Scissors

Abstract

To provide disassembled scissors having polygonal shaft holes and capable of being stably used. [Solution] The head of the scissors shaft has a shape with rod-shaped parts protruding radially from the center toward each corner of the regular polygon of the shaft hole, the number of the rod-shaped parts being equal to the number of the corners, the width of the rod-shaped parts is smaller than the distance between adjacent points on the circumference of the shaft rod among the points obtained by dividing the circumference of the shaft rod equally by the number of the corners of the regular polygon, and one or more of the rod-shaped parts have a different length and / or width from the other rod-shaped parts, and further, the shaft hole is provided with radial notches similar in shape to the head so that the head can pass through when the blade parts of the two thin plates are in a predetermined open state, and the notches have a radial shape starting from a part excluding the midpoints of each side so that the cylindrical shaft body is positioned and supported at the midpoints of each side of the regular polygon of the shaft hole. Scissors with this configuration do not wobble and are not easily affected by the adhesion of sap and resin.

Description

[Technical field]

[0001] The present invention relates to scissors in which upper blades and lower blades can be separated. [Background technology]

[0002] Conventionally, scissors with separable upper and lower blades are known (see Patent Document 1). In order to open and close the scissors, the head of the shaft attached to the lower blade is processed into a minus shape when viewed from above, that is, into an oval shape, and further, a notch is provided in the shaft hole provided in the upper blade through which the oval head passes, so that the scissors can be removed when the upper blade and lower blade are opened to a predetermined angle.

[0003] Incidentally, the applicant of the present application has proposed an invention in which the shaft hole in the upper blade is made polygonal, as shown in Patent Document 2, thereby ensuring a passage between the cylindrical part of the shaft body and the shaft hole, making it easy to clean even if sap resin or the like adheres to it. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 01-308583 [Patent Document 2] Patent No. 6425365 Summary of the Invention [Problem to be solved by the invention]

[0005] When the shaft hole provided in the upper blade is polygonal, the cylindrical shaft body is positioned and supported at the midpoints of each side of the polygon. Note that, in this invention, the term "positioning and support" means supporting the shaft body in a state in which the upper blade and the lower blade can be opened and closed, that is, supporting them with a light contact force or with a small gap.

[0006] If the above-mentioned conventional technology is applied to scissors with this structure, and the shaft head is machined into a minus shape when viewed from above, that is, into an oval shape, and a similarly shaped notch is added to the polygonal shaft hole of the upper blade through which this oval head passes, a large part of the midpoints of each side of the polygon that supports the cylindrical part of the shaft body is removed. As a result, there is a problem that the shaft body may shift inside the shaft hole while the scissors are in use (see Figures 7 and 8 for comparison with the present invention).

[0007] The present invention solves this problem by providing scissors in which the upper and lower blades can be disassembled while ensuring a passage between the polygonal shaft hole and the cylindrical shaft body and reducing the risk of the shaft body shifting. [Means for solving the problem]

[0008] In order to achieve the above object, the present invention provides a pair of scissors constructed by pivoting two thin plate materials, each having a blade portion and a shaft hole at the base end side of the blade portion, with a shaft passing through the shaft hole, wherein a regular polygonal shaft hole is opened in one of the two thin plate materials, one end of the shaft is fastened to the shaft hole of the thin plate material on the side not provided with the regular polygonal shaft hole and a head is provided on the other end, the shaft body has a cylindrical shape that is inscribed or has a gap between each side of the regular polygonal shaft hole in a rotatable state, and the head has rod-shaped portions that protrude radially from the center toward each corner of the regular polygonal shaft hole, the number of which is the number of corners, the width of the rod-shaped portions is smaller than the distance between adjacent points on the circumference of the shaft body obtained by dividing the outer circumference of the shaft body equally by the number of corners of the regular polygon, and one or both of the rod-shaped portions are different from those of the other rod-shaped portions; the regular polygonal shaft hole is provided with radial notches similar in shape to the head portion which allow the head portion to pass therethrough when the blade portions of the two thin plate materials are in a predetermined open state; and the notches have a radial shape which starts from a portion excluding the midpoints of each side so that a cylindrical shaft body is positioned and supported at the midpoints of each side of the regular polygonal shaft hole.

