Steam Iron Comprising a Heating Body Provided with a Steam Chamber and an Ironing Surface Thermally Connected to the Heating Body

Abstract

Steam iron comprising a heating body (3) comprising a steam chamber (32) and an ironing surface (52) connected thermally to the heating body (3), the ironing surface (52) being designed to come into contact with the fabric to be ironed, and being advantageously provided with steam release holes (50), the heat produced by the heating body (3) being transferred to the ironing surface (52) by conduction through at least two components (3, 4) of the iron, pressed together, characterized in that the two components (3, 4) are in direct contact with one another at at least one point of contact (40A) with a contact surface area of less than 2 mm.sup.2 and preferably less than 1 mm.sup.2.

Claims

1. Steam iron comprising a heating body comprising a steam chamber and an ironing surface thermally connected to the heating body, the ironing surface being designed to come into contact with the fabric to be ironed and being provided with steam release holes, heat produced by the heating body being transferred to the ironing surface by conduction through at least two components of the iron, pressed against one another, wherein the two components are in direct contact with one another at at least one point of contact with a contact surface area of less than 2 mm.sup.2.

2. Iron according to claim 1, wherein the two components are in direct contact with one another at several points of contact, all of the points of contact having a contact surface area of less than 2 mm.sup.2.

3. Iron according to claim 1, wherein the iron comprises at least three points of contact between the two components.

4. Iron according to claim 1, wherein the points of contact are situated at an end of protrusions extending beyond one surface of at least one of the components.

5. Iron according to claim 4, wherein the protrusions are obtained by a stamping process.

6. Iron according to claim 4, wherein one or more protrusions extend to a height of over 0.3 mm.

7. Iron according to claim 1, wherein a steam distribution chamber is arranged between the two components.

8. Iron according to claim 7, wherein a gasket is positioned between the two components at a periphery of the distribution chamber.

9. Iron according to claim 1, wherein the iron includes a soleplate which comprises a plate that is pressed against the heating body and wherein the at least one point of contact is situated at an interface between the heating body and the plate.

10. Iron according to claim 9, having a plurality of points of contact which are distributed along a periphery of the ironing surface.

11. Iron according to claim 9, wherein said plate is made of aluminum.

12. Iron according to claim 11, wherein the iron comprises a cap, made of stainless steel, which is connected to said plate, wherein the ironing surface is supported by said cap.

13. Iron according to claim 12, wherein the plate is attached to the heating body by means of screws, the cap being attached to the plate by folding edges of the cap over edges of the plate.

14. Iron according to claim 12, wherein the plate has openings arranged facing steam release holes in the cap.

15. Iron according to claim 1, wherein the heating body is a casting encapsulating an electric resistor.

16. Iron according to claim 1, wherein the two components are in direct contact with one another at several points of contact, all of the points of contact having a contact surface area of less than 1 mm.sup.2.

17. Iron according to claim 1, wherein the iron comprises between 10 and 30 points of contact between the two components.

18. Iron according to claim 4, wherein one or more protrusions extend to a height of between 0.4 mm and 0.8 mm.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The objectives, aspects and advantages of this invention will be better understood through the description provided below of one particular embodiment of the invention, presented as a non-limiting example, in reference to the attached drawings, in which:

[0033] FIG. 1 is a perspective view of an iron according to one particular embodiment of the invention;

[0034] FIG. 2 is a longitudinal cross-section view of the soleplate of the iron in FIG. 1;

[0035] FIGS. 3A and 3B are enlarged views of the cross-section view in FIG. 2, at one point of contact and of an attachment screw, respectively;

[0036] FIGS. 4 and 5 are respectively, top and bottom exploded perspective views of the soleplate of the iron in FIG. 1;

[0037] FIG. 6 is a view from above of the soleplate in FIG. 2;

[0038] FIG. 7 is a perspective view from above of the plate equipping the iron in FIG. 1; and

[0039] FIG. 8 is a cross-section view of the plate along the line VIII-VIII in FIG. 7.

DETAILED DESCRIPTION OF THE INVENTION

[0040] FIG. 1 represents an iron comprising a casing (1) made of plastic, comprising a handle and a heel on which the iron can rest vertically. The casing (1) encapsulates, in a self-explanatory manner, a reservoir provided with a refill opening (10) and comprises a cord (11) for supplying electricity to the iron through a 220 V residential network.

