JP5739933B2 - Clamping device - Google Patents

Description

  The present invention relates to a clamp device used for assembling a temporary scaffold, etc., and relates to a clamp device in which two clamps are connected and fixed to each other in a fixed direction.

  This type of clamping device is obtained by joining adjacent substrate portions of two clamps and fixing both clamps to each other in a fixed direction. 1, a hole with a square cylindrical peripheral wall (burring hole) is provided in the base plate part of one clamp, and the square cylindrical peripheral wall of the hole with the square cylindrical peripheral wall is provided in the base part of the other clamp. Is known in which a square hole penetrating in a relatively non-rotatable manner is provided, and the tip of the square cylindrical peripheral wall protruding from the square hole is curled outward to form a retaining collar.

JP 2005-36555 A

  In the conventional orientation-fixed clamping device as described above, since the square cylindrical peripheral wall of the hole with the square cylindrical peripheral wall is a 6-8 octagonal one, the square cylindrical peripheral wall and the opposite square hole Since the angle between the abutting oblique side and the virtual tangent at the position where the abutting oblique side comes into contact with the virtual circle concentric with the square cylindrical peripheral wall hole is small, both clamps are connected to the square cylindrical peripheral wall hole. When a large external force acting in the direction of relative rotation around the axis acts, the square cylindrical peripheral wall and the opposing square hole easily rotate relative to each other with deformation to the inside of the corner of the rectangular cylindrical peripheral wall. However, there is a problem that the desired anti-rotation effect cannot be obtained. Of course, it is conceivable to increase the angle between the abutting hypotenuse and the virtual tangent line by, for example, making the rectangular cylindrical peripheral wall into a quadrangular shape with a small number of corners, but in such a rectangular cylindrical peripheral wall, As described in Patent Document 1, one of the clamps provided with the hole with the square cylindrical peripheral wall is a free type in which the two clamps are relatively rotatable around the axis of the hole with the square cylindrical peripheral wall. It cannot be used as one of the clamps when assembling the clamp device, and becomes a clamp dedicated to the assembly of the fixed orientation clamp device.

  The present invention proposes a clamping device that can solve the above-described conventional problems, and the clamping device according to the present invention is intended to make it easier to understand the relationship with embodiments described later. When the reference numerals used in the description of the embodiment are shown in parentheses, the substrate parts (12, 14) adjacent to each other of the two clamps (1a, 1B) are joined together, and both clamps ( 1A, 1B) is fixed to each other in a fixed direction, the cylindrical portion (13a) projecting toward the other substrate portion (14) is provided on the substrate portion (12) of one clamp (1A). A burring hole (13) is provided, and a circular mounting hole (15) through which the cylindrical peripheral wall (13a) of the burring hole (13) can pass is provided in the base plate part (14) of the other clamp (1B). Recesses (16) are formed on the periphery of the circular mounting hole (15) at appropriate intervals in the circumferential direction, and pass through the circular mounting hole (15). The cylindrical peripheral wall (13a) of the burring hole (13) is curled at its tip outward to form a retaining collar (17), and at the periphery of the circular mounting hole (15) (16). This is a structure in which a rotation preventing projection (18) that bites into the pressure is formed by pressure.

  According to the configuration of the present invention described above, it is possible to assemble without using any separate parts by only pressing the cylindrical peripheral wall of the burring hole provided in the substrate portion of one clamp. When an external force in a direction that causes relative rotation around the axis of the burring hole is applied between the clamps, the rotation-preventing protrusion formed on the cylindrical peripheral wall of the burring hole and the substrate portion of the other clamp It is against the external force by the bite fitting part with the concave part of the peripheral edge of the circular mounting hole provided in this, but at this time, it bites and fits into the inner periphery of the circular hole for mounting provided with the concave part and the concave part. The anti-rotation protrusion is sandwiched between the retaining collar at the tip of the cylindrical peripheral wall and the substrate portion on which the cylindrical peripheral wall is connected. To the outside Even very large, with the exit to the interior of the rotation stop protrusion from expansion deformation or the inner recess of the recess, there is little possibility that disappears detent action between the two clamps.

