EP0834266A1 - Hand held distributor for thermofusible material, in particular for depilatory wax - Google Patents

Abstract

The handheld distributor has a case (1) with an internal reservoir for a solid thermofusible material (11) stored in granular or lump form. A mechanism (2) is provided to advance the thermofusible material as it is used, and a heater is provided to melt the material. The heater (4) has a low thermal inertia and is formed by wire grille positioned across the outer surface of the thermofusible material to provided melting of the top layer of the material. The grille may be of resistance material heated electrically. A roller head fits over the end of the case, so that it is in contact with the melted material.

Description

The present invention relates to a hand held material dispenser hot-melt, in particular depilatory wax, but which can also be a cream, ointment, glue, or varnish. By hot melt, we hears all types of material taking a solid, semi-solid or pasty at room temperature, and turning into a liquid state under the action of heat, which then allows, among other things, its spreading in thin layer. In this distributor, the material stored in solid form at room temperature can be subjected to a heat flux to switch to a fluid or even liquid state for distribution in the form of a thin layer.

Usually, a dispenser comprises a housing forming a means of manual gripping, inside which a material reservoir is provided solid hot melt, such as granular wax or in the form of a bread. This reservoir may include means for pushing the wax towards its outlet, the latter leading to thin film distribution means of melted wax. These distribution means can be a conduit intermediate ending with a spout for depositing the layer directly on the application surface: usually the wearer's skin; or a volume intermediate whose exit surface leads to a transfer surface application means, such as a diaper transfer roller.

The reservoir, the means of distribution and / or transfer and application are in thermal relation with heating means to melt all or only the front portion of the wax is present so that it once liquid, it flows out of the distribution means in the form of a layer or a more or less thick strip depending on the speed of either displacement of the dispenser directly above the application surface, or the speed of the peripheral transfer surface of the roller. Once the strip of wax applied to the skin, a strip of gauze is placed on it or plastic becoming integral with the wax once cooled and solidified. Tearing off the strips causes the trapped hairs to be extracted.

A first type of distributor allows the relatively rapid fusion of the end of a wax stick pushed through a hot nozzle whose temperature is controlled and the orifice serves as a distributor of points or wax lines.

In document EP-A-0055157 is described such a type of dispenser particularly intended for facial hair removal, and in which the wax under stick shape contained in a tank is pushed manually into a duct whose first straight part is surrounded by a resistor heating. The wax once melted flows in the second part bent intermediate of the conduit opening into a dispensing orifice. To to prevent the molten wax from cooling during its passage through the second part, this conduit is made of a good conductive material and heat accumulator.

In document US-A-1449517, a stick of hot-melt material is manually pushed with a thumb wheel into an intermediate nozzle heating of conical section reducing towards the outlet. This nozzle heater is also made of solid metallic material, so is long to heat and high thermal inertia.

The document FR-A-914405 describes an electrical distributor for making wax seals. In this embodiment, there is an intermediate neck of distribution downstream and relatively distant from the heating means arranged at the outlet of the reservoir containing the stick.

However, the heating means of the distributors for sticks described previously generally have a significant thermal inertia, while the rods have a low thermal conductivity. The use of this type of distributor is then delicate because, when the heating means are stopped, the intermediate duct and / or nozzle does not cool instantly causing the wax to continue to melt and flow out of the tank for a few moments. This additional wax then sticks against the walls nozzle and other adjacent intermediate walls. This makes the difficult subsequent starts because you have to wait until not only the heating nozzle has returned to its working temperature, but also that any the downstream wax present in the distribution part is also melted to restart, at the risk that the whole stick will soften and make the distributor unusable by a complete glaze.

Above all, in these distributors described above, the wax is heated to its periphery, that is to say on a surface substantially parallel to the axis of displacement of the wax. Also, the heat has great difficulty in reaching the core of the block or stick, given its low thermal conductivity. This leads to local overheating of the wax to accelerate the transfer of heat, thus aggravating the inertial effects of the heating element, and taking risks on the final application temperature.

Document DE 1 954 812 also describes sealant dispensers comprising a main peripheral heating disposed at the outlet of the reservoir giving in a conical intermediate volume terminating itself by a distribution tip. In the variants of Figures 4 and 5, it additional heating is provided, consisting of four electrical resistors arranged in the outlet of the tank in the form a transverse cross, therefore located upstream of the intermediate volume conical. However, the core of the putty quadrants thus cut longitudinally in the stick are still fairly solid when reach the conical intermediate volume where an equalization of the merger must then take place. In addition, when the heating is switched off, the entire surrounding area of sealant solidifies in a single block, so is still long to melt when restarting despite this additional heating cross cruciform.

Document US 2,272,780 describes a distributor of fusible colored material for decorating textiles, this dispenser comprising heating means consisting of a radiator mounted on electrical resistors in the middle of a intermediate chamber located at the outlet of a reservoir, this chamber giving on a ball valve. According to the figures, this radiator is presented in the form of a transverse disc surmounted downstream by four fins arranged in a cross, the molten material having to bypass the disc to reach the valve. This radiator is massive and, when the means of heating, the material solidifies throughout the chamber, which delays again its subsequent startup.

A second type of so-called "roller" dispensers allowing spreading of a stripe wax layer on an application surface is described in documents FR-A-2520601, FR 2 706 261, EP 499 317 or US 3 103 689. These dispensers include a transfer and application roller arranged across the exit from an intermediate zone located in the extension of the outlet of the tank, the gap of this intermediate zone with the roller constituting the distribution surface of the wax ply on the periphery of this transfer roller.

In the variant according to document FR 2 520 601, the distributor is previously installed in a heating sleeve within a box of support all the time necessary for all of the wax contained in the tank melts. The waiting time is particularly long.

In the variant of document FR 2 706 261, the tank made of aluminum includes a central diffusion fin, and is heated by a resistance electric against one of its longitudinal walls. It suits also, in this case, wait until all of the wax contained in the tank is melted before you can use this dispenser.

In the variants of documents EP 499 317 and US 3,103,689, a unique electrical resistance is arranged in the intermediate area just above and parallel to the roller. If desired, the resistance is supplemented by a fin oriented towards the roller to also heat it. The start can only start when all the wax present in the area intermediate is melted.

In summary, hair removal cannot generally begin in these configurations only when all of the wax is present in the tank and / or in the intermediate zone at the outlet from which the roll is located, has melted and comes into contact with the transfer surface of the applicator roller, which requires waiting a considerable time after starting up. This time waiting is detrimental because it prohibits rapid hair removal when the user is in a hurry.

Conversely, when the user has finished hair removal and switches off the heating means, the remainder of molten wax continues to advance certain time to accumulate between these heating means and the roller where it solidifies. This plugging phenomenon of the outlet / distribution gap then results in the possible rotation blocking of the applicator roller. When the next time the dispenser is started, this part of the wax will more time to melt, not being in direct contact with the means of heated.

