FR2639429A1 - PYROTECHNIC FIREWORK ELEMENT - Google Patents

Abstract

The pyrotechnic device is of the type intended to be suspended above the ground. It comprises grains of pyrotechnic material 2 of a size which is a function of their required average combustion time, packaged in a package consisting of at least one sheet of paper 1. The grains 2 are spread and maintained on the surface of the sheet. which also constitutes means of firing them. The sheet 1 is folded or rolled up on itself and is, at its upper part, provided with an adhesive tape 3 intended to hold the sheet in its folded or rolled up state. The fireworks element comprises, at its lower part, an ignition layer 5 and, at its upper part, a stiffening tape 4.

Description

The invention relates to pyrotechnic devices.

  entertainment channels to be suspended

  above the ground to form a waterfall

  lant. Pyrotechnic devices of this type are known comprising grains of pyrotechnic material embedded in a mechanical binder constituting at the same time means for igniting the grains. These grains have a size depending on the desired burning time. The binder is in the form of bread wrapped in an open envelope at its end intended to be

  turned towards the ground. The opposite end of the envelope

  pe is connected to a device allowing the suspension

  of the device on for example a structure.

  , These devices. may be provided with a

  ignition charge consisting of an ignition composition

  table which can be triggered either by an electric initiator allowing the remote triggering of a

  artifice or by a classic system of wicking.

  The object of the invention is to propose an element

  pyrotechnic device which is easy to manufacture

  quer and which is significantly cheaper than the elements

known fireworks.

  The subject of the invention is an element of arti-

  pyrotechnic device intended to be suspended above the ground, comprising ignition means and grains of pyrotechnic material of a size which is

  according to their required average burning time.

  characterized in that the grains are packed in a package consisting of at least one paper sheet, the grains being spread on said sheet and held in place by retaining means, and in that said sheet also constitutes the means of

Firing.

  According to other characteristics of the invention

  tion: - the sheet is folded back on itself in an accordion. - the sheet is wound on itself in a spiral. - the sheet is, at its end intended for

  be turned upwards, provided with means of linking

  its intended to keep it in its folded state or

rolled up.

  the means for retaining the grains on the sheet consist of a layer of a combustible adhesive product applied to at least one of the

sides of the sheet.

  - the means for retaining the grains on the

  leaf are formed by the very wall of the leaf

  the in its folded or rolled up state.

  - the sheet is, at its end intended for

  be turned downwards, provided with a layer of allu-

  mage stretching along the edge of the sheet on at

  minus part of its length.

  - at least one of the lateral ends of the sheet is extended in order to form an envelope

  which surrounds the element and which forms a conti-

protection naked.

  The pyrotechnic firework element according to the invention will now be described in more detail with reference to the accompanying drawings in which:

  - Figure I is a plan view of an element

developed fireworks;

  - Figures 2 and 3 are schematic view-

  in perspective and at the end of an ar-

  structure according to a first embodiment of the invention

vention;

  - Figures 4 and 5 are schematic views

  in perspective and at the end of an ar-

  structure according to a second embodiment of the invention

  vention. According to the embodiments illustrated on

  the figures, the pyrotechnic element has only one

  the paper sheet 1 on which a combustible adhesive product is applied, for example a viscous nitrocellulose solution, forming a thin adhesive layer. This adhesive layer constitutes means for retaining grains 2 of pyrotechnic material which are regularly spread over the sheet 1. The grains are

  according to an alternative embodiment, coated with a pro-

  said combustible adhesive before being spread on the sheet which may then not itself contain

adhesive layer.

  The sheet I is, in its part intended to be directed upwards, henceforth called the upper part, provided with an adhesive tape 3 extending

  along the corresponding edge of the sheet and overlap

  edge part of the outer face thereof. This tape can naturally also be placed on the internal face of the sheet which can also be

  provided with a second adhesive tape arranged at the end

opposite half of the leaf.

  In case the sheet of paper is min-

  this and therefore relatively fragile, an element of rigidl-

  Fication in the form of a cardboard tape 4 is advanced.

  taggedly attached to the top of the sheet.

  This stiffening element extends parallel to the

  tape over part of the length of it

  ci and can be drilled with one or more holes

  intended to receive a string or other fastening device for the suspension of the element above

of the ground.

  The sheet is, in its part intended to be

  directed downwards, now called the lower part

  lower, provided with a layer of an ignition material disposed near the corresponding edge and preferably extending over the entire length thereof. According to an embodiment illustrated in Figures 2 and 3, the sheet 1 forming a support for the grains 2 is folded on itself in an accordion. The folded parts of the sheet are held together

  against others using tape 3.

