Patent Publication Number: US-7591396-B2

Title: Restrictor and dispensing system

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation-in-part of U.S. Ser. No. 11/140,342 entitled “Sheet Material Dispenser” to Lewis et al., filed May 27, 2005, now U.S. Pat. No. 7,428,978 which is hereby incorporated by reference herein for all purposes. 
    
    
     BACKGROUND 
     Sheet materials, such as, but not by way of limitation, wipers stacked in a generally aligned configuration, are used for certain “clean” applications such as surgical rooms, electronic manufacturing, automotive painting and finishing, aerospace applications, and the like. Critical applications, such as procedures in clean rooms where silicone wafers are prepared to produce materials and/or apparatus such as integrated circuit devices, computer hard drives and the like make the use of wound sheet materials or interfolded sheet materials undesirable to use. Wound and/or interfolded sheet materials can result in linting, that is, shedding of small particles which can ultimately contaminate delicate silicone products. Wipers or sheet material for these clean applications must be “lint free” and are generally produced as individual sheets with their edges sealed normally by thermal or laser means. These wipers are usually sold in a stack of wipers which are not interfolded, and which are either dry or premoistened, generally, but not by way of limitation, with an isopropyl alcohol (IPA). Moistening may cause one or more wipers in the stack to cling together, making the separation of one wiper from the stack by an individual wearing gloves very difficult. However, it is desirable to dispense one wipe or sheet at a time, particularly in a clean room setting. 
     To address this problem, wipers have been wadded or otherwise packaged as a plurality of individual wipers packaged in pouches or pails. Pouches generally have a tabbed opening which is sealed with a resealable adhesive flap. Such adhesives often lose their ability to seal once they are wetted with an IPA or other liquid, and the wipers dry out. Pails employ a lid that can be difficult to remove and/or which often is not adequately sealed after use, allowing the alcohol to evaporate and the wipers to again dry out. Further, use of a pouch or pail requires a user to hold the pouch or pail with one hand and withdraw the wiper with the other hand. 
     It would be desirable for ergonomic, production efficiency and cost-in-use to provide a dispenser which would dispense one premoistened or dry wiper at a time. Such a dispenser may desirably more easily dispense one wiper to a user. 
     Further, since the edges of the sheets or wipers are heat or laser sealed to reduce or eliminate lint, the edges may be somewhat irregular. When one wiper is moved or slid across the others in the stack, the irregularities on the edge may cause the wiper to snag or catch another wiper and drag it partially or completely out during dispensing of the stacked wipers, resulting in waste. 
     To reduce or eliminate such waste, it would be desirable to provide a restrictor, such as a weighted plate, which is provided on the top of such a stack. Such a restrictor is desirably configured to allow for easy dispensing of one wiper at a time, while providing weight to at least a portion of the stack to prevent excessive dispensing from a top sheet being withdrawn snagging or moving one or more sheets below it when the top sheet is being dispensed. 
     Such a dispensing system may use a restrictor with a dispenser. Alternatively, such a dispensing system may use a restrictor in conjunction with a cartridge holding the stack of sheet materials which is configured to be disposed in the dispenser. 
     DEFINITIONS 
     As used herein, the term “exit port” or “dispensing port” is the opening in a housing of a dispenser for the passage of sheet material out of the dispenser. 
     As used herein, the terms “sheet material”, “sheet materials”, “wiper” “wipes” and “wipers” are interchangeable, and mean a material that is thin in comparison to its length and breadth. Generally speaking, sheet materials should exhibit a relatively flat planar configuration and be flexible to permit folding, rolling, stacking, and the like. Exemplary sheet materials include, but are not limited to, woven natural and/or synthetic material, nonwoven natural and/or synthetic material, cellulosic materials, such as, for example, paper tissue, paper towels, and so forth, or other fibrous material(s), film, polymers, filamentary products, and so forth. 
     As used herein, the term “fasteners” means devices that fasten, join, connect, secure, hold, or clamp components together. Fasteners include, but are not limited to, screws, nuts and bolts, rivets, snap-fits, tacks, nails, loop fasteners, and interlocking male/female connectors, such as fishhook connectors, a fish hook connector includes a male portion with a protrusion on its circumference. Inserting the male portion into the female portion substantially permanently locks the two portions together. 
     As used herein, the term “hinge” refers to a jointed or flexible device that connects and permits pivoting or turning of a part to a stationary component. Hinges include, but are not limited to, metal pivotable connectors, such as those used to fasten a door to frame, integrally molded ball and socket type, circular openings in components joined with a hinge pin and living hinges. Living hinges may be constructed from plastic and formed integrally between two members. A living hinge permits pivotable movement of one member in relation to another integrally connected member. 
     As used herein, the term “couple” includes, but is not limited to, joining, connecting, fastening, linking, or associating two things integrally or interstitially together. 
     As used herein, the terms “configure”, “configured” and/or “configuration” means to design, arrange, set up, or shape with a view to specific applications or uses. For example: a military vehicle that was configured for rough terrain; configured the computer by setting the system&#39;s parameters. 
     As used herein, the term “sheet mover” refers to a portion of the pivotal leg which is used to move one or a few sheet materials away from a stack or plurality of sheet materials. Specifically, the embodiments shown herein include a toe of the pivotal let having a pick which has at least one tooth thereon. In addition, the embodiments shown herein include a portion of the toe which ruffles or bunches one or a few sheet materials away from a stack or plurality of sheet material. These embodiments are intended to be non-limiting, and other embodiments which create the movement of sheet material, either by snagging or grabbing the sheet material, or, alternatively, by ruffling or bunching the sheet material may be used. 
     As used herein, the term “pick” refers to a sharp or semi-sharp, generally pointed instrument, in this instance, the pick, and desirably, one or more teeth of the pick, which is used to pierce, make a small hole in, snag without piercing, grab or drag by means of friction a sheet material. 
     As used herein, the term “pusher” refers to an instrument, in this instance, at least a portion of the pivotal leg, and desirably the toe of the pivotal leg, which acts to ruffle, wrinkle or bunch a portion of one or a few sheet materials away from a stack or plurality of sheet materials. 
     As used herein, the terms “snag” or “grab” refers to contacting a thing, such as a portion of one or more sheet materials, and seizing and pulling the contacted portion of the sheet material. 
     As used herein, the terms “push”, “bunch” “ruffle” and/or “wrinkle” refers to contacting and applying pressure to something, such as a portion of one or a few sheet materials, thereby creating a small furrow, ridge, hill or crease on a normally smooth surface for the purpose of moving the portion of the one or a few sheet materials. 
     As used herein, the term “about” includes plus or minus 10 percent of the numeral of a stated, implied or inherent amount at each end of a range. 
     As used herein, the term “substantially” refers to something which is done to a great extent or degree; a significant or great amount; for example, as used herein “substantially” as applied to “substantially” covered means that a thing is at least 90% covered. 
     As used herein, the term “alignment” refers to the spatial property possessed by an arrangement or position of things in a straight line or in parallel lines. 
