Scissors

Abstract

In order to achieve scissors that can be safely used by infants or the like even without a protective cover for covering a cutting-edge line, scissors 1 comprise a first body 10 having a first blade part 11 and a first handle part 13, and a second body 20 having a second blade part 21 and a second handle part 23. The first blade part 11 and the second blade part 21 are configured to be openable and closable. The first blade part 11 has a first blade tip portion 31, a first dull edge portion 14 that extends from the first blade tip portion 31 and is supported at both ends, and a first cutting-edge line portion 15 that is separated from the first dull edge portion 14 and extends from the first blade tip portion 31 toward the first blade part 11. Of both ends of the first cutting-edge line portion 15, only the end on the first blade tip portion 31 side is supported.

Description

scissors

[0001] The present invention relates to scissors and the like that can be used safely by small children and the like.

[0002] Various scissors have been devised in the past. Patent Document 1 describes a pair of safe scissors equipped with a roughly bag-shaped protective cover. The protective cover is attached to cover the blades of the scissors. The protective cover has a gap through which an object to be cut can be inserted.

[0003] Japanese Patent Application Laid-Open No. 2004-154206

[0004] Conventional scissors require a protective cover in addition to the scissors themselves, which increases the number of parts.

[0005] The present invention has been made in view of the above circumstances, and aims to realize scissors that can be used safely by small children and the like, even without a protective cover that covers the cutting edge.

[0006] In order to solve the above-mentioned problems, the first invention is a pair of scissors comprising a first main body portion having a first blade portion and a first handle portion, and a second main body portion having a second blade portion and a second handle portion, the first blade portion and the second blade portion being configured to be openable and closable, the first blade portion having a first cutting edge portion, a first ridge portion extending from the first cutting edge portion and supported at both ends, and a first blade line portion spaced apart from the first ridge portion and extending from the first cutting edge portion towards the first handle portion, and of both ends of the first blade line portion, only the first cutting edge portion side is supported.

[0007] In the second invention, in the first invention, the second blade portion has a second cutting edge portion, a second ridge portion extending from the second cutting edge portion and supported at both ends, and a second cutting edge line portion extending from the second cutting edge portion toward the second handle portion, spaced apart from the second ridge portion, and only the second cutting edge portion side of both ends of the second cutting edge portion is supported.

[0008] The third invention is the first or second invention, in which a guide portion is provided on the base side of the first cutting edge portion to move the second blade portion to the opposite side from the first blade portion when the second blade portion abuts against it, in order to prevent the first blade portion and the second blade portion from getting caught when the scissors are closed.

[0009] A fourth invention is the first or second invention, wherein the first main body portion has a first intermediate portion provided between the first blade portion and the first handle portion, and the second main body portion has a second intermediate portion provided between the second blade portion and the second handle portion, and further comprises a pin member inserted through the first intermediate portion and the second intermediate portion and rotatably connecting the first main body portion and the second main body portion, and a cover which is a part attached to the first intermediate portion by the pin member and covers from the outside the gap between the blade base side of the first cutting edge portion and the first intermediate portion.

[0010] A fifth aspect of the present invention is the scissors according to the first or second aspect of the present invention, further comprising an elastically deformable portion that biases the first blade portion and the second blade portion in a closing direction when the scissors are in a closed state.

[0011] In the present invention, at least in the first blade portion, the first cutting line portion has a cantilever structure in which only the first cutting edge side of both ends is supported, and further extends away from the first ridge portion, so that the first cutting line portion is easily bent toward the ridge portion. Therefore, while the pair of blade portions can cut soft materials such as paper, the first cutting line portion is configured to bend toward the ridge portion if the pair of blade portions accidentally pinch a finger with strong force, thereby reducing the risk of finger injury. Here, with scissors, the closer the finger contact point is to the blade base, the more likely the finger is to be cut, but the first cutting line portion is more easily bent toward the blade base. Therefore, the risk of finger injury at the blade base is also reduced. According to the present invention, scissors that can be used safely by children and others can be realized even without a protective cover covering the cutting line.

