JPH0413120B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a cutting blade, and more specifically,
When cutting the strip by sliding it forward along the inner circumferential surface of the cylindrical case, the strip is designed to be able to completely separate the cut strip even if a torn piece is generated at the cut end. This invention relates to a cutting blade that can cut the body.

[Prior Art] Conventionally, various objects have been cut using pincers, push-cuts,
There are cutters and others, but they all require a lot of human power and are difficult to cut instantly.

In view of the above circumstances, the inventor has made efforts to develop a strip cutting device that can reliably cut strips, such as strings, ropes, wires, etc., instantaneously and with great force. As a result, as shown in FIG. 2, a gas generating agent (not shown) slides on the inner peripheral surface of the cylindrical case 1 due to the pressure of the gas generated by the gas generating agent, and A cutting device 4 has been developed in which a cutting blade 2 that moves forward is arranged, and a strip insertion hole 3 is opened in front of the cutting blade 2 and on the circumferential side of the cylindrical case 1. As shown in FIG. 3, the cutting blade 2 has a cylindrical shape, and a recess 5 is formed on the tip surface thereof from the tip edge toward the center, so that the tip edge becomes a sharp blade 6. It is configured. Then, the cutting device 4 inserts the strip 7 into the strip insertion hole 3, and instantaneously moves the cutting blade 2 forward by the high pressure of the gas generated by the gas generating agent. The strip 7 can be cut by the blade 6 formed by the tip edge and the inner peripheral surface of the cylindrical case 1 based on the principle of push-cutting.

[Problems to be Solved by the Invention] However, when the strip 7 is pressed with the cutting blade 2, a torn piece 8 is generated on the cutting blade of the strip 7, and this torn piece 8 is removed from the cutting blade 2. Being sandwiched between the circumferential side and the inner circumferential surface of the cylindrical case 1, the forward movement of the cutting blade 2 is obstructed and the strip 7 that should have been cut cannot be separated from the cylindrical case 1. It turned out to be gone.

[Means for Solving the Problems] The present invention has been made based on the above-mentioned circumstances, and the cylindrical body slides forward on the inner circumferential surface of the cylindrical case. The blade formed on the tip edge completely cuts the strip inserted into the strip insertion hole opened in the cylindrical case, and the forward movement of the cutting blade is obstructed by the pieces of the cut strip. It is an object of the present invention to provide a cutting blade that prevents the strip that is supposed to be cut from becoming impossible to separate from the cylindrical case.

The outline of this invention for achieving the above object is as follows:
The cutting blade of the cylindrical body, which is disposed in the cylindrical case so as to be able to slide the inner peripheral surface of the cylindrical case having a slit insertion hole through which the cylindrical body is inserted, by gas pressure, A blade formed on the front end edge by recessing the front end face of the body toward the center from the front end edge, and a close contact provided on the front end face side that slides in close contact with the inner peripheral surface of the cylindrical case. The first sliding surface and the second sliding surface provided on the rear end surface side of the cylindrical body.
A width larger than the diameter of the strip insertion hole is provided between the circumferential side, the first close sliding circumferential side, and the second close sliding circumferential side so as to circulate around the circumferential side of the cylindrical body. The cutting blade is characterized by having a recess formed therein.

Next, the present invention will be explained with reference to the drawings.

A cutting blade 10 according to the present invention is slidably disposed within a cylindrical case 11, as shown in FIG. The cylindrical case 11 may have a cylindrical shape or a rectangular cylindrical shape, but is preferably cylindrical in view of ease of processing.

This cylindrical case 11 has opposing strip insertion holes 13 at appropriate locations on its circumferential surface, and the strips 14 are passed through from one strip insertion hole 13 to the other strip insertion hole 13. Accordingly, this cylindrical case 11
The strip 14 can be attached perpendicularly to the.