     As used herein, the terms “orientation” or “position” used interchangeably herein refer to the spatial property of a place where or way in which something is situated; for example, “the position of the hands on the clock.” 
     These terms may be defined with additional language in the remaining portions of the specification. 
     SUMMARY OF THE INVENTION 
     In response to the difficulties and problems discussed herein, a restrictor is provided. The restrictor is for use in a dispenser adapted to dispense a stack of sheet material, the stack having a top sheet positioned at an upper end of the stack of sheet material and a next sheet positioned under the top sheet. The restrictor comprises a body configured to be positioned on top of and across a back of a top sheet of a stack of sheet material disposed in a dispenser. When the dispenser is activated to remove sheet material, the body permits the top sheet to be dispensed from the dispenser. The body is configured to limit movement of the back of the top sheet and the next sheet. When the top sheet is moved away from the next sheet and dispensed, a front of the next sheet is positioned in a substantially flat position such that the next sheet becomes a new top sheet and it is positioned for dispensing when the dispenser is again activated. 
     In another aspect of the invention, a restrictor adapted for use in a dispenser which dispenses a stack of sheet material is provided. The restrictor comprises a body positioned to put pressure on a portion of an upper end of a stack of sheet material disposed in a dispenser. The body includes a front portion having narrow perimeter and an opening formed therein which provides a pick/push zone. The body also includes a back portion providing substantial weight relative to the front portion to a top sheet positioned at an upper end of a stack of sheet material thereby restricting its movement and the movement of a next sheet positioned under the top sheet and sheets positioned thereunder. The back portion has an opening which permits movement of the next sheet when a top sheet is dispensed from a dispenser. 
     In yet another aspect of the invention, a cartridge adapted for use in a dispenser for dispensing a stack of sheet materials is provided. The cartridge comprises a housing having an inner surface which forms an internal compartment for holding a stack of sheet material. The housing has an opening along an upper edge. The cartridge includes a stack of sheet material disposed in the compartment. The stack of sheet material has a top sheet positioned on an upper end of the stack and a next sheet positioned underneath the top sheet. The cartridge also includes a restrictor positioned on at least a portion of the top sheet of the stack of sheet material. The restrictor is positioned to provide pressure on at least a portion of the top sheet to restrict movement of sheet material in the housing. When the cartridge is positioned in a dispenser and when the dispenser is activated to remove sheet material, the restrictor acts to permit the top sheet to be dispensed from the dispenser. The restrictor is configured to limit movement of the top sheet and the next sheet to permit the top sheet only to be dispensed. When the top sheet is dispensed, the restrictor is configured to hold the next sheet in a position such that the next sheet becomes a new top sheet and the dispensing process is ready to be repeated. 
     In still another aspect of the invention, a system for dispensing sheet material is provided. The system comprises a dispenser including a housing. The housing comprises a container and a lid which cooperate to provide an inner surface formed to include an internal compartment configured to hold sheet material. The housing includes an exit port for withdrawal of sheet material. The housing further includes a sheet mover mounted to the housing. A portion of the sheet mover is configured to move over at least a portion of a sheet material positioned in the housing such that at least the portion of the sheet material is moved away from additional sheet materials positioned adjacent thereto by the sheet mover. When the portion is moved away it is positioned to be easily withdrawn through the exit port by a user. The system also includes a stack of sheet material disposed in the compartment of the housing. The stack of sheet material has a top sheet positioned on an upper end of the stack and a next sheet positioned underneath and next to the top sheet. The system further includes a restrictor positioned on at least a portion of the top sheet of the stack of sheet material. The restrictor is positioned to provide pressure on at least a portion of the top sheet to restrict movement of the sheet material in the housing. When the dispenser is activated to dispense sheet material via movement of the sheet mover, the restrictor acts to permit the top sheet to be dispensed from the dispenser. The restrictor is configured to limit movement of the top sheet and the next sheet to permit only the top sheet to be dispensed. When the top sheet is dispensed, the restrictor acts to hold the next sheet in a position such that the next sheet becomes a new top sheet and the dispensing process is ready to be repeated. 
     In still yet another aspect of the invention, a system for dispensing sheet material is provided. The system comprises a dispenser including a housing. The housing comprises a container and a lid which cooperate to provide an inner surface formed to include an internal compartment configured to hold sheet material. The housing includes an exit port for withdrawal of sheet material. The housing further includes a sheet mover mounted to the housing. A portion of the sheet mover is configured to move over at least a portion of a sheet material positioned in the housing such that at least the portion of the sheet material is moved away from additional sheet materials positioned adjacent thereto by the sheet mover. The portion moved away is positioned to be easily withdrawn through the exit port by a user. The system also includes a cartridge adapted for use in a dispenser for dispensing a stack of sheet materials. The cartridge comprises a housing having an inner surface which forms an internal compartment for holding a stack of sheet material. The housing also includes an opening formed along an upper edge thereof. The cartridge also includes a stack of sheet material disposed in the compartment. The stack of sheet material has a top sheet positioned on an upper end of the stack and a next sheet positioned underneath the top sheet. The cartridge further includes a restrictor positioned on at least a portion of the top sheet of the stack of sheet material. The restrictor is positioned to provide pressure on at least a portion of the top sheet to restrict movement of the sheet material in the housing. When the cartridge is positioned in a dispenser and when the dispenser is activated to dispense sheet material via the movement of the sheet mover, the restrictor acts to permit the top sheet to be dispensed from the dispenser. The restrictor is configured to limit movement of the top sheet and the next sheet to permit only dispensing of the top sheet. When the top sheet is dispensed, the restrictor is configured to hold the next sheet in a position such that the next sheet becomes a new top sheet and the dispensing process is ready to be repeated. 
