Patent Publication Number: US-9850026-B2

Title: Easy-open can end opened by rotated bar

Description:
BACKGROUND 
     Technical Field 
     The subject matter described herein relates to an easy-open can end of a can and, and in certain embodiments to the opener to open the easy-open can end. 
     Description of the Related Art 
     The easy-open can ends are widely used in many containers, such as Aluminum or steel cans, typically filled with beer, soft drinks, tea, juice, water, concentrate, or the like. The traditional easy-open can is provided with an easy-open, stay-on-tab can end wherein a tab is secured to the end, such as the easy-open can end disclosed in U.S. Pat. No. 5,711,448. 
     However, the effort arm of the traditional easy-open can end is the tab, which is too short and can only contain one finger. Thus, a force that hurts a single finger may be required to open the tear panel in the easy-open can end while the tab fixed by the rivet could be broken by the required force. Further, the cost to assemble the tab and rivet on the easy-open can end cannot be saved. 
     Therefore, there is a requirement to address the above-mentioned issue. 
     BRIEF SUMMARY 
     To address the above-mentioned issues, an easy-open can end with a protrusion or impression formed on the tear panel is provided to be opened by a rotating bar horizontally rotated over the protrusion or impression. 
     The rotating bar may have a length equivalent to the diameter of the easy-open can, and the length is longer than a tab of the traditional easy-open can end. Thus, the rotating bar can provide a longer effort arm. And, the rotating bar can be rotated by two fingers, and thus can reduce the required force for each finger to open the easy-open can end. Moreover, a rotating bar is not required to be fixed in the easy-open can end, and thus the cost to assemble the tab and rivet on the easy-open can end is saved. 
     According to one embodiment of the present disclosure, an easy-open can end for making an opening therethrough suitable for pouring comprises: an end plate; a score line in the end plate defining most of the periphery of a tear panel, while leaving between the tear panel and the remainder of the end plate a hinge. The score line extends away from one end of the hinge, around a bight, and back to the other end of the hinge; and a protrusion formed on the tear panel wherein the protrusion is used for being pressed down by a rotating bar horizontally rotated over the protrusion or by a body vertically hitting the protrusion to cause relative vertical movement between the tear panel and the remainder of the end plate, rupture of the score line, and swinging of the tear panel down about the hinge to an open position. 
     According to another embodiment of the present disclosure, an easy-open can end for making an opening therethrough suitable for pouring comprises: an end plate; a score line in the end plate defining most of the periphery of a tear panel, while leaving between the tear panel and the remainder of the end plate a hinge. The score line extends away from one end of the hinge, around a bight, and back to the other end of the hinge; and an impression formed on the end plate with a slope on the tear panel and a main part on the remainder of the end plate wherein the impression is used for containing a downward protrusion of a rotating bar that is horizontally rotated over the tear panel from the slope to press down the tear panel to cause a relative vertical movement between the tear panel and the remainder of the end plate, rupture of the score line, and swinging of the tear panel down about the hinge to an open position. 
     According to another embodiment of the present disclosure, an opener for opening an easy-open can with a score line, a tear panel defined by the score line and a hinge, and a protrusion or an impression on an end plate, comprises: a rotating bar comprising two sections for being pushed close to each other or away from each other to adjust a horizontal length of the rotating bar, and a bottom used for being horizontally rotated over the tear panel to cause relative vertical movement between the tear panel and the remainder of the end plate, rupture of the score line, and swinging of the tear panel down about the hinge to an open position; and two fins connecting to the two sections and providing points pushed by fingers of a user to control the two sections. 
    
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS 
       In the drawings, identical reference numbers identify similar elements. The sizes and relative positions of elements in the drawings are not necessarily drawn to scale. For example, the shapes of various elements and angles are not drawn to scale, and some of these elements are arbitrarily enlarged and positioned to improve drawing legibility. Further, the particular shapes of the elements as drawn are not intended to convey any information regarding the actual shape of the particular elements, and they have been solely selected for ease of recognition in the drawings. 
