SAFETY DEVICE

Abstract

 Improved heating apparatus comprising a frame (11) defining a combustion chamber, a door (12) associated with the frame (11), and a safety device (13) comprising a first closing element (18) associated with the door (12), and a second closing element (19) associated the said frame (11), at least one of either the first closing element (18) or the second closing element (19) is mobile to determine a normal closed condition and a normal open condition of the door (12),

Description

FIELD OF THE INVENTION

[0001] The present invention concerns an improved heating apparatus for buildings, comprising a closing device for closing the combustion chamber.

[0002] In particular, embodiments described here concern a heating apparatus, with a safety device, fed mainly by a solid biomass, although other types of fuel are not excluded.

[0003] The present invention also concerns a method to make the heating apparatus safe.

BACKGROUND OF THE INVENTION

[0004] Heating apparatuses are known, in particular heating apparatuses using solid biomasses such as wood, pellet or chip, used to heat buildings supplying heat energy by combustion.

[0005] It is also known that, for example in pellet heating apparatuses, the pellets are ignited by a spark plug, or an electric resistance, and thanks to the heat emitted, the pellet begins to lose its residual water and subsequently to pyro-gasify, that is, to produce a mixture of gases that includes carbon monoxide, hydrogen and methane, which starts and maintains combustion.

[0006] If combustion is delayed, for example due to poor quality solid biomass, or to an incorrect setting of the quantity of oxygen entering into the combustion chamber of the heating apparatus, or for other reasons, this can cause a serious imbalance between the fuel and the comburent, in favor of the first of these two elements.

[0007] One disadvantage of current heating apparatuses is that poor maintenance, incorrect functioning or irregular use can lead to an accumulation of solid biomass in the combustion chamber, with consequent difficulties in combustion.

[0008] Another disadvantage, in the event of poor combustion or the flame being suffocated, is that a high quantity of flammable and toxic gases is generated, in particular carbon monoxide.

[0009] Another disadvantage, due precisely to the increase in flammable and toxic gases, is that this leads to an increase in the pressure inside the combustion chamber, with the possible consequence of an explosion being triggered.

[0010] If an explosion occurs, there may be a permanent deformation of the apparatus, the fragments of which can injure the users stationed near the heating apparatus or can in any case create inconvenience for all.

[0011] Furthermore, the environment can be invaded by toxic gases.

[0012] Document WO-A-99/05456 describes a device for closing a furnace in a heating installation, especially for a door for loading a heating fireplace or other type of furnace, comprising an anchoring frame, a door that can be pivoted by a pivoting device and a clamping device. An adjustment device, which allows the relative movement of the door and the anchoring frame, is disposed between the door and the anchoring frame, especially between the pivoting device and the anchoring frame.

[0013] Document EP-A-2,515,043 describes a fireplace with a fixed part associated with an opening toward a combustion chamber, a mobile part opposite the opening and a sealing device. The mobile part provides a wall and slide means that translate the wall, allowing access to the opening.

[0014] Document EP-A-2.309.190 describes a door for a combustion chamber of a furnace, in particular a heater, comprising: a handle of the door, to open and close it, mobile to a release position, a lateral safety closing to laterally close the handle of the door in the release position, and a pre-compression device to put the handle of the door in pre-compression in the release position.

[0015] There is therefore a need to perfect the heating apparatus, providing a safety device that can overcome at least one of the disadvantages of the state of the art.

[0016] In particular, one purpose of the present invention is to obtain a heating apparatus that is practical, efficient and safe.

[0017] More particularly, one purpose of the present invention is to obtain a heating apparatus that, in the event of excessive overpressure in the combustion chamber, allows a controlled release of the excess gas, either through the door or through a suitable safety closure which, in the present description, is included in the term "door".

[0018] Another purpose of the present invention is to provide that when there is overpressure, alarm means can be provided, both visual and possibly acoustic.

[0019] Another purpose of the present invention is to obtain a safety device that is reliable and long-lasting.

[0020] Another purpose of the present invention is to obtain a safety device that is simple and economical.

[0021] The Applicant has devised, tested and embodied the present invention to overcome the shortcomings of the state of the art and to obtain these and other purposes and advantages.

SUMMARY OF THE INVENTION

[0022] The present invention is set forth and characterized in the independent claims, while the dependent claims describe other characteristics of the invention or variants to the main inventive idea.

