JP3564447B2 - cracker - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an improvement in a cracker in which an explosive explodes due to a pulling operation of a drawstring, and the explosion expels an object to be discharged such as a lightweight paper tape into the air.
[0002]
[Prior art]
As shown in FIG. 4, as this type of cracker, a blast of an explosive 3 is applied to the inside of a cylindrical body 1 and fired, and the object 1 collides with an object 9 such as a piece of paper or a small-wound tape. (Also referred to as a pressure receiving body) 20 for causing the air to flow from the discharge port 2. The feeder 20 is a cylindrical body made of foamed plastic. Since the outer surface 220a of the cylindrical feed body 20 comes into surface contact with the inner surface of the cylindrical body 1, the cylindrical feed body 20 has a cylindrical shape like a flat pressure receiving plate commonly called a footed pan or a round pan. There is no slanting in the tubular body 1 unlike a line contact with the inner surface of the tubular body 1. Therefore, the cylindrical feeder 20 has an advantage that it can move straight and stably along the axis X of the tubular body 1 even when a large amount of the discharge target 9 is blown, as compared with a flat pressure receiving plate. .
[0003]
The cylindrical feeder 20 is press-fitted into the cylindrical body 1, and the outer peripheral surface 20 a of the feeder 20 is housed in a press-contact engagement state with the inner surface of the cylindrical body 1. This is to prevent the blast pressure of the explosive 3 from leaking from between the inner surface of the cylindrical body 1 and the outer peripheral surface 20a of the feeder 20 so as to increase the pressure receiving efficiency of the feeder 20.
[0004]
[Problems to be solved by the invention]
However, in the above-described cracker that accommodates the cylindrical feeder 20 in a press-contact engagement state with the inner surface of the cylindrical body 1, the cylindrical body 1 is formed in a parallel cylindrical shape having the same diameter over the entire length in the front-rear direction. Meanwhile, frictional resistance continues to be generated between the contact surface with the inner surface of the tubular body 1 on the way until the sending body 20 receives the explosive force of the explosive 3 and jumps out of the discharge port 2. For this reason, the speed of the feed body 20 decreases, and the collision force applied to the discharge target 9 is attenuated by the deceleration, so that it is impossible to fly a large amount of the discharge target 9 far. On the other hand, if the amount of explosive is increased in order to fly the object 9 far away, there is a danger and a problem in the Explosives Control Law arises.
[0005]
Therefore, an object of the present invention is to solve such a problem, so that the above-described deceleration problem can be solved while increasing the pressure receiving efficiency of the cylindrical or prismatic feeder as described above, An object of the present invention is to provide a cracker capable of flying a large amount of discharged material as far as possible with a small amount of explosive. Another object of the present invention is to provide a cracker that can protect a feeder from explosive pieces and explosive heat of an explosive by using a pressure receiving plate that directly receives the explosive energy of the explosive.
[0006]
[Means for Solving the Problems]
The present invention is directed to an explosive seat that sequentially explodes from the rear to the front inside a tubular body having a discharge port at the front end, explosives that explode by pulling a pull cord, and receiving the explosive energy of this explosive, the direction of the discharge port. In a cracker provided with a cylindrical or prismatic feeder to be fired toward, and an object to be discharged which is blown toward the discharge port in response to the collision of the feeder, the feeder is press-fitted into the tubular body. The outer periphery of the feeder is pressed into engagement with the inner surface at a predetermined position in front of the explosive in the tubular body, and the tubular body has a slope of at least 0.2 in front of the forwardly engaged position of the feeder. It is characterized in that it is formed in a tapered shape which is set to about 5 ° and gradually expands forward.
[0007]
In this case, a pressure receiving plate that directly receives the explosive energy of the explosive can be provided between the sending body in the cylindrical body and the explosive. Further, the pressure receiving plate can be formed of a material that can withstand an explosive impact more than the feeder.
[0008]
[Action]
According to the cracker having the above configuration, the feed body is press-fitted into the cylindrical body and press-fits to the inner surface of the cylindrical body at a predetermined position. The blast pressure of the explosive does not leak from between, and the pressure receiving efficiency is improved. In addition, since the cylindrical body is formed in a tapered shape which gradually expands forward at least by setting the gradient near the front of the feed body to be in pressure contact with the feed body at 0.2 to 5 °, Even if the feeder is initially in pressure contact with the inside of the body, it is temporarily disengaged from the inner surface of the cylinder and moves slightly forward by the explosive force of the explosive. Since a gap is formed between the discharge ports, they are quickly fired forward at the initial velocity without frictional resistance, hit the discharge target, and discharge the discharge target from the discharge port. Thus, at the time of the explosion, the feed body is blown off without maintaining the frictional resistance with the inner surface of the cylindrical body, so that the explosive force can be sufficiently utilized even when the amount of the explosive is small. Therefore, since the feeder can increase the pressure receiving efficiency and the firing efficiency, the feeder can shoot straight and vigorously along the axis of the cylindrical body, and can fly a large amount of dischargeable substances as far as possible.
