JP7603192B1 - Scissors - Google Patents

Abstract

To provide scissors having polygonal shaft holes that can be disassembled for stable use.
[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 cutout 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.
[Selected figure] Figure 2

Description

The present invention relates to scissors whose upper and lower blades can be separated.

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 machined into a minus shape when viewed from above, i.e., an oval shape, and further, a notch is provided in the shaft hole 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 set angle.

Incidentally, the applicant has proposed an invention in which the shaft hole in the upper blade is made polygonal, as shown in Patent Document 2, to ensure a passage between the cylindrical part of the shaft body and the polygonal shaft hole, making it easy to clean even if resin or other substances adhere to the shaft.

Japanese Patent Application Publication No. 01-308583 Patent No. 6425365

When the shaft hole 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 this invention relates to scissors, and the term "positioning and support" means supporting the shaft body in a state where the upper blade and lower blade can be opened and closed, that is, supporting it with a light abutment force or with a small gap.

When 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, i.e., 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 midpoint 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 comparison diagrams with the present invention in Figures 7 and 8).

The present invention aims to solve this problem by providing scissors with separable upper and lower blades that ensure a passage between the polygonal shaft hole and the cylindrical shaft body while minimizing the risk of the shaft body shifting.

In order to achieve the above object, the present invention provides scissors that are constructed by pivoting two thin plate materials, each having a blade portion and an axial hole at the base end side of the blade portion, with an axis that passes through the axial hole, in which a regular polygonal axial hole is opened in one of the two thin plate materials, one end of the axis is fastened to the axial hole of the thin plate material on the side that does not have the regular polygonal axial hole, and a head is provided at the other end, the axis body has a cylindrical shape that is inscribed or inscribed with a gap in a rotatable state on each side of the regular polygonal axial hole, and the head has rod-shaped portions that protrude radially from the center toward each corner of the regular polygonal axial hole, the number of which is the number of corners. The width of the rod-shaped portion is smaller than the distance between adjacent points on the circumference of the shaft body, among the points 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 length and width of one or more of the rod-shaped portions are different from those of the other rod-shaped portions. The regular polygon shaft hole is provided with radial notches similar in shape to the head, which allow the head to pass through when the blade portions of the two thin plates are in a predetermined open state. Furthermore, 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 polygon shaft hole.

Preferably, one of the two thin plates has a regular rectangular shaft hole, the head of the shaft has four rod-shaped parts 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 parts have a different length and/or width from the other rod-shaped parts, and the cutouts in the shaft hole are radially cut out from the parts 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.

Preferably, the blade has a recess in the opposing portion of the two thin plates near the axis, and a groove that connects to the recess and extends to the blade.

The scissors of the present invention, which can be separated into upper and lower blades, can be used stably while ensuring a passage between the polygonal hole in the upper blade and the cylindrical shaft body, and reducing the risk of the shaft shifting during use.

1 is a front view of scissors according to an embodiment of the present invention; A diagram showing the scissors opened to the extent necessary for disassembly. FIG. 2A is a perspective view of the lower blade of scissors, and FIG. 2B is a perspective view of the lower blade from the back side. FIG. 2A is a perspective view of the upper blade portion of the scissors, and FIG. 2B is a perspective view of the upper blade portion from the back side. (a) shows the head of the shaft attached to the lower blade, and (b) shows the shaft hole of the upper blade. This figure shows that the shaft body is exposed through the cutout, making it easy to remove sap resin and other impurities. In the case where the shaft hole 3b is a triangle to a pentagon, (a), (c), and (e) are comparative diagrams showing the case where the shaft head of the present invention is used, and (b), (d), and (f) are comparative diagrams showing the case where the conventional technology is used for the shaft head. In the case where the shaft hole 3b is hexagonal or heptagonal, (a) and (c) are comparative diagrams showing the case where the shaft head of the present invention is used, and (b) and (d) are comparative diagrams showing the case where the conventional technology is used for the shaft head.

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 notch similar in shape to the head, which allows the head to pass through when the blade portions of the two thin plates are in a predetermined open state. Furthermore, the notch has a radial notch 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.

