EP0367684B1 - Method and apparatus for waxing skis - Google Patents

Method and apparatus for waxing skis Download PDF

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Publication number
EP0367684B1
EP0367684B1 EP89420366A EP89420366A EP0367684B1 EP 0367684 B1 EP0367684 B1 EP 0367684B1 EP 89420366 A EP89420366 A EP 89420366A EP 89420366 A EP89420366 A EP 89420366A EP 0367684 B1 EP0367684 B1 EP 0367684B1
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EP
European Patent Office
Prior art keywords
ski
scraper
transverse
sole
shoe
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP89420366A
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German (de)
French (fr)
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EP0367684A2 (en
EP0367684A3 (en
Inventor
Jean-Pierre Bocquet
Daniel Vieau
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Skid
Original Assignee
Skid
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from FR8813137A external-priority patent/FR2636881B1/en
Priority claimed from FR8813998A external-priority patent/FR2637509B1/en
Priority claimed from FR8903264A external-priority patent/FR2643852B2/en
Application filed by Skid filed Critical Skid
Priority to AT89420366T priority Critical patent/ATE72764T1/en
Publication of EP0367684A2 publication Critical patent/EP0367684A2/en
Publication of EP0367684A3 publication Critical patent/EP0367684A3/en
Application granted granted Critical
Publication of EP0367684B1 publication Critical patent/EP0367684B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63C—SKATES; SKIS; ROLLER SKATES; DESIGN OR LAYOUT OF COURTS, RINKS OR THE LIKE
    • A63C11/00—Accessories for skiing or snowboarding
    • A63C11/04—Accessories for skiing or snowboarding for treating skis or snowboards
    • A63C11/08—Apparatus for waxing or dewaxing