[0012] Fig. 1(a) is a perspective view of scissors according to an embodiment in a closed state as viewed from the front, and Fig. 1(b) is a perspective view of scissors in an open state as viewed from the front. Fig. 2(a) is a front view of a first main body of scissors according to an embodiment, Fig. 2(b) is a front view of a second main body, and Fig. 2(c) is a front view of a cover. Fig. 3(a) is a cross-sectional view A-A of Fig. 1(a), Fig. 3(b) is a cross-sectional view B-B of Fig. 1(a), and Fig. 3(c) is a cross-sectional view C-C of Fig. 1(b). Fig. 4(a) is a front view of scissors according to an embodiment with the cover removed, and Fig. 4(b) is an enlarged view of the area within the dashed line in Fig. 4(a).

[0013] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that the following embodiments are merely examples of the present invention and are not intended to limit the scope of the present invention, its applications, or its uses.

[0014] [Scissors Configuration] This embodiment is a pair of scissors 1 for infants. As shown in FIGS. 1( a) and 1(b), the scissors 1 include a first body 10 having a first blade 11 and a first handle 13, and a second body 20 having a second blade 21 and a second handle 23. The first blade 11 and the second blade 21 are configured to be openable and closable. The finger hole in the first handle 13 is smaller than the finger hole in the second handle 23 and is designed for the thumb. Fingers are inserted into the finger holes in each handle 13, 23 from the back side of the scissors in FIG. 1. The first blade 11 corresponds to a moving blade, and the second blade 21 corresponds to a stationary blade. The first body 10 and the second body 20 are made of hard resin. However, the bodies 10, 20 are not limited to being made of hard resin.

[0015] The first body portion 10 further includes a first intermediate portion 12 provided between the first blade portion 11 and the first handle portion 13. The first blade portion 11, the first intermediate portion 12, and the first handle portion 13 are integrally formed in the first body portion 10. The second body portion 20 further includes a second intermediate portion 22 provided between the second blade portion 21 and the second handle portion 23. The second body portion 20 is integrally formed with the second blade portion 21, the second intermediate portion 22, and the second handle portion 23. The scissors 1 further include a central screw 5 inserted through the first intermediate portion 12 and the second intermediate portion 22, and a pair of covers 6 attached to the intermediate portions 12 and 22 by the central screw 5. The central screw 5 corresponds to a pin member and rotatably connects the first body portion 10 and the second body portion 20.

[0016] When the scissors 1 are in a closed state, the first blade portion 11 and the first intermediate portion 12 overlap the front side of the second blade portion 21 and the second intermediate portion 22. On the outer circumferential surface of the first handle portion 13, the first intermediate portion 12 is connected to the front side in the thickness direction of the scissors 1 (upper side in FIG. 1 ), and the second intermediate portion 22 faces the back side in the thickness direction, with a gap between them. On the outer circumferential surface of the second handle portion 23, the second intermediate portion 22 is connected to the back side in the thickness direction of the scissors 1 (lower side in FIG. 1 ), and the first intermediate portion 12 faces the front side in the thickness direction, with a gap between them.

[0017] As shown in Fig. 2(a), the first blade portion 11 includes a first cutting edge portion 31, a first ridge portion 14 extending from the first cutting edge portion 31 to the first intermediate portion 12 and supported at both ends, and a first edge line portion 15 extending from the first cutting edge portion 31 toward the first intermediate portion 12 (toward the first handle portion 13) at a distance from the first ridge portion 14. As shown in Fig. 2(b), the second blade portion 21 includes a second cutting edge portion 32, a second ridge portion 24 extending from the second cutting edge portion 32 to the second intermediate portion 22 and supported at both ends, and a second edge line portion 25 extending from the second cutting edge portion 32 toward the second intermediate portion 22 (toward the second handle portion 23) at a distance from the second ridge portion 24.

