Hand-held pinching tool

Abstract

To provide a hand-held pinching tool capable of pinching a heavy object even with a small force without allowing the object to rotate when pinching the object.SOLUTION: A hand-held pinching tool includes: a pair of pinching bars 1 pinching an object O; two pinching surfaces 1b facing each other to pinch the object O at one end portion 1a of the pinching bars 1; and three gripping portions 2 respectively provided on the two pinching surfaces 1b and coming into contact with the object O. Therein the three gripping portions 2 are provided on the pinching surfaces 1b so as to form a triangle when contact vertices 2b coming into point contact with the object O are connected.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a handheld clamp. [Background technology]

[0002] Normally, when holding an object, it is necessary to have a certain amount of friction with the object and to pinch the object by grasping the object's center of gravity. If the object is pinched without a certain amount of friction, it will slip and will not be possible to hold it. Also, even if there is a certain amount of friction, if the object is pinched without grasping the object's center of gravity, the contact point will become the axis, a rotational moment will be generated, and the object will rotate, making it difficult to hold.

[0003] Therefore, in order to overcome the above-mentioned problems, Patent Document 1 describes that by providing a convex portion near the gripping portion, the gripping portion and the convex portion grip the object at four points, thereby preventing rotation of the object. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2023-000026 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the tongs described in Patent Document 1, the convex portion protrudes inward from the gripping portion, which may result in two-point support for the object. As a result, the convex portion may function as a rotation axis, causing the object to rotate. In particular, when gripping a heavy object, it is necessary to apply force to hold the object without rotating it.

[0006] Therefore, the present invention has been made in consideration of the above circumstances, and provides a handheld clamping tool that can clamp a heavy object with little force without causing the object to rotate when clamping it. [Means for solving the problem]

[0007] In view of the above problems, the handheld clamping tool of the present invention has a pair of clamping bars for clamping an object, two opposing clamping surfaces at one end of the clamping bars for clamping the object, and three gripping parts provided on each of the two clamping surfaces for contacting the object, and the three gripping parts are provided on the clamping surfaces so that when the contact vertices that make point contact with the object are connected, they form a triangle.

[0008] The gripping portion is characterized by being a cone-shaped gripping portion.

[0009] Another feature of the present invention is that the three cone-shaped holding portions are provided with contact generatrixes that make line contact with the object, among the generatrixes of the cone-shaped holding portions, and are arranged on the clamping surface so that the contact generatrixes are directed toward one point.

[0010] Another feature of the present invention is that the three cone-shaped holding portions have contact sides that come into surface contact with the object, and the orientation of the cone-shaped holding portions is such that the cone-shaped holding portions are provided on the clamping surface so that each of the contact sides faces the object. [Effects of the Invention]

[0011] The handheld clamping tool of the present invention has three gripping portions at one end of the clamping bar that face the clamping surface of the clamping bar that clamps the object and the clamping surface of the other clamping bar, which come into contact with the object, and the three gripping portions are arranged on the clamping surface so that the contact vertices that come into contact with the object form an approximately triangle, so the object can be clamped with little force without having to grasp the center of gravity of the object and without it rotating.

[0012] Furthermore, by using a cone-shaped gripping portion as the gripping portion, the generatrix or side of the cone can be brought into contact with the object, thereby clamping the object.

[0013] Furthermore, the three cone-shaped gripping portions are provided on the clamping surface so that the contact generatrix of the cone-shaped gripping portions makes line contact with the object, so that the object can be clamped even through line contact.