Definitions

  • the present invention relates to a method and a device for molding by scanning ski soles made of thermoplastic material.
  • thermoplastic resins as a coating constituting the sole or sliding surface of skis has led to the development of machines for carrying out repair or renovation operations on these ski soles, in order to restore a surface condition free of roughness or cracks and restore the original mechanical characteristics to these coatings.
  • thermoplastic filler material is continuously fed in a solid form.
  • heating body shaped as a display shoe the filler material being gradually softened in the heating body and conveyed in liquid form under the shoe to be crushed and spread on the ski sole during the sweeping or longitudinal translation movement skating on the ski.
  • the device for implementing this process comprises means for supplying thermoplastic filler material, a heating body with a display shoe shaped to receive the filler material in solid form, for heating and softening it gradually, to bring it in liquid form under a distribution and spreading structure intended to be pressed against the ski sole and to be driven in longitudinal translation on said ski sole in a preferential direction of propagation.
  • the skate has a projection for preheating the ski sole upstream of the distribution structure.
  • the material constituting the ski soles is generally a polyethylene.
  • polyethylene in solid form, strip, wire or granule is generally used as thermoplastic filler material.
  • ski soles in very high molecular weight polyethylene.
  • Such ski soles are obtained by sintering, and formed by slicing.
  • the sliding qualities thus obtained are superior to those produced with polyethylene of lower molecular weight, such as polyethylenes hot molded at a temperature above the softening point.
  • the object of the present invention is in particular to produce a molding of the ski sole by sweeping, making it possible to conserve the sliding qualities of the material constituting the original sole as much as possible, while avoiding recharging the flat parts of the soles with thermoplastic material. ski, and by sufficiently recharging the hollow parts of the soles.
  • the difficulty is in particular to sufficiently recharge the hollow parts of the soles, in order to avoid obtaining hollow parts again after removal of the overmolding material on cooling.
  • the present invention also aims to reduce as much as possible the heating time of the very high molecular weight polyethylene forming the initial sole to be molded.
  • the reduction of the heating time implies an increase in the speed of translation of the overmolding device relative to the ski sole, speed which tends to reduce the time required for overmolding and therefore to increase the production rate.
  • a first attempt may consist in increasing the heating power of the resistors housed in the display pad, in order to increase its temperature and to increase the heating rate of the plastic filler material and of the sole to be molded. It turned out, however, that such an attempt leads to failure, because it makes it possible to slightly increase the scanning speed, but the layer of polyethylene deposited acting as thermal mattress still keeps the heat on the ski sole for too long. . A more appreciable increase in the power and the heating temperature leads to the deterioration of the filler material, and the production of fumes, in particular during the downtimes between two overmolding operations.
  • the aims sought by the invention must not lead to a reduction in the quality of the overmolding obtained, or the distribution of the material deposited on the sole.
  • Another object of the invention is to provide a semi-automatic overmolding device, ensuring by itself the relative transfer of the ski and the overmolding device; according to the invention, it is sought to reduce the size of the device, and in particular to design such a device having a size significantly less than the length of the ski. This requires new means ensuring the maintenance of the ski and its transfer at a regular speed in the device.
  • thermoplastic filler material in a molding head, is successively heated in heating channels, introduced into a transverse distribution groove formed on the underside of the skate structure. display, crushed and spread on the ski sole by a display surface, and, at the end of the display area under the display shoe, the thermoplastic filler material still in viscous form is immediately removed under pressure by a transverse scraper.
  • the process of hunting under pressure should not be confused with a simple scraping.
  • the pressure probably causes a slight expulsion of filler material downstream of the scraper through the recesses of the surface to be overmolded, and the filler material relaxes when it passes from the viscous and compressed state to the solid state. This results in an excess thickness of filler polyethylene in the hollow surface areas requiring repair. This effect would not be obtained with a traditional scraping.
  • the transverse scraper consists of a blade brought substantially to the temperature of the display shoe; the scraper is integral with said display shoe.
  • the blade advantageously consists of a substantially straight transverse lower edge separating an anterior face and a posterior face.
  • the transverse scraper can advantageously be held in sliding contact with the lower edges of the ski, the thermoplastic filler material providing sufficient lubrication to promote sliding between the scraper and the ski edges without excessive wear of the scraper and edges.
  • the overmolding head according to the present invention substantially takes up the structure of the devices described in patent FR-A-2 391 054, and further comprises, downstream of the distribution zone, a transverse scraper shaped to scrape the filler material still in liquid form on the ski sole.
  • the transverse scraper is preferably a blade made of heat conducting material and subjected to the action of heating means bringing it to a temperature at least equal to the softening temperature of the filler material.
  • a blade in the form of a steel bar of rectangular section, integral with the display shoe, and thus driven in translation and heated by the display shoe.
  • One of the edges of the steel bar forms the sharp lower edge which protrudes below the distribution and display surface of the shoe.
  • the projecting edge of the scraper protrudes below the distribution and spreading surface of the skate at a height of between two and four tenths of a millimeter.
  • the front face of the scraper forms, with the distribution and spreading surface of the shoe, an angle between one hundred and five and one hundred and thirty five degrees, advantageously one hundred and twenty degrees approximately.
  • the overmolding head is mounted oscillating on a transverse axis fixed to a pressing arm connected to the frame, while the ski support is mobile and driven in longitudinal translation.
  • the ski support comprises a movable and removable straddle comprising a rectilinear beam associated with wedges and with means for holding the ski.
  • the external surface of the rectilinear beam forms a bearing surface, opposite to the surface to be machined of the ski, on which rolls a driving roller with transverse rotation shaft urged by a motor and mounted on the frame. Pressing means produce an appropriate pressure to keep the overmolding head in abutment against the ski.
  • the rotation shaft of the roller is advantageously arranged along the mean vertical transverse plane of the overmolding head.
  • the straddle bearing surface includes notches cooperating with corresponding notches formed on the surface of the driving roller.
  • the overmolding head shown diagrammatically in FIGS. 1 and 2, essentially comprises a heating body, generally referenced 1, made of thermally conductive metal, in which are housed heating cartridges such as cartridges 2 and 3 containing a distribution of electrical resistances.
  • the heating cartridges 2 and 3 are distributed in the heating body to ensure an appropriate distribution of temperature in the heating body.
  • the central part of the heating body during operation, is brought to a temperature between 320 and 340 ° C, advantageously about 330 ° C.
  • the heating body 1 is traversed right through by extrusion conduits such as the conduit 4.
  • extrusion conduits such as the conduit 4.
  • the upper end of the extrusion conduits is shaped to receive the filler material in solid form.
  • the filler material may be in the form of a polyethylene wire, or two polyethylene wires generally referenced 6 and 7, coming from storage coils not shown in the figures.
  • Mechanical drive means not shown in the figures, such as knobs driven by a motor and between which the solid filler material engages, force the thermoplastic filler material inside the extrusion pipes 4 and 5 in the direction of the lower end of the extrusion pipes.
  • the extrusion conduits 4 and 5 are each separated into two lower branches 41, 42, 51, 52 respectively, which open, on the lower face 8 of the heating body, in a transverse distribution groove 9
  • the orifices of the four lower branches 41, 42, 51 and 52 occupy positions regularly distributed over the length of the groove and cut said length into four substantially equal sections.
  • the underside 8 of the heating body 1 is flat. In the lower portion, the heating body 1 flares in a first longitudinal direction relative to the transverse distribution groove 9 to form a preheating shoe.
  • the flat underside 8 extends under the preheating shoe, and constitutes an anterior zone 10 or preheating surface of the ski sole.
  • the lower face portion 8 opposite the preheating shoe relative to the transverse groove 9 forms the display zone 25.
  • the transverse distribution groove 9 is closed at its two ends, to prevent too rapid creep of filler material at the ends. Its length is between 90 and 100 mm approximately, its width between 4 and 7 mm approximately, its depth between 2 and 3.5 mm approximately. Advantageously, it is possible to choose a length of approximately 95 mm, a width of approximately 6 mm, a depth of approximately 3 mm.
  • the heating body 1, as well as the means for mechanically driving the solid material, are contained in a box not shown in the figures, ensuring protection and thermal insulation of the heating body, only the underside 8 of the body. heater being visible and accessible.
  • a temperature sensor 11 is housed in the heating body 1, and is associated with temperature regulation means for maintain, during operation, the temperature of the heating body 1 at a determined value suitable for melting the thermoplastic filler material in the extrusion conduits 4 and 5.
  • the overmolding head is intended to be placed in abutment on a ski sole 12, with its lower face 8 substantially parallel to the sole surface, and to be moved longitudinally on said sole in a preferred direction of movement represented by the arrow 13 , that is to say the direction of movement in the direction of the glow shoe.
  • An advantageous arrangement consists of mechanical means allowing the ski to move in the opposite direction illustrated by arrow 130, the overmolding head remaining fixed in the longitudinal position, and being possibly articulated and urged by means of support and support producing the support force F.
  • the upstream zone of the heating body 1 comprising the front zone 10 and the downstream zone of the heating body 1 or display zone 25 are defined. .
  • the heating body 1 Downstream of the display area 25, the heating body 1 comprises a transverse scraper 14 shaped to scrape the filler material still in viscous form on the ski sole 12.
  • the scraper 14 is a steel bar of rectangular section, inclined by about thirty degrees relative to the perpendicular to the lower face 8 of the heating body 1, and fixed to the rear face of the heating body by fixing screws 15.
  • the bar has a sharp transverse lower edge 16 formed by an anterior face 17 of scraper and a rear face 24 of scraper.
  • the lower edge 16 of the bar forming the scraper 14 is slightly protruding below the lower face 8 of the heating body 1.
  • the protruding value D is advantageously between two and four tenths of a millimeter.
  • the front face 17 of the bar forms, with the lower face 8 of the heating body 1, an angle A of between one hundred and five and one hundred and thirty five degrees and forms with the surface sole to be molded at an angle B between 45 ° and 75 °.
  • Such an inclination produces a wedge effect and a flushing effect which promote the penetration of the thermoplastic material into the slots and other hollow parts of the sole to be molded.
  • An angle B greater than approximately 75 ° produces grazing phenomena.
  • An angle B less than 45 ° reduces the hunting effect too much, and results in a simple crushing effect, the result of which is less favorable. Excellent results have been obtained for an angle B of between 55 ° and 65 °, and therefore for an angle A of between 115 ° and 125 °.
  • the scraper 14 is formed by a removable and interchangeable blade, which can also be adjusted to modify at will the protrusion D of the lower edge 16 below the lower face 8 of the heating body 1. It will however be possible, without departing from the scope of the present invention, to provide a scraper 14 permanently fixed to the heating body 1, without the possibility of adjustment.
  • the operation of the device of the present invention for obtaining a selective overmolding limited to degraded surface areas, is improved by the application of a sufficient force F on the heating body 1 in the direction of the ski sole. , oriented substantially vertically from the display area 25, as shown by arrow 18.
  • the force F is generally between 200 and 500 Newton.
  • Such a force F advantageously of the order of 200 to 250 Newton, can be produced by hand by the operator.
  • the force F can be produced by mechanical means, making it possible to maintain and control the application and the direction of this force, and to adjust it to an adequate value to obtain a regular result.
  • the overmolding head is, for this, associated with support means making it possible to support on the one hand the overmolding head and on the other hand the ski to be overmolded.
  • Mechanical means make it possible to drive the overmolding head and the ski 12 in relative longitudinal translation, at a speed V advantageously between 3 and 4 meters per minute, and mechanical means make it possible to maintain the body in support according to the force F determined. heating 1 against the ski sole according to its underside 8, as shown in FIG. 1.
  • the mechanical drive means of the filler material ensure a continuous and regular supply of polyethylene, at a rate sufficient to fill, with a slight excess, the hollow areas of the ski sole 12.
  • force F can be reduced in proportion.
  • Such a device can then more easily be manipulated and actuated by hand, without requiring mechanical means for producing the force F.
  • a driving roller can however assist the operator to produce the regular advance of the device on the sole of ski in the direction of arrow 13.
  • the heating body 1 is kept in abutment on the ski sole 12, applying the necessary force F and said heating body 1 and the ski are driven in relative translation, for example skiing in the direction represented by the arrow 130 relative to a fixed heating body 1.
  • the heating body 1 is maintained at a suitable temperature for melting the thermoplastic material 6, 7 introduced into the extrusion conduits 4 and 5, the filler material being gradually softened in the heating body and conveyed in liquid form under the heating body, and distributed in the transverse distribution groove 9.
  • the flat bottom face 8 of the heating body 1 ensures on the one hand the preheating of the sole part 12 located upstream under the anterior zone 10, then the crushing and spreading of the filler material by the spreading zone 25.
  • thermoplastic filler material still in viscous form, is removed under pressure by the transverse scraper 14.
  • the scraper 14 is in sliding support on the lower edges 22 and 23 of the ski. Good results are obtained by using a lower face 8 of the heating body 1, the total length of which is between approximately 90 and 110 mm, so that the preheating of the sole to be molded is sufficient.
  • the relative position of the underside 8 of the heating body 1 and the sole 12 of the ski must advantageously be kept constant during the molding operation.
  • the lower face 8 must be slightly detached from the sole to be molded 12 from the ski, so that the only contact with the sole is ensured by the scraper.
  • an anterior roller 26 is provided, mounted idly on a transverse axis 27 integral with the not shown fixing means of the heating body 1, such that the anterior end 28 of the lower face 8 is separated from the ski sole 12 by a space E advantageously between 1 and 3 mm, for example 2 mm.
  • Space E prevents the surface to be molded from coming into contact with parts of the lower heating face 8, as a function of the camber of the ski, which, by reducing the force F, would disturb the effectiveness of the scraper 14.
  • the roller 26 can advantageously be motorized.
  • thermoplastic material in the hollow zones of the sole 12 to be overmolded, zones which have been shown under the references 19 and 20 on the Figure 1, while the flat areas such as the area 21 of the sole 12 retain practically no molding material.
  • the thermoplastic filler material forms a slight excess thickness above the generally flat surface of the sole 12. It is then enough, by a light scraping, sanding or subsequent grinding, to reduce the overthickness and a regular sole surface is thus obtained in which the thermoplastic filler material is limited to only the hollow areas requiring repair.
  • the flat areas 21 of the sole 12, made of a very high molecular weight polyethylene are not degraded by the heat provided by the heating body 1 or the overmolding material during their passage, and retain their superior sliding properties.
  • the method of the invention avoids superimposing a hot film of filler material on the flat areas 21 of the sole 12, a film which heats the sole by conduction and makes it lose the properties specific to sintered polyethylene.
  • FIG 3 there is shown a general view of an advantageous embodiment of the device according to the invention.
  • the device comprises a fixed frame 100 carrying the overmolding head.
  • Drive means are provided for driving the ski 12 in longitudinal translation.
  • the heating body 1 is mounted oscillating on the transverse axis 101 of a support arm 104 pivoting on an axis 105 fixed to the frame 100, while the ski 12 is driven in translation by support means 30 and 102 in a preferential direction represented by the arrow 130.
  • the pivoting movements are represented by the double arrow 106 and make it possible to move the molding head 1 closer and further away from a driving roller.
  • the direction of relative movement 130 of the ski 12 defines the longitudinal direction; the transverse direction is a horizontal perpendicular to the longitudinal direction.
  • the support means comprise a straddle 30, integral with the ski 12, and biased by a driving roller 102 mounted in rotation according to a motorized transverse shaft 103.
  • the rotation shaft 103 of the driving roller 102 is disposed substantially along a vertical transverse plane II passing through the middle of the overmolding head 1.
  • the assembly formed by the straddle member 30 and the ski 12 is inserted in translation between the roller driver 102 and the overmolding head 1.
  • the overmolding head 1 is supported on the sliding surface 61 of the ski, while the driving roller 102 is supported on the flat or notched outer face 29 of the straddle 30.
  • Maintaining the ski 12 and the straddle 30 during their passage between the driving roller 102 and the overmolding head 1 can be supplemented by an upstream support roller 114 and a downstream support roller 115, disposed respectively upstream and downstream of the overmolding head as shown in the figure, and journalling respectively on horizontal transverse axes carried by the frame 100.
  • the support rollers 114 and 115 are arranged in a substantially horizontal plane passing through the contact generator of the driving roller 102.
  • the driving roller 102 is rotated, in the direction shown by the arrow 107, by a motor not shown in the figures.
  • the pressing arm 104 is biased by a spring or a jack such as a gas jack, not shown in the figures, applying the overmolding head 1 against the sliding face 61 of the ski mounted on the straddle 30 in the direction of the roller. coach 102.
  • the straddle 30 is shaped to compensate for natural irregularities in the shape of the ski 12.
  • the straddle 30 must adapt to the shape of traditional skis, which have a body of ski 60 elongated and flattened, limited by the sliding face 61, by the upper face 62 and by two side edges.
  • the front end of the body 60 is bent upwards to form a spatula 63, and its rear end is slightly bent upwards to form a heel 64.
  • the body 60 has a variable thickness depending on the longitudinal position considered along of the ski, the thickness being greater in the central part of the body 60 than in the vicinity of the ends of the ski.
  • the upper face 62 receives the bindings 65 and 66 allowing the adaptation and the maintenance of a ski boot, when using the ski on snow.
  • the body 60 is arched, so that, when the ski is placed on a plane along its lower sliding face 61, it rests along two lines located in the vicinity of the ends of the ski, the central part of the sliding face 61 being raised with respect to the support plane.
  • the straddle member 30 comprises a rectilinear longitudinal beam 34 with a general U-shaped section, its outer face 35 receiving a notched tread 36.
  • the beam 34 carries sliding wedges such as the wedge 37.
  • the shims can be adjusted in longitudinal position along the beam 34 by sliding, for example according to a structure schematically shown in Figure 5 in cross section.
  • the shims 37, 38, 39 and 40 have adjustable heights, and chosen in such a way that, when the ski is in the overmolding position as shown in FIG. 3, the shims compensate for the camber of the ski and tend to make its face sliding 61 to be overmolded substantially planar and parallel to the outer surface 35 of the beam 34.
  • the attachment is provided by means 43 for attaching the tip 63, means 44 for attaching the heel 64, and means for attaching an intermediate part of the body of ski.
  • the attachment of the intermediate part of the ski body can advantageously be ensured by the intermediate wedge 37, shaped to come under the wings of the front binding 65 of the ski.
  • Such embedding prevents that one can separate the ski 12 and the straddle 30 by a simple translational movement perpendicular to the sliding surface of the ski. It is thus possible to manipulate the ski-straddle assembly by the single ski, without the risk of seeing the ski unhook from the straddle.
  • the attachment means 43 of the spatula comprises a transverse retaining spacer 46 connecting two lateral support flanges 45 substantially shaped to the profile of the spatula 63 and provided with pads 48 and 49.
  • the pads and the flanges are integral with the beam 34 and arranged, as shown in the figures, in such a way that the tip 63 can be engaged between the flanges 45 and the retaining spacer 46 and that, when the tip is thus engaged and the ski heel is lowered as the represents the arrow 47 of FIG. 6, the spatula 63 is wedged by pressing on the upper face of the pads 48 and 49 and immobilized under the lower face of the retaining spacer 46.
  • the support flanges 45 are advantageously provided with flexible pads 48 and 49 forming a flexible and elastic support for the corresponding face of the spatula 63.
  • the means 44 for securing the heel 64 comprises an enveloping rear stop 53, comprising a projecting part 54 under which a short length of the heel 64 engages.
  • the rear stop 53 is rounded to form a progressive routing ramp of the overmolding head on the ski.
  • the curvature of this stop 53 must be adapted so that the overmoulding shoe 1 alone is in support, without the scraper blade coming to bear on this stop. Such support could indeed damage the blade.
  • a thin sheet 55 is superimposed on the rounded shape of the rear stop 53.
  • the sheet 55 has a double role: it firstly wipes the initial flow of polyethylene leaving the overmolding head; this initial flow generally comprises relatively carbonized polyethylene which is unsuitable for overmolding, the material of which it is made having parked in standby in the heating body and having been overheated during cycle interruptions.
  • the thin sheet 55 for example of copper, also allows good connection of the molding sole with different shapes of ski heels, favoring by deforming slightly a clean start of the molding in the heel.
  • the rear stop 53 is movable longitudinally as shown by the double arrow 56, for the installation of the device: when the ski 12 is in place, the heel 64 being in position, the stop 53 is advanced so that its projection 54 partially covers the heel 64.
  • the intermediate wedge 40 adjustable in longitudinal position and adjustable in height, makes it possible, in cooperation with the stop posterior 53, good blocking of the heel 64.
  • the ski 12 and the straddle member 30 thus form a one-piece assembly, the ski being pressed against the straddle member during the introduction between the driving roller 102 and the overmolding head 1, heel forward, in the longitudinal direction represented by the arrow 130.
  • the rotation of the roller 102 in the direction represented by the arrow 107, drives the assembly formed by the ski 12 and the straddle member 30 at an appropriate regular translation speed, the sliding surface 61 of the ski being supported on the heating and spreading pad, the driving roller 102 being in abutment on the outer face 29 of the coach.
  • the driving roller 102 can advantageously be provided, at its periphery, with transverse notches complementary to the notches of the tread 36. This avoids slipping between the driving roller 102 and the straddle 30, so that the straddle is driven at regular speed.
  • the straddle device according to the invention also has the advantage of facilitating the subsequent treatment of the ski after overmolding.
  • the ski is generally routed, after overmolding, to an abrasive belt or stone sander.
  • the most modern sanders have an automatic drive.
  • the straddle is adapted to also pass in such coaches. As a result, it is no longer necessary to move the ski from one workstation to another, and one can provide a device comprising a molding head followed by a sander, the two operations being carried out one after the other by a single translation of the straddle and the ski.
  • the device of the invention further comprises means for adjusting the speed of the motor driving the solid filler material for its introduction into the heating body 1, associated with means for adjusting the the pressing force F.
  • the adjustment can be simultaneous by a single control member. These means make it possible, by increasing the flow rate of the filler material, for example by approximately 50%, and simultaneously reducing the bearing force F, for example by setting it at around 150 Newton, to significantly reduce the hunting effect of the scraper 14 and to deposit more filler material on the ski. This adjustment can be useful when the heel and the tip of the ski are concave, the complete overmolding then making it possible to reload this concavity and restore a regulated sole.

