GB2330896A

GB2330896A - Roman candle

Info

Publication number: GB2330896A
Application number: GB9823815A
Authority: GB
Inventors: Hiroo Ishibashi
Original assignee: Mantsuna & Co Ltd S
Current assignee: Mantsuna & Co Ltd S
Priority date: 1997-11-04
Filing date: 1998-11-02
Publication date: 1999-05-05
Also published as: GB9823815D0

Abstract

A daytime smoke Roman candle is disclosed which is capable of sequentially forming smoke clouds of desired colors in the air in the daytime. The daytime smoke Roman candle comprises a projection tube 2; a plurality of colored smoke stars 5 capable of generating colored smoke by combustion, the colored smoke stars 5 being placed in the projection tube 2 at intervals in the longitudinal direction of the projection tube 2; colored smoke-producing agent layers 7 placed over the colored smoke stars 5, respectively; a propellant layer 6 placed under each of the colored smoke stars 5; and a fuse 8 introduced into the colored smoke-producing agent layer 7 for the uppermost colored smoke star 5. By lighting the fuse 8, a plurality of colored smoke clouds are sequentially formed in the air.

Description

DAYTIME SMOKE ROMAN CANDLE FIELD OF THE INVENTION The present invention relates to a daytime smoke Roman candle capable of easily forming smoke clouds of desired colors in the daytime.

BACKGROUND OF THE rNVENTSON Heretofore, toy fireworks have been known which are capable of easily generating light of desired colors and patterns in the nocturnal air. The toy fireworks of this type are designed to provide a wide range of people from children to adults with ealtoyment by lighting a fuse in person to easily generate light of various colors and patterns, as opposed to fireworks used in a display of fireworks for providing spectators with only passive enjoyment.

However, the above-described conventional toy fireworks have a problem that they are used in the nighttime, at night and cannot be used in the daytime SMMXRY OF THE INVENTION The present invention has been made in view of the point. It is, therefore, an object of the present invention to provide a daytime smoke Roman candle capable of sequentially forming smoke clouds of desired colors in the air in the daytime.

To attain the above object, the daytime smoke Roman candle of claim 1 comprises: a projection tube, a plurality of colored smoke stars capable of generating colored smoke by combustion, the colored smoke stars being placed in the projection tube at intervals in the longitudinal direction of the projection tube, colored smoke-producing agent layers placed over the colored smoke stars, respectively, a propellant layer placed under each of the colored smoke stars, and a fuse introduced into the colored smoke-producing agent layer for the uppermost colored smoke star. By employing the constitution, when the fuse is lit, the flames of the fuse give rise to ignition of the uppermost colored smoke star. The flames of the colored smoke star in turn give rise to ignition of the propellant layer under the colored smoke star. By propelling force of the propellant, the colored smoke star is projected into the air while burning to form a colored smoke cloud of a certain color in the air.

Subsequently, the flames of the propellant for propelling the uppermost colored smoke star give rise to combustion of the next colored smoke star, and the flames of this colored smoke star in turn give rise to' combustion of the propellant layer located thereunder. By propelling force of the propellant, the colored smoke star is projected into the air while burning to form a colored smoke cloud of the next color. In this manner, colored smoke clouds of a plurality of colors are sequentially formed in the air.

The daytime smoke Roman candle of claim 2 comprises: a projection tube, a plurality of colored smoke stars capable of generating colored smoke by combustion, the colored smoke stars being placed in the projection tube at intervals in the longitudinal direction of the projection tube, a propellant layer placed under each of the colored smoke stars, non-combustible material layers each interposed between the propellant layer and the colored smoke star subsequent thereto, and a fuse extending in the projection tube along the longitudinal direction of the projection tube so as to be in contact with each propellant.

By employing this constitution, when the fuse is lit, the flames of the fuse give rise to ignition of the uppermost colored smoke star and ignition of the propellant layer under the colored smoke star. By propelling force of the propellant, the colored smoke star is projected into the air while burning to generate a colored smoke cloud of a certain color in the air. Subsequently, the flames of the fuse give rise to combustion of the next colored smoke star and combustion of the propellant layer located thereunder. By propelling force of the propellant, the colored smoke star is projected into the air while burning to form a colored smoke cloud of the next color. In this manner, colored smoke clouds of a plurality of colors are sequentially formed in the air.

