Patent Application
20200191471
Exemplary embodiments of the present invention relate to a storage shelf base for an item of furniture or household appliance and an item of furniture or household appliance.
Storage shelf bases of this type, in which a support plate and a storage shelf guided on the support plate are arranged so that they can be moved simultaneously in rotation and in translation, allow access to otherwise inaccessible surfaces in the storage space of an item of furniture or household appliance such as a refrigerator or freezer.
For example, DE 42 16 765 A1 discloses storage shelf bases equipped with a turntable where the turntable is installed directly in the base plate of the storage shelf base).
The post-published DE 10 2017 106 170 A1 discloses a storage shelf that is positively guided relative to the support plate and can be moved simultaneously in rotation and translation.
The disadvantage of these prior art storage shelf bases is that the load on the rotating bearing of the shelf is very uneven, especially when the load on the shelf is unevenly distributed. This can result in one of the rolling elements forming a temporary fulcrum due to high frictional forces, which is not congruent with the instantaneous pole of the motion control and can therefore sometimes lead to jamming of the bearing.
Exemplary embodiments of the present invention are directed to a storage shelf base for an item of furniture or household appliance, which enables reliable operation of the storage shelf base even with unequally distributed loads.
The storage shelf base according to the invention has a support plate arranged on the body of the furniture or household appliance and a storage plate, which is positively guided relative to the support plate and can be moved simultaneously in rotation and translation.
The bearing surfaces of the support plate and the storage shelf facing each other have respective closed, circumferential first running grooves in which the rolling elements are guided.
The storage shelf can be moved relative to the support plate in an opening movement from an initial position to an intermediate position, in which the shelf is rotated relative to the support plate in one direction of rotation and displaced in a predetermined direction and can be moved in a closing movement from the intermediate position back to the initial position or further in one direction of rotation to a position rotated through 180° to the initial position.
The storage shelf is rotatable relative to the support plate in a first direction of rotation and in an opposite second direction of rotation, which further simplifies the operability of the device.
A further simplification of the operability of the device is achieved in that the storage shelf can be rotated at any angle relative to the support plate in a first direction of rotation and in an opposite second direction of rotation.
The mutually facing bearing surfaces of the support plate and the storage shelf have respective second running grooves in which rolling elements are guided, wherein the second running grooves of the support plate and the storage shelf at least partially enclose the first running grooves of the support plate and the storage shelf.
By introducing the second running grooves into the bearing surfaces of the support plate and the storage shelf, a more even force distribution is possible even with asymmetrical loading. This significantly reduces frictional forces in the bearing arrangement. In particular, the surface pressure of the rolling elements can be reduced by up to 50%, especially in the static state.
In addition, the danger of undefined movements, especially in the starting phase of the movement of the storage shelf relative to the support plate, is clearly limited by the larger radii of the second running grooves.
In accordance with an advantageous embodiment variant, the second running grooves formed in the bearing surface of the storage shelf are designed as closed, circumferential running grooves, which enables reliable guidance of the rolling elements.
According to another embodiment variant, the outer running groove integrally formed in the bearing surface of the support plate is formed open towards one side, in particular the front side of the support plate, which facilitates the installation of the storage shelf base.
In order to optimize the running-off and running-down of the rolling elements from or onto the support plate, the outer running groove towards the front side of the support plate is designed as a lead-in region, in particular as a lead-in chamfer, wherein a rounded transition can additionally be provided in the transition from the lead-in chamfer to the actual running groove profile, which is designed complementary to the rolling element profile. Instead of the lead-in chamfer, there may also be a lead-in rounding.
The rolling elements are accommodated in at least one rolling element cage according to another preferred embodiment variant.
The rolling elements of the first running grooves and the second running grooves are particularly preferably accommodated in a common rolling element cage, which also facilitates and accelerates the assembly of the storage shelf base.
The rolling element cage has a circular ring and four arms extending radially from the circular ring in a preferred embodiment variant, which enables optimized load distribution to the individual rolling elements with reduced material input.
According to an advantageous embodiment variant, the rolling elements are accommodated in receiving pockets formed in the area of the free ends of the arms and in the circular ring in the area of the connection of the arms to the circular ring.
In order to achieve the largest possible load distribution, the length of the arms is preferably greater than half the radius of the circular ring.
The bearing surfaces of the storage shelf or support plate are designed integrally with the support plate or storage shelf in accordance with an embodiment variant of the invention. In an alternative embodiment variant, at least one of the bearing surfaces is designed as a separate element that can be inserted into an appropriately shaped receptacle in the support plate or storage shelf or which can be attached to the support plate or storage shelf by connecting means.
For improved positioning of the storage shelf in the basic position, the at least predominantly closed circumferential running grooves preferably have several locking points for the rolling elements at least in the initial position and/or in a position rotated by 180° to the initial position.