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  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Description

La présente invention concerne un procédé et un dispositif de surmoulage par balayage de semelles de ski en matériau thermoplastique.The present invention relates to a method and a device for molding by scanning ski soles made of thermoplastic material.

Ce procédé et ce dispositif sont définis dans les revendications 1 et 8 respectivement.This method and this device are defined in claims 1 and 8 respectively.

Le développement des résines thermoplastiques comme revêtement constituant la semelle ou surface de glisse des skis a conduit au développement de machines pour effectuer des opérations de réparation ou de rénovation de ces semelles de ski, pour en restituer un état de surface exempt d'aspérités ou de fissures et redonner à ces revêtements les caractéristiques mécaniques originales.The development of thermoplastic resins as a coating constituting the sole or sliding surface of skis has led to the development of machines for carrying out repair or renovation operations on these ski soles, in order to restore a surface condition free of roughness or cracks and restore the original mechanical characteristics to these coatings.

On connait déjà de tels procédés et dispositifs de surmoulage de semelles de ski, décrits par exemple dans le brevet FR-A-2 391 054. Dans un tel procédé connu, on achemine en continu un matériau d'apport thermoplastique sous forme solide dans un corps de chauffe conformé en patin d'étalage, le matériau d'apport étant progressivement ramolli dans le corps de chauffe et acheminé sous forme liquide sous le patin pour être écrasé et étalé sur la semelle de ski lors du mouvement de balayage ou de translation longitudinale du patin sur le ski. Le dispositif pour la mise en oeuvre de ce procédé comprend des moyens d'alimentation en matériau thermoplastique d'apport, un corps de chauffe à patin d'étalage conformé pour recevoir le matériau d'apport sous forme solide, pour le chauffer et le ramollir progressivement, pour l'amener sous forme liquide sous une structure de répartition et d'étalage destinée à être pressée contre la semelle de ski et à être entraînée en translation longitudinale sur ladite semelle de ski dans un sens de propagation préférentiel. Le patin comporte une avancée pour préchauffer la semelle de ski en amont de la structure de répartition.Such processes and devices for molding ski soles are already known, described for example in patent FR-A-2 391 054. In such a known method, a thermoplastic filler material is continuously fed in a solid form. heating body shaped as a display shoe, the filler material being gradually softened in the heating body and conveyed in liquid form under the shoe to be crushed and spread on the ski sole during the sweeping or longitudinal translation movement skating on the ski. The device for implementing this process comprises means for supplying thermoplastic filler material, a heating body with a display shoe shaped to receive the filler material in solid form, for heating and softening it gradually, to bring it in liquid form under a distribution and spreading structure intended to be pressed against the ski sole and to be driven in longitudinal translation on said ski sole in a preferential direction of propagation. The skate has a projection for preheating the ski sole upstream of the distribution structure.

La matière constituant les semelles de ski est généralement un polyéthylène. Pour réaliser un surmoulage présentant des propriétés d'accrochage suffisantes sur la semelle préexistante, on utilise généralement comme matériau d'apport thermoplastique un polyéthylène sous forme solide, en bande, en fil ou en granule.The material constituting the ski soles is generally a polyethylene. To produce an overmolding having sufficient bonding properties on the preexisting sole, polyethylene in solid form, strip, wire or granule is generally used as thermoplastic filler material.

Depuis quelques temps, pour augmenter les qualités de glisse des skis, les fabricants ont développé des semelles de glisse en polyéthylène à très haut poids moléculaire. De telles semelles de ski sont obtenues par frittage, et formées par tranchage. Les qualités de glisse ainsi obtenues sont supérieures à celles réalisées avec des polyéthylène à poids moléculaire inférieur, tels que les polyéthylènes moulés à chaud à une température dépassant le point de ramollissement.For some time, to increase the sliding qualities of skis, manufacturers have developed gliding soles in very high molecular weight polyethylene. Such ski soles are obtained by sintering, and formed by slicing. The sliding qualities thus obtained are superior to those produced with polyethylene of lower molecular weight, such as polyethylenes hot molded at a temperature above the softening point.

On constate que, lorsque l'on surmoule une telle semelle en polyéthylène à très haut poids moléculaire à l'aide d'un dispositif de surmoulage connu, qui recouvre ladite semelle d'une pellicule de polyéthylène fondu, on perd une grande partie des avantages de la semelle initiale en polyéthylène à très haut poids moléculaire, et on perd en particulier son pouvoir de glisse supérieur. Les dispositifs connus conduisent en effet à recouvrir totalement la semelle préexistante avec une pellicule de polyéthylène fondu, pellicule que l'on réduit ensuite par rabotage et par ponçage.It can be seen that, when such a very high molecular weight polyethylene sole is molded using a known overmolding device, which covers said sole with a film of molten polyethylene, a large part of the advantages are lost. of the initial sole made of very high molecular weight polyethylene, and in particular it loses its superior sliding power. The known devices lead in fact to completely cover the preexisting sole with a film of molten polyethylene, a film which is then reduced by planing and sanding.

On a tenté de réduire les effets défavorables du surmoulage en réduisant la surface finale du polyéthylène déposé par fusion. La demanderesse a tenté ainsi de réduire cette surface par un usinage ultérieur de la semelle surmoulée jusqu'à faire apparaître les parties planes de polyéthylène à très haut poids moléculaire, ne laissant le polyéthylène fondu que dans les zones creuses qui justifiaient le surmoulage. Cette tentative a toutefois montré que le résultat obtenu est décevant, car on ne retrouve pas les qualités de glisse de la semelle initiale.Attempts have been made to reduce the adverse effects of overmolding by reducing the final surface area of the melt-deposited polyethylene. The Applicant has thus attempted to reduce this surface by subsequent machining of the overmolded sole until the flat parts of very high molecular weight polyethylene appear, leaving the molten polyethylene only in the hollow areas which justified overmolding. This attempt has however shown that the result obtained is disappointing, because we do not find the sliding qualities of the initial sole.

Un tel procédé conduit en outre à une perte de matière non négligeable, car les procédés et dispositifs connus de surmoulage nécessitent de déposer une couche de matériau thermoplastique d'épaisseur suffisante, et la plus grande partie de cette épaisseur doit ensuite être enlevée.Such a method also leads to a significant loss of material, since the known methods and devices for overmolding require depositing a layer of thermoplastic material of sufficient thickness, and most of this thickness must then be removed.

La présente invention a notamment pour but de réaliser un surmoulage de semelle de ski par balayage permettant de conserver au maximum les qualités de glisse du matériau constituant la semelle d'origine, en évitant de recharger en matériau thermoplastique d'apport les parties planes de semelles de ski, et en rechargeant suffisamment les parties creuses de semelles. La difficulté est en particulier de recharger suffisamment les parties creuses de semelles, afin d'éviter d'obtenir à nouveau des parties creuses après retrait de la matière de surmoulage au refroidissement.The object of the present invention is in particular to produce a molding of the ski sole by sweeping, making it possible to conserve the sliding qualities of the material constituting the original sole as much as possible, while avoiding recharging the flat parts of the soles with thermoplastic material. ski, and by sufficiently recharging the hollow parts of the soles. The difficulty is in particular to sufficiently recharge the hollow parts of the soles, in order to avoid obtaining hollow parts again after removal of the overmolding material on cooling.

La présente invention a également pour but de réduire le plus possible le temps d'échauffement du polyéthylène à très haut poids moléculaire formant la semelle initiale à surmouler. La réduction du temps d'échauffement implique une augmentation de la vitesse de translation du dispositif de surmoulage par rapport à la semelle de ski, vitesse qui tend à réduire le temps nécessaire pour le surmoulage et à augmenter donc la cadence de production.The present invention also aims to reduce as much as possible the heating time of the very high molecular weight polyethylene forming the initial sole to be molded. The reduction of the heating time implies an increase in the speed of translation of the overmolding device relative to the ski sole, speed which tends to reduce the time required for overmolding and therefore to increase the production rate.

Une première tentative peut consister à augmenter la puissance de chauffe des résistances logées dans le patin d'étalage, afin d'augmenter sa température et d'accroître la vitesse d'échauffement du matériau plastique d'apport et de la semelle à surmouler. Il s'est toutefois avéré qu'une telle tentative conduit à un échec, car elle permet d'augmenter légèrement la vitesse de balayage, mais la couche de polyéthylène déposée faisant office de matelas thermique conserve encore trop longtemps la chaleur sur la semelle de ski. Une augmentation plus sensible de la puissance et de la température de chauffe entraîne la détérioration du matériau d'apport, et la production de fumées, notammment pendant les temps d'arrêt entre deux opérations de surmoulage.A first attempt may consist in increasing the heating power of the resistors housed in the display pad, in order to increase its temperature and to increase the heating rate of the plastic filler material and of the sole to be molded. It turned out, however, that such an attempt leads to failure, because it makes it possible to slightly increase the scanning speed, but the layer of polyethylene deposited acting as thermal mattress still keeps the heat on the ski sole for too long. . A more appreciable increase in the power and the heating temperature leads to the deterioration of the filler material, and the production of fumes, in particular during the downtimes between two overmolding operations.

En outre, les buts recherchés par l'invention ne doivent pas conduire à diminuer la qualité du surmoulage obtenu, ni la répartition de la matière déposée sur la semelle.In addition, the aims sought by the invention must not lead to a reduction in the quality of the overmolding obtained, or the distribution of the material deposited on the sole.

Un autre but de l'invention est de réaliser un dispositif de surmoulage semi-automatique, assurant par lui-même le transfert relatif du ski et du dispositif de surmoulage ; selon l'invention, on cherche à réduire l'encombrement du dispositif, et en particulier à concevoir un tel dispositif présentant un encombrement nettement inférieur à la longueur du ski. Il faut pour cela prévoir des moyens nouveaux assurant le maintien du ski et son transfert selon une vitesse régulière dans le dispositif.Another object of the invention is to provide a semi-automatic overmolding device, ensuring by itself the relative transfer of the ski and the overmolding device; according to the invention, it is sought to reduce the size of the device, and in particular to design such a device having a size significantly less than the length of the ski. This requires new means ensuring the maintenance of the ski and its transfer at a regular speed in the device.

Pour atteindre les effets recherchés ainsi que d'autres, dans une tête de surmoulage, le matériau thermoplastique d'apport est successivement chauffé dans des canaux de chauffe, introduit dans une gorge transversale de répartion ménagée en face inférieure de la structure de patin d'étalage, écrasé et étalé sur la semelle de ski par une surface d'étalage, et, en fin de zone d'étalage sous le patin d'étalage, le matériau thermoplastique d'apport encore sous forme visqueuse est immédiatement chassé sous pression par un racloir transversal. L'opération consistant à chasser sous pression ne doit pas être confondue avec un simple raclage. Au cours de cette opération, la pression provoque vraisemblablement une légère expulsion de matériau d'apport en aval du racloir à travers les creux de la surface à surmouler, et le matériau d'apport se détend quand il passe de l'état visqueux et comprimé à l'état solide. Il en résulte une surépaisseur de polyéthylène d'apport dans les zones creuses de surface nécessitant une réparation. Cet effet ne serait pas obtenu avec un raclage traditionnel.To achieve the desired effects as well as others, in a molding head, the thermoplastic filler material is successively heated in heating channels, introduced into a transverse distribution groove formed on the underside of the skate structure. display, crushed and spread on the ski sole by a display surface, and, at the end of the display area under the display shoe, the thermoplastic filler material still in viscous form is immediately removed under pressure by a transverse scraper. The process of hunting under pressure should not be confused with a simple scraping. During this operation, the pressure probably causes a slight expulsion of filler material downstream of the scraper through the recesses of the surface to be overmolded, and the filler material relaxes when it passes from the viscous and compressed state to the solid state. This results in an excess thickness of filler polyethylene in the hollow surface areas requiring repair. This effect would not be obtained with a traditional scraping.