The cutting blade 10 disposed inside the cylindrical case 11 is a front end of a cylindrical body having a first circumferential sliding surface 32 and a second circumferential surface 32 that come in close contact with the inner surface of the cylindrical case 11. By recessing the surface from the front end edge 15 toward the center of the front end surface, a concave portion 16 is formed in the front end surface, and the front end edge 15
A sharp blade 17 is formed on the edge. This cutting blade 10 is
In FIG. 1, it is formed into a cylindrical body, but if the cylindrical case 11 is a rectangular cylinder, it must be formed into a rectangular cylinder. This is because the front edge 1
The strip 14 is inserted into the strip insertion hole 13 using the principle of push-cutting using the blade 17 of No. 5 and the inner peripheral surface of the cylindrical case 11.
In order to cut the cylindrical case 11, the front edge 15 needs to follow the inner peripheral surface of the cylindrical case 11. Further, the first circumferential surface 32 of the cylindrical body in this cutting blade 10 and the second circumferential surface 32 of the cylindrical body are connected to the cylindrical case 1.
The reason why the cutting blade 10 is placed in close contact with the inner circumferential surface of the cutting blade 10 is to prevent the gas generated from the gas generating agent from leaking out, and to efficiently cut the strip by the cutting blade 10 using the high pressure gas generated by the gas generating agent. This is to make it possible to cut 14.

The cutting blade 10 has a cylindrical body that slides in close contact with the first
A recess 18 having a width larger than the diameter of the strip insertion hole 13 and extending around the circumferential side is formed between the circumferential side 32 and the second closely sliding circumferential side. The reason why the width of the recess 18 is made larger than the width of the strip insertion hole 13 is that the tear piece 19 (see FIG. 5) generated at the cut end of the cut strip 14 is
This is to prevent the cutting blade 10 from being pinched between the circumferential side surface of the cylindrical body and the inner circumferential surface of the cylindrical case 11.

[Function] The cutting blade 10 configured as described above can cut the strip 14 in the following manner.

That is, when high-pressure gas is generated from a gas generating agent (not shown) by an appropriate means, the cylindrical body forming the blade 17 on the front edge 15 instantly slides forward due to the high-pressure gas. As the cylindrical body slides forward, the blade 17 formed on the front edge 15 passes through the inner circumferential surface of the cylindrical case 11 that opens the strip insertion hole 13, thereby realizing the principle of push-cutting. Accordingly, the strip 14 inserted into the strip insertion hole 13 is instantaneously cut by the blade 17.
Even if a torn piece 19 is generated at the cut end of the strip 14 during cutting, this torn piece 19 will be separated from the close sliding first circumferential side surface 32 and the close sliding second circumferential side of the cutting blade 10 moving forward. Since it fits into the recess 18 formed between the cutting blade 10 and the side surface, it is not pinched between the circumferential side surface of the cutting blade 10 and the inner circumferential surface of the cylindrical case 11. Therefore, the strip 14 cut by the cutting blade 10 can be completely separated from the cylindrical case 11.

[Example] Next, an example of the present invention will be shown to specifically illustrate the present invention.

As shown in FIG. 6, near one end of the hollow cylindrical cylindrical case 11, there is a strip insertion hole 13 that penetrates from one side of the cylindrical case 11 to the other side.
is opened, and the strip 14 is inserted through the strip insertion hole 13. The diameter of the strip insertion hole 13 is approximately equal to the diameter of the strip 14 to be cut.

A cutting blade 10 is disposed inside the cylindrical case 11 on the side opposite to one end of the cylindrical case 11 with respect to the strip insertion hole 13.
It is disposed opposite to one end of the cylindrical body with the strip 14 inserted into the strip insertion hole 13 interposed therebetween. As shown in FIG. 7, the cutting blade 10 is mounted on the front end surface of a cylindrical body having an outer circumferential surface that is in close contact with the inner circumferential surface of the cylindrical case 11, from the front edge 15 toward the center of the front end surface. By forming the concave portion 16, a sharp circular blade 17 is formed on the front edge 15, and the strip 14 inserted into the strip insertion hole 13 can be cut at two locations with this blade 17. It's becoming like that. Further, on the outer peripheral surface of the cylindrical body forming the cutting blade 10, there is a first contact sliding peripheral surface and a second contact sliding peripheral surface.
A recess 18 having a width larger than the diameter of the strip insertion hole 13 is formed between the circumferential side and the first close sliding circumferential side 32 and the second close sliding circumferential side 33.

Behind the cylindrical body constituting the cutting blade 10,
Gas sealing member 21 via disk-shaped spacer 20
Place.

The spacer 20 is made of a meltable synthetic resin such as polyethylene or polypropylene. The gas sealing member 21 is a cylindrical body that is open at one end and sealed at the other end, has an outer peripheral surface that is in close contact with the inner peripheral surface of the cylindrical case 11, and is soft and expandable. It is made of a metal with a large coefficient, such as copper, brass, aluminum, etc. The gas sealing member 21 is placed in the cylindrical case 11 so that the spacer 20 is sandwiched between the other end sealing portion and the rear end surface of the cylindrical body of the cutting blade 10.

