scissors

Abstract

To provide anvil-type scissors with adjustable fitting to cutting blades. [Solution] Anvil-type scissors (1) have a cutting blade (2) on the upper blade side and a receiving tray (3) on the lower blade side. The receiving tray is composed of a roughly plate-shaped upper portion (3a) that receives the cutting blade and a lower portion (3b) that extends perpendicular to the upper portion. The lower portion and the lower blade side of the scissors have connecting holes (1a, 3c) at overlapping positions, and the upper portion is attached so that it can swing and be fixed by adjusting a screw (3d) that passes through the two holes. The upper portion has a downwardly convex central portion, and one or both of the two holes have a slight amount of play so that when the receiving tray swings, the bottom of the convex shape always contacts the upper surface of the lower blade side of the scissors. The upper portion is equipped with a means for positioning the upper portion with enough strength to prevent it from swinging when the screw is tightened. This configuration distributes the force applied to the receiving tray, allowing for thinner screws and thinner screw hole portions.

Description

[Technical Field]

[0001] The present invention relates to anvil-type scissors that have cutting blades on the upper blade side and a receiving tray portion (also called an anvil) on the lower blade side. [Background technology]

[0002] As disclosed in Patent Document 1, a conventional anvil-type scissors is known in which a tray portion is precisely positioned to fit the cutting blade, i.e., to fit snugly, and then secured by drilling a screw hole or the like (see scissors 200 in FIG. 7(a)). As shown in FIG. 7(b), the scissors 200 disclosed in Patent Document 1 include a tray portion 201 for receiving the cutting blade, which is generally plate-shaped with an upper surface that receives the cutting blade, and a tray portion 202 with rounded lower portions at both longitudinal ends and a flat bottom therebetween, and a support portion 203 that swingably receives the bottom of the tray portion 202 and has a notched portion that is shaped like an inverted isosceles trapezoid when viewed from the side. In this example, the support portion 203 corresponds to the side of the lower blade of the scissors 200. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 52-96500 Summary of the Invention [Problem to be solved by the invention]

[0004] In the case of scissors with the structure disclosed in Patent Document 1, both ends of the tray portion 202 slide along the two inclined surfaces of the inverted isosceles trapezoidal notch, moving from the state shown in FIG. 7(c) to the state shown in FIG. 7(d). Considering that anvil-type scissors are often used to cut plant branches or stems, strong force is applied to the central portion 202a of the tray portion 202. As shown in the figure, the central portion 202a is always floating. If strong force is applied to this central portion 202a, the force is concentrated on the screw 204 connecting the tray portion to its support portion, which may cause breakage. To ensure strength, it is necessary to thicken the screw 204 and the portions of the tray portion 202 and support portion 203 where the screw holes are located, which results in a problem of an increased weight for the scissors as a whole.

[0005] Anvil-type scissors are used to cut the branches or stems of plants, and as the market is relatively populated by elderly people, the balance between the durability and weight of the scissors is important.

[0006] The present invention has been made to solve the problems of the above-mentioned conventional examples, and aims to provide scissors that are durable and can be configured with screws having thinner shafts, and receptacles and supports with thinner screw hole portions than the conventional scissors. [Means for solving the problem]

[0007] In order to achieve the above object, the scissors of the present invention are anvil-type scissors with cutting blades on the upper blade side and a receiving tray on the lower blade side, the receiving tray being made up of an upper part in a substantially plate shape with an upper surface that receives the cutting blade, and a lower part that extends from an edge extending in the longitudinal direction of the upper part to the lower blade side in a direction perpendicular to the upper part, and the lower part and the lower blade side of the scissors have connecting holes at positions where they overlap, and the upper part can be swung and fixed in a direction along the longitudinal direction by adjusting screws that pass through the two holes. When viewed from the side, the thickness of the central part of the upper part is increased in a downward convex shape, and a slight amount of play is provided in one or both of the two holes with respect to the screw so that when the receiving part swings, the downward convex bottom can move while always in contact with the upper surface of the side of the lower blade of the scissors, and when the scissors are closed to align the cutting blades with the upper part and the screw is tightened while the upper part is in a swingable state, the upper part is provided with a means for positioning the upper part with enough strength to prevent it from swinging.