[0009] Preferably, one of the two thin plate materials has a regular rectangular shaft hole, and the head of the shaft has a shape with four rod-shaped portions with a width shorter than the radius of the shaft body multiplied by the square root of 2, and one or more of the rod-shaped portions have a length and / or width different from those of the other rod-shaped portions, and the cutouts in the shaft hole have a radial cutout shape starting from a portion excluding the midpoints of each side so that the cylindrical shaft body is positioned and supported at the midpoints of each side of the regular rectangle of the shaft hole.

[0010] Preferably, the two thin plates have recesses in opposing portions near the axis, and a groove communicating with the recesses and extending to the blade portion. Effect of the Invention

[0011] The scissors of the present invention, which can be separated into an upper blade and a lower blade, can be used stably while ensuring a passage between the polygonal hole in the upper blade and the cylindrical shaft body, thereby reducing the risk of the shaft shifting during use. [Brief description of the drawings]

[0012] [Figure 1] 1 is a front view of scissors according to an embodiment of the present invention; [Diagram 2] A diagram showing the scissors opened to the extent necessary for disassembly. [Diagram 3] (a) is a perspective view of the lower blade of scissors, and (b) is a perspective view from the back. [Figure 4] (a) is a perspective view of the upper blade of scissors, and (b) is a perspective view from the back. [Diagram 5] (a) shows the head of the shaft attached to the lower blade, and (b) shows the shaft hole in the upper blade. [Figure 6] This figure shows that the shaft body is exposed through the cutout, making it easy to remove sap resin and other impurities. [Figure 7]In the case where the shaft hole 3b is a triangle to a pentagon, (a), (c), and (e) are comparative diagrams showing cases where the shaft head of the present invention is used, and (b), (d), and (f) are comparative diagrams showing cases where the shaft head is made using conventional technology. [Figure 8] In the case where the shaft hole 3b is hexagonal or heptagonal, (a) and (c) are comparative diagrams in which the shaft head of the present invention is used, and (b) and (d) are comparative diagrams in which the conventional technology is used for the shaft head. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] The scissors of the present invention have a polygonal shaft hole and a passage between the shaft having a cylindrical body, and are configured so that the upper blade portion and the lower blade portion can be separated without compromising the stability of the passage and the shaft. The head of the shaft has a rod-shaped portion that protrudes radially from the center toward each corner of the regular polygon of the shaft hole, i.e., protrudes at each angle obtained by dividing 360 degrees by the number of corners, and the width of the rod-shaped portion is smaller than the distance between adjacent points on the outer circumference of the shaft rod among the points obtained by equally dividing the outer circumference by the number of corners of the regular polygon, and one or more of the rod-shaped portions have a different length and / or width from the other rod-shaped portions. The regular polygon shaft hole is provided with a radial cutout similar to the head, which allows the head to pass when the blade portions of the two thin plates are in a predetermined open state. Furthermore, the cutout has a radial cutout shape starting from a portion excluding the midpoint of each side so that the cylindrical shaft body is positioned and supported at the midpoint of each side of the regular polygon shaft hole.

[0014] Hereinafter, an embodiment of scissors of the present invention will be described with reference to the drawings. FIG. 1 shows scissors 1 according to an embodiment. Scissors 1 are composed of two thin plates 2 and 3 each about 20 cm long. Thin plate 2 has a lower blade 2a about 7 cm long, a shaft 2b fastened to a shaft hole at the base end side of lower blade 2a, and a grip 2c about 11 cm long for opening and closing. Thin plate 3 has an upper blade 3a about 7 cm long, a shaft hole 3b at the base end side of upper blade 3a, and a grip 3c about 11 cm long for opening and closing. Thin plate 2 is pivoted to thin plate 3 by shaft 2b passing through shaft hole 3b, and a user of scissors 1 opens and closes lower blade 2a and upper blade 3a using grips 2c and 3c.