A gas generating agent 22 is filled between the other end of the cylindrical case 11 and one end opening of the gas sealing member 21 .

The reason why the outer peripheral surface of the gas sealing member 21 is brought into close contact with the inner surface of the cylindrical case 11 is that the gas generated from the gas generating agent 22 is brought into close contact with the inner surface of the cylindrical case 11 and the outer peripheral surface of the gas sealing member 21. This is to prevent the gas from leaking between the holes, and the reason why the circumferential side of the cylindrical body of the cutting blade 10 can slide on the inner circumferential surface of the cylindrical case 11 is due to the expansion pressure of the gas. This is to allow the 10 to move forward smoothly.

As the gas generating agent 22, explosives can usually be used. The gas generating agent 22 is filled in a bottomed cylindrical case 23 having an opening at one end and sealing the other end. The high-pressure gas ejected toward the gas sealing member 21 is sealed with a partition plate 25 that opens a small hole 24 . and,
By arranging this case 23 in this cylindrical case 11 so that the partition plate 25 that sealed the opening faces the gas sealing member 21, the gas generating agent 22 can be transferred to this cylindrical case 11. Fill inside. Further, inside this cylindrical case 11, behind the loaded case 23, the case 23 is disposed behind this cylindrical case 11 due to the reaction when the gas generated from the gas generating agent 22 is ejected from the small hole 24. The movement prevention member 26 prevents movement toward the end.
is provided.

It is preferable that the case 23 and the partition plate 25 are made of pressure-resistant material.

Gas generation from the gas generating agent 22 is performed by a starter device, and in this embodiment, the starter device is inserted into an ignition ball 27 embedded in the gas generating agent 22 filled in the cylindrical case 11. A heat generating resistance wire 28, a power supply V connected to the heat generating resistance wire 28 via a conductive wire 29, and a switch SW.
It consists of Since the conductive wire 29 extends from the cylindrical case 11 and is connected to the switch SW located outside the cylindrical case 11, it is convenient to perform remote starting operation. However, the switch SW may be provided on the outer surface of the cylindrical case 11, and the conductive wire 29 and the power source V may be housed within the cylindrical case 11. Moreover, a seawater battery may be used instead of the starting device.

Note that since the case 23 and the cylindrical case 11 are not integrally formed, when the case 23 is loaded into the cylindrical case 11, the end of the heat generating resistance wire 28 and the conductive wire 29 are connected to each other. It is preferable that the structure is such that the end portions can be electrically connected.

The cutting device 30 shown in FIG.
When turned on, a current flows from the power source V to the heat generating resistance wire 28, igniting the ignition ball 27, and thereby the gunpowder, which is the gas generating agent 22, starts to burn. At this time, the gunpowder burns so that the gunpowder combustion surface ignited by the ignition ball 27 advances toward the partition plate 25, as shown in FIG. As the combustion progresses, the gas pressure inside the case 23 increases. When the entire amount of gunpowder is burned and the gas pressure inside this case 23 reaches its maximum, as shown in FIG.
This high-pressure gas is ejected from the small holes 24 of the partition plate 25, and the pressure of the ejected high-temperature gas is applied to the sealing member 21.
join. Due to the high temperature gas, the gas sealing member 21
expands, and the outer circumferential surface of the gas sealing member 21 and the inner circumferential surface of the cylindrical case 11 come into close contact with each other, preventing high-pressure gas from leaking from the circumferential side of the gas sealing member 21. Due to the high pressure of the gas sealing member 2
1 slides forward instantaneously toward one end of the cylindrical case 11. At this time, the gas sealing member 21 is
Since the spacer 20 is heated by the high-temperature gas, the spacer 20 melts and improves the sealing between the inner peripheral surface of the cylindrical case 11 and the outer peripheral surface of the gas sealing member 21. When this gas sealing member 21 slides forward instantaneously, the cutting blade 10 is also pushed forward instantaneously by being pushed by this gas sealing member 21, and as shown in FIG. The strip 14 inserted into the strip insertion hole 13 is cut at two locations A and B in one shot. During this cutting, the outer peripheral surface of the gas sealing member 21 expanded by the high-temperature gas, the first sliding peripheral surface 32 and the second peripheral sliding surface 33 come into close contact with the inner peripheral surface of the cylindrical case 11. As a result, the gas generated inside the cylindrical case 11 is sealed, and the molten spacer 20
This further ensures gas sealing.