         FIG. 1A  is a top view of an easy-open can end of a can with a protrusion according to one embodiment of the present disclosure; 
         FIG. 1B  is a cross-sectional view of the easy-open can end taken along a line A-A of  FIG. 1A ; 
         FIG. 1C  is a perspective view of the rotating bar comprising two inclined ends; 
         FIG. 1D  is a perspective view of the easy-open can end with hidden lines showing that a rotating bar may be set inside the extended wall; 
         FIGS. 2A and 2B  are perspective views illustrating steps for opening the easy-open can end of the embodiment shown in  FIG. 1A ; 
         FIG. 3A  is a top view of an easy-open can end with the tear panel having an extended part; 
         FIG. 3B  is a top view of an easy-open can end produced for rotating the rotating bar in the counterclockwise direction; 
         FIG. 3C  is a top view of an easy-open can end produced for rotating the rotating bar in the counterclockwise direction with the tear panel having an extended part; 
         FIGS. 3D and 3E  illustrate two further embodiments that the hinge is formed in a center line of the tear panel that passes through the center of the end plate and the center of the tear panel; 
         FIG. 4A  is a top view of an easy-open can end of a can with an impression having a slope on a tear panel according to one embodiment of the present disclosure; 
         FIG. 4B  is a cross-sectional view of the easy-open can end taken along a line A′-A′ of  FIG. 4A ; 
         FIG. 4C  is a perspective view of the rotating bar comprising two inclined ends and a downward protrusion; 
         FIG. 4D  is a perspective view of the easy-open can end with hidden lines showing that a rotating bar may be set inside the extended wall; 
         FIG. 5A  is a top view of an easy-open can end of a can with an impression having a slope on an extended part of the tear panel; 
         FIG. 5B  is a top view of an easy-open can end produced with an impression for rotating the rotating bar in the counterclockwise direction; 
         FIG. 5C  is a top view of an easy-open can end produced with an impression for rotating the rotating bar in the counterclockwise direction with the tear panel having an extended part; 
         FIGS. 5D and 5E  illustrate two further embodiments that the hinge is formed in a center line of the tear panel that passes through the center of the end plate and the center of the tear panel; 
         FIG. 5F  is a top view of an easy-open can end produced with both protrusion and impression for rotating the rotating bar in the clockwise direction; 
         FIG. 5G  is a top view of an easy-open can end produced with both protrusion and impression for rotating the rotating bar in the counterclockwise direction; 
         FIGS. 6A-6C  are end views of openers for opening easy-open can ends shown in the above-mentioned figures; 
         FIG. 7A  shows another easy-open can end with a protrusion and a flared extended wall; 
         FIG. 7B  is a cross-sectional view of the easy-open can end taken along the line A-A of  FIG. 7A ; 
         FIG. 7C  is a cross-sectional view of a rotating bar with two flexible hooks on two ends; 
         FIG. 8A  shows another easy-open can end with an impression and a flared extended wall; 
         FIG. 8B  is a cross-sectional view of the easy-open can end taken along the line A′-A′ of  FIG. 8A ; 
         FIG. 8C  is a cross-sectional view of a rotating bar comprising two flexible hooks on two ends and one downward protrusion in the bottom; 
         FIG. 9A  shows another easy-open can end with a protrusion and another flared extended wall; 
         FIG. 9B  is a cross-sectional view of the easy-open can end taken along the line A-A of  FIG. 9A ; 
         FIG. 9C  is a cross-sectional view of a rotating bar with two flexible hooks on two ends; 
         FIG. 10A  shows another easy-open can end with a protrusion and another flared extended wall; 
         FIG. 10B  is a cross-sectional view of the easy-open can end taken along the line A′-A′ of  FIG. 10A ; and 
         FIG. 10C  is a cross-sectional view of a rotating bar comprising two flexible hooks on two ends and one downward protrusion in the bottom. 