[0015] 2 shows the state where the upper blade portion 3a of the scissors 1 is opened to a predetermined angle. At this angle, the head of the shaft 2b of the thin plate material 2 can pass through the shaft hole 3b of the thin plate material 3, and the thin plate material 2 having the lower blade portion 2a and the thin plate material 3 having the upper blade portion 3a can be separated.

[0016] FIG. 3(a) is a perspective view showing the configuration of the thin plate material 2, and (b) is a perspective view showing the back surface side. The thin plate material 2 is composed of a lower blade portion 2a, a shaft 2b, and a grip 2c. The shaft 2b is composed of a cross-shaped head portion 2d and a cylindrical shaft body 2e with a diameter of about 5 mm. A base end portion 2f of the shaft body 2e is fixed in a shaft hole 2g provided in the thin plate material 2 so as not to rotate.

[0017] FIG. 4(a) is a perspective view showing the configuration of the thin plate material 3, and (b) is a perspective view showing the back surface side. The thin plate material 3 is composed of an upper blade portion 3a, a shaft hole 3b formed in the shape of a regular quadrangle (square; hereinafter, referred to as a regular quadrangle to match the term regular polygon) with each side of approximately 5.1 mm, and a grip 3c. The regular quadrangle-shaped hole 13 of the shaft hole 3b (shown by dotted lines in Fig. 5(b)) further has radial notches 14 (see Fig. 5(b)) similar in shape to the head 2d of the shaft 2b provided in the thin plate material 2, which enable the head 2d to pass through, provided toward each corner of the regular quadrangle.

[0018] Compared to scissors according to, for example, the applicant's invention (Patent No. 6425365), scissors 1 have the remarkable advantage that, because notch 14 (see FIG. 5(b)) provided in shaft hole 3b opens a larger communication passage between shaft body 2e and the outside, even if sap resin adheres to shaft body 2e, it is less likely to accumulate between thin plate materials 2, 3. As a result, scissors 1 are less susceptible to the effects of sap resin during use and are easier to clean.

[0019] As shown in FIG. 3(a), a recess 2h is provided at the base end of the shaft 2b, and a groove 2i communicating with this recess 2h is provided in the lower blade portion 2a. As shown in FIG. 4(b), a recess 3d is provided around the shaft hole 3b, and a groove 3e leading to this recess 3d is provided in the upper blade portion 3a. By adopting this configuration, the recess 2h and groove 2i shown in Figure 3(a), the recess 3d and groove 3e shown in Figure 4(b), and the passage between the equilateral rectangular shaft hole 3b with radial cutouts 14 (see Figure 5(b)) and the shaft body 2e further reduce the effects of sap resin and the like adhering to the shaft body 2e, and further have the remarkable effect of facilitating cleaning without disassembly.

[0020] FIG. 5 is a partially enlarged view of the scissors 1 in the state shown in FIG. 2, where (a) is a view of the head 2d of the shaft 2b of the thin plate material 2 from above, and (b) is a view of the shaft hole 3b of the thin plate material 3 from above.

[0021] As shown in FIG. 5(a), the head 2d has a shape having rod-shaped portions b1, b2, b3, and b4, which protrude radially from the center toward each corner of the equilateral quadrangle of the shaft hole 3b (see the equilateral quadrangle 13 drawn by dotted lines in FIG. 5(b)), i.e., protrude at intervals of 360 degrees / 4=90 degrees, and have a shape of a cross in this embodiment. The widths W1, W2, W3, and W4 of the rod-shaped portions b1, b2, b3, and b4 are set smaller than the distance L1 between adjacent points on the circumference among the points 2j, 2k, 2l, and 2m obtained by equally dividing the outer circumference of the shaft rod by the number of corners of the equilateral quadrangle. In this embodiment, the distance L1 is the length obtained by multiplying the radius of the cylindrical shaft body 2e by the square root of 2.

