Patent Publication Number: US-9834368-B2

Title: Automatic shoe cover dispenser with shoe cover cartridge

Description:
CROSS REFERENCE OF RELATED APPLICATION 
     This is a Continuation-In-Part application that claims the benefit of priority under 35U.S.C.§119 to a non-provisional application having an application Ser. No. 14/973,737 and a filing date of Dec. 18, 2015, which is a Continuation-In-Part application that claims the benefit of priority under 35U.S.C.§119 to a non-provisional application having an application Ser. No. 14/515,544 and a filing date of Oct. 16, 2014. 
    
    
     NOTICE OF COPYRIGHT 
     A portion of the disclosure of this patent document contains material which is subject to copyright protection. The copyright owner has no objection to any reproduction by anyone of the patent disclosure, as it appears in the United States Patent and Trademark Office patent files or records, but otherwise reserves all copyright rights whatsoever. 
     BACKGROUND OF THE PRESENT INVENTION 
     Field of Invention 
     The present invention relates to an automatic shoe-cover machine, and more particularly to an automatic shoe cover dispenser with a shoe cover cartridge, wherein the shoe cover cartridge is replaceable with the shoe cover dispenser to automatically and continuously dispense the shoe covers of the shoe cover cartridge. 
     Description of Related Arts 
     Automatic shoe cover machine is a device designed to solve the problem of having people to take off their shoes before entering a room under sanitary control, wherein the shoe cover machine can dispense the shoe cover to wrap the shoe of the user. Accordingly, the automatic shoe cover machines are widely used in public health establishments, like hospital, laboratory, living room and other sanitation environments. Accordingly, the conventional shoe cover is adapted to dispense the shoe covers one-by-one via different dispensing mechanisms. No matter which type of dispensing mechanism is used, the shoe covers must be overlapped and stacked in series. 
     The first type of dispensing mechanism is that the shoe covers are affixed one-by-one, wherein a rear edge of the former shoe cover is attached to a front edge of the following shoe cover. As a result, during the former shoe cover is pulled out of the machine for dispensing, the following shoe cover is also pulled by the former shoe cover. However, the major drawback of this dispensing mechanism is that the production process for packaging the shoe covers is relatively complicated since the shoe covers must be attached one-by-one. The installation of the shoe covers is inconvenient that the shoe covers must be carefully loaded in the dispensing mechanism. Once the connection between two sequent shoe covers is broken, the shoe covers cannot be dispensed anymore. In other words, this shoe cover arrangement is not designed for mass production. 
     Another type of dispensing mechanism is that the shoe covers are individually stacked with each other, wherein the dispensing mechanism incorporates with a motorized device to dispense the shoe covers one-by-one. Accordingly, since the motorized device is used, the mechanism must be electrically connected to a power source. In other words, the mechanism must be electrically plugged to the electric outlet or must be incorporated with a battery. Without any electrical power, the dispensing mechanism will not be operated. In addition, the shoe covers must be installed into the dispensing mechanism one-by-one so as to complicate the installation process of the shoe covers. 
     SUMMARY OF THE PRESENT INVENTION 
     The invention is advantageous in that it provides an automatic shoe cover dispenser with a shoe cover cartridge, wherein the shoe cover cartridge is replaceable with the shoe cover dispenser to automatically and continuously dispense the shoe covers of the shoe cover cartridge. 
     Another advantage of the invention is to provide an automatic shoe cover dispenser, wherein the shoe cover cartridge is configured as a shoe cover cartridge to be loaded to the automatic shoe cover dispenser, so as to simplify the installation process of the shoe cover cartridge. 
     Another object of the present invention is to provide an automatic shoe cover dispenser, which is simple in structure with inexpensive manufacture and maintenance cost. In particular, no motorized device is required to dispense the shoe covers for the automatic shoe cover dispenser. In other words, the automatic shoe cover dispenser does not require any electrical power for dispensing operation. 
     Another object of the present invention is to provide an automatic shoe cover dispenser, wherein the shoe covers are packed together without attaching with each other. In particular, the following shoe cover is interlocked by the former shoe cover, such that after the former shoe cover is pulled and dispensed, the following shoe cover is automatically pulled by the former shoe cover to its standby position. 
     Another object of the present invention is to provide an automatic shoe cover dispenser, wherein each of the shoe covers is orderly pulled to enlarge its opening at the standby position. 
     Another object of the present invention is to provide an automatic shoe cover dispenser, which does not require to alter the original structural design of the automatic shoe cover dispenser, so as to minimize the manufacturing cost of the automatic shoe cover dispenser incorporating with the shoe cover cartridge. 
     Another object of the present invention is to provide an automatic shoe cover dispenser, wherein no expensive or complicated structure is required to employ in the present invention in order to achieve the above mentioned objects. Therefore, the present invention successfully provides an economic and efficient solution for providing a simple dispensing configuration for the automatic shoe cover dispenser. 
     Additional advantages and features of the invention will become apparent from the description which follows, and may be realized by means of the instrumentalities and combinations particular point out in the appended claims. 
     According to the present invention, the foregoing and other objects and advantages are attained by an automatic shoe cover dispenser which comprises a dispenser system and a shoe cover cartridge. 
     The dispenser system has a cartridge cavity and a shoe disposing opening, and defines a dispensing direction from the cartridge cavity to the shoe disposing opening. 
     The shoe cover cartridge is replaceably disposed in the cartridge cavity, wherein said shoe cover cartridge comprises a guiding unit which comprises two spaced apart elongated guiding arms, and a plurality of shoe covers overlapped with each other in a sequential manner that one of the shoe covers is pulled into an open-up condition as a standby shoe cover and a subsequent shoe cover followed by the standby shoe cover. Each of the shoe covers comprises a cover body having a cover opening defined at a top peripheral edge, a front interlocking unit provided at a front side of each of the cover bodies, and a rear interlocking unit provided at a rear side of each of the cover bodies, wherein the front and rear interlocking units are slidably engaged with the guiding arms at a position that the front interlocking unit at the subsequent shoe cover is located in front of the rear interlocking unit at the standby shoe cover along the guiding arms. Therefore, when the standby shoe cover is pulled to the shoe disposing opening at the dispensing direction, the subsequent shoe cover is pulled by the standby shoe from the cartridge cavity, so as to dispense the shoe covers in a sequential order. 