[0014] Furthermore, the three cone-shaped gripping portions are provided on the clamping surface so that the contact side surfaces of the cone-shaped gripping portions come into surface contact with the object, and therefore the object can be clamped even through surface contact. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a schematic perspective view of a handheld clamping tool according to a first embodiment. [Figure 2] 1A is a schematic plan view of the clamping surface of one clamping bar of the hand-held clamping tool according to the first embodiment, and FIG. 1B is a schematic plan view of the clamping surface of the other clamping bar. [Figure 3] 1A is a schematic plan view of the clamping surface of one clamping bar whose central vertices are spaced apart, and FIG. 1B is a schematic plan view of the clamping surface of the other clamping bar whose central vertices are spaced apart. [Figure 4] 1A is a schematic diagram illustrating a first example of the hand-held clamping tool according to the first embodiment in use, and FIG. 1B is a schematic diagram illustrating a second example of the hand-held clamping tool according to the first embodiment in use. [Figure 5] 10A is a schematic plan view of the clamping surface of one clamping bar of a handheld clamping tool according to a second embodiment, and FIG. 10B is a schematic plan view of the clamping surface of the other clamping bar. [Figure 6] (a) is a schematic plan view of the clamping surface of one clamping bar in which three cone-shaped gripping portions 2a are provided at intervals, and (b) is a schematic plan view of the clamping surface of the other clamping bar in which three cone-shaped gripping portions 2a are provided at intervals. DETAILED DESCRIPTION OF THE INVENTION

[0016] The handheld clamping device 100, 200 according to the present invention is a tool that can be held by a user in one hand and that can clamp and hold an object O. The handheld clamping device 100, 200 mainly has a pair of clamping bars 1, two clamping surfaces 1b at one end 1a of the clamping bars 1 that face each other so as to clamp the object O, and three gripping portions 2 provided on each of the two clamping surfaces 1b that come into contact with the object O, and has a simple structure overall.

[0017] [First embodiment] A handheld clamping tool 100 according to a first embodiment will be described.

[0018] (Regarding clamp rod 1) The clamping rods 1 are a pair of rods, and a gripping portion 2 is provided at one end 1a that clamps the object O. As shown in FIG. 1, the clamping rods 1 in the handheld clamping tool 100 are plate-shaped, but the shape is not particularly limited, and they may be cylindrical or tapered as long as they have a longitudinal axis and can be held by the user's hand.

[0019] Furthermore, the clamping bars 1 are provided with one or more fulcrums 3 at any point on the line of the clamping bars 1, connecting the clamping bars 1 and allowing the clamping bars 1 to open and close freely. In the case of the handheld clamping device 100 according to the first embodiment, the fulcrum 3 is provided at the other end 1c of the clamping bars 1. By gripping the clamping bars 1 near the middle, the user can rotate the clamping bars 1 around the other end 1c as the fulcrum 3 and clamp the object O. When the fulcrum 3 is provided at the other end 1c, the clamping bars 1 are formed so that a force acts outward on the clamping bars 1. The fulcrum 3 may be formed at a bent portion 4 formed by bending a single continuous rod. The fulcrum 3 may not be provided at the other end 1c, but may be provided at an intermediate portion 5, or may be provided at multiple locations.

[0020] Alternatively, the fulcrum 3 may be a hinge. When the fulcrum 3 is a hinge, the clamping bars 1 may be connected to each other by an elastic body such as a spring so that a force acts in the direction in which the clamping bars 1 open when clamping is attempted.

[0021] Furthermore, the size of the clamping bar 1 may be reduced without providing the fulcrum 3, and the clamping bar 1 may be used as chopsticks. In this case, the hand can be used as the fulcrum 3.

[0022] 1, there is an inflection point 6 where the angle of a part of the clamping rod 1 changes. At the inflection point 6, the clamping rod 1 bends to the side that clamps the object O, and the angle of the clamping rod 1 is adjusted so that when the clamping rod 1 clamps the object O, one gripping portion 2 and the other gripping portion 2 face each other and the gripping portion 2 is perpendicular to the surface of the object O.

[0023] (Regarding the grip part 2) As described above, the gripping portions 2 are provided on the clamping surfaces 1b of the pair of clamping bars 1 to come into contact with the object O. When the gripping portions 2 clamp the object O, the contact vertices 2b at their tips come into point contact with the object O. Furthermore, three gripping portions 2 are provided for one clamping surface 1b, and as shown in FIG. 2(a), they are arranged so that connecting the contact vertices 2b forms a triangle. Of the triangles, an acute triangle is preferable, and in this embodiment, the gripping portions 2 are arranged on the clamping surfaces 1b so that connecting the contact vertices 2b forms an equilateral triangle.

