Clamping and holding member

Abstract

To provide means, with a simple structure, for sandwiching and holding a holding object remarkably strongly like friction joint without any damage to the holding object.SOLUTION: A clamp-holding member has: a journal part 2 that performs journaling so as to move forward and backward and a holding body 4 that holds, at a fixed position, a receiving part 3 disposed facing the journal part; a pressing body inserted into the journal part, and capable of pressing a holding object by a pressing part facing the receiving part; and an operation part 16 attached to a shaft part disposed on the pressing body, and capable of operating the pressing body forward and backward. The pressing part is relatively rotatably disposed to a tip of the shaft part, and can press the holding object when moving the shaft part forward. The shaft part is screwed in a hole part of the journal part, and journaled so as to move forward and backward. The shaft part has, on an outer peripheral surface, both crew parts composed of a first spiral groove, and a second spiral groove formed so as to be overlapped with the first spiral groove in at least some area in the area where the first spiral groove is formed and set in mutually different lead angles and / or lead directions. The first spiral groove can be screwed into the hole part, and the second spiral groove can be screwed into the operation part.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a clamping and holding member that clamps, joins, and holds an object to be held. [Background technology]

[0002] Conventionally, screw-type clamps having a pair of opposing arms sandwiching an opening are known as components for holding two or more overlapping objects to be held (see, for example, Patent Document 1). Such screw-type clamps are attached by attaching a receiving plate to one arm of the clamp body and screwing a fastening bolt into the other arm. A handle is provided at one end of the fastening bolt, and by operating the handle, the fastening bolt rotates and moves toward the receiving plate. The tip of the fastening bolt presses against the object to be held, and the receiving plate supports the pressed object, resulting in the object to be held being clamped and pressed. In addition, as a method for holding two or more overlapping objects to be held, a friction joint is widely used in which a bolt is inserted into a bolt hole that passes through the objects to be held and the bolt is fastened with a nut to sandwich the objects to be held. In this type of friction joint, the tensile force generated in the bolt is used to press the objects to be held. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-217456 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the screw-type clamp described in the above-mentioned Patent Document 1, the fastening bolt rotates while being pressed against the object to be held, so that the tip of the fastening bolt slides against the object and presses it until the object is clamped with sufficient clamping force. In such a case, the surface of the object to be held is scraped by the sliding contact of the fastening bolt, and the pressing while sliding can easily cause multiple concentric groove-like scratches, resulting in damage to the object to be held. In addition, because the fastening bolt is screwed into the arm, vibrations and forces perpendicular to the axis are transmitted to the fastening bolt via the object to be held, causing rattle in the axial direction. Therefore, even if the bolt is tightly fastened, once rattle occurs, the fastened state can easily come undone, resulting in the problem that the object to be held cannot be clamped. Furthermore, in the case of a friction joint in which a bolt is inserted into a bolt hole in a held object and the held object is sandwiched between the bolt and the nut, processing or the like is required to provide a bolt hole in the held object.

[0005] The present invention was made in consideration of the above problems and was made through extensive research by the inventor, and has an object to provide a means for extremely firmly gripping and holding an object to be held without damaging the object. [Means for solving the problem]

[0006] The present invention In one aspect The fastening member is A pressing body and a pressing body are inserted a support body that supports the pivotal portion so as to be movable forward and backward and that supports a receiving portion that faces the pivotal portion in a fixed position; The pressing body is provided , facing the receiving portion do Pressure that can press the object to be held Departmentand an operating portion attached to a shaft portion provided on the pressing body and operable to advance and retreat the pressing body, the pressing portion being rotatably provided at the tip portion of the shaft portion relative to the tip portion and capable of pressing the held object when the shaft portion advances, the shaft portion being supported within a hole portion of the support portion so as to be capable of threading forward and backward, the shaft portion having both thread portions consisting of a first spiral groove set at an appropriate lead angle and / or lead direction on its outer circumferential surface and a second spiral groove formed so as to overlap in at least a portion of the region in which the first spiral groove is formed and set at a lead angle and / or lead direction different from the lead angle and / or lead direction, the first spiral groove being capable of screwing into the hole portion, and the second spiral groove being capable of screwing into the operating portion.

[0007] The fastening and holding member of the present invention is characterized in that the receiving portion has a support member that is in surface contact with the object to be held and is tiltable relative to the object to be held.

