Abstract:
A gate valve for positioning in the open upper end of a grain bin below the lid thereof which closes the open upper end of the grain bin. The gate valve permits grain to pass downwardly therethrough but which prevents warm moist air from the grain bin from passing upwardly therethrough into a grain spout or deadhead box.

Description:
BACKGROUND OF THE INVENTION 
     Field of the Invention 
     This invention relates to a gate valve for use in the upper end of a grain bin and more particularly to a gate valve for use in the upper end of a grain bin which prevents warm moist air from passing upwardly through the upper end of the grain bin into a grain discharge spout which is in communication with a source of grain. 
     Description of the Related Art 
     Many types of grain distribution systems have been previously provided wherein a plurality of grain bins are fairly closely positioned to one another with a grain distributor or the like supplying grain to each of those grain bins. Usually, a grain discharge spout extends from the grain distributor to each of the grain bins with the discharge end of each of the spouts being in communication with the open upper end of the grain bin to supply grain to the bin. In many cases, the lower end of the spouts have an adjustable deadhead box secured thereto which is in communication with the open upper end of the bin. In those cases where the grain bin is of the dryer type or the aerator type, air is forced upwardly through the grain in the bin. Most of the grain bins have vents formed in the roofs thereof through which warm moist air from the grain in the bin passes outwardly and upwardly therefrom. However, a portion of the warm moist exhaust air is also directed upwardly into the discharge end of the grain discharge spout or the adjustable deadhead box. Due to the fact that warm air has a higher moisture holding capacity than cool air, the warm moist air that the aeration fan of the bin pushes upwardly out of the grain, some of the warm moist air passes outwardly through vents in the roof of the bin and some passes through the hole in the lid of the bin. When the warm moist air passes upwardly through the cool discharge spout, water condenses on the inside of the discharge spout. The condensed water on the inside of the discharge spout drips downwardly from the discharge spout into the center of the grain bin thereby causing the grain in the center of the bin to spoil. Further, the water dripping downwardly from the discharge spout can migrate down to the bottom of the bin thereby causing the center well to have spoiled grain to plug the center well or to ice up if the grain is unloaded in freezing conditions. 
     SUMMARY OF THE INVENTION 
     This Summary is provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description. This Summary is not intended to identify key aspects or essential aspects of the claimed subject matter. Moreover, this Summary is not intended for use as an aid in determining the scope of the claimed subject matter. 
     A gate valve is disclosed for use with a grain bin having a grain inlet opening at its upper end which has a lid extending over the grain inlet opening. The lid has an opening formed therein which is in communication with a grain discharge spout or deadhead box with the grain discharge spout or deadhead box being in communication with a source of grain from a grain distributor or the like. The gate valve of this invention includes a hollow housing having an open upper end, an open lower end, and an interior. The housing is secured to and is positioned at the lower side of the lid whereby the open upper end of the housing is in communication with the opening in the lid. A valve assembly is mounted on the housing at the lower open end thereof which is movable between a normally closed position and an open position. The valve assembly closes the open lower end of the housing when in its normally closed position to prevent warm moist air from passing upwardly from the grain in the grain bin into the grain discharge spout. The valve assembly is moved from its normally closed position to its open position upon grain passing downwardly from the grain discharge spout or deadhead box into the housing and which comes into contact with the valve assembly. 
     It is therefore a principal object of the invention to provide a gate valve for use with a grain bin which prevents warm moist air from passing upwardly from the bin into a grain discharge spout. 
     A further object of the invention is to provide a gate valve of the type described which is easily secured to an existing lid of a grain bin. 
     A further object of the invention is to provide a gate valve of the type described which is in an open position when grain is being discharged into the grain bin and which is closed when grain is not being discharged into the grain bin to prevent warm moist air from the grain bin from passing upwardly into a grain discharge spout or deadhead box. 
     These and other objects will be apparent to those skilled in the art. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Non-limiting and non-exhaustive embodiments of the present invention are described with reference to the following figures, wherein like reference numerals refer to like parts throughout the various views unless otherwise specified. 
         FIG. 1  is a partial perspective view of a grain distribution system which delivers grain into a grain dryer bin; 
         FIG. 2  is a perspective view of the gate valve of this invention; 
         FIG. 3  is an exploded perspective view of the gate valve of this invention; 
         FIG. 4  is a partial sectional view illustrating the gate valve of this invention mounted in the upper end of a grain dryer bin with the broken lines illustrating the valve assembly of this invention in an open position; 
         FIG. 5  is a side view of the valve assembly of this invention in an open position with a portion of the grain dryer bin cut away to more fully illustrate the invention; and 
         FIG. 6  is a side view similar to  FIG. 5  except that the valve assembly is in a closed position. 
     
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Embodiments are described more fully below with reference to the accompanying figures, which form a part hereof and show, by way of illustration, specific exemplary embodiments. These embodiments are disclosed in sufficient detail to enable those skilled in the art to practice the invention. However, embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. The following detailed description is, therefore, not to be taken in a limiting sense in that the scope of the present invention is defined only by the appended claims. 