[0024] (Regarding the cone-shaped holding portion 2a) In this embodiment, the shape of the gripping portion 2 is a cone. As shown in FIG. 2 and other figures, the gripping portion 2 of the handheld clamping tool 100 is a cone-shaped gripping portion 2a that is a regular tetrahedron of a triangular pyramid, which is a polygonal pyramid. Three cone-shaped gripping portions 2a are fixed to the clamping surface 1b of one clamping bar 1, and the contact apexes 2b of the cone-shaped gripping portions 2a are fixed so as to face the clamping surface 1b of the other clamping bar 1. Similarly, another cone-shaped gripping portion 2a is fixed to the clamping surface 1b of the other clamping bar 1, and the contact apexes 2b of the cone-shaped gripping portions 2a are fixed so as to face the clamping surface 1b of the one clamping bar 1. The cone-shaped gripping portions 2a and the clamping surface 1b can be fixed by adhesive, soldering, welding, or the like, and the fixing method is not particularly limited.

[0025] As shown in Figures 2(a) and 2(b) and 4(b), the three cone-shaped holding portions 2a have contact generatrix 2c among the generatrix of the cone-shaped holding portion 2a, which make line contact with the object O. The orientation of the cone-shaped holding portions 2a provided on the clamping surface 1b is adjusted so that the contact generatrix 2c are directed toward a single point 7.

[0026] In this embodiment, the three cone-shaped gripping portions 2a are arranged so that the central vertices 2d, which are vertices located on the clamping surface 1b and at the ends of the contact generatrix 2c, are in contact with each other. However, the central vertices 2d do not have to be in contact with each other; instead, as shown in FIGS. 3(a) and 3(b), the central vertices 2d may be arranged spaced apart. In this case, each central vertex 2d may be arranged anywhere on the circumference of a circle R that passes through the three central vertices 2d. Furthermore, although the cone-shaped gripping portions 2a are arranged on the circumference of the circle R so as to be equally spaced, they do not have to be equally spaced. The center C of the circle R and the point 7 coincide with each other.

[0027] Since the shape of the cone-shaped gripping portions 2a is a regular tetrahedron, as shown in Fig. 4(a), the rising angle α of the contact generatrix 2c rising from the clamping surface 1b can be changed as appropriate to match the shape of the target object O. Furthermore, the rising angle α of all the cone-shaped gripping portions 2a does not have to be the same, and each may be a different angle.

[0028] By arranging the cone-shaped holding portions 2a so that the figure connecting each contact vertex 2b forms a triangle, when the outer shape of the object O that contacts the cone-shaped holding portions 2a is flat or a curved surface passing through three contact vertices 2b, when the object O is clamped, the number of contact vertices 2b that contact the object O per clamping rod 1 will be three.

[0029] Therefore, by positioning the gripping unit 2 so that the contact vertices 2b come into contact with at least one side of the object O at three points and connecting these three points to form an equilateral triangle, and by pressing the object O from the opposite side as well, the object O becomes less likely to rotate even when clamped at the end of the object O. Furthermore, by contacting the contact vertices 2b at three points from the opposite side as well, i.e., by clamping the object O at six points, the object O is further fixed and will not rotate.

[0030] The distance between adjacent gripping portions 2 can be adjusted as appropriate depending on the size of the object O. When clamping a large object O, it is preferable to increase the distance between adjacent gripping portions 2, and conversely, when clamping a small object O, it is preferable to decrease the distance between adjacent gripping portions 2. Similarly, the size of all three gripping portions 2 is the same and can be adjusted as appropriate depending on the size of the object O. When clamping a large object O, it is preferable to increase the size of the gripping portions 2, and conversely, when clamping a small object O, it is preferable to decrease the size of the gripping portions 2.

[0031] Increasing the number of gripping portions 2 to, for example, 16 makes it difficult to bring all 16 contact vertices 2b into contact with the object O because the shape of the gripping portions 2 itself does not change. In the case of cone-shaped gripping portions 2a, arranging the 16 cone-shaped gripping portions 2a so that they are evenly spaced toward a single point 7 can result in an arrangement that is roughly circular. In this case, if only four of the 16 contact vertices 2b are able to make contact, connecting the contact vertices 2b that actually contact the object O forms a figure that can be approximated as a straight line rather than a triangle. If the figure formed by connecting the contact vertices 2b approximates a straight line, the object O is more likely to rotate around the contact point, so the gripping rod 1 must be gripped tightly to increase friction. Therefore, by limiting the number of contact vertices 2b to a minimum of three, all contact vertices 2b can reliably contact the object O. As a result, connecting the contact points forms a triangle, preventing the object O from rotating and allowing the object O to be clamped with minimal force.