The daytime smoke Roman candle of claim 3 comprises: aprojection tube, a plurality of colored smoke stars capable of generating colored smoke by combustion, the colored smoke stars being placed in the projection tube at intervals in the longitudinal direction of the projection tube, colored smoke-producing agent layers placed over the colored smoke stars, respectively, a propellant placed under each of the colored smoke stars, and an ignition agent placed over the colored smoke-producing layer for the uppermost colored smoke star for ignition of the colored smoke-producing agent layer. By employing the constitution, when the ignition agent is lit, the flames of the ignition agent give rise to combustion of the uppermost colored smoke star. The flames of the colored smoke star in turn give rise to combustion of the propellant layer under the colored smoke star. By propelling force of the propellant, the colored smoke star is projected into the air while burning to form a colored smoke cloud of a certain color in the air. Subsequently, the flames of the propellant layer for projecting the uppermost colored smoke star give rise to combustion of the next colored smoke star, and the flames of this colored smoke star in turn give rise to combustion of the propellant layer under the colored smoke star. By propelling force of the propellant, the colored smoke star is projected into the air while burning to form a colored smoke cloud of the next color in the air. In this manner, colored smoke clouds of a plurality of colors are sequentially formed in the air.

The daytime smoke Roman candle of claim 4 is characterized in that each of the colored smoke stars comprises a smoke-generating agent core grain coated with an ignition agent. By employing the constitution, upon ignition of the ignition agent for the colored smoke star, the flames of the ignition agent immediately catch the propellant layer for the colored smoke star to give rise to ignition of the propellant layer, thereby immediately projecting the colored smoke star into the air.

The daytime smoke Roman candle of claim 5 is characterized in that the colored smoke star comprises a core grain in a multi-layer structure which is made of layers of a plurality of smoke-generating agents capable of generating smoke of different colors by combustion. By employing the constitution, if one colored smoke star is projected, colored smoke clouds of a plurality of colors sequentially appear in the air.

BRIEF DESCRIPTION OF THE DRAWINGS Fig.l is a longitudinal sectional view showing main portions of a first embodiment of the daytime smoke Roman candle according to the present invention.

Each of Figs.2(a), 2(b) and 2(c) is a sectional view showing a structure of the colored smoke star in the daytime smoke Roman candle in Fig.l.

Fig.3 is a longitudinal sectional view showing main portions of a second embodiment of the daytime smoke Roman candle according to the present invention.

Fig.4 is a longitudinal sectional view showing main portions of a third embodiment of the daytime smoke Roman candle according to the present invention.

DETAIlED DESCRIPTION OF THE EMBODIMENTS Figs.l and 2(a)-2(c) show a first embodiment of the daytime smoke Roman candle according to the present invention. Fig.l is a longitudinal section of main portions thereof, and each of Figs. 2 -2 (c) is an illustrative view showing an example of a structure of a colored smoke star.

As shown in Fig.1, the daytime smoke Roman candle 1 of this embodiment comprises a cylindrically formed candle body 2 as a projection tube. A bottom 3 is provided in a lower end of the projection tube 2, and a top cover 4 is provided in an upper end of the projection tube 2.

Between the bottom 3 and the top cover 4 in the projection tube 2, a plurality of spherical colored smoke stars 5 are regularly spaced apart in the longitudinal direction of the projection tube 2. Under each of the colored smoke stars 5 in the projection tube 2, a propellant layer 6 for projecting a colored smoke star 5 by combustion thereof is so placed as to be adjacent to the colored smoke star 5. over the colored smoke stars 5 in the projection tube 2, colored smoke-producing agent layers 7 are placed for generating colored smoke, respectively. As the colored smoke-producing agents 7, various colored smoke-producing agents selected from conventional ones may be used. Further, a fuse 8 is introduced into a colored smoke-producing agent 7 placed over the uppermost colored smoke star 5, and a distal end of the fuse 8 is located outside the projection tube 2 via the top cover 4.

