Firecracker and firecracker arrangement

Abstract

A firecracker and firecracker arrangement. The firecracker includes an outer sheath having two face sides and that is closed at both face sides with a layer of barrier material. Pyrotechnic effect elements and a bursting charge are arranged inside the outer sheath. A first ignition line that penetrates the barrier material is guided up to the bursting charge. The bursting charge is accommodated inside a completely closed, cylindrical jacket that is arranged coaxial to the outer sheath such that a longitudinal center axes of the outer sheath and of the cylindrical jacket coincide. The first ignition line is guided through an opening in the cylindrical jacket to the bursting charge. The pyrotechnic effect elements are arranged to form a predefined geometric shape in at least one plane extending transverse to the longitudinal center axis of the outer sheath.

Claims

1. A firecracker comprising: a cylindrical outer sheath having two face sides, which is closed at both of the outer sheath's face sides with a layer of barrier material; a plurality of pyrotechnic effect elements arranged inside the outer sheath; a bursting charge arranged inside the outer sheath for bursting the outer sheath and for scattering the pyrotechnic effect elements; and a first ignition line which penetrates the barrier material at a first face side of the two face sides and which is guided up to the bursting charge; wherein the bursting charge is accommodated inside a completely closed, cylindrical jacket, with the cylindrical jacket being arranged in a manner coaxial to the outer sheath such that a longitudinal center axes of the outer sheath and of the cylindrical jacket coincide, with the first ignition line being guided through an opening in the cylindrical jacket to the bursting charge, and in that the pyrotechnic effect elements are inside the outer sheath and outside the cylindrical jacket between a cylindrical side wall of the cylindrical jacket and a cylindrical side wall of the outer sheath and are arranged to form a predefined geometric shape in at least one plane extending transverse to the longitudinal center axis of the outer sheath.

2. The firecracker according to claim 1, wherein the cylindrical jacket is closed at the cylindrical jacket's opposite face sides with a layer of a barrier material.

3. The firecracker according to claim 1, wherein the pyrotechnic effect elements are arranged in a plane cutting the longitudinal center axis of the cylindrical jacket at a level of a center of the longitudinal extension of the cylindrical jacket.

4. The firecracker according claim 3, wherein the longitudinal center axis of the cylindrical jacket extends through a geometric center of the predefined geometric shape, which the pyrotechnic effect elements are arranged to form.

5. The firecracker according to claim 3, wherein the pyrotechnic effect elements are arranged in the plane cutting the longitudinal center axis of the cylindrical jacket at the level of the center of the longitudinal extension of the cylindrical jacket at a right angle.

6. The firecracker according claim 1, wherein the pyrotechnic effect elements are arranged in a circle, or a heart-shape or a star-shape.

7. The firecracker according to claim 1, wherein the pyrotechnic effect elements inside the outer sheath and outside the cylindrical jacket, between the cylindrical side wall of the cylindrical jacket and the cylindrical side wall of the outer sheath, are arranged to form predefined geometric shapes in at least two planes which are parallel to one another.

8. The firecracker according to claim 1 wherein a space is defined between the cylindrical jacket and the outer sheath and the space is filled with a non-explosive filling material, and the pyrotechnic effect elements are embedded in the non-explosive filling material in the predefined geometric arrangement.

9. The firecracker according to claim 1, wherein the pyrotechnic effect elements are fixed, to an inner side of the cylindrical side wall of the outer sheath.

10. The firecracker according to claim 9, wherein the pyrotechnic effect elements are glued to an inner side of the cylindrical side wall of the outer sheath.

11. The firecracker according claim 1, wherein the cylindrical jacket is formed from a cardboard material or from a plastic material.

12. The firecracker according to claim 1, wherein the firecracker contains a maximum net explosive mass of 25 g.

13. The firecracker according to claim 1, wherein the outer sheath has a diameter of 14 to 50 mm.

14. The firecracker according to claim 13, wherein the outer sheath has a diameter of 20 to 40 mm.

15. The firecracker according to claim 14, wherein the outer sheath has a diameter of 30 mm.

16. A firecracker arrangement with at least one tubular receptacle to be arranged vertically, in which a firecracker according to claim 1 is arranged with the first face side adjoining a first end of the firecracker and orientable facing downwards, with a propellant for launching the firecracker from the at least one tubular receptacle arranged beneath the first face side at the first end of the firecracker and wherein the firecracker is arranged in the at least one tubular receptacle with a second ignition line being provided for igniting the propellant and for igniting the first ignition line.

17. The firecracker arrangement according to claim 16, wherein the at least one tubular receptacle comprises a plurality of tubular receptacles arranged parallel relative to one another and essentially vertically, wherein in each of the plurality of tubular receptacles a firecracker is arranged with the first face side facing downwards, and with a propellant being arranged beneath the first face side of each of the firecrackers in each of the plurality of tubular receptacles for the launching of the respective firecracker from the respective tubular receptacle, and with a second ignition line for the consecutive ignition of a propellants and for ignition of the respective first ignition line of a respective firecracker being guided in such a way through the firecracker arrangement that the second ignition line ignites the propellants of the plurality of tubular receptacles in a sequential manner.

18. The firecracker arrangement according to claim 17, wherein the at least one tubular receptacle is closed at a second end with a sealing closure.

19. The firecracker arrangement according to claim 18, wherein the at least one tubular receptacle is closed at the second end with a sealing plate.

