Clamping Device

Abstract

To provide a clamping device capable of fixing a round bar member and preventing it from shifting position or falling off during various subsequent operations. [Solution] The clamp device includes a fixed plate 3, a pressure plate 5, and a pressure member 4. The L-shaped member 1 has a fixed arm 1b extending from a handle 1a. The movable arm 2 has a mating hole 2a at the left end of the rod-shaped material into which the handle 1a is inserted, and a female screw hole 2b at its right end. The handle 1a is inserted into the mating hole 2a of the movable arm 2, and the movable arm 2 is movable relative to the handle 1a. A fixed plate 3 is joined to the tip of the fixed arm 1b, and a first V-shaped groove 3a is formed in its fixed clamp surface. The pressure member 4 has a male screw rod 4a that screws into the female screw hole 2b of the movable arm 2, and a pressure plate 5 supported at the lower end of the male screw rod 4a so that it can swing freely, and a second V-shaped groove 5a is formed in its pressure clamp surface.

Description

[Technical Field]

[0001] The present invention relates to a clamping device for fixing a round bar-shaped member. [Background technology]

[0002] 2. Description of the Related Art Conventionally, clamping devices are known that clamp an object member between a fixing plate and a pressure plate and fasten the object member to fix it.

[0003] Patent Document 1 describes a general clamping device that includes a fixed plate and a pressure plate. Patent Document 2 describes a clamping device that includes a fixed plate and a pressure plate, and has V-shaped grooves that intersect at right angles to each other in the fixed plate to make it suitable for clamping circular members. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Utility Model Application Publication No. 1-79564 [Patent Document 2] Japanese Patent Application Publication No. 10-309673 Summary of the Invention [Problem to be solved by the invention]

[0005] However, conventional clamping devices had a problem in that when a round bar-shaped member was fixed with the device and various operations were then performed (for example, transporting, rotating, cutting, inserting into other machines, etc.), the member was prone to shifting position or falling off. [Means for solving the problem]

[0006] In view of the above-mentioned problems, the present invention provides a clamping device for fixing a round bar-shaped member, comprising: The clamping device is characterized by comprising: a fixed plate having a fixed clamp surface with a first groove formed on the fixed clamp surface; a pressure plate arranged opposite the fixed plate and having a pressure clamp surface with a second groove formed on the pressure clamp surface; and a drive mechanism that moves the pressure plate toward the fixed plate and applies a pressure force to the pressure plate. [Effects of the Invention]

[0007] According to the clamping device of the present invention, grooves are formed on both the fixed clamping surface and the opposing pressure clamping surface, so that when the round rod-shaped member comes into contact with these grooves, it is possible to reliably prevent the member from shifting position or falling off. [Brief explanation of the drawings]

[0008] [Figure 1] 1A and 1B are plan and front views of a clamping device according to a first embodiment of the present invention; [Figure 2] FIG. [Figure 3] FIG. [Figure 4] FIG. 10 is a front view showing a state in which the rod-shaped member is fixed. [Figure 5] FIG. 10 is a side view showing a state in which the round bar-shaped member is fixed. [Figure 6] FIG. 10 is a front view showing the shapes of grooves formed in the fixing plate and the pressing plate. [Figure 7] 10A and 10B are plan and front views of a clamping device according to a second embodiment of the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0009] First Embodiment A clamping device 10 according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 6. explain.

[0010] Fig. 1(a) is a plan view of the clamp device 10, and Fig. 1(b) is a front view thereof. As shown in the figures, the L-shaped member 1 has a square rod-shaped handle 1a and a fixed arm 1b that extends to the right from the lower end of the handle 1a.

[0011] The moving arm 2 has a rectangular mating hole 2a at the left end of the rod-shaped material facing up and down, into which the handle 1a is inserted, and a female screw hole 2b facing parallel to the mating hole 2a is provided at the right end. By inserting the handle 1a into the mating hole 2a of the moving arm 2, the moving arm 2 can move up and down relative to the handle 1a.

[0012] An oval disk-shaped fixed plate 3 is joined to the tip of the fixed arm 1b by welding, etc. A V-shaped first groove 3a is formed in the fixed clamp surface of this fixed plate 3 by cutting.