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. The scissors 1 are composed of two thin plates 2 and 3 each about 20 cm long. The 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 the lower blade 2a, and a grip 2c about 11 cm long for opening and closing. The thin plate 3 has an upper blade 3a about 7 cm long, a shaft hole 3b at the base end side of the upper blade 3a, and a grip 3c about 11 cm long for opening and closing. The thin plate 2 is pivoted to the thin plate 3 by the shaft 2b passing through the shaft hole 3b, and the user of the scissors 1 opens and closes the lower blade 2a and the upper blade 3a using the grips 2c and 3c.

Figure 2 shows the state in which the upper blade portion 3a of the scissors 1 is opened to a set 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 with the lower blade portion 2a and the thin plate material 3 with the upper blade portion 3a can be separated.

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

FIG. 4A is a perspective view showing the structure of the thin plate material 3, and FIG. 4B is a perspective view showing the back surface side.
The thin plate 3 is composed of an upper blade portion 3a, a shaft hole 3b formed in 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 (shown by dotted lines in Fig. 5(b)) of the shaft hole 3b 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 2, which allow the head 2d to pass through, provided toward each corner of the regular quadrangle.

The scissors 1 have a notch 14 (see FIG. 5(b)) in the shaft hole 3b that opens a larger communication passage between the shaft body 2e and the outside, so even if sap resin adheres to the shaft body 2e, it is less likely to accumulate between the thin plates 2 and 3. As a result, the scissors are less susceptible to the effects of sap resin during use and are easier to clean, which is a remarkable advantage.

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 shaft body 2e and regular rectangular shaft hole 3b with radial cutouts 14 (see Figure 5(b)) are provided, have the remarkable effect of further reducing the effects of sap resin and the like adhering to shaft body 2e and making it easier to clean without disassembly.

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

As shown in FIG. 5(a), the head 2d has a shape with rod-shaped portions b1, b2, b3, and b4 that 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., at intervals of 360 degrees/4=90 degrees, and have the number of corners (four), in this embodiment, a cross-shaped shape. 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.

Furthermore, if all rod-shaped portions b1, b2, b3, and b4 were the same length and width, the upper and lower blades would become separable every time the blades are rotated 90 degrees, which is the value calculated by dividing 360 degrees by the number of corners of the polygon (in the case of a regular square), creating a new problem of adverse effects during use. Therefore, in the scissors of the present invention, one or more of the rod-shaped portions b1, b2, b3, and b4 are set to have a length and/or width that is different from the other rod-shaped portions.

In this embodiment, the length and width of the two rod-shaped portions b1 and b3 are made shorter than the other two rod-shaped portions b2 and b4. This prevents the upper blade portion 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 portion 2a and the thin plate material 3 of the upper blade portion 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 portion b1 is set shorter than the other rod-shaped portions b2 to b4, the scissors can be set so that they cannot be disassembled unless they are opened to a predetermined degree. The number of rod-shaped portions to be changed in length and width can be set arbitrarily, taking into account the expected opening degree required for the scissors.

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 or has a gap in each side of the regular square hole 13 in a rotatable state. In more 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.

The notches 14 of the shaft hole 3b are radially cut out from the part excluding the midpoints 3f, 3g, 3h, and 3i of each side so that the cylindrical shaft body 2e is positioned and supported at 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 positioned 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 parts b1 and b3 of the shaft head 2d to pass through, and W6 and W8 are set to values that allow the rod-shaped parts b2 and b4 of the shaft head 2d to pass through. The widths W5, W6, W7, and W8 of the cutouts 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.

In the scissors of the present invention, one or more of the rod-shaped parts has a length and/or width that is 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.

Figure 6 is a partial perspective view of the scissors 1 in the closed state as shown in Figure 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 each 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 each 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, i.e., being able to be used for a long time without maintenance.

The scissors 1 have a notch 14 in the shaft hole 3b, but the support point of the shaft body 2e is not reduced by providing the notch, and as a result, the risk of the shaft shifting during use is reduced, allowing for stable use. Several examples will be presented to demonstrate this effect.