De préférence, le racloir transversal est constitué d'une lame portée sensiblement à température du patin d'étalage ; le racloir est solidaire dudit patin d'étalage.Preferably, the transverse scraper consists of a blade brought substantially to the temperature of the display shoe; the scraper is integral with said display shoe.

La lame est avantageusement constituée d'une arête inférieure vive transversale sensiblement rectiligne séparant une face antérieure et une face postérieure.The blade advantageously consists of a substantially straight transverse lower edge separating an anterior face and a posterior face.

Pendant le mouvement de balayage, on peut maintenir avantageusement le racloir transversal en appui glissant sur les carres inférieures du ski, le matériau thermoplastique d'apport assurant une lubrification suffisante pour favoriser le glissement entre le racloir et les carres du ski sans usure excessive du racloir et des carres.During the sweeping movement, the transverse scraper can advantageously be held in sliding contact with the lower edges of the ski, the thermoplastic filler material providing sufficient lubrication to promote sliding between the scraper and the ski edges without excessive wear of the scraper and edges.

La tête de surmoulage selon la présente invention reprend sensiblement la structure des dispositifs décrits dans le brevet FR-A-2 391 054, et comprend en outre, en aval de la zone de répartition, un racloir transversal conformé pour racler le matériau d'apport encore sous forme liquide sur la semelle de ski.The overmolding head according to the present invention substantially takes up the structure of the devices described in patent FR-A-2 391 054, and further comprises, downstream of the distribution zone, a transverse scraper shaped to scrape the filler material still in liquid form on the ski sole.

Le racloir transversal est, de préférence, une lame en matière conductrice de la chaleur et soumise à l'action de moyens de chauffe la portant à une température au moins égale à la température de ramollissement du matériau d'apport.The transverse scraper is preferably a blade made of heat conducting material and subjected to the action of heating means bringing it to a temperature at least equal to the softening temperature of the filler material.

On peut avantageusement utiliser une lame sous forme d'un barreau d'acier à section rectangulaire, solidaire du patin d'étalage, et ainsi entraînée en translation et chauffée par le patin d'étalage. L'une des arêtes du barreau d'acier forme l'arête inférieure vive qui dépasse au-dessous de la surface de répartition et d'étalage du patin.It is advantageously possible to use a blade in the form of a steel bar of rectangular section, integral with the display shoe, and thus driven in translation and heated by the display shoe. One of the edges of the steel bar forms the sharp lower edge which protrudes below the distribution and display surface of the shoe.

On a trouvé que le résultat peut être notablement amélioré, d'une part en augmentant sensiblement la vitesse de translation, mais en outre en réglant simultanément de manière appropriée plusieurs des paramètres de forme du patin de chauffe et d'étalage.It has been found that the result can be markedly improved, on the one hand by appreciably increasing the speed of translation, but also by simultaneously adjusting several of the shape parameters of the heating and display pad appropriately.

Pour cela, selon un mode de réalisation avantageux, l'arête dépassante du racloir dépasse au-dessous de la surface de répartition et d'étalage du patin selon une hauteur comprise entre deux et quatre dixièmes de millimètres. Egalement, la face antérieure de racloir forme, avec la surface de répartition et d'étalage du patin, un angle compris entre cent cinq et cent trente cinq degrés, avantageusement cent vingt degrés environ.For this, according to an advantageous embodiment, the projecting edge of the scraper protrudes below the distribution and spreading surface of the skate at a height of between two and four tenths of a millimeter. Also, the front face of the scraper forms, with the distribution and spreading surface of the shoe, an angle between one hundred and five and one hundred and thirty five degrees, advantageously one hundred and twenty degrees approximately.

Les essais ont montré qu'une pression suffisante doit être appliquée par le patin sur le matériau thermoplastique d'apport dans la zone située entre le patin et la semelle a surmouler. Pour appliquer une telle pression, qui doit être contrôlée, on peut avantageusement associer le patin à une structure de châssis fixe comprenant des moyens pour supporter le patin et le ski à surmouler, des moyens pour entraîner en translation longitudinale relative le patin et le ski, et des moyens pour maintenir en appui selon une force déterminée le patin contre la semelle de ski pendant le mouvement de translation longitudinale. La force d'appui appliquée sur le patin est avantageusement comprise entre deux cents et cinq cents Newton, la vitesse de translation étant avantageusement comprise entre 3 et 4 mètres par minute.Tests have shown that sufficient pressure must be applied by the pad on the thermoplastic filler material in the area between the pad and the sole to be molded. To apply such pressure, which must be controlled, it is advantageous to associate the skate with a fixed chassis structure comprising means for supporting the skate and the ski to be overmolded, means for driving the skate and the ski in relative longitudinal translation, and means for holding the pad against a ski sole against a determined force during the longitudinal translational movement. The bearing force applied to the shoe is advantageously between two hundred and five hundred Newton, the translation speed being advantageously between 3 and 4 meters per minute.

Selon un mode de réalisation avantageux, la tête de surmoulage est montée oscillante sur un axe transversal fixé à un bras presseur relié au bâti, tandis que le support de ski est mobile et entraîné en translation longitudinale. Le support de ski comprend un enjambeur mobile et amovible comportant une poutre rectiligne associée à des cales et à des moyens de tenue du ski. La surface externe de la poutre rectiligne forme une surface d'appui, opposée à la surface à usiner du ski, sur laquelle roule un rouleau entraîneur à arbre de rotation transversal sollicité par un moteur et monté sur le bâti. Des moyens presseurs produisent une pression appropriée pour maintenir la tête de surmoulage en appui contre le ski. L'arbre de rotation du rouleau est avantageusement disposé selon le plan transversal vertical moyen de la tête de surmoulage. Ainsi, le rouleau et l'effort de compression de la tête de surmoulage sont opposés par rapport à l'ensemble formé par le ski et l'enjambeur, et situés dans le même plan transversal vertical.According to an advantageous embodiment, the overmolding head is mounted oscillating on a transverse axis fixed to a pressing arm connected to the frame, while the ski support is mobile and driven in longitudinal translation. The ski support comprises a movable and removable straddle comprising a rectilinear beam associated with wedges and with means for holding the ski. The external surface of the rectilinear beam forms a bearing surface, opposite to the surface to be machined of the ski, on which rolls a driving roller with transverse rotation shaft urged by a motor and mounted on the frame. Pressing means produce an appropriate pressure to keep the overmolding head in abutment against the ski. The rotation shaft of the roller is advantageously arranged along the mean vertical transverse plane of the overmolding head. Thus, the roller and the compression force of the molding head are opposite with respect to the assembly formed by the ski and the straddle, and located in the same vertical transverse plane.

De préférence, la surface d'appui de l'enjambeur comporte des crans coopérant avec des crans correspondants ménagés en surface du rouleau entraîneur.Preferably, the straddle bearing surface includes notches cooperating with corresponding notches formed on the surface of the driving roller.

D'autres objets, caractéristiques et avantages de la présente invention ressortiront de la description suivante d'un mode de réalisation particulier, faite en relation avec les figures jointes, parmi lesquelles :

  • la figure 1 représente une vue schématique en perspective d'une tête de surmoulage selon la présente invention, en fonctionnement sur une semelle de ski à surmouler ;
  • la figure 2 est une vue de côté en coupe longitudinale d'une tête de surmoulage selon la présente invention ;
  • la figure 3 est une vue de face, en coupe partielle, d'un dispositif de surmoulage selon la présente invention comprenant une tête de surmoulage et des moyens de maintien du ski ;
  • la figure 4 est une coupe longitudinale d'un enjambeur support de ski selon la présente invention ;
  • la figure 5 est une coupe transversale selon le plan C-C de la figure 4 ;
  • la figure 6 représente, en vue de face, le détail des moyens de liaison entre l'enjambeur et la spatule d'un ski ;
  • la figure 7 représente ces mêmes moyens de liaison en vue en bout ; et
  • la figure 8 représente, en vue de face, le détail de réalisation des moyens de liaison entre le talon de ski et l'enjambeur.
Other objects, characteristics and advantages of the present invention will emerge from the following description of a particular embodiment, given in relation to the attached figures, among which:
  • Figure 1 shows a schematic perspective view of an overmolding head according to the present invention, in operation on a ski sole to be overmolded;
  • Figure 2 is a side view in longitudinal section of an overmolding head according to the present invention;
  • Figure 3 is a front view, in partial section, of an overmolding device according to the present invention comprising an overmolding head and means for holding the ski;
  • Figure 4 is a longitudinal section of a ski support straddle according to the present invention;
  • Figure 5 is a cross section along the plane CC of Figure 4;
  • 6 shows, in front view, the detail of the connecting means between the straddle and the tip of a ski;
  • Figure 7 shows these same connecting means in end view; and
  • Figure 8 shows, in front view, the detail of the connection means between the ski heel and the straddle.

La tête de surmoulage selon la présente invention, représentée schématiquement sur les figures 1 et 2, comporte essentiellement un corps de chauffe, généralement référencé 1, en métal thermiquement conducteur, dans lequel sont logées des cartouches chauffantes telles que les cartouches 2 et 3 renfermant une répartition de résistances électriques. Les cartouches chauffantes 2 et 3 sont réparties dans le corps de chauffe pour assurer une répartition appropriée de température dans le corps de chauffe. La partie centrale du corps de chauffe, lors du fonctionnement, est portée à une température comprise entre 320 et 340° C, avantageusement 330° C environ. Le corps de chauffe 1 est traversé de part en part par des conduits d'extrusion tels que le conduit 4. On peut par exemple prévoir deux conduits d'extrusion 4 et 5 dont les portions supérieures sont sensiblement parallèles. L'extrémité supérieure des conduits d'extrusion est conformée pour recevoir le matériau d'apport sous forme solide. Par exemple, le matériau d'apport peut être sous forme d'un fil de polyéthylène, ou de deux fils de polyéthylène généralement référencés 6 et 7, en provenance de bobineaux d'emmagasinement non représentés sur les figures. Des moyens d'entraînement mécanique, non représentés sur les figures, tels que des mollettes entraînées par un moteur et entre lesquelles s'engage le matériau d'apport solide, forcent le materiau d'apport thermoplastique à l'intérieur des conduits d'extrusion 4 et 5 en direction de l'extrémité inférieure des conduits d'extrusion.The overmolding head according to the present invention, shown diagrammatically in FIGS. 1 and 2, essentially comprises a heating body, generally referenced 1, made of thermally conductive metal, in which are housed heating cartridges such as cartridges 2 and 3 containing a distribution of electrical resistances. The heating cartridges 2 and 3 are distributed in the heating body to ensure an appropriate distribution of temperature in the heating body. The central part of the heating body, during operation, is brought to a temperature between 320 and 340 ° C, advantageously about 330 ° C. The heating body 1 is traversed right through by extrusion conduits such as the conduit 4. One can for example provide two extrusion conduits 4 and 5 whose upper portions are substantially parallel. The upper end of the extrusion conduits is shaped to receive the filler material in solid form. For example, the filler material may be in the form of a polyethylene wire, or two polyethylene wires generally referenced 6 and 7, coming from storage coils not shown in the figures. Mechanical drive means, not shown in the figures, such as knobs driven by a motor and between which the solid filler material engages, force the thermoplastic filler material inside the extrusion pipes 4 and 5 in the direction of the lower end of the extrusion pipes.

Selon un premier mode de réalisation, les conduits d'extrusion 4 et 5 se séparent chacun en deux branches inférieures respectivement 41, 42, 51, 52, qui débouchent, en face inférieure 8 du corps de chauffe, dans une rainure transversale de répartition 9. Les orifices des quatre branches inférieures 41, 42, 51 et 52 occupent des positions régulièrement réparties sur la longueur de la gorge et découpent ladite longueur en quatre tronçons sensiblement égaux.According to a first embodiment, the extrusion conduits 4 and 5 are each separated into two lower branches 41, 42, 51, 52 respectively, which open, on the lower face 8 of the heating body, in a transverse distribution groove 9 The orifices of the four lower branches 41, 42, 51 and 52 occupy positions regularly distributed over the length of the groove and cut said length into four substantially equal sections.

