kitchen scissors

Abstract

To provide kitchen scissors that fit the hand well, are easy to use, and allow easy application of cutting force, and further, do not cause fatigue even when used for a long time or when cutting hard food materials. [Solution] The width dimension W1 of the kitchen scissors 1 is 20 mm or more and 30 mm or less, and the thickness dimension at its largest point is 13 mm or more and 25 mm or less. The thickness dimension at its smallest point is 7 mm or more and 13 mm or less. Furthermore, the length dimension L1 of the first and second finger holes 12, 22 in the longitudinal direction is 50 mm or more and 80 mm or less. The thickness of the connecting points between the inner section 131, 231 and the outer section 132, 232 of the first and second scissors parts 10, 20, on the first finger hole 12 or second finger hole 22 side, gradually decreases toward the first finger hole 12 or second finger hole 22 side, forming a seamless slope from the inner section 131, 231 toward the connecting points.

Description

[Technical Field]

[0001] The present disclosure relates to kitchen scissors used for cutting food ingredients. [Background technology]

[0002] Patent Document 1 discloses a conventional pair of scissors. The finger holes formed in each handle of these scissors are openings large enough to accommodate multiple fingers. The openings that make up the finger holes are elongated holes that run along the length of the scissors, and have rounded contours that accommodate multiple lined-up fingers. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 7442230 Summary of the Invention [Problem to be solved by the invention]

[0004] Scissors are used as kitchen scissors for cutting food ingredients. Because kitchen scissors are used to cut thick or hard ingredients, they must fit comfortably in the hand, be easy to use, and be easy to apply force to. Furthermore, they must also be comfortable to use for extended periods of time or when cutting hard ingredients. In particular, in recent years, kitchen scissors have become popular for cutting various ingredients without using knives, and these demands have become even stronger. However, the openings that form the finger holes in these scissors are simply rounded, which does not fit the hand well and makes them difficult to use as kitchen scissors. Furthermore, weight is applied to certain parts of the hand, which can cause fatigue when used for extended periods of time or when cutting hard ingredients.

[0005] To provide kitchen scissors that fit the hand well, are easy to use, allow easy application of cutting force, and do not cause fatigue even when used for long periods of time or when cutting hard ingredients. [Means for solving the problem]

[0006] A first aspect of the present disclosure is a pair of kitchen scissors that are opened and closed by being rotated about a rotation center (C1) with one direction being the longitudinal direction, The scissors are provided with a first scissors part (10) and a second scissors part (20) each having a blade (11, 21) on one side in the longitudinal direction with respect to the rotation center and a grip (13, 23) having a finger hole (12, 22) on the other side, The grips of the first scissors section and the second scissors section each have an inner section (131, 231) that extends in the longitudinal direction and is a portion to be gripped, and an outer section (132, 232) that is connected to the inner section and is located on the outer side of the fingers, The direction in which the blades of the first scissors portion and the second scissors portion overlap is the thickness direction, and the direction perpendicular to the longitudinal direction and the thickness direction is the width direction, Among the connecting portions (133a, 133b, 233a, 233b) between the inner portion and the outer portion of the first scissors part and the second scissors part, the portion of the connecting portion (133b, 233b) on the rear end side far from the blades, on the finger hole side, has a dimension in the thickness direction gradually reduced toward the finger hole side, is seamlessly connected from the inner portion to the connecting portion on the rear end side, and is inclined with respect to a plane parallel to the longitudinal direction and the width direction, The portion of the inner part where the finger hole is located has a tapered shape in which the dimension (T1) in the thickness direction decreases as it moves away from the rotation center, and the dimension (T1L) at the position (TL) where the dimension in the thickness direction is the largest is 13 mm or more and 25 mm or less, and the dimension (T1S) at the position (TS) where the dimension is the smallest is 7 mm or more and 13 mm or less, and the dimension (W1) in the width direction from the finger hole side of the inner part of the first scissors part to the finger hole side of the inner part of the second scissors part is 20 mm or more and 30 mm or less, In the longitudinal direction, the dimensions (L1) of the finger holes in the first scissors part and the second scissors part from the side closest to the rotation center to the side farthest from the rotation center are both 50 mm or more and 80 mm or less. R, At the connecting portion on the rear end side, the outline of the finger hole is rounded in an R shape, and the radius of curvature of the R shape is 4 mm or more and 10 mm or less, The dimension (T2) in the thickness direction of the outer portion is smaller than the dimension (T1S) of the inner portion at the position where the dimension in the thickness direction is smallest, and is set to be 5 mm or more and 10 mm or less throughout the outer portion. , At least one of the grips of the first scissors section and the second scissors section is provided with a hit point (134, 234) at a position between the respective inner sections, If the finger hole is divided into four regions in the longitudinal direction, the regions will be referred to as a first region (R1), a second region (R2), a third region (R3), and a fourth region (R4) in order from the rotation center side, The position where the widthwise dimension (W1) is the largest at the position where the finger hole is formed and the hit point are both located within the ranges of the second region and the third region, Furthermore, the outer portions of the grips of the first scissors part and the second scissors part have an inner edge side facing the finger hole that is rounded to have an elliptical cross section, and a wall surface on the opposite side of the finger hole that has a circular cross section with a larger radius of curvature than the inner edge side, thus forming a semi-elliptical cross section, The rear end side portion (132b, 232b) of the outer portion, which is the portion on the rear end side, has a dimension (W2) larger in the direction extending in the normal direction to the tangent direction of the outline of the finger hole than the opposing portion (132a, 232a) of the outer portion, which is the portion opposing the inner portion. .

