JPH1151597A - Cracker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance safety in handling by providing a cover continuously to the front edge of a tubular body through a folding line to produce a plurality of flaps turned down sequentially from the folding line toward the center of a launching port, and an integrated linking pieces turned down along the folding line between the overlapping faces of the flaps thereby preventing the inverting phenomenon of the flap. SOLUTION: A tube and a cover 3 are assembled of a sheet of paper board 8 punched into sectral shape as a whole. The board 8 comprises sectral plates 9 continuous through arcuate folding lines 11 with adjacent flaps 10, 10 being linked integrally through a triangular integral linking piece 12. Each flap 10 is formed into a substantially trapezoid having a set of opposite sides comprising the arcuate folding line 11 and a narrower front edge 10a, and the other set of opposite sides comprising the left and right edges 10b, 10c abutting on the left and right integral linking piece 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cracker which is used for a feast such as a Christmas or wedding ceremony and which makes an explosion sound by pulling a drawstring.

[0002]

2. Description of the Related Art A cracker of this type is disclosed, for example, in Japanese Utility Model Publication No. 63-19754. As shown in FIG. 9, a firing port 2 is formed at the front end of a conical cylindrical body 1, and the firing port 2 is closed with a cover 3 that can be opened. Although not shown, a pyrotechnic body is housed inside the cylindrical body 1, and a drawstring passed through the explosive body is led out from a rear end hole of the cylindrical body 1, and the pullstring is strongly pulled so that the explosive is charged. The body explodes, and the explosion pressure causes the lid 3 to open like a petal.

[0003]

However, the cracker has a plurality of petal-like flaps 1 on the front edge of the cylindrical body 1.
0 are continuously provided via a fold line 11, and the flaps 10 are sequentially folded to form an openable lid 3. A V-shaped notch 2 is provided between adjacent flaps 10, 10.
0, and each flap 1
Numerals 0 are separated from each other on the front edge of the cylindrical body 1 and arranged independently. For this reason, when the flap 10 in the folded state is opened as indicated by a two-dot chain line in the figure due to the explosive pressure of the explosive, the flap 10 does not stop expanding straight ahead of the cylindrical body 1 but becomes larger. An inverted state opens at an angle (the flap 10 in the inverted state is indicated by a symbol A). Such an inversion phenomenon of the flap 10 is also likely to occur when the inner rear end 20a of the cut 20 is torn by the explosive pressure of the explosive. When the flap 10 is inverted in this way, there is a problem that at this moment, the finger gripping the front end side of the cracker is hit with the inverted flap A to give a painful feeling. As one of the measures, it is conceivable to prevent the reversal phenomenon of the flap 10 by lowering the explosive power of the explosive.
In this case, a satisfactory explosion sound cannot be obtained, and in the case where an ejected material such as a small wrapping tape to be blown off by the explosion of the explosive is stored in the cylinder 1, the flying distance of the ejected material is shortened. Occurs.

An object of the present invention is to solve such a problem, and a cracker which can prevent the flap reversal phenomenon and improve the handling safety without lowering the explosive power of the explosive body. To provide.

[0005]

According to the present invention, a firing port is formed at the front end of a cylindrical body, and the firing port is closed by a lid so as to be openable, and a pyrotechnic body is stored in the cylindrical body. A cracker which draws out a drawstring passed through the explosive body from a rear end hole of the cylindrical body, and the explosive body explodes by pulling operation of the drawstring, and the lid is opened by the explosion pressure. In the above, the lid is connected to the front end edge of the cylindrical body via a fold line, and a plurality of flaps sequentially folded from the fold line toward the center of the firing port, and adjacent flaps through the fold line. And an integral connecting piece folded along the fold line between the overlapping surfaces of the flaps.

[0006]

[Function] The sequentially folded flaps are released all at once by the explosive pressure of the explosive, but at this time, the flaps are connected integrally with the connecting piece, so that each flap is straight ahead of the cylinder. Just by unfolding, further opening and reversing beyond that is reliably regulated by the integral piece.

[0007]

FIG. 1 is a longitudinal sectional view of a cracker showing one embodiment of the present invention, FIG. 2 is a perspective view of the cracker, and FIG. 3 is a perspective view showing the cracker opened by explosion. FIG. 4 is a developed plan view of a cylinder and a lid of the cracker. As shown in FIG. 1, the cracker forms a firing port 2 at the front end of a conical cylindrical body 1 having a large diameter as it goes forward, and closes the firing port 2 with a lid 3 so as to be openable. In the cylindrical body 1, an explosive body 4 and a cord 5 passed through the explosive body 4,
And a funnel-shaped explosive body receiving seat 6 movably inserted behind the explosive body 4 of the drawstring 5. The rear end of the drawstring 5 extending rearward from the explosive body receiving seat 6 is led out of the rear end hole 7 of the cylindrical body 1 to the outside.

The cylindrical body 1 and the lid 3 are assembled from a single paper substrate 8 which is entirely punched out in a substantially fan shape as shown in a developed state in FIG. The substrate 8 has a plurality of flaps 10 connected to the arc-shaped front edge of the sector plate 9 via arc-shaped fold lines 11, respectively.
Triangular integral connecting piece 1 with 0 and 10 spread forward
It is connected by two. Each flap 10 has an arc-shaped fold line 11 and a front edge 10 a having a width smaller than the fold line 11.
Are formed as a pair of opposite sides, and the left and right end edges 10b and 10c connected to the left and right integral connecting pieces 12 are formed in a substantially trapezoidal shape as another pair of opposite sides. It is preferable that the right edge 10c substantially coincides with a line L passing through a center portion O that draws an arc of the front edge of the sector plate 9. Fold lines 13 and 14 are provided on the left and right edges 10b and 10c of the flap 10 connected to the integral connecting piece 12.
Is provided. It is preferable from the viewpoint of the assembling process that the fold line 13 of the left edge 10b is more easily bent by forming a perforation or one long cut. A glue allowance 15 is continuously provided on the left and right end edges 9a of the fan-shaped plate 9.