     Other features and aspects of the present invention are discussed in greater detail below. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The present invention will be more fully understood from the following detailed description, taken in conjunction with the accompanying drawings (not to scale), wherein like reference numerals refer to like parts, and in which: 
         FIG. 1  is a perspective view of the system and dispenser of the present invention, showing a housing having a lid and a tray container; 
         FIG. 2  is a perspective view of the system and dispenser of  FIG. 1 , but showing the lid lifted away from the tray container to show the cartridge having a restrictor therewith; 
         FIG. 3  is a sectional view of  FIG. 1  taken along lines  3 - 3 ; 
         FIG. 4  is a sectional view similar to  FIG. 3 , but showing the lid opening and the sheet mover moving across a portion of a top sheet of sheet material; 
         FIG. 5  is sectional view similar to  FIG. 4 , but showing the lid raised and a portion of the top sheet bunched or raised and moved upward by the sheet mover; 
         FIG. 6  is a partial sectional view, showing the toe of the sheet mover and the pick thereon moving over the top sheet and the pick grabbing or snagging the portion of the top sheet and moving the portion upward; 
         FIG. 7  is a partial sectional view of  FIG. 5  taken generally along line  7  showing the pick on the toe of the sheet mover positioned and engaged against the portion of the top sheet and lifting the top sheet upward; 
         FIG. 8  is a perspective sectional view similar to  FIG. 5  but showing the sheet mover moving the top sheet toward a portion of the restrictor and the next sheet positioned forward of the bunched and raised portion of the top sheet; 
         FIG. 9  is a partial sectional view of similar to  FIG. 5  but showing the disengagement of movement away of the pick on the toe of the sheet mover; 
         FIG. 10  is a perspective view of a cartridge having a cover and release sheet thereon; 
         FIG. 11  is a perspective view similar to  FIG. 10 , but showing one end of the release sheet lifted for removal; 
         FIG. 12  is a perspective view similar to  FIG. 11 , but showing the release sheet removed from the cover and an opening in the cover which reveals a portion of a restrictor and a portion of the top sheet of the stack of sheet material contained in the cartridge; 
         FIG. 13  is a perspective view similar to  FIG. 12 , but showing the cover removed and the restrictor positioned on the top sheet of the stack of sheet material contained in the cartridge; 
         FIG. 14  is a perspective view of the restrictor of the present invention; 
         FIG. 15  is a perspective sectional view of the restrictor in a position on the top sheet of a stack of sheet material; 
         FIG. 16  is a sectional view of  FIG. 15 , taken along lines  16 - 16 ; 
         FIG. 17  is a top plan view of a cartridge having a restrictor and a stack of sheet material therein; 
         FIG. 18  is a sectional view of  FIG. 17  taken along lines  18 - 18 ; 
         FIG. 19  is a partial sectional view of  FIG. 18  taken along line  19 ; 
         FIG. 20  is a sectional view similar to  FIG. 18 , but showing three cartridges having restrictors and sheet material disposed therein and covers on the upper surface; showing the support of weight of the cartridges received by a plurality or ribs on the restrictor positioned adjacent the cover; 
         FIG. 21  is a partial sectional view of  FIG. 20  taken along line  21 ; and 
         FIG. 22  is a bar graph showing the results of dispensing sheet material without a restrictor and with a restrictor from the dispenser. 
     
    
    
     DETAILED DESCRIPTION 
     Reference will now be made in detail to the presently preferred embodiments of the invention, one or more examples of which are illustrated in the drawings. Each example is provided by way of explanation of the invention and is not meant as a limitation of the invention. For example, features illustrated or described as part of one embodiment or figure can be used on another embodiment or figure to yield yet another embodiment. It is intended that the present invention include such modifications and variations. 
     The present invention provides an apparatus for dispensing stacks of sheet materials. Such sheet materials may include, but are not limited to, woven materials, nonwoven materials, synthetic materials, natural materials, foils, polymer films, any combination thereof, and so forth. Exemplary sheet materials for which the present invention is suitable include, but are not limited to, absorbent sheet materials such as towels, wipers, tissue, napkins, and so forth. The specific composition of the sheet materials dispensed can vary as desired. Exemplary sheet materials and methods of making the same include, but are not limited to, those described in U.S. Pat. Nos. 3,301,746; 3,322,617; 3,650,882; 4,100,324; 4,436,780; 4,659,609; 4,737,393; 5,048,589; 5,284,703; 5,399,412; 5,494,554; 5,607,551; 5,672,248; 5,674,590; 5,716,691; 5,772,845; 5,776,306; 5,904,971; 6,077,590; 6,248,212; 6,273,996; 6,096,152; and so forth. While woven and/or nonwoven sheet-like products are generally discussed with regard to the sheet material shown and/or described in embodiments herein, it will be understood that various other products could be substituted therefore. 
     Desirably, but not by way of limitation, the sheet materials for which the present invention is suitable are provided as a stack of sheet materials. Such sheet materials may be connected or un-connected. The sheet materials may be folded, interfolded, tabbed and/or festooned. Desirably, however, the sheet materials are provided as individual sheets in a stack of generally aligned sheet materials. 
     The present invention, as illustrated in  FIGS. 1-22 , comprises a system  10  which includes a dispenser  12  and sheet materials  14 . The sheet materials  14  may be provided in a cartridge  16  or separately. If the sheet materials  14  are provided in a cartridge  16 , it may include a cover  17  which may also include a removable seal or release sheet  18  which is positioned as a seal over an opening  19  therein (shown in  FIGS. 10-13 ). A restrictor  20  is desirably provided as well ( FIGS. 14-21 ). The restrictor  20  is desirably positioned on top of the sheet materials  14 , which are desirably provided in a stack  22  of sheet materials, whether the sheet materials  14  are provided separately, or in the cartridge  16 . Therefore, the restrictor  20  may be provided separately ( FIGS. 14-16 ) or with the dispenser  12 , or it may be provided on top of a stack  22  of sheet materials  14  contained in the cartridge  16  ( FIGS. 17-21 ). 
     The sheet materials  14  may be premoistened with a liquid. Alternatively, the sheet materials  14  may be dry. Desirably, the stack  22  of sheet materials  14  are provided as single or individual sheet materials which are not connected to each other, and the stack  22  is desirably provided in a generally aligned and planar orientation. 
     Referring now to  FIGS. 1-9 , the system  10  includes the dispenser  12  which comprises a dispenser housing  23  having a tray container  24  and a lid  25 . The tray container  24  includes a front wall  26  and a back wall  28  which are spaced-apart and intersect a lower end  30 , as illustrated in  FIGS. 1-5 . A pair of spaced-apart side walls  32  intersect the lower end  30  and cooperate with the front and back walls  26 ,  28  to provide an inner surface  34  which provides an internal compartment  36  configured to hold sheet materials  14 , desirably a stack  22  of sheet materials  14  or a cartridge  16  of sheet materials  14  in the tray container  24  and dispenser housing  23 . The front wall  26 , back wall  28  and side walls  32  may include a flange  38  which is provided along an upper edge  39  of the tray container  24 . The flange  39 , for example, but not by way of limitation, may extend at a generally perpendicular angle relative to the front and back walls  26 ,  28  and sidewalls  32 . The tray container  24  may include a mechanism (not shown) which permits it to releasably coupled to the lid  25 , which may also have a cooperative mechanism, which permits the lid  25  to be held in a closed position against the upper edge  39  and flange  38  of the tray container  24 . 
     The lid  25  is desirably pivotably coupled to the tray container  24 , and desirably provides sufficient closure to maintain premoistened sheet material  14  disposed therein in a premoistened state when such premoistened sheet material  14  is loaded in the dispenser  12  or when liquid is provided to the sheet material  14  disposed in the dispenser  12 . The lid  25  may comprise one piece. Desirably, however, as illustrated herein, the lid  25  may include a first lid section  42  which is desirably, but not by way of limitation, pivotably coupled to a second lid section  44  via at least one hinge  45  to permit the internal compartment  36  and the sheet materials  14  therein to be accessed by a user. In addition, this design permits the first lid section  42  to function as an exit port  46 . The first lid section  42  may include a pair of spaced-apart tapered side walls  47  and a front wall  48  which cooperate to provide the first lid section  42 . 
