling. 
    
    
     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 the adhesive-tape cutting device in the present invention: 
     FIG. 3 is a side cross-sectional view of the adhesive-tape cutting device assembled in the present invention: 
     FIG. 4 is a side cross-sectional view of the adhesive-tape cutting device in an operating condition in the present invention. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     A preferred embodiment of an adhesive-tape cutting device of an adhesive-tape holder in the present invention, as shown in FIGS. 1 and 2, 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  fixed on a side edge. 
     The blade holder  20  has a fixing member  21  formed on one end to be engaged with one end of the adhesive-tape holder  10  (not shown). The blade holder  20  is provided with two fixing studs  22  with a threaded hole  23  respectively, a receiving groove  25  on the center and two slide grooves  24  respectively on the left and the right 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 pivotal shaft  32  fitted around with a roller  33 . The side plate  30  and the blade holder  20  are formed integral or combined together by screwing or inserting. 
     The blade  40  is fitted on the blade holder  20  and has two oval slide holes  41  corresponding to two fixing stubs  22  of the blade holder  20  for receiving these two fixing studs  22  and moving therein, and further has two fixing holes  42  conforming to two slide grooves  24  of the blade holder  20 . 
     The slide base  50  is mounted on the blade  40  to activate the blade  40  to shift. The slide base  50  is provided with two oval slide holes  51  on opposite ends to correspond to two slide holes  41  of the blade  40 . Then, two bolts  52  are respectively screwed through the slide holes  51 ,  41  and fixed with the threaded holes  23  of the blade holder  20 , but the bottom side of the head  521  of the bolt  52  doesn&#39;t tightly touch the top surface of the slide base  50  so as to permit the blade  40  and the slide base  50  to slide and shift therein. Besides, the slide base  50  is L-shaped and formed with a vertical short side  501  provided with a projecting stud  53  on the inner side and a spring  54  having its one end fitted around the projecting stud  53  and its other end inserted in the receiving groove  25  of the blade holder  20 . Further, the slide base  50  is provided at the bottom side with two positioning studs  55  protruding downward and respectively inserted through the positioning holes  42  of the blade  40  and then getting in the slide grooves  24  of the blade holder  20 . 
     The press plate  60  is formed with a vertical push plate  62  at the lower end to push against the vertical short side  501  of the slide base  50 . A curved support member  61  is formed between the press plate  60  and the vertical push plate  62  to closely rest on the support rod  31  of the side plate  30 . 
     In assembling, as shown in FIGS. 2 and 3, firstly, the blade  40  and the slide base  50  are orderly positioned 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 fixed together by means of the bolts  52 . The bolts  52  are merely screwed for keeping the blade  40  and the slide base  50  in place, but let their bottom sides not touch against the top surface of the slide base in order to let the slide holes  41  and  51  capable to slide along the fixing studs  22 , and thus the slide base  50  and the blade  40  can only shift back and forth. 
     Meanwhile, the positioning studs  55  of the slide base  50  are inserted through the positioning holes  42  of the blade  40  and then in the slide grooves  24  of the blade holder  20  so as to let the slide base  50  activate the blade  40  to move. In addition, the spring  54  has its two ends respectively push against the projecting stud  53  and the receiving groove  25  so that the slide base  50  can be forced to recover with quickness 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 support rod  31  of the side plate  30 , letting the support member  61  rest closely on the support rod  31  and the push plate  62  push against the vertical short plate  501  of the slide base  50 . 
     Lastly, the blade holder  20  has its fixing member  21  stably combined with the adhesive-tape holder  10 , and synchronously the side plate  30  together with the blade holder  20  is secured on the adhesive-tape holder  10  by screws (not shown) to fin is h assembling an adhesive-tape cutting device. 
     In using, as shown in FIGS. 3 and 4, the adhesive tape on the adhesive-tape base  12  is pulled out to pass through the roller  33  and get onto the press plate  60 . Subsequently, the adhesive tape is glued on the article to be adhered and then rotate the roller  33  to let the adhesive tape pulled out smoothly, and at the same time the adhesive tape can be pressed flat and smooth by the end edge of the press plate  60 . In case of cutting off the adhesive tape, just forcefully press the handle  11  on the article to be adhered and the top end of the press plate  60  will produce an action A. Synchronously the push plate  62  of the press plate  60  will give rise to a reaction B because the support rod  31  of the side plate  30  supporting 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  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 pressure of the handle, the slide base  50  together with the blade  40  will quickly recover by the resilient force of the spring  54 , ensuring safety in using. 
     As can be noted from the above description, this invention has the following advantages. 
     1. The bottom side  522  of the head  521  of the bolt  52  doesn&#39;t closely touch the top surface of the slide base  50 , enabling the slide base  50  and the blade  40  move back and forth. Besides, the blade  40  is sandwiched between the blade holder  20  and the slide base  50  to be guided and restricted to move back and forth smoothly and cut off the adhesive tape precisely. 
     2. The press plate  60  has its support member  61  sandwiched by the support rod  31  and the slide base  50  and kept in place therebetween, needless to be additionally provided with a fixing plate and a fixing member for securing a press plate as described in the conventional device, economizing its cost and facilitating assembling. 
     3. The press plate  60  has its curved support member  61  rested closely against the support rod  31  serving as a fulcrum to bring forth an action (A) and a reaction (B) by interaction, easy to cut off an adhesive tape with a little force. 
     While the preferred embodiment of the invention has 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.