     
    
    
     DETAILED DESCRIPTION 
     It will be appreciated that although specific embodiments of the subject matter of this application have been described herein for purposes of illustration, various modifications may be made without departing from the spirit and scope of the disclosed subject matter. Accordingly, the subject matter of this application is not limited except as by the appended claims. 
     In the following description, certain specific details are set forth in order to provide a thorough understanding of various aspects of the disclosed subject matter. However, the disclosed subject matter may be practiced without these specific details. In some instances, well-known structures and methods of attaching structures to each other comprising embodiments of the subject matter disclosed herein have not been described in detail to avoid obscuring the descriptions of other aspects of the present disclosure. 
     Reference throughout the specification to “one embodiment” or “an embodiment” means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearance of the phrases “in one embodiment” or “in an embodiment” in various places throughout the specification are not necessarily all referring to the same aspect. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more aspects of the present disclosure. 
       FIG. 1A  is a top view of an easy-open can end of a can with a protrusion according to one embodiment of the present disclosure. An easy-open can end  100  for making an opening therethrough suitable for pouring comprises: an end plate  101 ; a score line  104  in the end plate  101  defining most of the periphery of a tear panel  108 , while leaving between the tear panel  108  and the remainder of the end plate  101  a hinge  109 . The score line  104  extends away from one end of the hinge  109 , around a bight, and back to the other end of the hinge  109 , and a protrusion  106  is formed on the tear panel  108 . 
     The protrusion  106  is used for being pressed down by a rotating bar  120  shown in  FIG. 1D  horizontally rotated over the protrusion  106  or by a body vertically hitting the protrusion  106  to cause relative vertical movement between the tear panel  108  and the remainder of the end plate  101 , rupture of the score line  104 , and swinging of the tear panel  108  down about the hinge  109  to an open position. 
       FIG. 1B  is a cross-sectional view of the easy-open can end taken along a line A-A of  FIG. 1A . The line A-A is a center line of the tear panel that passes through the center of the end plate and the center of the tear panel.  FIG. 1B  shows the protrusion  106 , the score line  104 , an extended wall  102 , and a rotating space B defined by the extended wall  102 . By referring to  FIGS. 1A, 1B and 1D , the extended wall  102  encircles the end plate  101  and thus defines a rotating space B, wherein a circular opening of the extended wall  102  is narrower than a circular bottom of the extended wall  102 . The rotating space B is used for containing the rotating bar  120  shown in  FIG. 1C ; and the extended wall  102  confines movement of the rotating bar  120 . 
       FIG. 1C  is a perspective view of the rotating bar  120  comprising two inclined ends  120   a ,  120   b . The rotating bar  120  is flexible or has two rounded corners on bottom of the two inclined ends  120   a ,  120   b , and thus the rotating bar  120  can be bent and set into the rotating space B through the narrower circular opening of the extended wall  102 . 
       FIG. 1D  is a perspective view of the easy-open can end with hidden lines showing that a rotating bar  120  may be set inside the extended wall  102 .  FIG. 1D  shows a condition that the rotating bar  120  is set in a position without the protrusion  106  before the tear panel  108  is swung down about the hinge  109  to an open position. 
       FIGS. 2A and 2B  are perspective views illustrating steps for opening the easy-open can end of the embodiment shown in  FIG. 1A .  FIG. 2A  shows that the rotating bar  120  is horizontally rotated over the protrusion  106  clockwisely in the direction of arrow C from the ramp  106   a  to press down the protrusion  106 , and thus the relative vertical movement between the tear panel  108  and the remainder of the end plate  101  causes initial rupture of the score line  104  in point  104   a  close to ramp  106   a  while the rupture of the score line  104  reaches points  104   b  and  104   c  in two directions. In other words, while the rotating bar  120  climbs over the protrusion  106  through the ramp  106   a , the rotating bar  120  keeps in the same level by pressing the protrusion  106  and the tear panel  108  down. After the rotating bar  120  passes the ramp  106   a , the tear panel  108  can be further pressed down because the rotating bar  120  continues pressing the protrusion  106  down.  FIG. 2B  shows that the rotating bar  120  is horizontally rotated to the end  106   c  of the protrusion  106  to further press down the protrusion  106  and the tear panel  108  while propagation of the rupture continues to the hinge  109  at point  104   d , the tear panel  108  is swung down about the hinge  109  to an open position. 
