FR2730824A1 - SUPPORT PLATE FOR GLASSES FRAME - Google Patents

Abstract

A supporting pad for a spectacles frame, consisting of a pad (15) made of a thin plastic sheet (16) defining an internal space and attached to a backing (12) of rigid material. The space is filled with a gel or a colloidal material (18), and the outer sheet (16) is stretchable by at least 200 %. Said space is preferably filled with liquid silicone or a hypoallergenic silicone gel having a penetrability of more than 100. The supporting pad may be used as a nose pad, a forehead-engaging pad or a temple end-mounted pad.

Description

SUPPORT PLATE FOR GLASSES FRAME
The present invention relates to a support plate for spectacle frame, that is to say an assembly consisting of a rigid support frame for an anatomical pad coming into contact with a part of the head of the user. . The invention relates in particular to a nose pad, the pad of which is liable to deform under the weight of the frame in order to best conform to the anatomy of the local part of the nose in contact.

 We know nose pads whose pad is made of plastic, rubber foam or molded silicone relatively flexible so as not to strike the part of the nose, but rigid enough to keep their shape permanently. Such plates are for example described in documents EP 0 280 855, FR 2 631 464, FR 2 538 568.

However, these materials nevertheless remain too rigid for the low weight of a spectacle frame to be sufficient to deform them so as to distribute the weight of the frame over a maximum surface. Thus, these materials cause long term marks on the nose, in addition to possible allergies.

 The document FR 2 326 717 describes an ovoid nose pad pad composed of a first external sheet of plastic material with a thickness of the order of 0.1 millimeter and a second internal sheet of rigid plastic material, these two sheets being welded together to enclose between them a volume of fluid, such as air or water, so that this pad can deform under the weight of the spectacle frame.

However, if the welding of the two sheets is not perfectly sealed, even a very small leak causes the fluid trapped in the deflating pad to escape. In the certificate of addition
FR 2 356 964, it is then proposed to split the volume of fluid into several sub-volumes isolated from each other. In fact, we then return to the already known solution of a plastic foam with closed cells whose deformation becomes negligible.

 The aim of the present invention is a support plate for a spectacle frame, the pad of which is flexible enough to deform under the sole weight of the frame, but the choice of materials and the method of manufacture of which ensures better reliability in production time and reasonable cost.

 These goals are achieved by means of a support plate for spectacle frame composed of a pad made of a sheet of thin plastic material, forming an internal volume and fixed on a base of rigid material, because this volume is filled with 'a gel or a colloidal product; and the fact that the outer sheet is stretchable by at least 200%.

 By colloidal product is meant a product having the appearance of a fluid adhesive or a jelly and which cannot pass through a semi-permeable membrane. Such a product can be a gelatin, that is to say an albuminoid substance extracted from animal tissues and subjected to the prolonged action of boiling water; or a gel based on water, oil, glycerin and in which a flocculation of a colloidal solution is carried out.

 According to a preferred embodiment, the pad is filled with a liquid silicone or in a chemically inert gel against the skin with penetrability greater than 100 according to standard NF T77-104. Such a gel can be obtained by crosslinking a two-component silicone elastomer, also called liquid silicone.

 The higher than normal stretching of the outer sheet allows it not to be damaged during an accident, in other words that the pad does not burst even if it is exceptionally crushed.

 Advantageously, a nose pad has an enlarged lower part which forces the deformation of the pad all the better.

 A front support plate can advantageously include a longilinear pad attached to a sweat bar of a spectacle frame. Alternatively, an ear support plate may include a pad attached to a socket in the inner face of the branch sleeve, or a long pad attached to a seat in the inner side and the underlying side of all or part of the branch sleeve.

A preferred embodiment of such a support plate consists in: - superimposing two plastic films which are welded by means of a tool structured so as to form strings of envelopes connected together by channels, - to pour in the rosaries a liquid silicone which fills each of the envelopes, - to crosslink the liquid silicone which turns into gel, - to close by welding the channels and to cut the envelopes thus forming pads.

- to be attached by gluing, if desired with a multi-application glue, the pads against their rigid base.

The invention will be better understood from the study of embodiments taken without any limitation being implied and illustrated in the appended figures in which:
FIGS. 1 a and 1 b are views of a first embodiment of a nose pad according to the invention from the front and from the side,
- Figure îc is a side view of a second embodiment of a nose pad,
- Figure 2 is a front view of a spectacle frame whose right plate (a) is free, and whose left plate (b) is deformed when in contact with the nose
FIGS. 3a and 3b illustrate, in perspective, respectively a third and fourth embodiment of a double nose pad,
FIG. 4 illustrates, in perspective, the right part of a fifth embodiment of a double nose pad,
FIG. 5 illustrates, in perspective, a support plate mounted on a spectacle frame anti-sweat bar, and
- Figures 6a and 6b illustrate, in perspective of the support plates at the sleeve of a spectacle frame branch.