In order to assemble the substrate 8 punched into such a shape, the flaps 10 are folded inward in the order of numbers,..., Via a fold line 11, and the integral connecting piece 12 is connected to the flaps 10, 10. While folding along the fold lines 13 and 14 between the overlapping surfaces, the fan-shaped plate 9 is conically wound to form the cylinder 1, and finally the lid 3 is formed by closing the firing port 2 by pushing the cylinder 1 into the cylinder 1. You. that time,
As shown in FIG. 4, when a notch 16 is provided with a step between the front edge 10 a of each flap 10 and the front edge 12 a of the integral connecting piece 12, the flap 10 and the integral connecting piece 1 are provided.
As shown in FIG. 2, each notch 1
6 engage with each other at the center of the firing port 2, and this engagement can prevent the flap 10 from being opened carelessly.
After the fan-shaped plate 9 is wound in a conical shape, the glue allowances 15 at the left and right end edges 9a are overlapped and glued inside the other end edge 9b. Prior to such assembling, the explosive body 4, the drawstring 5, and the explosive body receiving seat 6 are arranged on the sector plate 9 in advance. that time,
A spout (not shown) such as a small tape may be arranged in front of the explosive 4.

In order to use the cracker having the above structure, when the pull cord 5 is strongly pulled, the explosive body receiving seat 6 moves to the rear of the cylinder 1 which is narrowed down at the rear end of the explosive body 4 and stops. ,
At this point, the cord 5 is exploded at the same time that the cord 5 is pulled out from the powder body 4. The flap 10 is opened by this explosion pressure, but since the flaps 10 and 10 are connected together by the connecting piece 12, the flap 10 is straightened forward of the cylindrical body 1 as shown by a two-dot chain line in FIG. 1 and FIG. It just expands and there is no such thing that it opens wider and flips. Therefore, there is no possibility that the finger gripping the front end side of the cracker is hit with the reversing flap as in the related art, and the device can be used safely.

The integral connecting piece 12 for connecting the flaps 10, 10 may be formed into a shape as shown in FIGS. In this case, the integral connecting piece 12 is integrally formed like a bridge between the adjacent flaps 10, 10, and a triangular hole 18 is provided between the flaps 10, 10 and the integral connecting piece 12. According to this, since the integral connecting piece 12 is easily folded along the fold lines 13 and 14, it is easy to fold between the overlapping surfaces of the flaps 10 and 10.

Further, the integral connecting piece 12 may be formed in a shape as shown in FIGS. In this case, the integral connecting piece 12 is formed in a triangular shape that fills only the space between the skirts of the adjacent flaps 10, 10. In this case, as the flap 10 and the integral connecting piece 12 are sequentially folded, the notch 16 which engages with each other at the center of the firing port 2 has a small protrusion 17 at the left end edge 10b of the flap 10.
Is formed.

In each of the embodiments, the cylindrical body 1 is formed in a conical shape, but may be formed in a pyramid shape such as a pentagon or a hexagon according to the number of the flaps 10. The winding edges of the cylindrical body 1 may be stapled or the like instead of gluing. The cylinder 1, the flap 10 and the connecting piece 12 may be made of plastic instead of paper.

[0014]

According to the cracker of the present invention, the reversal of the flap can be prevented without lowering the explosive power of the explosive. Therefore, there is no possibility that a finger gripping the front end side of the cracker is hit by the reversing flap as in the conventional case, and it can be used safely and is advantageous.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a cracker showing one embodiment of the present invention.

FIG. 2 is a perspective view of the same cracker.

FIG. 3 is a perspective view showing an open state of the cracker after an explosion.

FIG. 4 is a developed plan view of a cylinder and a lid of the cracker.

FIG. 5 is a developed plan view of a cylinder and a lid of a cracker showing another embodiment of the present invention.

FIG. 6 is a perspective view showing an open state after the explosion of the cracker.

FIG. 7 is a developed plan view of a cylinder and a lid of a cracker showing still another embodiment of the present invention.

FIG. 8 is a perspective view showing an open state of the cracker after explosion.

FIG. 9 is a perspective view showing a part of a conventional cracker.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylindrical body 2 Firing opening 3 Lid 4 Explosive body 5 Pull cord 7 Back end hole 10 Flap 11 Fold line 12 Integral joint piece 13, 14 Fold line

Claims (1)

[Claims] 1. A firing port is formed at the front end of a cylindrical body, and the firing port is closed so as to be openable with a lid. The explosive body is housed in the cylindrical body and passed through the explosive body. A cracker in which the drawn string is led out from the rear end hole of the cylindrical body, and the explosive body explodes by pulling the string, and the lid is opened by this explosion pressure. And a plurality of flaps which are connected to the front end of the flap through a fold line and are sequentially folded from the fold line toward the center of the opening, and the adjacent flaps are integrally connected via the fold line to form a flap. A cracker comprising an integral joint piece folded along the fold line between two overlapping surfaces.