Selon un mode de réalisation avantageux, on peut supprimer les branches externes 42 et 52 et conserver seulement les branches internes 41 et 51 obliques et convergeantes, débouchant dans la rainure transversale 9 selon deux orifices distants d'environ 15 millimètres. Le matériau d'apport est ainsi moins vite chassé vers les bords de la surface à surmouler. La face inférieure 8 du corps de chauffe 1 est plane. En portion inférieure, le corps de chauffe 1 s'évase dans une première direction longitudinale par rapport à la rainure transversale de répartition 9 pour former un sabot de préchauffe. La face inférieure plane 8 se prolonge sous le sabot de préchauffe, et constitue une zone antérieure 10 ou surface de préchauffe de la semelle de ski. La partie de face inférieure 8 opposée au sabot de préchauffage par rapport à la gorge transversale 9 forme la zone d'étalage 25.According to an advantageous embodiment, it is possible to omit the external branches 42 and 52 and to keep only the internal branches 41 and 51 oblique and converging, opening into the transverse groove 9 according to two orifices distant by approximately 15 millimeters. The filler material is thus less quickly driven to the edges of the surface to be overmolded. The underside 8 of the heating body 1 is flat. In the lower portion, the heating body 1 flares in a first longitudinal direction relative to the transverse distribution groove 9 to form a preheating shoe. The flat underside 8 extends under the preheating shoe, and constitutes an anterior zone 10 or preheating surface of the ski sole. The lower face portion 8 opposite the preheating shoe relative to the transverse groove 9 forms the display zone 25.

La gorge transversale 9 de répartition est fermée à ses deux extrémités, pour empêcher le fluage trop rapide de matériau d'apport aux extrémités. Sa longueur est comprise entre 90 et 100 mm environ, sa largeur comprise entre 4 et 7 mm environ, sa profondeur comprise entre 2 et 3,5 mm environ. Avantageusement on pourra choisir une longueur de 95 mm environ, une largeur de 6 mm environ, une profondeur de 3 mm environ.The transverse distribution groove 9 is closed at its two ends, to prevent too rapid creep of filler material at the ends. Its length is between 90 and 100 mm approximately, its width between 4 and 7 mm approximately, its depth between 2 and 3.5 mm approximately. Advantageously, it is possible to choose a length of approximately 95 mm, a width of approximately 6 mm, a depth of approximately 3 mm.

Le corps de chauffe 1, ainsi que les moyens d'entrainement mécanique du matériau solide, sont contenus dans un boitier non représenté sur les figures, assurant la protection et l'isolement thermique du corps de chauffe, seule la face inférieure 8 du corps de chauffe étant apparente et accessible.The heating body 1, as well as the means for mechanically driving the solid material, are contained in a box not shown in the figures, ensuring protection and thermal insulation of the heating body, only the underside 8 of the body. heater being visible and accessible.

Un capteur de température 11 est logé dans le corps de chauffe 1, et est associé à des moyens de régulation de température pour maintenir, au cours du fonctionnement, la température du corps de chauffe 1 à une valeur déterminée appropriée pour la fusion du matériau d'apport thermoplastique dans les conduits d'extrusion 4 et 5.A temperature sensor 11 is housed in the heating body 1, and is associated with temperature regulation means for maintain, during operation, the temperature of the heating body 1 at a determined value suitable for melting the thermoplastic filler material in the extrusion conduits 4 and 5.

La tête de surmoulage est destinée à être disposée en appui sur une semelle de ski 12, avec sa face inférieure 8 sensiblement parallèle à la surface de semelle, et à être déplacée longitudinalement sur ladite semelle dans un sens de déplacement préférentiel représenté par la flèche 13, c'est-a- dire le sens de déplacement en direction du sabot de préchauffe. Une disposition avantageuse consiste en des moyens mécaniques permettant au ski de se déplacer dans le sens opposé illustré par la flèche 130, la tête de surmoulage restant fixe en position longitudinale, et étant éventuellement articulée et sollicitée par des moyens de maintien et d'appui produisant la force d'appui F. On définit ainsi, par rapport à la rainure transversale de répartition 9, la zone amont du corps de chauffe 1 comprenant la zone antérieure 10, et la zone aval du corps de chauffe 1 ou zone d'étalage 25.The overmolding head is intended to be placed in abutment on a ski sole 12, with its lower face 8 substantially parallel to the sole surface, and to be moved longitudinally on said sole in a preferred direction of movement represented by the arrow 13 , that is to say the direction of movement in the direction of the glow shoe. An advantageous arrangement consists of mechanical means allowing the ski to move in the opposite direction illustrated by arrow 130, the overmolding head remaining fixed in the longitudinal position, and being possibly articulated and urged by means of support and support producing the support force F. Thus, relative to the transverse distribution groove 9, the upstream zone of the heating body 1 comprising the front zone 10 and the downstream zone of the heating body 1 or display zone 25 are defined. .

En aval de la zone d'étalage 25, le corps de chauffe 1 comprend un racloir transversal 14 conformé pour racler le matériau d'apport encore sous forme visqueuse sur la semelle de ski 12. Dans le mode de réalisation représenté, le racloir 14 est un barreau d'acier à section rectangulaire, incliné d'une trentaine de degrés par rapport à la perpendiculaire à la face inférieure 8 du corps de chauffe 1, et fixé sur la face postérieure du corps de chauffe par des vis de fixation 15. Par le fait de son inclinaison, le barreau présente une arête inférieure transversale vive 16 formée par une face antérieure 17 de racloir et une face postérieure 24 de racloir. L'arête inférieure 16 du barreau formant le racloir 14 est légèrement dépassante au dessous de la face inférieure 8 du corps de chauffe 1. La valeur de dépassement D est avantageusement comprise entre deux et quatre dixièmes de millimètres. Par le fait de l'inclinaison du barreau formant le racloir 14, la face antérieure 17 du barreau forme, avec la face inférieure 8 du corps de chauffe 1, un angle A compris entre cent cinq et cent trente cinq degrés et forme avec la surface de semelle à surmouler un angle B compris entre 45° et 75°. On peut avantageusement choisir un angle A de cent vingt degrés, et donc un angle B de 60°. Une telle inclinaison produit un effet de coin et un effet de chasse qui favorisent la pénétration du matériau thermoplastique dans les fentes et autres parties creuses de la semelle à surmouler. Un angle B supérieur à 75° environ produit des phénomènes de broutage. Un angle B inférieur à 45° réduit trop sensiblement l'effet de chasse, et résulte en un simple effet d'écrasement dont le résultat est moins favorable. Des résultats excellents ont été obtenus pour un angle B compris entre 55° et 65°, et donc pour un angle A compris entre 115° et 125°.Downstream of the display area 25, the heating body 1 comprises a transverse scraper 14 shaped to scrape the filler material still in viscous form on the ski sole 12. In the embodiment shown, the scraper 14 is a steel bar of rectangular section, inclined by about thirty degrees relative to the perpendicular to the lower face 8 of the heating body 1, and fixed to the rear face of the heating body by fixing screws 15. By due to its inclination, the bar has a sharp transverse lower edge 16 formed by an anterior face 17 of scraper and a rear face 24 of scraper. The lower edge 16 of the bar forming the scraper 14 is slightly protruding below the lower face 8 of the heating body 1. The protruding value D is advantageously between two and four tenths of a millimeter. By the fact of the inclination of the bar forming the scraper 14, the front face 17 of the bar forms, with the lower face 8 of the heating body 1, an angle A of between one hundred and five and one hundred and thirty five degrees and forms with the surface sole to be molded at an angle B between 45 ° and 75 °. One can advantageously choose an angle A of one hundred and twenty degrees, and therefore an angle B of 60 °. Such an inclination produces a wedge effect and a flushing effect which promote the penetration of the thermoplastic material into the slots and other hollow parts of the sole to be molded. An angle B greater than approximately 75 ° produces grazing phenomena. An angle B less than 45 ° reduces the hunting effect too much, and results in a simple crushing effect, the result of which is less favorable. Excellent results have been obtained for an angle B of between 55 ° and 65 °, and therefore for an angle A of between 115 ° and 125 °.

Dans le mode de réalisation représenté, le racloir 14 est formé d'une lame amovible et interchangeable, et qui peut être également réglée pour modifier à volonté le dépassement D de l'arête inférieure 16 au dessous de la face inférieure 8 du corps de chauffe 1. On pourra toutefois, sans sortir du cadre de la présente invention, prévoir un racloir 14 fixé définitivement sur le corps de chauffe 1, sans possibilité de réglage.In the embodiment shown, the scraper 14 is formed by a removable and interchangeable blade, which can also be adjusted to modify at will the protrusion D of the lower edge 16 below the lower face 8 of the heating body 1. It will however be possible, without departing from the scope of the present invention, to provide a scraper 14 permanently fixed to the heating body 1, without the possibility of adjustment.

Le fonctionnement du dispositif de la présente invention, pour l'obtention d'un surmoulage sélectif limité aux zones de surface dégradées, est amélioré par l'application d'une force F suffisante sur le corps de chauffe 1 en direction de la semelle de ski, orientée sensiblement à la verticale de la zone d'étalage 25, comme le représente la flèche 18. Pour un appareil destiné à couvrir la largeur totale du ski, la force F est généralement comprise entre 200 et 500 Newton. Une telle force F, avantageusement de l'ordre de 200 à 250 Newton, peut être produite à la main par l'opérateur. De préférence, la force F peut être produite par des moyens mécaniques, permettant de maintenir et de contrôler l'application et la direction de cette force, et de la régler à une valeur adéquate pour obtenir un résultat régulier. La tête de surmoulage est, pour cela, associée à des moyens supports permettant de supporter d'une part la tête de surmoulage et d'autre part le ski à surmouler. Des moyens mécaniques permettent d'entraîner en translation longitudinale relative la tête de surmoulage et le ski 12, selon une vitesse V avantageusement comprise entre 3 et 4 mètres par minute, et des moyens mécaniques permettent de maintenir en appui selon la force F déterminée le corps de chauffe 1 contre la semelle de ski selon sa face inférieure 8, comme le représente la figure 1. Les moyens d'entraînement mécanique du matériau d'apport assurent un apport continu et régulier de polyéthylène, selon un débit suffisant pour remplir, avec un léger excès, les zones creuses de la semelle 12 de ski.The operation of the device of the present invention, for obtaining a selective overmolding limited to degraded surface areas, is improved by the application of a sufficient force F on the heating body 1 in the direction of the ski sole. , oriented substantially vertically from the display area 25, as shown by arrow 18. For a device intended to cover the total width of the ski, the force F is generally between 200 and 500 Newton. Such a force F, advantageously of the order of 200 to 250 Newton, can be produced by hand by the operator. Preferably, the force F can be produced by mechanical means, making it possible to maintain and control the application and the direction of this force, and to adjust it to an adequate value to obtain a regular result. The overmolding head is, for this, associated with support means making it possible to support on the one hand the overmolding head and on the other hand the ski to be overmolded. Mechanical means make it possible to drive the overmolding head and the ski 12 in relative longitudinal translation, at a speed V advantageously between 3 and 4 meters per minute, and mechanical means make it possible to maintain the body in support according to the force F determined. heating 1 against the ski sole according to its underside 8, as shown in FIG. 1. The mechanical drive means of the filler material ensure a continuous and regular supply of polyethylene, at a rate sufficient to fill, with a slight excess, the hollow areas of the ski sole 12.