  In other words, the inner diameter of the burring hole is made as large as possible, and the depth of the bite fitting between the recess and the rotation preventing projection is made as deep as possible. Even when a very large external force acting in a direction causing relative rotation is applied, both clamps can be used safely in a state in which both clamps are securely fixed in a predetermined direction. Further, according to the configuration of the present invention, the one clamp having the substrate portion provided with the burring hole is a circular hole through which the cylindrical peripheral wall of the burring hole penetrates the substrate portion of the clamp, particularly the peripheral edge for increasing the strength. By connecting the clamp with a circular hole with a burring process to the tip of the cylindrical peripheral wall of the burring hole by a method of forming only the retaining collar, both clamps are connected to the shaft of the burring hole. It can also be used as one of the free clamps that can freely rotate around the heart.

  The rotation preventing protrusion (18) is formed in the circular mounting hole (15) from the side opposite to the side where the retaining collar (17) is located in the recess (16) of the circular mounting hole (15). ) In the axial direction of the circular mounting hole (15), or the concave portion (16) of the circular mounting hole (15) so as to be fitted from the inside to the entire axial direction of the circular mounting hole (15). Can be formed. The former configuration facilitates pressure molding of the rotation preventing projection, and the latter configuration enhances the rotation preventing effect. Further, the recess (16) of the circular mounting hole (15) may be arranged so as to be adjacent to each other without any gap in the circumferential direction, and the inner periphery of the circular mounting hole may be formed in a continuous uneven shape, When the arcuate peripheral surface (15a) of the circular mounting hole (15) is left between the recesses (16) adjacent in the circumferential direction, and when viewed from the axial direction of the circular mounting hole (15) If the shape is substantially semi-circular, it is easy to connect and integrate the burring hole securely and concentrically with the circular mounting hole. Moreover, since there is no corner angle on the recess side where the non-rotating protrusion bites and fits, when a large external force is applied between both clamps, there is less possibility that the recess will crack and break.

FIG. 1A is a front view of the assembled clamping device, and FIG. 1B is a left side view thereof. FIG. 2A is a plan view showing a substrate portion of one clamp, and FIG. 2B is a longitudinal side view of the substrate portion. FIG. 3A is a bottom view showing a substrate portion of the other clamp, and FIG. 3B is a vertical side view of the substrate portion. FIG. 4A to FIG. 4C are vertical side views showing each stage of the work of connecting and integrating the substrate portions of the two clamps. 5A and 5B are bottom views at the work stage shown in FIGS. 4A and 4B, and FIG. 5C is a plan view at the work stage shown in FIG. 4C. 6A is an enlarged view of a main part of FIG. 4A, and FIG. 6B is a cross-sectional plan view of the main part. FIG. 7A is a longitudinal side view of a main part in a modification, and FIG. 7B is a transverse plan view of the main part. 8A to 8C are plan views showing modifications of the circular mounting holes, respectively.

  FIG. 1 shows a fixed orientation type clamping apparatus assembled according to the present invention. In this embodiment, two clamps 1A and 1B having the same structure are back-to-back with the steel pipes sandwiched between them being perpendicular to each other. It is connected and fixed to. Each clamp 1A, 1B is comprised from the base member 2, the pressing member 3 which can be opened and closed, and the screw means 4 for fastening. As shown in FIGS. 2 and 3, the base member 2 has a width in which an arm portion 5 which is provided obliquely outward from one end and has a bearing hole 5a at the tip and a bearing hole 6a at the other end is provided. The entire structure including the narrow bearing portion 6 has a U-shaped cross section provided with inwardly rising side plate portions on both left and right sides. The presser member 3 is one end of which is fitted into the tip of the arm portion 5 of the base member 2 and is pivotally supported in the bearing hole 5a by a support shaft 7 so as to be openable and closable with respect to the base member 2. The whole including the bifurcated portion 8 at the end has a U-shaped cross section provided with inwardly rising side plate portions on both left and right sides. The fastening screw means 4 is screwed into the screw shaft 10 and a screw shaft 10 having one end fitted into the bearing portion 6 of the base member 2 and pivotally supported by the support shaft 9 in the bearing hole 6a. And a nut 11.