[0018] As shown in Figures 2(a) and 2(b), each of the first ridge 14 and the second ridge 24 is formed in a straight rod shape when viewed from the front. The ridges 14, 24 are formed in a substantially rectangular shape when viewed in cross section (see Figure 3). The ridges 14, 24 are connected to the cutting edge portions 31, 32 on their cutting edge side and to the intermediate portions 12, 22 on their cutting base side.

[0019] Each of the first and second blade lines 15 and 25 is formed in a straight rod shape when viewed from the front. The blade lines 15 and 25 are formed in a generally rectangular shape when viewed in cross section (see FIG. 3). The blade lines 15 and 25 have a cantilever structure in which only the cutting edge portions 31 and 32 of both ends are supported. The cutting edge side of the blade lines 15 and 25 is connected to the cutting edge portions 31 and 32, and the base side faces the intermediate portions 12 and 22 with a gap X between them. The blade lines 15 and 25 extend from the cutting edge portions 31 and 32 to the vicinity of the intermediate portions 12 and 22.

[0020] The blade lines 15, 25 are provided substantially parallel to the ridges 14, 24. Spaces 16, 26 are formed between the blade lines 15, 25 and the ridges 14, 24 to allow the blade lines 15, 25 to bend toward the ridges 14, 24. The spaces 16, 26 are surrounded by the blade lines 15, 25, ridges 14, 24, cutting edges 31, 32, and intermediate portions 12, 22, except for the base side of the blade lines 15, 25. The width of the spaces 16, 26 can be, for example, 5 mm or more.

[0021] Each of the first cutting edge 31 and the second cutting edge 32 has a curved shape that is bent into a substantially U-shape. The outer periphery of the cutting edges 31, 32 is curved over the entire length. The outer periphery of the cutting edges 31, 32 has a larger curvature on the side of the cutting lines 15, 25 than on the side of the ridges 14, 24. Note that the outer periphery shape of the tips 31, 32 is not limited to that of this embodiment.

[0022] 3(a), an outer peripheral surface 15d of the first cutting edge portion 15 (the side opposite to the first ridge portion 14) and an outer peripheral surface 25d of the second cutting edge portion 25 (the side opposite to the second ridge portion 24) are formed as flat surfaces. The outer peripheral surface 15d of the first cutting edge portion 15 extends substantially perpendicular to the front and back surfaces of the first cutting edge portion 15. The outer peripheral surface 25d of the second cutting edge portion 25 extends substantially perpendicular to the front and back surfaces of the second cutting edge portion 25.

[0023] Here, because the blade line portions 15, 25 have a cantilever structure, if the first blade line portion 15 bends toward the second blade line portion 25 or the second blade line portion 25 bends toward the first blade line portion 15, there is a risk that the outer peripheral surface 15d of the first blade line portion 15 and the outer peripheral surface 25d of the second blade line portion 25 will get caught when closing the scissors 1. If this occurs, the scissors 1 will not be able to close smoothly. In this embodiment, to prevent this from happening, as shown in Figures 2(a) and 2(b), a first guide protrusion 17 and a second guide protrusion 27 are provided on the base side of the outer peripheral surfaces 15d, 25d of the blade line portions 15, 25, respectively, protruding in the direction opposite to the ridge portions 14, 24. The guide protrusions 17, 27 correspond to guide portions.

[0024] As shown in FIG. 3( b), the first guide protrusion 17 has a first inclined surface 17a that slopes from the back surface of the first cutting edge 15 toward the front surface as it approaches the tip. The second guide protrusion 27 has a second inclined surface 27a that slopes from the front surface of the second cutting edge 25 toward the back surface as it approaches the tip. The guide protrusions 17, 27 are generally triangular in cross section. In this embodiment, as shown in FIG. 3( c), when the scissors 1 are closed, when the first cutting edge 15 abuts against the second guide protrusion 27, the second guide protrusion 27 pushes the first cutting edge 15 toward the front surface, and when the second cutting edge 25 abuts against the first guide protrusion 17, the first guide protrusion 17 pushes the second cutting edge 25 toward the back surface. This prevents the first cutting edge 15 and the second cutting edge 25 from getting caught.

