FR2507160A1 - CLOSING DEVICE FOR BOTTLES - Google Patents

Abstract

A CLOSING DEVICE FOR BOTTLES CONSISTING OF A HOLLOW ELEMENT 1 IN PLASTIC MATERIAL PROVIDED ON ITS CIRCULAR INTERNAL SIDE FACE WITH MEANS 3, SUCH AS A THREAD, FOR FIXING ON THE NECK OF A BOTTLE. B. DEVICE CHARACTERIZED IN THAT THE BOTTOM INTERNAL FACE 2 OF THE HOLLOW ELEMENT IS PROVIDED WITH TWO COAXIAL CIRCULAR SKIRTS 3, 4 THE OUTER SKIRT 4 SHOWING A TAPERED OUTER FACE 4. C. THE INVENTION APPLIES TO DEVICES OF STOPPER FOR BOTTLES.

Description

The invention relates to a closure device for bottles. The

  Clogging devices made of plastics must meet the opposite criteria in that the plastics material must be sufficiently flexible to elastically press on the neck of a bottle and ensure a good seal and sufficiently hard for the stopper to be handled. when closing and opening

of the bottle without deforming.

  In addition, when this closure device is provided with a safety ring highlighting that the bottle has not been opened, this plastic must be brittle,

  to allow the ring to break during unblocking.

  For this reason, many plastic closure devices made up to now consisted of two or three pieces, namely a bowl housed inside the neck of the bottle and made of flexible plastic material, a hollow element or plug itself made of hard plastic material and possibly a ring made of material

brittle plastic.

  It is therefore understood that these closure devices

  are expensive because of the number of parts used.

  The present invention is intended in particular to remedy these drawbacks and concerns for this purpose a cap device for vials consisting of a hollow plastic element provided on its inner lateral circular face with means, such as a thread for its fixing on the neck of a bottle, characterized in that the inner bottom face of the hollow element is provided with two coaxial circular skirts, the outer skirt having a conical outer face. According to another characteristic of the invention, the outer skirt has a decreasing wall thickness

  from the inner face of the bottom of the hollow element.

  According to another characteristic of the invention, the inner skirt is cylindrical and has a thickness of

constant wall.

  According to another characteristic of the invention, it has a conical zone at the junction of the inner face of the bottom and of the inner lateral face, this conical zone being

  inclined in the opposite direction of the outer wall of the outer skirt.

  pool. The invention is represented by way of nonlimiting example in the single drawing attached which is an axial sectional view of an embodiment of the invention.

  The object of the invention is therefore to achieve

  a closure device which ensures a tight closure and security of a bottle and which can be manufactured in

  one piece using a single plastic material, this

  positive being therefore of a low cost price.

  This device consists of a hollow element 1, made in one piece by molding a sufficiently hard and brittle plastic material, the bottom wall 2 of this hollow element having on its inner face 21 two circular skirts 3 and 4, coaxial with the axis XX of the hollow portion 1 of the element 1 and therefore coaxial with the circular inner face 31 of the wall

lateral 3.

  The inner skirt 3 is cylindrical and has a constant wall thickness whereas the outer skirt 4 has a conical outer wall 41 whose diameter has been decreasing since

  the bottom wall 2, the thickness of this outer skirt 4 de-

  also growing from the bottom wall 2 and towards the end

free of this skirt.

  1.3 The free end of this outer skirt 4 is preferably located at the same level as the free end of the

Inner skirt 3.

  This arrangement makes it possible to ensure that, when the hollow element 1 is screwed onto the neck of a bottle, using the thread 32 provided on the internal face 31 of the side wall 3, the internal edge of the neck of the bottle is gradually leaning on the conical outer face 41 of the outer skirt 4 in

producing a tight closure.

  Indeed, as and when screwing, the outer skirt 4 is deformed more and more due to the radial pressure directed towards the X-X axis and exerted by the neck of the bottle

  so that the free end 42 of the skirt 4, which is relatively

  flexible version given its small thickness, is elastically applied against the outer face of the skirt 3, which limits the deformation of the free end of the skirt 4 and prevents this deformation does not exceed the limit of elasticity beyond which there would be permanent deformation or

rupture of the skirt.

  This skirt thus being held by its free end 42 against the cylindrical skirt 3, the outer skirt 4 tends towards the end of the screwing, to bend elastically inwards, which further strengthens the tight assembly of the wall

  outer 41 of the skirt 4 on the neck of the bottle.