     In accordance with another aspect of the invention, the present invention comprises a method of dispensing shoe cover to be worn on a shoe of a user, comprising the following steps. 
     (1) Provide a shoe cover cartridge by the following steps. 
     (1.1) Provide a plurality of shoe covers each having a cover opening, a front interlocking unit at a front side of each of the shoe covers, and a rear interlocking unit provided at a rear side of each of the shoe covers. 
     (1.2) Overlappedly stack the shoe covers with each other in a sequential manner that one of the shoe covers is pulled into an open-up condition as a standby shoe cover and a subsequent shoe cover followed by the standby shoe cover. 
     (1.3) Slidably engage the shoe covers at two spaced apart elongated guiding arms via the front and rear interlocking units at a position that the front interlocking unit at the subsequent shoe cover is located in front of the rear interlocking unit at the standby shoe cover along the guiding arms. 
     (2) Load the shoe cover cartridge in a cartridge cavity of a dispenser system. 
     (3) Pull the standby shoe cover from the cartridge cavity of the dispenser system to a shoe disposing opening thereof for enabling the shoe of the user to dispose in the standby shoe cover through the cover opening. 
     (4) Automatically pull the subsequent shoe cover by the standby shoe cover after the standby shoe cover is dispensed, so as to dispense the shoe covers in a sequential order. 
     Still further objects and advantages will become apparent from a consideration of the ensuing description and drawings. 
     These and other objectives, features, and advantages of the present invention will become apparent from the following detailed description, the accompanying drawings, and the appended claims. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view of an automatic shoe cover dispenser according to a preferred embodiment of the present invention. 
         FIG. 2  illustrates a shoe cover cartridge of the automatic shoe cover dispenser according to the above preferred embodiment of the present invention, illustrating the dispensing arms detachably coupling to the guiding arms end-to-end. 
         FIG. 2A  illustrates the first stopper at the free end portion of the dispensing arm according to the above preferred embodiment of the present invention. 
         FIG. 3  is a perspective view of the shoe cover according to the above preferred embodiment of the present invention. 
         FIG. 4  illustrates the shoe covers being interlocked with each other according to the above preferred embodiment of the present invention. 
         FIG. 5  illustrates the standby shoe cover being pulled at the shoe disposing opening of the dispenser system according to the above preferred embodiment of the present invention. 
         FIG. 6  illustrates the standby shoe cover being pulled out of the shoe disposing opening of the dispenser system according to the above preferred embodiment of the present invention. 
         FIG. 7  illustrates the subsequent shoe cover being pulled at the shoe disposing opening of the dispenser system after the standby shoe cover is dispensed according to the above preferred embodiment of the present invention. 
         FIG. 8  illustrates a first alternative mode of the first and second interlocking units of the shoe cover according to the above preferred embodiment of the present invention. 
         FIG. 9  illustrates a second alternative mode of the first and second interlocking units of the shoe cover according to the above preferred embodiment of the present invention. 
         FIG. 10  illustrates the interlocking configuration of the second alternative mode of the first and second interlocking units of the shoe cover according to the above preferred embodiment of the present invention. 
         FIG. 11  illustrates a modification of the automatic shoe cover dispenser according to the above preferred embodiment of the present invention. 
         FIG. 12  illustrates the first and second stoppers of the modified automatic shoe cover dispenser according to the above preferred embodiment of the present invention. 
         FIG. 13  illustrates another alternative of the first and second stoppers of the modified automatic shoe cover dispenser according to the above preferred embodiment of the present invention. 
         FIG. 14  illustrates a third alternative mode of the first stopper of the modified automatic shoe cover dispenser according to the above preferred embodiment of the present invention. 
         FIG. 15  illustrates a fourth alternative mode of the first stopper of the modified automatic shoe cover dispenser according to the above preferred embodiment of the present invention. 
         FIG. 16  illustrates a fifth alternative mode of the first stopper of the modified automatic shoe cover dispenser according to the above preferred embodiment of the present invention. 
         FIG. 17  illustrates an alternative mode of the shoe cover cartridge of the shoe cover dispenser according to the above preferred embodiment of the present invention, illustrating the shoe covers being manually pulled one-by-one from the shoe cover dispenser. 
         FIG. 18  illustrates a modification of the guiding unit of the automatic shoe cover dispenser according to the above preferred embodiment of the present invention, illustrating the shoe covers being packed at the detachable guiding tubes. 
         FIG. 19  illustrates the modification of the guiding unit of the automatic shoe cover dispenser according to the above preferred embodiment of the present invention, illustrating the shoe covers being loaded to the dispenser system from the detachable guiding tubes. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     The following description is disclosed to enable any person skilled in the art to make and use the present invention. Preferred embodiments are provided in the following description only as examples and modifications will be apparent to those skilled in the art. The general principles defined in the following description would be applied to other embodiments, alternatives, modifications, equivalents, and applications without departing from the spirit and scope of the present invention. 
     Referring to  FIG. 1  of the drawings, an automatic shoe cover dispenser according to a preferred embodiment is illustrated, wherein the automatic shoe cover dispenser comprises a dispenser system  10  and a shoe cover cartridge  20 . 
     The dispenser system  10  has a cartridge cavity  11  and a shoe disposing opening  12 , and defines a dispensing direction from the cartridge cavity  11  to the shoe disposing opening  12 . According to the preferred embodiment, the cartridge cavity  11  is formed at a rear portion of the dispenser system  10  and the shoe disposing opening  12  is formed at a front portion of the dispenser system  10  at a top side thereof. Therefore, the shoe disposing opening  12  is a top opening at the front portion of the dispenser system  10 . The dispenser system  10  further has a front opening  13  communicating with the shoe disposing opening  12  and a rear opening  14  communicating with the cartridge cavity  11 . 