[0022] Furthermore, if all the rod-shaped portions b1, b2, b3, and b4 were the same in length and width, the upper blade portion and the lower blade portion would become separable every time the scissors are rotated 90 degrees, which is the value obtained by dividing 360 degrees by the number of corners of the polygon (in the case of a regular quadrilateral, 90 degrees), creating a new problem that would affect use. Therefore, in the scissors of the present invention, one or both of the length and width of the multiple rod-shaped portions b1, b2, b3, and b4 are set to a value different from that of the other rod-shaped portions.

[0023] In this embodiment, the length and width of the two rod-shaped parts b1 and b3 are made shorter than the other two rod-shaped parts b2 and b4. This prevents the upper blade part 3a of the scissors 1 from being disassembled when it is in the state shown in FIG. 1, but allows the thin plate material 2 of the lower blade part 2a and the thin plate material 3 of the upper blade part 3a to be disassembled when it is rotated 90 degrees to the state shown in FIG. 2. If the length and width of only one rod-shaped part b1 is set shorter than the other rod-shaped parts b2 to b4, the scissors cannot be disassembled unless the scissors are opened to a predetermined degree. The length and width of the rod-shaped parts to be changed may be arbitrarily set in consideration of the expected opening degree required for the scissors.

[0024] As shown in FIG. 5(b), the shaft hole 3b is provided with a regular polygonal hole 13 shown by the dotted line, and further provided with radial notches 14 of a similar shape to the head 2d, which allow the head 2d to pass when the blades 2a, 3a of the two thin plate materials 2, 3 are in a predetermined open state. The shaft body 2e is inscribed in each side of the regular square hole 13 in a rotatable state or with a gap. In detail, when the diameter of the shaft body 2e is 5 mm, one side of the regular square hole 13 of the shaft hole 3b is set to 5.1 mm. The value of the gap varies depending on the size and use of the scissors 1, but is set to a value of, for example, 1 mm or less, so that the shaft misalignment is not felt during use and the scissors can be opened and closed easily.

[0025] The notches 14 of the shaft hole 3b are radially cut out from the portion excluding the midpoints 3f, 3g, 3h, and 3i of each side so that the cylindrical shaft body 2e is positioned and supported by the midpoints 3f, 3g, 3h, and 3i of each side of the regular polygon 13 of the shaft hole 2d, that is, the midpoints 3f, 3g, 3h, and 3i abut the shaft body 2e with a light force or are disposed with a small gap. The shape of the regular polygon hole 13 plus the notches 14 is similar to the shape of the head 2d, and in this embodiment, W5 and W7 are set to values ​​that allow the rod-shaped portions b1 and b3 of the shaft head 2d to pass through, and W6 and W8 are set to values ​​that allow the rod-shaped portions b2 and b4 of the shaft head 2d to pass through. The widths W5, W6, W7, and W8 of the cutout portions through which the rod-shaped portions b1, b2, b3, and b4 pass are smaller than the distance L2 between adjacent midpoints 3f, 3g, 3h, and 3i of the corners of the regular polygon.

[0026] In the scissors of the present invention, one or more of the rod-shaped parts has a length and / or width different from the other rod-shaped parts. By adopting this configuration, the head of the shaft has an asymmetric shape, and it can be set so that it cannot be separated unless it opens to a predetermined degree.

[0027] FIG. 6 is a partial perspective view of the scissors 1 in the closed state as shown in FIG. 1, and shows how the shaft body 2e of the shaft 2b of the thin plate material 2 is exposed to the outside by providing a notch 14 in the shaft hole 3b of the thin plate material 3 as shown in the figure. For example, even if sap tar adheres to the shaft 2b when the scissors 1 are used in an orchard, the parts near the midpoints 3f, 3g, 3h, and 3i of each side of the regular polygon 13 of the shaft hole 2d act to scrape off the resin tar from the shaft body 2e every time the scissors 1 are opened or closed. By exposing the shaft body 2e, the resin tar scraped off from the shaft body 2e is pushed out to the outside every time the scissors 1 are opened or closed. This almost completely eliminates the problem of the scissors 1 becoming clogged with sap tar during use, and provides the remarkable effect of being able to maintain light opening and closing operations for a long time, that is, being able to be used for a long time without maintenance.

