Patent Publication Number: US-6905045-B2

Title: Thin film bag dispenser

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     This invention relates to a thin film bag dispenser, particularly to one having a simple structure for easily handling and made of low cost, 
     2. Description of the Prior Art 
     A roll of cylindrical film bags is positioned rotatably on a hollow shaft for wrapping things, with a separate bag looking like a PE film in daily use, and used for wrapping a substantially large things, for protecting them from water and dirt and also keeping them stably. A conventional cylindrical film bag is to be wrapped around an object by holding the two ends of a shaft tube with a roll of the cylindrical film bags and pulling out cylindrical film bags out of the roll and then is made to wrapped around objects. But this kind of handling is not convenient, as objects are mostly of a large size and rather heavy. A conventional cylindrical film bag dispenser shown in  FIG. 1  includes a holding cylinder  11 , and a rotatable cylinder  12  combined together. The holding cylinder  11  has a cylindrical shaft body  111  provided with one end surface formed with a grip hole (not shown) and the rotatable cylinder  12  fits rotatably around the, shaft body  111  of the holding cylinder  11 , having a plurality of ribs  121  spaced apart equidistantly around an outer surface. Then the rotatable cylinder  12  can fit in each of two end holes of a shaft tube for mounting a roll of cylindrical film bags (not shown) so that a separate cylindrical film bag may be pulled out by rotating the roll relative to the two rotatable cylinders  12 , with two hands of a user gripping the grip holes of the two holding cylinders  11 . 
     However, the conventional cylindrical film bag dispenser just described has a structure rather complicated, using comparatively much material, and accordingly resulting in high cost. 
     SUMMARY OF THE INVENTION 
     The purpose of the invention is to offer a thin film bag dispenser having a simple structure that includes a holding cylinder provided with an outer surface formed with an annular matching aperture for a small-sized rotatable ring to fit with so as to be freely rotate manually, enabling the thin film bag dispenser conveniently handled and made with a lower cost. 
    
    
     
       BRIEF DESCRIPTION OF DRAWWINGS 
       This invention will be better understood by referring to the accompanying drawings, wherein; 
         FIG. 1  is an exploded perspective view of a conventional thin film bag dispenser. 
         FIG. 2  is a perspective view of a thin film bag dispenser in the present invention; 
         FIG. 3  is an exploded perspective view of the thin film bag dispenser in the present invention; 
         FIG. 4  is a front view of a side of the thin film bag dispenser in the present invention; and, 
         FIG. 5  is a perspective view of the thin film bag dispenser in the present invention, showing it being used for wrapping an object. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     A preferred embodiment of a thin film bag dispenser in the present invention, as shown in  FIGS. 2 and 3 , includes a holding cylinder  20 , and a rotatable ring  30  as main components combined together. 
     The holding cylinder  20  has a cylinder body  21  and a grip hole  22  formed in an outer end surface, and the cylinder body  21  is provided with a preset number of lateral one-way blocks  211  sloping outward. Each one-way block  211  has a blocking surface  2111  formed a little higher than the outer surface of the holding cylinder  20 , and in this embodiment there are two one-way blocks  211  symmetrically formed. The cylindrical body  21  has a plurality of blocking ribs  212  formed axially spaced apart equidistantly on an outer surface and extending lengthwise from a left side to the intermediate portion and not reaching a right side so a curved matching surface  213  is defined between the left side of the holding cylinder  20  and each of the two one-way blocks  211 , and an annular fitting surface  223  is defined between the one-way blocks  211  and the line of the open ends of the blocking ribs  212 . 
     The rotatable ring  30  fits rotatably freely around the annular fitting surface  223  of the holding cylinder  20 . 
     Next, referring  FIGS. 4 and 5 , the holding cylinder  20  has a vertical sidewall  231  formed at an outer end and having an upper curved side  232  a little higher than the annular outer surface of the holding cylinder  20  and extending inward to function as a hand-resting member  23  for a hand of a user to rest thereon. The vertical sidewall  231  has a center hole  22  nearly rectangular shaped for fingers to extend therein, and a plurality of vertical reinforcing ribs  24  spaced apart on an inner surface. The vertical reinforcing ribs  24  define plural grooves  25  for fingers to extend to hold the cylinder  20  stably so as to prevent the film bag dispenser from slipping off. 
     Further, it is necessary to note that an aperture  26  is formed in two opposite sides of the vertical side wall  231 , respectively facing to the one-way blocks  211  so that a mold for shaping may be pulled off from the apertures  26 , not interfering with the hand of a user to reach in the grooves  25 . 
     Next, how to use the thin film bag dispenser is to be described. As shown in  FIG. 5 , the thin film bag dispenser is to be combined with the shaft tube  41  supporting a roll of cylindrical film bags  40  by the rotatable ring  30  inserted in the two end holes  411  of the shaft tube  41  to keep the thin film bag dispenser with the shaft tube  41  stably. Then a user grips the grip hole  21  with two hands resting on the hand-resting members  23  for ensuring stability of force exerting, in wrapping operation. As the rotatable ring  30  can rotate relative to the holding cylinder  20 , the cylindrical film bags  40  can be pulled to move out of the roll rotated with the holding cylinder  20 . 
     The invention has the following advantages, as seen from the foresaid description
         1. Compared with the conventional film bag dispenser consisting of the holding cylinder combined with the rotatable cylinder, the invention has the rotatable ring in conjunction with the holding cylinder, simplifying the structure in a large extent and reducing its cost accordingly.   2. The rotatable ring in the invention has a smaller dimension than the rotatable cylinder in the conventional, saving much material needed,   3. The grip hole is provided with the reinforcing ribs to reinforce the structure, and the grooves defined by the reinforcing ribs enable a user to hold the holding cylinder in handling to wrap a thin film bag on an object, elevating stability in operation in addition to no slipping of the hands off the holding cylinder.       

     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.