     The shoe cover cartridge  20  is replaceably disposed in the cartridge cavity  11  of the dispenser system  10 , wherein the shoe cover cartridge  20  can be loaded or unloaded to the cartridge cavity  11  of the dispenser system  10  through the rear opening  14  thereof. According to the preferred embodiment, the shoe cover cartridge  20  comprises a plurality of shoe covers  30  overlapped with each other in a sequential manner to be loaded in the cartridge cavity  11  of the dispenser system  10  to form a stack of shoe cover. One of the shoe covers  30 , i.e. the foremost position of the shoe cover  30  in the stack of shoe cover, is pulled into an open-up condition as a standby shoe cover  30 A and a subsequent shoe cover  30 B followed by the standby shoe cover  30 A. In other words, the dispenser system  10  will firstly dispense the standby shoe cover  30 A and then the subsequent shoe cover  30 B in a sequential order. Each of the shoe covers  30  is made of fabric or plastic material that can be folded and stacked with each other. 
     As shown in  FIG. 3 , each of the shoe covers  30  comprises a cover body  31  having a cover opening  311  defined at a top peripheral edge, a front interlocking unit  32  provided at a front side of the cover body  31 , and a rear interlocking unit  33  provided at a rear side of cover body  31 , wherein the shoe of the user is able to dispose in the cover body  31  through the cover opening  311 , such that the shoe cover  30  will wrap around the shoe of the user. Accordingly, the top peripheral edge of each of the shoe covers  30  is an elastic edge that an elastic element  34  is provided at the top peripheral edge of each of the shoe covers  30  to shrink the size of the cover opening  311  of the shoe cover  30 . 
     As shown in  FIG. 3 , the first interlocking unit  32  contains two spaced apart first interlocking holes  321  formed at the front side of the cover body  31  below the top peripheral edge thereof. Each of the first interlocking holes  321  is a through hole formed at the front side of the cover body  30  close to the sidewall thereof. In other words, a distance between the two first interlocking holes  321  is slightly smaller than a width of the cover body  30  between two sidewalls. 
     Likewise, the second interlocking unit  33  contains two spaced apart second interlocking holes  331  formed at the rear side of the cover body  31  below the top peripheral edge thereof. Each of the second interlocking holes  331  is also a through hole formed at the rear side of the cover body  30  close to the sidewall thereof. In other words, a distance between the two second interlocking holes  331  is slightly smaller than a width of the cover body  30  between two sidewalls. Accordingly, the first and second interlocking holes  321 ,  331  are preferably identical that the first interlocking holes  321  are aligned with the second interlocking holes  331  respectively. 
     The shoe cover cartridge  20  further comprises a guiding unit  40  which comprises two spaced apart elongated guiding arms  41  extended parallelly with each other. Accordingly, the front and rear interlocking units  32 ,  33  are slidably engaged with the guiding arms  41  at a position that the front interlocking unit  321  at the subsequent shoe cover  30 B is located in front of the rear interlocking unit  331  at the standby shoe cover  30 A along the guiding arms  41 , such that when the standby shoe cover  30 A is pulled to the shoe disposing opening  12  at the dispensing direction, the subsequent shoe cover  30 B is pulled by the standby shoe cover  30 A from the cartridge cavity  11 , so as to dispense the shoe covers  30  in a sequential order. It is worth mentioning that the standby shoe cover  30 A does not physically connect to the subsequent shoe cover  30 B by any connection means. In other words, the shoe covers  30  are overlapped and held without any connection between every two of the shoe covers  30 . However, the interlocking position between the standby shoe cover  30 A and the subsequent shoe cover  30 B at the guiding arm  41  will ensure the subsequent shoe cover  30 B to be pulled by the standby shoe cover  30 A during the dispensing operation. 
     As shown in  FIG. 4 , three shoe covers  30  are shown the interlocking configuration at the guiding arms, wherein the first shoe cover  30  is embodied as the standby shoe cover  30 A, the second shoe cover  30  is embodied as the subsequent shoe cover  30 B followed by the standby shoe cover, and the third shoe cover  30  is embodied as a third shoe cover  30 C followed by the subsequent shoe cover  30 B. As it is mentioned above, the first and second interlocking units  32 ,  33  are the first and second interlocking holes  321 ,  331  respectively. 
     The guiding arms  41  extend through all the first and second interlocking holes  321 ,  331  of the shoe covers  30 A,  30 B,  30 C. In particular, the guiding arms  41  are arranged to slidably extend through the first interlocking holes  321  at the front side of the standby shoe cover  30 A such that the front side of the standby shoe cover  30 A is located at the foremost position to be pulled firstly. The guiding arms  41  are arranged to slidably extend through the second interlocking holes  331  at the rear side of the standby shoe cover  30 A such that the standby cover shoe  30 A is slidably supported at the guiding arms  41 . Likewise, the guiding arms  41  are arranged to slidably extend through the first and second interlocking holes  321 ,  331  of the subsequent shoe cover  30 B and the third shoe cover  30 C such that the subsequent shoe cover  30 B and the third shoe cover  30 C are slidably supported at the guiding arms  41 . 
     As shown in  FIG. 4 , the interlocking configuration of the shoe covers  30  is that the first interlocking holes  321  of the subsequent shoe cover  30 B is located in front of the second interlocking hole  331  of the standby shoe cover  30 A along the guiding arms  41 . In other words, the guiding arms  41  are arranged to first extend through the second interlocking hole  331  of the standby shoe cover  30 A and then the first interlocking holes  321  of the subsequent shoe cover  30 B. Likewise, the first interlocking holes  321  of the third shoe cover  30 C is located in front of the second interlocking hole  331  of the subsequent shoe cover  30 B along the guiding arms  41 . As a result, when the standby shoe cover  30 A is pulled forwardly, the rear side of the standby shoe cover  30 A will pull the front side of the subsequent shoe cover  30 B forward, so as to dispense the shoe covers  30  one-by-one in a sequential order. 