Pour un appareil destiné à couvrir une portion de la largeur du ski, par exemple la demi-largeur, la force F peut être réduite en proportion. Un tel appareil peut alors plus facilement être manipulé et actionné à la main, sans nécessiter de moyens mécaniques de production de la force F. Un rouleau entraîneur peut cependant assister l'opérateur pour produire l'avance régulière de l'appareil sur la semelle de ski selon la direction de la flèche 13.For a device intended to cover a portion of the width of the ski, for example half width, force F can be reduced in proportion. Such a device can then more easily be manipulated and actuated by hand, without requiring mechanical means for producing the force F. A driving roller can however assist the operator to produce the regular advance of the device on the sole of ski in the direction of arrow 13.

Lors du fonctionnement, on maintient le corps de chauffe 1 en appui sur la semelle 12 de ski, en appliquant la force F nécessaire et on entraîne en translation relative ledit corps de chauffe 1 et le ski, par exemple le ski dans le sens représenté par la flèche 130 par rapport à un corps de chauffe 1 fixe. Le corps de chauffe 1 est maintenu à une température appropriée pour fondre le matériau thermoplastique 6, 7 introduit dans les conduits d'extrusion 4 et 5, le matériau d'apport étant progressivement ramolli dans le corps de chauffe et acheminé sous forme liquide sous le corps de chauffe, et réparti dans la rainure de répartition transversale 9. La face inférieure 8 plane du corps de chauffe 1 assure d'une part le préchauffage de la partie de semelle 12 située à l'amont sous la zone antérieure 10, puis l'écrasement et l'étalage du matériau d'apport par la zone d'étalage 25. En fin de zone d'étalage 25, le matériau thermoplastique d'apport, encore sous forme visqueuse, est chassé sous pression par le racloir 14 transversal. Pendant le fonctionnement, le racloir 14 est en appui glissant sur les carres 22 et 23 inférieures du ski. De bons résultats sont obtenus en utilisant une face inférieure 8 de corps de chauffe 1 dont la longueur totale est comprise entre 90 et 110 mm environ, de sorte que le préchauffage de semelle à surmouler est suffisant.During operation, the heating body 1 is kept in abutment on the ski sole 12, applying the necessary force F and said heating body 1 and the ski are driven in relative translation, for example skiing in the direction represented by the arrow 130 relative to a fixed heating body 1. The heating body 1 is maintained at a suitable temperature for melting the thermoplastic material 6, 7 introduced into the extrusion conduits 4 and 5, the filler material being gradually softened in the heating body and conveyed in liquid form under the heating body, and distributed in the transverse distribution groove 9. The flat bottom face 8 of the heating body 1 ensures on the one hand the preheating of the sole part 12 located upstream under the anterior zone 10, then the crushing and spreading of the filler material by the spreading zone 25. At the end of the spreading zone 25, the thermoplastic filler material, still in viscous form, is removed under pressure by the transverse scraper 14. During operation, the scraper 14 is in sliding support on the lower edges 22 and 23 of the ski. Good results are obtained by using a lower face 8 of the heating body 1, the total length of which is between approximately 90 and 110 mm, so that the preheating of the sole to be molded is sufficient.

La position relative de la face inférieure 8 du corps de chauffe 1 et de la semelle 12 du ski doit avantageusement être maintenue constante pendant l'opération de surmoulage. De préférence, la face inférieure 8 doit être légèrement décollée de la semelle à surmouler 12 du ski, de sorte que le seul contact avec la semelle est assuré par le racloir. Pour cela, on prévoit un rouleau 26 antérieur, monté fou sur un axe transversal 27 solidaire des moyens de fixation non représentés du corps de chauffe 1, tel que l'extrémité antérieure 28 de la face inférieure 8 est séparée de la semelle 12 de ski par un espace E avantageusement compris entre 1 et 3 mm, par exemple 2 mm. L'espace E permet d'éviter que la surface à surmouler vienne au contact de parties de la face inférieure de chauffe 8, en fonction des cambrures du ski, ce qui, en réduisant la force F, perturberait l'efficacité du racloir 14.The relative position of the underside 8 of the heating body 1 and the sole 12 of the ski must advantageously be kept constant during the molding operation. Preferably, the lower face 8 must be slightly detached from the sole to be molded 12 from the ski, so that the only contact with the sole is ensured by the scraper. For this, an anterior roller 26 is provided, mounted idly on a transverse axis 27 integral with the not shown fixing means of the heating body 1, such that the anterior end 28 of the lower face 8 is separated from the ski sole 12 by a space E advantageously between 1 and 3 mm, for example 2 mm. Space E prevents the surface to be molded from coming into contact with parts of the lower heating face 8, as a function of the camber of the ski, which, by reducing the force F, would disturb the effectiveness of the scraper 14.

Dans le cas d'un appareil actionné à la main, le rouleau 26 peut avantageusement être motorisé.In the case of a device actuated by hand, the roller 26 can advantageously be motorized.

On constate que, en utilisant le procédé et le dispositif selon l'invention, on réalise un surmoulage sélectif par apport de matériau thermoplastique dans les zones creuses de la semelle 12 à surmouler, zones qui ont été représentées sous les références 19 et 20 sur la figure 1, alors que les zones planes telles que la zone 21 de la semelle 12 ne retiennent pratiquement pas de matière de surmoulage. Dans les zones creuses 19 et 20, après refroidissement, le matériau thermoplastique d'apport forme une légère surépaisseur au dessus de la surface généralement plane de la semelle 12. Il suffit alors, par un léger raclage, ponçage ou meulage ultérieur, de réduire la surépaisseur et on obtient ainsi une surface de semelle régulière dans laquelle le matériau d'apport thermoplastique est limité aux seules zones creuses nécessitant une réparation.It can be seen that, using the method and the device according to the invention, a selective overmolding is carried out by adding thermoplastic material in the hollow zones of the sole 12 to be overmolded, zones which have been shown under the references 19 and 20 on the Figure 1, while the flat areas such as the area 21 of the sole 12 retain practically no molding material. In the hollow zones 19 and 20, after cooling, the thermoplastic filler material forms a slight excess thickness above the generally flat surface of the sole 12. It is then enough, by a light scraping, sanding or subsequent grinding, to reduce the overthickness and a regular sole surface is thus obtained in which the thermoplastic filler material is limited to only the hollow areas requiring repair.

On a obtenu de bons résultats notamment avec un polyéthylène d'apport vendu dans le commerce sous la marque LAFIX. D'autres matériaux peuvent toutefois être utilisés, et conduire à des résultats satisfaisants, c'est-à-dire un surmoulage sélectif en surépaisseur dans les zones creuses de semelles.Good results have been obtained in particular with a filler polyethylene sold commercially under the brand LAFIX. Other materials can however be used, and lead to satisfactory results, that is to say a selective overmolding in excess thickness in the hollow areas of the soles.

On constate également, en utilisant le procédé de la présente invention, que les zones planes 21 de la semelle 12, constituées d'un polyéthylène à très haut poids moléculaire, ne sont pas dégradées par la chaleur apportée par le corps de chauffe 1 ou le matériau de surmoulage lors de leur passage, et conservent leurs propriétés supérieures de glisse. En effet, le procédé de l'invention évite de superposer un film chaud de matériau d'apport sur les zones planes 21 de la semelle 12, film qui échauffe la semelle par conduction et lui fait perdre les propriétés propres au polyéthylène fritté.It is also noted, using the method of the present invention, that the flat areas 21 of the sole 12, made of a very high molecular weight polyethylene, are not degraded by the heat provided by the heating body 1 or the overmolding material during their passage, and retain their superior sliding properties. Indeed, the method of the invention avoids superimposing a hot film of filler material on the flat areas 21 of the sole 12, a film which heats the sole by conduction and makes it lose the properties specific to sintered polyethylene.

Sur la figure 3, on a représenté une vue générale d'un mode de réalisation avantageux de dispositif selon l'invention. Le dispositif comprend un bâti fixe 100 portant la tête de surmoulage. Des moyens d'entraînement sont prévus pour entraîner le ski 12 en translation longitudinale.In Figure 3, there is shown a general view of an advantageous embodiment of the device according to the invention. The device comprises a fixed frame 100 carrying the overmolding head. Drive means are provided for driving the ski 12 in longitudinal translation.

Le corps de chauffe 1 est monté oscillant sur l'axe transversal 101 d'un bras support 104 pivotant sur un axe 105 fixé au bâti 100, tandis que le ski 12 est entraîné en translation par des moyens supports 30 et 102 dans un sens préférentiel représenté par la flèche 130. Les mouvements de pivotement sont représentés par la double flèche 106 et permettent de rapprocher et d'éloigner la tête de surmoulage 1 par rapport à un rouleau entraîneur. Dans la description et les revendications, la direction de déplacement relatif 130 du ski 12 définit la direction longitudinale ; la direction transversale est une horizontale perpendiculaire à la direction longitudinale. Les moyens supports comprennent un enjambeur 30, solidaire du ski 12, et sollicité par un rouleau entraîneur 102 monté en rotation selon un arbre transversal 103 motorisé. L'arbre de rotation 103 du rouleau entraîneur 102 est disposé sensiblement selon un plan transversal vertical I-I passant par le milieu de la tête de surmoulage 1. L'ensemble formé par l'enjambeur 30 et le ski 12 est inséré en translation entre le rouleau entraîneur 102 et la tête de surmoulage 1. La tête de surmoulage 1 est en appui sur la surface de glisse 61 du ski, tandis que le rouleau entraîneur 102 est en appui sur la face extérieure plane ou crantée 29 de l'enjambeur 30.The heating body 1 is mounted oscillating on the transverse axis 101 of a support arm 104 pivoting on an axis 105 fixed to the frame 100, while the ski 12 is driven in translation by support means 30 and 102 in a preferential direction represented by the arrow 130. The pivoting movements are represented by the double arrow 106 and make it possible to move the molding head 1 closer and further away from a driving roller. In the description and the claims, the direction of relative movement 130 of the ski 12 defines the longitudinal direction; the transverse direction is a horizontal perpendicular to the longitudinal direction. The support means comprise a straddle 30, integral with the ski 12, and biased by a driving roller 102 mounted in rotation according to a motorized transverse shaft 103. The rotation shaft 103 of the driving roller 102 is disposed substantially along a vertical transverse plane II passing through the middle of the overmolding head 1. The assembly formed by the straddle member 30 and the ski 12 is inserted in translation between the roller driver 102 and the overmolding head 1. The overmolding head 1 is supported on the sliding surface 61 of the ski, while the driving roller 102 is supported on the flat or notched outer face 29 of the straddle 30.

Le maintien du ski 12 et de l'enjambeur 30 lors de leur passage entre le rouleau entraîneur 102 et la tête de surmoulage 1 peut être complété par un galet support amont 114 et un galet support aval 115, disposés respectivement en amont et en aval de la tête de surmoulage comme le représente la figure, et tourillonnant respectivement sur des axes transversaux horizontaux portés par le bâti 100. Les galets supports 114 et 115 sont disposés selon un plan sensiblement horizontal passant par la génératrice de contact du rouleau entraîneur 102.Maintaining the ski 12 and the straddle 30 during their passage between the driving roller 102 and the overmolding head 1 can be supplemented by an upstream support roller 114 and a downstream support roller 115, disposed respectively upstream and downstream of the overmolding head as shown in the figure, and journalling respectively on horizontal transverse axes carried by the frame 100. The support rollers 114 and 115 are arranged in a substantially horizontal plane passing through the contact generator of the driving roller 102.

Le rouleau entraîneur 102 est sollicité en rotation, selon le sens représenté par la flèche 107, par un moteur non représenté sur les figures. Le bras presseur 104 est sollicité par un ressort ou un vérin tel qu'un vérin à gaz, non représenté sur les figures, appliquant la tête de surmoulage 1 contre la face de glisse 61 du ski monté sur l'enjambeur 30 en direction du rouleau entraîneur 102.The driving roller 102 is rotated, in the direction shown by the arrow 107, by a motor not shown in the figures. The pressing arm 104 is biased by a spring or a jack such as a gas jack, not shown in the figures, applying the overmolding head 1 against the sliding face 61 of the ski mounted on the straddle 30 in the direction of the roller. coach 102.

