The invention relates to a refrigerator and/or freezer with an appliance body and a door for closing an opening of the appliance body, wherein a pivot bearing is provided which pivotably supports the door relative to the appliance body about a pivot axis.
Refrigerators and freezers generally have on their door an elastic gasket with an integrated magnet which has the function of pulling the door-side gasket bead against the sealing contact surface on the appliance body. Due to the geometric properties of such pivot doors, however, the desired optimal sealing interface is often not achieved, especially in the region of the door adjacent the pivot axis, despite obliquely positioned magnets present in the gasket profile. The magnet prematurely attracts the gasket against the appliance body such that the gasket does not seat in optimal fashion and may flex as the door continues to pivot closed. Both problems result in an unsatisfactory seal which may cause increased frost formation in the freezer space, and more generally, premature wear of the gasket.
When door 6 is pivoted in the closing direction around the essentially vertical pivot axis 5 from the pivoted-open position, the magnet 4 first contacts sealing contact surface 2 of appliance body 1, as shown in
The object of the invention is therefore to create an improved refrigerator or freezer of the type mentioned in the introduction in which the disadvantages of prior-art technology may be avoided and in which this technology may be further modified in an advantageous manner. Specifically, the goal is to achieve an improved opening and closing of the door with the most optimum seal possible.
This object is achieved according to the invention by a refrigerator and/or freezer described herein. Advantageous embodiments of the invention are also described herein.
According to the invention, an additional axis of motion perpendicular to the pivot axis is thus provided for the door. The door may be movably mounted relative to the pivot axis, and/or the pivot axis may be movably mounted relative to the appliance body, in the direction perpendicular to the pivot axis. The pivot bearing is thus designed such that in addition to the rotational pivot motion of the door about the pivot axis, in the region of the pivot axis the door may be moved roughly perpendicular to the sealing interface of the appliance body away from or onto said body. This capability of translational motion transverse to the pivot axis prevents flexure of the gasket. This gasket may essentially be mounted vertically onto the opposite sealing contact surface such that it is always seated in the intended position and provides the optimum seal. Similarly, flexure is prevented when the door is opened since the additional pivot axis of the door perpendicular to the sealing contact surface allows the gasket to be pulled vertically away from the opposite sealing interface.
In a further modification of the invention, the motion of the door is controlled perpendicular to the pivot axis as a function of the pivot position of the door. A corresponding motion-control device may specifically be designed such that at the beginning of a pivot-opening process the door is initially moved essentially perpendicular to the pivot axis and thus vertically away from the appliance body; while conversely, toward the end of each pivot-closing process, the door is moved essentially perpendicular to the pivot axis, and thus perpendicular to the appliance body or its sealing contact surface and onto the latter. The translational motion superimposed on the pivot motion is thus provided in the pivot region adjoining the completely closed position of the door such that in this region the door is moved translationally essentially perpendicular to the appliance body. The conventional pure pivot motion may then be again provided in the subsequent open pivot region of the door.
Preferably, a cam device is provided perpendicular to the pivot axis, specifically in the region of the pivot axis between the appliance body and the door, to control the door motion, said cam device determining the door's distance from the appliance body as a function of the pivot position of the door. A cam may be provided with a first curve section which allows for a door position close to the appliance body, and with a second curve section adjoining the first curve section which results in a distant door position removed from the appliance body. When the door is opened, the cam presses the door in the region of the pivot axis away from the sealing interface of the appliance body. When closed, the door snaps in or falls vertically onto the sealing interface at the end of the pivot-closing process. In principle, the cam may be provided on the door or on the appliance body and rest against the opposite sliding surface. In a preferred embodiment of the invention, the cam is rigidly connected to the door so that it slides or rolls off, along with its curve control surface, on a support surface fixedly attached on the appliance body side when the door is pivoted open or closed.
Preferably, a pretensioning device, specifically a spring device, is provided to pretension the door relative to the pivot axis, or the pivot axis relative to the appliance body, in the direction of the additional axis of motion. The spring device presses the pivot axis relative to the door or relative to the appliance body into its initial position from which it is pressed out by the above-mentioned cam against the spring tension given the appropriate pivot position of the door. The pretensioning device is oriented such that when the door is closed the door is under tension toward the appliance body. The pretensioning device is appropriately dimensioned such that its pretensioning force is greater than the sealing forces in effect between door and appliance body, i.e., such that sealing forces already in effect between door and appliance body do not cause any displacement of the pivot axis, or the door to be pressed open.
The cam device and pretensioning device advantageously act together so as to effect an automatic closing of the door in the final section of the door's pivot motion. Cam device and pretensioning device together form a kind of automatic closing device. The last segment automatically swings the door shut in response to the pretensioning force and its translation by the cam device.
The additional axis of motion of the door perpendicular to the sealing contact surface of the appliance body is preferably achieved by movably mounting the door relative to the pivot axis fixed to the appliance body, and specifically in the direction transverse to the longitudinal direction of the pivot axis. In principle, is also possible, based on an approach employing a kinematic reversal, to mount the door in the conventional fashion as nondisplaceable and only rotationally movable on the pivot axis and then to arrange the latter movably relative to the appliance body in the direction perpendicular to the sealing interface of the appliance body. The preferred approach is the previously mentioned design with the pivot axis rigidly fixed on appliance body. Specifically in this regard, elongated holes may be provided on the door side in the form of bearing slots for the pivot axis, in which holes the pivot axis runs or by which the door sits on the pivot axis. The elongated-hole-shaped bearing slots extend perpendicular to the front and rear sides of the door, thereby achieving the desired motion perpendicular to the sealing interface of the appliance body.