Furthermore, the thickness of the wax strip is poorly controllable by the user, because it is related to the geometry and the composition of the wax.

The object of the present invention is to provide a hand-held material dispenser hot-melt, in particular depilatory wax, allowing, when it is started, an almost instantaneous merger and distribution of a first quantity of wax to be applied, which wax is stored in the tank in large granules or in the form of bread or solid block.

This distributor must also prevent the wax from melting when it is stopped. residual coming to solidify thereafter in the form of nearby residues of its distribution outlet, and this in order to facilitate the subsequent restart.

If possible, the distributor must also make it possible to control or even adjust to a predetermined value, the thickness of the strip applied.

The structure of this distributor should however be kept as simple as possible to ensure reliable operation over time, and to maintain production and installation costs at a reasonable level.

These goals are achieved in a hand-held dispenser of hot-melt material, in particular depilatory wax, comprising a casing forming a means of manual gripping inside which a reservoir or a housing, of solid hot-melt material in granules or in the form of a bread. This distributor is supplemented with means to advance the material hot melt to an outlet surface of this tank. This distributor also includes means for heating this hot-melt material. More particularly according to the invention, these heating means, having a low thermal inertia, are arranged in a substantially homogeneous manner in an entire area located in correspondence with, or near parallel downstream of, the outlet surface of the tank from which it takes up the dimensions, these heating means constituting the means of distributing the melted wax in a sheet on an application surface or a movable surface of transfer.

By "homogeneous arrangement" in a plane is meant an arrangement by which the heating means are substantially identical per unit area to deliver almost constant heating at each point in the plan. By element having a low thermal inertia is meant a element unlikely to store calories, and can therefore cool very quickly after the heating stops.

So, the whole front part of the block or bread of material is found directly in contact with the heating means, and this front part melts simultaneously over its entire section, to be immediately distributed in tablecloth as it melts during the implementation of the dispenser.

Preferably, the transverse surface of the tank, or of the housing, is constant throughout its depth, and the outlet and distribution surfaces are identical to this cross-sectional area. The advance of wax towards heating means can then be carried out mechanically so constant throughout the section, and also as it melts uniform in the front section.

Advantageously, the heating means have good thermal conductivity, for example having a coefficient (λ) greater than 10 W m ^-1 K ^-1 . Thus, the front part of the block or wax bar in contact with the heating means melts very quickly and the heating means do not heat up very significantly above the melting temperature of the wax, which makes it possible to free from restarting problems, in particular waiting time, mentioned.

According to a first embodiment, the heating means are arranged substantially homogeneously throughout the outlet surface of the reservoir, and include passages for hot melt material only in the molten state, the external face of these heating means constituting the distribution surface of the melted wax in a sheet on a application surface or transfer surface.

The block or the bread of material being pressed against the heating means, this melted part then flows quickly through the passages of the means to be immediately distributed according to a plan. The distributor can be used in all positions thanks to the pressure means of the tank.

Preferably then, the heating means are a grid formed of wires electric heating resistors arranged throughout the outlet surface of the tank.

The heating means then boil down to a simple heating resistance rectangular, not very thick and therefore not thermally inert, and materializing simultaneously the outlet of the tank and the distributor. This low inertia In particular, thermal prevents the formation of heap of melted material, then resolidified. In addition, this resistance is easy to achieve, and the heat dissipated by it is easily controllable depending the intensity of the current flowing through it, which fixes the wax flow rate.

According to a first variant, the outlet surface of the dispenser is rectangular, and the rectangular heating grid consists of a mesh of electric wires supplied with current by two electrodes extending each over the entire length or over the entire height of the grid. By mesh, we mean a network structure or a loose weaving made of threads resistive metal. The length of the rectangle of this grid then corresponds to the width of the spread sheet. The mesh grid may include slots alternatives so as to create a sinusoidal current flow.

According to a second variant, the grid consists of a series of filaments close parallels arranged side by side between two extending electrodes each over the entire length or over the entire height of the grid, therefore dispenser outlet surface.

According to a third variant, the grid consists of a single resistive wire sinusoidal passing alternately from one longitudinal edge to the other.

According to a fourth variant, the grid consists of several bars flat metals electrically connected together and whose width is arranged substantially normally on the grid surface.

According to a fifth variant, the outlet orifice is circular and the means for heaters consist of a single resistive wire arranged in a tight spiral.

This range of achievements allows heating optimization over the entire surface of the bread or block of material in contact with the heating means in function of the thermal parameters of different waxes and other products hot melt.

According to a first embodiment, the advancement means can then include a piston, the head section of which is equal or slightly less than the section of the tank, and which is advanced towards the outlet of the distributor either under the action of thrust means, such as springs, bearing on the one hand against the internal face of the piston head and on the other part against the upstream end of the housing; either through the means of traction, such as a spiral spring whose barrel-casing is integral with the housing close to the outlet of the tank, and whose elastically movable end is attached to the piston. Thanks to this arrangement, the entire block or bread material can be consumed without leaving residue stuck to the walls of the tank. Usefully, the force of the pushing or pulling means can be adjustable, which represents a small possibility of adjusting the flow rate but especially the temperature of the melted wax.

According to a second embodiment, the advancement means can include a basic branch with a frame at its front end containing a transverse heating grid and, if desired, an underlying roller close to the grid, and the rear end of which is hinged at the end rear of a pressure branch, the front end of which bears on the edge upper part of a wax bar, the lower edge of which rests against the grid, a spring installed between the base and pressure legs holding them spread at rest.

Usefully, the pressure branch is surmounted by a support branch articulated at the hinge, a spring installed between these two branches the now set aside at rest, the pressure branch comprising a switch for controlling the power supply to the heating grid to be tilted by the supporting branch approaching the branch of pressure.

This embodiment is close to the proven kinematics of a stapler, that is to say a handle gripped by hand to be compressed so to obtain the desired effect, in this case the distribution of wax in a layer over a transfer and application roller. The dispenser in the form of a handle proves to be particularly easy to use for a beginner user. If the presence of the roller is not essential, it is however preferred for the ease of obtaining a homogeneous strip.

Alternatively, the base and pressure legs are articulated in a notch at the bottom of a handle housing, a cross member pivotally connected to a part in the middle of the pressure branch and on the other hand to a pivot of the branch base being capable of being lowered by an internal vertical bar of the casing, a spacer spring which can be arranged between the base branch and crosses it.

According to a first embodiment, the outlet of the dispenser comprises means for maintaining a gap, such as legs, skids or rollers side, that is to say arranged along the height of the grid, to maintain the external face of the grid at a predetermined distance from the surface of application. This device facilitates the spreading of a thick strip constant determined by the combination of heating power dispensed speed of movement of the dispenser. If desired, the means of gap maintenance are adjustable vertically. The thickness of the strip to be spread is then presettable in combination with the adaptation of the power of heating and / or travel speed.