  According to another embodiment illustrated in FIGS. 4 and 5, the sheet 1 is wound in a spiral on itself and kept wound using the adhesive tape 3. This tape can moreover be replaced by another connecting means suitable as

  for example glue or rivets.

  The device can, as already mentioned,

  tionné, be provided with a second adhesive tape placed at the lower end of the sheet in order to better hold together the folded or rolled parts of

leaf.

  According to another non-il-

  glossy in the figures, two flat sheets are dis-

  placed one against the other and fixed to each other at least at their upper end by a tape

  adhesive. Fireworks can, according to this

  of production, be made from ribbons

  made of paper which are then cut to lengths ap-

properties.

  The means of retaining the pyrotechnic grains

  ques 2 between the sheet parts 1 folded and rete-

  naked against each other, or in a sheet wound on itself, or between two flat sheets, can advantageously be formed by the same wall of the sheet in the case where this wall is relatively rigid so as to be able to form an element of 'compact device in which the parts of the sheet are biased against each other during folding or winding of the sheet. In

  in this case, no adhesive is required.

  The sheet can advantageously be a sheet of embossed paper. The grains are, in this case, held captive in cells which are formed when the sheet is folded or rolled up.

  itself or when several sheets are superposed

on top of each other.

  At least one of the lateral ends of the sheet according to the embodiment illustrated in Figures 2 and 3 can be extended to form an envelope which surrounds the folds and which forms a

continuous protective surface.

  According to the embodiment illustrated on

  Figures 4 and 5, such an envelope is automatically

  only formed when the sheet is rolled up on itself.

  We can also consider a separate envelope

  ree of, for example, a thin plastic material

  water permeable to protect the firework

  against humidity until use.

  The operation of the pyrotechnic firework element is simple. The element is suspended at a certain height above ground level and the layer of ignition material is ignited. The leaf is thus ignited and burns while releasing the grains which are successively lit and fall

  towards the ground by developing the light intensity re-

  quise. The grains thus form a cascade of fire as they fall. The pyrotechnic firework element according to the invention is easy to manufacture since it can be formed by a single sheet of paper folded or rolled up on itself and its cost price is thus extremely low.

Claims (13)

  1.- Element of pyrotechnic device intended to be suspended above the ground. with   ignition means (1) and grains of py-   rotechnique (2) of a size which is a function of their required average burning time, characterized in that the grains (2) are packaged in a packaging consisting of at least one paper sheet (1), the grains (2 ) being spread on said sheet and retained   in place by retaining means, and in that the ladi-   The sheet also constitutes the means of fire (1}.   2.- element of pyrotechnic device according to claim 1, characterized in that said   sheet (1) is folded back on itself in an accordion.   3.- pyrotechnic device according to claim 1, characterized in that said   sheet (1) is wound on itself in a spiral.   4.- pyrotechnic device according to claim 2 or 3, characterized in that the   sheet (1) is, at its end intended to be rotated   born upwards, provided with connecting means (3) intended to maintain the sheet in its folded or rolled up state. 5.- pyrotechnic device according to claim 4, characterized in that the means   connection (3) consist of an adhesive tape   stretching over the entire length of the sheet (1) and overlapping part of it.   6.- Next pyrotechnic firework element   any of the preceding claims,   characterized in that the means for retaining the grains (2) on the sheet (1) consist of a layer of a combustible adhesive product applied to at least one side of the sheet.   7.- Next pyrotechnic firework element   any one of claims 1 to 5, characterized   in that the grains (2) are coated with a combustible adhesive product constituting the means for retaining them on the sheet (1), 8. Next firework element   any one of claims 1 to 5, characterized   in that the means for retaining the grains (2) on the sheet (1) consist of the very wall of the   sheet in its folded or rolled up state.   9. A pyrotechnic firework element according to claim 8, characterized in that the sheet (1) is made of embossed paper and in that the wall of the   sheet forms, in its folded or rolled up state, al-   voles in which the pyrotechnic grains (2) are kept prisoners.   10.- Pyrotechnic fireworks element   any of the preceding claims,   characterized in that the sheet (1) is, at its end   mite intended to be turned upwards, provided with a stiffening tape (4) extending along the   edge of the sheet over at least part of the length cheer of it.   11.- Pyrotechnic fireworks element   any of the preceding claims,   characterized in that the sheet (1) is, at its end   mite intended to be turned downwards, provided with an ignition layer (5) extending along the edge of the sheet over at least part of the length of it.   12.- Pyrotechnic fireworks element   before any of claims 1, 2 and 4 to   11, characterized in that at least one of the ends g   side of the sheet (1) is extended to form   sea an envelope which surrounds the element and which forms a continuous protective surface.   13.- Pyrotechnic fireworks element   any of the preceding claims.   characterized in that it is further provided with a   protective cover made of a waterproof material.