FIELD OF THE INVENTION  
         [0001]    This invention relates to display devices for merchandise in retail stores, and more particularly to a device for giving a sound noise indication that an article of merchandise has been removed from the display device.  
         BACKGROUND OF THE INVENTION  
         [0002]    Before the 20 th  century, it was customary for retail store clerks to receive their customers behind a customer counter, so that the customer would directly ask the clerk for such and such commercial goods. The clerk would personally get the requested goods, process the order and receive payment directly from the client. This was a straightforward way of doing business, but it was also a labour-intensive one.  
           [0003]    Now, in the current market in at least North American and European commercial retail stores, a customer typically enters the premises freely and can immediately inspect and has immediate access to most of the commercial goods offered for sale, for example cigarettes, chewing gums, candy bars, and the like, without needing to previously personally contact a store clerk nor enter into a specific contract with the shop owner each times the customer comes in. Indeed, it is now common for store owners to allow customers to inspect, touch, handle or put into a wheeled cart any commercial article on display in the store, without intervention nor direct monitoring by the store owner or store clerks. It is presumed that good faith will be followed by most of the customers, reporting at the check out counter to account and pay for the commercial goods removed from the store shelves before leaving the store. It is believed by store operators that the increased volume of sales due to convenience to the customer, and decreased overhead costs due to lower labour requirements, has made such a modern commercial operation a more efficient one compared to the 19 th  century system.  
           [0004]    However, in the commercial retail business, “the shrinkage”, or percentage loss to shoplifters of unpaid commercial goods, is a growing preoccupation. Various ways of mitigating this problem have been developed, particularly in the last twenty years or so, to address this problem. One such solution is the installation of gates at the stores doors, with opto-electric sensors sensitive to markers embedded into the commercial goods. Another type of theft mitigation device is a type of ink clamp, used in particular in clothing stores, that will stain with ink, automatically or in a time deferred fashion, the piece of clothing if this piece of clothing is brought outside the store without proper official clearance. Another way of controlling shoplifting for small, low-cost items is to place them close to the check-out counter, so that the customer will be in the line of sight of the clerk at the counter, and thus should be deterred from attempting to perform shoplifting.  
           [0005]    Such known theft mitigating solutions are used for large and/or expensive items, such as lounge suits or kitchen appliances, or for cheap items, but may not be deemed cost-effective for small items of intermediate cost such as cigarettes or razor deemed cost-effective for small items of intermediate cost such as cigarettes or razor blades. In fact, small but still somewhat relatively expensive articles, such as razor blade cartridges, are more and more the target of shoplifters, since these articles can be discreetly removed from the retail outlet displays and concealed from the check out clerk by a shoplifter leaving the store without paying. An important proportion of retail stores operate on very small margins, and thus a shrink rate of even a small percentage, for example 2% of the value of all sales for a given period, can significantly affect the bottom line.  
         OBJECT OF THE INVENTION  
         [0006]    The gist of the invention is thus to provide means to further control the problem associated with shoplifting of small but relatively expensive commercial goods in retail stores.  
         SUMMARY OF THE INVENTION  
         [0007]    In view of the object of the invention, there is disclosed a shoplifting deterrent system for use in commercial retail stores, said system comprising:—a cabinet unit, defining a main wall having an access mouth opening into an enclosure, said enclosure for receiving a stack of superimposed commercial articles for sale;—a drawer, including a front door, sized for closing said access mouth in a closed condition of said drawer, and a slider base panel, transversely rearwardly extending from said door integrally thereto, said slider panel for supporting a single commercial article from the stack thereof and for enabling withdrawal of this single commercial article from said cabinet unit once said drawer reaches an extended open condition;—retaining means, slidingly interconnecting said slider base panel against a portion of said cabinet unit peripheral wall and positioning said door in register with said access mouth;—a fore and aft extending stricker pad, anchored to said cabinet unit, said pad having a knurled surface area; and—a clicker spring member, transversely anchored to said slider panel and defining a free end tongue, said clicker spring member being positioned so that said free end tongue thereof frictionally engages a portion of said pad knurled surface area; wherein upon said drawer being manually pulled outwardly from said cabinet unit, a loud noise is generated by said clicker spring member free end tongue scraping said pad knurled surface area.  