     To reduce the waste of resource, the rotating bar of the present invention can be a separable opener and the easy-open can may be produced without a rotating bar on its can end. Thus, the easy-open can end of the present invention can save a fixed opener, such as the stay-on-tab of the traditional easy-open can end disclosed in U.S. Pat. No. 5,711,448. In other words, a buyer may use his or her own opener with the same mechanism as the rotating bar to open the easy-open can end of the present invention, and thus the producer of the easy-open can saves the cost to manufacture and assemble the rotating bar. 
     Alternatively, an easy-open can may be manufactured with a rotating bar attached on its can end, and the rotating bar  120  of  FIG. 1C  may be included in the easy-open can end. 
       FIG. 3A  is a top view of an easy-open can end of a can with the tear panel having an extended part according to another embodiment of the present disclosure. The tear panel  108  further comprises an extended part defined by the score line  104  that further extends around another bight in point  104   a ′. And, a ramp  106   a ′ of the protrusion  106  is formed on the extended part of the tear panel. While the rotating bar reaches and press down the ramp  106   a ′, the stress will be concentrated on the tip of the extended part, i.e., the point  104   a ′, and thus the required force to initialize the rupture of the score line  104  in the point  104   a ′ can be reduced. 
     While the hinge  109  is formed in one side of the tear panel  108  relative to the center line of the tear panel  108 , i.e., the line A-A, the rotation of the rotating bar  120  can be started not only from the side distant from the hinge  109 , for example, in the clockwise direction C shown in  FIGS. 2A and 3A , but also from the side near the hinge  109 .  FIG. 3B  is a top view of an easy-open can end produced for starting the rotation of the rotating bar  120  from the side near the hinge  109 , for example, in the counterclockwise direction C′. In the example of  FIG. 3B , while the rotating bar  120  is rotated in the direction C′, the rupture of score line  104  may start from point  104   d ′ and progress to point  104   d  and point  104   c  in two directions. The protrusion  106 ′ may be shorter but higher than the protrusion  106  in  FIG. 1A . Similarly, the protrusion  106 ′ may also have a ramp  106   a ′ in the start point of the rotation of the rotating bar  120  to allow the rotating bar  120  climbing over the protrusion  106 ′. 
       FIG. 3C  is a top view of an easy-open can end with the tear panel  108  further comprising an extended part defined by the score line  104  that further extends around another bight in point  104   d ′ for starting the rotation of the rotating bar  120  from the side near the hinge  109 . And, a ramp  106   a ′ of the protrusion  106  is formed on the extended part of the tear panel  108 . While the rotating bar  120  reaches and press down the ramp  106   a ′, the stress will be concentrated on the tip of the extended part, i.e., the point  104   d ′, and thus the required force to initialize the rupture of the score line  104  in the point  104   d ′ can be reduced. 
       FIGS. 3D and 3E  illustrate two embodiments that the hinge  109  is formed in the center line of the tear panel  108 , i.e., the line A-A. Among them, the embodiment shown in  FIG. 3E  further comprises two extended parts of the tear panel  108  with two ramps  106   a ,  106   c  on the two extended parts of the tear panel  108 . The clockwise and counterclockwise rotation will cause the same ruptures with different starting and ending points in the tear panel  108  if the shape of the tear panel  108  is symmetry. 
     While  FIGS. 1A and 1B  illustrate that the extended wall  102  of the easy-open can end has a circular opening narrower than its circular bottom,  FIGS. 7A and 9A  illustrate another easy-open can ends with flared opens  103  on the extended walls  102 ′,  102 ″. 