In addition, the means for maintaining a gap may include a roller of small diameter parallel to the length of the grid (i.e. perpendicular in the direction of movement of the dispenser) disposed near the front face from the distributor. This roller also helps maintain the gap at a desired value. When moving the dispenser. the friction caused on the skin by the roller is less than that generated by pads, hence a better user comfort.

According to a second embodiment, the outlet of the dispenser comprises mobile means of transfer and application arranged nearby opposite of the heating grid constituting the outlet surface of the distributor, these mobile means transporting the wax delivered in a sheet towards the surface of application, for example the skin of the user, for deposit. These means of transfer can be an endless belt rotating between two pulleys fixed, mobile in rotation, to the housing on either side of the surface of distribution. Preferably these means are made in the form of a roll transfer and application arranged close to the distribution surface, and whose length corresponds substantially to that of the distribution surface materialized by the grid.

According to a first embodiment, the diameter of the roller corresponds to the height of the distribution surface. So the grid is preferably frustoconical or in the form of a cylinder to stay close to the roller.

According to a second embodiment, the diameter of the roller is substantially greater than the height of the distribution surface, making the cross-section of the roller opposite the grid is almost flat.

According to a second principle of embodiment, the heating means are arranged substantially homogeneously in, or close behind, a fixed section a movable transfer surface, this section being located directly opposite of the entire outlet surface of the tank and constituting the surface of web distribution, the transfer surface then bringing the web on a application surface.

Preferably, the heating means are constituted by the section of the periphery of a rotary transfer roller located opposite the surface of tank outlet.

So the melting of the only front part of the wax bread is also obtained almost instantaneously by its contact with the roller itself heating locally and directly at the tank outlet. Now this roller periphery ensures even distribution of the wax fondue in tablecloth, letting the next slice of the wax bread come continuously against the heating means. Again, this heating can be carried out from uniformly throughout the front cross section of the bread, which allows to consume the bread gradually slice by slice.

According to a first variant, the heating means comprise a series parallel resistive electrical conductors arranged on the periphery of the roll side by side with regular spacing, their ends being turned against the periphery of the roller flanges, as well as a pair of sliding contacts arranged opposite the conductor returns, the length of these contacts corresponding substantially to the thickness of the reservoir and the wax bread.

According to a second variant, the electrical conductors consist of longitudinal strips cut from a metal coating on the cylindrical periphery of the roller and circular periphery of the flanges. Preferably, this coating is a Nickel-Chrome alloy, the returns being, if desired, coppery. This embodiment makes it possible to effectively control the homogeneity of the resistivity of the strips and to easily manufacture these rolls in large quantities at a reasonable price.

According to a third variant, the heating conductive strips are connected in series by their return. This connection mode provides heating for power in relation to the wax bar, as well as a maintenance heater in the transfer and application part of the roller.

According to a fourth variant, the heating means comprise a induction loop penetrating through an open face inside a roller metallic held in rotation on its other face, this loop being arranged just behind the roller area opposite the tank outlet.

According to an embodiment of the dispenser adapted to this second principle of realization, its case is composed of a basic body containing a tank open at its lower end, as well as two lateral extensions bearing the roller directly under the tank, as well as an upper handle sliding over the upper part of the body, this handle comprising internal support ribs of the wax bar installed in the tank towards the low against the roller, the body and the handle being at rest separated by means of recall.

Preferably, the hand-held distributor of hot-melt material according to the invention comprises means for regulating the electric power delivered to the heating means, which makes it possible to adjust the flow rate proportionally melted wax.

Advantageously, the roller is connected to a displacement sensor (d) connected to an electronic circuit.

For example, the roller is completed by a magnetic disc having several pairs of poles at its periphery, for example four; a detector, for example a switch with flexible blades, is fixed to the body of the distributor facing the periphery of the disc.

Preferably then, the heating means are supplied by current pulses of predetermined duration, voltage and intensity, corresponding to a predetermined energy which can be adjustable, the number of applied pulses being proportional to the rotation of the roller.

So, as soon as the distributor includes a roller, either transfer and application, a small roller belonging to the crew of the means of maintaining the gap, one can very simply achieve a servo of the average heating power, therefore the amount of melted wax, depending the speed of movement of the dispenser, thus elegantly ensuring the distribution of a strip of wax of constant thickness.

Advantageously, the distribution roller or spacing means is rotated by a motor. The distributor's lead over the skin is thus facilitated and more regular, ensuring that the thickness of the strip remains well constant. So, depending on the desired wax thickness and the energy of heating available, the desired speed of the distributor is predetermined for control the roller drive motor.

• la figure 1 est une vue en coupe longitudinale d'un premier principe de réalisation de base du distributeur à main selon l'invention,
• la figure 2 est une vue de la sortie du distributeur de la figure 1 comprenant une seconde variante de grille chauffante,
• les figures 3a et 3b illustrent un mode de fabrication d'une troisième variante de grille chauffante prévue dans le distributeur de la figure 1,
• la figure 4 illustre en perspective sous-jacente un second mode de réalisation du distributeur.
• la figure 5 illustre en perspective vue du dessus d'un troisième mode de réalisation du distributeur.
• les figures 6a et 6b illustrent en coupe, respectivement longitudinale et transversale, un quatrième mode de réalisation du distributeur,
• la figure 7 illustre en coupe longitudinale un cinquième mode de réalisation du distributeur,
• les figures 8a et 8b illustrent en coupe longitudinales, respectivement de devant et de coté, d'un second principe de réalisation de base de l'invention,
• la figure 9 illustre une variante des moyens de chauffe utilisée dans le distributeur selon les figures 8,
• les figures 10a et 10b illustrent en coupe, respectivement transversale et longitudinale, un rouleau pour un distributeur selon un second mode de réalisation du second principe,
• les figures 11a et 11b illustrent un premier mode de réalisation d'une quatrième variante de grille chauffante prévue dans le distributeur de la figure 1, respectivement selon une vue en coupe latérale et selon une vue de face,
• les figures 12a et 12b illustrent un second mode de réalisation d'une quatrième variante de grille chauffante prévue dans le distributeur de la figure 1.

The invention will be better understood from the study of embodiments taken without any limitation being implied and illustrated in the appended figures in which:

• FIG. 1 is a view in longitudinal section of a first basic embodiment of the hand dispenser according to the invention,
• FIG. 2 is a view of the outlet of the dispenser of FIG. 1 comprising a second variant of the heating grid,
• FIGS. 3a and 3b illustrate a method of manufacturing a third variant of a heating grid provided in the dispenser of FIG. 1,
• Figure 4 illustrates in underlying perspective a second embodiment of the dispenser.
• Figure 5 illustrates in perspective top view of a third embodiment of the dispenser.
• FIGS. 6a and 6b illustrate in section, longitudinal and transverse respectively, a fourth embodiment of the dispenser,
• FIG. 7 illustrates in longitudinal section a fifth embodiment of the dispenser,
• FIGS. 8a and 8b illustrate in longitudinal section, respectively from the front and from the side, of a second basic embodiment principle of the invention,
• FIG. 9 illustrates a variant of the heating means used in the dispenser according to FIGS. 8,
• FIGS. 10a and 10b illustrate, in cross section and in longitudinal section, respectively, a roller for a dispenser according to a second embodiment of the second principle,
• FIGS. 11a and 11b illustrate a first embodiment of a fourth variant of a heating grate provided in the dispenser of FIG. 1, respectively in a side section view and in a front view,
• FIGS. 12a and 12b illustrate a second embodiment of a fourth variant of a heating grate provided in the dispenser of FIG. 1.

