ES2819948T3 - Domestic electric heating appliance that includes at least one flat hollow bar in which an electric heating element is housed - Google Patents

Abstract

Domestic electric heating appliance that includes at least one vertical upright (2) on which is fixed at least one hollow and flat bar (3) that has two longitudinal edges (32a, 32b) and two transverse edges (33), being housed in said bar an electric heating element (4), - the electric heating element (4) is a cord formed by two rectilinear heating sections (4a, 4b) connected by a curved section (4c), - the bar (3) includes designs ( 31a, 31b) each to receive one of the rectilinear sections (4a, 4b) of the cord (4), characterized in that: - the cord has a cover with double electrical insulation, - the curved section (4c) has a lesser thickness than those of the rectilinear sections (4a, 4b), - the bar (3) includes a design to receive the curved section (4c) so that the assembly of said cord is housed in said bar, - the bar (3) includes said designs to receive each of the rectilinear sections of the cord in the form of two internal housings (31a, 31b) parallel to the longitudinal edges (32a, 32b), the rectilinear sections (4a, 4b) of the cord (4) being housed respectively in one of said housings, the curved section (4c) being located in one of the transverse edges (33) of said bar, - the two internal housings (31a, 31b) are separated at least by a partition (34, 34a, 34b) whose upper edge (340, 340a, 340b) is separated from the internal wall of the bar (3), - the distance (d) between the inner wall of the bar (3) and the upper edge (340, 340a, 340b) of the partition (34, 34a, 34b) is greater than or equal to the thickness of the section curved (4c) and less than the respective thickness of each rectilinear section (4a), 4b) so that said curved section (4c) is housed in the space that separates said upper edge (340, 340a, 340b) from said internal wall , said partition (34, 34a, 34b) preventing the rectilinear sections (4a, 4b) from leaving their respective housing (31a, 31b).

Description

DESCRIPTION

Domestic electric heating appliance that includes at least one flat hollow bar in which an electric heating element is housed

Technical field of the invention.

The object of the invention is a domestic electric heating appliance that includes at least one hollow bar in which an electric heating element is housed.

It refers to the technical field of electric heating systems intended to be installed in a home or office, and more particularly, but not exclusively, to the technical field of towel dryers.

State of the art.

An electric towel dryer generally includes one or more flat and hollow drying bars arranged horizontally and fixed to one or two vertical posts, each drying bar containing an electric heating element. An electric towel dryer of this type is described, for example, in patents EP-1,381,255 (MULLER), EP-1,797,806 (CALTHERMIC), DE29802057U1 (DUSAR KUNSTOFF METAL) or CN201759459U (GENGBING).

Electric heating elements are of growing interest, in particular because of their rapid increase in temperature, which reduces heating time and, therefore, electricity consumption, and the thermal homogeneity obtained, which provides, in addition to optimal drying of the towels or other white clothes and excellent thermal comfort felt by users.

The heating elements, or heating cores - or heating bodies - are independent and are respectively housed inside the hollow bars, these elements being electrically connected to an electrical supply by means of a control and regulation box (thermostat that regulates the time and / or the heating temperature) associated, for example, with one of the uprights.

Current standards require considering double electrical insulation for heating elements. However, flat metal bars, with a hollow, rectangular cross section, leave only a small distance (about ten millimeters) between their opposite and parallel walls. Therefore, this reduced distance does not make it possible to obtain a sufficient distance in the air for double electrical insulation of the heating elements.

In addition, towel dryers with flat drying bars must be equipped with double insulated electric heating elements.

From patents US-4204316 (ACRA ELECTRIC) or US-3808573 (EMERSON ELECTRIC), heating elements that include a bare resistive wire wound around an insulating support sheet are known. Two other insulating sheets sandwich the support sheet with resistive wire, covering it in its entirety to provide a first electrical insulation. The second electrical insulation is obtained by insulating pieces or insulating ties between the metallic body of the radiator and the two sheets of the heating core.