[0028] Although scissors 1 have a notch 14 in shaft hole 3b, the support point of shaft body 2e is not reduced by providing said notch, and as a result, the risk of the shaft shifting during use is reduced, allowing for stable use. The effect of this will be demonstrated with several examples.

[0029] 7 and 8 are comparative diagrams showing the case where the shaft head of the present invention is used and the case where the shaft head is made of a conventional technology, when the shaft hole 3b is a regular triangle to a regular heptagon. Among the rod-shaped parts extending radially from the shaft head, the rod-shaped parts which are set shorter in length and width than the other rod-shaped parts are shown by solid lines inside dotted lines for easy understanding. When the head of the present invention is used, the contact points between the midpoints of each side of the polygon of the shaft hole 3b and the shaft body 2e are maintained, whereas when the conventional head is used, a considerable number of the midpoints of each side of the shaft hole 3b are removed. Furthermore, when scissors 1 are used, a gouging force is applied to shaft 2b, but compared to when the thickness of the shaft head is uniform, by providing the same number of rod-shaped sections as the number of corners of the regular polygon, the strength of the shaft head is increased and stable use over a longer period of time is possible, compared to when the shaft head is machined into a minus "-" shape.

[0030] Fig. 7(a) shows a case where the head of a shaft having a triangular hole is machined into a shape with three rod-shaped parts protruding radially toward each corner, and (b) shows a case where the head of a shaft having a triangular hole is machined into a minus "-" shape. In the case of the embodiment according to the present invention shown in Fig. 7(a), all three midpoints 4a-4c of each side that position the shaft body 2e remain, whereas in the case of the conventional example shown in Fig. 7(b), only one midpoint 4c remains.

[0031] Fig. 7(c) shows the present embodiment shown in Fig. 1 to Fig. 6 in the case where the shaft hole is rectangular and the head of the shaft is machined into a shape with four rod-shaped parts protruding radially toward each corner, and Fig. 7(d) shows the case where the head of the shaft is machined into a minus "-" shape when the shaft hole is rectangular. In the case of the present embodiment shown in Fig. 7(c), all four midpoints 5a to 5d of each side that position the shaft body 2e remain, whereas in the conventional example shown in Fig. 7(d), only two midpoints, 5a and 5c, remain.

[0032] Fig. 7(e) shows a case where the head of the shaft is machined into a shape with five rod-shaped parts protruding radially from each corner when the shaft hole is pentagonal, and (f) shows a case where the head of the shaft is machined into a minus "-" shape when the shaft hole is pentagonal. In the case of the embodiment of the present invention shown in Fig. 7(e), all five midpoints 6a-6e of each side that position the shaft body 2e remain, whereas in the case of the conventional example shown in Fig. 7(f), only three midpoints 6a, 6b, and 6d remain.

[0033] Fig. 8(a) shows a case where the head of a shaft is machined into a shape having six rod-shaped parts protruding radially from each corner when the shaft hole is hexagonal, and (b) shows a case where the head of a shaft is machined into a minus "-" shape when the shaft hole is hexagonal. In the case of the embodiment of the present invention shown in Fig. 7(a), all six midpoints 7a-7f of each side that position the shaft body 2e remain, whereas in the case of the conventional example shown in Fig. 8(b), only two midpoints, 7b and 7e, remain.

