Patent Abstract:
An appliance drawer construction allows, upon the press of a button, the extension of the drawer from a housing. At the same time, inadvertent unintended opening caused, e.g., by a person&#39;s body brushing past or up against the appliance, may be avoided. In another aspect, the invention provides a simple and effective latch release linkage which is particularly well suited to a drawer, like a laundry washer additives dispenser drawer, that requires an offset of the latch from the operation push-button, due to the placement of an additive storage compartment portion of the drawer directly behind the front console of the drawer, and the space constraints within the housing that receives the drawer.

Full Description:
BACKGROUND OF THE INVENTION 
     The present invention relates to appliance drawer constructions, and particularly to constructions of additive dispenser drawers used in washing appliances, such as automated laundry washing machines. 
     Automated washing machines (such as laundry washing machines) often include mechanisms for dispensing additives into a washing chamber (e.g., a drum of a laundry washing machine). Such dispenser drawers typically contain receptacles for holding and dispensing different additives, which can include detergents, whiteners, fabric softeners, scents, rinse aids, etc. Typically, a user fills a dispenser chamber with one or more additives. At selected times during a wash cycle, water is then automatically introduced into the dispenser chamber and mixes with the additive. The water/additive mixture then flows out of the dispenser drawer and into a separate washing chamber, e.g., drum. 
     An example of a drawer-style additive dispenser is illustrated and described in commonly-owned U.S. Patent Application Publication No. 2004/0011089 (titled “Washing Aid Dispenser and Washing Machine Comprising Said Dispenser”). Access to the drawer by the user is obtained by withdrawing the drawer from an associated dispenser housing provided within the appliance cabinet. Typically, the drawer slides in and out of the dispenser housing along guideways provided on opposite sides of drawer, and on corresponding sides of the cavity that receives the drawer. The drawer is retracted manually, and no separate latching mechanism is generally provided, since the friction between the mating surfaces of the drawer and the dispenser housing, along with the generally horizontal orientation of the guideways (in the typical level appliance installation), are sufficient to retain the drawer in the desired extended or retracted position. 
     PGP US 2006/0162392 discloses a dispenser additives drawer with frictional slide glides, and also having a stopper and elastic slot that serve to releasably hold the drawer in its fully inserted position. 
     U.S. Pat. No. 6,865,911 discloses a childproof lock/latch mechanism in a washer additives dispenser drawer. 
     Apart from laundry additive dispenser drawers, other mechanisms are known which cause release of a drawer, or opening of a door. See, e.g., U.S. Pat. No. 7,188,871 (push-button of glove box releases a latch, which allows a spring to bias the closure lid open); U.S. Pat. No. 5,002,074 (push-push ashtray drawer with spring to bias drawer to extended position); and U.S. Pat. No. 4,875,721 (push-button released door of microwave range). 
     In a modern trend, laundry appliances are taking on a more prominent stylistic role in the home. Along with this, greater emphasis is being placed on convenience, user friendliness and the “look and feel” of laundry appliances. An additive dispenser drawer that operates more smoothly and easily than the existing dispenser drawers would be a significant improvement in this regard. 
     SUMMARY OF THE INVENTION 
     Aspects of the present invention provide an appliance drawer construction of improved operability, allowing, upon the press of a button, the extension of the drawer. At the same time, inadvertent unintended opening caused, e.g., by a person&#39;s body brushing past or up against the appliance, may be avoided. In another aspect, the invention provides a simple and effective latch release linkage which is particularly well suited to a drawer, like a laundry washer additives dispenser drawer, that requires an offset of the latch from the operation push-button, due to the placement of an additive storage compartment portion of the drawer directly behind the front console of the drawer, and the space constraints within the housing that receives the drawer. 
     The above and other objects, features and advantages of the present invention will be readily apparent and fully understood from the following detailed description of preferred embodiments, taken in connection with the appended drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a front perspective view of a front load automatic laundry washer, including a push-button actuated additives dispenser drawer in accordance with an aspect of the invention. 
         FIG. 2  is a right front side perspective view of the exemplary additives dispenser drawer shown installed in  FIG. 1 . 
         FIG. 3  is a right rear side partial perspective view of the exemplary additives dispenser drawer. 
         FIG. 4  is an exploded perspective view showing an assembly of parts of the exemplary additives dispenser drawer. 
         FIG. 5  is a partial bottom plan view, partially in section, of the exemplary additives dispenser drawer. 
         FIG. 6  is a partial bottom plan view of the additives dispenser drawer, with a portion cut-away to reveal components of the latch assembly thereof. 