Although the use of a resistive wire is interesting as it is inexpensive and can withstand high temperatures, this double electrically insulated heating element is not particularly suitable for the flat, thin drying bars of towel dryers. In fact, the heating element is difficult to fit inside the flat and hollow bars due to the overall size too large. Additionally, certain models of electric towel dryers have flat and warped drying bars, requiring heating elements that have some flexibility to accommodate the curvature imposed by the drying bars. Furthermore, the electrical insulation of this type of heating element is not ensured when water or steam appears on the hollow bar.

Patent document WO2007 / 120004 (SOLCO BIOMEDICAL) describes a heating cord formed by rectilinear sections connected by curved sections. However, this cord is used in a heating mattress. This patent document is silent on the integration of such a heating cord into a flat, hollow rod.

The present invention aims to remedy these disadvantages. In particular, the object of the invention is to offer an electric heating appliance whose design makes it possible to guarantee the electrical insulation of the heating element.

Another objective of the invention is to allow an easy mounting of the heating element inside a flat and hollow bar, despite its small thickness and / or the curvature of the latter.

A further objective of the invention is to increase the service life of the heating elements installed in the bars. Still another object of the invention is to optimize heat transmission between the heating element and the bar. The invention also aims to provide a towel dryer whose design is simple and is quick to assemble.

Disclosure of the invention.

The solution proposed by the invention is a domestic electric heating appliance according to claim 1.

The use of such a heating cord guarantees double electrical insulation, even if water or steam enters the bar. It also allows easy mounting of the cord on the bar, even if the bar is thin and / or curved. Furthermore, thanks on the one hand to the configuration of the heating cord and, on the other hand, to the designs provided in the bar, all the sections of the cord are completely housed inside the bar, which has the effect of locating and concentrate calorie dissipation solely on the bar.

Other advantageous features of the invention are listed below. Each of these features can be considered on its own or in combination with the salient features defined above, and can be the subject, if necessary, of one or more divisional patent applications:

- The two internal housings are separated by two parallel partitions, each having an upper edge separated from the internal wall of the bar; the partitions defining a central channel on each side of which the two housings are located; and the distance between the internal wall of the bar of the upper edge of the partitions is greater than or equal to the thickness of the curved section and less than the respective thickness of each straight section, so that said curved section is housed in the space that separates said inner wall of the upper edges, said partitions preventing the straight sections from coming out of their respective housing.

- A temperature probe and / or a thermal breaker can be housed in the central channel, the thickness of the probe and / or thermal breaker being greater than the distance between the inner wall of the bar and the upper edges of the partitions.

- The two internal housings can be separated by a single partition.

- Advantageously, the curved section is located at one of the transverse edges of the bar, the transverse edge of which is closed by means of a plug that keeps said curved section in position on said bar.

- Each of the rectilinear sections of the cord can be associated with a heat sink, which heat sinks are installed on the bar to be in close contact with the internal wall of said bar.

- The bar is preferably formed by an extruded profile.

- Preferably, each of the rectilinear sections of the cord is formed by means of a flexible heating cord that has a double electrical insulation cover, the cords being connected to each other by a non-heating flexible electrical cable that has a double electrical insulation jacket and that forms the curved section. - In a variant of embodiment, each of the rectilinear sections of the cord is formed by means of a flexible heating cord that has a double electrically insulated cover, the cords of which are connected to each other by means of a flexible heating cord that has a double-insulated cover. electrical insulation and that forms the curved section.

- The rectilinear sections of the cord can have the same or different thicknesses.

- The curved section of the cord is preferably located on one of the transverse edges of the bar; and holes are provided in the bar at the transverse edge that is located opposite the transverse edge where the curved section is located, the rectilinear sections ending at the electrical connection ends that exit said bar through said holes.

- The apparatus is preferably an electric towel dryer, the bars being drying bars.

Description of the figures.