Dans le mode de réalisation représenté sur les figures 3 à 8, l'enjambeur 30 est conformé pour compenser les irrégularités naturelles de forme du ski 12. L'enjambeur 30 doit s'adapter à la forme des skis traditionnels, qui comportent un corps de ski 60 allongé et de forme aplatie, limité par la face de glisse 61, par la face supérieure 62 et par deux chants latéraux. L'extrémité avant du corps 60 est recourbée vers le haut pour former une spatule 63, et son extrémité arrière est légèrement recourbée vers le haut pour former un talon 64. Le corps 60 présente une épaisseur variable en fonction de la position longitudinale considérée le long du ski, l'épaisseur étant plus importante en partie centrale du corps 60 qu'au voisinage des extrémités du ski. La face supérieure 62 reçoit les fixations 65 et 66 permettant l'adaptation et le maintien d'une chaussure de ski, lors de l'utilisation du ski sur neige. Le corps 60 est cambré, de sorte que, lorsque le ski est posé sur un plan selon sa face inférieure de glisse 61, il repose selon deux lignes situées au voisinage des extrémités du ski, la partie centrale de la face 61 de glisse étant surélevée par rapport au plan support.In the embodiment shown in Figures 3 to 8, the straddle 30 is shaped to compensate for natural irregularities in the shape of the ski 12. The straddle 30 must adapt to the shape of traditional skis, which have a body of ski 60 elongated and flattened, limited by the sliding face 61, by the upper face 62 and by two side edges. The front end of the body 60 is bent upwards to form a spatula 63, and its rear end is slightly bent upwards to form a heel 64. The body 60 has a variable thickness depending on the longitudinal position considered along of the ski, the thickness being greater in the central part of the body 60 than in the vicinity of the ends of the ski. The upper face 62 receives the bindings 65 and 66 allowing the adaptation and the maintenance of a ski boot, when using the ski on snow. The body 60 is arched, so that, when the ski is placed on a plane along its lower sliding face 61, it rests along two lines located in the vicinity of the ends of the ski, the central part of the sliding face 61 being raised with respect to the support plane.

Pour s'adapter à ces formes particulières, l'enjambeur 30 comprend une poutre longitudinale rectiligne 34 à section générale en U, sa face extérieure 35 recevant une bande de roulement crantée 36. La poutre 34 porte des cales coulissantes telles que la cale 37. On peut par exemple prévoir une cale 37 qui sera disposée au voisinage de la fixation avant 65, une cale 38 disposée en avant de la cale 37, deux cales 39 et 40 au voisinage de l'extrémité arrière de la poutre 34. Les cales peuvent être réglées en position longitudinale le long de la poutre 34 par coulissement, par exemple selon une structure schématiquement représentée sur la figure 5 en coupe transversale. Les cales 37, 38, 39 et 40 ont des hauteurs réglables, et choisies de telle manière que, lorsque le ski est en position de surmoulage telle que le représente la figure 3, les cales compensent la cambrure du ski et tendent à rendre sa face de glisse 61 à surmouler sensiblement plane et parallèle à la surface extérieure 35 de la poutre 34.To adapt to these particular shapes, the straddle member 30 comprises a rectilinear longitudinal beam 34 with a general U-shaped section, its outer face 35 receiving a notched tread 36. The beam 34 carries sliding wedges such as the wedge 37. One can for example provide a shim 37 which will be disposed in the vicinity of the front attachment 65, a shim 38 disposed in front of the shim 37, two shims 39 and 40 in the vicinity of the rear end of the beam 34. The shims can be adjusted in longitudinal position along the beam 34 by sliding, for example according to a structure schematically shown in Figure 5 in cross section. The shims 37, 38, 39 and 40 have adjustable heights, and chosen in such a way that, when the ski is in the overmolding position as shown in FIG. 3, the shims compensate for the camber of the ski and tend to make its face sliding 61 to be overmolded substantially planar and parallel to the outer surface 35 of the beam 34.

Divers moyens peuvent être utilisés pour assurer la solidarisation du ski 12 et de l'enjambeur 30 l'un par rapport à l'autre. Dans le mode de réalisation représenté sur les figures 4 à 7, la solidarisation est assurée par des moyens 43 de solidarisation de la spatule 63, des moyens 44 de solidarisation du talon 64, et des moyens de solidarisation d'une partie intermédiaire du corps de ski.Various means can be used to secure the ski 12 and the straddle 30 relative to each other. In the embodiment shown in FIGS. 4 to 7, the attachment is provided by means 43 for attaching the tip 63, means 44 for attaching the heel 64, and means for attaching an intermediate part of the body of ski.

La solidarisation de la partie intermédiaire du corps de ski peut avantageusement être assurée par la cale intermédiaire 37, conformée pour venir s'encastrer sous les ailes de la fixation antérieure 65 du ski. Un tel encastrement empêche que l'on puisse séparer le ski 12 et l'enjambeur 30 par un simple mouvement de translation perpendiculaire à la surface de glisse du ski. On peut ainsi manipuler l'ensemble ski-enjambeur par le seul ski, sans risque de voir le ski se décrocher de l'enjambeur.The attachment of the intermediate part of the ski body can advantageously be ensured by the intermediate wedge 37, shaped to come under the wings of the front binding 65 of the ski. Such embedding prevents that one can separate the ski 12 and the straddle 30 by a simple translational movement perpendicular to the sliding surface of the ski. It is thus possible to manipulate the ski-straddle assembly by the single ski, without the risk of seeing the ski unhook from the straddle.

Le moyen de solidarisation 43 de spatule comprend une entretoise de maintien 46 transversale reliant deux flasques latéraux d'appui 45 conformés sensiblement au profil de la spatule 63 et munis de patins 48 et 49. Les patins et les flasques sont solidaires de la poutre 34 et disposés, comme le représentent les figures, de telle manière que la spatule 63 puisse être engagée entre les flasques 45 et l'entretoise de maintien 46 et que, lorsque la spatule est ainsi engagée et que l'on abaisse le talon du ski comme le représente la flèche 47 de la figure 6, la spatule 63 se trouve coincée par appui sur la face supérieure des patins 48 et 49 et immobilisée sous la face inférieure de l'entretoise de maintien 46. Les flasques d'appui 45 sont avantageusement munis de patins souples 48 et 49 formant appui souple et élastique pour la face correspondante de spatule 63.The attachment means 43 of the spatula comprises a transverse retaining spacer 46 connecting two lateral support flanges 45 substantially shaped to the profile of the spatula 63 and provided with pads 48 and 49. The pads and the flanges are integral with the beam 34 and arranged, as shown in the figures, in such a way that the tip 63 can be engaged between the flanges 45 and the retaining spacer 46 and that, when the tip is thus engaged and the ski heel is lowered as the represents the arrow 47 of FIG. 6, the spatula 63 is wedged by pressing on the upper face of the pads 48 and 49 and immobilized under the lower face of the retaining spacer 46. The support flanges 45 are advantageously provided with flexible pads 48 and 49 forming a flexible and elastic support for the corresponding face of the spatula 63.

Le moyen 44 de solidarisation du talon 64, mieux représenté sur la figure 8, comprend une butée arrière 53 enveloppante, comportant une partie dépassante 54 sous laquelle vient s'engager une courte longueur du talon 64. La butée arrière 53 est arrondie pour former une rampe d'acheminement progressif de la tête de surmoulage sur le ski. La courbure de cette butée 53 doit être adaptée pour que le patin de surmoulage 1 seul soit en appui, sans que la lame du racloir ne vienne en appui sur cette butée. Un tel appui pourrait en effet détériorer la lame. Une tôle mince 55 est superposée à la forme arrondie de la butée postérieure 53. La tôle 55 a un double rôle : elle essuie tout d'abord l'écoulement initial de polyéthylène sortant de la tête de surmoulage ; cet écoulement initial comprend généralement du polyéthylène relativement carbonisé et impropre au surmoulage, le matériau qui le constitue ayant stationné en attente dans le corps de chauffe et ayant été surchauffé pendant les interruptions de cycle. La tôle 55 mince, par exemple en cuivre, permet également le bon raccordement de la semelle de surmoulage avec différentes formes de talons de ski, favorisant en se déformant légèrement un démarrage net du surmoulage en talon. La butée postérieure 53 est mobile longitudinalement comme le représente la double flèche 56, pour la mise en place du dispositif : lorsque le ski 12 est en place, le talon 64 étant en position, on avance la butée 53 pour que son avancée 54 vienne recouvrir partiellement le talon 64. La cale intermédiaire 40, réglable en position longitudinale et réglable en hauteur, permet, en coopération avec la butée postérieure 53, un bon blocage du talon 64.The means 44 for securing the heel 64, better represented in FIG. 8, comprises an enveloping rear stop 53, comprising a projecting part 54 under which a short length of the heel 64 engages. The rear stop 53 is rounded to form a progressive routing ramp of the overmolding head on the ski. The curvature of this stop 53 must be adapted so that the overmoulding shoe 1 alone is in support, without the scraper blade coming to bear on this stop. Such support could indeed damage the blade. A thin sheet 55 is superimposed on the rounded shape of the rear stop 53. The sheet 55 has a double role: it firstly wipes the initial flow of polyethylene leaving the overmolding head; this initial flow generally comprises relatively carbonized polyethylene which is unsuitable for overmolding, the material of which it is made having parked in standby in the heating body and having been overheated during cycle interruptions. The thin sheet 55, for example of copper, also allows good connection of the molding sole with different shapes of ski heels, favoring by deforming slightly a clean start of the molding in the heel. The rear stop 53 is movable longitudinally as shown by the double arrow 56, for the installation of the device: when the ski 12 is in place, the heel 64 being in position, the stop 53 is advanced so that its projection 54 partially covers the heel 64. The intermediate wedge 40, adjustable in longitudinal position and adjustable in height, makes it possible, in cooperation with the stop posterior 53, good blocking of the heel 64.

Le ski 12 et l'enjambeur 30 forment ainsi un ensemble monobloc, le ski étant plaqué contre l'enjambeur pendant l'introduction entre le rouleau entraîneur 102 et la tête de surmoulage 1, talon en avant, dans le sens longitudinal représenté par la flèche 130. La rotation du rouleau 102, dans le sens représenté par la flèche 107, entraîne l'ensemble formé par le ski 12 et l'enjambeur 30 à une vitesse de translation régulière appropriée, la surface de glisse 61 du ski étant en appui sur le patin de chauffe et d'étalage, le rouleau entraîneur 102 étant en appui sur la face extérieure 29 de l'entraîneur. Le rouleau entraîneur 102 peut avantageusement être muni, à sa périphérie, de crans transversaux complémentaires des crans de la bande de roulement 36. On évite ainsi les glissements entre le rouleau entraîneur 102 et l'enjambeur 30, de sorte que l'enjambeur est entraîné à vitesse régulière.The ski 12 and the straddle member 30 thus form a one-piece assembly, the ski being pressed against the straddle member during the introduction between the driving roller 102 and the overmolding head 1, heel forward, in the longitudinal direction represented by the arrow 130. The rotation of the roller 102, in the direction represented by the arrow 107, drives the assembly formed by the ski 12 and the straddle member 30 at an appropriate regular translation speed, the sliding surface 61 of the ski being supported on the heating and spreading pad, the driving roller 102 being in abutment on the outer face 29 of the coach. The driving roller 102 can advantageously be provided, at its periphery, with transverse notches complementary to the notches of the tread 36. This avoids slipping between the driving roller 102 and the straddle 30, so that the straddle is driven at regular speed.