[0025] The intermediate portions 12, 22 are formed in a substantially circular shape when viewed from the front (see FIGS. 2(a) and 2(b)). Threaded holes 33, 34 through which a central screw 5 is inserted are formed in the centers of the intermediate portions 12, 22. As shown in FIGS. 4(a) and 4(b), the first intermediate portion 12 is formed with a spring accommodating chamber 35 that accommodates a coil spring 30. The coil spring 30 corresponds to an elastically deforming portion. Other springs (such as a leaf spring) may be used as the elastically deforming portion, or the scissors 1 may omit the coil spring 30. Note that the coil spring 30 is not shown in FIG. 4(a).

[0026] The spring accommodating chamber 35 is configured as an arc-shaped through-hole centered on the screw hole 33. The inner circumferential side of the spring accommodating chamber 35 is widened by providing a straight portion 35a to make it easier to insert the coil spring 30 from the outside. In the second intermediate portion 22, an arc-shaped through-hole 36 centered on the screw hole 34 is formed in an area that overlaps with the spring accommodating chamber 35 when the scissors 1 are in the closed state (see FIG. 2(b)). The circumferential length of the through-hole 36 is shorter than that of the spring accommodating chamber 35, and a protrusion 37 that is inserted into the spring accommodating chamber 35 is formed on the edge of the peak side of the through-hole 36. The protrusion 37 has a protruding length sufficient to be caught by the coil spring 30.

[0027] When the scissors 1 are closed, the protrusion 37 is inserted into the spring housing chamber 35. When the scissors 1 are opened from this state, the protrusion 37 moves in the spring housing chamber 35 from the cutting edge side of the first blade portion 11 toward the ridge side, compressing the coil spring 30 as it moves. When the scissors 1 are closed, the coil spring 30 biases the first blade portion 11 and the second blade portion 21 in the closing direction. Therefore, when the scissors 1 are left unattended or are not being used by anyone, the scissors 1 are in the closed state. Furthermore, the presence of the coil spring 30 and the protrusion 37 restricts the angle at which the scissors 1 can be opened.

[0028] Each of the first and second handle portions 13 and 23 has a ring-like shape with a finger hole formed therein. In a front view, the handle portions 13 and 23 have inner portions 13a and 23a that are close to each other when the scissors 1 are closed, and outer portions 13b and 23b that extend from one end of the inner portions 13a and 23a to the other end. Plate-like protrusions 19 and 29 that protrude toward the front are provided on the front sides of the inner portions 13a and 23a to prevent fingers from getting pinched between the inner portions 13a and 23a (see FIG. 2(b)). Furthermore, a hit point is provided on each side of the first and second inner portions 13a and 23a that face each other.

[0029] The pair of covers 6 are components attached to the intermediate portions 12, 22 by pin members 5. The pair of covers 6 is composed of a first cover 6 attached to the front side of the first intermediate portion 12 and a second cover 6 attached to the back side of the second intermediate portion 22. Each cover 6 has a screw hole 33, 34 through which a central screw 5 is inserted. Each cover 6 has an arc portion 6a having a substantially arc-shaped outer periphery in a front view and an extension portion 6b extending laterally from the arc portion 6a (see FIG. 2(c)). The extension portion 6b covers the gap X between the blade base side of the cutting edge portions 15, 25 and the intermediate portions 12, 22 from the outside. In addition, a protrusion 6c is formed on the back surface of each cover 6, which fits into a hole 38, 39 in each intermediate portion 12, 22. The protrusion 6c and the holes 38, 39 function as a rotation stopper for the cover 6.