[0008] The fastening and retaining member of the present invention is characterized in that the receiving portion has a recess having a spherical or cylindrical bottom surface, the support member has a convex portion shaped to fit into the recess, and the support member is arranged within the recess so that the convex portion can slide against the bottom surface.

[0009] The fastening and holding member of the present invention is characterized in that the support member has an uneven surface that abuts against the object to be held.

[0010] The fastening and holding member of the present invention is characterized in that the center of the support member is located at a position shifted in a direction perpendicular to the axis from a position facing the shaft portion. Effect of the Invention

[0011] According to the present invention, it is possible to clamp and hold an object to be held extremely firmly, similar to friction welding, with a simple structure and without damaging the object to be held. [Brief description of the drawings]

[0012] [Figure 1]4A and 4B are diagrams showing a fastening and holding member according to the present embodiment. [Diagram 2] FIG. 2 is a cross-sectional view showing a fastening and holding member of the present embodiment. [Diagram 3] FIG. 2 is a perspective view showing a shaft portion of the embodiment. [Figure 4] FIG. 4 is a cross-sectional view showing a support portion of the present embodiment. [Diagram 5] FIG. 13 is a diagram showing a tilting support part. [Figure 6] 13A and 13B are diagrams illustrating how an object to be held is pinched by a rotation operation of the operating unit. [Figure 7] 11A and 11B are diagrams illustrating a pressing force of a support portion against a held object. [Figure 8] 13A and 13B are diagrams illustrating other configuration examples of the pressing body. [Figure 9] 13A and 13B are diagrams showing other examples of the fastening retaining member. [Figure 10] 13A and 13B are diagrams illustrating other examples of the support portion. [Figure 11] FIG. 4 is a cross-sectional view showing a fastening holding member. [Figure 12] 11A and 11B are diagrams illustrating an example of connection between a shaft portion and a pressing portion. [Figure 13] FIG. 13 is a diagram showing an example of a shaft portion. [Figure 14] FIG. 2 is a cross-sectional view showing a fastening and holding member 1. [Figure 15] 11A and 11B are diagrams illustrating displacement of a shaft portion by a rotation operation of the operation unit. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] An embodiment of the fastening and holding member of the present invention will be described below with reference to the drawings. Fig. 1 is a view showing the appearance of the fastening and holding member of this embodiment, and Fig. 2 is a cross-sectional view showing the fastening and holding member of this embodiment. The fastening and holding member 1 comprises a support part 2 and a holder 4 that holds a receiving part 3 arranged opposite the support part 2 in a fixed position so as to form a substantially C-shape, G-shape, U-shape, or V-shape.

[0014] Moreover, the fastening and holding member 1 has a compression frictional joining structure. That is, in the fastening and holding member 1, a pair of objects to be held are disposed between the pivot support portion 2 and the receiving portion 3, with the tip of the pressing body 10 (described later) pressing the objects to be held, and the supporting member 20 (described later) supporting the objects to be held. In this way, the pair of objects to be held is joined by the compressive axial force acting on the pressing body 10, and the structure prevents wobbling of the pressing body 10 in the direction perpendicular to the axis relative to the pivot support portion 2, firmly maintaining the frictional joining state in which the pressing body 10 presses the objects to be held and the supporting member 20 supports the objects to be held.

[0015] The axial support portion 2 axially supports the pressing body 10 so that it can advance and retreat. Specifically, it has a hole portion 6 for inserting the pressing body 10 so that it can axially support the pressing body 10 so that it can advance and retreat. The pressing body 10 has a shaft portion 12, a pressing portion 14 that can press the held object, and an operating portion 16 that allows the pressing body 10 (shaft portion 12) to be operated to advance and retreat without rotation.

[0016] 3 is a perspective view showing the shaft portion 12 of this embodiment. The shaft portion 12 has a first region 12a from one end side to the middle portion that can be inserted into the hole portion 6, and a second region 12b from the other end side to the middle portion that can accommodate the operating portion 16.