     The first and second lid sections  42 ,  44  may also include a lip  49  which extends outwardly from a lower perimeter edge  50  of the lid  25 . The lip  49  of the lid  25  desirably cooperates with the upper edge  39  and flange  38  to provide a releasable closure to the dispenser housing  23  and to reduce or prevent moisture contained in the dispenser housing  23  from evaporating. 
     A locking assembly  51  for a sheet mover is provided in the dispenser housing  23  ( FIGS. 2-5  and  8 ). The second lid section  44  includes a rod holder  52  coupled to an inner surface  34  of the second lid section  44  which has a pair of spaced-apart side walls  53  extending downward from the second lid section  44 , and opening positioned in each side wall  53 . A push rod  54  is pivotably coupled at one end to the rod holder  52 . The push rod  54  includes, at the one end, a transversely positioned pivot bar  56  having a pin  58  at each end thereof. The pins  58  extend through openings in the side walls  53  of the rod holder  52  to permit the pivot bar  56  to pivotably couple to the rod holder  52 . The push rod  54  includes, at an opposite end thereof, a generally, though not by way of limitation, U-shaped yoke  60 . The yoke  60  includes a pair of spaced-apart side arms  62 , each of which includes a slot (not shown) therein. A shield  64  for a pivotal leg is positioned on the inner surface  34  of the first lid section  42 , and the shield  64  includes a pair of spaced-apart side walls  66  which extend downward from the inner surface  34  at a generally perpendicular angle thereto, each of which has an elongated slot  68  formed therein. Coupled to the shield  64  and yoke  60  is a sheet mover or pivotal leg  70 , which is one primary operative member of the dispenser  12  but it is not a part of the locking assembly  51 . 
     The pivotal leg  70  is configured to be moved at least partially out of the shield  64  yet also received and releasably held in the shield  64  of the locking assembly, as shown in  FIGS. 2-9 . The pivotal leg  70  includes at one end a transversely positioned pivotal bar  72  ( FIG. 2 ) having, at each end thereof, a pin  74 . The pivotal leg  70  also includes at an opposite end thereof a toe  76 . A body  77  of the pivotal leg  70  extends between the leg  70  and the toe  76 . The toe  76  may include, but not by way of limitation, one or more roller(s) or wheel(s)  78  which are rotatably mounted via a pin  80  on either side of the toe  76  which couples the at least one wheel  78  to the toe  76  and to permit the wheel  78  to rotate on an axis  81  which is generally transverse to the orientation of the toe  76 . The wheel(s)  78  desirably moves tangent to a top sheet  82  of the stack  18  of sheet materials  14  to permit smooth movement of the toe  76  as it contacts and rolls or moves over the top sheet  82 . Alternatively, the toe  76  is provided without the at least one roller or wheel (not shown). The toe  76  is desirably formed to remove frictional resistance and to permit smooth contact and movement of the toe  76  over the sheet material  14  until the toe  76  reaches a point of desirably moving and/or lifting the sheet material  14 . 
     A lower surface  84  of the toe  76  desirably includes at least one tooth or similar apparatus which acts as a pick  86  (illustrated best in  FIGS. 6-9 ). As the toe  76  moves across an upper surface of the top sheet  82 , the lower surface  84  of the toe  76  is slightly rotated due to the changing angle of the toe  76  as the first lid section  42  is lifted. This action causes the toe  76  to move across the top sheet  82  until it moves or rotates sufficiently such that the pick  86  comes into contact with the top sheet  82  of the stack  22  of sheet materials  14 . The pick  86  moves against the top sheet  82  to desirably snag, grab and pick up a portion of the top sheet  82 , when the first lid section  42  of the lid  25  is lifted, as will be described in greater detail below. Desirably, but not by way of limitation, the pick  86  is configured to snag or grab the top sheet  82  and may slightly pierce a very small portion of the upper surface  88  of the top sheet  82  without tearing the top sheet  82  or creating any significant aperture or opening therein. This action moves or lifts a portion  89  of the top sheet  82  upward and away from the stack  22  such that the portion  89  is puckered, bunched, ruffled, wrinkled, and/or moved upward in a direction  90 , away from the stack  22 . Desirably, as the pivotal leg  70  continues to move, the pick  86  becomes disengaged ( FIG. 9 ) from the portion  89  such that the portion  89  remains in its bunched, ruffled, wrinkled and/or puckered position away from the stack  22 , for easy removal by a user. Alternatively, the portion  89  may remain coupled to the pick  86  for removal by a user. A restrictor  20  may be used and placed on the top sheet  82  of the stack  22  of sheet materials  14 , as shown in  FIGS. 14-16 . The restrictor  20  may greatly enhance the reliable movement or “pick” of each top sheet  82  when the pivotal leg  70  moves thereagainst, and will be described in greater detail below. 
     In another alternative, the top sheet  82  is pushed by the toe  76  of the pivotal leg  70  to cause at least the portion  89  of the top sheet  82  to lift up and/or to move away in the direction  90  from the remaining stack  22  of sheet material  14 . The top sheet  82 , however, is not snagged, grabbed or attached to the pick  86  or the toe  76  of the pivotal leg  70 . Instead, the pick  86  and/or toe  76  may be modified to create friction against at least the portion  89  of the top sheet  82  without snagging or otherwise attaching itself to the top sheet  82 . That is, the pick  86 , toe  76  and/or any portion of the leg  70  may be formed to rub, bunch, push and/or move the portion  89  of the top sheet  82  upward in the direction  90  and/or away from the remainder of the stack  22 . In this manner, the pick  86 , if any, and/or the toe  76  may include a material, such as, for example only, rubber, plastic, metal, and so forth and/or be formed with frictional characteristics which would cause sufficient friction against the top sheet  82  to cause bunching, ruffling, gathering and/or movement of the top sheet  82  to provide the portion  89  in the described position. Therefore, the toe  76  may be provided without a pick (not shown). The toe may include one or more ridges, raised portions, and so forth, to provide friction against the top sheet  82  (not shown). In this way, the portion  89  of the top sheet  82  presents itself to be removed from the dispenser  12  by a user, who would likely, but not by way of limitation, grasp the portion  89  between the user&#39;s thumb and first finger to do so. In this alternative, the restrictor may also be utilized (not shown). 
     It will be understood that the top sheet  82  is the uppermost sheet in the stack  22  of sheet material  14 . The top sheet  82  is situated closest to the exit port  46 . A next sheet  92  is provided immediately below and against the top sheet  82 . When the top sheet  82  is removed from the stack  22 , the next sheet  92  ( FIG. 8 ), underneath the top sheet  82 , becomes the new top sheet. Therefore, the new sheet under the new top sheet  82  becomes the new next sheet  92 . This process desirably continues until all sheet materials  14  are dispensed from the dispenser  12 . 
     Turning back to the locking assembly  51 , as illustrated in  FIGS. 2-5  and  8 , the ends of the pivotal bar  72  are desirably positioned through the elongated slot  68  of the shield  64  and the pins  74  on the ends  73  are desirably positioned through the slots (not shown) in the arms  62  of the yoke  60  of the push rod  54 . The shield  64  may be formed integrally with or formed separately and coupled to the inner surface  34  of the first lid section  42  ( FIG. 2 ). 