Other advantages and characteristics of the invention will become clear on reading the description of a preferred embodiment below, with reference to the attached drawings, made by way of indicative and non-limiting examples and in which:

- figure 1 is a front view of a towel dryer according to the invention,

figure 2 is a schematic view in longitudinal section of a bar according to the invention,

figure 3a is a schematic sectional view according to A-A of the bar of figure 2, said bar being associated with an upright of the towel dryer,

- figure 3b is a partial enlarged view of figure 3a showing in detail the connection between the bar and the upright,

figure 4 is an exploded view showing the different constituent elements of a bar according to the invention,

- figure 5 is a perspective view of a heating cord according to the invention,

- figure 6 shows the heating cord of figure 5, each rectilinear section being associated with a heat sink,

- figure 7 is a perspective view of a curved bar according to the invention,

figure 8 is an enlarged view of the section according to B-B of the bar of figure 2,

figure 9 is an enlarged view of the section according to B-B of the bar of figure 2, in a variant of embodiment,

Figure 10 is an enlarged view of the section according to B-B of the bar of Figure 2, in another variant of embodiment.

Preferred embodiments of carrying out the invention.

Figure 1 shows an example of a towel dryer 1 according to the invention. This towel dryer 1 includes a vertical upright 2 or pole, which serves, for example, as a wall bracket. In Figures 3a and 3b, the upright 2 is made up of a hollow profile, preferably made of a light alloy of the aluminum type, but which can be made of another rigid material such as a composite material. For example, it has a width between 2 and 20 cm and a height between 50 and 250 cm. The fixing means 20 (Figures 3a and 3b) allow the upright 2 to be hung on a wall such as a wall, a door or even a wall shelf. These fixing means 20 may be in the form of a rail adapted to receive one or more fixing legs.

One or more flat drying bars 3 are attached to the upright 2. These bars 3 are arranged horizontally and parallel to each other. A transverse end of the bars 3 is made integral with the upright 2 by any suitable fixing means, such as adjusting, welding, screwing, etc.

The bars 3 have, in the representation illustrated in the attached figures, an almost rectangular, elongated, straight (Figures 1 to 4) or slightly convated (Figure 7) shape, with a flattened, hollow rectangular cross-section. Therefore, the opposite and parallel side walls 30 of each bar 3 provide a large heating surface compared to bars of circular cross section.

The side walls 30 can be smooth or have elements in relief, such as grooves, for example, these elements in relief make it possible to increase the heat exchange surface.

Each bar 3 has two longitudinal edges 32a, 32b and two transverse edges 33. These edges 32a, 32b, 33 delimit with the side walls 30, an internal space that forms a housing or cavity 31 for receiving and mounting the electric heating element Four.

The bars 3 are preferably made of a heat conducting material, typically steel, cast iron, zinc alloy (Zamak) or aluminum. However, they could be made of a non-metallic material of the polymer or composite type. By way of example, its length (distance between the transverse edges 33) varies from 15 cm to 1 m, its height (distance between longitudinal edges 32a, 32b) varies from 5 cm to 20 cm, and its thickness (distance between side walls 30) varies from 2 mm to 2 cm.

The bars 3 are preferably obtained by an extrusion process, and therefore each one is formed by an extruded profile. The direction of extrusion is parallel to the longitudinal edges 32a, 32b. As the bar 3 is extruded, the transverse edges 33 are open. They are closed with removable plugs 330 which can be made of a plastic material. In practice, these plugs 330 fit in the 3300 designs provided for this purpose on bar 3 (Figures 8 to 10).

In the example illustrated in figure 1, the bars 3 are arranged in several separate groups, so that the space between these groups allows the placement of several towels. On the other hand, the vertical upright 2 is rigidly connected, for its part, to all the groups of bars 2.

As regards the control and regulation block 6 - or thermostat - which affects, in particular, the operating time and power of the towel dryer 1, it is mounted on the vertical upright 2, advantageously on top of the latter. , which facilitates its use as it is located in height.

Each bar 3 contains a heating element 4. As shown in figure 1, the different heating elements 4 are connected to each other, preferably in series, and to the thermostat 6. The electrical cables 61 that allow powering the heating elements 4 pass to the internal cavity of upright 2.

As shown in Figure 5, the heating element 4 is in the form of a flexible cord with a double electrically insulated cover. In practice, the cord 4 comprises an electrical resistance surrounded by a double sheath of flexible silicone. This design allows to satisfy the requirements of reduced size imposed by the flat bars 3 and the current regulations that require double electrical insulation. In addition, since the cord 4 is intrinsically double-insulated, the latter is preserved even if water or steam is introduced into the interior of the rod 3. Therefore, it is not necessary to provide a special seal on the plugs 330, thus that allows to simplify the design and reduce manufacturing costs.