[0007] This configuration makes it possible to create kitchen scissors that fit the hand well, are easy to use, and allow for easy application of force, and that do not cause fatigue even when used for long periods of time or when cutting hard ingredients.

[0008] The reference symbols in parentheses attached to each component indicate an example of the correspondence between the component and the specific components described in the embodiments described below. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a front view of kitchen scissors according to a first embodiment of the present disclosure. [Figure 2] FIG. 2 is a top view of the kitchen scissors of FIG. 1. [Figure 3] FIG. 2 is a view of the kitchen scissors of FIG. 1 as seen from the right side. [Figure 4] FIG. 2 is a binarized front view of the kitchen scissors shown in FIG. [Figure 5] FIG. 2 is a binarized perspective view of the kitchen scissors shown in FIG. [Figure 6] 2(a) to 2(c) are cross-sectional views taken along the lines VIA-VIA, VIB-VIB, and VIC-VIC in FIG. 1, respectively. [Figure 7] 3 is a diagram showing a state in which kitchen scissors are held, as viewed from the direction shown in FIG. 2. FIG. [Figure 8] 2 is a diagram showing a state in which kitchen scissors are held, as seen from the direction shown in FIG. 1. FIG. [Figure 9] FIG. 10 is a diagram showing the results of a user test. [Figure 10] FIG. 10 is a diagram showing the results of a user test. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. In the following, including other embodiments described below, identical or equivalent parts will be denoted by the same reference numerals.

[0011] (First embodiment) Kitchen scissors 1 according to a first embodiment of the present disclosure will be described below with reference to Figures 1 to 8. Figures 1 to 3 show a front view of kitchen scissors 1 and a view of Figure 1 as seen from above or from the right side, but to better understand the shape of kitchen scissors 1, Figures 4 and 5 show a front view and a perspective view in which the image of kitchen scissors 1 has been binarized to show shading.

[0012] [Kitchen scissors 1 configuration] The kitchen scissors 1 shown in Figs. 1 to 8 are used to cut food ingredients, and can be used to cut not only thin or soft food ingredients, but also large or hard food ingredients.

[0013] The drawings accompanying this specification indicate the X-axis, Y-axis, and Z-axis. As shown in Fig. 1, the left-right direction on the paper when kitchen scissors 1 are viewed from the front, i.e., the longitudinal direction, is called the X-axis, the up-down direction on the paper perpendicular to the X-axis, i.e., the width direction of kitchen scissors 1, is called the Y-axis, and the thickness direction of kitchen scissors 1, which is perpendicular to the X-axis and Y-axis, is called the Z-axis. Furthermore, the left side of kitchen scissors 1 on the paper in Fig. 1, i.e., the cutting edge side, is called the leading end, and the right side on the paper in Fig. 1 is called the trailing end.

[0014] As shown in Figures 1 to 5, kitchen scissors 1 have a structure in which first scissors section 10 and second scissors section 20 are connected via shaft section 30, and ingredients are cut by opening and closing first scissors section 10 and second scissors section 20 with the center of shaft section 30 as a pivot center C1. Note that when first scissors section 10 and second scissors section 20 are closed, the direction extending from shaft section 30 to each blade 11, 21 of each scissors section 10, 20 corresponds to the longitudinal direction of kitchen scissors 1. Hereinafter, when simply referred to as "longitudinal direction," this refers to the longitudinal direction of kitchen scissors 1.

[0015] When cutting ingredients, kitchen scissors 1 are used with their longitudinal direction horizontal or tilted relative to the horizontal, with their thickness direction oriented approximately horizontal. When kitchen scissors 1 are held in the manner shown in FIGS. 7 and 8, specifically with the right hand positioned on the far side of the paper in FIG. 1, first scissors section 10 is the side operated by first finger (thumb) F1, and second scissors section 20 is the side operated by the second through fifth fingers (index finger, middle finger, ring finger, and little finger) F2 through F5 other than first finger F1. The following description will be given taking as an example a case where kitchen scissors 1 are used in the manner shown in FIGS. 7 and 8. If the center line of kitchen scissors 1 is a straight line extending in the longitudinal direction through center of rotation C1, kitchen scissors 1 are configured to be roughly rotationally symmetrical with respect to that center line. Therefore, the kitchen scissors 1 can be used by flipping the top and bottom of the paper in Figure 1 so that the second scissors part 20 is the side operated by the first finger and the first scissors part 10 is the side operated by something other than the first finger.