[0017] The cross-sectional shape of the first region 12a is set so as to be substantially the same as the hole shape of the hole 6. Here, it is set to a hexagonal cross-sectional shape that is circumferentially engaged by the inner peripheral surface of the hole 6. The cross-sectional shape of the first region 12a may be any shape that can be circumferentially engaged with the hole 6, and may be, for example, a polygonal shape, an elliptical shape, an oval shape, a shape having one or more pairs of two-sided widths, a D-shaped cross-section with a part of the peripheral surface cut out, or the like. Of course, the shape of the hole 6 is set to correspond to the cross-sectional shape of the first region 12a, so when the first region 12a is set to a hexagonal cross-sectional shape, it is preferable to set the shape of the hole 6 to a hexagonal shape. The cross-sectional shape of the first region 12a and the cross-sectional shape of the hole 6 do not necessarily need to be the same, and each shape may be set so that they do not rotate relative to each other when inserted into each other. However, it is desirable to determine the shape and dimensions so that there is no clearance or unnecessary gap between the first region 12a and the hole 6, the outer peripheral surface of the first region 12a is in close contact with the inner peripheral surface of the hole 6, and the shaft portion 12 does not rattle in the direction perpendicular to the axis.

[0018] The second region 12b has a left-handed male screw helical groove on the outer circumferential surface for arranging an operation unit 16 described later. The second region 12b is set so that the maximum radius (diameter of the male screw thread) is smaller than the minimum radius (for example, the length from the axis to one side of the hexagonal cross section) in the first region 12a. The pressing portion 14 forms the tip end of the first region 12a, and the surface that comes into contact with the object to be held is configured to have an uneven shape.

[0019] The operating portion 16 is a generally cylindrical member having a left-handed female thread on its inner circumferential surface, and is attached to the shaft portion 12 so as to surround the second region 12b. That is, the operating portion 16 is attached to the shaft portion 12 by being screwed into the male thread helical groove of the second region 12b, and further supports the shaft portion 12 so as to be able to reciprocate in the axial direction within the range where the operating portion 16 and the second region 12b are screwed together. This allows the shaft portion 12 to be moved back and forth by rotating the operating portion 16.

[0020] In addition, the operating portion 16 is set to have a hexagonal shape so that the outer circumferential surface can be engaged with a fastening tool such as a wrench. Of course, the outer shape may be a polygonal shape other than a hexagon, a shape having at least one set of two faces that are parallel to each other and sandwich the axis, a shape including multiple projections and recesses, or any other structure that can be engaged with a fastening tool such as a wrench.

[0021] Further, the axial displacement of the operating part 16 relative to the pivot support part 2 is restricted. For example, a position restriction cover 18 for fixing the operating part 16 to the pivot support part 2 is attached. The position restriction cover 18 surrounds the operating part 16 and the shaft part 12, and engages with the operating part 16 in the axial direction to restrict the axial displacement of the operating part 16. That is, the position restriction cover 18 has a substantially cylindrical shape and includes an engagement part 18a that protrudes radially inward from one end of the inner circumferential surface and engages with the operating part 16 in the axial direction.

[0022] Moreover, the position restriction cover 18 is fixed to the pivot support portion 2. Specifically, the position restriction cover 18 has a right-handed female thread portion 18b on the inner circumferential surface surrounding the pivot support portion 2, and the pivot support portion 2 has a male thread portion that screws into the female thread portion 18b. The position restriction cover 18 is fixed to the pivot support portion 2 by screwing the respective thread portions into each other.

[0023] The receiving portion 3 tiltably mounts a support member 20 that supports a hold target pressed by the pressing body 10. Specifically, the receiving portion 3 has a recess 8 formed on an extension of the axis of the hole portion 6 for mounting the support member 20 tiltably relative to the hold target. The recess 8 has a substantially hemispherical bottom surface so that the support member 20 can slide against it. The support member 20 can be mounted in the recess 8 by a fastening member such as a bolt. For this purpose, a female screw hole 8a may be formed in the center of the bottom surface of the recess 8. The female screw hole 8a is formed on an extension of the axis of the hole portion 6.

[0024] 4 is a cross-sectional view showing the support member 20 of this embodiment. The support member 20 has a convex portion 22 that is convex and fits into the recess 8, and a contact surface 24 that is aspheric and contacts the object to be held. The size of the cross-sectional area of ​​the contact surface 24 is set so that the shear strength of the contact surface 24 is stronger than the shear strength of the second region. For example, if the cross-sectional area of ​​the contact surface 24 is S and the cross-sectional area of ​​the second region at the effective diameter is A,

number

[0025] The contact surface 24 may have an uneven surface, for example. Such unevenness may be minute unevenness, and may function to prevent slippage between the friction surface and the object to be held, and to engage with the object to be held. The uneven contact surface 24 may be formed by blasting, providing an anti-slip material, or the like. Instead of providing minute unevenness, a treatment such as coating with an anti-slip paint or spraying with an anti-slip spray may be performed.