In Fig.l, the propellant 6 is shown magnified in order to distinctively show the propellant layers 6 and the colored smoke-producing agent layers 7 therebetween.

The colored smoke star 5 is formed into a substantially spherical shape as a whole in such a manner that a smoke-generating agent core grain 9(a) formed into a substantially spherical shape as shown in Fig. 2 (a) or a smoke-generating agent core grain 9 (b) formed into a substantially cylindrical shape as shown in Fig.2(b) is coated with an ignition agent 10 called as a quick burning agent (Hayabi) having high flamability. Further, when a core grain in a multi-layer structure which is made of layers of a plurality of smoke-generating agents 9c, 9d, 9e capable of forming colored smoke clouds having different colors is enveloped in an ignition agent 10 as shown in Fig.2 (c), colored smoke clouds having a plurality of colors can be produced by means only of a single colored smoke star 5, thereby attaining color-change effect.

The ignition agent 10 is for burning the smoke-generating agent core grain 9 located in the colored smoke star 5 projected into the air from the projection tube 2 at a desired time to thereby rapidly form a smoke cloud having a desired color in the air in the daytime. The smoke-generating agent core grains 9 may be prepared by forming a smoke-generating agent into a plate-like shape and punching cylindrical grains out thereof by means of a pressing machine or the like, followed by coating the cylindrical grains are with an ignition agent 10.

The smoke-generating agent of which the smoke-generating agent core grain 9 is made comprises an oxidizing agent, a combustible material, a smoke carrying agent, a binding agent, and a colorant.

As the oxidizing agent used in the smoke-generating agent, there may be mentioned potassium chlorate, potassium nitrate and the like. These may be used alone or in combination. In terms of rapid formation of a smoke cloud, it is most preferred to use potassium chlorate alone or a combination of potassium chlorate with potassium nitrate.

As the combustible material used in the smoke-generating agent, there may be mentioned a charcoal powder, carbon black, sulfur and the like. These may be used alone or in combination. In terms of rapid formation of a smoke cloud for a daytime smoke Roman candle, it is most preferred to use a combination of a charcoal powder and sulfur. As the sulfur, there may be used a fine sulfur powder prepared by pulverizing recovered sulfur, a surface-treated sulfur improved in dispersibility or the like, an infusible sulfur, etc.

As the smoke carrying agent used in the smoke-generating agent, there may be mentioned a melamine resin, a stone dust, thiourea, and a talc powder.

Of these, the melamine resin and the stone dust are indispensably used as essential ingredients. To the melamine resin and the stone dust, the thiourea and the talc powder may be added alone or in combination according to the need. The melamine resin is for lowering combustion temperature and burning rate of the smoke-generating agent to give rise to slow incomplete combustion of the smoke-generating agent. The stone dust is for lowering the combustion temperature of the smoke-generating agent and suppressing flames to give rise to incomplete combustion of the smoke-generating agent. The thiourea is used, according to the need, for lowering the combustion temperature of the smoke-generating agent. The talc powder is used, according to the need, for lowering the combustion temperature of the smoke-generating agent and suppressing flames to give rise to incomplete combustion of the smoke-generating agent as in the case of the stone dust.

The binding agent used in the smoke-generating agent is for binding the various ingredients together in formulation of the smoke-generating agent. As the binding agent, a starch paste, a synthetic paste and the like may be mentioned.

The colorant used in the smoke-generating agent is for imparting a desired color to a smoke cloud of the daytime smoke Roman candle. As the colorant, organic pigments are preferred, and dyes are particularly preferred. There is no particular restriction as to the dyes. An appropriate one may be selected from various dyes such as an azo dye, an anthraquinone dye, an indigoid dye, a sulfur dye, a triphenylmethane dye, a pyrazolone dye, a stilbene dye, a diphenylmethane dye, a xanthene dye, an alizarin dye, an acridine dye, a quinoneimine dye (an azine dye, oxazine dye, or thiazine dye), a thiazole dye, a methine dye, a nitro-dye, and a nitroso-compound dye.