[0016] The first scissors unit 10 has a first blade 11 on one side in the longitudinal direction of the shaft 30, which serves as the center of rotation C1, and a first grip 13 having a first finger hole 12 on the other side, with these connected via a scissors body 14 and a butt 15. The second scissors unit 20 has the same structure as the first scissors unit 10, and has a second grip 23 having a second blade 21 and a second finger hole 22, with these connected via a scissors body 24 and a butt 25.

[0017] The first blade 11 and the second blade 21 are made of metal such as stainless steel, and are shaped to extend in the longitudinal direction, with the inside of the kitchen scissors 1 being the cutting edge when the scissors are opened. The first and second blades 11, 21 are generally the same thickness except for the cutting edge, and the thickness of the cutting edge gradually decreases in the circumferential direction of the center of rotation C1. The blade length of the first and second blades 11, 21 is arbitrary, but is set to, for example, 50 mm or more and 100 mm or less to make it easier to apply cutting force.

[0018] First finger hole 12 is an opening formed in first grip 13, through which first finger F1 is inserted. Second finger hole 22 is an opening formed in second grip 23, through which three or more of the second through fifth fingers F2-F4 other than first finger F1 are inserted. Specifically, all four of the second through fifth fingers, or three of the third through fifth fingers as shown in FIG. 8, are inserted into second finger hole 22. For this reason, the dimensions of first finger hole 12 and second finger hole 22 are set to allow insertion of at least three fingers, and as shown in FIG. 1, the length L1 from the most forward end to the most rear end in the longitudinal direction is set to be 50 mm or more and 80 mm or less.

[0019] First grip 13 and second grip 23 are the portions of kitchen scissors 1 that are held by the user, and are formed with first finger hole 12 and second finger hole 22, respectively.

[0020] The first grip 13 has an inner portion 131 and an outer portion 132. In this embodiment, the first grip 13 is made of a material different from that of the portion constituting the first blade 11, such as a thermoplastic resin (e.g., polypropylene or ABS resin) or rubber. Although not shown, the first grip 13 is formed by insert molding so as to cover a core extending from the rib 15 toward the opposite side of the first blade 11. The portion of the first grip 13 that houses the core and its extended portion constitute the inner portion 131. The inner portion 131 is the portion of the first grip 13 that is held by the user. The outer portion 132 is connected to the inner portion 131 and is located on the outside of the first finger inserted into the first finger hole 12. Specifically, the outer portion 132 is connected to the most distal end and the most proximal end of the inner portion 131 that extends in the longitudinal direction. The boundary positions between the inner portion 131 and the outer portion 132 are indicated by dashed lines in FIG. 1, and hereinafter the boundary that is the most forward connecting point will be referred to as the front end boundary 133a, and the boundary that is the most rear end connecting point will be referred to as the rear end boundary 133b.

[0021] The second grip 23 has an inner portion 231 and an outer portion 232, and has the same configuration as the first grip 13. Of the boundaries between the inner portion 231 and the outer portion 232 in the second grip 23, the boundary that is the connecting point closest to the tip is called the front end boundary 233a, and the boundary that is the connecting point closest to the rear end is called the rear end boundary 233b.

[0022] The inner portions 131, 231 are thicker at their longitudinal midpoints than at other longitudinal locations. As shown in FIG. 2 , the thickness dimension of the inner portions 131, 231 as viewed in the Y-axis direction is referred to as the thickness dimension T1. The thickness dimension T1 gradually changes in the areas where the first finger hole 12 and the second finger hole 22 are located. The inner portions 131, 231 have a tapered shape in which the thickness dimension T1 is largest at or near the tip end of the first finger hole 12 and the second finger hole 22, and smallest at the rear end, with the thickness dimension T1 gradually decreasing from the position TL to the position TS. Specifically, the thickness dimension T1 at the position TL is 13 mm or more and 25 mm or less, and the thickness dimension T1S at the position TS is 7 mm or more and 13 mm or less. The difference between the dimension T1L at position TL and the dimension T1S at position TS is 2 mm or more and 10 mm or less, preferably 5 mm or more and 7 mm or less. Furthermore, the thickness dimension T1 of the inner portions 131, 231 distally of position TL also gradually decreases toward the distal end. Note that if the thickness dimension T1 of the inner portions 131, 231 is greatest near the first finger hole 12 or the second finger hole 22, rather than at the distal end, the thickness dimension T1 of the portion distally of the inner portions 131, 231 may decrease toward the distal end. It is sufficient that position TL is at or near the distal end, and the thickness dimension T1 gradually decreases from there toward position TS.

[0023] The center of gravity of the kitchen scissors 1 in the longitudinal direction may be arbitrarily designed, but here it is located closer to the rear end than the position TL.