     As shown in  FIG. 2 , the dispenser system  10  comprises two dispensing arms  15  extended from the cartridge cavity  11  to the shoe disposing opening  12  and detachably coupled with the guiding arms  41  end-to-end respectively, so as to guide the shoe covers  30  to dispense at the shoe disposing opening  12 . Therefore, the standby shoe cover  30 A is slidably pulled from the guiding arms  41  to the dispensing arm  15  during dispensing operation. Accordingly, when the shoe cover cartridge  20  is loaded in the cartridge cavity  11  of the dispenser system  10 , the front free ends of the guiding arms  41  are coupled at the rear free ends of the dispensing arms  15  respectively. The shoe disposing opening  12  is formed at the front free ends of the dispensing arms  15 . 
     Each of the dispensing arms  15  has a sliding portion  151  extended from the corresponding guiding arm  41  and an expanding portion  152  extended to the shoe disposing opening  12 . Accordingly, the sliding portions  151  of the dispensing arms  15  are parallel with each other, wherein a distance between the sliding portions  151  of the dispensing arms  15  is the same as a distance between the guiding arms  41 . Therefore, the shoe covers  30  can smoothly slide from the guiding arms  41  to the sliding portions  151  of the dispensing arms  15 . The distance between the sliding portions  151  of the dispensing arms  15  is smaller than a distance between the expanding portions  152  of the dispensing arms  15  in such a manner that when the standby shoe cover  30 A is slid at the expanding portions  152  of the dispensing arms  15 , the cover opening  311  of the standby cover body  30 A is expanded to open up the standby cover body  30 A at the shoe disposing opening  12 . Accordingly, the distance between the guiding arms  41 , i.e. the distance between the sliding portions  151  of the dispensing arms  15 , is smaller than a width of each of the shoe covers  30  such that the shoe cover  30  can be packed along the guiding arms  41  in a compact structure. In addition, the distance between the expanding portions  152  of the dispensing arms  15  is slightly smaller than the width of each of the shoe covers  30 , such that when the standby shoe cover  30 A is slidably pulled to support at the expanding portions  152  of the dispensing arms  15 , the cover opening  311  of the standby shoe cover  30 A is stretched by the expanding portions  152  of the dispensing arms  15  so as to open up the cover opening  311  of the standby cover body  30 A. The width of the shoe cover  30  is defined between two sidewalls thereof. 
     As shown in  FIG. 2 , each of the dispensing arms  15  further has an outward bending portion  153  extended between the sliding portion  151  and the expanding portion  152  to guide the shoe covers  30  to slide from the sliding portion  151  and the expanding portion  152 . Accordingly, the outward bending portion  153  of each of the dispensing arms  15  is a slanted arm integrally extended from the sliding portion  151  and the expanding portion  152  to gradually increase a distance between the dispensing arms  15 . In other words, when the standby shoe cover  30 A is slid from the sliding portions  151  to the expanding portions  152  through the outward bending portions  153 , the standby shoe cover  30 A will be gradually opened up so as to ensure the smooth sliding movement of the standby shoe cover  30 A for opening up the cover opening  311  of the standby cover body  30 A. 
     Accordingly, the dispensing arms  15  are the components of the dispenser system  10 , wherein when the shoe cover cartridge  20  is coupled at the dispenser system  10 , the guiding arms  41  can be coupled with the dispensing arms  15  respectively. It is worth mentioning that the dispensing arms  15  can be integrally extended from the guiding arms  41  such that the dispensing arms  15  can be configured as a component of the shoe cover cartridge  20  to be loaded into the dispenser system  10  when the shoe cover cartridge  20  is coupled at the dispenser system  10 . In other words, the guiding arms  41  can be extended from the cartridge cavity  11  to the shoe disposing opening  12  after the shoe cover cartridge  20  to be loaded into the dispenser system  10 . 
     The dispenser system  10  comprises a retention unit which comprises first and second stoppers  16 ,  17  spacedly provided at the shoe disposing opening  12  for engaging with the front and rear sides of the standby shoe cover  30 A for retaining the standby shoe body  30 A in an opened condition at the shoe disposing opening  12 . 
     The first stopper  16  is provided close to the free ends the dispensing arms  15  while the second stopper  17  is provided at the expanding portions  152  of the dispensing arms  15  close to the sliding portions  151  thereof. When the standby shoe cover  30 A is pulled at the shoe disposing opening  12 , the front and rear sides of the standby shoe cover  30 A are retained by the first and second stoppers  16 ,  17  respectively to retain the standby shoe cover  30 A in an opened condition at the shoe disposing opening  12 . When the rear side of the standby shoe cover  30 A is pulled to detach from the free ends of the dispensing arms  15 , the subsequent shoe cover  30 B is pulled by the standby shoe cover  30 A that the front and rear sides of the subsequent shoe cover  30 B are retained by the first and second stoppers  16 ,  17  respectively so as to retain the subsequent shoe cover  30 B in an opened condition at the shoe disposing opening  12  after the standby shoe cover  30 A is dispensed. It is worth mentioning that once the rear side of the standby shoe cover  30 A is pulled to detach from the free ends of the dispensing arms  15 , the standby shoe cover  30 A is removed from the dispenser system  10  to wrap at the shoe of the user. 
     According to the preferred embodiment, the first stopper  16  comprises two first stopping members  161  upwardly and integrally protruded from two end portions of the dispensing arms  15  respectively, wherein each of the first stopping members  161  has a stopping surface to block the front side of the standby cover  30 A from moving backward. Preferably, each of the first stopping members  161  has a triangular cross section defining a slanted top surface  163  extended from the dispensing arm  15  and a flat front surface  164  serving as the stopping surface, as shown in  FIG. 2A . Therefore, the front side of the standby shoe cover  30 A can frontwardly slide and pass the slanted top surfaces  163  of the first stopper members  161  at the dispensing direction via the first interlocking holes  321  toward the free front ends of the dispensing arms  15 . Once the first interlocking holes  321  pass the first stopper members  161 , the stopping surfaces of the first stopping members  161  will block the front side of the standby shoe cover  30 A to move backward. 
     According to the preferred embodiment, the second stopper  17  is integrated with the dispensing arms  15 , wherein the outward bending portion  153  of each of the dispensing arms  15  serves as the second stopper  17  to prevent the rear side of the standby shoe cover  30 A moving backward. In other words, when the rear side of the standby shoe cover  30 A is slid at the expanding portions  152  of the dispensing arms  15  through the outward bending portions  153  thereof, the rear side of the standby shoe cover  30 A cannot slide back to the sliding portions  151  of the dispensing arms  15  due to the elasticity of the covering opening  311  of the standby shoe cover  30 A. 