The cord 4 is formed by two rectilinear heating sections 4a, 4b connected by a curved section 4c. By "rectilinear" it is meant that the sections 4a and 4b extend along the length of the bar 3 parallel, or almost parallel, to the longitudinal edges 32a, 32b. When cord 4 is installed on bar 3, it takes the shape of a U.

The rectilinear sections 4a, 4b are connected at one of their ends to the curved section 4c, the connections being isolated and sealed by heat-shrink covers 40. Its other end is connected to an electrical power cable 61 that allows the connection of the cord 4 to the other cords from appliance 1 and / or thermostat 6. Connections to power supply cables 61 are also insulated and sealed with heat shrink covers 40. Cables 61 are non-heating cables.

As shown in Figures 3b, 4 and 7, holes 610 are provided in bar 3 to draw cables 61 out of said bar. The holes 610 are located in the transverse edge 33, which is located opposite the other transverse edge 33 where the curved section 4c is located.

In Figures 2, 3a and 4, once the cord 4 is installed on the bar 3, the rectilinear sections 4a, 4b extend along the entire length of said bar. Its length corresponds almost to that of bar 3. By "almost" it is meant that the length of the rectilinear sections 4a, 4b is equal to or slightly less, for example, by a few millimeters or centimeters, than that of bar 3.

The curved section 4c, on the other hand, extends for its part in the height of the bar 3. Its length corresponds almost to the height of the bar 3. By "almost" it is meant that the length of the curved section 4c is equal to or slightly lower, for example, by a few millimeters or centimeters, than the height of the bar 3. However, the length of the curved section 4c can be greater than the height of the bar 3 insofar as said section is curved.

The straight sections 4a, 4b are each formed by a flexible heating cord having a double electrically insulated cover of the type comprising an electrical resistance surrounded by a double flexible silicone-based cover. These cords have a circular cross section, and have a diameter - or thickness - for example, between 4 mm and 10 mm, this thickness being less than that of bar 3. They could have a square, rectangular, oval or other cross section. .

The rectilinear sections 4a, 4b are preferably identical to dissipate the same heating power, and have the same thickness. However, they could have different thicknesses so that they do not provide the same heating power. For example, the straight section 4a, which is located at the upper longitudinal edge 32a of the bar 3, can provide greater heating power than that provided by the rectilinear section 4b, which is located at the lower longitudinal edge 32b. In fact, during use, a damp towel or cloth is intended to rest at the upper longitudinal edge 32a and it may be advantageous to further heat that edge and / or the area of the side walls 30 located near that edge. In fact, the rectilinear section 4a may have a thickness greater than the rectilinear section 4b.

The curved section of 4c is preferably in the form of a flexible non-heating electrical cable. This cable is sheathed with double electrical insulation to meet the requirements of current standards requiring double electrical insulation. It allows the rectilinear sections 4a and 4b to be connected to each other. This electric cable has a circular cross section, and has a diameter - or thickness - for example, between 1 mm and 5 mm, this thickness being less than that of the bar 3. It could have a square, rectangular, oval or oval cross section. other.

As shown in the attached figures, the curved section 4c is located on one of the transverse edges 33 of the bar 3. From a practical point of view, it is not necessary to heat this transverse edge 33 to dry an installed damp towel or cloth. at bar 3. The heating of the side walls 30 is sufficient. The use of a non-heating curved section 4c therefore avoids unnecessarily heating this transverse edge 33 and the cap 330 that closes it.

However, if this were useful, one might consider using a heating curved section 4c to dissipate the calories at the transverse edge 33. In this case, the curved section 4c is in the form of a flexible heating cord having a double insulated cover. electrical of the type comprising an electrical resistance surrounded by a double flexible silicone-based cover. This cord has a circular section, and has a diameter - or thickness - for example, between 1 mm and 5 mm. It could have a square, rectangular, oval or other cross section.

Whether the curved section 4c is in the form of a non-heating electrical cable or a heating cord, its thickness - or diameter - is less than that of the rectilinear sections 4a, 4b.