[0024] Furthermore, in the portions of the inner portions 131, 231 where the first finger hole 12 and the second finger hole 22 are located, the longitudinal center position bulges more toward the first finger hole 12 and the second finger hole 22 than the other longitudinal portions. As shown in FIG. 1 , the distance from the portion of each inner portion 131, 231 closest to the first finger hole 12 to the portion closest to the second finger hole 22 is referred to as the width dimension W1. The width dimension W1 of the inner portions 131, 231 gradually changes along the longitudinal direction, becoming largest in the middle portion in the longitudinal direction, forming a bulging shape that bulges most toward the first finger hole 12 and the second finger hole 22. The position WL where the width dimension W1 is greatest in the middle portion in the longitudinal direction, closest to the first finger hole 12 and the second finger hole 22, is the position where the width dimension W1 is largest, and the positions on the front and rear ends of the inner portions 131, 231 are smaller than the position WL. On the rear end side of the position WL of both inner portions 131, 231, the widthwise dimension W1 is smallest at the rearmost position WS.

[0025] As shown in FIG. 1, if the inner portion 131 where the first finger hole 12 is formed is divided into four equal parts, designated in order from the front end to the rear end as a first region (R1), a second region (R2), a third region (R3), and a fourth region (R4), the position of the second region (R2) or the third region (R3) is designated as the largest position WL. The width dimension W1 is set to 20 mm or more and 30 mm or less throughout the entire longitudinal direction. Furthermore, the difference between the width dimension W1L at position WL and the width dimension W1S at position WS is set to 1 mm or more and 4 mm or less, preferably 2 mm or more and 3 mm or less.

[0026] Furthermore, as shown in FIGS. 3 and 6(a), the thickness of the inner portions 131, 231 on the outer side 132, 232 side, i.e., the portion closest to the first finger hole 12 or the second finger hole 22, gradually decreases toward the first finger hole 12 or the second finger hole 22 to make it easier to grip. Additionally, the inner portions 131, 231 closest to the first finger hole 12 or the second finger hole 22 are rounded. Therefore, the inner portions 131, 231 on the outer side 132, 232 side have an elliptical cross section. The side of the inner portions 131, 231 opposite the outer sides 132, 232, i.e., the sides where the inner portions 131, 231 face each other, can have any shape, but here it has a circular cross section with a larger radius of curvature than the first finger hole 12 or the second finger hole 22 side. Therefore, the overall cross-sectional shape of the inner portions 131, 231 is roughly an isosceles triangle with an obtuse apex angle and rounded corners.

[0027] As shown in FIG. 1, the outer portions 132, 232 have a generally elliptical arc shape surrounding the first finger hole 12 and the second finger hole 22. As shown in FIG. 2, the thickness of the outer portions 132, 232 is referred to as the thickness dimension T2. ​​The thickness dimension T2 is generally constant throughout the first finger hole 12 and the second finger hole 22, and is between 5 mm and 10 mm. The thickness dimension T2 is matched to the dimension at position TS on the inner portions 131, 231, so that the outer portions 132, 232 and the inner portions 131, 231 are seamlessly connected at the rear boundary 133b, 233b. Furthermore, the thickness dimension T2 is gradually increased on the front boundary 133a, 233a side compared to the rear end side, so that the outer portions 132, 232 and the inner portions 131, 231 are seamlessly connected.

[0028] As shown in Figures 3 and 6(b), the outer portions 132, 232 have a central thickness that bulges toward the first and second finger holes 12 and 22 over the entire area where the first and second finger holes 12 and 22 are located. That is, the thickness of the outer portions 132, 232 gradually decreases toward the first and second finger holes 12 and 22, respectively. Furthermore, the outer portions 132, 232 are rounded toward the first and second finger holes 12 and 22, resulting in an elliptical cross section. The shape of the outer edge of the outer portions 132, 232, i.e., the wall surface opposite the inner edge that corresponds to the first and second finger holes 12 and 22, is arbitrary, but in this example, the outer edge has a circular cross section with a larger radius of curvature than the inner edge. Therefore, the overall cross section of the outer portions 132, 232 is roughly semi-elliptical.

[0029] 1, the contours of the first finger hole 12 and the second finger hole 22 are rounded at the connection points between the inner portion 131, 231 and the outer portion 132, 232 on both the front and rear ends. Here, the radius of curvature of the R shape is set to 4 mm or more and 10 mm or less.

[0030] As shown in FIG. 1, the dimension of each outer portion 132, 232 in the direction normal to the tangent direction of the outline of the first finger hole 12 or the second finger hole 22 is defined as width W2. This width W2 differs between the portion 132a, 232a of the outer portion 132, 232 facing the inner portion 131, 231 (hereinafter referred to as the facing portion) and the rear end portion 132b, 232b (hereinafter referred to as the rear end side portion), with the latter having a larger width than the former. Therefore, as shown in FIGS. 6(b) and 6(c), the rear end side portions 132b, 232b of the outer portion 132, 232 bulge more toward the first finger hole 12 or the second finger hole 22 than the facing portions 132a, 232a. This results in a gentle angle θ between the XY plane and the wall surface of the outer portion 132, 232. For example, the angle θ at the facing portions 132a, 232a is 30 to 60°, and the angle θ at the rear end portions 132b, 232b is 15 to 40°. Specifically, the width W2 at the rear end boundaries 133b, 233b, which are the connecting points on the rear end sides of the inner portions 131, 231 and the outer portions 132, 232, is 9 mm or more and 17 mm or less, and a wide area is provided where the angle θ relative to the XY plane is gentle.