[0023] In accordance with the above purposes, embodiments described here concern a safety device installed in a heating apparatus to selectively determine a normal closed condition and a normal open condition of a door, the safety device comprising a first closing element associated with the door, and a second closing element associated with a frame of the heating apparatus, at least one of either the first closing element or the second closing element being configured mobile to determine the normal closed condition and the normal open condition.

[0024] According to one aspect of the present invention, at least one of either the first closing element and/or the second closing element is installed translatable with respect to the door, or respectively with respect to the frame, in a controlled and desired manner, on at least a translation device configured to determine a translation of the first closing element and/or the second closing element and to determine a partly open condition of the door, in the event of overpressure in the combustion chamber.

[0025] In possible embodiments, the safety device comprises the first closing element associated with the door, and the second closing element, associated with the frame, can be defined for example by the interaction between a hook associated with a handle and a pin to which the hook can be attached.

[0026] In possible embodiments, the at least one of either the first closing element or the second closing element configured mobile, is movable for example by driving a handle, in order to determine the normal closed condition and the normal open condition of the door.

[0027] Moreover, in possible embodiments, the safety device can be configured to allow to generate an alarm signal to alert the presence of overpressure inside the combustion chamber.

[0028] Other embodiments described here also concern an improved heating apparatus comprising a frame defining a combustion chamber, a door, associated with the frame, and a safety device in accordance with the present description.

[0029] Moreover, in other forms of embodiment, the present invention proposes to perfect a method to determine the open condition of the door, that is, of the safety device. In one embodiment, in particular, a method is provided for opening the door of a heating apparatus comprising a frame defining a combustion chamber, the door being associated with the frame, and a safety device. The method provides that, in the event of overpressure in the combustion chamber, the safety device causes a partial opening of the door.

[0030] In a possible embodiment, the partial opening of the door in the event of overpressure in the combustion chamber is obtained by means of a translation device.

[0031] In another possible embodiment, the method provides to use the safety device, which comprises a first closing element associated with the door, and a second closing element associated with the frame of the heating apparatus, at least one of either the first closing element or the second closing element being mobile to determine a normal closed condition and a normal open condition. Moreover, at least one of either the first closing element and/or the second closing element is installed translatable with respect to the door, or respectively with respect to the frame, in a controlled and desired manner, on at least a translation device configured to determine a translation of the first closing element and/or the second closing element and to determine a partly open condition of the door, in the event of overpressure in the combustion chamber.

[0032] These and other aspects, characteristics and advantages of the present disclosure will be better understood with reference to the following description, drawings and attached claims. The drawings, which are integrated and form part of the present description, show some forms of embodiment of the present invention, and together with the description, are intended to describe the principles of the disclosure.

[0033] The various aspects and characteristics described in the present description can be applied individually where possible. These individual aspects, for example aspects and characteristics described in the description or in the attached dependent claims, can be the object of divisional applications.

[0034] It is understood that any aspect or characteristic that is discovered, during the patenting process, to be already known, shall not be claimed and shall be the object of a disclaimer.

BRIEF DESCRIPTION OF THE DRAWINGS

[0035] These and other characteristics of the present invention will become apparent from the following description of some embodiments, given as a non-restrictive example with reference to the attached drawings wherein:

• fig. 1 is a perspective view of a part of a heating apparatus on which are installed safety devices in accordance with embodiments described here;
• fig. 2a is a cross section view of the safety device in a normal closed condition;
• fig. 2b is a cross section view of the safety device in an open condition of the safety device;
• fig. 3 is a possible variant of fig. 1;
• fig. 4 is an enlarged perspective view of a detail of fig. 3;
• fig. 5a is a cross section view of the safety device of fig. 3 in a normal closed condition;
• fig. 5b is a cross section view of the safety device of fig. 3 in an open condition of the safety device;
• fig. 6 is a possible variant of fig. 1;
• fig. 7 is an enlarged perspective view of a detail of fig. 6;
• fig. 8a is a cross section view of the safety device of fig. 6 in a normal closed condition;
• fig. 8b is a cross section view of the safety device of fig. 6 in an open condition of the safety device.

[0036] 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 embodiment can conveniently be incorporated into other embodiments without further clarifications.

DETAILED DESCRIPTION OF SOME EMBODIMENTS

[0037] We shall now refer in detail to the various embodiments of the present invention, of which one or more examples are shown in the attached drawings. 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 embodiment can be adopted on, or in association with, other embodiments to produce another embodiment. It is understood that the present invention shall include all such modifications and variants.