     The shield  64  desirably is generally formed in a shape to surround the pivotal leg  70  and to generally follow its contours. The shield  64  includes a retaining bar  94  ( FIG. 2 ) which couples to and extends between the side walls  66  of the shield  64 , which acts to urge and hold the pivotal leg  70  in a position in the shield  64  in which a substantial portion of the pivotal leg  70  rests between the sidewalls  66  of the shield  64  and against or closely adjacent the inner surface  34  of the first lid section  42  of the lid  25 . The pivotal leg  70  is positioned in the shield  64  such that each end  73  of the pivotal bar  72  of the pivotal leg  70  extends through one of the elongated slots  68  to permit pivotable movement as well as forward and backward movement of the pivotal leg  70  within the shield  64 , as shown in  FIGS. 2-5  and  8 . Such movement is further controlled by the pivotal coupling of the pins  74  on each end  73  of the pivotal bar  72  to the slots in the arms  62  of the yoke  60 . 
     As the first lid section  42  is raised in an opening direction  96 , the yoke  60  moves over the pins  74  of the pivotal bar  72  which are positioned through the slots in the side arms  62  of the yoke  60  which provides a dwell period prior to the pivotal leg  70  being pulled rearward. This design ensures that the pivotal leg  70  can pivot or move through the range of movement needed to snag, grab or push the lowest or last sheet material  14  in the stack  22  of sheet materials  14 , i.e. the last top sheet  82 , before the pivotal leg  70  starts moving upward into shield  64  of the locking assembly  51 .  FIGS. 1 and 3  illustrates the first lid section  42  closed and the ends and pins  74  positioned forward in the elongated slot  68  in the sidewalls  66  of the shield  64 . As first lid section  42  is opened, the yoke  60  is moved such that the ends and pins  74  therein move rearward in the elongated slot  68 , as shown in  FIGS. 4-5 , at which time the pivotal leg  70  is pulled rearward and upward via movement of the ends of the pivotal bar  72  in the elongated slots  68  in the sidewalls  66  of the shield  64 . When each pin  74  of the pivotal bar  72  of the pivotal leg  70  moves rearward in each elongated slot  68  of the shield  64 , the attached yoke  60  and push rod  54  pull the pins  74  and the ends of the leg  70  rearward within the elongated slot  68  of the side walls  64  of the shield  64 . This action also moves a portion of the body  77  (or ramp) of the pivotal leg  70  against the retaining bar  94  of the shield  64 . These two actions cooperate to pull the pivotal leg  70  into the shield  64  of the locking assembly  51  when the first lid section  42  is raised higher in the opening direction  96  ( FIG. 2 ). With the pivotal leg  70  completely held by the shield  64 , the toe  76  and the pick  86  are positioned therein and are therefore moved away from a user&#39;s hand. The side walls  66  of the shield  64  are configured to extend beyond the toe  76  and the pick  86  when the pivotal leg  70  is received and/or held therein. This configuration protects a user&#39;s hand from being pricked by the pick  86 . In addition, the pivotal leg  70  is moved out of the way so that additional sheet materials  14  or cartridge  16  may be added to the tray container  24  without the sheet material  14  getting snagged or grabbed by the pick  86  during insertion. When in a dispensing position, however, the locking assembly  51 , namely, the rod holder  52 , the pivot bar  56  and the shield  64  are configured to hold the pivotal leg  70  positioned such that the toe  76  and pick  86  of the pivotal leg  70  will contact and move sufficiently within the internal compartment  36  and against the top sheet  82  of the sheet material  14  contained therein to permit the pick  86  to snag or grab the lowest or last sheet in the stack  18  of sheet materials  14 . 
     That is, when the first lid section  42  is moved in a closing direction  100  ( FIGS. 2 and 3 ), this action permits the toe  76  of the pivotal leg  70  to move downward, out of the shield  64  and into its resting position against the new top sheet  82  of the stack  22  of sheet material  14 . The toe  76  and pick  86  thereon are again in a position to move over the new top sheet  82  to snag or grasp another portion  89  of the new top sheet  82  for removal. The first lid section  42  and lid  25  desirably closes sufficiently against the tray container  24  such that evaporation of any moisture contained in the dispenser housing  23  is reduced or eliminated ( FIG. 1 ). 
     The sheet material  14  used as a part of the system  10  is desirably, but not by way of limitation, contained in a stack  22  of sheet materials  14  disposed in a cartridge  16 , as illustrated in  FIGS. 8 ,  10 - 13  and  17 - 21 . Such a cartridge  16  may include a tub  102  having a front wall  104 , a back wall  106  which are spaced-apart and which intersect a lower end  108 . A pair of spaced-apart side walls  110  intersect the lower end  108  as well and cooperate with the front and back walls  104 ,  106  to provide an inner surface  112  with defines an internal compartment  114  configured to hold the stack  22  of sheet material  14 . The cartridge  16  includes an upper edge  116  and the cartridge desirably includes the cover which is coupled thereto. The cover  17  desirably includes the release sheet  19  positioned over the opening  20  in the cover  17 . In this manner, when the cartridge  16  is positioned in the tray container  14 , the release sheet  19  is removed and the opening is exposed so that the sheet mover or pivotal leg  70  may access the sheet material  14 . 
     The cartridge  16  may alternatively be provided as a polymer or plastic package, having a seal or release sheet which is removable over an area which includes an opening or, alternatively, areas of weakness, such as perforations (not shown). In another alternative, the cartridge may include a plastic container having a lid or removable portion on at least a portion of a surface thereof. The cartridge may be formed from any material or combination of materials, and in any configuration, so long as the cartridge operates as shown and/or described herein. 
     The restrictor  20  may be used in conjunction with the dispenser  12 , as illustrated in  FIGS. 2 ,  6 - 9  and  12 - 21 . The restrictor  20  acts to assist the dispenser  12  to permit one sheet material  14  at a time to be dispensed from the dispenser system  10 . Further, the restrictor  20  desirably assists in holding sheet material  14  positioned in an aligned position in the stack  22  in the dispenser  12  or in a cartridge  16  from being displaced during shipping, delivery and/or dispensing. 
     The restrictor  20  operates to reduce or prevent double dispensing, that is, two sheet materials  14  dispensed together instead of one. Further, the restrictor  20  operates to reduce or prevent dispensing failure. 
     The restrictor  20  is desirably, but not by way of limitation, planar in configuration and desirably follows the configuration of the stack  22  of sheet material  14  upon which it rests, as shown in  FIGS. 14-16 . It desirably includes a body or plate  118  having an upper surface  120 , a lower surface  122  and an outer perimeter  124 . The restrictor  20  may also include a front portion  126  and a back portion  128 . 
