Steam iron sole plate
10844536 ยท 2020-11-24
Inventors
Cpc classification
D06F75/20
TEXTILES; PAPER
International classification
Abstract
The invention relates to a sole plate of a steam iron comprising a cover and a heating subassembly, in which the surface of the cover intended for being in contact with a garment comprises a steaming area onto which the steam outlet holes open and a drying area separate from the steaming area, the steaming area being located, at least partially, in the front third of said surface, the drying area being devoid of steam outlet holes and comprising a portion projecting outwards at the center of said surface.
Claims
1. A steam iron soleplate comprising a cover and a heating subassembly, wherein the surface of the cover intended to be in contact with a garment comprises a steaming area having the steam outlet holes emerging onto it and a drying area different from the steaming area, the steaming area being located on the front half of said surface, the drying area comprising no steam outlet holes and comprising a first step corresponding to a portion raised toward the outside at the central portion of said surface, the volume of the raised portion being inscribed between a first planar surface, coplanar with the steaming area and a second planar surface located in a plane which is parallel to the first surface.
2. The steam iron soleplate of claim 1, wherein the steaming area is located on the front third of said surface.
3. The iron soleplate of claim 1, wherein the first planar surface totally surrounds the raised portion.
4. The steam iron soleplate of claim 1, wherein the first and second surfaces are separated by a height in the range from 0.3 mm to 2 mm.
5. The steam iron soleplate of claim 4, wherein the raised portion is delimited on its sides by a third surface linking the first surface to the second surface.
6. The steam iron soleplate of claim 5, comprising, on the circumference of the cover, fourth surfaces recessed with respect to the first surface, substantially parallel to each other and contiguous to the circumference of the cover, and forming second steps.
7. The iron soleplate of claim 5, wherein the cover comprises lateral cover edges coupled to a cover heel and wherein the junction between the second surface and the third surface is defined by a first line defined by: on each side of the cover, first and second curve portions, each first and second curve portion being substantially parallel to the adjacent lateral cover edge and at a distance in the range from 25 mm to 45 mm from said lateral cover edge; at the back of the cover, a first straight line portion parallel to the cover heel and at a distance in the range from 25 mm to 40 mm from the cover heel; and at the front of the cover, a first circular portion tangent to the first and second curve portions having a radius in the range from 5 mm to 15 mm.
8. The iron soleplate of claim 7, wherein the junction between the first surface and the third surface is defined by a second line defined by a constant distance with the first line in the range from 10 mm to 25 mm, the second line comprising: a third curve portion parallel to the first curve portion; a fourth curve portion parallel to the second curve portion; a second circular portion parallel to the first circular portion; a second straight line portion parallel to the first straight line portion; a third circular portion having its center located at the crossing point of the first curve portion with the first straight line portion; and a fourth circular portion having its center located at the crossing point of the second curve portion with the first straight line portion.
9. The iron soleplate of claim 1, wherein temperature sensors are installed within hollow rivets provided in the cover or in ports provided in the subassembly.
10. The iron soleplate of claim 6, comprising fifth surfaces recessed with respect to the first surface, substantially parallel to one another and to the circumference of the cover and forming third steps, having a width in the range from 8 mm to 14 mm, and located at a distance in the range from 12 mm to 24 mm from the edge of the cover.
11. The iron soleplate of claim 10, wherein the steam outlet holes emerge onto one of the fifth surfaces.
12. The iron soleplate of any of claim 6, wherein the second steps each have a width in the range from 0.7 mm to 1.5 mm and a height in the range from 0.15 mm to 0.4 mm and wherein the second steps form leading edges.
13. The iron soleplate of claim 12, wherein the shape of the leading edges comprises a radius in the range from 0.2 mm to 0.3 mm.
14. A method of manufacturing the iron soleplate of claim 1, wherein the assembly between the cover and the subassembly is performed: for the front portion of the cover provided with steam outlet holes, by crimping of rivets extruded from the holes; for the rear portion of the cover comprising no steam outlet holes, by using hollow rivets created by extrusion from the material of the cover and by crimping ensured by local crushing of the ends of the hollow rivets, the generated deformation, by compressing the material pushed back into a chamfer, ensuring the locking between the cover and the subassembly.
15. The method of claim 14, comprising locally forming, in the rear portion of the cover assigned to drying, notches having a width in the range from 2 mm to 4 mm to form chips each having a thickness greater than a half-thickness of the cover sheet which, folded down on the edge of the subassembly, ensure the locking between the cover and the subassembly.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
(1) The foregoing and other features and advantages will be discussed in detail in the following non-limiting description of specific embodiments in connection with the accompanying drawings, in which:
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DETAILED DESCRIPTION OF THE PRESENT EMBODIMENTS
(17) The same elements have been designated with the same reference numerals in the different drawings. For clarity, only those elements which are useful to the understanding of the described embodiments have been shown and are detailed. In particular, the inner components of a steam iron are well known by those skilled in the art and will not be described in detail.