       FIG. 7B  is a cross-sectional view of the easy-open can end taken along the line A-A of  FIG. 7A . The easy-open can end comprises the protrusion  106 , the score line  104 , and an extended wall  102 ′ with a flared opening  103  encircling the end plate  101  and defining a rotating space B′.  FIG. 7C  is a cross-sectional view of rotating bar  120 ′, which has two flexible hooks on two ends  120   a ′,  120   b ′. The rotating bar  120 ′ of  FIG. 7C  can be set into the rotating spaces B′ shown in  FIG. 7B  by hooking the flared opening  103 . Therefore, the rotating space B′ is used for containing the rotating bar  120 ′, and the extended wall  102 ′ confines movement of the rotating bar  120 ′. The easy-open can end and the rotating bar of  FIGS. 9A-C  have different shapes from those of  FIGS. 7A-C  while having the same mechanism. 
     Although the rotating bar of the present invention can be a separable opener, an easy-open can may be manufactured with a rotating bar attached on its can end, and the rotating bars  120 ′,  120 ″ of  FIGS. 7C and 9C  may be included in the easy-open can ends. 
     While a protrusion can be utilized to open an easy-open can, an impression can be also utilized to do the same.  FIG. 4A  is a top view of an easy-open can end of a can with an impression according to one embodiment of the present disclosure. An easy-open can end  100  for making an opening therethrough suitable for pouring comprises an end plate  101  and a score line  104  in the end plate  101  defining most of the periphery of a tear panel  108  while leaving between the tear panel  108  and the remainder of the end plate  101  a hinge  109 . The score line  104  extends away from one end of the hinge  109 , around a bight, and back to the other end of the hinge  109 ; and an impression  112  is formed on the end plate  101  with a slope  112   a  on the tear panel  108  and a main part on the remainder of the end plate  101 . 
     The impression  112  is used for containing a downward protrusion  122  of a rotating bar  120  that is horizontally rotated over the tear panel  108  from the slope  112   a  to press down the tear panel  108  to cause a relative vertical movement between the tear panel  108  and the remainder of the end plate  101 , rupture of the score line  104 , and swinging of the tear panel  108  down about the hinge  109  to an open position. 
       FIG. 4B  is a cross-sectional view of the easy-open can end taken along a line A′-A′ of  FIG. 4A . The line A′-A′ is a tangent line of circle  110  that passes through the impression  112 .  FIG. 4B  shows the impression  112 , the score line  104 , an extended wall  102 , and a rotating space B defined by the extended wall  102 . By referring to  FIGS. 4A, 4B and 4D , the extended wall  102  encircles the end plate  101  and thus defines a rotating space B, wherein a circular opening of the extended wall  102  is narrower than a circular bottom of the extended wall  102 . 
     Returning to  FIG. 4B , the rotating space B is used for containing the rotating bar  120  shown in  FIG. 4C , and the extended wall  102  confines movement of the rotating bar  120 .  FIGS. 4A and 4B  illustrate the score line  104  extends through the bottom of the slope  112   a  and defines the slope  112   a  as part of the tear panel  108 . The impression  112  is used for containing the downward protrusion  122  of the rotating bar  120  shown in  FIG. 4C . The downward protrusion  122  in the impression  112  will apply a horizontal force on the slope  112   a  and initializes the rupture of the score line  104  while the rotating bar  120  is horizontally rotated to the tear panel  108  from the slope  112   a.    
       FIG. 4C  is a perspective view of the rotating bar  120  comprising two inclined ends  120   a ,  120   b . The rotating bar  120  is flexible or has two rounded corners on bottom of the two inclined ends  120   a ,  120   b , and thus the rotating bar  120  can be bent and set into the rotating space B through the narrower circular opening of the extended wall  102 . 
       FIG. 4D  is a perspective view of the easy-open can end with hidden lines showing that a rotating bar  120  may be set inside the extended wall  102 .  FIG. 4D  shows a condition that the rotating bar  120  is set in a position over the impression  112  with the downward protrusion  122  inside the impression  112  before the rotating bar  120  is rotated clockwise and the tear panel  108  is swung down about the hinge  109  to an open position. The center line  110   a  of the impression  112  extends along the circle  110  to allow the movement of the downward protrusion  122  while the rotating bar  120  is rotated. 
