Electric, gas, combination or similar oven provided with a door, the glass surface of which is kept at low temperature

Abstract: An electric, gas combined or similar oven (1) comprising a door (3) provided with a window (4), said window having an outer (5) and an inner surface (6) and a panel (9) interposed therebetween, said panel (9) comprises at least one mobile portion (25, 26) which when moved within the door (3) allows visual access to the interior of the usual cooking chamber (2) of the oven (1), the movement of said portion (25, 26) being controlled from the outside of said oven (1) by a suitable control member (40).

Description: This invention relates to an electric, gas, combination or similar oven comprising a door provided with a window, having an outer and an inner surface and a panel interposed therebetween, said panel comprising at least one mobile portion which when moved within the door allows visual access to the interior of the usual cooking chamber of the oven, the movement of said portion being controlled from the outside of said oven by a suitable control member via lever means for moving at least one arm having a fork-shaped free end acting on a pin fixed to the mobile portion, said lever means comprising a member subjected to the action of a pushbutton or the like provided on the outside of the door of the oven or on the face of the latter. An oven of the type described herebefore is disclosed in US-A-3500815. In this known oven a movable panel is interposed between the outer and inner surface of the window. Said panel can be moved up and down in order to provide either visual access to the interior of the oven or to separate the outer surface of the window from the heat of the oven. The panel is moved up and down by means of a lever system connected to a member on the outside of the oven which can be acted on in order to move the panel. An oven of similar construction is disclosed in GB-A-1260575. It is an object of the invention to provide an oven of the type as described before provided with an improved system for moving the mobile panel portion. The oven according to the invention is characterized in that said member is pivoted to an element disposed on at least one side portion of the panel, to said element there being provided an arm which acts on the mobile portion of said panel, whereas the member on which the pushbutton acts comprises a cam in which slides a pin fixed to the side portion of the panel, said member carrying a disc element arranged to cooperate with a frusto-conical portion of the pushbutton. With this simple and reliable construction an easy moving of the panel by the user of the oven is achieved. The present invention will be further apparent from the accompanying drawing, which is provided by way of non-limiting example and in which: Figure 1 is a perspective partial front view of an oven with a sideways opening door constructed in accordance with the present utility model; Figure 2 is a section on the line II-II of Figure 1; Figure 3 is a section on the line III-III of Figure 2; Figure 4 is a section analogous to that of Figure 2, but of a different embodiment of the utility model. With reference to Figures 1, 2, 3 the oven (which can be a usual electric resistance element, gas or combination oven) comprises a casing 1 in which there is a cooking compartment or chamber 2 provided with a door 3. The door has a window 4, comprising two transparent surfaces 5 and 6 (external and internal to the oven), advantageously of glass, provided parallel to each other a certain distance apart. The two surfaces are supported by the body 7 of the door 3 in known manner, usual seal means 8 being provided at the opposite ends of each of said surfaces. Between the two surfaces 5 and 6 there is provided a wall 9 of a material not transparent to the heat generated within the cooking chamber 2, and advantageously of zinc or chromium plated sheet iron, aluminium alloy or another similar material. The wall 9 is supported by a frame 11 formed within the door body 7 or associated with said body in any known manner. In particular, in the embodiment of Figure 1, the wall 9 is inserted into a perimetral recess 12 of the frame 11, usual seal elements 13 being advantageously provided between the wall 9 and said frame. However, the wall 9 can be associated with the frame 11 in any other known manner. The wall 9 can be provided at any point between said surfaces 5 and 6; for example, as shown, the wall 9 can be arranged to define two interspaces 14 and 15 between it and said surfaces 5, 6. In the embodiment shown in the figures, these interspaces connect together two cavities 16 and 17 provided above and below the window 4 of the door 3. These cavities open into the front 18 of the door 3, where grilles 19 and 20 are positioned along the opening. The grilles are associated with said door in any known manner, for example by gluing them to the walls of said openings or by elastic snap-fitting. Alternatively, the cavity 17 can open into the underside of the door 3, in which case the grille 20 does not necessarily have to be provided over the opening. The wall 9 comprises at least one mobile portion which when moved within the door 3 provides visual access to the interior of the cooking chamber 2 from the outside of the oven. More specifically, in the described example the wall 9 comprises two mobile portions 25 and 26 which move in guides 27 along fixed portions 28 and 29 of said wall 9, said fixed portions being associated with the aforesaid frame 11. Said guides 27 are disposed along side portions 30 of said wall 9, said side portions being constructed of metal, as are said fixed portions 28 and 29. On at least one of said portions 30 there is provided a lever system 31 for moving the mobile portions 25 and 26 in said guides 27. This lever system comprises an element 32 positioned along said portion 30 and having one end 33 partly inserted into a compression spring 34 (which can be inserted into a suitable seat associated with the door 3) having its free end 35 resting on a fixed part 36 of said door. The element 32 is pivoted at 37 (in any known manner) to a member 38 acting as a lever and supporting a disc element 39 which cooperates with a pushbutton 40 projecting from the face 18 of the door 3 (or from the face of the oven 1 or from the top of the oven 1). The member 38 comprises a cam 41 in which a pin 42 fixed to the portion 30 of the wall 9 slides. The pushbutton 40 comprises a part 40A projecting from an aperture 43 provided in the face 18 of the door 3 and a frusto-conical part 40B which cooperates with the disc element 39. The pushbutton 40 also comprises a cavity 45 containing a spring 46 against which there acts an element 47 slidable in said cavity along a rod-shaped guide 48 secured to a fixed part of the door 3. The pushbutton 40 is guided in its movement by said rod-shaped guide and by said guide 27 (or by another like element positioned to one side of the pushbutton). To the element 32 there is pivoted at 49 one end 50 of an arm 51, the other end 52 of which is of fork shape and is arranged to receive a pin 53 associated with the mobile portion 25 of the wall 9. The arm 51 is also pivoted at 54 to the side portion 30 of said wall 9. Likewise, a further arm 55 is pivoted at 56 and 57 to the element 32 and to the side portion 30 of the wall 9 respectively; this arm also has a fork-shaped end 59 which receives a pin 60 associated with the mobile portion 26 of the wall 9. It will now be assumed that an oven in which the door 3 is constructed in accordance with the present invention is to be used, and that, specifically, the interior of the cooking chamber 2 containing an article for treatment is to be viewed. To do this, the pushbutton 40 is pressed so that the disc element 39 moves along its frusto-conical part 40B. Said element rises along said part to drag with it the member 38, which rotates about the pivot 37 (arrow F, Figure 2). The limits of this rotation are defined by the movement of the pin 42 within the cam 41. As the member 38 rotates, the element 32 moves against the spring 34 (arrow W, Figure 2). The element 32 therefore moves downwards in Figure 2 to rotate the arms 51 and 55 about the respective pivots 54 and 57 (arrow K). Said rotation results in the movement of the pins 53 and 60 within the fork-shaped ends 52 and 59; the lifting action generated by these latter on said pins results in the movement of the mobile portions 25 and 26. These portions therefore move from their rest positions (shown in Figure 2) in the guides 27 to create an opening in the wall 9 to enable the user to view from the outside the article contained in the cooking chamber 2. On releasing the pushbutton 40, the spring 34 urges the element 12 upwards in Figure 2, so that the portions 25 and 26 move together to close the opening which had previously been formed. Figure 4 shows a further embodiment. In this figure, parts corresponding to those of Figures 1, 2 and 3 are indicated by the same reference numerals. In said figure it can be seen that each arm 51 and 55 is pivoted to a fixed disc element 72 at 70 and 71 respectively. This increases the rigidity and mechanical strength of the system comprising the element 32 and said arms. The action of the pushbutton 40 on the disc element 39 results in a lowering (in Figure 4) of the member 38 (arrow X, Figure 4). The element 32 therefore rises (arrow Y) with consequent rotation of the arms 51 and 55 (arrows Z, P) and movement of the portions 25 and 26 along the guide 27. A device constructed in accordance with the present invention enables the temperature at the outer surface 5 of the window 4 of the door 3 of the oven 1 to be considerably reduced. It also allows simple and accurate viewing of the interior of said oven.