[0013] The pressing member 4 (an example of a drive mechanism) includes a male screw rod 4a that screws into the female screw hole 2b of the moving arm 2, and a disk-shaped pressing plate 5 that is supported on the lower end side of the male screw rod 4a so as to be swingable.

[0014] A V-shaped second groove 5a is formed by cutting on the pressure clamp surface of this pressure plate 5, and this pressure clamp surface is arranged to face the fixed clamp surface of the fixed plate 3. In addition, a mating hole 4b is provided on the upper end side of the male screw rod 4a, and a turning rod 4c for turning the male screw rod 4a is inserted into this mating hole 4b.

[0015] As shown in Fig. 2, the first groove 3a extends in one direction from the front end (one end) of the fixed clamp surface of the fixed plate 3, through its center, to the rear end (the other end). Also, as shown in Fig. 3, the second groove 5a extends in one direction from the front end (one end) of the pressing clamp surface of the pressing plate 5, through its center, to the rear end (the other end).

[0016] Next, a method for fixing (clamping) the round bar member 6 using the clamp device 10 will be described.

[0017] First, move the moving arm 2 along the handle 1a of the L-shaped member 1, and adjust the distance between the fixed plate 3 and the pressure plate 5 so that the round bar member 6 is placed between the two plates 3, 5. Then, place the round bar member 6 on the fixed clamp surface of the fixed plate 3 along the first groove 3a.

[0018] Next, the pressure plate 5 is rotated (swiveled) to adjust the extension direction of the second groove 5a on the pressure clamp surface so that it coincides with the longitudinal direction of the round bar member 6. Then, the male screw rod 4a is rotated clockwise via the turning rod 4c to move the pressure plate 5 downward, thereby sandwiching the round bar member 6 between the pressure clamp surface and the fixed clamp surface, pressing and fixing it. To release the fixation of the round bar member 6, the male screw rod 4a is rotated counterclockwise via the turning rod 4c to move the pressure plate 5 upward, and the moving arm 2 is moved upward along the handle 1a of the L-shaped member 1.

[0019] Fig. 4 is a front view showing the state in which a round bar-shaped member 6 is fixed, Fig. 4(a) shows the case in which the diameter of the round bar-shaped member 6 is large, and Fig. 4(b) shows the case in which the diameter of the round bar-shaped member 6 is small. Fig. 5 is a side view corresponding to Fig. 4(a) showing the state in which a round bar-shaped member 6 with a large diameter is fixed.

[0020] According to the above-described clamping device 10, the upper and lower ends of the outer peripheral surface of the round bar member 6 come into contact with the second groove 5a on the pressure clamping surface and the first groove 3a on the fixed clamping surface (their wall surfaces or the corners at the boundaries between the clamping surface and the grooves), respectively, thereby reliably preventing misalignment in the left-right and front-back directions or falling off when various operations are performed after fixing (for example, operations such as transporting, rotating, cutting, inserting into other machines, etc.).

[0021] In this case, even if the diameter of the round bar member 6 varies to some extent as shown in FIGS. 4(a) and 4(b), the effect of preventing misalignment can be obtained. 6, the shape of the first groove 3a and the second groove 5a is not limited to (a) V-shape, but may also be (b) trapezoidal (groove bottom narrowing) or (c) arc-shaped. In the case of a V-shape, the angle θ between the inclined wall surfaces of the groove is preferably an obtuse angle of 110° to 130° to fully achieve the effect of preventing misalignment.

[0022] <Second embodiment> Next, a clamping device 20 according to a second embodiment of the present invention will be described with reference to FIG. Compared with the clamp device 10 of the first embodiment, the clamp device 20 has the following advantages: The moving arm 2 is not provided, and the pressure plate 14 is movable by a screw mechanism.

[0023] As shown in the figure, the C-shaped member 11 includes a handle 11a, a first fixed arm 11b extending rightward from the upper end of the handle 11a, and a second fixed arm 11c extending rightward from the lower end of the handle 11a. The right end of the first fixed arm 11b is provided with a vertically oriented female screw hole 11d.