[0008] It is preferable that the hole provided in the lower part has a diameter larger than the value obtained by adding the diameter of the screw shaft to the height of the thread and does not have a thread groove, and that the screw hole in the lower blade side part has a thread groove that can be tightened with a screw, so that when the receiving tray part swings, it can be moved with its downwardly convex bottom always in contact with the upper surface of the lower blade side part of the scissors.

[0009] As a means for positioning the upper part with enough strength to prevent it from swinging when the screw is tightened, it is preferable that the upper part has two screw holes penetrating from the top to the bottom, one proximal and one distal, with the convex bottom between them when viewed from the handle of the scissors, and that each of the two screw holes has a small screw inserted therein that can adjust the distance from the top surface of the lower blade side of the scissors.

[0010] The cutting edge is preferably a straight edge. [Effects of the Invention]

[0011] According to the present invention, the receiving tray that receives the cutting blade can be repeatedly adjusted, and after adjustment, the scissors have a sturdy structure in which the force received by the cutting blade on the receiving tray is received not only by the screw but also by the upper surface of the lower blade side of the scissors.As a result, the force applied to the screw is reduced, and the scissors can be constructed with a screw having a relatively thin shaft, a receiving tray with a thin screw hole portion, and a lower blade side (support portion). [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a perspective view of anvil-type scissors according to one embodiment of the present invention; [Figure 2] FIG. 4 is an exploded perspective view showing the configuration of the tray portion of the scissors. [Figure 3] 10A to 10C are diagrams showing a procedure for adjusting the tray portion. [Figure 4] FIG. [Figure 5] 10A and 10B are diagrams illustrating the swinging movement of the tray, the resulting wobble of the screw hole, and the relationship between the screw hole and the screw taking the wobble into consideration. [Figure 6] 10A and 10B are diagrams illustrating the swinging movement of the tray, the resulting wobble of the screw hole, and the relationship between the screw hole and the screw taking the wobble into consideration. [Figure 7] Conventional scissors. DETAILED DESCRIPTION OF THE INVENTION

[0013] The scissors of the present invention are anvil-type scissors with cutting blades on the upper blade side and a tray on the lower blade side, the tray being composed of a generally plate-shaped upper portion having an upper surface that receives the cutting blade, and a lower portion extending from the longitudinal edge of the upper portion toward the lower blade side in a direction perpendicular to the upper portion. The lower portion and the lower blade side of the scissors have connecting holes at positions where they overlap, and the upper portion is attached so that it can swing and be fixed in place along the longitudinal direction by adjusting screws that pass through the two holes. When viewed from the side, the thickness of the central portion of the upper portion is convex toward the lower blade side, and one or both of the two holes has a slight play relative to the screw so that the convex bottom always contacts the upper surface of the lower blade side when the tray swings. The upper part is characterized by being provided with a means for positioning the upper part with enough strength to prevent it from swinging when the scissors are closed to align the cutting blades with the upper part and the screw is tightened while the upper part is swingable. By adopting the above configuration, the receiving tray that receives the cutting blade can be repeatedly adjusted, and after adjustment, the scissors have a sturdy structure in which the force received by the receiving tray from the cutting blade is received not only by the screw but also by the upper surface of the lower blade side of the scissors.As a result, the force applied to the screw is reduced, and compared to conventional scissors, the scissors can be configured with a screw with a thin shaft, a receiving tray and lower blade side with a thin screw hole portion.

[0014] With reference to the accompanying drawings, scissors 1 according to one embodiment of the present invention will be described. Figure 1 shows a perspective view of scissors 1. Scissors 1 are anvil-type scissors with a total length of approximately 210 mm, equipped with cutting blades 2 with straight edges (approximately 50 mm) on the upper blade side and a receiving tray 3 on the lower blade side, and used for pruning branches and stems, for example, by pushing the cutting blades against an object from above. For ease of explanation, this specification will refer to the direction of the blades of scissors 1 as the front, the side with the handle as the back, the direction of the upper blade side as the top, the direction of the lower blade side as the bottom, and the left and right directions as the sides.

[0015] 2 is an exploded perspective view showing the configuration of the tray 3 provided on the lower blade side. The tray 3 is composed of an upper portion 3a that is generally plate-shaped (short-side length (width in the left-right direction) approximately 8 mm, long-side length (length in the front-to-back direction) approximately 50 mm, and thickness (length in the up-to-down direction) approximately 5 mm) with an upper surface that receives the cutting blade 2, and a lower portion 3b that extends from the edge extending in the longitudinal direction of the upper portion 3a toward the lower blade in a direction perpendicular to the upper portion. The tray 3 is attached to the lower blade side portion 1a of the scissors 1 (simply referred to as lower blade side portion 1a).