(18) In the following description, when reference is made to terms qualifying absolute positions, such as terms front, rear, top, bottom, left, right, etc., or relative positions, such as terms above, under, upper, lower, etc., or to terms qualifying directions, such as terms horizontal, vertical, etc., it is referred to the orientation of the drawings or to an iron in a normal position of use. The terms approximately, substantially, and in the order of are used herein to designate a tolerance of plus or minus 10%, preferably of plus or minus 5%, of the value in question.
(19) According to an embodiment, the steam iron soleplate comprises at least one step intended to create a surface parallel to a base surface used as a base of contact of the iron on the garment.
(20) According to an embodiment, the surface created by the step is raised with respect to the base surface. The raised surface is preferably located in the central portion of the drying area of the iron. The raised surface comprises no steaming holes and permanently bears on the garment at the same time as the base surface. The raised surface is coupled to the base surface by an intermediate surface surrounding the raised surface and joining the base surface. The intermediate surface may be planar or bulged to enable, on displacements of the iron on the garment and whatever the directions of the displacements, to chase the residual steam present in the garment towards the outside.
(21) According to an embodiment, the surface created by the step is recessed with respect to the base surface. This enables to create, on the circumferences of the recessed surface, leading edges improving the quality and the rapidity of the ironing.
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(23) The modifications made to covers 10 to 11 with respect to conventional covers can be distributed as follows:
(24) on the one hand, modifications which concern the surface of covers 10 or 11 in contact with the garment which may be identical in all points whatever the material of the cover; and
(25) on the other hand, modifications which are in relation with the fastening of the covers on their respective heating subassembly, specific to each cover type, according to their material.
(26) In
(27) The volume of raised portion 15 is defined by a substantially planar surface 17 aligned with the cover. Surface 17 is raised with respect to surface 16 and is located in a plane parallel thereto. A height h in the range from 0.3 to 2 mm separates the two surfaces 16 and 17. Surface 17 occupies a portion of the total surface area of cover 10 or 11 in contact with the garment which is in the range from 10% to 40%.
(28) A line L1, shown in stripe-dot lines in
(29) on each side, portions of curves c1 and c2 substantially parallel to their respective cover edge 19 for c1 and 21 for c2 and at a distance d1 which may be in the range from 25 mm to 45 mm, for example, equal to approximately 35 mm;
(30) in the back, a straight line portion p1 parallel to cover heel 22 at a distance d2 which may be in the range from 25 mm to 40 mm, for example, equal to approximately 30 mm; and
(31) at the front, a circular portion r1 tangent to curves c1 and c2 having a radius which may be in the range from 5 mm to 15 mm, for example, equal to approximately 8 mm.
(32) The volume of raised portion 15 is further defined by a surface 18 of connection between surface 16 and surface 17.
(33) A full line L2 shows the limits of surface 18. Line L2 is defined by a constant distance d3 between lines L1 and L2, which may be in the range from 10 mm to 25 mm, for example, equal to approximately 17 mm. This is reflected on line L2 by a curve portion c3 parallel to curve portion c1, a curve portion c4 parallel to curve portion c2, a circular portion r2 parallel to circular portion r1, a straight line portion p2 parallel to straight line portion p1, and by two new circular portions: a circular portion r3 having a center of located at the crossing portion of curve portion c1 with straight line portion p1, and a circular portion r4 having a center o2 located at the crossing point of curve portion c2 with straight line portion p2.
(34) Surface 18 of junction between the two lines L1 and L2 may be generated by the displacement of a straight line segment between the two lines, but it is preferentially defined by the circulation of a radius R having a center located on a line perpendicular to surface 17 vertically in line with line L1, defined as being the location of tangency points between radius R and surface 17. Line L2 is defined as the location of the points of intersection between radius R and surface 16.
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(36) In the drawings, one can distinguish, apart from the modifications common with cover 11, the following specific modifications of cover 10:
(37) tubular shapes which are intended, among others, to be used as hollow rivets 23 to ensure the connection between the rear portion of cover 10, assigned to the drying, and heating subassembly 12. Their number, their distribution, and their usage mode are determined according to the selected usage. Tubular shapes 23 are positioned outside of the surface occupied by the steaming chamber.
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(39) As appears in the drawings, heating subassemblies 12 and 13, made of cast aluminum overmolding a tubular heating element and comprising the steaming chamber, are modified with respect to conventional heating subassemblies as follows:
(40) for their common portion ensuring the contact with the inner portion of covers 10 and 11: their cast surface, initially planar, is modified (
(41) for the rear portion, reserved for the drying, specific to aluminum cover 10, holes 24 are provided, in front of each hollow rivet 23 (
(42) for the rear portion, intended for the drying, specific to cover 11 made of a steel sheet or of another material, the type of shape conventionally given to the edges of subassembly 13 along its contour are kept (
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(44) According to an embodiment, cover 10 and subassembly 12 may be assembled as follows:
(45) for the front portion, the tubes extruded from steam outlet holes 20 are used, the crimping being performed, for example, according to the known techniques described in patent FR2593837;
(46) for the back portion, hollow rivets 23 are used by proceeding by limited crushing of their end (visible in
(47) According to an embodiment, cover 11 and subassembly 13 may be assembled by keeping conventional methods, by the use of steaming holes 20 and the crimping of cover 11 on the circumference of subassembly 13.