[0009]
Since the pressure receiving plate is installed between the feeder and the target, the feeder is not deformed, damaged or damaged by explosives or explosive heat of the explosive, and the transmitter explodes on the target. The power can be transmitted effectively, and the function of flying the object to be discharged is surely exhibited.
[0010]
If the pressure receiving plate is formed of a material that can withstand an explosion impact more than the feeder, the feeder can be sufficiently protected from explosive pieces and explosive heat of explosives.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
A preferred embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of a cracker showing one embodiment of the present invention, and FIGS. 2 and 3 are sectional views of crackers showing another embodiment.
[0012]
The cracker according to the present invention, as shown in FIG. 1, forms a cylindrical body 1 in a tapered cylindrical shape of a cone or a pyramid that gradually expands from the rear to the front with plastic, cardboard, or the like. To form The inclination of the taper is set to 0.2 to 5 °, more preferably 0.5 to 3 °. An inner rear end of the cylindrical body 1 is formed in a conical shape, and an explosive receiving seat 4 for receiving and supporting an explosive 3 called a pulling ball is integrally provided, and a drawstring 5 passed through the explosive 3 is passed through. A drawstring hole 6 is formed in the explosive receiver 4. The explosive receiver 4 may be formed separately from the cylindrical body 1 into a U-shaped cross section (see FIG. 4), a V-shaped section, or the like.
[0013]
In front of the explosive 3 in the cylindrical body 1, the feeder 7 and the pressure receiving plate 8 are accommodated and arranged in front and rear. The feeder 7 is made of a material such as foamed plastic, non-foamed plastic, cork, wood, or pulp material, and has a cylindrical or prismatic shape having a thickness several times larger than the pressure receiving plate 8 (for example, about 10 mm). It is formed. The feeder 7 is formed to have a diameter slightly larger than the inner diameter of a predetermined position at a predetermined distance from the explosive 3 in the cylindrical body 1, is press-fitted from the front of the cylindrical body 1, and is provided on the inner surface at the predetermined position. 7 is housed in a state where the outer periphery of the same 7 is in pressure contact engagement.
[0014]
The pressure receiving plate 8 is formed in a flat plate shape from a material such as cardboard or plastic, but is formed to have a diameter slightly larger than the inner diameter at a predetermined position at a predetermined distance from the explosive 3 in the cylindrical body 1. 1 is press-fitted from the front, and the outer periphery of the pressure receiving plate 8 is pressed into engagement with the inner surface at the predetermined position or is housed in a non-pressed state.
When the feeder 7 is made of a material such as non-foamed plastic, cork, wood, or the like, the pressure receiving plate 8 is not necessarily required because the explosive pieces and explosive heat of the explosive 3 are less likely to cause deformation, breakage, or damage. And can be omitted. However, when the material of the feed body 7 is easily deformed, broken or damaged by explosive pieces or explosive heat of the explosive 3 such as foamed plastic, the pressure receiving plate 8 is more resistant to explosion impact. The feeder 7 is formed of a material to be obtained, for example cardboard or non-foamed plastic, to protect the explosive 3 from explosive pieces and heat. The pressure receiving plate 8 and the feeder 7 may be bonded, adhered, or fused to each other, or may be bonded, adhered, or fused in advance.
[0015]
A discharge object 9 such as a piece of paper or a small tape is accommodated between the feeder 7 and the discharge port 2 in the tubular body 1. In the illustrated example, the discharge port 2 of the cylindrical body 1 is closed by loosely engaging the front cover 10 formed separately from the cylindrical body 1 into the discharge port 2. In the case of a tubular member, a flap-shaped front lid may be integrally connected to the front end of the tubular body 1 or to the exterior paper of the tubular body 1 so as to be freely bent, and this can be folded so as to close the discharge port 2 (FIG. 4).
[0016]
In the above embodiment, the tubular body 1 is formed in a tapered tubular shape that gradually expands from the rear to the front, but as shown in FIG. A tapered portion 1a that gradually expands forward by a certain distance from is formed, and a front portion 1b from the front end of the tapered portion 1a may be formed in a parallel cylindrical shape. Further, the rear portion 1c of the cylindrical body 1 from the position where the press-fitting engagement of the feed body 7 is engaged to the explosive receiver 4 may be formed in a parallel cylindrical shape as shown in FIG.