  The use method of each clamp 1A, 1B is as is well known in the art, and the nut 11 is moved to the distal end side of the screw shaft 10 with the base member 2 and the presser member 3 sandwiching a fastened object such as a steel pipe. In this state, the screw shaft 10 is engaged with the bifurcated end 8 of the presser member 3, and in this state, the nut 11 is rotated in the screwing direction to press and swing the presser member 3 toward the base member 2. The object to be fastened is clamped and fastened between the pressing member 3 and the base member 2. Therefore, the inner peripheral edge of the rising side plate portion on the inner side of the base member 2 and the presser member 3 is configured to have a surface contact with the peripheral surface of the fastened object as much as possible.

  The connecting portion structure of the base member 2 of the two clamps 1A and 1B will be described. As shown in FIG. 2, it is coupled to one clamp, for example, the substrate portion of the base member 2 of the clamp 1A, that is, the other clamp 1B. The flat substrate portion 12 is integrally formed with a burring hole 13 having a cylindrical peripheral wall 13a protruding outward, and as shown in FIG. 3, the substrate portion of the other clamp 1B, that is, one clamp 1A and The flat base plate part 14 to be joined is provided with a circular mounting hole 15 having an inner diameter slightly larger than the outer diameter of the cylindrical peripheral wall 13a of the burring hole 13, and an inner peripheral edge of the circular mounting hole 15 has an appropriate circumferential direction. A plurality of recesses 16 are notched at intervals. The recesses 16 are provided at intervals at which the arcuate peripheral surface 15a of the circular mounting hole 15 remains between the recesses 16 adjacent in the circumferential direction (in the illustrated example, eight recesses are provided at equal intervals). The shape of the circular mounting hole 15 as viewed from the axial direction is substantially semicircular.

  The connecting method of the two clamps 1A and 1B will be described. As shown in FIGS. 4A and 5A, the cylindrical peripheral wall 13a in the burring hole 13 of one clamp 1A is inserted into the circular mounting hole 15 of the other clamp 1B, respectively. Are inserted so that the outer surfaces of the substrate portions 12 and 14 come into contact with each other, and the through-holes of the bearing holes 5a and 6a of the both substrate portions 12 and 14 (the clamps to which the clamps 1A and 1B in the completed clamping device are sandwiched, respectively) The two substrate portions 12 and 14 are rotated relative to each other around the axis of the circular mounting hole 15 in a direction in which the length direction of the fastener is orthogonal to each other. Next, as shown in FIG. 4B and FIG. 5B, the tip end portion of the cylindrical peripheral wall 13a protruding to the inside of the substrate portion 14 is curled outward by a conventionally known method so that the outer peripheral end is the substrate portion 14. The retaining collar 17 is formed to abut against the inner surface. Of course, in this state, the outer peripheral end of the retaining flange 17 may be brought into pressure contact with the inner surface of the substrate portion 14 so that relative rotation about the axis of the circular mounting hole 15 of both the substrate portions 12 and 14 is impossible. I can do it.

  Finally, as shown in FIG. 4C and FIG. 5C, the cylindrical peripheral wall 13 a is press-formed with a rotation-preventing protrusion 18 that bites into each recess 16 of the circular mounting hole 15. Specifically, as shown in FIGS. 4C and 5C, the cylindrical peripheral wall 13 a is pushed out to each recess 16 of the circular mounting hole 15 around a cylindrical body 19 having a diameter slightly smaller than the inner diameter of the cylindrical peripheral wall 13 a. A punch 21 having protrusions 20 for projecting in parallel with the axial direction is press-fitted into the burring hole 13 from the inside of the substrate part 12 provided with the burring hole 13, and as shown in FIG. An anti-rotation protrusion 18 that bites into and fits into each concave portion 16 of the circular mounting hole 15 in the axial direction of the circular mounting hole 15 from the side opposite to the side where the retaining hook 17 is provided. Is formed under pressure. Therefore, in this case, as shown in the drawing, the original cylindrical peripheral wall 13a is slightly left between each of the anti-rotation protrusions 18 and the retaining hooks 17. Of course, when the punch 21 is press-fitted into the burring hole 13, the retaining flange 17 formed by curling is received at the tip of the cylindrical peripheral wall 13 a by a mold.