         FIG. 7  is a longitudinal cross-sectional view of the additive dispenser drawer (front console omitted) received within the mating cavity of a housing of the additives dispenser. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Referring to  FIG. 1 , illustrated is an exemplary laundry washing appliance (machine) of the front-load, rotating drum variety. The washing machine includes an assembly of a drawer  1  and a housing  3  having a cavity that receives the drawer alongside a control panel  4  of the appliance. The drawer is extensible out of the housing to permit a user access to additive retention compartments of the drawer. Glides  6  (see  FIG. 2 ) may extend along the sides of drawer  1  for making mating contact with corresponding bearing surfaces of the housing. This contact may comprise a sliding contact and/or a rolling contact, e.g., as may be provided by roller bearings. Incorporated into the housing, above the cavity, is an overhead water distribution tray  2  (see  FIG. 7 ) for selectively delivering water into the drawer, in a generally known fashion. The assembly further includes a latch mechanism that serves to retain the drawer in the illustrated position, fully advanced into the housing. The latch mechanism includes a user operable latch release actuator, which may be a push-button  5  as shown. Referring to  FIGS. 3-6 , the latch mechanism further includes a first hook-like catch  7  carried by the drawer  1 . Catch  7  is biased into engagement with a mating second catch  9  (see  FIG. 6 ) provided on the housing, when the drawer is advanced into the housing (e.g., to the position shown in  FIG. 1 ). Catch  9  may be provided in the form of an under-cut surface or the like, with a tapered guide surface adjacent thereto, for slidably guiding the first catch  7  into engagement with second catch  9  as drawer  1  is advanced fully into housing  3 . 
     Push-button  5  is operably connected with first catch  7  so as to effect a disengagement of first catch  7  from second catch  9  upon being pressed. In particular, as shown in  FIG. 5 , the rear surface of push-button  5  engages with a laterally offset portion of a pivotably mounted linkage member  11 . As button  5  is pressed, linkage member  11  rotates (counterclockwise in  FIGS. 5 and 6 ). Referring to  FIG. 4 , linkage member  11  comprises a generally vertically extending, rib-reinforced, arcuate plate portion  13 . An arm  15  extends rearwardly from vertically extending portion  13 . Plate portion  13  has, on top and bottom flanges thereof, stub axles  14  (see FIG.  4 —only one visible) received in corresponding slots  16  (only one visible) to provide the pivotal mount. First catch  7  is provided at a rearward end of arm  15  such that upon pivotable movement of linkage member  11 , caused by a press of push-button  5 , first catch  7  swings through a generally horizontal arc away from (and out of engagement with) the second catch  9 . 
     A coil tension spring  17  is attached between the linkage member  11  and a side portion  19  (see  FIGS. 4 and 5 ) of the drawer  1 , to bias linkage member  11  for pivotal movement that moves first catch  7  into engagement with the second catch  9 . Spring  17  also preferably preloads push-button  5  by pressing linkage member  11  against the rear side of push-button  5 , thereby avoiding undesirable looseness or play between these components. A press of push-button  5  acts to pivot linkage member  11  against the spring bias to thereby cause the first catch  7  to disengage from the second catch  9  during the time that the button is pressed. Upon release of button  5 , first catch  7  is returned to its original angular orientation, which may or may not be in engagement with second catch  9 , as will be explained. 
     The assembly further comprises a bias mechanism  20  (See  FIG. 7 ) for biasing drawer  1  to move at least partially out of housing  3  upon a press of push-button  5 , under a condition that the drawer is not blocked from moving outwardly. As seen in  FIG. 7 , bias mechanism  20  may comprise a compression spring  21  mounted upon a cylindrical guide rod  23  positioned in housing  3  behind inserted drawer  1 . Guide rod  23  is mounted so as to allow limited axial movement of the rod forwardly and rearwardly. A rearward end of spring  21  abuts against an oppositely facing seat  24  provided at an upper rearward part of housing  3 . The forward end of spring  21  is seated on a forward enlarged diameter portion of rod  23 , such that spring  21  biases rod  23  axially outwardly to a position that places a forward end of guide rod  23  in contact with a rear push-surface  25  of drawer  1 , when the drawer is fully advanced within the housing. This contact, upon full advancement of the drawer into the housing, also displaces rod  23  rearwardly against the bias of compression spring  21 , so as to preload the spring to bias rod  23 , and hence drawer  1 , outwardly. As a result, upon disengagement of first catch  7  from second catch  9 , the drawer will extend at least partially from the housing—so long as nothing is blocking it from doing so. 