As a colorant for imparting a red color to a smoke cloud, there may be mentioned para red, toluidine red, a barium salt of lake red C, a barium salt of lithol red, a calcium salt of lithol red, o-chloro-p-nitroaniline red, lithol rubine, a tungsten salt of rhodamine B, scarlet 2R lake, and pigment scarlet lake.

As a colorant for imparting a purple color to a smoke cloud, a tungsten salt of methyl violet may be mentioned.

As a colorant for imparting a blue color to a smoke cloud, there may be mentioned a tungsten salt of victoria blue, a tungsten salt of peacock blue, and monastral blue.

As a colorant for imparting a green color to a smoke cloud, there may be mentioned malachite green, a tungsten salt of brilliant green-thioflavine, a tungsten salt of brilliant green, and pigment green B.

As a colorant for imparting a yellow color to a smoke cloud, there may be mentioned benzidine yellow, Hansa yellow G, Hansa yellow lOG, and naphthol yellow lake.

As a colorant for imparting an orange color to a smoke cloud, there may be mentioned o-nitroaniline orange, 2, 4-dinitrosoaniline orange, and Persian orange lake.

Now, examples of a specific formulation of the smoke-generating agent are described.

Formulation Example 1 This Example shows a formulation of a smoke-generating agent for forming a red smoke cloud for the daytime smoke Roman candle. In this Example, relative to 100 parts by weight (pbw) of potassium chlorate as the oxidizing agent; 6 pbw of each of charcoal powder and sulfur as the combustible material; 57 pbw of a melamine resin, 26 pbw of a stone dust and 38 pbw of thiourea as the smoke carrying agent; 8 pbw of a rice paste as the binding agent; and 43 pbw of a red color-imparting dye as the colorant were weighed. These (284 pbw in total) were mixed to prepare a smoke-generating agent for forming a smoke cloud of a red color. To carry out performance test, the smoke-generating agent for forming a smoke cloud of a red color was formed into a spherical shape in a known manner, and the surface thereof was coated with an ignition agent to prepare a red-colored smoke star.

As the ignition agent, use was made of one prepared by mixing about 71 pbw of niter, about 11 pbw of sulfur, about 14 pbw of a charcoal powder and about 4 pbw of a rice paste.

Formulation Example 2 This Example shows a formulation of a smoke-generating agent for forming a purple smoke cloud for the daytime smoke Roman candle. In this Example, relative to 100 pbw of potassium chlorate as the oxidizing agent; 6 pbw of each of charcoal powder and sulfur as the combustible material; 57 pbw of a melamine resin, 25 pbw of a stone dust and 38 pbw of thiourea as the smoke carrying agent; 6 pbw of a rice paste as the binding agent; and 48 pbw of a purple color-imparting dye as the colorant were weighed. These (286 pbw in total) were mixed to prepare a smoke-generating agent for forming a smoke cloud of a purple color. In substantially the same manner as in Formulation Example 1, a purple-colored smoke star was prepared.

Formulation Example 3 This Example shows a formulation of a smoke-generating agent for forming a blue smoke cloud for the daytime smoke Roman candle. In this Example, relative to 100 pbw of potassium chlorate as the oxidizing agent; 15 pbw of potassium nitrate as the oxidizing agent; 8 pbw of each of charcoal powder and sulfur as the combustible material; 42 pbw of a melamine resin, 19 pbw of a stone dust and 11 pbw of talc powder as the smoke carrying agent; 4 pbw of a rice paste as the binding agent; and 76 pbw of a blue color-imparting dye as the colorant were weighed. These (283 pbw in total) were mixed to prepare a screening agent for forming a smoke cloud of a blue color. In substantially the same manner as in Formulation Example 1, a blue-colored smoke star was prepared.