[0032] Furthermore, the gripping portions 2 are arranged offset so that the contact vertices 2b of one gripping portion 2 and the other gripping portion 2 do not interfere with each other when the pair of clamping bars 1 are closed. In this embodiment, as shown in Figures 2(a) and 2(b), one contact vertex 2b is arranged so that one of the contact vertices 2b is located between two of the other contact vertices 2b. By arranging one contact vertex 2b to engage with the valley of the other contact vertex 2b, the force applied by the cone-shaped gripping portion 2a to the object O when clamped is dispersed rather than concentrated, thereby reducing the burden on the object O.

[0033] 4(b), even if the object O has a shape that does not pass through the contact apex 2b when attempting to clamp the object O, the cone-shaped gripping portion 2a can make contact with the object O at the contact generatrix 2c and clamp the object O. For example, if the object O is too small to be contacted at a point, the object O can be clamped by line contact with the contact generatrix 2c.

[0034] Of course, it is possible to hold the object O not only by point contact or line contact, but also by point contact and line contact. By having the gripping portion 2 make point contact and / or line contact with the object O, it is possible to hold objects O of various shapes.

[0035] (About the Examples) As shown in Figure 4(a), when the object O is a long body, it is preferable to clamp the object O near the center, which is the position of the center of gravity of the object O. However, if it is not possible to clamp the object O near the position of the center of gravity and it is necessary to clamp the end of the object O, the user grasps the clamping rods 1 and clamps the object O so that the contact vertices 2b are in contact with the object O. Even at the end of the object O, by contacting one side of the object O with the contact vertices 2b so as to form a triangle, the contact vertex 2b serves as a fulcrum to prevent the object O from rotating. Furthermore, the back side is also contacted with the contact vertices 2b so as to form a triangle, so that there are contacts at a total of six contact vertices 2b, and the object O can be stably clamped without rotating.

[0036] As shown in FIG. 4(b), when an object O is small enough that its shape does not pass through the three contact vertices 2b, attempting to grip it with a handheld clamping tool with a flat gripping portion like ordinary tongs results in point contact with the object O, which can cause the object O to slip and fall, or the object O to shift from its center of gravity, resulting in poor gripping. The handheld clamping tool 100 allows contact with the object O at three points using one of the three contact generatrixes 2c, and the object O can be contained within the space formed by the three contact generatrixes 2c. By containing the object O within this space, it will not slip out of place. Furthermore, by clamping the object O from the other clamping rod 1 and supporting it from the other three contact generatrixes 2c, the object O can be clamped at a total of six contact generatrixes 2c, allowing for stable gripping of a small object O.

[0037] [Regarding the second embodiment] Next, a handheld clamping tool 200 according to a second embodiment will be described.

[0038] The handheld clamping tool 200 according to the second embodiment differs from the handheld clamping tool 100 according to the first embodiment in the orientation of the cone-holding portion 2a. The structure of the clamping bar 1 and the cone-holding portion 2a itself is the same as that of the handheld clamping tool 100 according to the first embodiment.

[0039] (Regarding the cone-shaped holding portion 2a) As shown in Figures 5(a) and 5(b), the three cone-shaped holding portions 2a each have a contact side surface 2e that comes into surface contact with the object O. The cone-shaped holding portions 2a are provided on the clamping surface 1b so that each contact side surface 2e faces the object O. The contact side surfaces 2e are adjacent to each other to surround the object O.

[0040] Furthermore, in this embodiment, the three cone-holding portions 2a are provided adjacent to each other and are provided to form the smallest circle R. As shown in FIGS. 6(a) and 6(b), the three cone-holding portions 2a do not have to be adjacent to each other, and the three cone-holding portions 2a may be provided with a gap between them. In this case, the three cone-holding portions 2a may be provided anywhere on the circumference of the circle R formed with the three bases 2f as tangents. Furthermore, the cone-holding portions 2a do not have to be provided on the circumference of the circle R so as to be equally spaced apart.

