The present application is the U.S. counterpart of PCT/FR2009/050621 and claims priority to French application Ser. No. 08/52392 filed on Apr. 9, 2008, French application Ser. No. 08/56399 filed on Sep. 23, 2008, and French application Ser. No. 08/58741 filed on Dec. 17, 2008, the entire contents of each of which are hereby incorporated herein by reference.
I. Field of the Invention
The present invention relates to a shelf for supporting articles, which is intended to be fastened or fitted, advantageously so as to be able to be removed, in the body of an item of furniture. In particular, the invention relates to a shelf that can be used in refrigerated compartments, such as refrigerated cabinets, refrigerating apparatus and refrigerators, for supporting articles, particularly food.
II. Description of Related Art
These shelves consist of solid plates made of mineral glass or organic glass, such as polycarbonate or polymethyl methacrylate, whether monolithic or laminated and whether transparent, translucent or opaque, these being provided with a plastic surround, whether complete or partial, obviating the risk of injury on the sharp edges of the plates and/or strengthening said plates.
Moreover, the edges of the plastic surround may be straight and uniform, or of more complex shape, possibly having in particular peripheral parts or extensions for functional or esthetic purposes. Thus, the front edge may form a handle for gripping the shelf and the lateral and rear edges are generally designed to cooperate with the body of the furniture, said body generally bearing racks for supporting the shelves, or supporting grooves or ribs in the side walls.
There are various assembly methods for joining the plastic surround to the glass panel: by encapsulation molding; by attaching a surround to the panel, for example by bonding, clip-fastening or interlocking the sides of the surround; or by shrinking the surround just after molding, the panel being in this case joined to the surround just after leaving the mold, before the plastic has completely shrunk.
These shelves are satisfactory through their practical and attractive shapes, and also by the fact that the assembly methods, in particular shrinkage methods, make it possible to achieve good consolidation and, where appropriate, good sealing between the glass panel and the plastic surround.
The present invention pertains to shelves for which the plastic surround encloses the edges or edge sides of the panel, especially by the plastic shrinking, such shelves having been disclosed by the filing company in the PCT international applications WO 02/076268 A1 and WO 06/059038 A1.
The surrounds of the shelves thus disclosed comprise at least one inward rim applied to the article support panel on at least one of the two faces of the panel. In practice, an inward rim is applied over the entire perimeter of the upper face of the panel, when considered in the use position. In this way, if any liquid flows out from food items placed on the shelf, it is retained by the vertical end border of this rim. In addition, beneath the lower face of the panel when considered in the use position, several rims of the surround are applied, these taking the form of rigid retaining lugs distributed over the entire perimeter of the panel.
In fact, these retaining lugs could be dispensed with, in particular if the frame is shrunk onto the panel, but it is preferable to provide them for safety reasons.
However, during manufacture, these retaining lugs, molded with the panel surround, prove to be problematic.
In most cases, the panel can be put into place without touching the aforementioned lugs, in particular if this operation takes place very rapidly after the frame leaves the mold and therefore within a period when the frame has practically not yet shrunk upon cooling.
However, in other cases, shelf manufacture requires a handling operation, this being all the more tricky the hotter the frame and since the lugs are rigid. As a result therefore, it is impossible to automate the insertion of the glass panel into the plastic frame.
The object of the present invention is to remedy these drawbacks, by providing a shelf for an item of furniture, especially for a refrigerator or the like, which has a rigidity suitable for its function and of which the method of manufacturing is simple and can, for the most part, be automated.
For this purpose, one subject of the invention is a shelf for an item of furniture, especially for a refrigerator or the like, comprising a panel for supporting articles and a frame capable of enclosing the panel by its actual surrounding part, the frame being designed to allow the shelf to be fitted into the body of the furniture, the shelf further including at least one retaining member for retaining the panel at its lower part, wherein the retaining member can be inserted laterally into a hole made in a rib of the frame, which rib runs along the panel, being offset internally relative to the external peripheral edge of the frame, and extends beyond the panel, and then can be fastened onto or behind the border wall of the hole, the retaining member bearing, in the fastened position, against the panel.