     As shown in  FIG. 2 , the automatic shoe cover dispenser further comprises a pushing feeder  50  supported in the cartridge cavity  11  for pushing the shoe covers  30  toward the shoe disposing opening  12  when the shoe cover cartridge  20  is loaded in the cartridge cavity  11 . According to the preferred embodiment, the pusher feeder  50  comprises two resilient elements, preferably two compression springs, coaxially coupled at the guiding arms  41  respectively for applying a forward pushing force against the stack of the shoe covers  30  toward the shoe disposing opening  12 . Preferably, the resilient elements are coupled at the rear end portions of the guiding arms  41  respectively to push at the rearmost shoe cover  30 . 
     It is worth mentioning that the pusher feeder  50  can be built-in with the shoe cover cartridge  20  that the resilient elements are coupled at the guiding arms  41  respectively. Therefore, the pusher feeder  50  will be replaced when the shoe cover cartridge  20  is unloaded from the dispenser system  10 . Likewise, the pusher feeder  50  can be built-in with the dispenser system  10  that the pusher feeder  50  is supported at the cartridge cavity  11 , such that when the shoe cover cartridge  20  is loaded in the cartridge cavity  11 , the pusher feeder  50  is actuated to push the shoe covers  30  in the shoe cover cartridge  20 . In other words, the pusher feeder  50  will not be replaced during the loading and unloading operation of the shoe cover cartridge  20 . 
     In order to dispense the shoe covers  30  through the dispenser system  10 , the shoe cover cartridge  20  can be loaded into the dispensing system  10  through the rear opening  14  thereof. When the shoe cover cartridge  20  is loaded in the cartridge cavity  11 , the guiding arms  41  are coupled at the dispensing arms  15  end-to-end respectively. Once the shoe cover cartridge  20  is loaded in the cartridge cavity  11 , the shoe cover  30  at the foremost position can be pulled out from the cartridge cavity  11  to the shoe disposing opening  12 , as shown in  FIG. 5 , which serves as the standby shoe cover  30 A. When the standby shoe cover  30 A is pulled to the shoe disposing opening  12  at the position that the first and second stoppers  16 ,  17  are engaged with the front and rear sides of the standby shoe cover  30 A to open up the cover opening  311  of the standby shoe cover  30 A between the front and rear sides thereof. Meanwhile, the cover opening  311  of the standby shoe cover  30 A will also be opened up at the sidewalls thereof via the expanding portions  152  of the dispensing arms  15 . It is worth mentioning that the subsequent shoe cover  30 B is also pulled by the standby shoe cover  30 A, as shown in  FIG. 5 . 
     The user is able to put the foot in the standby shoe cover  30 A through the cover opening  311  thereof that the shoe is located within the standby shoe cover  30 A. Then, the user is able to drag the foot toward the front opening  13  of the dispenser system  10  to detach the standby shoe cover  30 A therefrom. When applying the dragging force to the standby shoe cover  30 A, the first interlocking holes  321  of the standby shoe cover  30 A are slid out of the free ends of the dispensing arms  15  so as to detach the front side of the standby shoe cover  30 A therefrom, as shown in  FIG. 6 . The dragging force at the standby shoe cover  30 A will overcome the holding force at the second stopper  17 , such that the rear side of the standby shoe cover  30 A can be pulled forward. At the same time, the front side of the subsequent shoe cover  30 B is pulled by the rear side of the standby shoe cover  30 A toward the shoe disposing opening  11 . By keep applying the dragging force to the standby shoe cover  30 A, the second interlocking holes  331  of the standby shoe cover  30 A are slid out of the free ends of the dispensing arms  15  so as to detach the rear side of the standby shoe cover  30 A therefrom, as shown in  FIG. 7 . As a result, the standby shoe cover  30 A will be entirely dispensed out of the dispensing arms  15 . The elastic edge of the standby shoe cover  30 A will shrink the cover opening  311  of the standby shoe cover  30 A that the shoe of the user will be wrapped by the standby shoe cover  30 A. 
     Once the rear side of the standby shoe cover  30 A is detached from the dispensing arms  15 , the interlock between the rear side of the standby shoe cover  30 A and the front side of the consequent shoe cover  30 B will be released. Since the dragging force will not be transmitted to the consequent shoe cover  30 B once the standby shoe cover  30 A is dispensed, the rear side of the consequent shoe cover  30 B will be held by the second stopper  17  while the front side of the consequent shoe cover  30 B will be moved back to engage with the dispensing arms  15 . In particular, the first interlocking holes  321  will be engaged with the dispensing arms  15  respectively and will be blocked by the first stopper  16 , as shown in  FIG. 7 . In other words, the consequent shoe cover  30 B will be retained in an opened condition at the shoe disposing opening  12  and will become the standby shoe cover  30 A once the standby shoe cover  30 A is dispensed. 
       FIG. 8  illustrates a first alternative mode of the first and second interlocking units  32 D,  33 D of the shoe cover  30  to interlock the shoe covers  30  with each other via the guiding arms  41 . As shown in  FIG. 8 , the first interlocking unit  32 D comprises two first strips  322 D upwardly extended from two sidewalls of the cover body  31  close to the front side thereof, wherein each of the first strips  322 D has a first interlocking hole  321  provided at a free end thereof. Likewise, the second interlocking unit  33 D comprises two second strips  332 D upwardly extended from two sidewalls of the cover body  31  close to the rear side thereof, wherein each of the second strips  332 D has a second interlocking hole  331 D provided at a free end thereof. The interlocking configuration of the first alternative mode is the same as that of the above mentioned embodiment, wherein the guiding arms  41  are arranged to slidably extend through the first and second interlocking holes  321 D,  331 D at the shoe covers  30 . Therefore, the first interlocking holes  321 D of the subsequent shoe cover  30 B is located in front of the second interlocking hole  331 D of the standby shoe cover  30 A along the guiding arms  41 . It is worth mentioning that the first and second strips  322 D,  332 D can be upwardly extended from the front and rear sides of the cover body  31 . Further, the first and second strips  322 D,  332 D may be respectively a flexible strip. 