[0038] Before describing these embodiments, we must also clarify that the present description is not limited in its application to details of the construction and disposition of the components as described in the following description using the attached drawings. The present description can provide other embodiments and can be obtained or executed in various other ways. We must also clarify that the phraseology and terminology used here is for the purposes of description only, and cannot be considered as limitative.

[0039] With reference by way of example to figs. 1, 3 and 6, the present invention concerns an improved heating apparatus 10 that comprises a frame 11, a door 12 associated with the frame 11 and a safety device 13 associated with the door 12 and the frame 11 and provided to determine the selective opening/closing of the door 12.

[0040] The frame 11 defines internally a combustion chamber in which the combustion process is performed. The wall on which the door 12 is installed could be a front wall 14 of the heating apparatus 10.

[0041] According to a possible solution, the door 12 is hinged to the frame 11 in correspondence with a first lateral edge by means of one or more hinging elements.

[0042] The safety device 13 is associated with the door 12 in correspondence with a second lateral edge of the latter, opposite the first lateral edge. The safety device 13 is also provided at least to define a selective opened/closed condition of an aperture for accessing the combustion chamber.

[0043] According to a variant embodiment, the door 12 can include a plate 21, made of transparent or semi-transparent material, for example glass resistant to high temperatures and coplanar with the plane of the door 12.

[0044] Advantageously, between the door 12 and the front wall 14 on which the door is closed, a perimeter washer 15 is interposed.

[0045] The safety device 13 selectively determines a normal open condition and a normal closed condition of the door 12, to allow access to the combustion chamber.

[0046] The safety device 13 comprises a first closing element 18, associated with the door 12, and a second closing element 19, associated with the frame 11.

[0047] At least one of either the first closing element 18 or the second closing element 19 is mobile to selectively couple with/uncouple from the other, and determine the normal open condition and the normal closed condition of the door 12.

[0048] The safety device 13 comprises a translation device 22 installed on the door 12 or on the frame 11, and with which at least one of either the first closing element 18 or the second closing element 19 is associated. The translation device 22 is configured to allow a translation of the first closing element 18 and/or the second closing element 19 with respect to the door 12 or respectively with respect to the frame 11, so as to define a partial opening of the door 12.

[0049] In this way, in the normal functioning of the heating apparatus 10, the door 12 can be selectively opened and closed in the traditional way by reciprocal coupling/uncoupling of the first closing element 18 and the second closing element 19.

[0050] On the contrary, if an internal overpressure is generated inside the combustion chamber, the translation device 22 allows a partial opening of the door 12. The partial opening of the door allows to discharge the overpressure from inside the combustion chamber into the space where the heating apparatus is installed, thus preventing the problem of a permanent deformation of the structure.

[0051] According to some solutions of the present invention, the first closing element 18 and the second closing element 19, during the translation of one and/or the other with respect to the door 12 or the frame 11, remain reciprocally coupled with each other.

[0052] According to variant embodiments, the door 12 can translate both on planes parallel to its lying plane, and also angled.

[0053] In variant embodiments, the translation device 22 can comprise guide devices, for example guide rods 33 attached solid with the door 12 or the frame 11 and on which the first closing element 18 and/or the second closing element 19 are installed, translatable linearly.

[0054] According to a possible solution, the rods 33 are disposed transverse to the plane development of the door 12, to allow to translate the first closing element 18 and/or the second closing element 19 in a direction incident to the plane of the door 12.

[0055] According to one embodiment of the present invention, the safety device 13 comprises at least an elastic element 23 associated between the translation device 22 and the door 12, or between the translation device 22 and the frame 11, and configured to elastically oppose the partial opening of the door 12 in the normal closed condition of the latter.

[0056] For example, by elastic element 23 we mean a compression spring and by way of example associated with the rods 33.

[0057] According to a variant embodiment, the elastic elements 23 can be configured to have a desired and predefined value of elastic constant, which are located with a desired and predefined preload when installed.

[0058] According to other variant embodiments, the value of elastic constant of the elastic elements 23 is such as to allow the assisted translation of the translation device 22, following an explosion, to prevent for example the plate of the door 12 from breaking, and then to return the door 12 to the normal closed condition.

[0059] According to possible solutions of the present invention, shown in figs. 1, 2a, 2b, 3, 4, 5a and 5b, the second closing element 19 is associated with the translation device 22 which allows the second closing element 19 to translate with respect to the frame 11.