Within the context of the invention, the term “frame” denotes a frame covering all the edges of the panel or covering only part of the edges of the panel.
Thanks to the invention, the lower face of the panel is retained by at least one retaining member which is a piece attached by the operator once the panel has been inserted into the frame. This insertion of the panel into the frame, which takes place without any difficulty insofar as it is possible to limit, or even eliminate, the presence of rims on the lower face of the frame liable to interfere with the sides of the panel, can therefore be automated.
According to other advantageous features of a shelf in accordance with the invention, taken individually or in any technically possible combination:
Another subject matter of the present invention is a method of manufacturing a shelf as defined above, which method comprises:
Advantageously, the or each retaining member is inserted into a hole of a rib of the frame before the frame has completely shrunk and via the internal side of the rib relative to the panel.
According to one embodiment, the panel is inserted into the still-hot frame by introducing the first side of the panel beneath the rigid rim of the first side of the frame and then depositing the panel between the other sides of the frame.
The final subject of the invention is an item of furniture, such as a refrigerated cabinet, a refrigerating apparatus or a refrigerator, comprising at least one shelf as defined above.
To better illustrate the shelf according to the present invention, particular embodiments thereof will be described below with reference to the appended drawings in which:
The shelf 1 comprises a rectangular panel 2 made of mineral or organic glass, provided with a frame 3 made of a relatively rigid plastic, such as polypropylene. The frame 3 is designed to allow the shelf 1 to be fitted into the body of the refrigerator, i.e. it includes fitting means suitable for cooperating with complementary means provided in the body of the refrigerator. The frame 3, of flattened parallelepipedal general shape, comprises an actual surrounding part, having a vertical internal wall 4 which defines a rectangular outline of greater height than the thickness of the glass panel 2 and which encloses the latter over its entire thickness when in the fitted position.
The distance between the wall 4 of the frame 3 and the edges of the glass panel 2 is small, in particular zero, at least in certain places, as results from the chosen method of manufacture, which will be described later and involves the frame 3 being shrunk around the panel 2 just after the frame 3 has been molded. This method of assembling the frame 3 with the panel 2 ensures that the assembly is held together and sealed.
On its upper face 3A and over its entire perimeter, the frame 3 forms an inward rim 5 of small thickness, which is intended to be applied against the upper face 2A of the glass panel 2, its free border being for example of rectangular shape with rounded corners, as shown in
The lower face 3B of the frame 3 is not smooth like the upper face 3A, but has, in its rear, right and left sides or border regions, cells 6 separated by ribs 7. This saves material in these regions, while still maintaining sufficient rigidity for the frame 3. These cells 6 and ribs 7 may be obtained by the technique referred to as “air molding”.
Such ribs 7 form an internal border of the rear, right and left sides or regions of the frame 3, their internal vertical faces being coincident with the internal face of the vertical wall 4 of the frame. These perimeter ribs are denoted by 7A in
To complete the description of the shelf 1 according to the invention, it may be pointed out that:
The role of these particularly shaped cut-outs on the edges of the shelf 1 depends on the body and on the structure (such as a rack) for supporting the shelf 1 in the refrigerator, and also on the method of inserting and removing it. Thus, it is common practice to ensure that, for safety reasons, the shelf cannot be entirely removed directly, but firstly withdrawn over only a part thereof. Since these cut-outs and details do not concern the present invention and are merely particular examples, they will not be described here further.
In accordance with the present invention, the shelf 1 comprises retaining members 14, 14D, for retaining the panel 2 in the frame 3 on its lower face 2B.
A first embodiment of a retaining member 14 of the shelf 1 is shown in
In other words, the retaining member 14 of this first embodiment is a plate having two end parts 16 and 17, the end part 16 being a tapered end part that can be inserted into the hole 15 in such a way that, in the configuration with the retaining member 14 in the hole 15, the parts 16 and 17 are immobilized on each side of the hole 15, bearing respectively against the lower face 2B of the panel 2 and the rib 7A, 7B in the case of the part 17 and against the rib 7A, 7B in the case of the part 16.