       FIG. 9  illustrates a second alternative mode of the first and second interlocking units  32 ,  33 D of the shoe cover  30  to interlock the shoe covers  30  with each other via the guiding arms  41 , wherein the second alternative mode is the combination of the first interlocking unit  32  of the preferred embodiment and the second interlocking unit  33 D of the first alternative mode. As shown in  FIG. 9 , the first interlocking unit  32  contains two spaced apart first interlocking holes  321  formed at the front side of the cover body  31  below the top peripheral edge thereof. Each of the first interlocking holes  321  is a through hole formed at the front side of the cover body  30  close to the sidewall thereof. The second interlocking unit  33 D comprises two second strips  332 D upwardly extended from rear side of the cover body  31 , wherein each of the second strips  332 D has a second interlocking hole  331 D. Further, each of the second strips  332 D may be a flexible strip. 
     The interlocking configuration of the second alternative mode is slightly different from that of the above mentioned embodiment, wherein the guiding arms  41  are arranged to slidably extend through the second interlocking holes  331 D at the shoe covers  30  only, as shown in  FIG. 10 . Accordingly, the second strips  332 D of the standby shoe cover  30 A are extended through the first interlocking holes  321  of the consequent shoe cover  30 B respectively. Once the second strips  332 D of the standby shoe cover  30 A are extended through the first interlocking holes  321  of the consequent shoe cover  30 B, the guiding arms  41  are extended through the second interlocking holes  331 D. It is worth mentioning that the second strips  332 D of the standby shoe cover  30 A not only support the rear side of the standby shoe cover  30 A at the guiding arms  41  but also support the front side of the consequent shoe cover  30 B at the guiding arms  41 . As a result, when the rear side of the standby cover body  30 A is pulled, the front side of the consequent cover body  30 B will be concurrently pulled by the standby cover body  30 A. It is worth mentioning that the guiding arms  41  can be arranged to slidably extend through the first and second interlocking holes  321 ,  331 D at the shoe covers  30  that the first interlocking holes  321  of the subsequent shoe cover  30 B is located in front of the second interlocking hole  331 D of the standby shoe cover  30 A along the guiding arms  41  as the same interlocking configuration as it is mentioned above. 
       FIG. 11  illustrates an alternative mode of the of the automatic shoe cover dispenser as a modification thereof. The dispenser system  10 E has a L-shaped configuration, wherein the cartridge cavity  11 E is formed at a rear top portion of the dispenser system  10 E and the shoe disposing opening  12 E is formed at a front portion of the dispenser system  10 E at a top side thereof. Therefore, the shoe disposing opening  12 E is a top front opening at the front portion of the dispenser system  10 E. The dispenser system  10 E further has a front opening  13 E communicating with the shoe disposing opening  12 E and a top rear opening  14 E communicating with the cartridge cavity  11 E. Therefore, the shoe cover cartridge  20  can be loaded and unloaded in the cartridge cavity  11 E through the shoe disposing opening  12 E. 
     Due to the L-shaped dispenser system  10 E, the guiding arms  41 E are downwardly extended from the cartridge cavity  11 E to the shoe disposing opening  12 E. Each of the guiding arms  41 E has a downward curving portion  411 E extended from the cartridge cavity  11 E and a horizontal portion  412 E extended to the shoe disposing opening  12 E. In other words, the dispensing arms  15  as mentioned above are integrally formed with the guiding arms  41 E to form two integrated arm structures. 
     Accordingly, each of the guiding arms  41 E can be embodied as a wire made of stiff material such as metal. Preferably, the guiding arms  41 E are two flat metal wires extended from the cartridge cavity  11 E to the shoe disposing opening  12 E. Furthermore, the first and second stoppers  16 E,  17 E are spacedly provided at the shoe disposing opening  12 E for engaging with the front and rear sides of the standby shoe cover  30 A for retaining the standby shoe body  30 A in an opened condition at the shoe disposing opening  12 E. 
     Each of the first stoppers  16 E, preferably having a L-shaped configuration, has a resilient portion  161 E extended at the front opening  13 E of the dispenser system  10 E, wherein the resilient portions  16 E of the first stoppers  16 E are arranged for applying a resilient force against the front side of the standby shoe cover  30 A to retain the standby shoe cover  30 A in an opened condition. It is worth mentioning that when the standby shoe cover  30 A is dragged by the user, the dragging force will overcome the resilient force to pull the standby shoe cover  30 A out of the dispenser system  10 E from the front opening  13 E. Preferably, the resilient portions  16 E of the first stoppers  16 E are downwardly, vertically, and spacedly extended between the guiding arms  41 E. 
     The second stopper  17 E comprises a rotatable shaft  171 E rotatably coupled at the dispenser system  10 E and a blocking member  172 E extended from the rotatable shaft  171 E between the guiding arms  41 E for holding the rear side of the standby shoe cover  30 A to retain the standby shoe cover  30 A in an opened condition. Likewise, when the standby shoe cover  30 A is dragged by the user, the dragging force will drive the rotatable shaft  171 E to rotate to disengage the blocking member  172 E with the rear side of the standby shoe cover  30 A so as to pull the standby shoe cover  30 A out of the dispenser system  10 E from the front opening  13 E. Preferably, the rotatable shaft  171 E is supported above the horizontal portion  412 E of the guiding arms  41 E while the blocking member  172 E is downwardly extended from the rotatable shaft  171 E between the horizontal portions  412 E of the guiding arms  41 E. 
     Once the standby shoe cover  30 A is dispensed to release the dragging force transmitted to the subsequent shoe cover  30 B, the rotatable shaft  171 E is rotated back to its original position. Therefore, the blocking member  172 E is engaged with the rear side of the subsequent shoe cover  30 B. At the same time, the front side of the subsequent shoe cover  30 B is held by the resilient portions  16 E of the first stoppers  16 E, such that the subsequent shoe cover  30 B is held at the shoe disposing opening  12 E in an opened condition after the standby shoe cover  30 A is dispensed. 