[0041] As shown in FIGS. 2 through 6, the iron comprises a soleplate (2) comprising a heating body (3) made of cast aluminum including a tubular electric resistor (30) that can reach 2300 W of power and that is the only heating element of the iron. The power supply to this electric resistor (30) is regulated by a thermostat, not depicted in the drawings, which is attached to a housing (31) arranged on an upper surface of the heating body (3), the thermostat being advantageously regulated around a setpoint temperature of 165° C., which cannot be adjusted by the user.

[0042] As shown in FIGS. 4 and 6, the upper surface of the heating body (3) comprises protruding walls that define a steam chamber (32) supplied with water from the reservoir by a pump or a drip valve, not depicted in the drawings, and steam distribution channels (33) extending along the periphery of the steam chamber (32), these channels (33) meeting at the front end of the heating body (3).

[0043] The channels (33) comprise throughways (33A) passing through the heating body (3) and leading to a cavity arranged on the lower surface of the heating body (3) forming a steam distribution chamber (34).

[0044] The soleplate (2) comprises, beneath the heating body (3), an intermediate plate (4), advantageously made of aluminum, the upper surface of which comes into contact with the heating body (3) and defines one boundary wall of the steam distribution chamber (34).

[0045] The soleplate (2) also comprises a metal cap (5), advantageously made of stainless steel, which is pressed against the lower surface of the plate (4), the metal cap (5) coming into direct contact with the plate (4) and being advantageously attached to the latter by bending the peripheral edge of the cap (5) around the peripheral edge of the plate (4).

[0046] The cap (5) comprises, in a self-explanatory manner, a flat lower surface that defines an ironing surface (52) designed to come into contact with the fabric to be ironed. This ironing surface (52) is advantageously provided with over two hundred steam release holes (50) with a throughway section of less than 4 mm.sup.2, as described in greater detail in patent application EP 1 772 551 filed by the applicant. The steam release holes (50) are advantageously distributed along a first and second network of steam release holes (50) separated from one another by a median zone (51) without any steam release holes.

[0047] As shown in FIGS. 3A, 4 and 5, the plate (4) comprises several bosses (40) in relief, the upper ends of which form points of contact (40A) between the plate (4) and the heating body (3), the heating body (3) comprising, facing each of these bosses, a stop (35) provided with a flat surface against which the boss (40) abuts when the plate (4) is assembled against the heating body (3).

[0048] These bosses (40) are preferably made by a stamping process in the plate (4) and have a roughly spherical upper surface.

[0049] Each boss (40) advantageously protrudes to a height on the order of 0.6 mm above the upper surface of the plate (4). A silicone gasket (6), depicted in FIGS. 5 and 7, is placed between the plate (4) and the heating body (3) over the entire perimeter of the distribution chamber (34) to ensure imperviousness to steam, this silicone gasket (6) also being 0.6 mm thick.

[0050] The upper end of each boss (40) forms a point of contact (40A) that has a contact surface area of less than 2 mm.sup.2 and preferably less than 1 mm.sup.2. In the particular example of embodiment depicted in the drawings, the plate (4) has a thickness on the order of 2 mm and comprises seventeen bosses (40) distributed over the periphery of the plate (4), the bosses (40) having a contact surface with the stops (35) consisting of a circular surface with a diameter on the order of 1 mm.

[0051] Preferably, the contact surfaces of the bosses (40) are the only areas where the plate (4) is directly in contact with the heating body (3), such that the heat transfer by conduction between the heating body (3) and the plate (4) occurs only through these bosses (40).

[0052] Advantageously, the plate (4) is attached against the heating body (3) by three screws (7), shown in FIG. 5, one of the screws (7) being arranged near a front tip of the soleplate (2) and the two other screws being arranged symmetrically on the edge of the plate (4) in the back part of the soleplate (2).

[0053] As shown in greater detail in FIG. 3B, the plate (4) is not in direct contact with the heating body (3) in the location of the screws (7) in order to limit the thermal transfer by conduction in that area.