In the following description, "downstream" means the side of the distributor or of its constituent elements closest to the dispensing orifice, and by "upstream" the opposite side. "Internal face" will also be understood to mean the face of elements of the distributor facing inwards, and by "external face" the face of these same elements facing outward.

The hand dispenser illustrated in Figure 1, designed to dispense material hot-melt such as depilatory wax, includes a case 1 of shape substantially parallelepipedal serving as a gripping means manual. One of the end faces of this case is completely open for constitute a large distribution orifice. Inside this sliding case longitudinally a piston 2 whose cross section of the head is equal or slightly lower than the internal section of the housing. The piston is moved under the action of pressure means 3, such as one or more springs, taking support on the one hand against the internal face of the head of the piston 2, and on the other hand against the upstream end of the housing.

According to a first embodiment, a heating grid 4 is arranged across the open downstream face of the housing 1 and covers its entire section. The edges of this grid are folded over the edges downstream of the walls side of the case, and are held there by a ring 5.

The space between the downstream face of the piston 2 and the internal face of the grid 4 constitutes a reservoir intended to receive the wax 11, either in granules or in the form of bread advantageously coated with a lubricant such as paraffin. Under this last form, the section of the wax bar corresponds substantially to the section internal of the housing 1. The wax is introduced into the reservoir through an opening 10 formed in one of the side walls of the housing 1. The granules or the bread of wax are therefore pushed against the internal face of the grid 4 under the action of the piston 2.

A thick grid can consist of a corrugated metal strip which, in being placed on its edge, is folded on itself in a spiral and following possibly the outline of a rectangle. The length of the rectangle of this grid then corresponds to the width of the strip used, while the height of this rectangular grid corresponds to the thickness of the wax bar contained in The reservoir. The external face of this grid therefore constitutes the exit surface from the distributor.

According to a first preferred variant illustrated in this FIG. 1, this grid 4 is made of expanded metal, such as stainless steel or titanium thin, of the order of 0.1 to 0.2 mm, and its structure is of the tight meshes, each mesh defining a passage of the melted wax. As indicative, the meshes are square, their sides measuring approximately 1.5 mm. When the wax is in the form of granules, their section is then significantly greater than the mesh section of the grid.

As illustrated in Figure 1, such a grid constitutes a resistance electric rectangular serving as a means of heating the wax. This resistor is supplied with electric current by terminals, or electrodes, 6 and 7 arranged opposite and either over the entire length or over the entire height of the grid. A command 9 acting on a switch or a relay not represented controls the passage or not of the current in the grid.

Alternatively, and in order to increase the electrical resistance, the grid 4 can be punched by vertical slots 8, as illustrated in FIG. 2. These slots are very narrow, on the order of 1 mm, and have the effect of reducing the cross section of current flow and increase the length of the path of the electric current, which thus follows a sinusoidal path between the terminals 6 and 7. A current of reasonable intensity, of the order of a few amps, can therefore be used while remaining supplied between terminals 6 and 7 by a very low safety voltage.

Alternatively, this increase in current flow can be simply obtained by means of a successively curved flexible resistive wire, for example like a sinusoid.

Alternatively, the grid can also be made of cut metal, as illustrated in Figures 3a and 3b. To this end, we cut from a sheet or plate metallic 21 rectangular a series of openings 22 side by side in not leaving, between each opening, more than a thin strip of metal, or strand, 24. In addition, all the even openings are longitudinally offset by compared to odd openings with an identical gap. Plate 21 is then overmolded on a rectangular outline 25 with two edges longitudinal slightly cover all the ends of the openings located inside the series, the other openings projecting alternately one then the other longitudinal edge of the contour. After this overmolding, the plate is again cut along the two longitudinal edges of the outline to leave only the grid 28 made up of strands 24 electrically connected in series alternately at the top and bottom, this grid being completed by two side electrodes 26 and 27.

In a variant illustrated in FIGS. 11a, 11b and 12b, the grid 4 can consist of several flat metal bars 200, advantageously parallel, electrically connected to each other and the width of which is disposed substantially normally on the surface of said grid. This arrangement facilitates the flow of the wax through the grid 4, the section of the bars 200 between which the wax flows being small. The contact time with the grid 4 of the wax passing through the grid is long, which prevents the wax from overheating. The quantity of directly heated depilatory wax is significant, which allows an almost instantaneous fusion. The uniformity of the temperatures is thus very satisfactory for the application of the wax. According to the example shown in Figures 11a and 11b the grid 4 is formed by a heating tape 201 arranged in a zigzag between two insulating frames 202 and 203, thus defining a series of parallel bars 200, the two ends of the tape 201 forming electrodes 204 and 205. According to the example shown in FIG. 12b, the grid 4 is formed by a sheet 206 cut in a zigzag as shown in FIG. 12a and folded in accordion fashion so as to define a series of parallel bars 200. The two ends of the cut sheet 206 forms two electrodes 207 and 208. The sheet 206 can be inserted into an insulating frame, not shown in the figures, for example by overmolding. Advantageously, the grid 4 is made up of bars 2 mm wide and 0.2 mm thick. With 8 bars 200 of 40 mm long spaced 1 mm such a grid must allow to melt 0.55 g / s of wax in the form of a loaf of rectangular section 40 × 10 mm ² with a power of order of 55 W.

As a variant illustrated in FIG. 5, the grid 44 can also be produced under the form of a series of parallel resistors between two electrodes of longitudinal distribution. This grid is also made of metal in cutting in a sheet of metal a series of side-by-side openings leaving no they more than a thin strip of metal, or strand. The two end openings are L-shaped so as to electrically separate each of the side electrodes and to provide a connection tab for the wires power supply 39.

In either embodiment, the current source supplying the grid is a step-down transformer, possibly with several ratios, monitoring an electronic switching power supply allowing adjustments, or all other power supply device with rheostat allowing to adjust the electrical power delivered to the grid 4. Preferably, the current source is housed in a power supply unit connected by an electric cable to the distributor, but it can also be integrated into the housing 1, in the manner of irons instant welds.