Claims: An electric, gas combined or similar oven comprising a door (3) provided with a window (4), said window having an outer and an inner surface (5,6) and a panel (9) interposed therebetween, said panel (9) comprising at least one mobile portion (25,26) which when moved within the door (3) allows visual access to the interior of the usual cooking chamber (2) of the oven (1), the movement of said portion (25,26) being controlled from the outside of said oven (1) by a suitable control member (40), via lever means (32,38) for moving at least one arm (51,55) having a fork-shaped free end (52,59) acting on a pin (53,60) fixed to the mobile portion (25,26), said lever means comprising a member (38) subjected to the action of a pushbutton or the like (40) provided on the outside of the door (3) of the oven (1) or on the face of this latter, characterized in that said member (38) is pivoted (at 37) to an element (32) disposed on at least one side portion (30) of the panel (9), to said element (32) there being provided the arm (51, 55) which acts on the mobile portion (25, 26) of said panel (9), whereas the member (38) on which the pushbutton (40) acts comprises a cam (41) in which there slides a pin (42) fixed to the side portion (30) of the panel (9), said member (38) carrying a disc element (39) arranged to cooperate with a frusto-conical portion (40B) of the pushbutton (40). An oven as claimed in claim 1, characterized in that the pushbutton (40) comprises a portion (40A) projecting from an aperture (43) in the door (3), said pushbutton sliding along a guide rod (48) against a spring (46) disposed in a cavity (45) provided in said pushbutton and along a further external guide (27).

Inventors: DAMSTEEGT JOHANNES ARIE GIJSBE, FIOROLI MARIO, FRANZETTI GIOVANNI, KOKKELER FRANCISCUS, DAMSTEEGT, JOHANNES ARIE GIJSBERT PIETER, FIOROLI, MARIO, FRANZETTI, GIOVANNI, KOKKELER, FRANCISCUS
Applicants: EURODOMESTICI IND RIUNITE, WHIRLPOOL EUROP, IRE INDUSTRIE RIUNITE EURODOMESTICI S.R.L., WHIRLPOOL EUROPE B.V.
Application year: 1991
Main classification: F24C15
IPC codes: F24C15