In this way, the partition plate 25 is attached to the opening of the case 23.
is provided, and the high-temperature, high-pressure gas obtained by burning the entire amount of gunpowder in this case 23 is delivered to this partition plate 25.
It ejects from the small hole 24 like a jet,
The cutting blade 10 moves forward instantaneously at high speed, thereby making it possible to reliably cut the strip 14. Moreover, since the cutting blade 10 is formed with a recess 18 on the circumferential side of its cylindrical body, the torn piece 19 at the cut end of the strip produced when cutting the strip 14 is removed from the cylindrical case 11. The cut strip 14 is prevented from being caught between the inner peripheral surface of the cutting blade 10 and the peripheral surface of the cylindrical body of the cutting blade 10, and the cut strip 14 is
can be completely separated from 1.

Moreover, even if the strip 14 is cut in this way, the gas sealing member 21, the close sliding first circumferential side 3
2. Close sliding second circumferential side 33 and spacer 2
0 sealing prevents the high-temperature, high-pressure gas generated by the gas generating agent 22 from leaking out of the cylindrical case 11, so there is no danger to workers around the cutting device 4, and there is no danger to the surrounding people. It has no adverse effect on machinery and equipment.

After cutting the strip 14, a gas vent hole (not shown) provided on the circumferential side of the cylindrical case 11 is opened to leak the high pressure gas inside the case. It goes without saying that gas leaks should be carried out in a safe place where it will not adversely affect the surrounding area.

Note that 31 in the figure is a blade stop that prevents the cutting blade 10 from moving forward. Needless to say, the position of this blade stop is adjusted so that the recessed portion 18 of the cutting blade 10 stopped by this blade stop faces the strip insertion hole 13.

Although one embodiment of the present invention has been described above,
It goes without saying that the present invention is not limited to the embodiments described above, and that various modifications and changes can be made within the scope of the gist of the invention.

[Effects of the Invention] The cutting blade according to the present invention has a diameter of an opening through which the strip is inserted in the circumferential surface between the first closely sliding circumferential side and the second closely sliding circumferential side of the cylindrical body. Since a recess having a width larger than The cutting blade can be smoothly advanced without being caught between the circumferential side of the cylindrical body and the inner circumferential surface of the cylindrical case, and the cut strip can be completely separated from the cylindrical case. can do. Further, in the present invention, the strip is cut at two places by having a blade formed by recessing the front edge of the cylindrical body toward the center, so that the strip can be cut reliably. can do.

[Brief explanation of drawings]

Figure 1 is a perspective view showing the cutting blade of the present invention, Figure 2 is a perspective view showing the cutting blade of the present invention;
3 is a perspective view showing a conventional cutting blade, FIG. 4 is a longitudinal sectional view showing a state in which a strip is cut with the cutting blade, and FIG. 5 is a partial longitudinal sectional view showing a conventional cutting device. 6 is a longitudinal sectional view showing a state in which a strip is cut with the cutting blade according to the present invention, FIG. 6 is a longitudinal sectional view showing an embodiment of the invention, and FIG. 7 is a perspective view showing the cutting blade in the embodiment. , FIG. 8 is a longitudinal sectional view showing a state in which gas is generated in the embodiment, and FIG. 9 is a longitudinal sectional view showing a state in which a strip is cut in the embodiment. 10... Cutting blade, 11... Cylindrical case, 13...
... Strip insertion hole, 14... Strip, 15... Front edge,
17...blade, 18...recess.

Claims (1)

[Claims] 1. A cutting blade of a cylindrical body disposed in the cylindrical case so as to be able to move forward by sliding on the inner circumferential surface of the cylindrical case provided with a strip insertion hole through which the cylindrical body is inserted. A blade formed on the front edge by recessing the front edge of the shaped body toward the center from the front edge slides in close contact with the inner peripheral surface of the cylindrical case provided on the front edge side. The contact sliding first peripheral surface, the contact sliding second peripheral surface provided on the rear end surface side of the cylindrical body, and the contact sliding first peripheral surface and the contact sliding second peripheral surface having the A cutting blade having a width larger than the diameter of the strip insertion hole and a recess formed so as to circulate around the circumferential surface of the cylindrical body.