It should be noted that the grids described are thin or made from thin strips and that, their constituent material having good thermal conductivity, they also have low thermal inertia. By material of good thermal conductivity is meant a material by which heat can be transmitted quickly from one point to another; for example, the majority of metals having a coefficient of thermal conductivity λ greater than 10 W m ^-1 K ^-1 . By low thermal inertia is meant a material which is not very capable of accumulating heat, for example having a mass thermal capacity C _{p of} less than 0.4 kJ / (kg.K). Thus, these grids store practically no calories.

The hand dispenser of figure 1 is used and works in the same way next.

The wax 11 is introduced into the dispenser through the opening 10, after having previously retracted the piston 2 against the action of the spring 3 by a command manual not shown. The piston 2 is then released which, under the action of the spring, pushes the solid wax 11 against the internal face of the grid 4.

By acting on control 9, the electrical circuit supplying the heating means for passing a sufficiently strong electric current in the grid 4 so that it heats up almost instantaneously. This heat immediately transmits to contact wax due to good conductivity grid thermal. As soon as this portion of wax reaches its temperature of melting, it flows quickly through the grid passages then out of the external face of this grid constituting the dispenser outlet orifice. During this flow, the temperature of the grid does not exceed the temperature of wax melting only a few degrees. The spring 3 and the piston 2 pushing the back of the wax bar 11 force the flow of the transverse portion of melted wax and therefore bring the next transverse portion still solid in contact with the internal face of the grid 4 for heating then fusion until also achieve a regularly fluid state. Distribution of melted wax is therefore carried out continuously. Above all, the heat exchange remains very located in contact with this grid, which avoids melting all of the bread wax, as in previous distributors.

The user moves the dispenser transversely over her skin while bringing the grid almost in contact with the area to be treated. This operation, which causes spreading the fluid wax in the form of a strip, is without risk of burning the made of the small thickness of the spread band.

As soon as the current supply in the grid 4 is cut off by acting in consequence on command 9, the electric power delivered to the grid is canceled and the wax flow stops almost instantaneously. Indeed, the low thermal inertia of the grid causes it to cool immediately cut off the power supply, which avoids unnecessarily melting the portion of adjacent wax still solid. In addition, the grid has been adapted in such a way so that no part of the case that could be a thermal reservoir either heated.

In operating mode, the user can control the thickness of the strip by acting either on the speed of movement of the distributor, or on the power electric supplied to grid 4 when the distributor ends with the grid heating.

• W étant la puissance électrique délivrée à la grille,
• p étant la masse volumique de la cire,
• Qv étant le débit volumique de la cire,
• C_p équivalent = C_p + Lf/ΔT, C_p étant la chaleur massique de la cire. Dans ce terme et pour simplifier, on ajoute la chaleur de fusion Lf répartie sur l'échelle de température de l'ambiance à la température de fusion, soit Lf/ΔT,
• ΔT étant l'écart de température entre la température ambiante et la température de cire fondue.

In fact, all the heat developed electrically in the grid is transferred only to the portion of the wax bar in contact, the conductivity of which is inherently low. The molten wax flows quickly out of the grid under the action of pressure, the grid is always in contact with solid wax, and the temperatures of the wax and the grid only very slightly exceed the temperature of wax melting. The heat losses are very limited because the heat transfer remains very localized. Thus, the wax flow rate is directly proportional to the electric power delivered to the grid, by answering the equation: W = p Qv C p equivalent ΔT

• W being the electric power delivered to the grid,
• p being the density of the wax,
• Qv being the volume flow rate of the wax,
• C _p equivalent = C _p + Lf / ΔT, C _p being the specific heat of the wax. In this term and for simplicity, the heat of fusion Lf distributed over the temperature scale of the environment is added to the fusion temperature, ie Lf / ΔT,
• ΔT being the temperature difference between the ambient temperature and the temperature of molten wax.

The melting not being straightforward, this temperature of molten wax depends, for a given wax, the speed of flow through the grid 4. More the slower the flow, the higher the temperature of the molten wax.

Thus, by acting on the electric power delivered to the grid 4, for example through a rheostat, the user can, for the same speed of displacement of the dispenser on the skin, apply strips more or less thick.

• L étant la longueur de la grille,
• e étant l'épaisseur du film de cire produit sur la peau lors du déplacement du distributeur (grille très proche de la peau),
• V étant la vitesse de déplacement du distributeur sur la peau, vitesse mesurée par sa composante perpendiculaire à la largeur du distributeur.

Conversely, when the electrical power is established at a predetermined value, and all other things being constant, the wax flow rate Qv is also constant as soon as the user switches on the dispenser. This flow is the product: Qv = The V

• L being the length of the grid,
• e being the thickness of the film of wax produced on the skin when the dispenser moves (grid very close to the skin),
• V being the speed of movement of the distributor on the skin, speed measured by its component perpendicular to the width of the distributor.

Thus, if the user moves the dispenser at high speed, it induces production of a thin film; if on the contrary it advances the distributor slowly, the film produced is thick. It therefore easily controls the thickness of band and can make thick bands, possibly useful for hair removal armpits.

It should also be noted that the thrust exerted on the wax bread is of the order of much larger than the forces of gravity, which means that the distributor can be used in all positions. It is also possible to endow the distributor of a device for adjusting the strength of the means of pressure, which is a complementary way to control flow of molten wax and assure it an acceptable temperature at electrical power delivered to the gate and constant speed of movement.

According to a second embodiment illustrated in FIG. 4, there are on both sides of the lateral sides of the distributor grid two pads 35 allowing to maintain this grid, constituting the outlet surface of the applicator, at a predetermined distance from the application surface, in the skin of the user. These skates help establish value constant the thickness of the deposited layer. In addition, these skates can be mounted on the side faces of the housing by pawls height adjustment.

More particularly, a recess 15 is produced on each side of the housing 1 at the outlet surface of the dispenser. In this a mobile unit 20 composed of two skids is installed side 35 supporting a small transverse roller 30.

This small roller 30 is arranged so that its lower line substantially coincides with the lower edges of the pads fixing the spacing between the outlet surface of the dispenser and the skin. This roller 30, which takes place in front of this crew in the direction of movement of the distributor on the skin, either at the front of the grid 4, generates, by its rotation during its displacement on the skin, less friction than that induced by a pad transverse. Alternatively, the skates are made up of a series of rollers aligned. In this case, the transverse roller 30 is no longer really necessary.

In use mode, and depending on the vertical position of the crew 20, the thickness of the wax strip will be greater or less in relation to a given electrical power and traveling speed.

According to a third embodiment illustrated in Figure 5, the housing 41 is flattened parallelepiped with an open front face in which is installed a heating grid 44 supplied by supply wires 39. The most of the internal space of the housing constitutes a tank 45 to inside which slides a piston 42. This reservoir is accessible by a side door 47 for insertion of a wax plate.