In accordance with another advantageous embodiment variant of the invention, a tilting protection element is arranged on the support plate that overlaps the upper edge of the storage shelf and serves to prevent a tilting movement of the storage shelf around a tilting axis parallel to the shelf surface. Alternatively, the tilting protection element can be designed in such a way that it engages in a groove in the shelf.
The advantage of such a tilting protection element is the prevention of a tilting movement of the storage shelf, especially when the load on the storage shelf is unevenly distributed with objects placed on the storage shelf.
According to a preferred embodiment variant, a section of the tilting protection element is located in a second recess of the base plate holder, whereby an additional stabilization of the tilting protection element is achieved. The tilting protection element is designed as a catch hook, in particular formed in a C-shaped manner, according to a preferred embodiment variant.
In the following, preferred embodiment examples of the invention are explained in more detail using the enclosed drawings, wherein:
In the following figure description, terms such as top, bottom, left, right, front, back, etc. refer exclusively to the exemplary representation and position of the storage shelf base, base plate, support plate, storage shelf, running grooves, etc. selected in the respective figures. These terms are not to be understood restrictively, i.e. these references can change due to different working positions or the mirror-symmetrical interpretation or the like.
In
In this embodiment variant, storage shelf base 1 has a base plate 2, which can be fixed in a stationary manner to a body 13, 14 of an item of furniture 11 or household appliance 12 (shown in
On this support plate 3 there is a storage shelf 4, which can be moved simultaneously in rotation and in translation. For positively guided simultaneous rotational and translational movement, mutually facing bearing surfaces 31, 42 of support plate 3 and support 4 have respective closed, circumferential first running grooves 33, 43, 44 in which rolling elements 10 are guided. The rolling elements 10 used here are in particular balls.
The support plate 3 is detachably fastened to the base plate 2 or, as shown in
Alternatively, the support plate 3 can be attached directly, preferably detachably, to body 13, 14 of the item of furniture 11 or household appliance 12 via one or more adapters. In this case, no additional base plate 2 is necessary or the support plate 3 with the storage shelf 4 replaces the base plate 2.
As shown in
The inner running groove 33 of support plate 3 is designed as a closed circumferential running groove. The outer running groove 34 is open towards a front side of storage shelf base 1.
The outer running groove 34 is preferably designed as a lead-in chamfer towards the front of the support plate 3 in order to facilitate the lead-in and run-down of the rolling elements 10 from or onto the support plate 3, wherein a rounded transition can additionally be provided in the transition from the lead-in chamfer to the actual running groove profile, which is designed complementary to the rolling element profile.
For positively guided simultaneous rotational and translational movement of storage shelf 4, two partially overlapping inner running grooves 43, 44 and two likewise partially overlapping outer running grooves 45, 46 are each inserted into the underside of storage shelf 4. All running grooves 43, 44, 45, 46 are designed as closed circumferential running grooves.
To prevent the loss of this rolling element 10, the rolling elements 10 are accommodated in a rolling element cage 9. A preferred embodiment variant of such a rolling element cage 9 is shown in
The rolling element cage 9 here is in the form of a circular ring 91 with four arm-shaped extension arms 92 extending radially outwards from the circular ring 91, at each of whose free end a further rolling element 10 is accommodated.
It is also conceivable, for example, to design the rolling element cage 9 with only two extension arms 92 or a different number of extension arms 92.
Other designs of the extension arms are also conceivable, for example in the form of V-shaped extension arms.
Four rolling elements 10 are preferably arranged between the first running grooves 33, 43 and 44. Four rolling elements 10 are also preferably arranged between the second, outer running grooves 34, 45, 46. If the rolling element cage 9 is designed with only two extension arms 92, only two rolling elements 10 can be arranged in each case in the inner and outer running grooves.
The rolling elements 10 of the first running grooves 33, 43, 44 and the second running grooves 34, 45, 46 are preferably accommodated in a common rolling element cage 9, as shown in
It is also conceivable to provide separate rolling element cages for rolling elements 10 of the first inner running grooves 33, 43, 44 and rolling elements 10 of the second outer running grooves 34, 45, 46.
To accommodate the rolling elements 10, receiving pockets 93 are preferably formed in the area of the free ends of the extension arms 92 and in the circular ring 91 in the area of the connection of the extension arms 92 to the circular ring 91. These receiving pockets 93 hold the rolling elements, which are designed here as balls, in a stationary manner in the rolling element cage 9.
A staggered arrangement of the receiving pockets 93 is also conceivable, in which the receiving pockets 93 of the circular ring 91 are not arranged radially to the receiving pockets 93 of the extension arms 92.
