Plane base bottom ruler

Abstract

To provide a bottom edge ruler for adjusting a plane stand which is made of a lightweight and durable material to facilitate checking of precise adjustment and reduce fatigue caused by the adjustment. [Solution] A horizontally long, plate-shaped bottom end ruler that is brought into contact with the contact points 28 and 29 of the base lower end 22 of the plane head 21 of a plane 20 to check the surface condition of the contact points 28 and 29 of the base lower end 22 of the plane head 21, and comprises a ruler body 2 and an edge portion 3 provided at the bottom of the ruler body 2, and is made of extra-super duralumin.

Description

[Technical field]

[0001] This invention relates to a bottom edge ruler that is used to check the surface condition of the bottom edge of a plane head by contacting it with the bottom edge of the plane head. [Background technology]

[0002] A bottom edge ruler is used when adjusting the blade of a plane by placing it against the bottom edge of the base of the plane table and frequently holding it up to the light to check the gap between the bottom edge of the base of the plane table and the bottom edge of the bottom edge ruler; however, bottom edge rulers are either made by the plane user out of wood or are available as pre-made stainless steel products. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Jitszen No. 50-075193 Publication [Non-patent literature]

[0004] [Non-Patent Document 1] Matsui Precision Industry Co., Ltd. Product Catalog Summary of the Invention [Problem to be solved by the invention]

[0005] The above-mentioned Patent Document 1 describes a device that has a compass-like body and is equipped with a bottom ruler, and the two bottom rulers are simultaneously placed against the bottom end of the base of the plane stand of the plane, making it easy to check for twists in the base. However, there is no mention of checking for bulges that occur near the front of the cutting edge. The material is not specified, but it is generally made of stainless steel.

[0006] In the product catalog of Matsui Precision Industry Co., Ltd. in the above Non-Patent Document 1, the material is stainless steel, the plate is 3-6 mm thick, 400-600 mm long, and 34-43 mm high, the shape is a horizontally long rectangle, and the notch is provided at a position of 3:7 with respect to the overall length. Since the width of the notch is 10 mm, it is not impossible to check the bulge that occurs near the front of the cutting edge, but it is necessary to move the lower end ruler back and forth to check.

[0007] With conventional stainless steel bottom rulers, when making adjustments, the bottom ruler must be placed against the bottom edge of the plane stand, and when it is necessary to frequently hold it up to the light to check, its weight places a strain on the user's arms. [Means for solving the problem]

[0008] This invention is a long, horizontal, plate-shaped bottom end ruler that is used to check the surface condition of the bottom end of the base of a plane head by contacting it with the contact point of the bottom end of the base of a plane head.The bottom end ruler has a ruler body and an edge portion provided at the bottom of the ruler body, and is made of extra-super duralumin. Effect of the Invention

[0009] The bottom edge ruler of this invention is made of extra-super duralumin, so it is lighter than the conventional stainless steel bottom edge ruler. This reduces the strain on the arm when checking the surface condition of the bottom edge of the plane stand by contacting the bottom edge ruler with the bottom edge of the plane stand, reducing fatigue and making it easier to check more frequently, which is effective for precise adjustments. [Brief description of the drawings]

[0010] [Figure 1] FIG. 2 is a front view showing one embodiment of the bottom ruler of the present invention. [Diagram 2] FIG. 2 is a cross-sectional view taken along line AA in FIG. [Diagram 3] FIG. 1 is a front view showing an example of a conventional stainless steel bottom ruler. [Figure 4] FIG. 1 is a cross-sectional view showing an example of a conventional stainless steel bottom ruler. [Diagram 5]This is a diagram showing the bottom ruler in use when it is abutted against the plane head. [Figure 6] FIG. 1 is an enlarged view of the proposed cutout in use. [Figure 7] FIG. 13 is an enlarged view of the usage of a notch in a conventional product. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] FIG. 1 is a front view showing one embodiment of the bottom edge ruler 1 of the present invention, and FIG. 2 is a view showing a cross section taken along the line AA in FIG. 1. FIG. 5 is a view showing a state in which the bottom edge of the bottom edge ruler 1 of the present invention is in contact with the contact point 28 of the base bottom end 22 of the plane base 21 of the plane 20. FIG. 6 is a partially enlarged view of FIG. 5. FIG. 7 is a partially enlarged view of a state in which the bottom edge of a conventional bottom edge ruler is in contact with the contact point 28 of the base bottom end 22 of the plane base 21 of the plane 20. In addition, the horizontal direction in FIG. 1, FIG. 3, and FIG. 5 to FIG. 7 may be referred to as the lateral direction in this specification, and the vertical direction in FIG. 1, FIG. 3, and FIG. 5 to FIG. 7 may be referred to as the height direction in this specification. In addition, the horizontal direction in FIG. 2 and the direction perpendicular to the paper surface in FIG. 5 may be referred to as the width direction. In addition, in FIG. 1, FIG. 3, and FIG. 5 to FIG. 7, the left side is the front, and the right side is the rear.