     Although the rotating bar of the present invention can be a separable opener, an easy-open can may be manufactured with a rotating bar attached on its can end, and the rotating bar  120  of  FIG. 4C  may be included in the easy-open can end. 
       FIG. 5A  is a top view of an easy-open can end of a can according to another embodiment of the present disclosure. The tear panel  108  further comprises an extended part defined by the score line  104  that further extends around another bight in the impression  112 . And, the slope  112   a ′ of the impression  112  is on the extended part of the tear panel  108 . While the rotating bar  120  reaches and press down the slope  112   a ′, the stress will be concentrated on the tip of the extended part, and thus the required force to initialize the rupture of the score line  104  can be reduced. 
     While the hinge  109  is formed near one side of the tear panel  108  relative to a center line of the tear panel  108  that passes through the center of the end plate  101  and the center of the tear panel  108 , i.e., the line A-A shown in  FIG. 4A , the rotation of the rotating bar  120 ′ can be started not only from a side of the tear panel  108  distant from the hinge  109 , for example, in the clockwise direction C shown in  FIG. 4A , but also from another side of the tear panel  108  near the hinge  109 . 
       FIG. 5B  shows an embodiment that the rotation of the rotating bar  120 ′ is started from another side of the tear panel  108  near the hinge  109 , for example, in the counterclockwise direction C′. While the rotating bar  120  is rotated in the direction C′, the rupture of score line  104  may progress from point  104   d  to point  104   c . Similarly, the impression  112 ′ may also have a slope  112   a ′ in the tear panel  108 . 
       FIG. 5C  shows another embodiment that the rotation of the rotating bar  120 ′ is started from another side of the tear panel  108  near the hinge  109 . The tear panel  108  further comprises an extended part defined by the score line  104  that further extends around another bight in point  104   d ′. And, a slope  112   a ′ of the impression  112 ′ is formed on the extended part of the tear panel  108 . While the rotating bar  120 ′ reaches and press down the slope  112   a ′, the stress will be concentrated on the tip of the extended part, i.e., the point  104   d ′, and thus the required force to initialize the rupture of the score line  104  in the point  104   d ′ can be reduced. 
       FIGS. 5D and 5E  illustrate two further embodiments, each of which has a hinge  109  formed in a center line of the tear panel  108  that passes through the center of the end plate  101  and the center of the tear panel  108 . Among them, the embodiment shown in  FIG. 5E  further comprises two extended parts of the tear panel  108  with two slopes  112   a  on the two extended parts of the tear panel  108 . The clockwise and counterclockwise rotation will cause the same ruptures with different starting points and ending points in the tear panel  108  if the shape of the tear panel  108  is symmetry. 
       FIGS. 5F and 5G  illustrate embodiments, each of which has both protrusion and impression. The rotation of the rotating bar  120 ′ in  FIG. 5F  is started from a side of the tear panel  108  distant from the hinge  109  while the rotation of the rotating bar  120 ′ in  FIG. 5G  is started from another side of the tear panel  108  near the hinge  109 . To make the downward protrusion  122  go through both of impression  112 ,  112 ′ and protrusion  106 ,  106 ′, the protrusion  106 ,  106 ′ and the impression  112 ,  112 ′ are formed on the same circle  110  having the same center as the end plate  101 . And, the protrusion  106 ,  106 ′ has a ramp  106   a ,  106   a ′ close to the slope  112   a ,  112   a ′ of the impression  112 ,  112 ′. 
       FIG. 8A  shows another easy-open can end with flared extended wall  102 ′.  FIG. 8B  is a cross-sectional view of the easy-open can end taken along the line A′-A′ of  FIG. 8A . The easy-open can end comprises the impression  112 , the score line  104 , and an extended wall  102 ′ with a flared opening  103  on its top encircling the end plate  101  and defining a rotating space B′.  FIG. 8C  is a cross-sectional views of rotating bar  120 ′. The rotating bar  120 ′ has two flexible hooks on two ends  120   a ′,  120   b ′ and a downward protrusion  122  in the bottom, and the rotating bar  120 ′ can be set into the rotating spaces B′ shown in  FIG. 8B  by hooking the flared opens  103 . Therefore, the rotating space B′ is used for containing the rotating bar  120 ′, and the extended wall  102 ′ confines movement of the rotating bar  120 ′. 