The second part 23 is intended to be inserted into the hole 15 and has a central slot 25, directed parallel to the central axis X14 and perpendicular to a free end edge 23L of the second part 23, which slot extends practically as far as level with the shoulders 22 and divides the second part 23 into two subparts 23a, 23b capable of coming closer together elastically. Shallow cavities 26a, 26b are formed in the upper part of each of the resulting subparts 23a, 23b, giving the part 23 a little flexibility.
Moreover, each of the two lateral edges 29 of the second part 23 is inclined toward the central axis X14, from the corresponding shoulder 22 to the free edge 23L, so as to facilitate the insertion of the member 14D into the hole 15. To insert it into the hole 15, the retaining member 14D is placed on the panel 2, then slid toward and forcibly pushed into the hole 15 via its second part 23, until catching thanks to the shoulders 22 delimiting the parts 23 and 24. In the configuration with the retaining member 14D in the hole 15, the first part 24 is immobilized and bears against the lower face 2B of the panel 2 and the rib 7A, 7B on one side of the hole 15, while the second part 23 is immobilized and bears against the rib 7A, 7B on the other side of the hole 15.
The first part 24 comprises a flange 27 formed on its upper face and intended, in the fitted position, to bear via a face 27a against the rib 7A, 7B, as clearly visible in
Irrespective of the embodiment in question of a retaining member of the shelf 1, the part 17 or 24 of the retaining member 14 or 14D, which is intended to bear against the lower face 2B of the panel 2, in order to retain the latter, is rigid and advantageously has a width l14 taken along the direction of the central axis X14 of the retaining member, i.e. along a direction perpendicular to the rib 7A, 7B of the frame 3 in the configuration with the retaining member in the hole 15 of this rib, greater than about 0.5 centimeters and preferably at least around 0.8 centimeters.
In addition, in the two embodiments described above of a retaining member of the shelf 1, the retaining member 14 or 14D is advantageously made of a polymer having good mechanical strength properties, such as ABS or HIPS (high-impact polystyrene) and formed by injection molding. Advantageously, the constituent material of the retaining member 14, 14D has a thermal expansion coefficient lower than the thermal expansion coefficient of the constituent material of the frame 3, this being the case for a retaining member 14, 14D made of ABS or HIPS and a frame 3 made of polypropylene. The choice of a material having a low thermal expansion coefficient ensures good rigidity of the retaining member 14, 14D.
The shelf 1 according to this first embodiment of the invention is obtained by forming the plastic frame 3 by hot molding, the glass panel 2 being assembled with the frame 3 as it leaves the mould before complete shrinkage of the plastic. Details relating to this shrinkage method of assembly (temperatures, duration of the steps, etc.) may be found in PCT international application WO 02/076268 A1 in the name of the filing company. The shrinkage of the frame 3 is at least 0.25%, advantageously between 0.5% and 2%, preferably around 1.5%, relative to the width and/or the length of the frame in its main plane, which is a plane parallel to the plane of the panel 2 in the assembled configuration. Such a percentage shrinkage of the frame 3 is obtained thanks to the suitable constituent material of the frame, which is polypropylene having a high melt flow index, at least equal to 20 grams/10 minutes.
A method of manufacturing the shelf 1 comprises steps such as those described below.
Firstly, the frame 3 still hot on leaving the mold is placed on a support. For example, the frame 3 is placed on the support via its face 3A, which includes the rim 5 and is intended to be the upper face of the frame 3 in the position in which the shelf 1 is used.
Next, the panel 2 is placed in the frame 3, before the latter has completely shrunk, from the side of the face 3B of the frame intended to be its lower face when in the position in which the shelf is used. The panel 2 is placed in the frame 3 while the frame is in a state sufficiently hot and expanded for there to be no interference between the internal wall 4 of the frame and the sides of the panel 2. Positioning the panel 2 is easy since, in this embodiment, the frame 3 does not have a rim on its lower face 3B.