     Alternatively, each of the first stoppers  16 F, preferably having a conical-shaped configuration, is integrally and radially extended from the corresponding guiding arm  41 F, wherein each of the first stoppers  16 F a slanted circumferential surface  163 F extended from the guiding arm  41 F and a flat front surface  164 F serving as the stopping surface, as shown in  FIG. 13 . The second stopper  17 F comprises a rotatable shaft  171 F rotatably coupled at the dispenser system  10 E and at least one resilient portion  172 F, preferably two spaced apart resilient portions  172 F, extended from the rotatable shaft  171 F for holding the rear side of the standby shoe cover  30 A to retain the standby shoe cover  30 A in an opened condition. 
       FIG. 14  illustrates another alternative mode of the first stopper  16 G provided at the guiding arm  41 G. The first stopper  16 G has a pivot end pivotally extended from the guiding arm  41 G and a free end inclinedly extended from the guiding arm  41 G toward the front opening  13 G. The first stopper  16 G allows the standby shoe cover  30 A to slide at one direction, i.e. the dispensing direction, toward the front opening  13 G. 
       FIG. 15  illustrates another alternative mode of the first stopper  16 H extended to the guiding arm  41 H. The first stopper  16 H is pivotally and inclinedly extended at a position that the free end thereof is extended to contact with the guiding arm  41 H toward the front opening  13 H. The first stopper  16 H allows the standby shoe cover  30 A to slide at one direction, i.e. the dispensing direction, toward the front opening  13 H. 
       FIG. 16  illustrates another alternative mode of the of the automatic shoe cover dispenser. The shoe cover cartridge  20 J further comprises a transverse member  42 J extended from the upper ends of the guiding arms  41 J, wherein the transverse member  42 J is detachably supported by the dispenser system  10 J to retain the guiding arms  41 J in position. Each of the second stoppers  17 J is integrally and radially extended from the corresponding guiding arm  41 J, wherein each of the second stoppers  17 K a front slanted circumferential surface  171 J extended from the guiding arm  41 F, a rear slanted circumferential surface  172 J extended to the guiding arm  41 F toward the front opening  13 J, and a flat circumferential surface  173 J extended between the front and rear slanted circumferential surfaces  171 J,  172 J, which serves as the stopping surface, as shown in  FIG. 16 . 
     The pushing feeder  50 J is supported in the cartridge cavity  11 J for pushing the shoe covers  30  toward the shoe disposing opening  12 J. According to the preferred embodiment, the pusher feeder  50 J comprises an elastic band having two ends detachably secured in the cartridge cavity  11 J for applying a forward pushing force against the stack of the shoe covers  30  toward the shoe disposing opening  12 J. 
       FIG. 17  illustrates an alternative mode of the shoe cover cartridge  20 K for the dispenser system  10 K according to the above preferred embodiment of the present invention, wherein the shoe covers  30 K being manually pulled one-by-one from the dispenser system  10 K. 
     As it is mentioned above, the shoe covers  30 K are overlapped with each other in a sequential manner that the shoe cover at the outermost position is arranged to be pulled into an open-up condition as a standby shoe cover  30 K and a subsequent shoe cover  30 K followed by the standby shoe cover  30 K. The interlocking arrangement between two shoe covers  30 K is the same as the above mentioned embodiment and its alternative modes. Therefore, when the standby shoe cover  30 K is arranged for being pulled, the subsequent shoe cover  30 K is pulled by the standby shoe cover  30 K, so as to dispense the shoe covers  30 K one-by-one in a sequential order. 
     According to the alternative mode, the shoe cover cartridge  20 K further comprises a guiding unit  40 K which comprises two spaced apart elongated guiding arms  41 K extended parallelly with each other. Each of the guiding arms  41 K is a flexible guiding cable retain the shoe covers  30 K in an overlapped manner, wherein the front and rear interlocking units  321 ,  331  are slidably engaged with the guiding arms  41 K at a position that the front interlocking unit  321  at the subsequent shoe cover  30 K is located in front of the rear interlocking unit  331  at the standby shoe cover  30 K along the guiding arms  41 K. Therefore, when the standby shoe cover  30 K is pulled at the dispensing direction, the subsequent shoe cover  30 K is pulled by the standby shoe cover  30 K, so as to dispense the shoe covers  30 K in a sequential order. 
     As shown in  FIG. 17 , the dispenser system  10 K, having a box shape, has a cartridge cavity  11 K and a shoe disposing opening  12 K, wherein the shoe cover cartridge  20 K is stored in the cartridge cavity  11 K. In particular, the shoe covers  30 K are overlapped and stored in the cartridge cavity  11 K at a position that the standby shoe cover  30 K is pulled out of the cartridge cavity  11 K through the shoe disposing opening  12 K. It is worth mentioning that the dispenser system  10 K can be a paper box or a plastic box, wherein the shoe cover cartridge  20 K can be re-filled in the dispenser system  10 K. Therefore, the user is able to manually pull the shoe cover  30 K one-by-one from the dispenser system  10 K. 
       FIG. 18  illustrates a modification of the guiding unit  40 L of the automatic shoe cover dispenser. As it is mentioned above, the shoe covers  30  are overlapped with each other in a sequential manner, wherein each of the shoe covers  30  comprises the cover body  31  having a cover opening  311 , the front interlocking unit  32  provided at the front side of the cover body  31 , and the rear interlocking unit  33  provided at the rear side of cover body  31 . 
     Accordingly, the guiding unit  40 L comprises two spaced apart elongated guiding arms  41 L extended parallelly with each other. Accordingly, the front and rear interlocking units  32 ,  33  are slidably engaged with the guiding arms  41 L at a position that the front interlocking unit  321  at the subsequent shoe cover  30 B is located in front of the rear interlocking unit  331  at the standby shoe cover  30 A along the guiding arms  41 L, such that when the standby shoe cover  30 A is pulled to the shoe disposing opening  12  at the dispensing direction, the subsequent shoe cover  30 B is pulled by the standby shoe cover  30 A from the cartridge cavity  11 , so as to dispense the shoe covers  30  in a sequential order. 