     Under the aforesaid condition that the drawer is not blocked from moving outwardly, a spring-biased return of first catch  7  to its original angular orientation (upon a release of push-button  5 ) will not cause a reengagement of first catch  7  with second catch  9 . Thus, drawer  1  will remain free to be manually extended further out of the housing to allow a user full access to the additive storage compartments of the drawer. On the other hand, in a condition that drawer  1  is blocked from moving outward at a time that push-button  5  is pressed, first catch  7  remains in a position to be biased back into engagement with second catch  9  upon a release of push-button  5 , whereby the drawer remains secured within housing  3 . 
     The foregoing arrangement is of highly significant functional consequence. Namely, it can serve to avoid a situation where a person brushing by or up against the appliance inadvertently cause the drawer to open (move outwardly). With an occurrence of “brush-by,” it is possible that push-button  5  will be depressed, i.e., pushed inwardly causing a disengagement of the mating catches  7 ,  9 . However, during this time, the person&#39;s hip or other body portion that inadvertently pressed button  5  will also typically be positioned so as to block drawer  1  from moving outwardly. Thus, in this condition, first catch  7  will remain in a position to be reengaged with second catch  9  upon a release of button  5 , and thus drawer  1  will advantageously be retained in its latched, retracted position. The principal operative forces are diagrammatically depicted by arrows A-C in  FIG. 2 . Arrow A represents the pressing force on button  5 . Arrow B represents the reaction force of a body portion resisting the outward bias force C generated by bias mechanism  20 . Reaction force B is equal and opposite to bias force C, and thus the drawer is maintained stationary in its retracted position, despite a release of first catch  7  from second catch  9  by virtue of button-pressing force A. 
     The latch mechanism is preferably configured to permit the drawer to move sufficiently outwardly relative to push-button  5 , upon disengagement of first catch  7  from second catch  9 , to prevent a reengagement of the first catch with the second catch upon a user&#39;s release of push-button  5 . In the illustrated arrangement, a press of button  5  causes an initial pivot of linkage member  11  sufficient to release first catch  7  from second catch  9 . Thereafter, further rearward displacement of push-button  5  relative to drawer  1  is permitted to at least partially absorb the outward movement of drawer  1  caused by bias mechanism  20  upon a release of first catch  7  from second catch  9 . In this manner, a press of push-button  5  by a user does not, by itself, inhibit a release of the drawer allowing it to be thereafter fully extended from the housing. 
     In the illustrated laundry washing machine additive dispenser drawer embodiment, the push-button actuator  5  is positioned on a front face or panel of a front console  26  of drawer  1 . As seen in  FIG. 2 , elevation-wise, button  5  is positioned generally centrally at least partially above a bottom of the drawer compartment structure  28  attached at the rear side of console  26 , through an intermediate joining member  30  of generally rectangular tubular shape. The first and second catches  7 ,  9  are vertically offset below the push-buttons so as to be positioned, elevation-wise, at least partially below the bottom of the drawer compartment. This offset is accomplished simply and effectively by way of the described arrangement of push-button actuator  5  and linkage member  11 , including vertically extending portion  13  and arm  15 . Such an arrangement advantageously permits the push-button to be positioned centrally on console  26  directly in front of the drawer compartment structure  28 , while allowing the catches of the latch to be positioned where they can best be accommodated within the tight confines of the housing  3 . As best seen in  FIGS. 4 and 5 , in the illustrated embodiment, arm  15  extends through an aperture  32  provided in a vertical step portion of joining member  30 , to position catch  7  at a backside thereof, below a floor portion  34  of joining member  30 . Mating second catch  9  may be provided within a depth-wise extending channel of a front console of housing, which aligns with aperture  32  upon insertion of drawer  1 . In addition to lending additional structural rigidity to the console, such a channel can serve to provide a protective enclosure around the mating catches. So positioned, the mating catches may be protected and further concealed from view of the user. In addition, such an arrangement can serve to avoid fouling of the catch mechanism by spillage of additives poured into the drawer compartments. 
     In the illustrated embodiment, the housing is a housing that receives the drawer of an automated laundry washing machine, and the drawer is an additive dispenser drawer thereof. It will be understood, however, that aspects of the invention may be applied to other automatic washing appliances, e.g., dishwashing machines, and to appliance and other storage drawers in general. 
     The present invention has been described in terms of preferred and exemplary embodiments thereof. Numerous other embodiments, modifications and variations within the scope and spirit of the appended claims will occur to persons of ordinary skill in the art from a review of this disclosure.

Technology Classification (CPC): 3