The frame is then left to partially shrink around the panel 2. In this way, the assembly is consolidated, the frame 3 enclosing the panel 2 thanks to the internal wall 4, which is provided with a height greater than the thickness of the panel 2 and which encloses the panel over its entire thickness.
Once the frame 3 has partially shrunk, but preferably before it has completely shrunk, the panel 2/frame 3 assembly is strengthened and locked, for safety reasons, by fitting, as described above, at least one retaining member 14 or 14D. This fitting operation is generally carried out once the frame 3 is in position enclosing the panel 2. For this purpose, the or each retaining member 14, 14D is inserted into one of the holes 15 of the ribs 7A, 7B of the frame 3, by applying a thrust force on the part 17 or 24 of the member, in such a way that the part 17 or 24 of the retaining member is immobilized and bears against the lower face 2B of the panel 2 on a first side of the hole 15 and the part 16 or 23 is immobilized and bears against the rib 7A, 7B on the other side of the hole 15 in the configuration with the retaining member in the hole 15.
The constituent material of the frame 3 continues to cool down, and therefore shrink, thereby, on the one hand, increasing the clamping force of the retaining member(s) 14, 14D, making it very difficult to remove it/them, and, on the other hand, further consolidating the frame 3/panel 2 assembly and improving the sealing between them. This has great practical importance since the shelf 1 is intended to support food products that may spread out and slip into the plastic/glass join regions, to the detriment of proper use of the refrigerator.
Particularly advantageously, the or each retaining member 14, 14D is inserted into the hole 15 via the internal side of the rib 7A, 7B relative to the panel 2. It follows that the gripping part 17 or 24 of the retaining member is housed behind the rib 7A, 7B. Such an arrangement makes it difficult to extract the retaining member from the hole in the configuration in which the shelf 1 is used and helps to secure the locking of the panel 2 onto the frame 3. Furthermore, as shown in
In the second embodiment shown in
The frame 103 forms, on its upper face 103A and over its entire perimeter, an inward rim 105, of small thickness, shown by the dotted lines in
The frame 103 of the shelf 101 in accordance with this second embodiment differs from the frame 3 described above in that the front side 1031 of the frame 103, intended to face the edge of the front side 1021 of the panel 102, includes a rigid rim portion 135 designed to bear against the lower face 102B of the panel. The rim 135 has a width l135, along a direction Y perpendicular to the first side 1031 of the frame 103, greater than about 0.5 centimeters, preferably between about 0.8 centimeters and about 1 centimeter. The rim 135 delimits, with the wall 104 and the rim 105, a groove 137 for accommodating the front side 1021 of the panel 102. As shown in
In addition, the right and left lateral sides 1032, 1034 of the frame 103, which are intended to face the edge of the right side 1022 and the edge of the left side 1024 of the panel 102 respectively, each have a rim 139 designed to bear against the lower face 102B of the panel. Each of the rims 139 has a width l139, along a direction X perpendicular to the lateral sides 1032, 1034 of the frame 103, less than about 0.5 centimeters and preferably between about 0.2 centimeters and about 0.3 centimeters. These widths of the rims 139 are determined so as to be compatible with the percentage shrinkage of the frame 103, which is at least 0.25% relative to the width and/or the length of the frame in its main plane, this shrinkage being, as in the first embodiment, advantageously between 0.5% and 2%, preferably around 1.5%, so that the lateral rims 139 of the frame 103 do not touch the lateral sides 1022 and 1024 of the panel 102 when the latter is being placed in the still-hot frame 103 and therefore do not interfere with said sides of the panel. Thus, the lateral rims 139 enable the panel 102 to be placed in the frame 103 without any obstacle, but also help to stabilize the panel 102 in the frame 103 once the frame has shrunk, by forming, with the wall 104 and the rim 105 of the frame, lateral slideways for accommodating the lateral sides 1022 and 1024 of the panel.
