Abstract:
The present invention relates to an article elevator for moving lightweight open ended containers from a first level to a second level vertically spaced from the first level. The article elevator includes an input section at the first level for receiving container bodies. An elevator section is positioned for receiving container bodies from the input section. A discharge section is located at the second level for receiving container bodies from the elevator section. A plurality of arms is movably mounted above the input section, the elevator section, and the discharge section. Each of the arms moves a group of container bodies from the input section over the elevator section to the discharge section so that successive groups of container bodies are moved to the discharge section from the input section.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    Cans which are used as closed vessels for containing soft drinks, water, beer, and the like are typically made of a container body which is a unitary drawn open ended body. A top is sealingly mounted on the open end of the body to complete the can. The top contains an apparatus for opening the can to access the contents thereof. The container body is generally made of an easily drawable material such as an aluminum alloy. Typically a slug is stamped out of the aluminum alloy sheet. The slug is positioned over a mandrel and the slug is then drawn on the mandrel utilizing oil and water as a lubricant in the drawing process to produce a lightweight unitary body. Once the body is formed, the body is cut at the open end to insure that all of the container bodies have a uniform height for the packaging process and the addition of the top. Inasmuch as the bodies are drawn with oil and water used as a lubricant, the formed bodies must be washed to clean the bodies to make them acceptable for receipt of products to be consumed by humans. The washers for the formed bodies are located at a raised location in typical can operation. An ordinary distance from the site for formation of the bodies to the washer is approximately 24 feet requiring the bodies to be raised to the washer. The apparatus heretofore used for raising the bodies is a vacuum system. The bodies with the closed end uppermost are moved to a conveyor where air pressure is reduced so that the closed ends of the container bodies are held onto the conveyor. The conveyor raises the container bodies to the washer. Inasmuch as a normal production of container bodies may be approximately 1,600 container bodies per minute, it is apparent that the container bodies must move quickly and a large quantity of air is required to hold the container bodies onto the conveyor. 
         [0002]    The flow of air which holds the container bodies onto the conveyor also removes lubricating oil and water from the container bodies. A separate air treating system is required to collect the oil and water rather than discharge the oil and water into the atmosphere. The capital cost of the air treating system and the operation of the necessary blowers for the conveyor and the air treating system is expensive, in that, they consume a considerable amount of energy in the operation of all of the air handling equipment. 
       SUMMARY OF THE INVENTION 
       [0003]    The present invention is an improved article elevator. The elevator is particularly adapted to handle unitary open ended lightweight container bodies used in the manufacture of cans. The container bodies are raised from a first level to a vertically spaced second level. The first level has an input section for receiving lightweight container bodies. The elevator includes an elevator section having an elevator input end for receiving lightweight container bodies from the input section. The elevator includes a discharge section at the second level for receiving lightweight container bodies from the elevator section. A plurality of first arms is movable above the input section, the elevator section, and the discharge section to move successive groups of lightweight container bodies from the input section over the elevator section to the discharge section. Each of the arms moves a group of container bodies thereby successive groups of lightweight container bodies are moved from the input section over the elevator section to the discharge section to effect a change of elevation for the lightweight container bodies from the first level to the second level. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0004]      FIG. 1  is a perspective view of a container body elevator embodying the herein disclosed invention for raising lightweight container bodies from a first level to a second higher level; 
           [0005]      FIG. 2  is a side elevational view of the container body elevator shown in  FIG. 1  showing the difference in heights from a first level to a second level; 
           [0006]      FIG. 3  is a top view of the container body elevator shown in  FIG. 1  showing groups of containers in separate pockets; 
           [0007]      FIG. 4  is an end view of the container body elevator shown in  FIG. 1  showing groups of containers in pockets moved on an elevator section of the elevator; 
           [0008]      FIG. 5  is an enlarged top view of a pocket formed by a pair of push arms with an assembly of container bodies held in the pocket; 