The cords 4 are preferably powered with 24 volts or 230 volts. Their respective heating power is, for example, between 25 W and 2000 W. The heating is distributed over all the bars 3 and thus allows a good distribution, and therefore a better optimization, of the heating power of the unit. towel dryer 1.

The bar 3 includes designs that allow each of the rectilinear sections 4a, 4b to be received. Another design is provided to receive the curved section 4c. As this will now be described in more detail, these designs are arranged so that the entire cord 4 is integrally housed in the cavity 31 of the bar 3.

In Figure 8, the bar 3 includes two internal housings 31a, 31b. These housings are parallel to the longitudinal edges 32a, 32b and extend over the entire length of the bar 3. They can be located on the longitudinal edges 32a, 32b or more offset towards the center of the side walls 30 as shown in the figures attached. Each receives one of the rectilinear heating sections 4a, 4b. These housings 31a, 31b have a rectangular or square cross section. Their height and width can be adjusted to the thickness of the rectilinear sections 4a, 4b so that the latter are firmly held in the housings 31a, 31b. This configuration has the advantage of keeping the straight sections 4a, 4b pressed against the inner wall of the bar 3, thus favoring the transfer of calories towards the side walls 30.

In Figure 8, the cross section of the housings 31a, 31b has dimensions greater than the thickness of the rectilinear sections 4a, 4b. This makes it possible to facilitate the positioning of the rectilinear sections 4a, 4b that only have to slide in their respective housings 31a, 31b.

The two internal housings 31a, 31b are separated by two parallel partitions 34a, 34b that define a central channel - or groove - on each side of which the two so-called housings are located. The partitions 34a, 34b are parallel to the longitudinal edges 32a, 32b and extend over the entire length of the bar 3. They are separated from each other by a distance, for example, between 2 mm and 30 mm. They have a thickness that corresponds almost to the thickness of the side walls 30. They are obtained during the extrusion of the profile that forms the bar 3, the extrusion row being configured to conform the designs of the cavity 31.

The partitions 34a, 34b extend perpendicular to the extrusion direction, that is, perpendicular to the side walls 30. However, they do not extend the full thickness of the bar 3. In fact, each has a top edge 340a, 340b which is separated from the inner wall of the bar 3.

The distance "d" that separates the inner wall of the bar 3 and the upper edges 340a, 340b is greater than or equal to the thickness of the curved section 4c, but less than the respective thickness of each rectilinear section 4a, 4b. For example, a distance "d" between 3 and 4 mm is compatible with a curved section 4c having a thickness of 2 to 3 mm, and with rectilinear sections 4a, 4b having a thickness of 5 to 6 mm.

This geometry is particularly advantageous insofar as the rectilinear sections 4a, 4b remain positioned in their respective housings 31a, 31b. In fact, their thickness being greater than the distance "d", the partitions 34a, 34b prevent them from leaving their housing 31a, 31b. The two rectilinear sections 4a, 4b are thus constantly separated to avoid any zone of overheating that could cause premature aging of the cord 4.

Furthermore, the curved section 4c can be housed in the space located between the inner wall of the bar 3 and the upper edges 340a, 340b. The plug 330 makes it possible to keep the curved section 4c in position in this space.

The entire cord 4, including the curved section 4c, can therefore be housed inside the bar 3. This is particularly advantageous, insofar as the transverse edge 33 of the bar 3, where the curved section is located 4c, it can be easily closed by means of a plug 330 and left free, without it being necessary to fix it to a second vertical upright to house a part of the cord 4 that would protrude outside this transverse edge 33.

A temperature probe 5, and / or a thermal breaker, can be housed in the central channel delimited by the two partitions 34a and 34b. The temperature probe 5 and the thermal circuit breaker must be moved away from the rectilinear heating sections 4a, 4b in order to be able to correctly measure the temperature of the bus 3. Therefore, they cannot leave the central channel. For this reason, it is envisaged that the thickness of the probe 5 and / or the thermal breaker is greater than the distance "d" mentioned above. Therefore, the central channel has a double function: not only does it allow the two rectilinear sections 4a and 4b to be kept at a distance, but it also serves as a housing for any type of measuring and / or safety device.