Moreover, the rear side 1033 of the frame 103, intended to face the edge of the rear side 1023 of the panel 102, has a rib 107A, which runs along the panel 102, being internally offset relative to the external peripheral edge of the frame 103, and projects relative to the lower face 102B of the panel when the frame encloses the panel. As clearly visible in
As shown in
In the fitted position, each of the two retaining members 114 of the piece 108 is prevented from moving, along its axis X114, in one direction by the shoulders 122 and in the other direction by the flange 127 butted against the rib 107A. In particular, in the configuration in which the two retaining members 114 of the piece 108 are housed in both holes 115, the parts 124 and 123 of each member 114 are immobilized and bear respectively against the lower face 102B of the panel 102 and the rib 107A on one side of the hole 115, and against the rib 107A on the other side of the hole 115.
As described above, the first part 124 of each retaining member 114, which is intended to bear against the lower face 102B of the panel 102 in order to retain it, is rigid and has a width l114, taken along the central axis X114 of the retaining member, i.e. in a direction perpendicular to the rib 107A of the frame 103 in the configuration in which the retaining member 114 is in the hole 115 of this rib, greater than about 0.5 centimeters and preferably at least around 0.8 centimeters.
A method of manufacturing the shelf 101 in accordance with this second embodiment of the invention comprises steps as described below.
Firstly, the frame 103, still hot on leaving the mold, is placed on a support, for example in such a way that its face 103A, which has the edge 105 and is intended to be the upper face of the frame 103 in the position in which the shelf 101 is used, rests on the support.
Next, the panel 102 is placed in the frame 103, before said frame has completely shrunk, from the side of the face 103B of the frame which is intended to be its lower face in the position in which the shelf is used. For this purpose, the front side 1021 of the panel 102 is inserted beneath the rigid rim 135 into the groove 137 bounded by the front side 1031 of the frame 103, as shown in
Optionally, the panel 102 once in place between the sides of the frame 103 may be pushed back toward the bottom of the groove 137, i.e. toward the wall 104, as illustrated by the arrow F2 in
The frame 103 is then left to partially shrink around the panel 102. As in the first embodiment, the panel 102/frame 103 assembly is thus consolidated thanks to the internal wall 104 of the frame which is provided with a height greater than the thickness of the panel 102 and which encloses the panel 102 over its entire thickness.
Once the frame 103 has partially shrunk, but preferably before it has completely shrunk, the panel 102/frame 103 assembly is strengthened and locked, for safety purposes, by the insertion of the two retaining members 114 of the single piece 108 into the two holes 115 of the rib 107A on the rear side 1033 of the frame. This insertion is generally carried out once the frame 103 is in position enclosing the panel 102. The insertion of the two members 114 of the piece 108 into the two holes 115 is carried out by exerting a thrust force on each of the two recesses 128b of the piece 108, in the direction of the arrows F3 in
To give a nonlimiting example, in both the embodiments described above, the frame 3, 103 leaves the mold at a temperature of around 60° C. and it takes 24 hours after leaving the mold for it to be completely shrunk. However, the composition of the frame is adapted so that 80% of the frame shrinkage occurs within the 10 minutes following its removal from the mold.
Advantageously, the fitting of the panel 2, 102 into the frame 3, 103 then takes place as soon as the frame leaves the mold, at a frame temperature of around 40° C. to 60° C., preferably within a time of less than 5 minutes after it leaves the mold, whereas the fitting of the or each retaining member into a hole 15, 115 takes place when the frame is in position enclosing the panel, preferably while the frame has not yet fully shrunk, preferably within a time of less than 15 minutes after leaving the mold.
Thanks to the insertion of the or each retaining member 14, 14D, 114 into one of the holes 15, 115 of the ribs of the frame 3, 103, preferably before the frame has completely shrunk, the frame continues to shrink around the retaining member. This improves the clamping of the retaining member in the hole 15, 115.
