Wedge knife for splitting firewood

Abstract

To provide a wedge knife for splitting firewood that has improved durability and safety. [Solution] The firewood splitting wedge knife has improved durability by setting the thickness of the knife's spine between 10mm and 20mm, and the distance from the edge of the blade to the spine between 16mm and 38mm. The blade shape is either Scandi grind or full flat grind, and the blade's large cutting angle is configured at multiple angles, improving safety and efficiency when splitting firewood. Furthermore, the small cutting angle at the edge of the blade is set to 60°, and the blade thickness is 0.1mm or more, making it less likely to cause injury if accidentally touched. The blade length is kept to 5.6cm or less, improving ease of use.

Description

[Technical Field]

[0001] This invention relates to a knife suitable for splitting firewood during camping or leisure activities, and is characterized by a shape design that enhances the strength and safety of the blade. [Background technology]

[0002] Axes and knives are typically used for splitting firewood while camping or for leisure activities, but knife blades are often 3-5mm thick, meaning there is a risk of chipping or breaking when they come into contact with hard rocks on the ground. Another problem is that knife blades are sharp, making them prone to injury if you are not careful. Summary of the Invention [Problem to be solved by the invention]

[0003] While knives are light and easy to carry, they are prone to chipping and have long, exposed sharp edges, which pose safety issues. The purpose of this invention is to solve these problems by providing a wedge knife specifically for splitting firewood, with a thicker spine for improved durability and safety. This makes the blade less likely to be damaged when it comes into contact with hard objects, and improves safety during work. [Means for solving the problem]

[0004] This knife has a back thickness of 10mm or more but less than 20mm, which prevents chipping and breaking of the blade and improves its strength and durability. This makes the blade less likely to be damaged even when it comes into contact with hard objects when splitting firewood at camp, resulting in a knife that can be used for a long time.

[0005] Knives with a spine thickness between 10mm and 20mm have stronger blades, which improves durability and reduces chipping and breakage compared to conventional knives with a thickness of 3-5mm. Furthermore, because less of the sharp edge is exposed, there are fewer sharp edges, improving safety. While the increased thickness of the spine slightly reduces cutting performance, it is still sufficient for splitting firewood and other uses, so it does not impair practicality.

[0006] This device prevents the problem of "getting stuck in the cracks in the firewood" that often occurs when using a blade with a thin spine by setting the distance from the blade edge to the back of the firewood to between 16mm and 38mm. For a 10mm thick firewood, the blade angle can be adjusted to the optimal range by keeping the distance to the blade edge between 16mm and 38mm. When the blade gets stuck in the cracks in the firewood, the contact area between the blade and the firewood increases, creating friction that can make it difficult to pull out. By setting the thickness of the spine to 10mm to 20mm and the distance to the edge of the blade to 16mm to 38mm, the spine of the knife becomes wider than the crack, reducing the contact area and preventing jamming.

[0007] The blade shape should be Scandi grind or full flat grind. Even if the blade is over 10mm thick, a hollow grind can create a sharp blade, increasing the risk of injury, so a Scandi grind or full flat grind is more suitable. Another advantage is that the blade shape is symmetrical, making it easier to maintain.

[0008] The blade's cutting edge angle can be set to two angles: 15°, 30°, or 60°. By having two cutting edges, you can match the angle of the split in the firewood, reduce the contact area with the firewood, and reduce resistance, allowing you to split firewood efficiently depending on its condition.

[0009] The cutting edge of the blade has a 60° angle and the thickness of the sharpest part is 0.1 mm or more. By increasing the cutting angle and increasing the thickness, it is less likely to cause cuts even if the blade is accidentally touched, increasing safety. Even if the blade is not sharp, it can still perform well for splitting firewood.

[0010] The blade length should be 5.6cm or less. A blade that is too long not only increases the overall weight of the knife, but also increases the risk of injury if excessive force is applied, so keeping the blade length to 5.6cm or less keeps it easy to handle.

[0011] The Scandi grind shape of the blade allows for a flat triangular cutting edge, which makes the cutting edge less susceptible to breakage and increases durability, even if the cutting edge comes into contact with hard ground with too much force while splitting firewood. DETAILED DESCRIPTION OF THE INVENTION

[0012] Example 1: Knife with a large cutting angle In this example, we propose a knife with a 30° blade angle. This design allows the knife to provide the necessary penetrating power for splitting firewood while enhancing the safety of the blade edge. Specifically, the thicker blade reduces the sharpness, reducing the risk of cuts even if the knife accidentally touches something during use. This design serves as a safe tool, particularly suitable for beginners and camping enthusiasts.