[0060] According to figs. 1, 2a, 2b, 3, 4, 5a and 5b, the second closing element 19 comprises a pin 26 suitable to cooperate with the first closing element 18.

[0061] The first closing element 18 can comprise a hook 25 associated with a handle 20 to determine the normal open condition and normal closed condition of the door 12, and to allow the hook 25 to couple with/uncouple from the second closing element 19, in this case the hook 25, to determine the normal open condition and normal closed condition of the door 12.

[0062] According to the solution shown in figs. 1, 2a and 2b, the handle 20 is pivoted on a lateral edge of the door 12 and is provided with the hook 25 on one pivoting side, and with a gripping portion for the user on the other pivoting side.

[0063] According to the solution shown in figs. 3, 4, 5a and 5b, the hook 25 is made on an oblong element 37 kinematically connected to the handle 20.

[0064] The oblong element 37 is associated with the door 12 in correspondence with a perimeter edge thereof.

[0065] The oblong element 37 is connected in translatable mode, with connection and guide elements, to the door 12. By actuating the handle 20, the oblong element 37 is translatable in a direction parallel to the perimeter edge of the door 12.

[0066] In this way, by activating the handle 20 it is possible to define the reciprocal coupling/uncoupling of the first closing element 18 and the second closing element 19, thus defining the normal opening/closing of the door 12.

[0067] According to the solution shown in figs. 3, 4, 5a and 5b, two safety devices 13 according to the present invention are associated with the door 12 in two opposite positions along the perimeter edge of the door 12, thus guaranteeing a safe closure of the door 12 with respect to the frame 11.

[0068] According to the solution shown in figs. 1, 2a and 2b, the translation device 22 is provided with a containing structure 24 in which the pin 26 is solidly installed, and in which the hook 25 is selectively inserted when it is in cooperation with the pin 26.

[0069] The frame 11, in this case an abutment plate 29 thereof, is provided with an aperture 31 in which the containing structure 24 is partly inserted.

[0070] In the case shown by way of example here, the containing structure 24 is provided with an abutment wall 27 which, in normal use, is positioned in abutment against the external surface of the frame 11, in this case against the abutment plate 29, stably associated with the frame 11.

[0071] The rods 33 are solidly associated with the containing structure 24, in this case the abutment wall 27.

[0072] The rods 33 are installed cantilevered with respect to the abutment wall 27.

[0073] The rods 33 are inserted in through holes 30 made in the frame 11, in the case shown here, in the abutment plate 29.

[0074] A counter-plate 35 is associated with the free end of the rods 33, and is disposed during use on the internal side of the frame 11.

[0075] The elastic elements 23 are installed between the frame 11 and the counter-plate 35, in the case shown here on the rods 33, and provide to keep the abutment wall 27 normally in contact with the frame 11.

[0076] Bushings 32 can be installed on the rods 33, and limit the maximum travel of the containing structure 24 with respect to the frame 11.

[0077] According to the solution shown in figs. 3, 4, 5a and 5b, the second closing element 19 is equipped with the pin 26 which is intercepted and couples with the hook 25.

[0078] According to the solution shown in figs. 3, 4, 5a and 5b, the translation device 22 comprises a support structure 48, for example a block, connected protruding cantilevered to the frame 11 and translatable, as described hereafter.

[0079] The second closing element 19, in this case the pin 26, is attached on the support structure 48.

[0080] The support structure 48 is installed sliding along the guide rods 33, which in turn are solidly attached on the frame 11.

[0081] In particular, it can be provided that the support structure 48 is provided with guide holes 49 made through in the support structure 48 and in which the rods 33 are inserted.

[0082] The rods 33, in the case shown here, screws, can be provided with an abutment portion 50, for example the head of the screw. The elastic elements 23 are installed between the abutment portion 50 of the rods 33 and the support structure 48, and are configured to elastically oppose the translation of the support structure 48 with respect to the frame 11. In particular, in the case shown in figs. 3, 4, 5a and 5b, the elastic elements 23 keep the support structure 48 resting against the frame 11 of the heating apparatus 10.

[0083] In the functioning conditions shown in figs. 2a and 5a, the door 12 is closed by the cooperation between the first closing element 18 and the second closing element 19. The pressure inside the combustion chamber is not such as to generate a movement of the second closing element 19, and the elastic elements 23 oppose a partial opening of the door 12.