In the embodiment of figure 9, the two internal housings 31a, 31b are separated by a single partition 34. The latter is similar to the partitions 34a, 34b described above and obtained during the extrusion of the profile that forms the bar 3. It is parallel to the longitudinal edges 32a, 32b and extends over the entire length of the bar 3. It is located in the center of the side walls 30 and has a thickness that corresponds almost to the thickness of the latter.

The partition 34 extends perpendicular to the direction of extrusion of the bar 3, that is, perpendicular to the side walls 30, however, it does not extend over the entire thickness of said bar. In fact, it has an upper edge 340 that is spaced from the inner wall of the bar 3.

The distance "d" that separates the inner wall of the bar 3 from the upper edge 340 is greater than or equal to the thickness of the curved section 4c, but less than the respective thickness of each rectilinear section 4a, 4b. For example, a distance "d" between 3 and 4 mm is compatible with a curved section 4c having a thickness of 2 to 3 mm, and with rectilinear sections 4a, 4b having a thickness of 5 to 6 mm.

As already mentioned previously, the partition 34 prevents the rectilinear sections 4a, 4b from coming out of their respective housings 31 a, 31 b, and allows the curved section 4c to come to house in the space between the internal wall of the bar 3 and the upper edge 34 at one of the transverse edges 33. In this configuration with a single partition 34, the entire cord 4 can be fully accommodated in the bar 3.

As mentioned above, to minimize the increase in temperature of the cord 4 and favor the transfer of calories to the side walls 30, it is advantageous that the heating sections 4a and 4b are in contact with the internal wall of the bar 3 , at least on one of the side walls 30, more particularly the one that, during use, is not located in front of a wall or support, but faces the user (the side wall 30 which is visible in figure 1). Furthermore, when the section of the housings 31a, 31b has dimensions greater than the thickness of the rectilinear sections 4a, 4b, it is envisaged that the latter are each associated with a heat sink 7.

With reference to the embodiment of Figures 4, 6 and 10, each heatsink 7 is manufactured in two parts 7a and 7b designed in a heat conducting material of the type mentioned above with reference to the bar 3. The two parts 7a and 7b can be manufactured with the same or different materials in such a way as to favor the diffusion of the calories towards one or the other of said parts, and in practice towards the part that is in contact with the inner wall of the bar 3.

The first part 7a consists of an elongated piece, for example, obtained by molding, stamping or extrusion, the length of which corresponds to that of the straight sections 4a, 4b. It is designed so that its external surface is in close contact with the internal wall of the bar 3 which is opposite one of the side walls 30 and has a profile that coincides with that of said internal wall. The first part 7a comprises a flat surface whose width corresponds to that of the internal housings 31a, 31b. Its internal structure is adapted to receive a rectilinear section 4a, 4b. For example, a slot is provided for this purpose, which slot is made over the entire length of the first part 7a and comprises a complementary section of the rectilinear section 4a, 4b. In this way, the internal surface of the groove is in continuous contact with the external heating surface of the rectilinear section 4a, 4b.

The second part 7b is designed to be assembled with the first part 7a. To simplify the design and the assembly / disassembly of the different elements, the two parts 7a, 7b are fixed to each other by means of a detachable connection of the obstacle connection type (for example, clasped).

The second part 7b also consists of an elongated piece obtained by molding, stamping or extrusion. Its length corresponds to that of the first part 7a and corresponds almost to that of the bar 3. The external surface of the second part 7b may be in intimate contact with the internal wall of the bar 3, but this is not necessary for a transfer. of satisfactory and acceptable calories to only one of the side walls 30 of said bar.

The internal structure of the second part 7b comprises a second longitudinal groove made along the entire length of said second part. The section of this groove is complementary to that of the rectilinear section 4a, 4b. In this way, the internal surface of the groove is in contact with the external heating surface of the rectilinear section 4a, 4b and makes it possible to cover the part of said external surface left free by the first groove of the first part 7a. In fact, the two grooves form a housing for the rectilinear section 4a, 4b, and cooperate in such a way that the entire external heating surface of said sections is in continuous contact with the body of the heatsink 7.