           [0009]      FIG. 6  is a cross sectional view taken on Line  6 - 6  of  FIG. 8  showing converging arms before completing a pocket and a drip pan for collecting lubricant dropped off the container bodies; 
           [0010]      FIG. 7  is a cross sectional view taken on Line  7 - 7  of  FIG. 8  similar to  FIG. 6 , but showing a pair of arms forming a complete pocket; 
           [0011]      FIG. 8  is an enlarged top view of an input section of the container body elevator showing push arms being moved into a group of container bodies to form pockets for holding the container bodies in a stabilized attitude as the bodies are moved through the elevator system from the first level to the second level; 
           [0012]      FIG. 9  is an enlarged perspective view of a portion of the elevator showing pockets of container bodies moving from an input section to an elevator section; 
           [0013]      FIG. 10  is an enlarged top view of the elevator showing a discharge section wherein the arms are moved away from the container bodies to allow the container bodies to be discharged from the elevator after being raised from the first level to the second level; and 
           [0014]      FIG. 11  is a cross sectional view of the elevator through a transition portion from the input section to the elevator section. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
       [0015]    Referring now to the drawings, and especially to  FIG. 1 , an article elevator which is a specific embodiment of the present invention is shown therein and is generally identified by the numeral  20 . Article elevator  20 , in this instance, is used to handle conventional lightweight drawn open ended aluminum alloy container bodies  22 . Each container body  22  has an identical construction to each other container body. Each container body  22  has a right circular cylindrical sidewall  24  with an integrally formed bottom  26  and an open end opposite the bottom. The instant container body is a conventional and well known construction for use as a main body of a conventional and well known metal can which is ubiquitous throughout the country. The present elevator handles the container bodies with the bodies oriented in an attitude wherein the open end of each body is on the support for each body, as shown in  FIG. 11 . The orientation of the bodies allows lubricant used in the drawing process and residually carried by the bodies to run out of the bodies during the elevating process, thereby reducing the amount of residue required to be removed by a washing process. 
         [0016]    Article elevator  20  includes a frame  28  with an input section  30  positioned at one end of the frame. An elevator section  32  is mounted on the frame with one end positioned adjacent to the input section. A discharge section  34  is also mounted on the frame and is positioned adjacent to another end of the elevator section. The discharge section, in this instance, is at a level twenty-four feet above the level of the input section. A drip pan  36  is mounted on the frame and extends the length of the frame beneath the input section, the elevator section, and the discharge section. The article elevator raises groups of open ended container bodies  22  from the input section to the discharge section where the bodies are discharged from the article elevator. 
         [0017]    Frame  28  includes base sides  37  and  38  which have input section  30  secured thereto. Elevator supports  40  and  42  are connected to base sides  37  and  38 , respectively. Elevator section  32  is attached to elevator supports and  40  and  42 . Discharge section  34  is mounted on discharge beams  44  and  46  which are secured at their respective end to supports  40  and  42 , respectively. Uprights  48  in cooperation with cross member  50  provide stability to frame  28 . 
         [0018]    Input section  30  includes a movable horizontal input surface specifically a conventional apertured conveyor input belt  52  which is driven by a conventional controlled source of power. The input section receives container bodies from one or more conventional body forming machines (not shown). A pair of parallel guide rails  54  and  56  keep container bodies  22  on the conveyor input belt when received from the forming machines. Bodies  22 , as mentioned above, are each formed from a slug of aluminum alloy and drawn over a mandrel to form a unitary container body. Oil and water are used as lubricants during the forming process so that each of the container bodies arrives at the input section with some residue of oil and water on each body. The bodies are positioned on input belt  52  with the open ends of the bodies adjacent to the belt. The oil and water tend to run down the bodies to the belt. The apertures in the belt allow the oil and water to pass through the belt to the drip pan. The input belt  52  has its upper surface in a horizontal plane which forms a first level. The input belt extends to a lower apertured transfer conveyor belt  58  for carrying container bodies from the input section to the elevator section. Transfer belt  58  is driven by a conventional controlled power source at a rate comparable to the speed of the input belt so that there is a smooth transition by the container bodies from the input belt to transfer belt  58 . 