[0013] Example 2: Knife with two large cutting angles In this example, we propose a knife with a 60° and 30° blade angle. This allows you to split firewood at the optimal angle depending on the crack in the wood. The 30° angle is suitable for fine cutting, while the 60° angle is suitable for cutting tasks that require more force. By having two angles, the knife can flexibly adapt to various situations and achieve efficient firewood splitting. The recommendation to use Scandi grind and full flat grind shapes is merely a recommendation and does not limit the blade shape to these. Therefore, it is also acceptable to use a hollow grind. [Brief explanation of the drawings]

[0014] [Figure 1] This shows the blade shape of Example 1. Example 1: This is a diagram showing the characteristics of the blade shape, spine thickness (a) and the distance from the spine to the edge of the blade (b). This is an example with a large blade angle of 30°, with a = 10 mm and b = 18.7 mm. The cutting edge is a wedge (single-edged) shape with a width of 10 mm.

[0015] [Figure 2] The figure shows the blade shape of Example 2. The knife spine thickness (a) is 10 mm, and the distance from the edge of the blade to the thickest point of the spine is (b) = 18.7 mm when the cutting edge angle is 30°, and (c) = 8.7 mm when the cutting edge angle is 60°. The cutting edge is a 10 mm wide wedge (single-edged) shape. There are two types of cutting edges (30° and 60°).

[0016] [Figure 3] 1 shows the cross-sectional shapes of the full flat grind portion and the scandi grind portion of Example 2. [Prior art documents] [Patent documents]

[0017] [Patent Document 1] Although no existing documents directly related to the present invention have been identified, the following utility model exists as a technology related to the blade shape: Utility Model Registration No. 3180663 for the Shape of the Blade of a Plaster Knife for Dental Laboratory Use [Non-patent literature]

[0018] [Non-Patent Document 1] Research on cutting with knife-like cutting tools, Vol. 62, No. 9, 1996, pp. 1340-1344

Claims

1. As shown in Figure 1, this knife is capable of generating vertical force and spreading force when splitting firewood, and is characterized by the thickness (a) of the back of the knife being 16 mm or more but less than 20 mm.

2. In addition to claim 1, the knife is characterized in that the distance (b) from the edge of the blade to the spine is between 16 mm and 38 mm. This achieves a good balance between the vertical penetration force when splitting firewood and the expansion force when spreading the firewood, resulting in a durable knife that is less likely to break when force is applied.

3. To make blade maintenance easier, the blade shape is double-edged, Scandi grind or full flat grind.

4. The edge of the blade is characterized by having two major cutting angles selected from the group consisting of 15°, 30°, and 60°.

5. The blade edge angle is set to 60° so that it has almost no effect on the vertical penetration force when splitting firewood, and the thickness of the blade edge at its sharpest point is 0.1 mm or more.

6. It is characterized by a blade length of 5.6 cm.

7. In the unlikely event that the firewood cannot be split even at the thickest part of the blade's cutting edge (10 to 20 mm), the sharpest part of the cutting edge is shaped like a wedge (single-edged) unlike ordinary knives. Example 1 is characterized by combining claims 1, 2, 3, 5, 6, and 7 to provide a knife with a spine thickness of 10 mm or more but less than 20 mm, and a distance from the blade to the spine of 16 mm or more but less than 38 mm, thereby achieving greater efficiency and durability. In Example 2, the above combination is further combined with claim 4 to propose a knife with a double-edged shape and two different blade angles, which is characterized by being easy to maintain and improving operability when splitting firewood. This invention relates to a combination of claims 1 to 7, and is characterized by a knife with a spine thickness of 10 mm to less than 20 mm, a 60° bevel angle at the edge of the blade, and a blade length of 5.6 cm or less. This design provides sufficient penetration and expansion power when splitting firewood while reducing the risk of injury when touching the blade. The overall length of the knife is also easy to handle and fits within a size suitable for camping and other uses. The above is just an example of a possible combination, and does not limit the combination.

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