The set formed by the combination of a heat sink 7 and a rectilinear heating section 4a, 4b, constitutes a heating core. Since the cord 4 comprises two rectilinear sections 4a, 4b, each bar 3 therefore contains two parallel heating cores, arranged one above the other. This makes it possible to have a homogeneous temperature distribution over the entire surface of the side wall 30.

The heatsinks 7 and their different parts 7a, 7b are preferably made of aluminum. This material gives them a certain malleability that allows them to be manually inserted into a curved bar 3. They assume the curvature of the bar 3 that immobilizes them in their respective housing 31a, 31b and prevents the second part 7b from separating from the first part 7a.

This double heating core is easily inserted into bar 3 by sliding each heating core 7 / 4a and 7 / 4b into its respective housing 31a, 31a from one of the transverse edges 33, until the curved section 4c is housed in said bar passing through above the partitions 34, 34a, 34b. The two cables 61 are then passed through the holes 610 and connected to the thermostat 6 that feeds them and / or the other cables 61 of the other cords 4 of the towel dryer 1. This connection is preferably made inside the upright 2 , the latter comprising holes 210 located opposite the holes 610 when the bar 3 is fixed on said upright (figure 2).

To limit production costs, the heatsinks 7 (Figures 8 and 9) can be eliminated. In this case, each rectilinear heating section 4a, 4b constitutes a heating core. Therefore, the cord 4 continues to form a double heating core. The implantation of this double heating core in the bar 3 is identical to that described in the previous paragraph. To minimize the rise in temperature of the cord 4 and promote the transfer of calories to the side walls 30, it is envisaged that the section of the housings 31a, 31b have dimensions equal to or less than the thickness of the rectilinear sections 4a, 4b, so that the latter are in contact with the internal wall of the bar 3, at least in one of the side walls 30, more particularly the side wall 30 which is visible in figure 1.

The invention that has just been described with reference to the towel dryer 1, and in particular the cord 4, applies to other types of household electric heating appliances such as fixed or mobile auxiliary radiators having heating bars, the cords 4 being inserted in these bars.

The arrangement of the different elements and / or means and / or stages of the invention, in the embodiments described above, should not be understood as requiring such an arrangement in all implementations. In any case, it will be understood that various modifications can be made to these elements and / or means and / or stages, without departing from the spirit and scope of the invention. In particular:

- only one bar 3 can be attached to upright 2,

- several bars 3 can be fixed between two or more parallel vertical uprights,

- the bars 3 can be arranged at regular intervals along the upright 2,

- the bars 3 can be obtained by any method of manufacture suitable for the person skilled in the art, in particular by molding, in one or more parts that are assembled,

- the caps 330 can be made of metal or of any other material suitable for the person skilled in the art,

- the 4 different heating elements can be connected in parallel,

- the rectilinear section 4a may have a thickness less than the rectilinear section 4b,

- the housings 31a, 31b can have a circular, oval section or any other suitable shape for the person skilled in the art, including a shape that is complementary to that of the rectilinear sections 4a, 4b,

- the thickness of the partitions 34a, 34b, 34, can be greater or less than the thickness of the side walls 30,

- the partitions 34a, 34b, 34, can have a straight or curved section. They can be oblique, and are not necessarily parallel to the longitudinal edges 32a, 32b, nor parallel to each other,

- the two parts 7a, 7b of the heat sink 7 can be in contact with the inner wall of the bar 3 so that each side wall 30 is heated identically,

- the dissipator 7 can be used, of course, in a bar having the configuration of figure 9, that is to say, with a single partition wall.