[0017]
In the cracker having the above-described configuration, when the pull cord 5 led out from the draw string through hole 6 is pulled backward to explode the explosive 3, the feeder 7 receives the explosive energy of this explosive directly or via the pressure receiving plate 8, and the discharge port 2, the object 9 collides with the object 9 to be ejected, and the object 9 is pushed into the air as soon as the object 9 is pushed out of the front cover 10 to open the discharge port 2.
[0018]
At that time, since the feeder 7 is press-fitted into the tubular body 1 and is pressed into engagement with the inner surface of the tubular body 1 before firing, the blast pressure of the explosive 3 is instantaneously exploded. There is no leakage between the inner surface, and the blast pressure can be efficiently received to fly.
Since the cylindrical body 1 is formed in the above-mentioned tapered shape in which at least the vicinity of the front where the press-fitting engagement of the feed body 7 is gradually expanded toward the front, the feed body 7 is initially formed inside the cylindrical body 1. , Even when the pressure contact engagement is performed, a gap is formed between the inner surface of the cylindrical body 1 and the moment when the engagement with the inner surface of the cylindrical body 1 is released once the explosive 3 explodes, so that the initial speed is maintained without frictional resistance. It can be quickly fired forward, hit the object 9 and fly the object 9 far from the outlet 2.
[0019]
The pressure receiving plate 8 prevents the feeder 7 from being deformed, broken, or damaged by explosive fragments or explosive heat of the explosive 3, so that the feeder 7 stabilizes the function of rapidly blowing the object 9 forward. Demonstrate. When the pressure receiving plate 8 is in pressure contact with the inner surface of the cylindrical body 1, as in the case of the feeder 7, the moment when the engagement with the inner surface of the cylindrical body 1 is once released with the explosion of the explosive 3. As a result, a gap is formed between the inner surface of the cylindrical body 1 and the inner wall of the cylindrical body 1 so that it can be quickly fired without frictional resistance.
[0020]
The feed body 7 is formed in a hollow cylinder or a prism having a concave cross section having a flat head portion 7a and a skirt portion 7b as shown in FIG. 2 in addition to a solid cylinder or a prism. You can also. According to the feeder 7 having this shape, the pressure receiving area can be made wider than that of the solid cylindrical or prismatic feeder 7, which is advantageous.
Note that the cracker having the above-described configuration is not limited to a single-cylinder type, and can be similarly applied to a multiple-tube type in which a plurality of pieces are integrally set.
[0021]
【The invention's effect】
According to the present invention, the feeder is press-fitted into a tapered tubular body that gradually expands as it reaches the front and is pressed into engagement with a predetermined position in the tubular body corresponding to the front of the explosive. Pressure can be increased, and there is no frictional resistance between the inner surface of the cylinder and it can be fired vigorously at the initial velocity, with a large amount of explosives flying as far as possible with a small amount of explosives. Can be. Further, the pressure receiving plate has an advantage that the feeder can be well protected from explosive pieces and explosive heat of explosives.
[Brief description of the drawings]
FIG. 1 is a sectional view of a cracker showing one embodiment of the present invention.
FIG. 2 is a sectional view showing another embodiment.
FIG. 3 is a sectional view showing still another embodiment.
FIG. 4 is a sectional view of a conventional cracker.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cylindrical body 2 Discharge port 3 Explosive 4 Explosive pedestal 5 String 7 Sending body 8 Pressure receiving plate 9 Object to be discharged 10 Front cover

Claims (3)

Inside a cylindrical body having a discharge port at the front end, an explosive seat is sequentially exploded from the rear to the front, an explosive that explodes by pulling a pull cord, and is fired in the direction of the discharge port by receiving the explosive energy of this explosive. Cylinder or prismatic feeder, in a cracker provided with a target to be ejected in the direction of the discharge port in response to the collision of the feeder,
The feeder is press-fitted into the tubular body, and the outer periphery of the feeder is pressed into engagement with the inner surface of the cylindrical body at a predetermined position in front of the explosive in the tubular body, and the tubular body is at least a part of the feeder. A cracker characterized in that it is formed in a tapered shape in which a gradient near the front to be pressed and engaged is set to 0.2 to 5 ° and gradually widens forward. 2. The cracker according to claim 1, wherein a pressure receiving plate that directly receives explosive energy of the explosive is provided between the sending body in the cylindrical body and the explosive. 3. The cracker according to claim 2, wherein the pressure receiving plate is formed of a material that can withstand an explosion impact more than the feeder.

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