More particularly in this embodiment, the piston 42 is pulled out front, that is to say towards the grid 44, by the end of a spiral spring 43 movable against the upper internal face of the case, exiting outside by a slot to reach its barrel-casing 46 fixed on the external face to proximity to the front face. Piston fingers 48 passing through slots longitudinal 49 allow the piston to be pulled back against the spring 43 when necessary. Alternatively, we can consider a tension spring mounted on a support rod arranged along one of the side walls of the housing, this wall having a slot for a finger for hooking the piston spring. These arrangements make it possible to reduce the total length of the distributor in comparison with the embodiment of FIG. 1.

A start of run switch 52 is installed at the bottom of the housing 41 to the rear of the piston 42 by which it is actuated. This switch prohibits heating the grid when the piston is held back, especially when loading a brochure. A second limit switch 53 is arranged under the housing near the grid. A stopper 55 secured to the piston and passing through the housing through a lower longitudinal slot 54 actuates this switch when the entire wax wafer is consumed and this piston itself comes into contact with the grid.

This dispenser can be used as such, or in combination with a application roller 60 mounted in a hollow cover 62 nestable in the front end of the housing 41. This cover can either be permanently fixed to the case, either be removable. When the cover is mounted, the grid 44 is found a short distance from the roller. Thanks to the thermal characteristics and when the heating grid 44 is arranged, the wax freezes only at this level when the power supply is cut off. This small portion of wax is almost instantly recast when restarted. Furthermore, the gap between the roller 62 and the cover edge 64 defines a calender for regulating the thickness of wax deposited.

According to a fourth embodiment illustrated in FIG. 6, the dispenser is present in the form of a compressible handle 70 similar to that used for a stapler. A base branch 72 carries at its end before a transfer and application roller 85 whose axis 86 is held in one hand and the other by two lateral supports 82. This end of the base branch also carries a frame 92 containing a transverse heating grid 94. At its other rear end, this basic branch is articulated by a hinge 75 to a pressure branch 74 located inside a branch of enveloping support 76 also articulated on the hinge. The branch of pressure 74 follows the movements of the support branch 76 in bending near a spring 71.

The pressure branch carries a switch 80 actuated by a prominence of the support branch when the latter lowers by compressing the spring 71. The front end of the pressure branch 74 comes to rest on the edge upper part of a wax bar 91, the lower edge of which rests in the frame 92 against the grid 94. Preferably, the wax bread is sold by being provided with a dovetail tenon 13 along its upper edge, this tenon being slid into a groove arranged in correspondence in the end of the support branch 74. This connection keeps the bread in the distributor housing formed by the space between the ends of the base and support branches, and incidentally allows the bread to be lifted out of the gate 94 under the impulse of the branch spacing spring 73.

A stop 77 mounted on the base branch 72 and passing through the branch pressure 74 through an orifice 78 makes it possible to limit the descent of the branch support 76 when its front end is close to frame 92.

As best seen in FIG. 6b, the roller 85 turns freely thanks to ball bearings around a fixed tubular axis 86 mounted cantilevered. In this axis is embedded an additional heating resistor 96, preferably temperature-regulated, to keep the roller at a fair temperature sufficient to keep the transferred wax strip soft. In addition, the roller 85 is extended by an axis 87 supporting a magnetic disc 100 having several pairs of poles at its periphery, for example four pairs. A detector 102, for example a flexible reed switch, is attached on the corresponding support 82 of the dispenser, and this near the disc 100. This switch closes when a pole passes near it, which allows to observe the rotation of the disc, therefore of the roller.

Preferably, the gate 94 is supplied with pulses of electrical energy of predetermined duration, voltage and intensity to avoid too much fusion wax quickly on site, the amount of energy then being proportional to the number of pulses delivered per unit of time. When the distributor, we apply a first quantity of energy determined in advance to start melting the bottom part of the wax bar. The amount of applied energy is then proportional to the rotation of the roller such as detected by sensor 102. The pulses are all the closer the roller turns quickly. If the roller stops, the heating stops also.

The user begins by spreading the pressure and support branches 74, 76 of the base branch 72, helped in this by the spring 73, to install a loaf of wax by inserting the pin 13 into the corresponding groove at the end of pressure branch 74. It closes the distributor, then grabs it tightening with one hand the branches 72 and 76 which approach by pivoting around of axis 75.

When the bread 91 comes into contact with the grid 94, the pressure branch 74 on the other hand stops, the supporting branch 76 continuing to lower against from the spring 71 until the switch 80 trips. The support on the bread is then, somehow controlled by spring 71. Closing the switch 80 authorizes the passage of electric current through the gate 94, with a first energy pulse to initiate the melting of the wax, regulated by automatically thereafter according to the rotation of the roller. The part front of the melting wax bread, it then crosses the grid to moisten the roller which, turning on the skin, deposits a strip of wax on it.

When the bread 91 is consumed, the support branch 76 comes into contact against the stopper 77. The spring 71 relaxes while continuing to lower the branch of pressure 74 until it is also retained by a stop 83 of the support branch. Switch 80, then released, cuts off the power supply of the heating grid. When the distributor is released, the spring 73 tends to spread the base and pressure branches, the remaining heel of the wax bar is taking off and withdrawing from the grid. Then just change bread 91 to repeat the wax strip spreading operation.

FIG. 7 illustrates a fifth embodiment similar to that of the figure 6, except that the kinematics of the branches is somewhat modified to allow better control of the force of support of the bread against the grid. As before, we recognize a basic branch 172 articulated by an axis 175 at its rear end at the bottom of a housing-handle 176 of decoration and support, and carrying at its front end a frame 92 containing a transverse heating grid 94, as well as a transfer roller 85 under jacent to the grid and whose axis 86 is held by two lateral supports 82. A pressure arm 174, the front end of which rests on the edge upper bread 91, is held by its rear end against the face top of a notch 181 located at the branch joint base, this maintenance being ensured by a spring 173 acting between this pressure branch and the basic branch. In the underside of the notch, under the rear end of the pressure branch, is installed a switch 180.

In the middle, the pressure branch 174 is pivotally connected to the end rear of a cross member 178, the front end of which is kept lowered against a pivot 169 of the base branch by a vertical support bar 179 internal of the housing 176. This cross member is subjected to the thrust of the end upper part of a second spring 171, the lower end of which rests on the basic branch. This cross comes to stop against a stop 177.

The user manually grasps the enveloping casing 176 of the dispenser, and this without risking inadvertently triggering the melting of the wax since it does not act more directly on the basic branch. By cons, as soon as she poses the roller 85 on an application surface, and that it impresses a pressure towards the low on the casing, the cross member, supported by the bar 179, descends the branch of press 174 until its rear end presses against the switch 175 that it trips. Electric heating energy passes through only then grid 94. The subsequent descent of the cross member then prints a pivoting movement at the pressure branch around its end rear resting on the switch, the front end pressing on the edge upper bread 91 and descending as it melts.

