Patent Publication Number: US-7210649-B2

Title: Membrane packing dispenser

Description:
BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   This invention relates to a membrane packing dispenser, particularly to one able to enlarge a holding space for facilitating holding and applicable to various membrane reels with a little difference in size. 
   2. Description of the Prior Art 
   A conventional membrane packing dispenser  10 , as shown in  FIG. 1 , includes a holding sleeve  11  and a rotary shaft sleeve  12 . The holding sleeve  11  is formed with a sleeve body  111  to be received in the sleeve body  121  of the rotary shaft sleeve  12  and has it s lower end firmly engaged with the lower end of the rotary shaft sleeve  12 , enabling the rotary shaft sleeve  12  and the holding sleeve  11  to rotate relatively. The sleeve body  121  of the rotary shaft sleeve  12  has its outer wall surface provided with a plurality of elongate engage ribs  122  to be fixedly engaged with the inner walls of the shaft holes in the opposite ends of the central shaft tube of a membrane reel. Thus, a user&#39;s hands can get in the accommodating spaces of the sleeve bodies  11  of the two opposite holding sleeves  11  to rotate the holding sleeve  11  together with the rotary shaft sleeves  12  for releasing of the membrane of the membrane reel fitted on the two rotary shaft sleeves  12 . 
   However, the diameter of the shaft tube of a common membrane reel is fixed in size; therefore, the outer diameter of the cylindrical body  121  of the rotary shaft sleeve  12  must agree with the inner diameter of the central shaft tube of the common membrane reel. Further, since the sleeve body  111  of the holding sleeve  11  is to be fitted in the interior of the cylindrical body  121  of the rotary shaft sleeve  12 ; therefore, the sleeve body  111  and the accommodating space  112  of the holding sleeve  11  are restricted in size. If the accommodating space  112  of the holding sleeve  11  is too narrow and small, a comparatively big palm can hardly get in the accommodating space for holding and may be hurt in case of operating forcefully. Furthermore, although the diameters of the shaft tubes of common membrane reels are fixed in size, yet there may be still a little error between them; therefore, it is hard to guarantee that every membrane reel can be firmly fitted with the engaged ribs  122  of the sleeve body  121  of the rotary shaft sleeve  12 , likely to render the membrane reel unable to be fitted on the sleeve body  121  of the rotary shaft sleeve  12  or impossible to be secured tightly due to excessive slackness. 
   SUMMARY OF THE INVENTION 
   The objective of the invention is to offer a membrane packing dispenser including a holding sleeve and a rotary shaft sleeve. The cylindrical portion of the rotary shaft sleeve is step-shaped and formed with a lower portion to be fitted with a membrane reel and an upper portion for receiving the cylindrical portion of the holding sleeve therein. The lower portion has its outer wall bored with plural slots respectively disposed therein with a tightening plate having its upper opposite sides respectively fixed with an engage projection. The lower portion of the rotary shaft sleeve has its interior secured with a circular projection having plural support ribs extending outward from the outer edge and respectively connected with the intermediate portion of the tightening plate. The engage projections on the tightening plate are positioned a little higher than the outer wall surface of the lower portion. Thus, the lower portion of the rotary shaft sleeve can be firmly engaged with the inner walls of, the opposite ends of a membrane reel by means of the engage projections of the tightening plates. The engage projections of the tightening plates can be diametric ally pressed to shift elastically; therefore, the rotary shaft sleeves of the membrane packing dispenser in the present invention can be applied for various membrane reels with a little difference in size. In addition, matching with the upper portion of the rotary shaft sleeve, which has a comparatively large diameter, the holding sleeve to be fitted in the upper portion of the rotary shaft sleeve can be formed with a comparatively large accommodating space for facilitating a user&#39;s hand to extend therein for holding. 

   
     BRIEF DESCRIPTION OF DRAWINGS 
     This invention will be better understood by referring to the accompanying drawings, wherein: 
       FIG. 1  is an exploded perspective view of a conventional membrane packing dispenser: 
       FIG. 2  is a perspective view of a membrane packing dispenser in the present invention: 
       FIG. 3  is another perspective view of the membrane packing dispenser in the present invention: 
       FIG. 4  is a partial exploded perspective view of the membrane packing dispenser in the present invention: 
       FIG. 5  is a partial side-sectional view of the membrane packing dispenser in the present invention: 
       FIG. 6  is a cross-sectional view of the inner structure of a rotary shaft sleeve in the present invention: and 
       FIG. 7  is a cross-sectional view of membrane packing dispenser having the rotary shaft sleeve fitted with a membrane reel in the present invention. 
   