           [0008]    At least a few additional ones of said cabinet unit and said drawer may be added, each with an associated said clicker spring member, said retaining member and said stricker pad, and a bracket mount assembly operatively serially interconnecting all of such cabinet units. Said bracket mount assembly could include means for anchoring all of said cabinet units to an upright wall spacedly over ground.  
           [0009]    Said retaining means could consist of a pair of elbowed flanges, integrally projecting from said cabinet unit main wall, each of said flanges defining a lip spacedly extending over said a portion of said cabinet unit main wall, wherein a channel is defined between each said lip and a registering portion of said cabinet unit main wall, each of said channel slidingly engaged by opposite side edge portions of said slider panel.  
           [0010]    Preferably, biasing means are provided to continuously bias said drawer to its said closed condition. In one embodiment, said biasing means would include a reel member, a mount rotatably mounted to said cabinet unit main wall, and an elongated spring band being spring-loaded in winded condition around said reel member and having an inner end anchored to said reel member and an outer end anchored to said drawer slider.  
           [0011]    Said clicker spring member free end tongue is preferably curved by half a turn, to form an arcuate tongue.  
           [0012]    In one embodiment, said knurled surface consists of a succession of concave grooves.  
           [0013]    The shoplifting deterrent system may also further include:—a gate member,—slider mount means mounting said gate member to said cabinet unit main wall above adjacent said access mouth for displacement of said gate member between a first limit position, clearing said access mouth, and a second position, partially closing said access mouth,—locking means releasably locking said gate member into a selected one of said first position and said second position, wherein only one commercial article at a time can pass through said access mouth when said drawer is extended outwardly from said cabinet unit in said open condition thereof.  
           [0014]    The invention also relates to a sound alert device for use with a drawer extendible from a cabinet unit, said sound alert device constituting sound cue means that the drawer is extended from the cabinet unit, said sound alert device comprising:—a deformable elastic member having an intermediate section, an inner end portion and an outer end portion, both said inner end portion and outer end portion integral to said intermediate section, said outer end portion forming a free stricker end tongue;—an anchor member, for anchoring to a portion of the drawer, said inner end portion of said elastic member being anchored to said anchor member; and—an anvil member, for anchoring to a portion of the cabinet unit, said anvil member having an uneven anvil surface, said anvil member being located relative to said anchor member in such a fashion that said elastic member free stricker end tongue continuously frictionally engages said uneven anvil surface; wherein a clicker spring noise is generated from scraping action of said stricker end tongue against said uneven anvil surface upon the drawer being extended from the cabinet unit.  
           [0015]    Said uneven anvil surface may be knurled, for example made from a plurality of successive concave grooves made into said anvil member, said concave grooves extending in a direction transverse to that of said stricker end tongue.  
           [0016]    Said stricker end tongue could form a smooth surfaced convex bulge. 
       
    
    
     DESCRIPTION OF THE DRAWINGS  
       [0017]    In the annexed drawings:  
         [0018]    [0018]FIG. 1 is a perspective partial view of a set of plurality of interconnected display cases;  
         [0019]    [0019]FIG. 2 is a partly sectional, partly broken, front elevational view, at an enlarged scale, of a left hand side portion of the set of display cases of FIG. 1;  
         [0020]    [0020]FIG. 3 is a partly broken, lateral side end view, at an enlarged scale, of the left hand end portion of the set of display cases of FIG. 1, suggesting in phantom lines how a display case door can be opened from its closed condition shown in full lines;  
         [0021]    [0021]FIG. 4 is a cross-sectional view taken alone line IV-IV of FIG. 2, showing in phantom lines a stack of superimposed commercial articles for sale inside the display case housing;  
         [0022]    [0022]FIG. 5 is a sectional view taken along line V-V of FIG. 4;  
         [0023]    [0023]FIGS. 6 and 7 are bottom plan views of one display case from the set of display cases of FIG. 1, at a scale similar to that of FIG. 4 or  5 , and sequentially showing how the drawer thereof can be opened and how the clicker/spring travels along concurrently therewith; and  
         [0024]    [0024]FIG. 8 is a partial, exploded, partly broken perspective view of the anchoring bracket mount at one end of the display case set of FIG. 1. 