Formulation Example 4 This Example shows a formulation of a smoke-generating agent for forming a green smoke cloud for the daytime smoke Roman candle. In this Example, relative to 100 pbw of potassium chlorate as the oxidizing agent; 7 pbw of potassium nitrate as the oxidizing agent; 4 pbw of each of charcoal powder and sulfur as the combustible material; 63 pbw of a melamine resin, 22 pbw of a stone dust, 13 pbw of thiourea and 6 pbw of talc powder as the smoke carrying agent; 4 pbw of a rice paste as the binding agent; and 56 pbw of a green color-imparting dye as the colorant were weighed. These (279 pbw in total) were mixed to prepare a smoke-generating agent for forming a smoke cloud of a green color. In substantially the same manner as in Formulation Example 1, a green-colored smoke star was prepared.

Formulation Example 5 This Example shows a formulation of a smoke-generating agent for forming a yellow smoke cloud for the daytime smoke Roman candle. In this Example, relative to 100 pbw of potassium chlorate as the oxidizing agent; 4 pbw of each of charcoal powder and sulfur as the combustible material; 61 pbw of a melamine resin, 9 pbw of a stone dust, 25 pbw of thiourea and 4 pbw of talc powder as the smoke carrying agent; 7 pbw of a rice paste as the binding agent; and 41 pbw of a yellow color-imparting dye as the colorant were weighed. These (255 pbw in total) were mixed to prepare a smoke-generating agent for forming a smoke cloud of a yellow color. In substantially the same manner as in Formulation Example 1, a yellow-colored smoke star was prepared.

Formulation Example 6 This Example shows a formulation of a smoke-generating agent for forming an orange smoke cloud for the daytime smoke Roman candle. In this Example, relative to 100 pbw of potassium chlorate as the oxidizing agent; 4 pbw of each of charcoal powder and sulfur as the combustible material; 62 pbw of a melamine resin, 9 pbw of a stone dust, 27 pbw of thiourea and 4 pbw of talc powder as the smoke carrying agent; 7 pbw of a rice paste as the binding agent; and 42 pbw of an orange color-imparting dye as the colorant were weighed. These (259 pbw in total) were mixed to prepare a smoke-generating agent for forming a smoke cloud of an orange color. In substantially the same manner as in Formulation Example 1, an orange-colored smoke star was prepared.

The formulations in the above-described Formulation Examples are shown in the following Table. formulation ingredients F.Ex.1 F.Ex.2 F.Ex.3 F.Ex.4 F.Ex.5 F.Ex.6 (oxidizing agent) potassium chlorate 100 100 100 100 100 100 barium nitrate - - 15 7 - - (combustible material) charcoal powder 6 6 8 4 4 4 sulfur 6 6 8 4 4 4 (smoke carrying agent) melamine resin 57 57 42 63 61 62 stone dust 26 25 19 22 9 9 talc powder - - 11 6 4 4 thiourea 38 38 - 13 25 27 (binding agent) rice paste 8 6 4 4 7 7 (colorant for imparting) red color 43 - - - - purple color - 48 - - - blue color - - 76 - - green color - - - 56 - yellow color - - - - 41 orange color - - - - - 42 total 284 286 283 279 255 259 Each of the numerical values in the Table is to be read as parts by weight.

In the following, function of the embodiment of the daytime smoke Roman candle will be described which is constructed as described above.

According to the daytime smoke Roman candle 1 of the embodiment, when the distal end of the fuse 8 located outside the candle body as the projection tube 2 as shown in Fig.1 is lit by means of a match, lighter or the like, the fuse 8 burns toward the inside of the projection tube 2 through the top cover 4. When the combustion of the fuse 8 reaches the colored smoke-producing agent layer 7 proximate to the top cover 4, combustion of the colored smoke-producing agent layer 7 takes place, and consequently, smoke of a desired color and a desired tone pours from the inside toward the outside of the projection tube 2 for a predetermined period of time. At this time, the top cover 4 is released from the projection tube 2. The combustion of the colored smoke-producing agent layer 7 proximate to the top cover 4 in tern initiates combustion of the ignition agent 10 of the colored smoke star 5 proximate to the top cover 4. The rapid combustion of the ignition agent 10 referred to as a quick burning agent (Hayabi) immediately gives rise to combustion of the propellant layer 6 proximate to the colored smoke star 5 to project the colored smoke star 5 proximate to the top cover 4 with the ignition agent 10 burning from the projection tube 2 into the air at a predetermined time. In the colored smoke star 5 projected into the air with the ignition agent 10 burning, the combustion of the ignition agent 10 reaches the smoke-generating agent 9 located therein at a predetermined time to give rise to combustion of the smoke-generating agent 9 placed in the colored smoke star 5. In consequence, smoke of a desired color and desired tone is generated in the air from a predetermined time for a predetermined period of time. The combustion of the propellant layer 6 for projecting the colored smoke star 5 proximate to the top cover 4 into the air in turn gives rise to combustion of the next colored smoke-producing agent layer 7 adjacent to the propellant layer 6. Then, the above-described actions are sequentially repeated. As a result, a plurality of the colored smoke stars 5 disposed in the projection tube 2 are projected into the air in succession at time intervals sequentially from the uppermost colored smoke star. By virtue of this, it is possible to sequentially produce smoke clouds of desired colors in the air.