[0016] The lower part 3b and the lower blade side part 1a of the scissors are provided with connecting holes 3c, 1b at a position where they overlap. The screw hole 3c is a hole without a thread groove, and its diameter is larger than the shaft diameter of the screw 3d plus the height of the thread. The screw hole 1b is a threaded hole for the screw 3d, and has a thread groove for the screw 3d on the inside. In other words, the screw hole 1b has the same or slightly larger diameter so that the shaft of the screw 3d can be inserted, and it has a thread groove that can be tightened by the screw 3d. By adjusting the screw 3d that passes through the two holes 3c, 1b, the upper part 3a can be attached in a fixed state or swayable along the longitudinal direction.

[0017] When viewed from the side (as viewed from the direction of arrow A), the thickness of the central portion of the upper portion 3a increases toward the lower blade, convex downward in this figure (see Figures 4, 5, and 6). A slight amount of play is provided in the screw hole 3c relative to the screw 3d so that the bottom of the convex shape can always be in contact with the upper surface 1c of the lower blade side portion 1a of the scissors when the receptacle portion 3 swings. This "slight play" means that the diameter of the screw hole 3c is slightly larger than the axial diameter of the screw 3d plus the height of the thread, so that the receptacle portion 3 can swing. The required size of the "slight play" of the screw hole 3c, the shape of the upper portion 3a as viewed from the side, and its operation will be explained in detail later with reference to Figures 5 and 6.

[0018] 3 is a diagram illustrating the procedure for fixing the upper part 3a. When manufacturing the scissors 1 or readjusting the tray part 3, the screw 3d is loosened so that the upper part 3a can swing (hereinafter referred to as STEP 1).

[0019] Next, the scissors 1 are closed to fit the cutting blades 2 and the upper portion 3a together perfectly; in this embodiment, the cutting blades 2 are straight, and the upper portion 3a is fitted to this blade without any gaps (hereinafter referred to as STEP 2). During manufacturing, the scissors 1 are closed firmly by an assembly machine with a force that does not dull the tip of the cutting blades 2. When the user readjusts the scissors 1, they are closed with the grip strength of an average adult.

[0020] Next, the position of the tray portion 3 is temporarily determined using the machine screws 3e and 3f (hereinafter referred to as STEP 3).

[0021] The upper part 3a has two screw holes 3g, 3h for machine screws that penetrate from the top to the bottom, located at two positions, proximal and peripheral, as viewed from the handle of the scissors, with the downwardly convex bottom between them. Machine screws 3e, 3f are inserted into these two screw holes and tightened so that their lower ends contact the upper surface 1c of the lower blade side part 1a (see Figure 2). Machine screws 3e, 3f function as a means for positioning the upper part 3a with enough strength to prevent it from swinging when screw 3d is tightened. Furthermore, finer height adjustments are possible depending on the fineness of the thread pitch of the machine screws 3e, 3f. Figure 4 shows how the tray 3 is fixed by the machine screws 3e and 3f. The shape of the lower blade side 1a of the scissors 1 is exactly as shown in Figures 2 and 3, but in this figure, for ease of explanation, it is shown as a rectangle to emphasize the shape of the bottom that is convex toward the lower blade side of the tray 3 and the position of the screw hole 3c. As shown in the figure, the machine screws 3e and 3f pass through the screw holes 3g and 3h in the upper part 3a of the tray 3, and their lower ends abut against the upper surface 1c of the lower blade side 1a. In this state, screw 3d is tightly tightened to fix tray 3. When screw 3d is tightened, the frictional force causes tray 3 to rotate in the direction of tightening the screw, but machine screws 3e and 3f act to prevent this movement (hereinafter referred to as STEP 4). The function of temporarily determining the position of the tray portion 3 using the machine screws 3e, 3f is more effective when the scissors 1 are readjusted by the user than when the scissors 1 are manufactured.