     In one embodiment, the guiding arms  41 L extend through all the first and second interlocking holes  321 ,  331  of the shoe covers  30 A,  30 B,  30 C. In particular, the guiding arms  41 L are arranged to slidably extend through the first interlocking holes  321  at the front side of the standby shoe cover  30 A such that the front side of the standby shoe cover  30 A is located at the foremost position to be pulled firstly. The guiding arms  41 L are arranged to slidably extend through the second interlocking holes  331  at the rear side of the standby shoe cover  30 A such that the standby cover shoe  30 A is slidably supported at the guiding arms  41 L. Likewise, the guiding arms  41 L are arranged to slidably extend through the first and second interlocking holes  321 ,  331  of the subsequent shoe cover  30 B and the third shoe cover  30 C such that the subsequent shoe cover  30 B and the third shoe cover  30 C are slidably supported at the guiding arms  41 L. In other words, the shoe covers  30  are packed and held by the guiding arms  41 L before the shoe covers  30  are loaded in the dispenser system  10 . 
     In this modification, each of the guiding arms  41 L has an elongated straight tubular shape to serve as a detachable guiding tube having an inner diameter larger than an outer diameter of each of the dispensing arms  15  of the dispenser system  10 . Furthermore, a distance between the guiding arms  41 L matches with a distance between the dispensing arms  15 , such that the dispensing arms  15  are slidably inserted into the guiding arms  41 L respectively in order to load the shoe covers  30  in the cartridge cavity  11 , as shown in  FIG. 19 . 
     It is worth mentioning that each of the dispensing arms  15  has the sliding portion  151 , the expanding portion  152 , and the outward bending portion  153  extended between the sliding portion  151  and the expanding portion  152  to guide the shoe covers  30  to slide from the sliding portion  151  and the expanding portion  152 . The distance between the guiding arms  41 L matches with a distance between the sliding portions  151  of the dispensing arms  15 , such that the sliding portions  151  of the dispensing arms  15  are slidably inserted into the guiding arms  41 L from the rear ends of the dispensing arms  15  at the loading direction. It is worth mentioning that the sliding portion  151  of the dispensing arm  15  can be prolonged its length to match with the length of the guiding arm  41 L. Preferably, the length of the guiding arm  41 L is longer than the length of the sliding portion  151  of the dispensing arm  15 . 
     Once the sliding portions  151  of the dispensing arms  15  are slidably inserted into the guiding arms  41 L, the shoe covers  30  are loaded in the dispenser system  10  at a position that the shoe covers  30  are held by the sliding portions  151  of the dispensing arms  15 . Then, the guiding arms  41 L are detached from the sliding portions  151  of the dispensing arms  15  by sliding the guiding arms  41 L at the unloading direction which is opposite to the loading direction, as shown in  FIG. 19 . Therefore, the guiding arms  41 L are slid of the rear ends of the dispensing arms  15  to detach the shoe covers  30  from the guiding arms  41 L while the shoe covers  30  are retained at the sliding portions  151  of the dispensing arms  15 . It is worth mentioning that when at least a portion of the guiding arm  41 L is coaxially coupled with the dispensing arm  15 , i.e. the rear end of the dispensing arm  15  is slidably inserted into an end portion of the guiding arm  41 L, the shoe covers  30  are guided by the guiding arms  41 L and the dispensing arms  15 . Therefore, the shoe covers  30  can be pushed to unload from the guiding arms  41 L and to load at the dispensing arms  15 . Preferably, the entire guiding arm  41 L is coaxially coupled with the dispensing arm  15  by fully inserting the dispensing arm  15  into the guiding arm  41 L, such that the guiding arms  41 L can be pulled out from the dispensing arms  15  easily and the shoe covers  30  are guaranteed to be retained at the dispensing arms  15  for being loaded at the dispenser system  10 . 
     Once the shoe covers  30  are loaded in the dispenser system  10 , the standby shoe cover  30 A is slid at the expanding portions  152  of the dispensing arms  15 , such that the cover opening  311  of the standby cover body  30 A is expanded to open up the standby cover body  30 A. It is worth mentioning that the guiding arms  41 L are optionally detached from the sliding portions  151  of the dispensing arms  15 , wherein the standby shoe cover  30 A can still be slid at the expanding portions  152  of the dispensing arms  15  even the guiding arms  41 L are remained at the sliding portions  151  of the dispensing arms  15 . However, for enhancing the smooth sliding movement of the shoe covers  30  along the dispensing arms  15 , it is preferred to remove the guiding arms  41 L from the dispensing arms  15  after the shoe covers  30  are loaded and held at the dispensing arms  15 . 
     It is appreciated that the guiding arms  41 L can be incorporated with the first and second interlocking units  32 ,  33  and their alternatives. In other words, the guiding arms  41 L can be slidably extended through the first and second interlocking holes  321 ,  331  or the first and second interlocking holes  321 D,  331 D in  FIGS. 8 and 9 . In addition, the guiding arms  41 L can also be incorporated with the dispenser system  10  and its alternatives in  FIG. 11  as long as the dispensing arms  15  can be slidably inserted into the guiding arms  41 L. 
     Therefore, the loading operation of the shoe covers  30  into the dispenser system  10  can be simplified by simply slid the guiding arms  41 L to the dispensing arms  15  respectively in order to coaxially receive the dispensing arms  15  within the guiding arms  41 L respectively. The user is able to hold the shoe covers  30  and to apply a pulling force at each of the guiding arms  41 L in order to slidably pull the guiding arms  41 L out of the dispensing arms  15  while the shoe covers  30  are remained being held at the dispensing arms  41 L. Then, the loading operation of the shoe covers  30  into the dispensing system  10  is completed. 
     One skilled in the art will understand that the embodiment of the present invention as shown in the drawings and described above is exemplary only and not intended to be limiting. 
     It will thus be seen that the objects of the present invention have been fully and effectively accomplished. The embodiments have been shown and described for the purposes of illustrating the functional and structural principles of the present invention and is subject to change without departure from such principles. Therefore, this invention includes all modifications encompassed within the spirit and scope of the following claims.