(48) Before positioning the parts against each other, the precaution of coating all the surfaces intended to be in contact with thermally-conductive grease which will prevent the forming of an insulating air blade therebetween is taken.
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(50) As shown in
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(52) The maintaining in place of the sensors will be ensured by the deformation, either of the head of rivets 23 as shown in
(53) The collected information transmitted to a calculator and translated may enable to display, for example, on a liquid display screen visible by a user, the nature of the fabric that may be ironed.
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(55) The outer surface of each of the covers remains compatible with the application of known coatings, but its heat conductivity can be improved by a flash projection of boron nitride, for example, at the surface of the glaze slip before the cooking thereof.
(56) It is further desirable to obtain the disappearing of the folds of the garment during the ironing thereof.
(57) For this purpose, much research has been carried out, to result in solutions, all directed towards the improving of the iron/garment surface relations: better resistance to wearing, better sliding ability, better residual moisture discharge, or also better heat transmission.
(58) Since the ironing efficiency can be defined as the best tradeoff between the following factors: speed/quality/decreased painfulness/decreased wearing of the garment, it was remarkable to observe that most of these actions had the sole purpose of optimizing the created relations.
(59) This was neglecting the importance of the first action to which the fibers of a fabric are submitted during the ironing, which is a mechanical action of tensioning the fabric via the edge of the soleplate, which phenomenon can be observed, since any displacement of the iron generates the occurrence of a mobile ripple, parallel to this edge. With soleplates having added covers, such a traction on the fibers is decreased due, on the one hand, to the radius of curvature of their edge due to their manufacturing, and on the other hand to the decrease of their coefficient of friction on the garment. The improvements provided in these fields have actually adversely affected the rapidity of the shaping of the fibers since, for equivalent wetting conditions, obtaining straight fibers by stretching the fabric is more efficient and faster than doing it by pressing thereon to rectify them. There thus here is a possibility of improving the ironing speed.
(60) An object of an embodiment is to substantially increase the ironing efficiency by improving the fiber tension from as soon as the first movement of the soleplate on the garment.
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(63) As appears in
(64) a reference surface 113, for example, substantially planar, corresponding to the portion of the cover in permanent contact with the garment;
(65) a surface 114 and a surface 115, for example, substantially planar, substantially parallel to each other and to the edge of the cover, having widths m in the range from 0.7 mm to 1.5 mm, surfaces 114 and 115 surrounding cover 110 or 111;
(66) a surface 116, for example, substantially planar, having its limits L substantially parallel to each other and to the edge of the cover. The axis of symmetry of surface 116, having a width for example in the range from 7 mm to 16 mm, is located at a distance for example in the range from 12 mm to 24 mm from the edge of the cover. Steaming holes 120 emerge onto surface 116 and delimit its length, which will be adapted according to their number; and
(67) a surface 117, for example, substantially planar, substantially parallel to limits L of surface 116 having a width for example in the range from 0.7 mm to 1.5 mm.
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(69) Surfaces 114, 115, 116, and 117 show the basic modifications of cover 110 and 111, but other surfaces having different shapes but similar characterizations, such as for example surfaces 118 and 119, may be added according to needs.
(70) Surfaces 114 to 119 are recessed with respect to reference surface 113. They are obtained by creating steps (particularly visible in
(71) According to an embodiment, to avoid a garment wearing effect, each leading edge has a same radius r, for example, in the range from 0.2 mm to 0.3 mm, which is for example formed by die stamping and/or semishear to guarantee its dimensional regularity and a clean and flash-less surface condition.
(72) For the manufacturing of covers 110 and 111, the quality and the dimensional guarantees of the leading edges are obtained by implementing different methods according to the cover material.
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(76) According to an embodiment, heating subassembly 112, formed of cast aluminum overmolding a tubular heating element and comprising the steaming chamber, is modified in the following manner, which is valid for aluminum covers 110 as well as for covers 111 made of steel or another material.
(77) The manufacturing of the recessed portions of surfaces 116 and 117 complementarily generates, in relief with respect to the inner surface of the cover, protrusions 133 and 134, as shown in
(78) An embodiment of a method of assembling covers 110 or 111 and heating subassembly 112 will now be described.
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(81) If the selected option is that of a soleplate with separate steaming and drying areas, particularly such as described according to U.S. Pat. No. 6,189,245, a crimping by means of the steam holes in the steaming area is carried out and, for the drying area in the back portion as shown in
(82) For covers 111, whatever the selected option, current known fastening methods are kept.
(83) Before positioning the parts against each other, all the surfaces intended to be in contact will be coated with thermally-conductive grease which will prevent the forming of an insulating air film therebetween.
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(85) Various embodiments with different variations have been described hereabove. It should be noted that those skilled in the art may combine these various embodiments and variations without showing any inventive step. As an example, surfaces 114 and 115 of soleplate 105 described in relation with