[0024] A disk-shaped fixed plate 12 is joined to the tip of the second fixed arm 1c by welding, etc. A first V-shaped groove 12a is formed in the fixed clamp surface of this fixed plate 12.

[0025] The pressing member 13 (an example of a drive mechanism) includes a male screw rod 13a that screws into the female screw hole 11c of the first fixed arm 11, a disk-shaped pressing plate 14 that is supported at the lower end of the male screw rod 13a so that it can swing freely, and a gripping rod portion 13b at the upper end of the male screw rod 13a.

[0026] The gripping rod portion 13b may be provided with a fitting hole 13c for inserting a turning rod for rotating the male screw rod 13a. A second V-shaped groove 14a is formed in the pressure clamp surface of the pressure plate 14, and the pressure clamp surface is arranged to face the fixed clamp surface of the fixed plate 12.

[0027] Next, we will explain the method for fixing (clamping) the round bar member 6 using this clamp device 20. First, by rotating the gripping rod portion 13b, the pressure plate 14 is moved up and down, and the distance between the fixed plate 12 and the pressure plate 14 is adjusted so that the round bar member 6 is placed between them. After that, the round bar member 6 is placed on the fixed clamp surface of the fixed plate 12 along the first groove 12a.

[0028] Next, the pressure plate 14 is rotated (swung) to adjust the extension direction of the second groove 24a on the pressure clamp surface to coincide with the longitudinal direction of the round bar member 6. Then, the gripping rod portion 13b is rotated clockwise to move the pressure plate 14 downward, thereby sandwiching the round bar member 6 between the pressure clamp surface and the fixed clamp surface, pressing and fixing it. To release the fixation of the round bar member 6, the gripping rod portion 13c is rotated counterclockwise to move the pressure plate 14 upward.

[0029] According to the above-described clamping device 20, the upper and lower ends of the outer peripheral surface of the round bar member 6 come into contact with the second groove 14a on the pressure clamping surface and the first groove 12a on the fixed clamping surface (their wall surfaces or the corners at the boundaries between the clamping surface and the grooves), thereby reliably preventing misalignment in the left-right and front-back directions or falling off when various operations are performed after fixing (for example, operations such as transporting, rotating, cutting, and inserting into other machines).

[0030] In this case, similar to the clamp device 10 of the first embodiment, even if the diameter of the round bar member 6 varies to some extent, the effect of preventing misalignment can be obtained (see FIGS. 4 and 5).

[0031] Furthermore, the shapes of the first groove 12a and the second groove 14a are not limited to a V-shape, but may be trapezoidal or arc-shaped (see FIG. 6). In the case of a V-shape, the angle θ formed by the inclined wall surfaces of the groove is preferably an obtuse angle of 110° to 130° in order to fully obtain the effect of preventing misalignment. [Explanation of symbols]

[0032] 1 L-shaped member 1a Handle 1b Fixed arm 2 moving arms 2a mating hole 2b Female screw hole 3 Fixing Plate 3a First Groove 4 Pressing member 4a male screw rod 4b Engagement hole 4c Turning rod 5 Pressing plate 5a Second Groove 6 Round bar material 10 Clamping device 11 C-shaped member 11a Handle 11b First fixed arm 11c Second fixed arm 12 Fixing plate 12a First Groove 13 Pressing member 13a Male screw rod 13b Grip stick part 13c mating hole 14 Pressing plate 14a Second Groove 20 Clamping device

Claims

1. A clamping device for fixing a round bar-shaped member, a fixed plate having a fixed clamping surface with a first groove formed in the fixed clamping surface; a pressure plate disposed opposite the fixed plate, having a pressure clamp surface, with a second groove formed in the pressure clamp surface, and supported so as to be swingable; a drive mechanism that moves the pressure plate toward the fixed plate and applies a pressure force to the pressure plate.

2. 2. The clamping device according to claim 1, wherein the first groove extends in one direction from one end of the fixed clamping surface through a central portion of the fixed clamping surface to the other end, and the second groove extends in one direction from one end of the pressure clamping surface through a central portion of the pressure clamping surface to the other end.

3. 3. The clamping device according to claim 1, wherein the first and second grooves are V-shaped grooves.

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