Le dispositif à enjambeur selon l'invention présente également l'intérêt de faciliter le traitement ultérieur du ski après surmoulage. En effet, le ski est généralement acheminé, après surmoulage, vers une ponceuse à bande abrasive ou à pierre. Les ponceuses les plus modernes disposent d'un entraîneur automatique. L'enjambeur est adapté pour passer également dans de tels entraîneurs. Il en résulte qu'il n'est alors plus nécessaire de déplacer le ski d'un poste de travail à l'autre, et l'on peut prévoir un dispositif comprenant une tête de surmoulage suivie d'une ponceuse, les deux opérations étant effectuées l'une à la suite de l'autre par une seule translation de l'enjambeur et du ski.The straddle device according to the invention also has the advantage of facilitating the subsequent treatment of the ski after overmolding. In fact, the ski is generally routed, after overmolding, to an abrasive belt or stone sander. The most modern sanders have an automatic drive. The straddle is adapted to also pass in such coaches. As a result, it is no longer necessary to move the ski from one workstation to another, and one can provide a device comprising a molding head followed by a sander, the two operations being carried out one after the other by a single translation of the straddle and the ski.

Selon un mode de réalisation avantageux, le dispositif de l'invention comprend en outre des moyens de réglage de vitesse du moteur d'entraînement du matériau d'apport solide pour son introduction dans le corps de chauffe 1, associés à des moyens de réglage de la force d'appui F. Le réglage peut être simultané par un seul organe de commande. Ces moyens permettent, en augmentant le débit du matériau d'apport, par exemple d'environ 50 %, et en réduisant simultanément la force d'appui F, par exemple en la fixant à 150 Newton environ, de réduire sensiblement l'effet de chasse du racloir 14 et de déposer plus de matériau d'apport sur le ski. Ce réglage peut s'avérer utile lorsque le talon et la spatule du ski sont concaves, le surmoulage complet permettant alors de recharger cette concavité et de restituer une semelle réglée.According to an advantageous embodiment, the device of the invention further comprises means for adjusting the speed of the motor driving the solid filler material for its introduction into the heating body 1, associated with means for adjusting the the pressing force F. The adjustment can be simultaneous by a single control member. These means make it possible, by increasing the flow rate of the filler material, for example by approximately 50%, and simultaneously reducing the bearing force F, for example by setting it at around 150 Newton, to significantly reduce the hunting effect of the scraper 14 and to deposit more filler material on the ski. This adjustment can be useful when the heel and the tip of the ski are concave, the complete overmolding then making it possible to reload this concavity and restore a regulated sole.

Claims (22)

1 - Method of over-molding a ski sole (12) by sweeping, in which :
- a thermoplastic filling material (6, 7) is continuously fed in solid form into a heating body formed as a spreader shoe (1), the filling material (6, 7) being progressively softened in the body (1) and brought in liquid form to and distributed in a transverse groove under the shoe, then for being crushed and spread over the ski sole (12), the spreader shoe being moved with respect to the ski surface at a sweeping speed V,
characterized in that :
- downstream of the distribution and spreading zone (25), the thermoplastic material still in liquid or at least viscous form is driven under pressure by a transverse scraper (14).
2 - Method according to claim 1, characterized in that the transverse scraper (14) comprises a blade brought to the temperature of the spreader shoe (1) and fast with the spreader shoe (1).
3 - Method according to one of claims 1 or 2, characterized in that, during the sweeping movement, the transverse scraper (14) bears slidingly on the edges (22, 23) of the ski.
4 - Method according to one of claims 1 to 3, characterized in that the scraper (14) comprises a sharp transverse substantially rectilinear edge (16) separating a front scraper face (17) and a rear scraper face (24), the front scraper face (17) being held slanted with respect to the ski sole so as to form a corner whose opening angle B is kept substantially constant and between about 75° and 45° so as to avoid the chattering phenomena and to produce a good driving effect.
5 - Method according to claim 4, characterized in that :
- a given bearing force F is applied to the spreader shoe (1) in the direction of the ski sole (12) and substantially vertically from the spreading zone (25),
- the sharp scraper edge (16) projects below the spreader shoe surface (1) with a projection D between about 2 and 4 tenths of a millimeter,
- the speed V is between about 3 and 4 meters per minute,
- the bearing force F is between 200 and 500 Newtons.
6 - Method according to claim 5, characterized in that angle B is between 65 and 55°.
7 - Method according to one of claims 5 or 6, characterized in that the bearing force F is between 200 and 250 Newtons.
8 - Device for over-molding a ski sole by sweeping for implementing the method according to claim 1, comprising means for supplying thermoplastic filling material, a heating and spreader shoe (1) formed so as to receive the filling material in solid form (6, 7), for heating it and progressively softening it, for bringing it in liquid form under a distribution and spreading structure (1, 9, 25) intended to be pressed against the ski sole (12) and driven in relative longitudinal translation over said ski sole in a preferential propagation direction (13), the shoe (1) comprising :
- a generally flat lower distribution surface (8), comprising a front zone (10) for pre-heating the ski sole, followed by a transverse distribution groove (9) into which the molten filling material is fed, itself followed by a spreading zone (25),
characterized in that it comprises :
- downstream of the distribution (9) and spreading (25) zone, a transverse scraper (14) for scraping the filling material still in liquid or at least viscous form over the ski sole (12).
9 - Device according to claim 8, characterized in that the transverse scraper (14) is subjected to the action of heating means bringing it to a temperature at least equal to the softening temperature of the filling material.
10 - Device according to one of claims 8 or 9, characterized in that the scraper comprises a substantially rectilinear transverse sharp lower edge (16) projecting below the distribution (8) and spreading surface of the shoe and separating a front scraper face (17) and a rear scraper face (24), the scraper being fast with the spreader shoe.
11 - Device according to claim 10, characterized in that :
- the lower edge (16) projects by a height D between two and four tenths of a millimeter,
- the front scraper face (17) forms, with the distribution (8) and spreading surface of the shoe, an angle A between one hundred and five and one hundred and thirty-five degrees, preferably between about one hundred and fifteen and one hundred and twenty-five degrees.
12 - Device according to one of claims 8 to 11, characterized in that :
- the spreader shoe (1) is heated by electric resistances distributed in its central part and conferring on said central part a temperature between 320 and 340° C,
- the distribution surface (8) has a length between 90 and 110 mm.
13 - Device according to any one of claims 8 to 12, characterized in that the transverse distribution groove (9) is closed at both ends and has a length between 90 and 100 mm, a width between 4 and 7 mm and a depth between 2 and 3.5 mm.
14 - Device according to claim 13, characterized in that the transverse groove (9) has substantially the dimensions : length 95 mm, width 6 mm, depth 3 mm.
15 - Device according to any one of claims 8 to 14, characterized in that it comprises a front roller (26) mounted on a transverse shaft (27) fast with the heating body (1) and disposed so as to maintain a constant space E between the front end (28) of the lower face (8) and the surface (12) to be over-molded.
16 - Device according to any one of claims 8 to 15, characterized in that the spreader shoe (1) is associated with a fixed frame structure (100) comprising means for supporting the spreader shoe (1) and the ski (12) to be over-molded, means (102, 30) for driving the spreader shoe (1) and the ski (12) in relative longitudinal translation, and means (104) for maintaining the spreader shoe (1) applied with a given force F against the ski sole (12) during the longitudinal translational movement, the bearing force F being between 200 and 500 Newtons, the translational speed being between 3 and 4 meters per minute.
17 - Device according to claim 16, characterized in that it comprises a ski support (30) and in that :
- the ski support (30) is movable and driven in longitudinal translation over the frame (100),
- the ski support (30) comprises a removable straddle carrier comprising a rectilinear beam (34) associated with wedges (37, 38, 39, 40) and means (43, 44) for fixing to the ski,
- the rectilinear beam (34) forms a bearing surface (35), opposite the ski surface to be machined (61) and over which rolls a drive roller (102) driven by a motor,
- presser means (104) produce an appropriate pressure of the over-molding head (1) for maintaining the ski (12) on the beam (34) in abutment against the drive roller (102).
18 - Device according to claim 17, characterized in that the wedges (37, 38, 39, 40) have different lengths and are chosen so that they compensate for the camber of the ski and tend to make the sliding surface (61) of the ski flat during its passage through the device.
19 - Device according to any one of claims 17 or 18, characterized in that the bearing surface (35) of the straddle carrier comprises notches (36) cooperating with the corresponding external notched surface of the drive roller (102).
20 - Device according to any one of claims 17 to 19, characterized in that the presser means are springs or gas-driven jack producing a force of about 250 Newtons.
21 - Device according to any one of claims 17 to 20, characterized in that the straddle carrier comprises a device (43) for locking the tip (63), a device (44) for locking the heel (64), and means (37) for locking the ski in an intermediate zone.
22 - Device according to any one of claims 16 to 21, characterized in that it comprises :
- means for adjusting the speed of the solid filling material supply means, permitting a speed increase of about 50 %,
- means for adjusting the bearing force F permitting a reduction of the force to about 150 Newtons, so as to make it possible to carry out at will, using the same device, selective over-molding in damaged zones and complete over-molding in the concave zones of the ski sole (12).
EP89420366A 1988-09-29 1989-09-26 Method and apparatus for waxing skis Expired - Lifetime EP0367684B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89420366T ATE72764T1 (en) 1988-09-29 1989-09-26 SKI WAXING METHOD AND APPARATUS.

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
FR8813137 1988-09-29
FR8813137A FR2636881B1 (en) 1988-09-29 1988-09-29 METHOD AND DEVICE FOR OVER-MOLDING SKI SOLE
FR8813998 1988-10-11
FR8813998A FR2637509B1 (en) 1988-10-11 1988-10-11 DEVICE FOR REMOVING EXCESS MATERIAL FROM A SKI SOLE
FR8903264A FR2643852B2 (en) 1988-09-29 1989-03-03 METHOD AND DEVICE FOR OVER-MOLDING SKI SOLE
FR8903264 1989-03-03

Publications (3)

Publication Number Publication Date
EP0367684A2 EP0367684A2 (en) 1990-05-09
EP0367684A3 EP0367684A3 (en) 1990-05-16
EP0367684B1 true EP0367684B1 (en) 1992-02-26

Family

ID=27251704

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89420366A Expired - Lifetime EP0367684B1 (en) 1988-09-29 1989-09-26 Method and apparatus for waxing skis

Country Status (5)

Country Link
US (1) US4999224A (en)
EP (1) EP0367684B1 (en)
JP (1) JPH02144003A (en)
DE (1) DE68900873D1 (en)
ES (1) ES2030588T3 (en)

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Publication number Priority date Publication date Assignee Title
EP1952858A1 (en) 2007-01-30 2008-08-06 Wintersteiger AG Device for treating the base of a ski

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FR2668942B1 (en) * 1990-11-09 1993-02-05 Chatanay Pierre SKIS RESOLATING MACHINE.
US5544908A (en) * 1994-05-06 1996-08-13 K-2 Corporation Thermoplastic composite ski and method of manufacture
FR2790399B1 (en) 1999-03-05 2001-04-27 Skid Sa DEVICE FOR REMOVING SURPLUS OF OVER-MOLDING OF SKIS OR SNOWBOARDS
FR2805755B1 (en) 2000-03-03 2002-11-22 Skid Sa SIDE DRIVE SKIS TREATMENT MACHINE
US8448276B2 (en) * 2009-08-19 2013-05-28 Michael Carroll Wax, scraper and buffer combination device for tuning skis and snowboards
KR101246166B1 (en) * 2011-03-08 2013-03-21 주식회사 탑 엔지니어링 Dispensing nozzle for liquid crystal
JP7005088B1 (en) * 2020-08-04 2022-02-14 株式会社成光工業 Wax application device

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US2404582A (en) * 1944-02-09 1946-07-23 Firestone Tire & Rubber Co Apparatus for making sheet material
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DE2164596A1 (en) * 1971-12-24 1973-06-28 Reichmann & Sohn BELT SANDING MACHINE FOR GRINDING THE RUNNING SURFACE OF SKIS
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1952858A1 (en) 2007-01-30 2008-08-06 Wintersteiger AG Device for treating the base of a ski

Also Published As

Publication number Publication date
EP0367684A2 (en) 1990-05-09
EP0367684A3 (en) 1990-05-16
US4999224A (en) 1991-03-12
ES2030588T3 (en) 1992-11-01
JPH02144003A (en) 1990-06-01
DE68900873D1 (en) 1992-04-02

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