[0034] Fig. 8(c) shows a case where the shaft hole is heptagonal and the head of the shaft is machined into a shape with seven rod-shaped parts protruding radially from each corner, and (d) shows a case where the head of the shaft is machined into a minus "-" shape when the shaft hole is heptagonal. In the case of the embodiment of the present invention shown in Fig. 8(c), all seven midpoints 8a to 8g of each side that position the shaft body 2e remain, whereas in the case of the conventional example shown in Fig. 8(d), only three, 8a, 8b, and 8e, remain.

[0035] Furthermore, as shown in FIG. 8, the more polygons in shaft hole 3b are increased and the more rod-shaped portions in shaft head 2d are increased, the more likely it is that the upper blade portion will come off when scissors 1 is rotated slightly to open it.

[0036] To solve this problem, as shown in Fig. 5 (and the solid outline inside the dotted line in Fig. 7), one or more of the rod-shaped parts are made to have a different length and / or width from the other rod-shaped parts. By adopting this configuration, it becomes possible to determine the opening degree that allows the upper blade part and the lower blade part to be separated, and the above problem can be solved.

[0037] The present invention is not limited to the configurations of the above-mentioned various embodiments, and various modifications are possible within the scope of the invention. For example, the shape of the tip of the rod-shaped portion radially provided on the head 2d of the shaft may be a pointed star for decorative purposes. [Industrial Applicability]

[0038] The scissors of the present invention can be used in orchards where sap resin easily accumulates, and can also be used for cooking. The structure that is not easily affected by sap resin when used in orchards has the advantage that it can extend the period during which the scissors can be opened and closed easily by suppressing the effects of sand or clay in environments where sap resin, fine sand or clay easily accumulates, or the effects of salt bite when used at the beach. [Explanation of symbols]

[0039] 1. Scissors 2, 3 Thin plate material 2a Lower blade part 2b axis 2c, 3c grip 2d shaft head 2e Shaft body 2f Base end of shaft 3a Upper blade part 3b Shaft hole b1~b4 Rod-shaped part 13 Regular polygon hole 14 Cutout 2g, 3d recess 2h, 3e grooves

Claims

1. A pair of scissors is constructed by pivotally supporting two thin plates, each having a blade portion and an axial hole at the base end of the blade portion, on an axis passing through the axial hole, A regular polygonal shaft hole is opened in one of the two thin plate materials, One end of the shaft is fastened to the shaft hole of the thin plate material on the side where the regular polygonal shaft hole is not provided, and the other end is provided with a head, and the shaft body has a cylindrical shape that is inscribed or has a gap between it and each side of the regular polygonal shaft hole in a rotatable state, the head portion has rod-shaped portions projecting radially from the center toward each corner of the regular polygonal shaft hole, the number of which is the same as the number of corners of the regular polygon, the width of each rod-shaped portion being smaller than the distance between adjacent points on the circumference of the shaft body obtained by dividing the circumference of the shaft body equally by the number of corners of the regular polygon, and one or more of the rod-shaped portions has a length and / or a width that differs from that of the other rod-shaped portions, the regular polygonal shaft hole is provided with radial notches similar in shape to the heads, which allow the heads to pass through when the blade portions of the two thin plate materials are in a predetermined open state; Furthermore, the scissors are characterized in that the notches have a radial shape starting from the part excluding the midpoints of each side so that the cylindrical shaft body is positioned and supported at the midpoints of each side of the regular polygonal shaft hole.

2. The scissors according to claim 1, One of the two thin plates has a square shaft hole formed therein, the head of the shaft has a shape including four rod-shaped portions each having a width shorter than the length obtained by multiplying the radius of the shaft body by the square root of 2, and one or more of the rod-shaped portions has a length and / or a width different from the other rod-shaped portions; The scissors are characterized in that the notches in the shaft hole have a radial shape, starting from the part excluding the midpoints of each side of the regular rectangle of the shaft hole, so that the cylindrical shaft body is positioned and supported at the midpoints of each side.

3. The scissors according to claim 1 or claim 2, characterized in that the two thin plates have recesses in the opposing portions near the shafts, and grooves that communicate with the recesses and extend to the blade portions.

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