     The front portion  126  desirably includes an opening  130  formed through the restrictor  20  and sized and configured to permit the pivotal leg  70  to drop down and travel across the top sheet  82  which is exposed through the opening  130  in order to move the portion  89  of the top sheet  82  into a bunched, ruffled, wrinkled position to make it easy for a user to grasp the portion  89  and withdraw the top sheet  82  from the exit port  46  of the dispenser housing  23 . The front portion  126  desirably provides a narrow outer perimeter  124  to assist in holding the edges  132  of the stack  22  of sheet materials  14  in a stacked and aligned orientation or position. Moreover, the perimeter  124  of the front portion  126  may be formed to include a narrow portion of the perimeter  124  on only one side  134 , or, alternatively a narrow portion of the perimeter  124  may be formed on two sides  134 . In the present embodiment, the perimeter  124  includes two narrow sides  134  and a narrow end portion  138  extending therebetween and positioned adjacent the front wall of the cartridge  104  or dispenser  26 . In another alternative (not shown), the front portion  126  is not provided, and only the back portion  128  provides the restrictor  20 . When the front portion  126  is included as a portion of the restrictor  20 , as illustrated in the present embodiment, it desirably assists in positioning and holding the back portion  128  into a desirable position to permit the restrictor  20  to operate to reduce or eliminate dispensing problems. 
     The back portion  128  is desirably heavier in weight than the front portion  126 , and is desirably about twice the thickness thereof. The back portion includes a holder  140  which extends transversely across the length of the restrictor  20  and is formed along a front of the back portion  128 . The holder  140  acts as a holding area in to hold the portion  89  of the top sheet  82  when the portion  82  is snagged or moved against the holder  140  such that the portion  89  bunches or ruffles in the direction  90  upward. 
     The back portion  128  includes a wide perimeter edge  141  which extends about the perimeter in a general U-shape from one side of the holder  140  to an opposite side. The U-shaped is formed, in part, by an opening  142  which is formed through the center of the back portion  128 . The opening  142  may be, but not by way of limitation, provided as a smaller opening relative to the opening  130  in the front portion  126 . The opening  142  desirably provides a “relief zone” for the next sheet  92  in that if a portion of the next sheet  92  is pulled along with the top sheet  82  when the top sheet  82  is being dispensed, the portion of the next sheet  92  which is pulled is generally held in the opening  142  which assists in preventing double dispensing and/or jamming or wadding of sheet material  14  in the stack  22  when one sheet  14 , i.e., the top sheet  82 , is being dispensed. While the back portion  128  desirably includes the wide perimeter edge  141 , it will be understood that, alternatively, the back portion may be formed as a solid component without an opening (not shown). 
     Certain types of sheet material  14  may slide easily, and have a low surface tension. Adding, desirably, isopropyl alcohol and/or other liquids as a moistening solution to premoisten the sheet material  14  in the dispenser  12  and/or the cartridge  16  results in greatly reduced surface tension between the sheets  14 . Therefore, the sheet material  14  greatly resists staying in alignment, whether dry or premoistened. Increased slippage of sheet material  14  results in wadding of sheet material  14  leading to inadequate dispensing, excessive dispensing and/or dispensing failure. In addition, the liquid may cause some sheets  14  in the stack  22  to stick or clump together. These same sheets  14  may also slip out of alignment in the stack  22 . The restrictor  92  acts to reduce or eliminate these problems. 
     The back portion  128 , while thicker than the front portion  126  as described, also may include, but not by way of limitation, a step  146  on the lower surface of the restrictor  20 , due to its increased thickness. That is, the step  146  may position the lower surface  122  of the front portion  126  of the restrictor  20  a small distance from the top sheet  82  in the area where the front portion  126  and the back portion  128  are joined or integrally formed together. Alternatively, the step may be removed and the lower surface of the restrictor tapered (not shown). 
     The restrictor  20  provides both weight and structure to prevent movement of the sheet material  14 . It will be understood that desirably at least about 60 percent of the weight of the restrictor is in the back portion  128 . Even more desirably, at least about 70 percent of the weight of the restrictor is in the back portion  128 . Even more desirably, at least about 80 percent of the weight of the restrictor is in the back portion  128 . Yet even more desirably, at least about 90 percent of the weight of the restrictor is in the back portion  128 . 
     In addition, the weight of the restrictor  20  is desirably in a range from about 30 grams to about 70 grams. Desirably, the weight of the restrictor is in a range of about 40 grams to about 60 grams. Even more desirably, the weight of the restrictor is in a range of about 45 grams to about 55 grams. Yet even more desirably, the weight of the restrictor is in a range of about 48 grams to about 52 grams. 
     The restrictor  20  is desirably provided in any shape or configuration so long as the restrictor operates as shown and/or described. The restrictor  20  may be provided, as previously noted, with only the back portion  128  (not shown). In this alternative, the dispenser  12 , the restrictor  20  and/or the cartridge  16  may include a rib, other mechanical member, and so forth, to prevent the restrictor from slipping forward. The restrictor  20  provides improved dispensing when the weight of the restrictor  20  prevents the perimeter edges  132  of the sheet materials  14 , which may have been heat and/or laser sealed, and so forth, from snagging edges  132  of adjacent sheet materials  14  when the top sheet  82  is being withdrawn and dispensed. The relief zone or opening  142  of the back portion  128  functions to hold any snagged sheets  14  in a position which prevents double dispensing or jamming. 
     While the restrictor  20  may be provided separately, or it may be provided as a component of the dispenser  12  (not shown), the restrictor  20  may also be provided in a cartridge  16  which may be filled with sheet materials  14 . In this instance, the restrictor  20  may desirably include a plurality of ribs  150  provided on the upper surface  120  thereof. The ribs  150  may be provided in any portions of either upper and/or lower surface  120 ,  122 . In the present embodiment, the ribs  150  are generally formed adjacent to the outer perimeter  124  and adjacent at least a portion of an outer perimeter  152  of the opening  130  in the front portion  126  and the perimeter  154  of the opening  142  in the back portion  128 . Additional ribs  150  may be provided in a spaced-apart configuration and positioned generally transversely on the holder  140 . It will be understood that other positions of the plurality of ribs are possible. 
     The plurality of ribs  150  are provided to assist in supporting the cover  17  which is desirably coupled in an air-tight configuration and/or sealed to the upper edge  116  of the cartridge  16  so that liquid which is used to premoisten the sheet material  14  does not evaporate, as shown in  FIGS. 17-21 . Too much air in the cartridge  16  causes the cover  17  of the cartridge  16  to balloon or expand somewhat. It also encourages the sheet material  14  in the stack to move and become unaligned. Further, when the cartridges  16  are stacked on top of each other in a box or container for transport, pressure from one cartridge  16  stacked on top of another may cause the air in each cartridge  16  to cause the cover  17  to break open or the seal provided by the release sheet  18  to break or rupture, resulting in evaporation of the liquid in each cartridge  16 . 