     
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS  
       [0025]    An assembly of display case units is shown as  10  in FIGS.  1 - 4 . Each display unit  12 ,  12 ′,  12 ″, . . . is of a make similar to the other ones. Display unit  12  includes a box-like container  14 , having a pair of opposite lateral side walls  16 ,  18 , a top wall  20 , a back wall  22 , a flooring  24  for supporting inside the thus formed enclosure  26  at least a few commercial identical goods G, G′, G″, G′″, . . . in superimposed fashion, and a front open access mouth  28 . Enclosure  26  is sized to freely receive a superimposed stack of goods G, G′, . . . in manually fed fashion through access mouth  28 . Flooring  24  includes an intermediate window  24 A extending forwardly from back wall  22  to a point short of the plane intersecting front access mouth  28 . Hinge mounts  30 ,  30 , hingedly mount a door  32  to intermediate front edge portions of lateral side walls  16 ,  18 , for pivotal motion between a first limit closed condition, illustrated as  32  in full lines in FIG. 3, in which door  32  closes the upper portion of access mouth  28 , and a second opened condition, illustrated as  32 ′ in phantom lines in FIG. 3, in which door  32  clears the upper portion of access mouth  28 .  
         [0026]    Door  32  preferably has a sealed front subcompartment  34 , with a frontmost transparent panel portion  34 A. Subcompartment  34  is destined to accommodate a single commercial item display, not shown, to show off and enable a customer to readily inspect one example of the plurality of commercial goods on sale inside the container  14 .  
         [0027]    A lock member  36  releasably interlocks the top end portion of door  32  to the upper edge portions of lateral side walls  16 ,  18 , to prevent unauthorized access into enclosure  26 . Lock member  36  may include for example a barrel  38  with a front axial keyslot  38 A, and with an integral rear transverse tab  40  pivotally movable between an upright position (not shown), engaging a registering corner slot  42  made in the front portion  20 A of top wall  20 , and a horizontal position  40 ′, shown in FIGS. 1 and 3, having released slot  42  but engaged another corner slot  44  made into the upper lateral side edge portion  32 A of door  32 . Wall front portion  20 A and door side edge portion  32 A may each be reinforced by integral reinforcement strips  46 ,  48 , respectively.  
         [0028]    Box like container  14  and door  32  are made from rigid sheet material, for example, rigid PVC sheets. Transparent door panel  32 A is made for example of transparent plastic. Reinforcement strips  46 ,  48 , and lock barrel  38  are made from a stronger material, e.g. a metallic alloy.  
         [0029]    A drawer  5 ′ (FIGS.  6 - 7 ) is provided for sliding engagement beneath flooring  24 , and to releasably close a lower free window  28 A of front access mouth  28  below door  32 . An identification socket  50  forms the front wall of drawer  52 . The purpose of socket  50  is for releasably receiving and retaining a paper or cardboard identification sheet (not illustrated), in the known fashion, for providing the usual commercial information about the product offered for sale: type, unit price, etc. . . . Drawer  52  further includes a floor or base panel  54  slidingly retained against the underface of the main display unit casing flooring  24  by inturned flanges  17 ,  19 . These flanges  17 ,  19 , transversely project toward one another from the bottom edges of side walls  16 ,  18 . The rear end of floor panel  54  includes an integral, central transverse tab  54 A, extending upwardly through and beyond the flooring window  24 A. The purpose of transverse tab  54  is that, during opening of the drawer  52 , tab  54  will hook a commercial good specimen G (the lowermost of the stack) standing on flooring  24 , and will bias forwardly this good specimen G away from back wall  22 , through and beyond passageway  28 A to slide and fall from main casing flooring  24  to the opened drawer base panel  54 . A customer may then grasp and retrieve the selected specimen G from drawer  52 , since the drawer base panel  54  projects outwardly from cabinet  14 . This will also allow the next in line good specimen G′ from the stack to fall down onto flooring  24 , since the originally selected good G has to be replaced.  
         [0030]    The inner edge of flange  17  facing opposite flange  19 , at  17 A, is knurled, for a purpose later set forth. The knurling of knurled inner flange edge  17 A is preferably, as shown in FIG. 6, a succession of concave, transverse grooves in a non-sinusoidal pattern; however, inner flange edge  17 A could be of any other irregular shape, not excluding a wavy surface, or even simply a coarse grade planar material surface.  