[0012] The bottom ruler 1 and the plane 20 will be described with reference to Figures 1, 2 and 5. The bottom ruler 1 is a bottom ruler that is brought into contact with the contact points 28 and 29 of the base bottom end 22, which is the underside of the plane base 21 of the plane 20, to check the surface condition of the base bottom end 22 (see Figure 5). As shown in Figures 1 and 2, the bottom ruler 1 is plate-like and has a horizontally long rectangular shape. The plane 20 is a typical plane that has been used conventionally, and as shown in Figure 5, the plane 20 has a rectangular plane base 21 and a plane blade 24 with a tip 23 protruding from the base bottom end 22, which is the underside of the plane base 21. The plane base 21 is formed with a hole 25 into which the plane blade 24 is inserted and fixed. The base bottom end 22 has A cutting edge 26 is formed which is an opening communicating with the first hole 25, and the tip 23 of the plane blade 24 protrudes from the base lower end 22 via the cutting edge 26. The amount by which the tip 23 protrudes from the base lower end 22 is adjusted by hitting the rear end of the plane blade 24 opposite the tip 23 with a mallet or the like. Hitting points 28 and 29 provided in two places, at the rear of the cutting edge and at the terminal end of the plane base 21, are provided with a height difference of 0.03 mm from the other parts of the base lower end 22 for the purpose of reducing contact resistance with the wood being cut by the plane 20.

[0013] The amount of protrusion of the tip 23 from the base lower end 22 is adjusted by hitting the rear end of the plane blade 24 opposite the tip 23 with a mallet or the like, so that a bulge 27 (see FIG. 6) that protrudes from the base lower end 22 may be formed higher than the impact point 28 in the front vicinity of the cutting edge 26 of the base lower end 22. If the bulge 27 is formed higher than the impact point 28, when cutting wood with the plane 20, the bulge 27 will come into contact with the cutting surface of the wood, significantly affecting the quality. Therefore, before using the plane 20, it is necessary to check the surface condition of the base lower end 22, i.e., the presence or absence of the bulge 27, and the bottom end ruler 1 of this embodiment is used to check the surface condition of the base lower end 22.

[0014] The horizontal length of the bottom ruler 1 is approximately 270mm to 480mm, and the horizontal length of the plane base 21 is approximately 270mm to 480mm. When checking the surface condition of the bottom end 22 of the plane base 21, the bottom ruler 1 may be abutted against the diagonal of the bottom end 22, so the length is set to 300mm to 600mm, taking into account the width of the plane base 21. In addition, the thickness (plate thickness) t was 3mm to 4mm for conventional stainless steel in consideration of ease of holding (see Figure 4), but by using duralumin, it is possible to reduce the weight compared to conventional stainless steel bottom rulers, so the thickness t can be increased and set to 5mm to 7mm. The height was 35mm for conventional products, but the bottom ruler 1 is set to 40mm. The hanging hole 5 is provided so that the bottom ruler can be hung on a wall or the like when not in use. By setting the plate thickness t of the bottom ruler 1 to 5 mm to 7 mm, the plate thickness t can be made thicker than that of a conventional stainless steel bottom ruler, making it easier to hold.

[0015] The bottom edge ruler 1 comprises a ruler body 2 and an edge portion 3 provided at the bottom of the ruler body 2. As shown in FIG. 2, both sides of the edge portion 3 are inclined so as to approach each other downward. In other words, the edge portion 3 is inclined so that the thickness thereof becomes thinner as it goes downward, and has a so-called double-edged shape. By making the edge portion 3 have a double-edged shape, the thickness of the portion of the edge portion 3 that abuts against the impact points 28 and 29 of the base lower end 22 of the plane stand 21 of the plane 20 becomes thin, so that when the edge portion 3 abuts against the base lower end 22 of the plane stand 21 of the plane 20 to check the surface condition of the base lower end 22 of the plane stand 21 can be checked more accurately because light can easily pass through. In this embodiment, the edge portion 3 has a double-edged shape, but the shape is not necessarily limited to this as long as the thickness of the portion of the edge portion 3 that abuts against the abutment point 28 and the abutment point 29 of the base lower end 22 of the plane base 21 of the plane 20 is thin. For example, the edge portion 3 may have a so-called single-edged shape in which the thickness of the edge portion 3 is inclined so as to become thinner as it goes downward on only one side.