According to a second principle of embodiment illustrated in the first variant on the Figures 8a, 8b, the dispenser includes a transfer and application roller 101 of the melted wax. roller whose peculiarity is that its peripheral zone directly opposite the tank outlet is the means of homogeneous heating of the entire front cross section of the wax bar 104.

In this embodiment, the housing is composed of two sliding parts, one in the other, namely a base body 103 surmounted and partially covered by a handle 106. Lugs 138 protruding from the upper edge of the body 103 are engaged in grooves 118 in correspondence formed in the internal face of this handle, thus avoiding an undesired separation of these two pieces.

The lateral faces of the body 103 are extended downwards by two hollow extensions 130 holding between them the horizontal axis 102 of a roller 101 freely rotating. Internal ribs of the body define a reservoir internal vertical, open on its underside to lead to the generator top of the roller. This tank contains a rectangular wax bar 104 of thin thickness whose internal edge therefore comes against the area upper roller device. The walls of the tank have a pair of vertical slots in which ribs 105 of the handle 106 making it possible to push this bread against the roller by acting on this handle. In addition, two vertical springs 107 acting between the bottom hollow extensions 130 of the body 103 and the upper internal face of the handle 106 tend to separate these two parts from each other at rest, then releasing the wax bar 104 from the support action of the ribs 105.

More particularly according to this second principle of the invention, the roller 101 is consisting of a hollow cylinder 110 having at each end a crown radial 111 facing inwards. In each crown is engaged a flange 112, in another material, rotating around the axis 102, these flanges thus having a hub function.

The cylindrical body and its crowns are made of a material of low thermal inertia and, according to a first variant, are provided with a series of parallel resistive electrical conductors oriented in the longitudinal direction of the roller, that is to say by following a generator. These conductors are therefore arranged on the periphery of the cylindrical body side by side with a spacing regular, their ends being turned against the crown. Each end conductor is folded in the form of a return on the crown corresponding.

According to a second variant illustrated in Figures 8, the periphery of the roller and the periphery of the crowns are coated externally with a deposit of conductive metal. For example, the roller is made of plastic, such as a polycarbonate, and the deposit is a Nickel-Chrome alloy. This deposit is low thickness, of the order of a few microns, even submicron, to present sufficient electrical resistance. The deposit is regularly split across its thickness along planes containing the axis 102, so as to appear bands of heating resistors 113 isolated from each other. Each band end has a return 114 on the crowns 111 which thus become current collectors. Advantageously, the returns 114 covering the crowns are coppered to be thicker and less resistive. Alternatively, the deposit on one of the crowns is continuous and smooth.

A pair of sliding contacts 108 is arranged in the upper part of the hollow extensions on either side of the roller 101. As best illustrated in FIG. 8a, the length of these contacts corresponds substantially to the thickness of the tank and the wax bar. These contacts 108 come to rub on returns 114 so as to supply only the conductor or strips resistive 113 momentarily in contact with the lower front edge wax bread. This creates an elegant heating surface on the periphery of the rotating mobile roller, and this only in the area located directly opposite the tank outlet.

According to a third variant, all the strips on the periphery of the roller are connected in series by the interconnection of their return as illustrated in the figure 9. Then, two close contacts 108a and 108b mainly supply a few strips 117 defining the heating zone 116 located directly at the outlet of the tank. Due to this serial link, the other bands 119 are also supplied, but by being much more numerous therefore generally more resistive, the electrical power dissipated is lower. This power is actually just necessary for heating maintaining the outer part of the roller at a temperature acceptable to hold the soft wax during transfer.

Typically, the electrical power dissipated by the heating zone 116 on the whole slice of the wax bread is around 70 to 100 Watts, allowing rapid and regular melting. However, the roller is not inert thermally, stopping the heating means causes a very rapid stop the melting of the front part of the wax bar, thus avoiding any subsequent blocking distant part, only a thin film of wax possibly remaining on the roller.

According to a fourth variant of the second principle illustrated in FIGS. 10a and 10b, the roller is constituted by a cylindrical tube 120 closed by a flange, or cheek, 121 secured to an axis 123, this roller therefore turning in door false on an extension 130 of the distributor body. The cylindrical tube is of an electrically conductive material. We fix on the other extension of the body a slender induction loop 126 penetrating through the open face on the inside of the tube and placed just behind the zone 128 of tube opposite the outlet of the reservoir, therefore of the front face of the wax bar 104. So the currents traversing this loop 126 locally induce currents in the tube which heats up in this area 128, and this with a power of the order of 50 to 100 Watts to melt the front section of the wax bar in contact.

According to an improved variant, the rollers 101 of FIGS. 8 and the roll 120 of FIGS. 10 are supplemented by a magnetic disc 125 integral with rotation of their axis, this disc having several pairs of poles at its periphery, for example four. In correspondence, a detector 126, by example a switch with flexible blades, is fixed to the extension of the body opposite from the periphery of the disc. This detector generates a signal every time that a pair of poles passes nearby.

So, in order to control the quantity of wax melted on a sector of the roller, we supplies the resistive heating zone according to figures 8 or inductive according to Figures 10, by energy pulses. Heating voltage and intensity are preferably fixed and the amount of energy delivered per pulse proportional to the duration of the pulse. There are as many pulses as there are up or down signals delivered by the sensor. A pulse delivers the energy required to melt the wax coating a roller sector defined by the physical angular spacing given by the signal generator. The number of these fictitious sectors is equal to the number of pulses that can generate the signal generator in one revolution of the roller.

When the distributor starts, a first quantity of energy is delivered predetermined to initiate the melting of the front of the bread and release the roller. Then the number of pulses per unit of time, so the intensity of the heating is preferably determined in proportion to the roller rotation speed. For example, the detector 126 controls the heating of the roller area via a time delay relay generating energy pulses at each passing signal. The impulses are then closer together the faster the roller turns. If the roller stops, the heating also stops.

It should also be noted that by modifying the characteristic values of the pulses, you can increase or reduce the heating power for a given feed rate, which then results in a voluntary change of the thickness of the spread wax layer.

This limits the disadvantages due to clumsy use of the device which would lead to the melting of the wax loaf on site and the freezing of the appliance. By elsewhere, the active heating element of the roller being far from the skin, the risks of burns in the event of malfunction or improper use are minimal.

Obviously, the roller speed detection devices and the control automatic associated heating power described with reference to Figures 6 and 10 are also applicable to the roller according to Figure 5, and also with the small roll of the gap maintaining crew of figure 4.

We can also consider motorizing the rollers or rollers, which make then office of controlled means of advance of the distributor. This engine may include a gear train going up along a side wall of the case to come to engage in the output pinion of a motor electric rear. So we can also control the rotation speed of the roller (or displacement of the dispenser) depending on the thickness of desired band and electrical power delivered to the grid.