 In FIGS. 1 a and 1 b is illustrated a nose pad 10 constituted by an internal vertical support base 12 on which is fixed a flexible pad 15 containing a semi-liquid product 18 such as a gel.

 As best seen in Figure la, the support base 12 here has an ovoid shape with its swollen part facing downwards.

This base is made of a rigid material. This base 12 can be of natural material such as wood, horn cut from a sheet; or of metal cast by micro-fusion or machined from a profile; or synthetic material such as polycarbonate molded in an injection machine.

Alternatively, a base of synthetic material can be obtained by cutting from a sheet, or by hardening a layer of adhesive, for example, of the type sold under the name araldite. This base 12 may have a flat or slightly concave internal surface to form a cushion socket.

 Against the external face of this base is attached an attachment means 14 such as an eyecup, a clip or a ball joint. This attachment means can be molded in one piece with the base, or be an insert added during molding, or be a piece glued later.

This external face also presents a sufficient surface for a marking of the manufacturer (or the licensee).

 The shape of the support base 12 is preferably widened in its lower part. As an alternative to the ovoid form mentioned above, this base can also be in the form of a bean, or in the form of the number eight with a lower lobe larger than the upper lobe.

 FIGS. 3 illustrate other embodiments of the base support having simultaneously the function of a spectacle frame bridge. In FIG. 3a, the nose bridge comprises, in one piece, a pair of bases 12 "connected by a bridge 13, these bases possibly having a cell for the pads 15. Hooking means 14 are also attached to the outer face of the bases The bridge 13 is semi-rigid so that it can be curved when it is installed on the frame.

 In Figure 3b, the saddle nose has a rigid frame in which the elongated bases 12 "'are in planes substantially perpendicular to the connecting bridge 13. These bases 12"' are curved so as to follow the shape of their bezel circle corresponding. The 15 "bearings also have a slender shape here to enlarge the contact area with the nose as much as possible. A cushion can also be attached to a nose-rest.

 More particularly according to the invention, and as clearly visible in FIGS. 1, the casings 16, 16 'of pad 15, 15' are a thin plastic film with a thickness of the order of 10 to 100 microns, preferably 25 microns. . This 16.16 ′ film is stretchy elastically up to 300% or even 700% before being torn, which gives it great strength in the face of external mechanical attack. For example, this sheet is made of polyurethane which, in contact with the skin, is hypoallergenic and not too slippery. This sheet can be colored or, preferably, translucent to reveal the manufacturer's mark.

 According to a first embodiment illustrated in FIG. 1b, the pad 15 is produced in a complete envelope 16 having the shape of a drop and then stuck in the cell slightly shaped in the corresponding face of the base 12, or directly in a cavity easily produced in a plastic mount, the corresponding part of which has been specially machined or molded. The adhesive of the pad 15 can be of multiple application, that is to say that this pad can be removed and put back several times for exchange, cleaning or other reasons. Other temporary fixing means, such as that sold under the name "Velcro", can also be envisaged.

 According to a second embodiment illustrated in FIG. 1c, the edge of the film constituting the envelope 16 ′ of the pad 15 ′ is fixed by gluing, thermal welding or ultrasonic welding against the edge 17 of the base 12 or on the outer periphery or internal of this base.

The semi-liquid product 18 is preferably a liquid or gel silicone such as one of those described in the review PLASTIQUES FLASH n "273 of July 1994 page 42 to 46. This type of product is particularly suitable for this use, in comparison with other natural or chemical gels, insofar as it can be manufactured in sufficient quantity with stable mechanical and chemical characteristics, unlike known silicone pads capable of retaining their shape due to their semi-hardness, the pads 15, 15 'and 15 "according to the invention have a hardness well below 5 shores, and are then better characterized by their" penetrability "at least greater than 100 as defined by the standard
NF T77-104. In this standard, the consistency of the gel is measured by measuring the penetration of a standardized cone in a sample, a very high value reflecting an almost liquid gel. In this case, a technical gel of penetrability between 100 and 300 is chosen. In addition, this silicone gel retains its elasticity over a very wide thermal range, and it has total physiological harmlessness. This silicone gel is preferably translucent, possibly slightly colored.

 Thus, the pads 15 or 15 'composed of a thin film 16,16' very flexible and containing a semi-liquid product take, under their own weight, a drop shape. Above all, these pads can also take a multitude of forms to more or less match the anatomy of the part of the nose coming into contact with it.

 According to a first embodiment for a wafer illustrated in FIG. 1b, two plastic films 16 are superimposed which are welded along predetermined perimeter lines by heat welding or ultrasonic welding, and this by structured tooling of such so as to form strings of flat envelopes connected together by channels. A technical liquid silicone is then poured into these strings which fills each of the envelopes with an approximately constant quantity. The crosslinking of the silicone can then be accelerated by adding heat, crosslinking transforming the liquid into a gel of desired characteristics. After closing the envelopes, they are finally cut out. Each pad 15 thus produced is finally attached to its base 12.

