Door for apparatus to cook and/or heat food and corresponding production method

Abstract

Door for apparatus to cook and/or heat food, that comprises at least a perimeter frame and two panels, located distanced and facing each other and delimited externally by said at least one perimeter frame, so as to form a closed chamber, at least one of the two panels being co-molded with the at least one perimeter frame.

Claims

1. A door for an apparatus to cook and/or heat food, wherein the door comprises a perimeter frame and two panels, said two panels including an internal panel and an external panel, said two panels located distanced and facing each other and delimited externally by said perimeter frame, so as to form a closed chamber, at least said internal panel being co-molded with the perimeter frame to form a hermetic perimeter seal between the internal panel and the perimeter frame configured to prevent penetration of steam between the internal panel and the perimeter frame into the closed chamber, wherein said internal panel is made of a material that is more resistant to heat than a material of the external panel, and wherein the closed chamber is hermetically sealed on both an internal side and an external side.

2. Door as in claim 1, wherein the door comprises two perimeter frames each co-molded separately with one of the two panels.

3. Door as in claim 1, wherein the door comprises a perimeter frame co-molded with both panels.

4. Door as in claim 1, wherein each panel is made of a transparent material chosen from a group comprising glass, plastic material such as polycarbonate, Plexiglas or polymethylmethacrylate or other suitable material.

5. Method to produce a door, wherein the door includes at least a perimeter frame and two panels, said two panels including an internal panel and an external panel, and wherein the method comprises positioning said panels opposite and distanced from each other, delimiting them externally with the at least one perimeter frame, in order to form a closed chamber, at least said internal panel being obtained by co-molding with the at least one perimeter frame to form a hermetic perimeter seal between the internal panel and the perimeter frame configured to prevent penetration of steam between the internal panel and the perimeter frame into the closed chamber, the method further comprising forming the internal panel of a material that is more resistant to heat than a material of the external panel, and wherein the step of forming the closed chamber comprises hermetically sealing the closed chamber on both an internal side and an external side.

6. Method to produce the door as in claim 5, wherein the method co-molds separately at least one panel with the respective perimeter frame.

7. Method to produce the door as in claim 5, wherein the method co-molds both the panels with the perimeter frame.

8. Apparatus to cook and/or heat food comprising a door as in claim 1.

9. Apparatus as in claim 8, said apparatus co-operatively defining an internal cooking zone with the door, the apparatus further comprising one or more heating elements located in the internal cooking zone, where the internal panel is closer to the one or more heating elements than the external panel.

10. Apparatus as in claim 9, wherein a wall of the internal cooking zone extends between the one or more heating elements and part of the internal panel.

11. Door as in claim 1, further comprising a gripping handle extending from the external panel.

12. Door as in claim 1, wherein the perimeter frame is made of metal.

13. Door as in claim 1, wherein the perimeter frame comprises a plastic material selected from the group consisting of polybutylene terephthalate (PBT), polypropylene (PP), polyethylene (PE), polyethylene terephthalate (PET), polymethylmethacrylate (PMMA), polystyrene (PS), or a combination thereof.

14. Door as in claim 3, wherein the perimeter frame is co-moulded with both sides to hermetically seal the closed chamber.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) These and other characteristics of the present invention will become apparent from the following description of some forms of embodiment, given as a non-restrictive example with reference to the attached drawings wherein:

(2) FIG. 1 is a perspective view of an apparatus with a door in accordance with the present invention;

(3) FIG. 2 is a lateral view in section of part of the apparatus in FIG. 1;

(4) FIG. 3 is a lateral view in section of a variant of FIG. 2.

(5) To facilitate comprehension, the same reference numbers have been used, where possible, to identify identical common elements in the drawings. It is understood that elements and characteristics of one form of embodiment can conveniently be incorporated into other forms of embodiment without further clarifications.