The invention is in no way strictly limited to the exemplary embodiments described above, but includes many modifications or improvements. In particular, it can be envisaged that the outlet surface of the dispenser is no longer rectangular but circular. In this case, the means heaters are cylindrical flattened and include for example a resistive wire arranged in a spiral, the space between each turn representing a passage of the melted wax.

Claims (26)

Hand-held dispenser of hot-melt material, in particular depilatory wax, comprising a housing (1) forming a manual gripping means, the interior of which is provided a reservoir or a material housing solid hot melt (11) in granules or in the form of a bread, this dispenser being supplemented with means (2) for advancing the hot-melt material towards a outlet surface of this tank, as well as means for heating this hot-melt material, characterized in that the heating means (4, 44, 94,116,128), having a low thermal inertia, are arranged so substantially homogeneous throughout an area located in correspondence with (4,44,94), or close parallel downstream (116,128) of, the surface of outlet of the tank whose dimensions it takes up, these heating means constituting the means for distributing the molten wax in a layer over a application surface or a mobile transfer surface. Dispenser according to claim 1, characterized in that the surface transverse of the tank, or of the housing, is constant over its entire depth, and the outlet and distribution surfaces are identical to this transverse surface. Distributor according to claim 1, characterized in that the heating means have good thermal conductivity, for example having a coefficient (λ) greater than 10 W m ^-1 K ^-1 . Dispenser according to one of claims 1 to 3, characterized in that the heating means (4,44,94) are arranged substantially homogeneous throughout the outlet surface of the tank (11), and comprise passages of the hot-melt material only in the molten state, the face external of these heating means constituting the distribution surface of the wax melted in a layer on an application surface or a surface of transfer (60.85). Dispenser according to claim 4, characterized in that the means heating elements are a grid (4,44,94) formed of resistive heating wires electric arranged throughout the outlet surface of the tank. Dispenser according to claim 5, characterized in that the surface of dispenser outlet is rectangular, and the rectangular heating grid (4,44,94) is constituted by a mesh of electric wires supplied with current by two electrodes each extending over the entire length or over the entire height of the grid, this mesh comprising, if desired, alternative slots. Distributor according to claim 5, characterized in that the grid (4,44,94) consists of a series of close parallel filaments arranged side by side between two electrodes each extending over the entire length or over the entire height of the grid, therefore from the outlet surface of the distributor. Distributor according to claim 5, characterized in that the grid (4,44,94) consists of several flat metal bars (200) connected electrically between them and whose width is arranged substantially normally on the surface of said grid. Distributor according to claim 8, characterized in that the grid (4,44,94) is formed by a heating tape (201) arranged in a zigzag between two insulating frames (202) and (203), thus defining a series of parallel bars (200). Distributor according to claim 8, characterized in that the grid (4,44,94) is formed by a sheet (206) cut in a zigzag and folded in accordion so as to define a series of parallel bars (200). Dispenser according to one of Claims 8 to 10, characterized in that the grid consists of 8 bars (200) 40 mm long, 2 mm width and 0.2 mm thick, spaced 1 mm apart. Dispenser according to one of Claims 4 to 11, characterized in that the advancing means comprise a piston (2) whose cross section of the head is equal to or slightly less than the section of the tank, and which is advanced towards the outlet of the distributor is under the action of thrust means (3) taking support on the one hand against the internal face of the piston head (2) and on the other hand against the upstream end of the housing (1), either under the action of traction means such as a spiral spring whose barrel-casing is integral with the housing close to the outlet of the tank, and whose elastically movable end is attached to the piston. Dispenser according to one of Claims 4 to 11, characterized in that the advance means comprise a basic branch (72) carrying in its front end a frame (92) containing a transverse heating grid (94), and, if desired, an underlying roller (85) close to the grid, and the end of which rear is articulated (75) at the rear end of a pressure branch (74) the front end of which bears on the upper edge of a wax bar (91), the lower edge rests against the grid, a spring (73) can be installed between the base and pressure branches keeping them apart at rest. Dispenser according to one of Claims 4 to 13, characterized in that its distribution outlet comprises means for maintaining a gap, such as legs, skids, or rollers arranged along the height of the grid, or a roller of small diameter parallel to the length of the grid, to maintain the external face of the grid (4) at a predetermined distance from the surface of application. Dispenser according to one of claims 4 to 13, characterized in that it comprises mobile transfer and application means arranged at proximity to the heating grid constituting the outlet surface of the dispenser, such as a transfer and application roller (60,85), the length corresponds substantially to that of the distribution surface. Device according to one of claims 1 to 3, characterized in that the heating means are arranged in a substantially homogeneous manner in, or close behind, a fixed section (116,126) of a movable transfer surface (101,120), this section being located directly opposite the entire surface tank outlet and constituting the water distribution surface, the transfer surface then bringing the web onto an application surface. Device according to claim 16, characterized in that the means for heaters consist of the section (116) of the periphery of a roll of transfer (101) located opposite the outlet surface of the tank. Device according to claim 17, characterized in that the means heaters include a series of resistive electrical conductors (113) parallels arranged on the periphery of the roll side by side with a spacing regular, their ends (114) being turned against the periphery of the flanges (111) of the roller, as well as a pair of sliding contacts (108) arranged opposite the conductor returns, the length of these contacts substantially corresponding to the thickness of the reservoir and the wax bar. Device according to claim 18, characterized in that the electrical conductors consist of longitudinal strips (113) cut in a metallic coating on the cylindrical periphery of the roll and circular flanges, if desired, these bands being connected in series by their returns to the periphery of the flanges. Device according to claim 17, characterized in that the means for heaters include an induction loop (126) penetrating from one side open inside a metal roller (120) held in rotation at its other face, this loop being placed just behind the area of the roller opposite from the tank outlet. Device according to one of claims 16 to 20, characterized in that the dispenser housing is composed of a base body (103) containing a open tank at its lower end, as well as two side extensions (130) carrying the roller (101) directly under the tank, as well as a upper handle (106) sliding over the upper part of the body, this handle comprising internal ribs (105) for supporting the wax bar installed (104) in the tank down against the roller, body and handle being at rest separated by return means (107). Dispenser according to one of the preceding claims, characterized in what it includes means for regulating electrical energy. Dispenser according to one of Claims 14 to 21, characterized in that the roller is connected to a displacement sensor (d) connected to a circuit electronic, this sensor can be composed of a magnetic disc (125) integral with the axis of the roller and having several pairs of poles at its periphery ; and a detector (126), for example a reed switch flexible, which is fixed to the distributor body opposite the periphery of the disk. Dispenser according to claim 23, characterized in that the means heaters are powered by pulses of electrical energy of duration, of predetermined voltage and current corresponding to one or more energy (s) predetermined (s) can be adjustable. Dispenser according to one of Claims 14 to 24, characterized in that that an energy pulse is applied to the heating means before the roller rotation. Dispenser according to claim 24, characterized in that the number of applied pulses is proportional to the rotation of the roller as read by the sensor.

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