[0031] Furthermore, the first grip 13 and the second grip 23 have hit points 134, 234 formed between the inner portions 131, 231. The hit points 134, 234 ensure a sufficient distance between the inner portions 131, 231 and are capable of withstanding the load when the kitchen scissors 1 are closed. The hit points 134, 234 are formed in the longitudinal center of the portion where the first finger hole 12 and the second finger hole 22 are formed, and are located between the second region (R2) and the third region (R3) shown in FIG. 1. The hit points 134, 234 and the position WL where the widthwise dimension W1 is greatest are both located within the second region (R2) and the third region (R3). These hit points may be located in the same region, or one may be located separately, or both or either may be located across both the second and third regions (R2) and (R3). Preferably, the hit points 134, 234 are located at the same position as the position WL in the longitudinal direction. Here, the hit points 134, 234 are provided on both inner portions 131, 231, but it is sufficient that they are provided on at least one of them.

[0032] Scissor body 14 is thick plate-shaped and connected to first blade 11. Scissor body 14 has a through-hole (not shown) formed from its flat surface toward second scissors section 20. Scissor body 24 is also thick plate-shaped and connected to second blade 21. Scissor body 24 has a through-hole (not shown) formed from its flat surface on the far side of the paper in FIG. 1 toward first scissors section 10. A shaft 30 formed of a bolt, nut, or the like is fitted into the through-holes formed in both scissors bodies 14, 24, forming a rotation center C1 that rotatably connects first scissors section 10 and second scissors section 20.

[0033] The tines 15, 25 are portions that connect the scissors bodies 14, 24 to the respective grips 13, 23. A core (not shown) extends from the scissors bodies 14, 24 opposite the tines 15, 25, and the core is covered by the respective grips 13, 23.

[0034] [Effects of Kitchen Scissors 1] In the kitchen scissors 1 configured as described above, various effects can be achieved by specifying the numerical values ​​of each part based on the following considerations.

[0035] The width dimension W1 and the thickness dimension T1 at positions TL and TS, that is, the dimensions T1L and T1S, are preferably sized to make it easy to wrap around the inner portions 131 and 231 and apply force when bending the fingers to grasp the inner portions 131 and 231.

[0036] When gripping the inner part 131, 231 of the handle, the third to fifth fingers F3 to F5 grip it as it moves away from the center of rotation C1. However, since the third to fifth fingers F3 to F5 are shorter in length in this order, a tapered shape in which the thickness dimension T1 decreases as it moves away from the center of rotation C1 allows the third to fifth fingers F3 to F5 to grip it more firmly.

[0037] Regarding length L1, when using kitchen scissors 1, it is preferable to insert the third to fifth fingers F3 to F5 from the first joint to the second joint to operate, and for people with small hands, it is easier to apply force stably by inserting the second to fifth fingers F2 to F5 from the first joint to the second joint to operate. If length L1 is too small, the third to fifth fingers F3 to F5 cannot be inserted and operation becomes difficult, but if it is too large, the fingers may move within first finger hole 12 or second finger hole 22, causing instability.

[0038] Taking these points into consideration, we conducted various user tests. Specifically, we set appropriate values ​​in advance for the size of the handle and the length L1 of the first finger hole 12 and the second finger hole 22, and then manufactured over 50 prototypes with that length L1 and conducted user tests.

[0039] Here, data indicates that the average hand width for Japanese women is approximately 74 mm and for Japanese men is approximately 83 mm. Therefore, an appropriate value for the length dimension L1 was determined based on this data. Specifically, the upper limit of the length dimension L1 was set assuming that men will insert four fingers into the first finger hole 12 and the second finger hole 22. However, because the MP joints of the hand are not inserted into the first finger hole 12 and the second finger hole 22 when using kitchen scissors 1, it has been confirmed that a length dimension L1 slightly smaller than this value allows the hand to fit snugly against the inner walls of the first finger hole 12 and the second finger hole 22. For this reason, the upper limit of the length dimension L1 is set to 80 mm. The lower limit of the length dimension L1 was set assuming that women will insert three fingers into the first finger hole 12 and the second finger hole 22. The width of a woman's three fingers is approximately 55 mm (≒ 74 mm × 3 / 4), and since making the length dimension L1 slightly smaller than this value allows the glove to fit the hand against the inner walls of the first finger hole 12 and the second finger hole 22, the lower limit of the length dimension L1 is set to 50 mm.