[0016] The bottom ruler 1 also has a notch 4 formed at the lower end of the edge portion 3. The notch 4 is formed at the lower end of the edge portion 3 to prevent the tip 23 of the plane blade 24 from being deformed or chipped when the tip 23 hits the bottom ruler 1 when the lower end of the edge portion 3 of the bottom ruler 1 is brought into contact with the hitting points 28 and 29 of the base lower end 22. The opening width W of the notch 4 is 4 mm to 6 mm, matching the width of the cutting edge 26.

[0017] Next, the conventional bottom ruler will be described with reference to Figure 3. The conventional bottom ruler is different from the bottom ruler 1 of this embodiment in terms of material, opening width W of notch 4, and plate thickness, but other configurations are the same, so explanations of each component of the conventional bottom ruler will be omitted and the numbering of each component will be the same as that of the bottom ruler 1 of this embodiment. As shown in Figure 3, the opening width W of the notch 4 of the conventional bottom ruler 1 is 10 mm.

[0018] Next, the use of the bottom edge ruler 1 of this embodiment will be described with reference to Figures 5 and 6. The bottom edge ruler 1 is a bottom edge ruler that is brought into contact with the impact points 28 and 29 of the base bottom end 22 of the plane 20 to check the surface condition of the base bottom end 22. Therefore, the notch 4 of the bottom edge ruler 1 is aligned with the cutting edge 26 of the plane 20, and the lower end of the edge portion 3 of the bottom edge ruler 1 is brought into contact with the impact points 28 and 29 of the base bottom end 22 of the plane 20. If the bulge 27 is not formed at the base bottom end 22 of the plane 20, light leaks from the gap 30 in front of the cutting edge 26 and near the boundary between the edge portion 3 and the notch 4, so that it can be confirmed that the bulge 27 is not formed at the base bottom end 22 of the plane 20.

[0019] When a bulge 27 is formed at the base lower end 22 of the plane 20, the gap 30 in front of the cutting edge 26 comes into contact with the bulge 27 near the boundary between the edge portion 3 and the notch 4, preventing light from leaking, so it is possible to confirm that the bulge 27 is formed at the base lower end 22 of the plane 20. The opening width W of the notch 4 of the bottom end ruler 1 of this embodiment is 4 mm to 6 mm, which is smaller than the opening width W of the notch 4 of the conventional bottom end ruler 1. Therefore, the bulge 27 formed near the front of the cutting edge 26 of the base lower end 22 can be reliably confirmed by using the bottom end ruler 1.

[0020] Next, the use of a conventional bottom ruler 1 will be described with reference to Figure 7. The opening width W of the notch 4 of the conventional bottom ruler 1 is 10 mm. Therefore, even if a bulge 27 is formed near the front of the cutting edge 26 of the base bottom end 22 as shown in Figure 7, the opening width W of the notch 4 is 10 mm, so the bulge 27 is located at the opening of the notch 4. Therefore, it is not possible to confirm that the bulge 27 is formed at the base bottom end 22 of the plane 20.

[0021] In order to make the feeling of holding the bottom ruler 1 lighter, as shown in Table 1, extra super duralumin (A7075) is used, which is a lightweight aluminum alloy with a specific gravity of 2.8 compared to 7.9 for stainless steel and has a strength similar to that of stainless steel. [Table 1]

[0022] Since one embodiment of the present invention is constructed as described above, it is necessary to store the ruler separately from other tools when not in use. In particular, damaging the edge of the ruler by contacting it with other tools will affect its performance as a ruler. There are 5 hanging holes on the main body 1 so that the ruler can be hung on the wall when not in use. [Explanation of symbols]

[0023] 1 Bottom ruler 2 Ruler body 3 Edge section 4 Notch 5 Hanging hole 20 Plane 21 Plane stand 22 bottom end 23 Tip 24 Planer blade 25 Instep hole 26 Blade mouth 27 Bulge 28 Hit 29 Hit 30 Gap

Claims

1. This bottom end ruler is a long, horizontal plate-shaped ruler that is used to check the surface condition of the bottom end of the base of a plane stand by contacting the bottom end of the base of the plane stand, and is characterized in that it has a ruler body and an edge portion provided at the bottom of the ruler body, and is made of extra super duralumin.

2. The bottom ruler according to claim 1, characterized in that the plate width t of the ruler body is in the range of 5 mm≦t≦7 mm.

3. 3. The bottom ruler according to claim 1, wherein a notch is provided in the edge portion, and an opening width W of the notch is in the range of 4 mm≦W≦6 mm.

4. 4. The bottom ruler according to claim 3, wherein the notch is provided at a position of 4:6 relative to the entire length of the bottom ruler.

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