     The numeral  10  refers to a conventional grain storage facility which includes one or more grain bins  12 , each of which has an open upper end  14  which is normally closed by a lid or cover  16 . The grain bin may be a dryer bin, an aerator bin or a conventional bin. Lid  16  includes an opening  18  formed therein which is usually centrally positioned in lid  16 . A flanged connector  20  is secured to the upper side of lid  16  and which has an opening  22  formed therein which communicates with opening  18  in lid  16 . The roof of the bin  12  has a plurality of air vent members  23  formed therein. The numeral  24  refers to a conventional grain discharge spout which extends from a conventional grain distributor  26  which is in communication with a source of grain. The discharge end of spout  24  usually is in communication with an adjustable deadhead box  25  which is in communication with the opening  22  in flange connector  20  and is secured to the flange connector  20  in conventional fashion. In some cases, the deadhead box  25  is not utilized. In those situations, the discharge end of the spout  24  is in communication with the opening  22 . 
     The numeral  28  refers to the gate valve apparatus of this invention. Gate valve  28  includes a hollow housing  30  which has an open upper end  32  and an open lower end  34 . Housing  30  may have a square cross-section, a rectangular cross-section or a cylindrical configuration. 
     The upper end  32  of housing  30  is bolted or otherwise secured to the underside of lid  16  by bolts  35  so that the interior of housing  30  is in communication with opening  18  of lid  16 . For purposes of description, housing  30  will be described as having side walls  36 ,  38 ,  40  and  42 . 
     A horizontally disposed pivot shaft or rod  44  is pivotally mounted in brackets  46  and  48  which are welded to the outer side of side wall  36  of housing  30 . Plate member  50  has its inner end welded to shaft  44  outwardly of bracket  46 . A heavy counter-weight  52 , comprised of metal such as iron, steel or lead, is secured to the outer end of plate member  50  by bolt  53 . One end of arm or plate  54  is welded or otherwise secured to shaft  44  between brackets  46  and  48 . The other end of plate  54  is secured to a rectangular valve member  56  by welding. Valve member  56  will be described as having an inner side  58  and an outer side  60 . A wear resistant plate member  62  comprised of plastic or the like is positioned at the inner side  58  of valve member  56  and is secured to valve member  56  thereto by bolts  64 . 
     Valve member  56  is pivotally movable between a normally closed position and an open position. The counter-weight  52  yieldably maintains valve member  56  in its closed position. When in its closed position of  FIG. 4 , valve member  56  closes one-half of the open lower end  34  of housing  30 . 
     A horizontally disposed pivot shaft or rod  44 ′ is pivotally mounted in brackets  46 ′ and  48 ′ which are welded to the outer side of side wall  40  of housing  30 . Plate member  50 ′ has its inner end welded to shaft  44 ′ outwardly of bracket  46 ′. A heavy counter-weight  52 ′, comprised of metal such as iron, steel or lead, is secured to the outer end of plate member  50 ′ by bolt  53 ′. One end of arm or plate  54 ′ is welded or otherwise secured to shaft  44 ′ between brackets  46 ′ and  48 ′. The other end of plate  54 ′ is secured to a rectangular valve member  56 ′ by welding. Valve member  56 ′ will be described as having an inner side  58 ′ and an outer side  60 ′. A wear resistant plate member  62 ′ comprised of plastic or the like is positioned at the inner side  58 ′ of valve member  56 ′ and is secured to valve member  56 ′ by bolts  64 ′. 
     Valve member  56 ′ is pivotally movable between a normally closed position and an open position. The counter-weight  52 ′ yieldably maintains valve member  56 ′ in its closed position. When in its closed position, valve member  56 ′ closes one-half of the open lower end  34  of housing  30 . 
     The valve members  56  and  56 ′ will be in their normally closed positions of  FIG. 4  due to the counter-weights  52  and  52 ′ unless grain is being delivered to the bin  12 . When in their closed positions, the valve members  56  and  56 ′ prevent warm moist air from passing upwardly from the interior of the grain bin  12  into the grain discharge spout  24  or the adjustable deadhead box  25 . The closure of the valve members  56  and  56 ′ prevents the warm moist air from condensing on the inside of the box  25  or the discharge spout  24 . When grain is being delivered to the bin  12  by the spout  24  or the deadhead box  25 , as seen in  FIG. 5 , the weight of the incoming grain impinges on the valve members  56  and  56 ′ to pivotally move the valve members  56  and  56 ′ to their open positions against the forces of the counter-weights  52  and  52 ′. As soon as the flow of grain is halted, the valve members  56  and  56 ′ are moved to their closed positions by the counter-weights  52  and  52 ′. The valve members  56  and  56 ′, when in their closed positions of  FIG. 6 , prevent the warm moist air passing upwardly from the grain in bin  12  from passing into the interior of the deadhead box  25  or the spout  24  as previously described. 
     Although it is preferred that the valve members  56  and  56 ′ are yieldably maintained in their closed positions by the counter-weights  52  and  52 ′, the counter-weights  52  and  52 ′ could be replaced by torsion springs or the like. 
     Although it is preferred that the gate valve apparatus  28  of this invention be secured to the lid  16 , it is possible that the apparatus  28  could be separated from lid  16  and held in position below the lid  16  below the opening  18  by suitable supporting structure. 
     Thus it can be seen that the invention accomplishes at least all of its stated objectives. 
     Although the invention has been described in language that is specific to certain structures and methodological steps, it is to be understood that the invention defined in the appended claims is not necessarily limited to the specific structures and/or steps described. Rather, the specific aspects and steps are described as forms of implementing the claimed invention. Since many embodiments of the invention can be practiced without departing from the spirit and scope of the invention, the invention resides in the claims hereinafter appended.