     The plurality of ribs  150  may extend transversely upward from the upper surface  120  of the restrictor  20  to assist in supporting the cover  17  on top of the stack  22  of sheet materials  14 . That is, the height of the ribs  150 , when on top of the full stack  22 , are about the same height as the upper edge  116  of the cartridge  16 . When the restrictor  20  is in place, the stack  22  cannot by overly compressed, nor can the air contained within the internal compartment  114  of the cartridge  16 . This design of the restrictor  20  assists in preventing leakage of air and spillage or evaporation of liquid from the cartridge  16  since it greatly reduces and prevents breakage or openings in the cover  17  or release sheet  18  caused by compression or displacement of air, sheet material or liquid. The restrictor  20  also assists in holding the sheet materials  14  in an aligned stack  20  and reduces or prevents displacement and/or misalignment of the sheet materials  14  in the stack  22  during shipment. 
       FIGS. 17-21  illustrate the common manner of packing a plurality of cartridges  16  in a box or container (not shown) for shipping. Often, but not by way of limitation, the cartridges  16  may be stacked six cartridges one on top of another. The plurality of ribs  150  on the upper surface  120  of the restrictor  20  operate to support each cartridge  16  one on top of the other without breaking or causing unwanted openings to form in the cover  17  or the seal of the release sheet  18 . The sheets  14  are supported in the stack  22  in their proper aligned position. 
     The cover  17  of the cartridge  16  may interact with the restrictor  20  as well. The opening  19  in the cover  17  corresponds generally, but not by way of limitation, to the size, shape and location of the opening  130  in the front portion  126  of the restrictor  20  such that a push zone or pick zone  156  (collectively a pick/push zone) is provided for the pivotal leg  70  to move downward through the opening  19  in the cover  17  and the opening  130  in the front portion  126  of the restrictor  20  so that the leg  70  may contact and move across the top sheet  20  to move, pick, bunch, wrinkle, snag, and so forth the portion  89  within this zone  156 . 
     The weight of the back portion  128  provides both weight, compression and friction to a back  158  of the stack  20  of sheet materials  14  so that movement of the back  158  of the stack or a portion of a sheet  14  in the back  158  is restricted. In this manner, double dispensing, snagging of sheets  14  together and/or streaming may be reduced or prevented. The front  160  of the stack  22  does not compress so that the top sheet  82  is readily picked or snagged and the portion  89  is provided in the pick zone  156  so that the portion  89  can be easily and readily grasped by a user and removed from the cartridge  16  and through the exit port  46  of the dispenser  12 . 
     When the release sheet  18  is removed from the cover  17  to expose the opening  19  and the cartridge  16  of sheet materials  14  is disposed in the dispenser  12 , the cover  17  may operate to interact with the restrictor  20  to assist in dispensing. That is, when the pivotal leg  70  snags and bunches the portion  89  of the top sheet  82  for withdrawal of the top sheet  82  from the cartridge  16  and the exit port  46  of the dispenser  12 , the restrictor  20 , especially the front portion  126  thereof, may lifts up during the withdrawal of the top sheet  82  from the dispenser  12 . The opening  19  in the cover  17  is desirably sized smaller than the front portion  126  of the restrictor  20 . Therefore, if the front portion  126  of the restrictor  20  lifts when the top sheet  82  is being withdrawn by a user, the surrounding cover  17  acts to hold the restrictor  20  in a position within the cartridge  16  so that the restrictor  20  continues to be generally positioned for operation over the stack  22  of sheet materials  14 . Alternatively, the weight of the restrictor  20  may be adjusted to hold the restrictor  20  in a position in the dispenser  12  or cartridge  16 . In another alternative, for example, but not by way of limitation, ribs or tabs may be provided in one or more walls or positions in the dispenser or the cartridge to limit movement of the restrictor during dispensing (not shown). 
     In a method of using a restrictor positioned in a cartridge with a dispenser, the dispenser  12  described herein, or an equivalent (not shown), is provided, as shown in  FIGS. 1-9 . Desirably, a cartridge  16  containing a stack  22  of sheet materials  14  is provided. More desirably, a restrictor  20  is provided positioned on the top of the stack  20  is provided ( FIGS. 10-13 ). The cartridge may include a cover  17  having a release sheet  18  positioned over an opening  19  therein. Desirably, the release sheet  18  is removed from the cover  17 . The first lid section  42  of the lid  25  is raised and the cartridge  16  is positioned in the internal compartment  36  of the dispenser housing  23  with the opening  19  in the cartridge  16  positioned adjacent the front wall  26  of the dispenser housing  23 . 
     The lid  25  is closed over the tray container  24  ( FIGS. 1 and 3 ) and when a user desires to obtain a sheet material from the dispenser  12 , the user raises the first section  42  of the lid  25 . The first lid section  42  is raised in an opening direction  96  ( FIGS. 2-9 ) and this action causes the pivotal leg  70  to move across the top sheet  82  in the pick zone  156 . The toe  76  of the pivotal leg  70  contacts and maintains this contact while moving across the top sheet  82  in a direction  162  until the toe  76  rotates slightly which positions at least one pick  86  against the top sheet  82  such that the pick  86  snags or grabs the portion  89  of the top sheet  82  and pushes the portion  89  against the holder  140  of the restrictor  20  and raises the portion  89  of the top sheet  82  in the upward direction  90  such that it causes an upward bunch, ruffle, wrinkle, and so forth of the portion  89 . The pivotal leg  70  is moved by the locking assembly  51  such the pick  86  on the toe  76  of the pivotal leg  70  detaches from the portion  89  of the top sheet  82 . As this occurs, the front portion  126  of the restrictor  20  may raise upward. If this occurs, the front end  164  of the cover  17  of the cartridge  16  acts to hold the restrictor  20  in position so that the restrictor  20  is not further lifted or moved in the cartridge  16 . Further, when the top sheet  82  is removed by a user, the portion of the top sheet  82  resting under the back portion  128  of the restrictor  20  will be moved out from under the back portion  128  and dispensed through the opening  130  in the front portion  126  of the restrictor  20 , and through the opening  19  in the cover  17  of the cartridge  16  and through the exit port  46  of the dispenser  12 . When this occurs the restrictor  20  acts to positioned at least a front of the next sheet  92  in a substantially flat position while a back portion of the top sheet  82  is pulled from underneath the back portion  128  of the restrictor  20 . In addition, when the portion  89  of the top sheet  82  is grasped and pulled through the opening  130  in the front portion  126 , this action may also cause the front portion  126  of the restrictor  20  to move upward. Again, the front end  164  of the cover  17  may operate to limit movement of the restrictor  20 . Movement of the restrictor  20  may be limited by other means or mechanisms shown and/or described herein, or known in the art. 
     EXAMPLE 
     Referring now to  FIG. 22 , which illustrates the results of using the dispenser described herein with and without the restrictor. 
     Three hundred (300) sheet materials were provided separately in six (6) cartridges, each of which had fifty (50) wipes contained therein, for a total of 300 wipes. The wipes each comprised a woven polyester material, and were aligned in a stack in each cartridge, and the opened cartridge was positioned in the dispenser shown and described herein without a restrictor. The 300 sheet materials were premoistened with isopropyl alcohol. The room temperature was about 75 degrees (plus or minus 5 degrees); the relative humidity was about 50 percent (plus or minus 5 percent). The 300 sheets were then dispensed from the dispenser in the manner described previously herein. 