As apparent from the embodiments described above, a shelf 1, 101 according to the invention has good rigidity. This is because the panel 2, 102/frame 3, 103 assembly of the shelf, obtained by the frame shrinking around the edges of the panel, is made secure by means of retaining the panel relative to the frame that act on the lower face 2B, 102B of the panel. These retaining means, consisting of the retaining members 14, 14D in the first embodiment and by the rim 135 and the retaining members 114 in the second embodiment, comprise parts bearing against the lower face 2B, 102B of the panel which are rigid enough and wide enough to avoid any risk of the panel being extracted from the frame. These parts bearing against the lower face 2B, 102B of the panel are designed not to be able to bent, without breakage, thereby preventing any deconsolidation of the panel relative to the frame by deformation of the bearing parts of the retaining means, even when a large weight is applied on the shelf.
Advantageously, the or each retaining member 14, 14D, 114 is shaped so as to be inserted into a hole 15, 115 via the internal side of the rib of the frame relative to the panel. As a result, the gripping part 17, 24 or 181 of the retaining member is housed behind the rib in the configuration in which the shelf 1, 101 according to the invention is used. Thus, there is little possibility of extracting the retaining member in this configuration in which the shelf is used, thereby making the panel/frame assembly more secure. The esthetics of the shelf 1, 101 are also retained as only restrained parts of the retaining members protrude from the external side of the rib relative to the panel, and these parts do not protrude relative to the external peripheral edge of the frame.
Furthermore, the method of manufacturing a shelf 1, 101 in accordance with the invention is simple and for the most part, can be easily automated. In particular, the step of placing the panel 2, 102 in the frame 3, 103, while it is still hot, before the frame has shrunk around the panel, may be carried out by a robot, especially by directly depositing the panel 2, 102 between the sides of the frame 3, 103, as in the first embodiment, or by inserting one side of the panel 2, 102 into a groove on one side of the frame 3, 103 and then by swinging the panel down between the other sides of the frame, as in the second embodiment. Advantageously, the second embodiment involves a limited number of operations for assembling the shelf, thanks to a limited number of retaining members to be inserted into the holes of the frame.
Of course, the embodiments described above have been given merely by way of indication and imply no limitation and modifications may be made without thereby departing from the scope of the present invention.
In particular, whatever the embodiment, several retaining members may be joined together to form a single piece equipped with several bars or branches each carrying a retaining member, the plurality of retaining members of the single piece being capable of simultaneously entering various holes drilled in the ribs of the frame enclosing the glass panel. In particular, such a single piece may run along all or part of the perimeter of the glass panel or equivalent. In addition, the or each retaining member of a shelf according to the invention may be welded or bonded to the frame after it has been fitted into its configuration in which the panel is locked relative to the frame of the shelf, i.e. in the configuration in which the member is housed in a hole of the frame. The panel 2, 102, once in place in the frame 3, 103, may also be bonded to the frame, especially, in the second embodiment described above, on its side housed in the groove 137 of the frame.
Moreover, in the embodiments described above, the insertion of the or each retaining member preferably takes place before the frame 3, 103 has completely shrunk. As a variant, this insertion may be carried out subsequently and, in this case, since the locking of each retaining member in the rib of the groove is less secure, it is advantageous to provide mechanical means suitable for preventing the retaining member from being extracted from the hole 15, 115 of the rib, for example saw teeth on the retaining member and/or the wall of the hole, these being directed so as to prevent extraction of the member.
As mentioned above, a shelf in accordance with the invention may also comprise either a frame covering all the edges of the panel, or part of a frame covering only certain edges, or part of the edges of the panel. In addition, in the first embodiment, the rib 7A, 7B of the frame may be formed so as to be discontinuous, and not continuous as shown in
Number | Date | Country | Kind |
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08 52392 | Apr 2008 | FR | national |
08 56399 | Sep 2008 | FR | national |
08 58741 | Dec 2008 | FR | national |
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PCT/FR2009/050621 | 4/8/2009 | WO | 00 | 5/12/2009 |
Publishing Document | Publishing Date | Country | Kind |
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WO2009/136078 | 11/12/2009 | WO | A |
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