[0040] In this way, more than 50 prototypes were manufactured with the length dimension L1 set to between 50 mm and 80 mm, and a user test was conducted with approximately 10 people of different hand sizes. Figures 9 and 10 show the results of a user test to determine whether the prototype kitchen scissors 1 were easy to grip. In each figure, the O mark indicates when everyone felt it was easy to grip, and the Δ mark and X mark indicate when more people felt it was easy to grip than when it was difficult to grip, respectively.

[0041] First, the length dimension L1 was set in the range of 50 mm to 80 mm, and the width dimension W1 was changed from 15 mm to 35 mm, and the ease of gripping the kitchen scissors 1 when closed and when opening and closing them was evaluated. Figure 9 shows the evaluation results. As shown in this figure, when the length dimension L1 was 50 mm to 80 mm, and the width dimension W1 was 20 mm to 30 mm, the scissors were evaluated as being easy to grip.

[0042] Next, the length dimension L1 was set to 65 mm, which is the median value in the range of 50 mm to 80 mm, and the width dimension W1 was also set to 25 mm, which is the median value in the range of 20 mm to 30 mm, and the thickness dimensions T1L and T1S at positions TL and TS were varied, and an evaluation similar to that shown in Figure 9 was performed. Figure 10 shows the evaluation results. As shown in this figure, the grip was easy to grip when dimension T1L was 12 mm to 25 mm and dimension T1S was approximately 6 mm to 14 mm.

[0043] Here, sensitivity tests were conducted using the median values ​​of the appropriate range for the length dimension L1 and width dimension W1. However, sensitivity tests were also conducted with the minimum values ​​of the appropriate range, i.e., length dimension L1 = 50 mm and width dimension W1 = 20 mm, and with the maximum values ​​of the appropriate range, i.e., length dimension L1 = 80 mm and width dimension W1 = 30 mm, by varying dimensions T1L and T1S. The results were generally similar to the evaluation results in Figure 10 in all cases, but several people found it difficult to grip when dimensions T1S were 6 mm and 14 mm. For this reason, we also investigated when dimension T1S was set to 7 mm, slightly larger than 6 mm, and to 13 mm, slightly smaller than 14 mm, and all test participants rated it as easy to grip.

[0044] The evaluation results for the length dimension L1 and width dimension W1 when they are set to the minimum and maximum values ​​within the appropriate range are believed to be applicable to all values ​​within the appropriate range. This can be seen from the fact that in the median user test shown in Figure 10, all of the values ​​rated as easy to grip at the minimum and maximum values ​​were also found to be easy to grip. Therefore, if the length dimension L1 is set to be 50 mm or more and 80 mm or less and the width dimension W1 is set to be 20 mm or more and 30 mm or less, the kitchen scissors 1 can be made easy to grip by setting the dimension T1L to be 12 mm or more and 25 mm or less and the dimension T1S to be 7 mm or more and 13 mm or less.

[0045] Therefore, the width dimension W1 and the dimensions T1L and T1S are set based on the results of this sensitivity test. As a result, kitchen scissors 1 can simultaneously achieve the effects shown in (1) below.

[0046] (1) The kitchen scissors 1 have a width dimension W1 of 20 mm or more, and a thickness dimension T1L at its widest point TL of 13 mm or more. This allows the scissors to fit the human hand perfectly, allowing for a light grip and a comfortable grip. Additionally, the scissors have a sufficient width for the area to be gripped when cutting ingredients, making it easier to apply force. Furthermore, by setting the width dimension W1 to 30 mm or less and the dimension T1L to 25 mm or less, the area to be gripped is prevented from becoming too thick.

[0047] Furthermore, the difference between the dimensions W1L and W1S is set to 1 mm or more and 4 mm or less, preferably 2 mm or more and 3 mm or less. This prevents the difference between the dimensions W1L and W1S from being too large, allowing the widthwise dimension W1 to gradually decrease from position WL to position WS. Therefore, the inner portions 131, 232 have a width that is easy to grip with the hand, and the gradually decreasing widthwise dimension W1 allows the device to fit comfortably in the palm of the hand when gripped.

[0048] Furthermore, by setting the dimension T1L at the largest position TL to 13 mm or more and 25 mm or less, the kitchen scissors 1 are tall even when placed on a table, making them easy to lift. Furthermore, the dimension T1 in the thickness direction decreases with increasing distance from the pivot center C1, forming a tapered shape, while the dimension T1S at the smallest position TS is set to 7 mm or more and 13 mm or less, preventing the scissors from becoming too thin when gripped. This allows the inner portions 131, 231 to fit comfortably in the palm of the hand when gripped. Furthermore, the difference between the dimension T1L and the dimension T1S is set to 2 mm or more and 10 mm or less, preferably 5 mm or more and 7 mm or less. This prevents the difference between the dimension T1L and the dimension T1S from being too large, allowing the thickness direction dimension T1 to gradually decrease from the position TL to the position TS. Therefore, the inner portions 131, 232 are thick enough to be easily gripped, while the gradually decreasing dimension T1 in the thickness direction allows the scissors to fit comfortably in the palm of the hand when gripped.