         [0031]    A frontwardly downwardly inclined elbowed handle  56  may be provided to the bottom edge of identification socket  50 , to facilitate handling (pulling) of drawer  52  relative to the main unit container  14 .  
         [0032]    Beneath subcompartment  32 , there is thus formed a passageway  28 A (FIG. 4) sized in height and width to enable passage of only one commercial good G at a time, i.e. the good G at the bottom of the stack of goods G, G′, . . . inside enclosure  26 . When drawer  52  is closed (FIG. 4), panel  50  extends through and closes passageway  28 A. However, when drawer  52  is opened (FIG. 7), panel  50  releases passageway  28 A so that one specimen of good G may pass from enclosure  26  to the outside for grasping by a customer and retrieval thereof.  
         [0033]    Preferably, adjustment means  90  (FIG. 4) are provided to adjust the height of lower passageway  28 A, to take into account the specific size of the type of specimen of good. Adjustment means  90  may for example include a gate  92 , slidingly carried against the back wall  34 B of subcompartment  34 . Gate  92  may for example include a slit  92 A, through which slidingly engages a bolt  94  projecting transversely from back wall  34 B. A wing nut  96  enables the operator to tighten bolt  94 , and thus, to frictionally lock gate  92  at a selected height relative to flooring  24 , to partially close window  28 A conformingly with the required size of commercial good G that needs to pass through passageway  28 A, only one at a time.  
         [0034]    A number of containers  14 ,  14 ′,  14 ″, . . . may be serially interconnected, as shown in FIG. 1, by a U-shape bracket  58  having a web  58 A, anchored to each of the back walls  22  of all box-like containers  14 , and two opposite short legs  58 B,  58 B, anchored to the two exposed lateral side walls  16 ,  18 , of the opposite ends containers  14 ,  14 . Each pair of adjacent containers  14 ,  14 , are also preferably anchored to one another by their facing adjacent side walls  16 ,  18 , by rivets  59  (FIG. 2). Bracket  58  may be for example of the type enabling anchoring of the assembly of display case units,  10 , to an upright building wall, spacedly over ground.  
         [0035]    As best shown in FIGS. 6 and 7, an elongated but relatively narrow metallic leaf spring  60  may be anchored at one end  60 A to an anchor block  62  fixedly connected to the underface of one rear corner portion of drawer panel  54 , proximate slide flange  19 . The leaf spring  60 , which may be for example rectangular, further includes a free outer end tongue  60 B. Preferably, outer end tongue  60 B is curved to form a half a turn arcuate tongue. Leaf spring  60  is sized so that arcuate tongue  60 B remains in frictional engagement transversely with knurled surface  17 A of slide flange  17 . As the drawer panel  54  is pulled slidingly along slider rails  17 ,  19 , away from back wall  22 , the arcuate tongue  60 B of leaf spring slides along the knurled surface  17 A of flange  17 , gliding through the concave troughs but jumping from one trough to the next successive one. As the leaf spring arcuate tongue  60 B jumps from one trough to the next one, a clearly audible clicking noise is generated, as the leaf spring  60  is elastically deformed in the process. As such, the leaf spring  60  thus act as a clicker/spring mechanism. Thus, such repeated clicking noise constitutes a clue to the store clerk that the drawer  52  has been opened.  
         [0036]    Preferably, and as best shown in FIGS. 4, 6 and  7  of the drawings, there is provided biasing means  80  to continuously bias drawer  52  towards its closed condition illustrated in FIG. 4. Biasing means  80  may include for example a reel  82  with an elongated metallic leaf spring-loaded strip  84  wound therearound, the reel  82  rotatably mounted at mount  85  to the bottom edge portion of back wall  22 . Leaf strip  84  is anchored at its inner end to reel  82 , and also anchored at its outer end to the rear edge portion of drawer  54 , for example by forming a permanent short loop  84 A through a small aperture  54 B made at the rear edge portion of drawer  54 . Since leaf strip  84  is spring-loaded, there is continuous bias applied by strip  84  about reel  82  to wind the reel  82  fully.
A display case having a plurality of compartments with a front covering closing them. A bottom slide dispenses one article at a time, from the bottom of each compartment. As the slide moves, it makes a loud noise to tell the store clerk that someone is dispensing a product. A would-be thief is thus placed on guard that his or her activity is being monitored by the check-out clerk, even if the thief is beyond the line of sight of the clerk.