     The easy-open can end and the rotating bar of  FIGS. 10A-C  have different shapes from those of  FIGS. 8A-C  while having the same mechanism. 
     Although the rotating bar of the present invention can be a separable opener, an easy-open can may be manufactured with a rotating bar attached on its can end, and the rotating bars  120 ′,  120 ″ of  FIGS. 8C and 10C  may be included in the easy-open can ends. 
       FIGS. 6A-6C  are end views of openers for opening easy-open can ends shown in the above-mentioned figures, each of which comprises a score line, a tear panel defined by the score line and a hinge, and a protrusion or an impression on an end plate. Each of the openers comprises a rotating bar comprising two sections  610   a ,  610   b  for being pushed close to each other or away from each other to adjust a length of the rotating bar. The bottoms of the two sections  610   a ,  610   b  are used for being horizontally rotated over the tear panel to cause relative vertical movement between the tear panel and the remainder of the end plate, rupture of the score line, and swinging of the tear panel down about the hinge to an open position. Each of the openers has two fins  618   a ,  618   b  connecting directly or indirectly to the two sections  610   a ,  610   b  and providing points pushed by fingers of a user to control the two sections  610   a ,  610   b.    
       FIG. 6A  shows an opener further comprises two rods  606   a ,  606   b  comprising an axle  604  in a intersection of the two rods  606   a ,  606   b . The first section  610   a  of the two sections  610   a ,  610   b  comprises a stick  612 , and the second section  610   b  of the two sections  610   a ,  610   b  comprises a hole  614 . The two fins  618   a ,  618   b  are on top of the two rods  606   a ,  606   b , and the stick  612  is inserted into the hole  614  with a part  612   a  of the stick  612  located inside the hole  614 . The two sections  610   a ,  610   b  are pushed close to each other or away from each other by controlling the two rods  606   a ,  606   b  to control a depth that the stick  612  inserts into the hole  614 . 
       FIG. 6B  shows another opener with the rotating bar further comprising two notches  620   a ,  620   b . The notches  620   a ,  620   b  are between the two sections  610   a ,  610   b  and makes the rotating bar flexible to make it easier to push the two sections  610   a ,  610   b  close to each other or away from each other. Although this embodiment is illustrated with two notches  620   a ,  620   b , either of them could be enough to make the rotating bar flexible. 
       FIG. 6C  shows another opener further comprises a spring  616 . The first section  610   a  of the two sections  610   a ,  610   b  comprises a stick  612 ; and the second section  610   b  of the two sections  610   a ,  610   b  comprises a hole  614 . The stick  612  is inserted into the hole  614  with a part  612   a  of the stick  612  located inside the hole  614 . And, The spring  616  covers the stick  612  and connects to the two sections  610   a ,  610   b  to produce elasticity between the two sections  610   a ,  610   b  while the two sections  610   a ,  610   b  are pushed close to each other or away from each other. 
     The various embodiments described above can be combined to provide further embodiments. All of the U.S. patents, U.S. patent application publications, U.S. patent applications, foreign patents, foreign patent applications and non-patent publications referred to in this specification and/or listed in the Application Data Sheet are incorporated herein by reference, in their entirety. Aspects of the embodiments can be modified, if necessary to employ concepts of the various patents, applications and publications to provide yet further embodiments. 
     These and other changes can be made to the embodiments in light of the above-detailed description. In general, in the following claims, the terms used should not be construed to limit the claims to the specific embodiments disclosed in the specification and the claims, but should be construed to include all possible embodiments along with the full scope of equivalents to which such claims are entitled. Accordingly, the claims are not limited by the disclosure.