[0049] Furthermore, by setting the length dimension L1 of first finger hole 12 and second finger hole 22 in the longitudinal direction to 50 mm or more and 80 mm or less, kitchen scissors 1 can be used by inserting three or more of second through fifth fingers F2 to F5 into the finger hole opposite the one into which first finger F1 is inserted. In this case, as shown in Fig. 8, kitchen scissors 1 are used by grasping both inner portions 131, 231 with the entire palm, but because thickness dimension T1 is as described above and inner portions 131, 231 have a tapered shape, the longitudinal direction of kitchen scissors 1 can be oriented in a direction along the front of the user even when the wrist is not bent, as shown in Fig. 7.

[0050] Furthermore, the thickness of the portion of the connecting portion between the inner portion 131, 231 and the outer portion 132, 232 in the first scissors section 10 and the second scissors section 20 on the side of the first finger hole 12 or the second finger hole 22 is gradually reduced toward the first finger hole 12 or the second finger hole 22, and a seamless slope is formed from the inner portion 131, 231 toward the connecting portion, so that the shape follows the shape of the ball of the foot and can reduce the load applied to the ball of the foot during use, making it less tiring to use for long periods of time or when cutting hard ingredients.

[0051] Therefore, the kitchen scissors 1 can be made to fit the hand well, be easy to use, and allow easy application of cutting force, and furthermore, reduce fatigue even when used for long periods of time or when cutting hard ingredients.

[0052] (2) The width W2 at the connecting portion on the rear end side of the inner portion 131, 231 and the outer portion 132, 232, that is, at the rear end boundary 133b, 233b, is set to 9 mm or more and 17 mm or less.

[0053] 7 and 8, of the connecting portions on the rear end of the first scissors section 10 and the second scissors section 20, the ball of the thumb comes into contact with the first scissors section 10 on the side where the first finger F1 is inserted, and the tip of the fifth finger F5 comes into contact with the other second scissors section 20. For this reason, by providing a width to the dimension W2 of this section, it is possible to ensure a space for the fifth finger F5 in addition to providing a comfortable grip for the ball of the thumb, and to create a structure that makes it difficult for the fifth finger F5 to get caught between the two grips.

[0054] (3) At the connecting points on the rear end of the inner portion 131, 231 and the outer portion 132, 232, the contours of the first finger hole 12 and the second finger hole 22 are rounded in an R-shape, and the radius of curvature of the R-shape is 4 mm or more and 10 mm or less.

[0055] The connecting point on the rear end is the location where the ball of the thumb or the tip of the fifth finger F5 comes into contact. For this reason, by making the connecting point on the rear end R-shaped and setting the radius of curvature of the R-shape to be 4 mm or more and 10 mm or less, the ball of the thumb and the fifth finger F5 can feel softer, making the shape easier to use and less tiring.

[0056] (4) The hit points 134, 234 and the position WL where the width dimension W1 is greatest are both located within the ranges of the second region (R2) and the third region (R3), and preferably located at the same position in the longitudinal direction.

[0057] In this way, by forming hit points 134, 234 at or near position WL where width dimension W1 is greatest, hit points 134, 234 can be positioned at or near the position where the greatest force is applied when cutting food. As a result, the load applied to inner portions 131, 231 can be received by hit points 134, 234, ensuring the strength of first grip 13 and second grip 23.

[0058] (5) The dimension T2 in the thickness direction of the outer portions 132, 232 is set to 5 mm or more and 10 mm or less throughout the entire outer portions 132, 232.

[0059] In this way, by setting the thickness of outer portions 132, 232 and forming inner portions 131, 231 with a thick wall, and by making outer portions 132, 232 thinner, it is possible to give first grip 13 and second grip 23 a well-balanced shape, reduce the overall weight, and alleviate the appearance of being bulky. When kitchen scissors 1 are used, a force is applied in a twisting direction around the center line, but by making outer portions 132, 232 thinner, outer portions 132, 232 can bend in the thickness direction based on the twisting force, making them easier to fit in the hand and less likely to cause pain in the hand.

[0060] (6) The center of gravity of the kitchen scissors 1 in the longitudinal direction is located rearward of the position TL where the thickness dimension T1 is greatest.

[0061] In this way, by positioning the longitudinal center of gravity of kitchen scissors 1 rearward of position TL, i.e., on the opposite side of first blade 11 and second blade 21, when kitchen scissors 1 are placed on a table, the cutting edges can be raised so that they do not come into contact with the table. This allows the blades of kitchen scissors 1 to be kept clean when used to cut ingredients.

[0062] (7) The kitchen scissors 1 of this embodiment fit the hand well and are easy to use, and are designed to make it easy to apply cutting force and reduce fatigue even when used for long periods of time or when cutting hard ingredients. This allows the kitchen scissors 1 to be used for a variety of purposes for a long period of time, reducing waste and contributing to Goal 12 of the SDGs, "Responsible Consumption and Production." Furthermore, because the kitchen scissors 1 are easy for everyone to use, they can contribute to Goal 10 of the 17 Sustainable Development Goals (SDGs) adopted at the United Nations Summit, "Reduced inequalities within and among countries."

