GB2265973A

GB2265973A - Casing for fireworks

Info

Publication number: GB2265973A
Application number: GB9307598A
Authority: GB
Inventors: Fernando Garcia Gamon; Manuel Garcia Gamon
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-04-10
Filing date: 1993-04-13
Publication date: 1993-10-13
Anticipated expiration: 2013-04-13
Also published as: ITMI930283U1; ITMI930283V0; FR2689970A1; IT229798Y1; FR2689970B3; DE9305340U1; PT8746U; ES1020899Y; ES1020899U; PT8746T; GB2265973B; GB9307598D0

Abstract

A casing (2) for fireworks comprises at least two hollow half-casings formed of layers of pressboard. At least one of the half-casings is provided with an axial orifice, advantageously arranged to receive, in a moulding operation, a plastic tubing (3) which is provided with an axial passage (4). The walls of the tubing (3) may be partially incorporated into the casing (2) at the edges of the orifice so as to provide an axial extension to the pressboard half-casing, in order to constitute the plastic shell of a fuse for the transmission of a flame to the inside of the casing. <IMAGE>

Description

CASING FOR FIREWORKS The present invention relates to a casing for fireworks.

The invention relates in particular to casings comprising at least two half or part casings produced from layers of pressboard, and having a fuse through which the fire is transmitted to its interior filled with the pyrotechnic charge.

The use of casings for fireworks based on two halfspheres produced manually on a small scale, made from pressboard, has been known for a very long time in the field of explosives for fireworks. It involves use of a material which is perfectly mouldable and which gives the casing the required shape which is sufficiently resistant to deformation to enable the charge of pyrotechnic balls to be accommodated in its inner volume.

Development in the field over time has seen the introduction of the use of new materials in the manufacture of the casings for fireworks, such as plastic. This has given rise to variations in manufacturing procedures, from a manual form to another, automatic, form. Thus, this permits the series production of casings having a high mechanical strength and with substantially lower manufacturing costs.

However, despite the advantages and safety considerations involved in the use of plastic materials for manufacturing pyrotechnic artifacts, the use of pressboard casings continues due to its satisfactory operation and the low level of ecological damage caused by the casing remains. In this respect, the casings are reduced to simple ashes after the explosion, with virtually no environmental pollution.

This has led to the study of new systems for improving the manufacture of the casings obtained using pressboard, in particular introducing new procedures which make it possible to speed up their laborious small-scale construction. Also, this is supplemented by more advanced and automatic techniques for obtaining those elements which are difficult or complex to produce manually.

The present invention develops the above objectives and proposes their appropriate resolution by supplying an improved casing for fireworks in which its body consists of pressboard whose remains are biodegradable and which has the advantage of having an element of its configuration, such as the fuse, constructed from a material of a different type from that of the general body of the casing. Preferably the casing is made by means of an automatic procedure, which speeds up the general process for manufacturing the casing , and improves the physical shell through which the flame is transmitted inside the casing.

To this end, the invention is based on a casing consisting of at least two hollow half-casings obtained from layers of pressboard coupled together to constitute for example a pyrotechnic sphere or, alternatively, a cylindrical or polygonal case whose inside contains the charge of colours and explosive.

Embodiments of the casing are characterised by a central axial orifice advantageously arranged to receive, in a moulding operation, the construction of a plastic tubing provided with an axial bore or passage. Thus, at least one of the half-casings is provided, in its polar zone, if it is spherical, or, alternatively, in its base, if it is cylindrical, with an axial orifice.

During the moulding operation, the walls of the tubing are preferably incorporated into the edges of the orifice of the cardboard casing, said tubing adhering perfectly to the pressboard half-casing as an axial extension thereof.

In this manner, the tubing constitutes the plastic shell which will contain the compacted powder or rapid wick for acting as a fuse to transmit the flame from the firing body to the inside of the cardboard casing.

On the basis of the above, embodiments of the invention provide the following advantages: Improvements of the configuration of a casing for fireworks, consisting of a general pressboard body which is combined with a plastic-type fuse, with the aim of achieving a casing which both transmits the flame and does not leave remains which give rise to ecological damage; Speeding-up of the process for manufacturing conventional pressboard pyrotechnic casings, by incorporating automatic procedures for manufacturing the fuse, resulting in a saving in time and energy; and Simplification of the organisation and arrangement of the elements constituting the casing for fireworks, which enables it to be obtained easily at a reduced manufacturing cost.

Embodiments of the present invention will now be described in more detail by way of example, with reference to the accompanying drawings in which: Fig. 1 is a cross-sectional view of a first, spherical casing; and Fig. 2 is a cross-sectional view of a second, cylindrical casing.

The illustrated casings are improved by constructing, in the polar zone of each half-casing, if it is spherical, or, alternatively, in the geometrical centre of its base, if it is cylindrical, a plastic-type tubing which is joined to the half-casing during the actual modelling operation with the aim of constructing a fuse, of a type different from that of the casing.

In more detail, Fig. 1 illustrates the cross section of a casing (1) for fireworks which is generally of spherical configuration. In this casing (1), it is observed that, in the polar zone of the half-sphere, a tubing (3) has been moulded. The walls of the tubing (3) are incorporated into the edges of the orifice provided in the cardboard halfcasing. The tubing (3) defines an axial passage (4) for the powder or wick for transmitting the flame to the inside of the casing.

Fig. 2 illustrates the cross section of a casing (2) for fireworks of cylindrical configuration. In this casing (2), it is observed that the tubing (3) has been moulded in the central orifice of the base of a half-casing or lid of a casing, the walls of the tubing (3) being incorporated into the edges of the orifice of the casing (2) to which it adheres, forming a single body.

The various components which made up the improved casing for fireworks, according to the embodiments provided, are described in detail and listed below.

With reference to Figs. 1 and 2, it can easily be appreciated that the casing consists of at least two halfcasings of spherical constitution (1) or of cylindrical constitution (2) produced from pressboard.

The like half-casings are provided with an axial orifice in the polar zone of the half-sphere for casing 1, or, alternatively, in the centre of the base of the cylindrical half-casing for casing 2. The orifices are arranged to receive the construction, by means of moulding in situ, of a tubing (3) provided with axial passage (4).

The walls of said tubing (3) are partially incorporated into the edges of the orifices in the cardboard half-casings.

This enables the tubing (3) to adhere perfectly to the casing, in a non-removable manner (5).

All this is arranged such that the plastic tubing (3) will make it possible to have available in its axial passage (4) a blast or moist-powder wick for acting as a fuse for transmitting the flame to the inside of the pressboard casing.

It will be appreciated that modification of the illustrated embodiments is possible.

Claims

1. A casing for fireworks comprising at least two hollow part-casings which are made of layers of pressboard and coupled together, wherein at least one of the part-casings is provided with an axial orifice which receives a plastic tubing having an axial passage therethrough so as to provide a plastic shell for a fuse for transmission of a flame to the inside of the casing.

2. A casing according to Claim 1 which is spherical and has an orifice provided in a polar zone.

3. A casing according to Claim 1 which is cylindrical and has an orifice in the centre of its base.

4. A casing according to any preceding claim wherein the casing at the edges of the axial orifice is adhered to the tubing.

5. A casing according to Claim 4 wherein the tubing is incorporated into the casing at the edges of the axial orifice.

6. A casing according to claim 4 or claim 5 wherein the casing and tubing are moulded together.

7. A casing substantially as hereinbefore described, with reference to, and as illustrated in, the accompanying drawings.

8. A casing according to any preceding claim charged with fireworks.