[0084] In the functioning conditions shown in figs. 2b and 5b, there is a potentially harmful overpressure inside the combustion chamber. The overpressure acts on the internal surface of the door 12 and produces a force that tends to open it.

[0085] When the force is greater than the elastic force exerted by the elastic elements 23, a translation takes place of the second closing element 19 by means of the translation device 22. This causes a partial opening of the door 12 with a consequent discharge into the atmosphere of the overpressure.

[0086] With reference to figs. 6, 7, 8a and 8b, another variant embodiment is shown in which the second closing element 19 is installed on the translation device 22, which allows the second closing element 19 to translate with respect to the door 12.

[0087] The translation device 22 comprises a slider 41 attached to a longitudinal edge of the door 12 and selectively translatable in a direction incident to the plane development of the door 12.

[0088] The second closing element 19 is solidly installed on the slider 41.

[0089] According to the embodiment shown in figs. 6, 7, 8a and 8b, the second closing element 19 comprises a hook 25 in substantially the same way as described above.

[0090] According to a possible solution, the slider 41 is selectively translatable along the rods 33, which according to the embodiment shown in figs. 6, 7, 8a and 8b are associated with the door 12.

[0091] According to the embodiment shown in figs. 6, 7, 8a and 8b, the door 12 comprises a bracket 40 with which the rods 33 are associated, for example in correspondence with support fins 34.

[0092] According to the solution shown in figs. 6, 7, 8a and 8b, the bracket 40 has an oblong development, and is selectively translatable in a direction parallel to the longitudinal edge of the door 12.

[0093] The bracket 40 is connected in turn to a handle 20, able to be selectively actuated by a user, to define the translation of the bracket 40 parallel to the longitudinal edge of the door 12.

[0094] Guide elements can be present between the bracket 40 and the door 12, such as eyelets, pins, screws, to guide the movement of the bracket 40.

[0095] By actuating the handle 20, it is possible to determine a simultaneous translation of the first closing element 18 too, in this case of the hook 25, so as to define said normal closed or normal open conditions of the door 12.

[0096] In fact, during the translation of the bracket 40, the slider 41 also translates together with it.

[0097] The slider 41 is connected to the bracket 40 by connection and guide elements 39, which are configured both to connect the slider 41 to the bracket 40, and also to allow a translation of the slider 41 with respect to the bracket 40, in a direction incident to the development plane of the door 12.

[0098] According to the embodiment in figs. 6, 7, 8a and 8b, the connection and guide elements 39 comprise a pin 45 sliding in an eyelet 46, associated in this case respectively with the bracket 40 and the slider 41. In the case shown here, the pin 45 is threaded and a nut is screwed onto it, with the function of holding the slider 41 against the bracket 40.

[0099] According to a possible embodiment of the present invention, an end-of-travel element 43 is associated with the slider 41, in this case a bent edge, with an end-of travel function of the sliding of the slider 41.

[0100] In particular, according to the embodiment in figs. 6, 7, 8a and 8b, during the sliding of the slider 41, the end-of-travel element 43 contacts a fixed element of the door 12, or the bracket 40, in this case the rods 33, to define the maximum travel of the slider 41.

[0101] According to the solution shown in figs. 6, 7, 8a and 8b, the second closing element 19 comprises a pin 26 installed in a fixed position on the frame 11.

[0102] When the door 12 is in the normal closed condition, the pin 26 has its axis of development substantially parallel to the lying plane of the door 12.

[0103] According to the solution shown in figs. 6, 7, 8a and 8b, the pin 26 is installed on a support body 38 attached protruding cantilevered with respect to the frame 11.

[0104] According to the solution shown in figs. 6, 7, 8a and 8b, the combustion apparatus 10 is provided with more than one safety device 13, in the case shown here two safety devices 13, installed in opposite positions along a perimeter edge of the door 12.

[0105] According to this solution, the handle 20 is kinematically connected both to the bracket 40 that actuates the upper first closing element 18, and also to the bracket 40 that actuates the lower first closing element 18. In this way, with a single action of the handle 20, it is possible to command the closing/opening of both first closing elements 18 on the respective second closing elements 19.

[0106] In the normal closed condition of the door 12, shown in fig. 8a, the handle 20 has been driven to determine a translation of the first closing element 18 and a consequent coupling thereof with the second closing element 19.

[0107] The action of the elastic elements 23 on the slider 41 prevents an uncontrolled opening of the combustion chamber.