[0054] As shown in FIG. 5, the heating body (3) also comprises grooves (36, 37) that protrude into the steam distribution chamber (34), these grooves (36, 37) being situated in a median zone of the soleplate (2) and facing a median zone (41) of the plate (4) without holes. The height of these grooves (36, 37) is adapted so that they do not come into direct contact with the plate (4) when the plate (4) is assembled onto the heating body (3) with the bosses (40) abutting the stops (35), a silicone gasket, not depicted in the drawings, being present to fill the resulting space between the grooves (26, 27) and the plate (4) to ensure a mechanical connection between the plate (4) on the heating body (3) in addition to the attachment screws.

[0055] In the particular example of embodiment depicted, the grooves (36, 37) consist of a first groove (36) being generally U-shaped, and a second groove (37) being generally V-shaped, each of these grooves (36, 37) having a recess forming a cavity into which the silicone gasket is injected, this gasket covering the grooves (36, 37) to a height of 0.5 mm, to come into contact with the plate (4) and to help attach said plate.

[0056] The plate (4) comprises, on either side of the median zone (41), openings (42, 43) making it possible to diffuse the steam from the distribution chamber (34) toward the cap (5), the cap (5) comprising, facing each opening (42, 43), at least one steam release hole (50).

[0057] Advantageously, most of the openings (42) of the plate (4) have a diameter corresponding roughly to the diameter of the steam release hole (50) of the cap (5) facing it, such that the plate (4) is in direct contact with the cap (5) near the steam release holes (50) and can transfer the heat by conduction in this area.

[0058] Certain openings (43) on the plate (4) can nevertheless have a larger surface area to limit local heat transfer by conduction. Thus, in the example depicted, the plate (4) comprises three larger openings (43) situated near the front tip, in the central area of the soleplate (2) and near the back part of the plate (4), respectively, each of these openings supplying several steam release holes in the cap (5).

[0059] The iron thus produced offers the advantage of possessing a cap (5) provided with an ironing surface with a relatively even temperature on the order of 140° C. when the steam chamber (32) is at a temperature on the order of 165° C., making it possible to produce a continual flow of steam on the order of 35 g/min.

[0060] Indeed, in the construction of the soleplate (2) thus produced, the thermal transfer by conduction between the heating body (3) and the plate (4) is limited to only the points of contact (40A) situated at the end of the bosses (40), said bosses having a very small surface area, the rest of the heat transfer occurring by radiation through the distribution chamber (34). The significant number of points of contact (40A) and their small surface area make it possible to have excellent control of the heat flow established by conduction between the heating body (3) and the plate (4). Moreover, the significant number of points of contact (40A) also make it possible to obtain good control of the distance separating the bottom of the cavity forming the distribution chamber (34) and the plate (4), which makes it possible to have excellent control of the heat flow established by radiation between the heating body (3) and the plate (4).

[0061] Finally, such points of contact (40A), held by bosses (40) made by stamping the plate (4), offer the benefit of being very inexpensive to produce. They also offer the advantage of being very small in size, making it possible to obtain a very compact soleplate (2) construction.

[0062] Moreover, the presence of the aluminum plate (4), which possesses high thermal conductivity, also helps to improve the evenness of the temperature on the ironing surface. Indeed, if a temperature gradient appeared between different points of the plate (4), it would quickly be attenuated by the thermal transfer that is then established in the thickness of the plate (4).

[0063] Thus obtained is an iron with a compact construction that is inexpensive to implement and with a temperature on the ironing surface that is roughly constant at around 140° C., for ironing all types of textiles without damaging them. In addition, such a construction makes it possible to maintain the temperature of the heating body in the immediate vicinity of the steam chamber at around 165° C., which makes it possible to produce a continuous steam output on the order of 35 g/min that is sufficient to ensure great efficacy in ironing.

[0064] Of course, the invention is in no way limited to the embodiment described and depicted, which has been provided only as an example. Modifications remain possible, particularly with regard to the makeup of the various components or by substituting equivalent techniques, while still remaining within the scope of protection of the invention.

[0065] Thus, in one embodiment variation not depicted, the bosses in relief can be made by molding, and said bosses can be produced on the heating body rather than on the plate.

[0066] Thus, in one embodiment variation not depicted, the aluminum plate/stainless steel cap set could be replaced by a single aluminum plate, the lower surface of which directly constitutes the ironing surface.

[0067] Thus, in one embodiment variation, the iron may comprise a heating element, the power of which is limited to 1600 W when the residential electrical network is on the order of 120 V.