   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
   A preferred embodiment of a membrane packing dispenser in the present invention, as shown in  FIGS. 2 ,  3  and  4 , includes a holding sleeve  20  and a rotary shaft sleeve  30  combined together. 
   The rotary shaft sleeve  30  is formed with a cylindrical portion  31  for receiving and positioning the cylindrical portion  21  of the holding sleeve  20 . The cylindrical portion  21  of the holding sleeve  20  has its lower end fixed with a projecting engage member  22  to be inserted and engaged in the shaft hole  32  in the lower end of the cylindrical body  31  of the rotary shaft sleeve  30  to enable the holding sleeve  20  and the rotary shaft sleeve  30  to rotate together for releasing of a membrane. The cylindrical portion  31  of the rotary shaft sleeve  30  has its outer side edge extending upward diametrically and forming a circular stopping wall  33  and an annular projecting wall  34  extending forward and having its outer circumferential surface formed with numerous slide-stopping lines  341 . The cylindrical portion  21  of the holding sleeve  20  has its outer side edge extending outward and then bent reversely to form a lip-shaped rim  23  to be properly covered around the circular projection  34  of the rotary shaft sleeve  30 . A press member  231  able to be diametrically and elastically pressed is provided at a proper location of the lip-shaped rim  23 , and a frictional block  24  is secured under the press member  231  to be moved downward together with the press member  231  and pressed on the slide-stopping lines  341  of the circular projection  34  of the rotary shaft sleeve  30  for stopping the rotary shaft sleeve  30  from rotating. The sleeve body  21  of the holding sleeve  20  has its interior formed with an accommodating space  25  for an operator&#39;s hand to extend therein, and a holding member  26  is formed in the accommodating space  25  for the operator to hold thereon. 
   In addition, the cylindrical portion  31  of the rotary shaft sleeve  30  is step-shaped and formed with a lower portion  31   a  and an upper portion  31   b . The lower portion  31   a  has its interior formed with a recessed groove  311  with a comparatively small diameter, while the upper portion  31   b  has its interior formed with an accommodating space  312  with a comparatively large diameter for receiving therein the cylindrical portion  21  of the holding sleeve  20 . The lower portion  31   a  of the rotary shaft sleeve  30  has its side wall and a part of the bottom bored with three slots  313  spaced apart equidistantly at proper locations, while the upper portion  31   b  ha s its longitudinal circular wall connected with the lower portion  31   a  bored with three insert grooves  314  respectively communicating with the three slots  313 , with a tightening plate  315  inserted in each slot  313  and the insert groove  314 . The recessed groove  311  of the rotary shaft sleeve  30  has its lower side formed integral with a circular projection  316  having three bar-shaped support ribs  317  extending outward diametrically from the outer circumferential wall, spaced apart equidistantly and respectively connected with the intermediate portions of the tightening plates  315 . Additionally, each tightening plate  315  has its upper opposite sides respectively fixed with an elongate engage projection  318  positioned a little higher than the outer surface of the lower portion  31   a  and able to be diametrically pressed to shift elastically. Each engage projection  318  is formed with an arc-shaped upper edge and has its inserting end formed with a conical surface  319  having function of guiding. 
   In using, as shown in  FIG. 7 , firstly, the lower portion  31   a  of the rotary shaft sleeves  30  of a dispenser is aligned to the shaft hole  411  of the central shaft tube  41  of a membrane reel  40 . Then, the lower portion  31   a  of the rotary shaft sleeve  30  is guided by the conical surfaces  319  at the inserting ends of the engage projections  318  and inserted in the shaft hole  411 . Since the engage projections  318  of the tightening plates  315  can be diametrically and flexibly shifted, they can be inserted in the shaft hole  411  with a little difference in size. The engage projections  318  of the tightening plates  315  can be firmly engaged with the inner wall of the shaft hole  411  of the central shaft tube  41  of the membrane reel  40  to avoid sliding between them and enable the membrane reel  40  to rotate together with the rotary shaft sleeve  30  and to let the membrane  42  released out. 
   Specifically, the lower portion  31   a  of the rotary shaft sleeve  30  of the membrane packing dispenser of this invention is fixed on the outer surface with plural tightening plates  315  able to be shifted elastically; therefore, even if the shaft holes  411  of various membrane reels  40  are a little different in size, they still can be firmly fitted with the lower portion  31   a  of the rotary shaft sleeve  30  by means of the tightening plates  315  that can be elastically adjusted in position, elevating applicability of the membrane packing dispenser. 
   In addition, the cylindrical body  31  of the rotary shaft sleeve  30 , is step-shaped and formed with the lower portion  3   a  and the upper portion  31   b ; therefore, the lower portion  31   a  of the sleeve body  31  with a comparatively small diameter can be fitted with a membrane reel  40 , while the upper portion  31   b  with a comparatively large diameter can receive and position the cylindrical portion  21  of the holding sleeve  20  therein. Thus, matching with the upper portion  31   b  of the rotary shaft sleeve  30 , which has a comparatively large diameter, the cylindrical portion  21  of the holding sleeve  20  can be formed with a comparatively large accommodating space  25  for a comparatively big hand to extend therein conveniently and clasp the holding member  26  smoothly, having excellent effects in holding and operating. 
   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.