  If the substrate portion 12 of the clamp 1A and the substrate portion 14 of the clamp 1B are connected and fixed back to back in such a manner that the through-holes of the bearing holes 5a and 6a of both the substrate portions 12 and 14 are orthogonal to each other as described above, By supporting the presser member 3 and the screw shaft 10 of the fastening screw means 4 on the respective base members 2, the clamped objects such as steel pipes are respectively attached to the clamps 1A and 1B, and their length directions are orthogonal to each other. A direction-fixed clamping device that can be fastened in a direction can be obtained. When the clamp device is in use, the relative movement of the clamps 1A and 1B in the direction away from each other in the axial direction of the burring hole 13 means that the base member 2 and the cylindrical peripheral wall 13a of the base member 2 of one clamp 1A. The clamp 1B is blocked by the periphery of the circular mounting hole 15 of the substrate portion 14 of the other clamp 1B, and the clamps 1A and 1B are blocked by the burring hole 13. The relative rotation around the axis of each of the clamps causes the rotation-preventing projections 18 formed by pressure on the cylindrical peripheral wall 13a of one clamp 1A and the circular mounting holes 15 of the base plate 14 of the other clamp 1B. It is blocked by circumferential contact with each recess 16.

  As shown in FIG. 7, the anti-rotation protrusion 18 is formed so as to be fitted from the inside into the whole area of the concave portion 16 of the circular mounting hole 15 in the axial direction of the circular mounting hole 15. You can also. Further, the recess 16 formed on the inner peripheral edge of the circular mounting hole 15 may basically have any shape, and the circumferential interval between the circular mounting holes 15 is not limited. For example, as shown in FIG. 8A, the recess 22 may be a horizontally long recess 22 whose length in the circumferential direction is longer than the recess depth, or the recess 23 having a shape close to a tapered triangle as shown in FIG. 8B. May be. Further, as shown by the concave portion 22 in FIG. 8A, the circumferential interval between the concave portions can be provided with about four concave portions with a sufficient interval in the circumferential direction, as shown by the concave portion 23 in FIG. 8B. In addition, recesses are provided at such a close interval that the inner peripheral edge of the original circular mounting hole 15 does not remain between the recesses adjacent to each other in the circumferential direction, and the inner periphery of the circular mounting hole 15 is continuously uneven (jagged). It may be configured. Of course, as shown in FIG. 8C, the number of semicircular recesses 16 shown in the previous embodiment can be increased by narrowing the circumferential interval.

  The clamp device of the present invention is a clamp device used for assembling a temporary scaffold, and can be used as a clamp device in which two clamps are connected and fixed to each other in a fixed direction.

DESCRIPTION OF SYMBOLS 1A, 1B Clamp 2 Base member 3 Pressing member 4 Fastening screw means 12, 14 Substrate part 13 Burring hole 13a Cylindrical peripheral wall 15 Circular mounting hole 15a Arc-shaped peripheral surface 16, 22, 23 Recessed part 17 Retaining prevention collar part 18 Stop projection 21 Punch

Claims (4)

  In a clamp device in which two clamps adjacent to each other are connected to each other and fixed to each other in a fixed direction, the clamp of one clamp has a cylindrical shape protruding toward the other substrate A burring hole having a peripheral wall is provided, and a circular mounting hole through which the cylindrical peripheral wall of the burring hole can pass is provided in the substrate portion of the other clamp. The cylindrical peripheral wall of the burring hole penetrating through the circular mounting hole is curled at the tip to form a retaining collar, and is formed at the peripheral recess of the circular mounting hole. A clamping device that presses and forms a protrusion for detent that bites in.   The anti-rotation protrusion is formed in the recess of the circular mounting hole so as to be fitted in the axial direction of the circular mounting hole from the side opposite to the side where the retaining hook is located. Item 2. The clamping device according to Item 1.   2. The clamp device according to claim 1, wherein the rotation-preventing projection is formed so as to be fitted from the inside to the entire region of the concave portion of the circular mounting hole in the axial direction of the circular mounting hole.   The concave portions of the circular mounting holes are provided at intervals between the concave portions adjacent to each other in the circumferential direction so that the arc-shaped peripheral surface of the circular mounting holes is left, and the shape when viewed from the axial direction of the circular mounting holes is The clamping device according to any one of claims 1 to 3, which is substantially semicircular.

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