JPH0214638B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a flat ball firework in which an explosive portion is formed by adding gunpowder to a flexible sheet-like mount in the form of a flat hemisphere. It is.

<Conventional technology> Conventional flat ball fireworks of this kind are often used for starting signals at sports events, etc., and are made so that when struck by a starting pistol, the explosive part ignites and explodes, producing a starting sound. There is.

This type of flat firework has a flat hemispherical explosive part formed on a mount, and this explosive part is made of a mixture of two or three flavors of potassium chlorate, red phosphorus, and sulfur on the mount. It is made by adding chemicals and covering the surface with paper.

Normally, a large number of the above-mentioned explosive parts are formed on a single mount, and when used, the mount is cut into small pieces for each explosive part, and these small pieces are loaded into a pistol. ing.

<Problems to be Solved by the Invention> Since the conventional flat ball fireworks have a structure in which the flat hemispherical explosion part formed on the mount is covered with paper, the following problems can be avoided. Nakatsuta.
First, the explosive part instantly destroys the covering paper at the time of detonation, so the explosive energy is instantaneously dissipated.
Therefore, in order to obtain a loud sound, it is necessary to increase the amount of explosives in the explosion part, which not only increases the danger in handling but also increases the cost.

Another problem is that since the paper covering the explosion part is flexible, external shocks are easily transmitted, making it easy for unexpected explosions to occur due to external shocks.

<Means for Solving the Problems> In the present invention, the explosive portion 20 formed on the mount 10 is hermetically covered by an outer shell layer 30 made of a hard material. Furthermore, a stretchable outer coating 40 is overly coated.

The outer shell layer 30 is the base surface 3 layered on the mount.
1 is continuous with this basal surface 31 and the explosion part 20
It is composed of a shell part 32 that covers and closes the upper surface of the
The explosive part 20 has an additive on the base surface.

<Function> Since the flat firework of the present invention is as described above, when a striking force is applied to the shell part 32, the explosive part 20 is ignited by this striking force, and the explosion energy obtained thereby becomes a shock wave. occurs as.

This shock wave is obtained by first accumulating explosive energy within the outer shell layer 30 and then dissipating this explosive energy by destroying the shell portion 32 of the outer shell layer 30, so the instantaneous energy is large and the The explosion sound was also loud.

Due to the large instantaneous energy when the shell is broken, the shell 32 is crushed and scattered, but this scattering is prevented by the outer coating 40.
Accidents such as powder from the outer shell layer getting into the eyes are prevented.

<Example> FIG. 1 is a perspective view of a flat firework according to the present invention. In this example, a large number of explosive parts 20 are arranged in parallel on a mount 10, and each explosive part 20 is sealed with an outer shell layer 30. This outer shell layer 30 is covered with an elastic outer coating 40 bonded thereto.
The mount 10 is made of a flexible sheet-like material such as synthetic resin film or paper, and perforations 11 are formed so that the explosion parts 20 on the mount can be individually cut out.

The explosive part 20 is made by adding 0.01 to 0.07 g of gunpowder in the shape of a flat hemisphere, and the gunpowder used is a known muddy red phosphorus gunpowder.

The outer shell layer 30 is made of a hard material such as gypsum or calcium carbonate, and in the embodiment, water-mixed gypsum mud with about 10% glue added as a binder is used.

As shown in FIG. 2, this outer shell layer 30 is formed by applying or spraying gypsum mud onto the mount 10, thereby forming a base surface 31.
After forming the explosive part 20 by adding gunpowder to the shell, the explosive part 20 may be coated with gypsum mud to form a shell part 32, or as shown in FIG. It is also possible to form a large number of circular base surfaces 31 individually on the mount 10, arrange the explosive portions 20 thereon, and then cover each base surface 31 with the shell portion 32.

The hardness, and therefore the explosion resistance, of this outer shell layer 30 can be freely designed depending on the type of material used, the amount of binder, and the layer thickness.

The outer coating film 40 is made of a stretchable material such as rubber or synthetic resin, and in the embodiment, after the shell portion 32 of the outer shell layer 30 is dried, the shell portion 32
It is formed by applying synthetic resin paint mixed with rubber glue to the surface.

The outer shell layer 30 may be coated with the outer shell layer 30 for each explosion part 20, but in order to maintain the waterproofness of the mount 10, a waterproof outer coat 50 is formed over the entire back surface of the mount 10. At the same time, it is desirable to make the stretchable outer coating 40 waterproof and to cover the entire surface of the mount 10 as shown in FIG.

<Effects of the Invention> Since the flat firework of the present invention has each explosion part 20 tightly covered with a hard outer shell layer 30 as described above,
In addition to increasing the explosion pressure resistance during ignition and producing a large explosion sound with a small amount of gunpowder, the elastic outer coating 40 prevents the outer shell layer 30 from becoming powdered and scattering during an explosion. Furthermore, since the explosive part 20 is always covered with the hard outer shell layer 30, it is possible to prevent the danger of the explosive part 20 igniting due to a small impact from the outside. There is also this effect.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the flat ball firework of the present invention, and FIGS. 2 and 3 are longitudinal cross-sectional views of essential parts showing embodiments of the same flat firework. In the figure, 10 is a mount, 20 is an explosive part, 30 is an outer shell layer, 31 is a base surface, 32 is a shell part, and 40 is an elastic outer coating.

Claims (1)

[Claims] 1 A flexible mount, an outer shell layer formed of a hard material on the mount, an explosive part sealed and closed within the outer shell layer, and an elastic outer coating covering the outer shell layer. The outer shell layer is composed of a base surface layered on the mount, and a shell part continuous with the base surface and covering and closing the explosive part, and the explosive part has:
A flat firework characterized in that it is made by adding gunpowder in the shape of a flat hemisphere on the base surface of the outer shell layer, and the outer shell layer is configured to cover the entire surface of the shell portion.