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 the conventional technology, when the shaft hole 3b is a regular triangle to a regular heptagon. Of 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 the scissors 1 are used, a gouging force is applied to the shaft 2b, but compared to when the thickness of the shaft head is uniform and the shaft head is machined into a minus shape, by providing the same number of rod-shaped sections as the number of vertices of the regular polygon, the strength of the shaft head is increased and stable use over a longer period of time is possible.

Figure 7(a) shows the case where the shaft hole is triangular and the head of the shaft is machined into a shape with three rod-shaped parts protruding radially towards each corner, while (b) shows the case where the head of the shaft is machined into a minus "-" shape when the shaft hole is triangular. In the case of the embodiment of the present invention shown in Figure 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 Figure 7(b), only one midpoint, 4c, remains.

Figure 7(c) shows the present embodiment shown in Figures 1 to 6, in which the shaft hole is square and the head of the shaft is machined into a shape with four rod-shaped parts protruding radially towards each corner, while (d) shows the case where the head of the shaft is machined into a minus "-" shape when the shaft hole is square. In the case of this embodiment shown in Figure 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 Figure 7(d), only two midpoints, 5a and 5c, remain.

Figure 7(e) shows the case where the shaft hole is pentagonal and the head of the shaft is machined into a shape with five rod-shaped parts protruding radially towards each corner, while (f) shows the 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 Figure 7(e), all five midpoints 6a to 6e of each side that position the shaft body 2e remain, whereas in the case of the conventional example shown in Figure 7(f), only three midpoints remain: 6a, 6b, and 6d.

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

Figure 8(c) shows the 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, while (d) shows the case where the shaft hole is heptagonal and the head of the shaft is machined into a minus "-" shape. In the case of the embodiment of the present invention shown in Figure 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 Figure 8(d), only three remain: 8a, 8b, and 8e.

As shown in Figure 8, the more polygons in the shaft hole 3b are increased and the more rod-shaped parts in the shaft head 2d are increased, the more likely it is that the upper blade will come off when the scissors 1 is rotated slightly to open them.

To solve this problem, as shown in Figure 5 (and in Figure 7, drawn with solid lines inside the dotted line), one or more of the rod-shaped parts have a length and/or width that differ 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, thereby solving the above problem.

The present invention is not limited to the configurations of the various embodiments described above, 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.

The scissors of the present invention can be used in orchards where sap resin is likely to build up, as well as for cooking. The structure that makes them less susceptible to the effects of sap resin when used in orchards has the advantage that they can be opened and closed easily for a longer period of time by reducing the effects of sap resin, as well as the effects of fine sand or clay in environments where sap resin, fine sand or clay, is likely to build up, or the effects of salt bite when used at the beach.

1 Scissors 2, 3 Thin plate material 2a Lower blade portion 2b Shaft 2c, 3c Grip 2d Shaft head 2e Shaft body 2f Base end portion of shaft 3a Upper blade portion 3b Shaft hole b1 to b4 Rod-shaped portion 13 Regular polygonal hole 14 Notch 2g, 3d Recess 2h, 3e Groove

Claims (3)

A pair of scissors is constructed by pivoting two thin plate materials, each having a blade portion and an axial hole at the base end side 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 polygon 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 each side of the regular polygon shaft hole in a rotatable state,
the head portion has rod-shaped portions protruding radially from a center toward each corner of the regular polygonal shaft hole, the number of the rod-shaped portions being equal to the number of corners of the regular polygon, the width of the rod-shaped portions being smaller than the distance between adjacent points on the circumference of the shaft body obtained by equally dividing the circumference by the number of corners of the regular polygon, and one or more of the rod-shaped portions have a length and/or a width different from those of the other rod-shaped portions,
the regular polygonal shaft hole is provided with a radial cutout similar in shape to the head portion, allowing the head portion to pass therethrough when the blade portions of the two thin plate materials are in a predetermined open state;
The scissors are further characterized in that the notches have a radial 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 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 a length obtained by multiplying the radius of the shaft body by the square root of 2, and at least one of the rod-shaped portions has a length and/or a width different from those of 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 2, characterized in that the two thin plates have recesses in opposing portions near the shafts, and grooves that communicate with the recesses and extend to the blade portions.