  This flexibility of the deformation of the outer skirt 4 retained by the inner skirt 3 also makes it possible to prevent rupture of the neck of the bottle during closure, which rupture would result from the combination of the radial and directed reaction force. outwardly of the skirt 4, against the inner wall of the neck of the bottle and the axial force exerted on the neck of this bottle by the thread 32 * In order to avoid more safely, this rupture of the neck of the bottle, according to the invention, a conical zone 5 is provided at the junction of the bottom wall 2 and of the side wall 3, this conical zone 5 being inclined in opposite directions of the outer face 41 of the skirt. 4 at the end of the screwing, the neck of the vial comes 2 applied by its outer edge against the conical surface 5, while the

  inner edge is sealingly supported on the outer face 41.

  the conical zone 5 then exerts on the neck of the bottle a radial force which balances the opposite direction force exerted by the skirt 4, which eliminates any risk of rupture of the

  neck of the bottle when it closes while contributing to

improve the tightness of the closure.

  the watertightness ensured by the device of the invention

  In the case where, as shown in the figure, the part 5 is conical and its slope in the opposite direction to that of the element 4, the neck of the bottle-container is enclosed in a kind wedge formed by the elements 4, 5 which is without

  doubt one of the best ways to ensure a seal.

  Then the neck of the container, during its introduction

  duction exerts a pressure on the skirt 4 Since this skirt 4 is provided with flexibility because of its shape and its decreasing thickness, the skirt 4 is pressed against the wall 3 This is rigid, its thickness being constant and sufficient to ensure its rigidity, Thus, the skirt 4 exerts against the wall of the container neck a pressure such that it provides a remarkable seal by the elastic deformation of the skirt 4 limited progressively by the wall D. The low risk of breakage of the neck of the glass bottle is explained by the fact that the neck of the bottle is clamped symmetrically between 5 and 4, while in many other known closures, the sealing is provided by the interior the neck of the bottle, a force is exerted only from the inside of the collar to the outside without compensation by an element 5 It is thus established a kind of overhang which can

  cause the neck of the bottle to rupture.

  The hollow element 1 also comprises, on the edge of its opening, a cylindrical ring 6 provided on its inner wall with regularly distributed bosses 61 intended to catch on an annular flange provided on the external face of the neck of the bottle, this ring is also relée at the edge of the opening 12 of the hollow element 1 by tabs 7, this ring thus constituting a safety device whose presence on the cap sealing a bottle ensures that this

  last was not previously opened.

  Indeed, during unscrewing of the hollow element 1, the ring 6 is retained on the neck of the bottle by bosses 61, which produces axial traction on the tongues 7 which break to allow the complete unscrewing of the element

hollow 1.

  the edge 12 of the opening of the hollow element is also provided with a circular extension 8 extending outside the tongues 7 and over at least a portion of the height of the ring 6 to make these tongues invisible. and also to avoid that, despite the hardness of the plastic material implemented, it is possible to introduce a tool under the ring 6 to disengage the bosses 61 of the bottle and thus allow the opening of the bottle without causing the breaking

tabs 7.

  the detachment of the extension 8 relative to the body of the hollow element 1 allows the introduction between the

  extension 8 and the ring 6 of an element of the injection mold.

  This element ensures the proper injection of parts 6 and 7

  which constitute the guarantee of inviolability.

  In this description, it is stated that

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  the inner skirt 3 is cylindrical and has a constant wall thickness It will however be noted that, in practice, this skirt will have internal and external faces slightly

  tapered to allow demolding of the device.

  For the same reasons, the inner face of the

  skirt 4 will also be made slightly conical.

  Also, in the present description, it is

  indicated that the outer skirt 4 has an outer wall 41 which is conical However, the generatrix of this c 8 may not be rectilinear and for example be concave, the curvature of this generator being a function of the height of the skirt, its diameter, its thickness at the junction with the bottom 2 and the

  nature of the plastic material implemented.

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Claims (1)

  ) Closing device for bottles consisting of a hollow element (1) made of plastic material provided on its circular inner lateral face with means (32) such as a thread, for its attachment to the neck of a bottle, characterized in that the inner face (2 i) of the bottom   of the hollow element is provided with two circular skirts   xiales (3,4), the outer skirt (4) having a conical outer face (4) having a conical outer face (41).   ) Device according to claim 1, characterized in that the outer skirt (4) has a decreasing wall thickness from the inner face (21) of the bottom (2) of the hollow element and thereby ensures a certain elasticity.   Device according to claim 1, characterized in that the inner skirt (3) is cylindrical   and has a constant and rigid wall thickness.   ) Device conforming to any of the   preceding claims, characterized in that it presents   a conical zone (5) at the junction of the inner face of the bottom (2) and the inner lateral face (31), this conical zone being inclined in opposite directions of the outer wall (41) of the outer skirt (4), the walls (4 and 5) forming a wedge into which the neck of the bottle is inserted to ensure a   concomitantly, the sealing.    ) Device conforming to any of the   preceding claims, characterized in that the extremity   open (12) of the hollow member (1) is provided with a ring having, on its inner face, hooking means (61) intended to engage on a rim of the neck of the bottle,   this ring (6) being connected to the hollow element by tongues.   ) Device according to claim 5, characterized in that the hollow element has at its open end a circular extension (8) extending outside the tongues (7) and the ring (6) on at least one part the height of this ring.