The length of the extension arms 92 is preferably greater than half the radius r of the circular ring 91 in order to optimize the load distribution to the individual rolling elements 10.
Both the inner running grooves 33, 43, 44 and the outer running grooves 34, 45, 46 are shaped in such a way that, when force is applied to the storage shelf 4 in the horizontal direction, the storage shelf 4 can be moved from an initial point in accordance with the orientation of the storage shelf 4 shown in
The movement back to the initial position is equally simple by exerting force in the horizontal direction in the closing direction, in which the storage shelf 4 is moved further into the closing position while maintaining the initial direction of rotation, or by reversing the direction of rotation.
As shown in
For this purpose, the base plate holder 5 has two recesses 54, into which a respective connecting element 6 extending from one edge of the support plate 3 can be inserted and which are held in the inserted state in the base plate holder 5 by positive or frictional locking.
As shown in
The base plate holder 5 essentially consists of a strip-shaped base body 51 with a slot 52 extending over the longitudinal extension of the base body 51, which serves to accommodate a rear edge 22 of the base plate 2.
A fastening strip 53 is integrally formed above slot 52, which serves to fasten the base plate holder 5 to the body 13, 14 of the item of furniture 11 or the household appliance 12 and with which the base plate 2 can be fixed to the body 13, 14 of the item of furniture 11 or household appliance 12, here in the form of a refrigerating appliance.
One or more first recesses 54 are introduced into this fastening strip 53, the one or more first recesses 54 are used to accommodate the connecting element 6.
As shown in
Such a tilting protection element 7 is also arranged on the support plate 3 and shaped in such a way that it overlaps an upper edge 48 of the storage shelf 4.
The tilting protection element 7 serves to prevent a tilting movement of the storage shelf 4 around a tilting axis parallel to the shelf surface 41 of the shelf 4. Such a tilting movement can occur, in particular, when loads are distributed unevenly on shelf surface 41 of storage shelf 4.
The tilting protection element 7 is preferably designed as a C-shaped catch hook, wherein a section 73 of the tilting protection element 7 protrudes from the rear edge of the support plate 3 and is bent upwards. A flat central section 72 adjoins this section 73, wherein its height extension is adapted to the vertical height of a wall surrounding the shelf surface 41 of the storage shelf 4, with a bent end 71 of the tilting protection element 7 adjoining the central section 72 projecting beyond its upper edge 48 and, in the event of a tilting movement, prevents the storage shelf 4 from tilting.
It is also conceivable to arrange retaining elements on the support plate 3 itself, in particular to form them integrally, which retaining elements engage around the base plate 2 and thus allow the support plate 3 to be fixed to the base plate 2.
The support plate 3 and the storage shelf 4 are fixed to each other for axial fixing by means of a fixing device 8.
As shown in
In order to enable a low-friction displacement movement, a washer 82 and a sliding ring 83 are placed on screw 81, which is in contact with the underside of the support plate 3 facing the base plate 2 in the area of slot 35.
For axial fixing to the storage shelf 4, a mounting bracket 47 is inserted into the shelf surface 41 of the shelf 4, which is covered by a cap 84.
The underside of this cap 84 facing screw 81 is provided with a screw hole with an internal thread into which screw 81 can be screwed, thus holding the cap 84 axially in its mounting position.
The base plate 2 can be designed as a glass plate. It is also possible to design a base plate 2 as a wooden plate or a plate made of plastic or metal. The support plate 3 and the storage shelf 4 are preferably made of plastic or glass.
It is particularly advantageous that, for example, in the case of a household appliance designed as a refrigerating device, such as in particular a refrigerator or freezer, an already existing base plate 2, for example in the form of a glass plate, can be used to stabilize and retrofit the support plate and the storage shelf to create a storage shelf base 1, which can be moved simultaneously by translation and rotation and is therefore particularly easy to load or unload.
Although the invention has been illustrated and described in detail by way of preferred embodiments, the invention is not limited by the examples disclosed, and other variations can be derived from these by the person skilled in the art without leaving the scope of the invention. It is therefore clear that there is a plurality of possible variations. It is also clear that embodiments stated by way of example are only really examples that are not to be seen as limiting the scope, application possibilities or configuration of the invention in any way. In fact, the preceding description and the description of the figures enable the person skilled in the art to implement the exemplary embodiments in concrete manner, wherein, with the knowledge of the disclosed inventive concept, the person skilled in the art is able to undertake various changes, for example, with regard to the functioning or arrangement of individual elements stated in an exemplary embodiment without leaving the scope of the invention, which is defined by the claims and their legal equivalents, such as further explanations in the description.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2017 120 159.9 | Sep 2017 | DE | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/EP2018/072994 | 8/27/2018 | WO | 00 |