DETAILED DESCRIPTION OF SOME FORMS OF EMBODIMENT

(6) We shall now refer in detail to the various forms of embodiment of the present invention, of which one or more examples are shown in the attached drawing. Each example is supplied by way of illustration of the invention and shall not be understood as a limitation thereof. For example, the characteristics shown or described insomuch as they are part of one form of embodiment can be adopted on, or in association with, other forms of embodiment. It is understood that the present invention shall include all such modifications and variants.

(7) In accordance with the present description, the invention concerns a door 10 that can be applied in apparatuses 11 to cook and/or heat food, such as for example, but not only, electric cookers, ovens or other similar apparatuses 11, both for domestic and non-domestic use.

(8) FIG. 1 is used to describe a possible application of the door 10 on the apparatus 11, in this case an electric cooker.

(9) In particular, the door 10 can be assembled advantageously on a front surface of the apparatus 11, to facilitate the introduction and removal of food from inside it.

(10) Moreover, to facilitate opening and/or closing the door 10, the door 10 can comprise a gripping handle 19.

(11) The door 10 can also comprise a plurality of adjustment elements 20 of the known type, in the case of FIG. 1 three adjustment elements 20, configured to selectively adjust some parameters of the apparatus 11 during use, such as for example, but not only, the cooking temperature, the type of cooking, the cooking time or other similar parameters.

(12) The apparatus 11 normally comprises one or more heating elements 17, such as for example electric resistances, selectively activated when the apparatus is switched on and normally disposed inside a cooking zone 18, in a position of proximity to one of the internal faces of walls of the apparatus 11.

(13) In forms of embodiment described here, the door 10 comprises at least one perimeter frame 12 and two panels 14a and 14b, respectively internal and external, located distanced and facing each other, of which at least one of the two panels 14a and 14b is co-molded with the perimeter frame 12.

(14) The panels 14a and 14b are preferably made of a transparent material in order to allow to see inside the apparatus 11 with the door 10 closed.

(15) In forms of embodiment described with reference for example to FIG. 2, the door 10 comprises two perimeter frames 12a and 12b, respectively internal and external, each of which is associated to one of the two panels 14a, and 14b.

(16) In other forms of embodiment of the present invention, described for example with reference to FIG. 3, the door 10 comprises a single perimeter frame 12, to which both the panels 14a and 14b are associated.

(17) The panels 14a and 14b are delimited externally, in this case completely, by the at least one perimeter frame 12, 12a, 12b so as to define therewith a closed chamber 15, of which the panels 14a and 14b form two opposite lateral walls.

(18) In particular, together with a body 16 of the apparatus 11, the chamber 15 defines the internal cooking zone 18, which it is possible to access by means of the door 10.

(19) Each perimeter frame 12, 12a and 12b can advantageously be made of plastic material able to resist the increase in temperature determined during use by the heating elements 17 located in the internal cooking zone 18 of the apparatus 11 and in proximity to at least one of the internal faces of the cooking zone 18.

(20) The plastic material can be, for example but not only, polybutylene terephthalate (PBT), polypropylene (PP), polyethylene (PE), polyethylene terephthalate (PET), polymethylmethacrylate (PMMA), polystyrene (PS) or other resistant plastic material or again, a combination thereof.

(21) In other forms of embodiment described here, each perimeter frame 12, 12a, and 12b can be made of metal material, at least in one portion thereof, so as to advantageously reduce production costs.

(22) The two panels 14a and 14b can be made of glass, such as tempered glass for example, low emissivity glass or other similar types, so as to guarantee sufficient resistance to the heat that develops when the apparatus 11 is in use.

(23) In variant forms of embodiment, the two panels 14a and 14b can also be made of plastic material that, in its transparency, is similar to glass, such as for example polycarbonate (PC), Plexiglas or polymethylmethacrylate (PMMA) or other type of transparent plastic material.

(24) In forms of embodiment described here, the two panels 14a and 14b can be made of the same material or, alternatively, each of a different material, for example when it is necessary to differentiate their resistance to heat.