[0022] By performing the above steps 1 to 4, the tray 3 can be fixed at an angle that best fits the cutting blade 2. In anvil-type scissors, the cutting blade 2 and tray 3 fit together perfectly. In the case of straight cutting blades as in this embodiment, it is essential for sharpness that the tray 3 fit perfectly with the upper part 3a of the tray. For example, if the cutting blade 2 is resharpened, or if the cutting blade 2 is slightly misaligned due to manufacturing errors, by performing the above steps, the tray 3 can be fixed so that it best fits the cutting blade 2, making it possible to maintain excellent sharpness.

[0023] The tray 3 can be adjusted to a position that best fits the cutting blade 2, and when cutting hard branches or stems, the force applied to the center of the tray 3 is received and distributed not only by the screw 3d but also by the upper surface 1c of the lower blade side 1a. By adopting this configuration, compared to the conventional scissors shown in Figure 7, where force is applied "only" to the center of the tray 202, the diameter of the screw 3d can be made smaller and the thickness of the screw hole (i.e., the thickness of the lower portion 3b of the tray 3 and the thickness of the lower blade side 1a) can be made thinner while maintaining the same strength, resulting in a lightweight pair of scissors.

[0024] Figures 5 and 6 show the swinging movement of the tray 3a and the resulting displacement of the screw hole 3c. The shape of the lower blade side 1a of the scissors 1 is accurately depicted in Figures 2 and 3. However, for ease of explanation, Figures 5 and 6 depict the shape of the tray 3 as a rectangle to emphasize the swinging movement of the tray 3 and the resulting movement of the screw hole 3c. When viewed from the side (front view in the figure), the upper portion 3a of the tray 3 is thicker in the center toward the lower blade, convex downward in the figure; specifically, it has a V-shaped convex shape. In Figure 5, the dotted lines indicate the movement of the screw hole 3c when the tray 3 swings while the bottom of the downward convex shape (position P1) is fixed and always in contact with the upper surface 1c of the lower blade side 1a of the scissors. As shown in the figure, the screw hole 3c moves left and right more depending on the diameter from the P1 position to the screw hole 3c, and the narrower the V-shaped opening is from 180 degrees. The opening of this V-shape determines the range of swing of the receiving tray portion 3 and is determined based on the expected amount of variation in the upper cutting edge 2. For example, the opening of the V-shape is set to an angle smaller than 180 degrees but larger than 170 degrees. Taking the above-mentioned wobble into consideration, in the embodiment shown in Figure 5, the screw hole 3c is sized to a diameter that includes the wobble depicted by the dotted line on the right side of Figure 5. Note that this does not mean that the screw hole 3c is moved to the right side of Figure 5.

[0025] In FIG. 6, when the tray portion 3 swings, when the position of the screw hole 3c is not shifted left and right, but the downward convex bottom (P2 position) is slightly shifted left and right downward to move the screw hole 3c up and down, the movement of the hole 3c is depicted by a dotted line. If the distance from the P2 position when the upper surface of the tray portion 3 is horizontal to the center of the screw hole 3c is L, and the included angle with respect to the screw hole 3c when the P2 position is shifted left and right is θ, the distance L1 from the upper surface of the tray portion 3 to the center of the screw hole 3c is expressed as L1 = L×cosθ. For example, θ is greater than 0 degrees and less than 10 degrees. The fact that it becomes the distance from L to L1 (<L) means that the center of the screw hole 3c moves upward from P3 to P4. Note that the amount of deviation is small compared to the left and right deviations shown in FIG. 5. Considering the above deviation, in the embodiment shown in FIG. 6, the screw hole 3c is sized to a diameter that includes the deviation depicted by a dotted line as drawn on the right side in FIG. 6. Note that it does not mean that the screw hole 3c is moved to the right side in FIG. 6.

[0026] The shape of the screw hole 3c is not a perfect circle, and it is also possible to make it the outer edge shape (elongated hole shape) of the movement locus of the screw hole 3c. Also in this case, it is included in the definition of a screw hole with a "slight play" compared to the screw hole for the screw 3d.

[0027] As described in FIGS. 5 and 6, in the present embodiment, the tray portion 3 is fastened to the lower blade side portion 1a of the scissors with the screw 3d passing through the screw hole 3c without a screw groove and the screw hole 1b with a screw groove. When using a nut for the screw 3d, the screw hole 1b is also a hole with a diameter obtained by adding the height of the thread to the shaft diameter of the screw 3d, and is configured to have no screw groove inside. In this case, if play is provided in the screw hole 1b as well, the amount of play for each can be made smaller compared to the case where play is provided only in the screw hole 3c. In this sense, a slight play can be provided in one or both of the two holes 3c and 1b and used.