As described above, the colored smoke stars 5 are prepared using the smoke-generating agents 9 of the present invention, and the daytime smoke Roman candle 1 according to this embodiment is prepared using the colored smoke stars 5. Accordingly, by lighting the fuse, smoke clouds of desired colors sequentially pour from the projection tube 2 to the diurnal air, and the colored smoke stars 5 are sequentially projected in succession at time intervals into the diurnal air. In consequence, smoke clouds of desired colors for enjoyment can sequentially be formed with ease in the diurnal air.

Incidentally, the daytime Roman candle may have such a structure that a single colored smoke star 5 in the form as in this embodiment is projected.

The colored smoke stars 5 for the various colors which had been prepared using the above-described formulations of the smoke-generating agent were sequentially placed in the projection tube 2 in such a manner that each of the colored smoke stars is interposed between a colored smoke-producing agent layers 7 and a propellant layers 6, thereby preparing the daytime smoke Roman candle 1. The colored smoke stars were projected into the diurnal air to examine whether smoke clouds can be formed or not and, if generated, to visually evaluate color tones of the smoke clouds or the like.

As a result, each of the colored smoke stars according to the Formulation Examples was found to be capable of appropriately forming a smoke cloud of a desired color in the diurnal air with ease as a toy firework.

Fig. 3 shows a second embodiment of the daytime smoke Roman candle employing the smoke-generating agents according to the present invention.

In the daytime smoke Roman candle 1A of this embodiment, no colored smoke-producing agent layers 7 are placed in a projection tube2 as distinct from the daytime smoke Roman candle 1 of the above-described first embodiment. Instead of each colored smoke-producing agent layer 7, a layer of an isolating material 11 such as pelletized soil is placed in the projection tube 2 in such a manner that colored smoke stars 5 are isolated from each other in the projection tube 2 in the axial direction of the projection tube 2. Under each of the colored smoke stars 5, a propellant layer 6 for projecting the corresponding colored smoke star 5 is placed. In the projection tube 2, a fuse 8A is so placed as to extend in the longitudinal direction of the projection tube 2 along an inner surface of the projection tube 2. The fuse 8A is in contact with each of the propellant layers 6 of all the colored smoke stars 5. The fuse 8A has its distal end located outside the projection tube 2 via a top cover 4. With the exception thereof, the second embodiment has substantially the same structure as that of the above-described first embodiment.