[0030] Effects of the Embodiment In this embodiment, the blade lines 15, 25 of each of the first blade portion 11 and the second blade portion 21 have a cantilever structure in which only the cutting edge portions 31, 32 of both ends are supported, and further extend away from the ridges 14, 24, so that the blade lines 15, 25 are easily bent toward the ridges 14, 24. The pair of blade portions 11, 21 can cut soft materials such as paper, and if a finger is accidentally pinched between the pair of blade portions 11, 21 with strong force, the blade lines 15, 25 bend toward the ridges 14, 24 like a spring. This causes the angle between the blade lines 15, 25 to approach 0 degrees, and the bending of the blade lines 15, 25 makes it difficult for force to be transmitted to the finger, reducing the risk of injury to the finger. This effect is more pronounced toward the base of the blade lines 15, 25, which are more easily bent. In this embodiment, there is little risk of finger injury at the base of the blade, which is prone to injury with regular scissors. In particular, the pair of blades 11, 21 are made of hard resin, so the risk of injury is extremely low. This embodiment makes it possible to realize scissors 1 that can be used safely by small children and the like. It also prevents small children from cutting charging cables, curtains, etc., when using the scissors.

[0031] In addition, in this embodiment, the gap X between the base side of the blade line portions 15, 25 and the intermediate portions 12, 22 is covered from the outside by the cover 6, so that it is possible to prevent the blade line portions 15, 25 from being bent and broken due to an object getting caught on the base side of the blade line portions 15, 25.

[0032] In addition, in this embodiment, the coil spring 30 strongly biases the first blade 11 and the second blade 21 in the closing direction when the scissors 1 are closed, so that unless a child holds the scissors 1 correctly, the blades 11 and 21 cannot be opened, making it easier for children to learn how to hold the scissors correctly. Also, the scissors 1 will not be left in an open position.

[0033] Other Embodiments In the above-described embodiment, both the first blade portion 11 and the second blade portion 21 have a cantilever structure, but only one of them may have a cantilever structure.

[0034] In the above-described embodiment, finger holes are formed in the first handle portion 13 and the second handle portion 23, but finger holes do not necessarily have to be formed.

[0035] In the above-described embodiment, the cover 6 may be omitted, or the cover 6 may not cover the gap X described above.

[0036] The present invention is applicable to scissors that can be used safely by small children and the like.

[0037] REFERENCE SIGNS 1 Scissors 10 First body portion 11 First blade portion 12 First intermediate portion 13 First handle portion 14 First ridge portion 15 First cutting edge portion 20 Second body portion 21 Second blade portion 22 Second intermediate portion 23 Second handle portion 24 Second ridge portion 25 Second cutting edge portion 31 First cutting edge portion 32 Second cutting edge portion

Claims

1. A pair of scissors comprising a first main body having a first blade portion and a first handle portion, and a second main body having a second blade portion and a second handle portion, wherein the first blade portion and the second blade portion are configured to be openable and closable, the first blade portion having a first cutting edge portion, a first peak portion extending from the first cutting edge portion and supported at both ends, and a first blade line portion spaced from the first peak portion and extending from the first cutting edge portion toward the first handle portion side, and the first blade line portion is supported only on the first cutting edge portion side of both ends.

2. The second blade portion has a second cutting edge portion, a second peak portion extending from the second cutting edge portion and supported at both ends, and a second blade line portion spaced from the second peak portion and extending from the second cutting edge portion toward the second handle portion side, and the second blade line portion is supported only on the second cutting edge portion side of both ends. The pair of scissors according to claim 1.

3. On the blade base side of the first blade line portion, a guide portion is provided to move the second blade portion to the side opposite to the first blade portion when the second blade portion abuts to prevent the first blade portion and the second blade portion from being caught when closing the pair of scissors. The pair of scissors according to claim 1 or 2.

4. The first main body has a first intermediate portion provided between the first blade portion and the first handle portion, the second main body has a second intermediate portion provided between the second blade portion and the second handle portion, a pin member inserted through the first intermediate portion and the second intermediate portion to rotatably connect the first main body and the second main body, and a component attached to the first intermediate portion by the pin member, further comprising a cover that covers the gap between the blade base side of the first blade line portion and the first intermediate portion from the outside. The pair of scissors according to claim 1 or 2.

5. The pair of scissors according to claim 1 or 2, further comprising an elastically deformable portion that biases the first blade portion and the second blade portion toward the closing side in the closed state of the pair of scissors.

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