(25) For example, the internal panel 14a can be made of a more resistant material, since it is located near the heating elements 17 of the apparatus 11, while the external panel 14b can be made of a less resistant material, because it is farther from the heating elements 17.

(26) Depending on the type of materials used, it is therefore possible to contain the costs associated with the production of the door 10.

(27) In forms of embodiment described here, the door 10 is advantageously made by hot co-molding of at least one of the two panels 14a and 14b with the at least one perimeter frame 12, 12a and 12b.

(28) In the case of FIG. 2, the internal panel 14a is co-molded with the internal perimeter frame 12a, so as to define a compact structure and to obtain a perfect cohesion and seal between the two.

(29) Thanks to the perimeter seal obtained between the internal panel 14a and corresponding internal perimeter frame 12a, the penetration of steam from inside the apparatus 11 into the closed chamber 15 is prevented, thus preventing the formation of condensation on the surfaces of the panels 14a and 14b.

(30) In particular, after positioning the internal panel 14a in a mold, the material or mixture of materials that make up the internal perimeter frame 12a are introduced into the mold, for example by injection.

(31) The mold is subsequently hot pressed so as to guarantee adhesion between the internal perimeter frame 12a and the internal panel 14a and, subsequently, to solidify upon it.

(32) Finally, the second panel 14b can be attached, for example by jointing, to the external perimeter frame 12b, in turn attached to the internal perimeter frame 12a, defining the chamber 15 (FIG. 2).

(33) In this way, the chamber 15 is sealed and hermetic in its internal side, thus considerably reducing the possibility of formation of condensation when the apparatus 11 to which the door 10 is associated is in use.

(34) The seal of the chamber 15 on the internal side also allows to reduce the heat dispersion that occurs when the apparatus 11 is in use, thus allowing to obtain energy saving for cooking and/or heating food.

(35) Furthermore, this production mode can easily be performed in series, considerably reducing the costs associated with the production of the door 10.

(36) This production mode is also particularly versatile because, depending on specific requirements, it is possible to make doors 10 in different types of materials.

(37) In particular, it is possible to choose both the composition of the perimeter frames 12, 12a and 12b, and also that of the panels 14a and 14b, without changing or making modifications to the production process described above.

(38) In other forms of embodiment described here, the external perimeter frame 12b and the external panel 14b can also be made by co-molding, as described above.

(39) In still other forms of embodiment described with reference to FIG. 3, the whole door 10 can be made by co-molding both panels 14a and 14b and the perimeter frame 12.

(40) In this case, both the panels 14a and 14b are positioned in the mold as cited above, and subsequently the material that makes up the perimeter frame 12 is injected.

(41) Consequently, during the hot compression operation, the material of the perimeter frame 12 adheres to both the panels 14a and 14b, solidifying on them.

(42) This solution guarantees that the chamber 15 has hermetic characteristics both on the internal side and on the external side, guaranteeing even more that the formation of condensation is prevented on the surfaces of the panels 14a and 14b facing toward the chamber 15.

(43) In this way, moreover, the chamber 15 is obtained directly during the co-molding process, without needing to attach the different components of the door 10 to each other.

(44) Furthermore, in this way it is also possible to reduce the formation of molds, fungi or other parasite organisms, since the chamber 15 has less tendency to get dirty inside, because it is sealed.

(45) It is clear that modifications and/or additions of parts may be made to the door 10 for an apparatus 11 for cooking and/or heating food, and the corresponding production method as described heretofore, without departing from the field and scope of the present invention.

(46) It is also clear that, although the present invention has been described with reference to some specific examples, a person of skill in the art shall certainly be able to achieve many other equivalent forms of door 10 for an apparatus 11 for cooking and/or heating food, and the corresponding production method, having the characteristics as set forth in the claims and hence all coming within the field of protection defined thereby.