20. The firecracker arrangement according to claim 16 having a maximum net explosive mass of 500 g.

21. The firecracker according to claim 1, wherein the pyrotechnic effect elements inside the outer sheath and outside the cylindrical jacket between the cylindrical side wall of the cylindrical jacket and the cylindrical side wall of the outer sheath are arranged to form a predefined geometric shape in at least one plane extending perpendicular to the longitudinal center axis of the outer sheath.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

(1) Additional advantages and features of the invention will emerge from the following description of an exemplary embodiment with reference to the attached FIGURE, in which single FIGURE:

(2) FIG. 1 shows a schematic longitudinal sectional depiction through an arrangement of a firecracker according to the invention in a receiving tube fitted with a propellant.

(3) The single FIG. 1 illustrates, in a highly schematic depiction, an exemplary embodiment according to the invention of a firecracker and a firecracker arrangement according to the invention.

DETAILED DESCRIPTION

(4) A firecracker 1 according to the invention is formed here in the form of a so-called bombette. It has an outer cylindrical sheath 2, which is in particular formed from a paper or cardboard material with a stable wall thickness. At the face side, this sheath 2 is closed in each case by means of a layer of barrier material 3. A first ignition line 4 is passed through the layer of barrier material 3 depicted at the bottom in FIG. 1 and projects outwards from the firecracker 1. A bursting charge 6 made from an explosive material is arranged in a cylindrical jacket 5, which is constructed in a dimensionally stable manner and which can in particular be formed from a cardboard material or plastic material. The cylindrical jacket 5 is closed at each of its face sides with a layer of a barrier material 13. This can be the same barrier material as the barrier material 3 which closes the firecracker 1 at the face side. The face side closure of the cylindrical jacket 5 ensures that the pressure pulse obtained by the ignition of the bursting charge 6 acts in a radial manner and is not dissipated axially via the face sides. The first ignition line 4 is guided through a face side of the cylindrical jacket 5 arranged at the bottom in FIG. 1 and through the barrier material 13 arranged there until it is introduced into the bursting charge 6.

(5) The cylindrical jacket 5 with the bursting charge 6 arranged therein is oriented coaxial to the outer sheath 2 and is situated, when viewed transverse to the longitudinal direction, arranged centrally therein. That means that the longitudinal center axis of the outer sheath 2 and the longitudinal center axis of the cylindrical jacket 5 lie on one another in a substantially coincidental manner. In an annular space between the casing wall of the cylindrical jacket 5 and the outer cylindrical sheath 2 pyrotechnic effect elements 7 are arranged in a predetermined geometric shape, which in this case is circular. The pyrotechnic effect elements 7 lie in a planein this case a single plane, which here extends oriented perpendicular to the longitudinal center axis of the cylindrical jacket and cuts through the latter approximately centrally. A tipped-out depiction of the pyrotechnic effect elements 7 arranged in a circle is selected here solely for the purpose of illustration so as to show said pyrotechnic effect elements in their geometric arrangement.

(6) The number of pyrotechnic effect elements 7 depicted here does not necessarily correspond to the number of effect elements 7 arranged in the firecracker 1. The pyrotechnic effect elements 7 are embedded in a non-explosive filling material 8, for example, sand. By this means they are held in the set form and alignment relative to one another. As can be seen, the pyrotechnic effect elements 7 are here arranged in a circular shape and in a concentric manner about the cylindrical jacket 5.

(7) The firecracker 1 is arranged in a receiving tube 9, which can for example be a receiving tube 9 of a battery of firecrackers 1, with said receiving tube 9 extending vertically and a propellant 10 being arranged beneath the firecracker 1. A second ignition line 11 is guided through this propellant, with the first feed line 4 being brought close to said second ignition line with its end projecting from the firecracker 1. A sealing plate 12 closes the receiving point 9 above the firecracker 1 at the face side.

(8) To ignite the firecracker 10 the second ignition line 11 is ignited. Said ignition line burns down until it reaches the propellant 10, which is thus ignited. As a result of ignition of the propellant 10, the firecracker 1 is launched from the receiving tube 9 in the vertical direction and climbs into the sky. At the same time, when the propellant 10 is ignited, the end of the first ignition line 4 projecting from the firecracker 1 is ignited and burns through the layer of barrier material 3 depicted at the bottom in FIG. 1 and through the cylindrical jacket 5 until the bursting charge 6 is reached. The bursting charge 6 is thus ignited and breaks though the outer cylindrical sheath 2 and scatters the pyrotechnic effect elements 7 in a defined manner with a pulse which is essentially the same in terms of amount and which is directed radially outwards, so that a growing circle is produced in the sky as a pyrotechnic luminous geometric symbol. The delay between the ignition of the propellant 10 and the ignition of the bursting charge 6, which is determined by the configuration of the first ignition line 4, is selected such that the bursting charge 6 is ignited only once a predetermined climb height of the firecracker 1 is reached.

(9) The special feature of the arrangement of the bursting charge 6 in the cylindrical jacket 5 makes it possible to here arrange a corresponding accurately-formed geometric shape with the pyrotechnic effect elements 7 in a very small space in the firecracker and then in the sky. This applies in particular also to a bombette of category 2, in other words, with a maximum net explosive mass of 25 g for the discharge. The depicted bombette can for example have a diameter of the outer sheath 2 of 20 to 30 mm, in particular 30 mm.

(10) The exemplary embodiment depicted here does not limit the invention, which is defined by the claims below.

LIST OF REFERENCE NUMERALS

(11) 1 firecracker 2 outer cylinder casing-type sheath 3 barrier material 4 first ignition line 5 cylindrical jacket 6 bursting charge 7 pyrotechnic effect element 8 filling material 9 receiving tube 10 propellant 11 second ignition line 12 sealing plate 13 barrier material