[0108] If an overpressure (fig. 8b) is generated inside the combustion chamber, due to the anomalous functioning of the heating apparatus 10, the pressure generated is distributed over the whole surface of the door 12, and tries to open it. When this pressure is enough to contrast the action of the elastic elements 23, the translation device 22 allows the first closing element 18 to translate with respect to the door 12 which therefore is able to partly open, allowing to de-pressurize the combustion chamber. During this translation with respect to the door 12, the first closing element 18 remains coupled with the second closing element 19, and therefore does not allow a complete opening of the door 12.

[0109] According to the invention, in association with the devices shown above by way of example, it is possible to provide means to indicate a dangerous situation in the combustion chamber, which can be mechanical or associated with an electric device or suchlike, which provide an optical or acoustic warning signal of imminent overpressure, and possibly also a second danger signal.

[0110] It is clear that modifications and/or additions of parts may be made to the improved heating apparatus 10 as described heretofore, without departing from the field and scope of the present invention.

[0111] 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 improved heating apparatus 10, having the characteristics as set forth in the claims and hence all coming within the field of protection defined thereby.

[0112] In the following claims, the sole purpose of the references in brackets is to facilitate reading: they must not be considered as restrictive factors with regard to the field of protection claimed in the specific claims.

Claims

1. Safety device installed in a heating apparatus to selectively determine a normal closed condition and a normal open condition of a door (12), said safety device (13) comprising a first closing element (18) associated with said door (12), and a second closing element (19) associated with a frame (11) of the heating apparatus, at least one of either said first closing element (18) or said second closing element (19) being configured mobile to determine said normal closed condition and said normal open condition, characterized in that at least one of either said first closing element (18) or said second closing element (19) is installed translatable with respect to said door (12), or respectively with respect to said frame (11), in a controlled and desired manner, on at least a translation device (22) configured to determine a translation of said first closing element (18) and/or said second closing element (19) and to determine a partly open condition of said door (12), in the event of overpressure in the combustion chamber.

2. Device as in claim 1, characterized in that said device comprises at least an elastic element (23) associated with said translation device (22) and with said door (12), or with said frame (11), and configured to elastically oppose said partial opening of said door (12) in the normal closed condition.

3. Device as in claim 1 or 2, characterized in that said translation device (22) comprises guide elements (33) to guide the translation of said first closing element (18) and/or said second closing element (19).

4. Device as in any claim from 1 to 3, characterized in that said first closing element (18) is installed on said translation device (22).

5. Device as in claim 4, characterized in that said first closing element (18) comprises a hook (25), selectively movable by a handle (20) to define said normal closed condition and said normal open condition of said door (12), said hook (25) being installed on said translation device (22), and in that said second closing element (19) comprises a pin (26) able to be coupled/uncoupled with/from said hook (25).

6. Device as in any claim from 1 to 3, characterized in that said second closing element (19) is installed on said translation device (22).

7. Device as in claim 6, characterized in that said first closing element (18) comprises a hook (25) selectively movable by a handle (20) to define said normal closed condition and said normal open condition of said door (12), and in that said second closing element (19) comprises a pin (26) installed on said translation device (22) to allow a translation of said pin (26) with respect to said frame (11).

8. Safety device as in any claim from 1 to 7, characterized in that it is associated with means to indicate a dangerous situation in the combustion chamber.

9. Improved heating apparatus comprising a frame (11) defining a combustion chamber, a door (12) associated with said frame (11), and a safety device (13) as in any of the claims from 1 to 8.

10. Method to open a door (12) for a heating apparatus comprising a frame (11) defining a combustion chamber, said door (12) being associated with said frame (11), and a safety device (13), characterized in that in the event of overpressure in the combustion chamber, said safety device (13) causes a partial opening of the door (12).

11. Method as in claim 10, characterized in that said safety device (13) comprises a first closing element (18) associated with said door (12), and a second closing element (19) associated with the frame (11) of the heating apparatus, at least one of either said first closing element (18) or said second closing element (19) being mobile to determine a normal closed condition and a normal open condition, wherein at least one of either said first closing element (18) and/or said second closing element (19) is installed translatable with respect to said door (12), or respectively with respect to said frame (11), in a controlled and desired manner, on at least a translation device (22) configured to determine a translation of said first closing element (18) and/or said second closing element (19) and to determine a partly open condition of said door (12), in the event of overpressure in the combustion chamber.

Drawing