Preferably, door arresters may be provided which sit essentially free of play and rotationally on the pivot axis, and which are pretensioned by a spring relative to the door in the direction of the door side facing away from the appliance body. The above-mentioned door arresters cause the pivot axis to be pressed preferably toward one end of the elongated-hole-shaped bearing slots of the door such that a defined position of the door relative to the pivot axis is provided whenever the cam device does not press the axis in another direction.
Door arrester and cam device preferably form one assembly unit. In one advantageous embodiment of the invention, provision may be made that one cam each is rigidly fixed to the door along with a control curve surface facing the appliance body and has a guide for one door arrester each in which the respective door arrester located on the pivot axis is displaceably routed perpendicular to the front and rear sides of the door. The pretensioning device, preferably in the form of a spring, may also be integrated into the cam. The cam may have a spring slot to accommodate the pretensioning spring.
In an alternative preferred embodiment of the invention, the cam may be rigidly fixed on the door along with a control curve surface facing the appliance body and be of an integrated one-piece design with the door arrester sitting on the pivot axis, wherein a spring section is provided between the curve control surface and the door arrester—this being achieved, for example, by having the curve control surface section and the door arrester section together define an approximately U-shaped contour. The one leg defining the door arrester may be deflected by spring action relative to the other leg of the U-shaped body which forms the rigid cam or the rigid curve control surface.
In a further modification of the invention, the pivot axis or the hinge pins are rigidly fixed to hinge plates projecting from the appliance body. The hinge plates may be attached in the conventional fashion to the appliance body or housing. Supports, specifically support pins parallel to the hinge pins, may be provided on the hinge plates on which the door-side-attached cam rests. The cam is preferably of plastic. It is useful to employ a slidable lubricating material such as polyamide. The support pins interacting with the cams at the hinge plates may be steel pins.
The following discussion explains the invention based on preferred embodiments and associated drawings. The drawings are as follows:
Both doors 6 and 7 and are pivotable about a vertical pivot axis which is located on the right side of the refrigerator and freezer as shown in
Both doors here have a top bearing and a bottom bearing which together define the pivot axis 5. The top and bottom bearing of each door 6 and 7 may be designed analogously, and consequently the following discussion describes only the top bearing of refrigerator door 6.
An essentially plate-type door arrester 11 with an essentially U-shaped contour is fastened to the top side of door 6. Specifically, door arrester 11 along with its one leg is rigidly connected to the top side of door 6, specifically screwed to it, while the other leg of door arrester 11 does not have a fixed connection to the surface of the door. Door arrester 11 is composed of an elastic material, specifically a flexible plastic, so that the free door arrester leg 12 may move flexibly relative to the door. Door arrester 11 is arranged such that the recess between legs 12 and 13 runs parallel to the front and rear sides of the door. As a result, free door arrester 12 is able to move or function elastically essentially perpendicular to the front and rear side of door 6.
As
In an alternative inventive design, not shown separately, it would also be possible to dispense with the elongated-hole design 15 and to guide hinge pin 10 exclusively with door arrester leg 12. In this case, hinge pin slot 14 in door arrester 11 would sit essentially free of play and concentrically on hinge pin 10. Mobility would then not be provided by elongated hole 15 but by the elastic motion of door arrester leg 12. Stops may be used to limit the maximum deflection of door arrester leg 12 in the direction of arrow 16.
As
Interacting with cam 17 is a support pin 21 which is rigidly fixed and projects parallel to hinge pin 10 on bearing bracket 8 (see
Curve control surface 18 of cam 17, and support pin 21 are arranged and dimensioned relative to one another such that with the door completely closed, support pin 21 contacts sink 19 of cam 17 with a snug fit. This configuration is shown in
When door 6 is pivoted open from the closed position, curve control surface 18 of cam 17 with its camber 20 projecting toward sealing contact surface 2 must move over support pin 21.
As the door is opened further, curve control surface 18 moves further along support pin 21. Camber 20 retracts so that the spring pretensioning device of elastic door arrester 11 is able to press door 6 back into its initial position relative to hinge pin 14. This is shown in
The spring pretensioning device attempts to press support pin 21 into sink 19 in order to obtain a lower energy level for the system.
Other embodiments are also possible in place of the integrated one-piece and elastic spring-action design of door arrester 11.
A circular hinge pin slot 14 is provided in second door arrester section 24, with which slot second door arrester section 24 sits on hinge pin 10 (
In order to move the door perpendicular to pivot axis 5, spring 25 is deformed accordingly, specifically compressed as in
Another embodiment of the door arrester is shown in
The additional axis of motion of the door perpendicular to pivot axis 5 and, with the door closed, perpendicular to sealing interface 2 in connection with the cam device prevents any flexure of gasket 3. Gasket 3 always meets, and is lifted from, sealing contact surface 2 of body 1 essentially vertically. Defective sealing is prevented and the life considerably lengthened due to the flexure-free closing and opening processes.
Number | Date | Country | Kind |
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201 14 654 U | Sep 2001 | DE | national |
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Number | Date | Country | |
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20030071549 A1 | Apr 2003 | US |