[0041] Because the shape of the cone-shaped gripping portions 2a is a regular tetrahedron, the rising angle α of the contact side surfaces 2e rising from the clamping surface 1b can be changed as appropriate to match the shape of the object O. Furthermore, the rising angle α of the contact side surfaces 2e of all of the cone-shaped gripping portions 2a does not have to be the same, and each may be a different angle.

[0042] When using the handheld clamping tool 200, if the object O is fragile or soft, the contact side surface 2e makes surface contact with the object O, increasing the contact area with the object O, thereby dispersing pressure and enabling the object O to be clamped safely.

[0043] Furthermore, similarly to the handheld clamping tool 100 according to the first embodiment, the object O can be clamped by making point contact and / or surface contact with the object O using the three contact vertices 2b.

[0044] [Other embodiments] In other embodiments, as shown in the first and second embodiments, three cone-shaped holding portions 2a have contact generatrix 2c or contact side surfaces 2e for one clamping rod 1. However, the orientation of the cone-shaped holding portions 2a may be adjusted so that one of the three cone-shaped holding portions 2a has the contact generatrix 2c and the remaining two have the contact side surfaces 2e. Furthermore, the orientation of the cone-shaped holding portions 2a may be adjusted so that two of the three cone-shaped holding portions 2a have the contact generatrix 2c and the remaining one has the contact side surface 2e. The cone-shaped holding portions 2a may be configured to be rotatable so that their orientation can be adjusted as needed. Furthermore, a member with a high friction coefficient, such as rubber, may be attached to the contact vertex 2b or contact generatrix 2c, or the surface may be made uneven to increase friction.

[0045] Furthermore, in the first and second embodiments, the grip portion 2 has a cone shape, but it does not have to be a cone shape as long as it has a contact apex and a contact generatrix.

[0046] Furthermore, in the first and second embodiments, the cone-shaped gripping portion 2a has a triangular pyramid shape, but it may also have a polygonal pyramid or a cone. When the gripping portion 2 has a polygonal pyramid shape, such as a hexagonal or heptagonal pyramid, the number of contact generatrixes 2c and contact side surfaces 2e increases, making it possible to clamp the object O with multiple contact generatrixes 2c and / or contact side surfaces 2e. Furthermore, when the gripping portion 2 has a conical shape, the outer shape of the gripping portion 2 is curved, so when it comes into contact with the planar object O, it becomes a line contact, and no matter where it comes into contact, it can be made to contact as a contact generatrix 2c.

[0047] In addition, in the first and second embodiments, three gripping portions 2 were arranged on one clamping surface 1b to form one triangle, but as long as all of them can come into contact with the object O, six gripping portions 2 may be arranged to form two triangles, or nine gripping portions 2 may be arranged to form three triangles, and the number can be designed to be optimal for the shape of the object O. [Explanation of symbols]

[0048] 100 handheld holder 200 handheld holder 1. Holding baton 1a One end 1b Hostage situation 1c Other end 2. Control Department 2a Cone holding part 2b Contact vertex 2c Contact busbar 2d center vertex 2e Contact side 2f bottom 3 fulcrums 4. Folded section 5 middle part 6 bending point 7. One point O object R yen C Center α vertical angle

Claims

1. A pair of clamping bars that clamp the object; two opposing clamping surfaces at one end of the clamping rod for clamping the object; three gripping portions that come into contact with the object and are provided on the two clamping surfaces, respectively; A handheld clamping tool characterized in that the three gripping parts are arranged on the clamping surface so that when the contact vertices that make point contact with the object are connected, they form a triangle.

2. 2. The handheld clamping tool according to claim 1, wherein the gripping portion is a cone-shaped gripping portion.

3. 3. The handheld clamping tool according to claim 2, wherein the three cone-shaped gripping portions have contact generatrixes among the generatrixes of the cone-shaped gripping portions that make line contact with the object, and the cone-shaped gripping portions are provided on the clamping surface so that the contact generatrixes are directed toward one point.

4. The handheld clamping tool according to claim 2, characterized in that the three cone-shaped gripping portions have contact sides that come into surface contact with the object among the sides of the cone-shaped gripping portions, and the cone-shaped gripping portions are provided on the clamping surface so that each of the contact sides faces toward the object.

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