[0063] (Other embodiments) The present disclosure is not limited to the above-described embodiments and can be modified as appropriate within the scope of the claims. In the above embodiments, it goes without saying that the elements constituting the embodiments are not necessarily essential unless they are specifically stated as essential or are clearly considered essential in principle. Furthermore, in the above embodiments, when numerical values ​​such as the number, value, amount, and range of components are mentioned, they are not limited to the specific number unless they are specifically stated as essential or are clearly limited to a specific number in principle. Furthermore, in the above embodiments, when the shape, positional relationship, etc. of components are mentioned, they are not limited to the shape, positional relationship, etc. unless they are specifically stated or are clearly limited to a specific shape, positional relationship, etc. in principle.

[0064] For example, in the above embodiment, the first scissors portion 10 and the second scissors portion 20 are shaped to be rotationally symmetrical about the center line, but they do not necessarily have to be rotationally symmetrical. [Explanation of symbols]

[0065] 1...kitchen scissors, 10, 20...first and second scissors parts, 11, 21...first and second blades, 12, 22...first and second finger holes, 13, 23...first and second grips, 14, 24...scissors body, 15, 25...claws, 30...shank, 131, 231...inner part, 132, 232...outer part, 132a, 232a...opposing part, 132b, 232b...rear end side part, 133a, 233a...front end boundary which becomes the connecting point, 133b, 233b...rear end boundary which becomes the connecting point, 134, 234...hit point, C1...rotation center, F1 to F5...first to fifth fingers

Claims

[Claim 1] A pair of kitchen scissors that are opened and closed by rotating around a rotation center (C1) with one direction being the longitudinal direction, The scissors are provided with a first scissors part (10) and a second scissors part (20) each having a blade (11, 21) on one side in the longitudinal direction with respect to the rotation center and a grip (13, 23) having a finger hole (12, 22) on the other side; The grips of the first scissors section and the second scissors section each have an inner section (131, 231) that extends in the longitudinal direction and is a portion to be gripped, and an outer section (132, 232) that is connected to the inner section and is located on the outer side of the fingers, The direction in which the blades of the first scissors portion and the second scissors portion overlap is defined as a thickness direction, and the direction perpendicular to the longitudinal direction and the thickness direction is defined as a width direction, Among the connecting points (133a, 133b, 233a, 233b) between the inner part and the outer part of the first scissors part and the second scissors part, the portion of the connecting point (133b, 233b) on the rear end side far from the blade has a dimension gradually reduced in the thickness direction toward the finger hole side, is seamlessly connected from the inner part to the connecting point on the rear end side, and is inclined with respect to a plane parallel to the longitudinal direction and the width direction, The portion of the inner part where the finger hole is located has a tapered shape in which the dimension (T1) in the thickness direction decreases as it moves away from the rotation center, and the dimension (T1L) at the position (TL) where the dimension in the thickness direction is largest is 13 mm or more and 25 mm or less, and the dimension (T1S) at the position (TS) where the dimension is smallest is 7 mm or more and 13 mm or less, and the dimension (W1) in the width direction from the finger hole side of the inner part of the first scissors part to the finger hole side of the inner part of the second scissors part is 20 mm or more and 30 mm or less, In the longitudinal direction, the dimensions (L1) of the finger holes in the first scissors part and the second scissors part from the side closest to the rotation center to the side farthest from the rotation center are both 50 mm or more and 80 mm or less, At the connecting portion on the rear end side, the contour of the finger hole is rounded in an R shape, and the radius of curvature of the R shape is 4 mm or more and 10 mm or less, The dimension (T2) in the thickness direction of the outer portion is smaller than the dimension (T1S) at the position of the inner portion where the dimension in the thickness direction is smallest, and is 5 mm or more and 10 mm or less throughout the outer portion, At least one of the grips of the first scissors section and the second scissors section is provided with a hit point (134, 234) at a position between the respective inner sections; When the finger hole is divided into four regions in the longitudinal direction, the regions are designated as a first region (R1), a second region (R2), a third region (R3), and a fourth region (R4) in order from the rotation center side. The position where the dimension (W1) in the width direction at the position where the finger hole is formed is the largest and the hit point are both located within the ranges of the second region and the third region, Furthermore, the outer portions of the grips of the first scissors part and the second scissors part have an inner edge side facing the finger hole that is rounded to have an elliptical cross section, and a wall surface on the opposite side to the finger hole has a circular cross section with a larger radius of curvature than the inner edge side, resulting in a semi-elliptical cross section, Kitchen scissors, wherein a rear end side portion (132b, 232b) of the outer portion that is the rear end side portion has a dimension (W2) larger in a direction extending in a normal direction to a tangent direction of the outline of the finger hole than an opposing portion (132a, 232a) of the outer portion that is the portion opposing the inner portion.

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