According to the daytime smoke Roman candle 1A of this embodiment constructed as described above, when the distal end of the fuse 8A leading into the outside of the projection tube 2 is lit by means of a match, lighter or the like, the fuse 8A burns toward a bottom 3 in the projection tube 2 through the top cover 4. When the combustion of the fuse 8A reaches the uppermost colored smoke star 5 proximate to the top cover 4, rapid combustion of an ignition agent 10 of the uppermost colored smoke star 5 takes place. The combustion of the ignition agent 10 in turn immediately initiates combustion of the propellant 6 for the uppermost colored smoke star 5 which is placed under the uppermost colored smoke star 5 to project the uppermost colored smoke star 5 with the ignition agent 10 burning from the projection tube 2 into the air. At this time, the top cover 4 is released from the projection tube 2. In the colored smoke star 5 projected into the air with the ignition agent 10 burning, the combustion of the ignition agent 10 reaches the smoke-generating agent core grain 9 located therein to give rise to combustion of the smoke-generating agent 9 at a predetermined time. In consequence, a smoke cloud of a desired color is formed at a predetermined time. Posterior to the combustion of the propellant 6 for the uppermost colored smoke star 5 proximate to the top cover 4, the combustion of the fuse 8A gives rise to combustion of an ignition agent 10 of the colored smoke star 5 subsequent to the uppermost colored smoke star 5 which was projected into the air. While the ignition agent 10 is burning, the fuse 8A continues to burn, and the combustion of the fuse 8A initiates combustion of a propellant 6 located under the subsequent colored smoke star 5 to project the subsequent colored smoke star 5 from the projection tube 2 into the air with the ignition agent 10 burning. In the colored smoke star 5 projected into the air with the ignition agent 10 burning, the combustion of the ignition agent 10 reaches the smoke-generating agent core grain 9 located therein to give rise to combustion of the smoke-generating agent 9 at a predetermined time. In consequence, a smoke cloud of a desired color is formed at a predetermined time. Then, the above-described actions are sequentially repeated. As a result, a plurality of the colored smoke stars 5 disposed in the projection tube 2 are projected into the air substantially in succession at desired time intervals sequentially from the uppermost colored smoke star. By virtue of this, it is possible to sequentially produce smoke clouds of desired colors in the air.

According also to the daytime smoke Roman candle 1A of the second embodiment as described above, substantially the same effect as in the daytime smoke Roman candle 1 of the first embodiment can be obtained.

A further modification of the embodiment in Fig.l is shown in Fig.4 as a third embodiment of the present invention. The daytime smoke Roman candle 1B of this embodiment has such a structure that the top cover 4 and the fuse 8 are removed from the embodiment in Fig. 1, and accordingly, the smoke-producing agent layer 7 over the uppermost colored smoke star 5 is directly lit with a lighter or the like. Instead of the smoke-producing agent layer 7, there may be used a rise to ignition.

Further, if the colored smoke star comprises a core grain in a multi-layer structure which is made of layers of a plurality of smoke-generating agents capable of forming colored smoke clouds having different colors, colored smoke clouds of a plurality of colors sequentially appear in the air when one colored smoke star is projected.

Claims

WBAT IS CLAIMED IS:

1. A daytime smoke Roman candle comprising: a projection tube, a plurality of colored smoke stars capable of generating colored smoke by combustion, said colored smoke stars being placed in said projection tube at intervals in the longitudinal direction of said projection tube, colored smoke-producing agent layers placed over said colored smoke stars, respectively, a propellant layer placed under each of said colored smoke stars, and a fuse introduced into the colored smoke-producing agent layer for the uppermost colored smoke star.

2. A daytime smoke Roman candle comprising: a projection tube, a plurality of colored smoke stars capable of generating colored smoke by combustion, said colored smoke stars being placed in said projection tube at intervals in the longitudinal direction of said projection tube, a propellant layer placed under each of said colored smoke stars, non-combustible material layers each interposed between the propellant layer and the colored smoke star subsequent thereto, and a fuse extending in the projection tube along the longitudinal direction of the projection tube so as to be in contact with each propellant.

3. A daytime smoke Roman candle comprising: a projection tube, a plurality of colored smoke stars capable of generating colored smoke by combustion, said colored smoke stars being placed in said projection tube at intervals in the longitudinal direction of said projection tube, colored smoke-producing agent layers placed over said colored smoke stars, respectively, a propellant placed under each of said colored smoke stars, and an ignition agent placed over the colored smoke-producing layer for the uppermost colored smoke star for ignition of the colored smoke-producing agent layer.

4. The daytime smoke Roman candle according to any one of claims 1 to 3, wherein each of said colored smoke stars comprises a smoke-generating agent core grain coated with an ignition agent.

5. The daytime smoke Roman candle according to any one of claims 1 to 4, wherein said colored smoke star comprises a core grain in a multi-layer structure which is made of layers of a plurality of smoke-generating agents capable of generating smoke of different colors by combustion.