Claims (12)

1. Domestic electric heating appliance that includes at least one vertical upright (2) on which is fixed at least one hollow and flat bar (3) that has two longitudinal edges (32a, 32b) and two transverse edges (33), being housed in said bar an electric heating element (4), - the electric heating element (4) is a cord formed by two rectilinear heating sections (4a, 4b) connected by a curved section (4c), - the bar (3) includes designs (31a, 31b) each one to receive one of the rectilinear sections (4a, 4b) of the cord (4), characterized in that: - the cord is covered with double electrical insulation, - the curved section (4c) has a thickness less than that of the rectilinear sections (4a, 4b), - the bar (3) includes a design to receive the curved section (4c) so that the assembly of said cord is housed in said bar, - the bar (3) includes said designs to receive each of the rectilinear sections of the cord in the form of two internal housings (31a, 31b) parallel to the longitudinal edges (32a, 32b), the rectilinear sections (4a, 4b) being housed ) of the cord (4) respectively in one of said housings, the curved section (4c) being located on one of the transverse edges (33) of said bar, - the two internal housings (31a, 31b) are separated by at least a partition (34, 34a, 34b) whose upper edge (340, 340a, 340b) is separated from the internal wall of the bar (3), - the distance (d) between the inner wall of the bar (3) and the upper edge (340, 340a, 340b) of the partition (34, 34a, 34b) is greater than or equal to the thickness of the curved section (4c) and less that the respective thickness of each rectilinear section (4a), 4b) so that said curved section (4c) is housed in the space that separates said upper edge (340, 340a, 340b) from said internal wall, preventing said partition (34 , 34a, 34b) that the rectilinear sections (4a, 4b) come out of their respective housing (31a, 31b). 2. Apparatus according to claim 1, wherein: - the two internal housings (31 a, 31 b) are separated by two partitions (34a, 34b) each having an upper edge (340a, 340b) separated from the internal wall of the bar (3), - the partitions (34a, 34b) define a central channel on each side of which the two housings (31 a, 31 b) are located, - the distance (d) between the internal wall of the bar (3) and the upper edge (340a, 340b) of the partitions (34a, 34b) is greater than or equal to the thickness of the curved section (4c) and less than the respective thickness of each rectilinear section (4a), 4b) so that said curved section (4c) is housed in the space that separates said internal wall from the upper edges (340a, 340b), said partitions (34a, 34b) preventing said rectilinear sections (4a, 4b) from coming out of their respective housings (31a, 31b). 3. Apparatus according to claim 2, wherein a temperature probe (5) and / or a thermal breaker is housed in the central channel, the thickness of the probe and / or thermal breaker being greater than the distance between the inner wall of the bar (3) and the upper edges (340a, 340b) of the partitions (34a, 34b). Apparatus according to claim 1, wherein the two internal housings (31a, 31b) are separated by a single partition (34a). Apparatus according to one of the preceding claims, wherein the curved section (4c) is located on one of the transverse edges (33) of the bar (3), which transverse edge is closed by means of a plug (330) that maintains said curved section in said bar. An apparatus according to one of the preceding claims, wherein the rectilinear sections (4a, 4b) of the cord (4) are each associated with a heat sink (7), which heat sinks are installed on the bar (3) so that they are in intimate contact with the inner wall of said bar. Apparatus according to one of the preceding claims, wherein the bar (3) is formed by an extruded profile. Apparatus according to one of claims 1 to 7, wherein the rectilinear sections (4a, 4b) of the cord (4) are each formed by a flexible heating cable having a double electrically insulated sheath, the strands of which are They are connected to each other by means of a non-heating flexible electrical cable that has a double electrical insulation jacket and that forms the curved section (4c). Apparatus according to one of claims 1 to 7, wherein the rectilinear sections (4a, 4b) of the cord (4) are each formed by a flexible heating cord having a double electrically insulated cover, which cords they are connected to each other by means of a flexible heating cord that has a cover with double electrical insulation and that forms the curved section (4c). Apparatus according to one of the preceding claims, wherein the rectilinear sections (4a, 4b) of the cord (4) have the same thickness or different thicknesses. Apparatus according to one of the preceding claims, wherein: - the curved section (4c) of the cord (4) is located on one of the transverse edges (33) of the bar (3), - holes (610) are provided in the bar (3) at the height of the transverse edge (33) which is located opposite the transverse edge (33) where the curved section (4c) is located, ending the rectilinear sections (4a, 4b ) at the electrical connection ends (61) that come out of said bar through said holes. Apparatus according to one of the preceding claims, consisting of an electric towel dryer, the bars (3) being drying bars