 As an alternative, one of the plastic films is replaced directly by a network of support bases 12 linked together so that the welding of the second film produces the transfer channels.

 According to another embodiment for the wafer illustrated in FIG. 1c, one or more cells are housed in a matrix. A plastic film is placed on this matrix, then each corresponding portion is pressed to the bottom of a cell. This compliance of the film can be achieved by suction, the bottom of the cells being connected to air exhaust channels. A volume of liquid or gel silicone is poured into each of the cells. This volume is fixed at an exact predetermined value so that the level of the silicone is flush with the level of the plastic film. Each cell containing the silicone is then closed by a base attached by gluing on the periphery or ultrasonic welding. Finally, each plate thus produced is separated from the initial plastic film by cutting.

 As illustrated in FIG. 2, the plate is installed in a conventional manner in a spectacle frame 50 slightly below the bridge joining the two bezel circles 52. For example, an eyelet 14 attached to the rear of the base 12 is engaged in a plate holder 54 protruding from the beverage circle.

 When the glasses are not worn, the envelope 16 deforms under its own weight into a drop as best seen in FIG. 2b. Accidental rubbing of this envelope against an internal wall of a spectacle case cannot damage it insofar as it only deforms momentarily without tearing.

 When the glasses are worn, the silicone gel or liquid rises in the envelope which takes the form of a cushion as illustrated in FIG. 2a, this cushion having a very large contact surface with the nose of the wearer. This contact surface is wider than usual, the weight of the glasses is better distributed in a pressure low enough to give a new feeling of comfort and hardly leave any trace.

 In FIG. 4 is illustrated how the envelope 164 can itself have the complete shape of a bridge nose, namely consisting of two lateral pads 154 connected together by a channel bridge 134, this bridge nose resting entirely on the wearer's nose. The contact surface is then maximum. This overall envelope 164 is held by two bases 124 of identical lateral supports and attached at the level of each of the pads 154.

 As a variant, the nasal support plate described above can be easily modified in shape and dimensions to be transformed into a support plate for the sleeve of the branches at the level of the ears, or an anti-sweat bar at the level of the forehead.

 For example, FIG. 5 illustrates in perspective how an elongated pad 155 can be attached to the internal face of a sweat bar 125, this pad bearing on the forehead of the wearer.

 FIG. 6a illustrates a pad 156 attached to the internal face of the sleeve 126 of the spectacle frame branch, if desired within a cell 136. FIG. 6b illustrates a larger pad 157 covering the internal face and the underside face. adjacent to all or part of the sleeve 127 of the branch.

 The nose pads of Figure 3b are rather intended for metal frames while the support pads at the ears of Figures 6a or 6b also apply to metal frames in plastic cut or injected.

 Many improvements can be made to this attachment within the scope of the claims.

Claims (8)

1. Support plate for spectacle frame composed of a pad (15) made of a thin plastic sheet (16), forming an internal volume and fixed on a base (12) of rigid material, characterized in that this volume is filled with a gel or a colloidal product (18); and in that the outer sheet (16) is stretchable by at least 200%. 2. Plate according to claim 1, characterized in that the volume is filled with a liquid silicone or anallergic gel with penetration greater than 100. 3. Nasal support plate according to claim 1 or 2, characterized in that it has an enlarged lower part. 4. Front support plate according to claim 1 or 2, characterized in that the pad (155) of elongate shape is attached to a sweat bar (125) constituting its rigid base. 5. Ear support plate according to claim 1 or 2, characterized in that the pad (156) is attached in a cell formed in the internal face of the sleeve (126) of branch constituting its rigid base. 6. Ear support plate according to claim 1 or 2, characterized in that the elongate pad (157) is attached in a seat formed in the internal face and the underlying face of all or part of the sleeve (127) of branch constituting its rigid base. 7. A method of producing a support according to claim 2, characterized in that it consists in: - superimposing two plastic films which are welded by means of a tool structured so as to form strings of envelopes interconnected by channels, - pouring into the rosaries a liquid silicone which fills each of the envelopes, - crosslinking the liquid silicone which turns into gel, - sealing the channels and cutting the envelopes thus forming pads. - to be attached by gluing, if desired with a multi-application glue, the pads against their rigid base.  8. A method of producing a support according to claim 1 characterized in that it consists in: - providing one or more cells in a matrix, - placing a plastic film on this matrix, and pressing each corresponding portion at the bottom of a cell, - pour a predetermined volume of liquid or gel silicone into each of the cells, - to close each cell by a base added by gluing or welding, - to separate each wafer thus produced from the plastic film by cutting.