[0028] The present invention is not limited to the configuration of the embodiment, and various modifications are possible without departing from the spirit of the invention. For example, while the cutting blade 2 has a straight cutting edge, a curved cutting edge can also be used without any problems by adjusting the upper side of the tray 3 to a curved shape that fits the cutting blade 2. Even in this case, the tray 3 can be adjusted to a position that best fits the cutting blade 2, and the force applied to the tray 3 is distributed and supported not only by the screw 3d but also by the upper surface 1c of the lower blade side portion 1a. This allows the diameter of the screw 3d to be smaller while maintaining the same strength as the conventional scissors shown in Figure 7, and the thickness of the screw hole portion, i.e., the thickness of the lower portion 3b and the thickness of the lower blade side portion 1a, can be reduced, resulting in a lighter weight of the scissors.

[0029] The shape of the bottom of the tray portion 3 is not limited to a V-shape as in this embodiment, and a U-shape with a large radius of curvature can also provide the same effect.

[0030] By making the thread pitch of the small screws 3e and 3f finer, not only can the height be finely adjusted, but they can also be used like a "jack," and the inclination of the tray part 3 can be adjusted without loosening the tray part 3 with the screw 3d or without loosening it too much.

[0031] Furthermore, instead of the small screws 3e and 3f, it is also possible to use a "wedge"-like member inserted between the bottom of the tray 3 and the upper surface 1c of the lower blade side portion 1a as a means of positioning the upper portion 3a of the tray 3 with enough strength to prevent it from swinging, or as a means of temporarily determining the position.

[0032] Furthermore, the number of machine screws provided on the tray 3 is not limited to two, and may be, for example, four. For example, if two screws are provided in the short direction of the tray 3, for a total of four, it becomes possible to adjust the inclination of the short direction of the upper surface of the tray 3 so that it is perpendicular to the cutting edge 2. [Industrial Applicability]

[0033] Although the scissors of the present invention are shown in the embodiment as being used with one hand, the present invention can also be applied to pruning scissors with long handles (for example, about 300 mm long). [Explanation of symbols]

[0034] 1,200 scissors 1a Lower blade side 1b Screw hole on the side of the lower blade 1c Upper surface of the side of the lower blade 2 cutting edges 3. Receptacle 3a Upper part 3b Lower part 3c Screw hole in the tray 3d screw 3e, 3f machine screws 3g, 3h Screw holes for small screws

Claims

1. In anvil-type scissors, the upper blade side of the scissors is provided with a cutting blade and the lower blade side is provided with a receiving tray. the tray portion is composed of a generally plate-shaped upper portion having an upper surface that receives the cutting blade, and a lower portion that extends from an edge extending in the longitudinal direction of the upper portion toward the lower blade in a direction perpendicular to the upper portion, The lower part and the lower blade side of the scissors are provided with connecting holes at positions where they overlap, and the upper part is attached so as to be swingable and fixed in a longitudinal direction by adjusting the screws passing through the two holes; When viewed from the side, the thickness of the central part of the upper part is thicker in a convex shape toward the lower blade side, and a small amount of play is provided in one or both of the two holes relative to the screw so that when the receiving tray part swings, the convex bottom can move while always in contact with the upper surface of the side of the lower blade of the scissors, The scissors are characterized in that the upper part is provided with a means for positioning the upper part with enough strength to prevent it from swinging when the scissors are closed to align the cutting blades with the upper part and the screw is tightened while the upper part is in a swingable state.

2. The scissors according to claim 1, The holes in the lower part have a diameter larger than the diameter of the screw shaft plus the height of the threads, and do not have a thread groove, and the screw holes in the lower blade side have a thread groove that can be tightened with a screw, so that when the receiving tray swings, it can be moved with its downwardly convex bottom always in contact with the upper surface of the lower blade side of the scissors.

3. In the scissors according to claim 1 or 2, As a means for positioning the upper part with enough strength to prevent it from swinging when the screws are tightened, the upper part has two screw holes that penetrate from the top to the bottom, at two locations, proximal and distal, with a convex bottom between them when viewed from the handle of the scissors, and furthermore, small screws are inserted into each of the two screw holes to adjust the distance from the top surface of the lower blade side of the scissors.

4. The scissors according to claim 3, The scissors are characterized in that the cutting blades are straight blades.

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