         [0019]    The elevator section has a movable elevator surface specifically a conventional apertured conveyor elevator belt  60  driven by a conventional controlled power source. Elevator belt  60  is driven at a speed comparable with the speed of transfer belt  58  to have a smooth transfer of container bodies to the input end of the elevator section. The elevator belt is set at an angle of 110° to the upper horizontal surface of input belt  52 . The angle of the elevator belt allows for maximum amount of vertical lift of the container bodies for the minimum amount of utilized horizontal space, but in keeping with the requirement to maintain the attitude of the bodies in an upright position relative to the belts. The elevator conveyor belt has a discharge end positioned adjacent to one end of an apertured upper transfer conveyor belt  62  which is driven by a conventional controlled power source. Transfer belt  62  is driven at a rate to receive container bodies from the elevator belt. The discharge section has a movable horizontal discharge surface specifically an apertured discharge conveyor belt  64 . Belt  64  has one end positioned adjacent to the upper transfer belt to receive container bodies from the upper transfer belt. The discharge belt is driven by a conventional controlled source of power at a speed greater than the speed of the upper transfer belt and effectively faster than all the belt carrying the container bodies including the input belt. Discharge conveyor belt  64  has its upper surface in a horizontal plane parallel to the upper surface of input belt  52 . 
         [0020]    A first arm conveyor  66  is mounted on one side of the input section, the elevator section, and the discharge section. A mirror image second arm conveyor belt  68  is mounted on the other side of the input section, elevator section, and discharge section. The first arm conveyor  66  includes a chain belt  70  with a plurality of identical first arms  72  mounted thereon. Each of the first arms is extendable successively over the input section, the elevator section, and the discharge section to the middle of each section and then return to the input section. The second arm conveyor belt includes a like conventional chain conveyor  74  with a plurality of identical second arms  76  mounted thereon. In a like manner to the first arm, end of the second arms  76  is extendable successively over the input section, the elevator section, and the discharge section to the middle of each section and then return to the input section. 
         [0021]    As may be best seen in  FIG. 8 , the first and second arm conveyor belts converge over the input section. The first and second arms are positioned adjacent to each other at their outer most ends after the conveyors converge to form conveyor arms forming pockets  78  for receiving a group of container bodies in each of the pockets. Each of the pockets with container bodies in the respective pocket is moved up the elevator section to the discharge section where the first and second arm conveyors diverge, as shown in  FIGS. 3 and 10 . 
         [0022]    The container bodies are delivered to the input belt of the input section from the forming machines (not shown). The container bodies are typically delivered at the rate of 1,600 container bodies per minute. The container bodies are loaded onto the input belt with the open end of each of the container bodies extending downward, that is, adjacent to the inlet belt so that residue of the oil and water lubricants may flow off the container bodies and to the apertured belt which allows the lubricants to flow through the belt to the drip pan. The drip pan has an input portion  80  below the input section, an elevator portion  82  adjacent to the elevator section, and a discharge portion  84  below the discharge section. The lubricant which comes off the container bodies while the bodies are on the elevator passes through the apertured belts and is collected in the drip pan for disposal. The first and second arms converge over the input section, as may be best seen in  FIGS. 3 and 8 . Each pair of juxtaposed ends of the first and second arms forms a pocket  78 . The container bodies are delivered in sufficient numbers to substantially fill each pocket with container bodies so that there is a massed assembly of container bodies. The successive pockets with the container bodies are moved to the elevator section. The pockets with the container bodies move up the elevator section to the level of the discharge section. At the discharge section, the arms diverge, as shown in  FIGS. 3 and 10 , to allow the container bodies to be carried away by the discharge belt. The speed of the discharge belt is greater than the speed of the other belts of the elevator including the input belt of the input conveyor and the speed of the first and second arm conveyor so that the container bodies clear the arms and are carried away for further processing. Typically, the container bodies are delivered to a washer (not shown) for washing the container bodies to make the bodies acceptable for receipt of products for human consumption. 
         [0023]    The pockets carrying the container bodies are substantially filled with the container bodies adjacent to the first and second arms to keep the container bodies upright during the transfer from the lower level to the upper level. A scanner  86  is mounted above the input section to determine the density of the mass of numbers of the container bodies entering the input section. The scanner is connected to a motor control  88  which regulates the rate of movement of all of the belts and the first arm and second arm conveyors. The control regulates the speed of the belts and first and second arm conveyors to keep enough container bodies in the input section so that each of the successive pockets formed by first and second arms is filled, but the input section is not overloaded. Thus, the filled pockets prevents the container bodies from falling over, but rather in an upright attitude from the input section to the discharge section and the container bodies are delivered from the elevator in an upright attitude for further processing. 
         [0024]    Although the invention has been described in detail above, it is readily apparent that those skilled in the art may make various modifications and changes in the instant invention without departing from the spirit and scope of the present invention. It is to be expressly understood that the instant invention is limited only by the appended claims.