     Of that amount, about 48 percent were “picked” or “pushed” as shown and described in detail herein, which resulted in successful dispensing to a user. About seventeen (17) percent were side picked, resulting in a smaller ruffled, wrinkled portion adjacent one side of a front portion of the tray container. About twelve (12) percent of attempted dispenses resulted in two sheets being lifted and dispensed together. About three (3) percent of attempted dispenses did not snag or move the top sheet on the first attempt, and a second attempt was required to obtain a top sheet. About two (2) percent of attempted dispenses resulted in no sheet dispensed in spite of two or more attempts to dispense a sheet material. Drag out, that is, a dispensing of the top sheet and the next sheet being moved out (“dragged out”) with the top sheet even though the next sheet was not directly snagged or moved by the pivotal leg. About eighteen (18) percent of the dispenses resulted in drag out of the next sheet along with the top sheet. 
     Five hundred (500) sheet materials were provided separately in ten (10) cartridges, each of which had fifty (50) wipes contained therein, for a total of 500 wipes. The wipes each comprised a woven polyester material identical to the woven polyester material used in the test of 300 wipes without a restrictor. The wipes were aligned in a stack in each cartridge, and the opened cartridge was positioned in the dispenser shown and described herein with the restrictor. The 500 sheet materials were premoistened with isopropyl alcohol. The room temperature was about 75 degrees (plus or minus 5 degrees); the relative humidity was about 50 percent (plus or minus 5 percent). The 500 sheets were then dispensed from the dispenser in the manner described previously herein. 
     Of that amount, about eighty two (82) percent were “picked” or “pushed” as shown and described in detail herein, which resulted in successful dispensing to a user. About ten (10) percent were side picked, resulting in a smaller ruffled, wrinkled portion adjacent one side of the front portion of the restrictor. About five (5) percent of attempted dispenses resulted in two sheets being lifted and dispensed together. About three (3) percent of attempted dispenses did not snag or move the top sheet on the first attempt, and a second attempt was required to obtain a top sheet. About one (1) percent of attempted dispenses resulted in no sheet dispensed in spite of two or more attempts to dispense a sheet material. Drag out, that is, a dispensing of the top sheet and the next sheet being moved out (“dragged out”) with the top sheet even though the next sheet was not directly snagged or moved by the pivotal leg. There were no episodes of drag out when the restrictor was used. 
     A comparison of these events illustrates that use of the restrictor resulted in about a sixty-five (65) percent improvement of episodes of a “good pick” which resulted in a dispensed sheet on the first attempt. The use of the restrictor reduced incidences of double dispensing by about fifty-eight (58) percent. The use of the restrictor resulted in a one-hundred (100) percent reduction in drag out (which results from the snagging of sheets). 
     For the system  10  it will be understood that the pick is not required to push the sheet material away from a stack of sheet materials, or away from adjacent sheet materials. Rather, a pusher, that is, the end of the toe which is configured to cause friction against the top sheet may be used instead to move the top sheet away from the stack of sheet materials or adjacent sheet materials. The term “sheet mover” as used herein is intended to encompass both the “pick” and the “pusher” as well. 
     The system  10  may be positioned adjacent and secured to a support surface (not shown) via a mounting bracket. Such a mounting bracket is disclosed in U.S. Pat. No. 6,533,145 to Richard P. Lewis, et al., which is hereby incorporated by reference herein for all purposes. Other mounting apparatus may be used as well. For example, the dispenser may have an adhesive thereon for holding it in place. Alternatively, the adhesive is a cohesive adhesive wherein both a portion of the dispenser and the support surface have some cohesive adhesive thereon. Mechanical fasteners, suction cups, hook and loop materials, and so forth may be used, and are provided herein as non-limiting examples. It will be understood that any apparatus known to those skilled in the art may be used. 
     It will be appreciated that the system  19  may, alternatively, be constructed to be a one-use, disposable system. Therefore, when all sheet materials are removed from the dispenser, the dispenser is thrown away or disposed of. In clean room-type situations, this may be desirable, to cut down on contamination by lint, dust, and so forth. 
     The sheet material (premoistened or dry) may include one or more materials, such as, but not by way of limitation, meltblown fibers, spunbond fibers, polyester, spunlace, cellulose, and so forth. The sheet material may be provided as dry sheet material, and may be dispensed as dry sheet material. A liquid solution may be added to the sheet material, either before or after it is inserted into a dispenser. Such liquid solution may include, alone or in combination, but not by way of limitation, isopropyl alcohol, deionized water, and so forth. 
     The sheet materials  14 , stack  22  of sheet materials  14 , cartridge  16  and/or restrictor may be provided in any shape, or combination of shapes and configurations. The sheet material may be provided as symmetrical sheet material, or asymmetrical sheet material. Similarly, the dispenser housing  23  may be provided in any configuration, so long as such configuration permits sheet material to be inserted therein to be dispensed therefrom. 
     The cartridge  16  may comprise one or more of the features or characteristics of the dispenser. For instance, the cartridge may include a housing having a portion which is pivotably movable and a pivotal leg/sheet mover coupled thereto. The cartridge may be positioned in a separate, outer housing for dispensing. 
     Similarly, the pick, pusher and/or locking assembly shown and/or described herein may be constructed separately and supplied to a dispenser housing  23  or a cartridge. Such a pick, pusher and/or locking assembly may be constructed from any suitable material that operates as described herein. Such materials may includes plastic, rubber, metal, bristles (natural or synthetic), and so forth. 
     The dispenser  12  may be constructed from any suitable material or combination of materials. Such materials include, but are not limited to, plastic, metal, paper, fiber, wood, and so forth; combinations of these materials may be used together as well. If the dispenser  12  is configured to be a non-refillable, single use, disposable dispenser, it may be constructed from suitable materials for disposal, including, but not limited to, paper, paperboard, plastic, fiber, metal, and so forth. Similarly, combinations of these materials may be utilized. The restrictor is desirably formed from any material or combination of materials, especially, however, those material(s) which are unaffected by long term exposure to a liquid, such as isopropyl alcohol, and so forth. For example, but not by way of limitation, the restrictor may be formed from a plastic, and more desirably, formed from HDPE, polypropylene, styrene, acetyl and so forth. Alternatively, the restrictor is formed from any material and in configuration which permits it to operate as shown and/or described herein. 
     Moreover, the configuration of any component shown and/or described herein is intended as only non-limiting examples. It will be appreciated that any feature(s) in any embodiment shown and/or described herein may be used, substituted and/or combined with any other feature(s) in any other embodiment. 
     While certain characteristics are described in specific embodiments, any one or more characteristics, features, and/or elements may be used in any combination in any embodiment, or to create a particular embodiment from the disclosures, teachings, and/or suggestions provided herein. While the present invention has been described in connection with certain preferred embodiments, it is to be understood that the subject matter encompassed by way of the present invention is not to be limited to those specific embodiments. On the contrary, it is intended for the subject matter of the invention to include all alternatives, modifications and equivalents as can be included within the spirit and scope of the following claims.