[0026] The uneven shape of the contact surface 24 may be mountain-shaped, wavy, or the like, and may extend continuously or intermittently in a predetermined direction. It may also be minute unevenness formed in the circumferential and radial directions, such as a so-called knurl. Of course, the shape and size of the unevenness are not particularly limited, and may be set to any appropriate shape and size as long as it can be engaged with the object to be held. The height of the uneven shape of the contact surface 24 can be set so that the contact surface with the object to be held can be deformed and penetrated. In particular, if the deformation is set within the range of elastic deformation, the object to be held can be firmly held without being damaged, but it is also possible to set the height so that the deformation reaches the range of plastic deformation.

[0027] The insertion hole 26 has a concave portion 28 on the contact surface 24 side that is expanded in diameter so that the head of the bolt 19 can fit therein. The concave portion 28 has a bottom that is set to a spherical shape that is approximately concentric with the spherical portion 20. The insertion hole 26 has an inner diameter that is larger than the outer diameter of the bolt 19 and has an inverted tapered shape that gradually expands in diameter from the concave portion 28 side toward the convex portion 22 side.

[0028] Therefore, the support member 20 is installed in the recess 8 so that the insertion hole 26 communicates with the female threaded hole 8a, and as a result, is disposed opposite the pressing portion 14. Then, the bolt 19 is inserted through the insertion hole 26 and screwed into the female threaded hole 8a, and the support member 20 is fixed to the receiving portion 3. The support member 20 disposed in the recess 8 has a gap 50 between the insertion hole 26 and the bolt 19 as shown in FIG. 5(a), and therefore can tilt by the gap 50 as shown in FIG. 5(b). If the gap 50 is configured to be substantially conical (frustum of a cone), it is effective in widening the tilt angle of the support member 20. Here, since the spherical convex portion 22 of the support portion 29 fits into the recess 8, the support portion 29 can tilt in substantially all directions in a plan view. That is, in the state shown in FIG. 5, the support portion 29 can tilt left and right, toward the front, and toward the back.

[0029] Next, a description will be given of the axial displacement of the shaft portion 12 (pressure body 10) accompanying the rotational operation of the operating portion 16. As described above, the shaft portion 12 is screwed into the operating portion 16 and locked in the circumferential direction relative to the hole portion 6, that is, the relative rotation with respect to the pivot support portion 2 is restricted. In addition, the axial displacement of the operating portion 16 with respect to the pivot support portion 2 is restricted by the position restriction cover 18. Therefore, when torque is applied to the operating unit 16, the shaft portion 12 is displaced in the axial direction without rotating relative to the pivot support portion 2. In other words, when the operating unit 16 is rotated, the rotation of the shaft portion 12 is restricted by the pivot support portion 2, and as a result, the operating unit 16 rotates relative to the shaft portion 12. In addition, the operating part 16 and the shaft part 12, which are screwed together, can be screwed in the axial direction by the relative rotation of the operating part 16 with respect to the shaft part 12, but since the axial displacement of the operating part 16 is regulated, only the shaft part 12 displaces in the axial direction without rotating relative to the support part.

[0030] As a result, when the operating unit 16 is rotated to the right (clockwise), the shaft 12 is displaced in a direction approaching the receiving unit 3. On the other hand, when the operating unit 16 is rotated to the left (counterclockwise), the shaft 12 is displaced in a direction retracting from the receiving unit 3.

[0031] When the fastening holding member 1 is to clamp an object to be held between the pressing portion 14 and the support member 20, first, as shown in FIG. 6(a), the operating portion 16 is rotated left to retract the shaft portion 12 relative to the support member 20, thereby providing a space between the pressing portion 14 and the support member 20 large enough to position the object to be held.

[0032] Next, the object to be held is placed in the space between the pressing portion 14 and the support member 20. Here, two objects to be held are placed in an overlapping state. Therefore, after the object to be held is placed in the space between the pressing portion 14 and the support member 20 as shown in FIG. 6(b), the operating portion 16 is rotated right to advance the shaft portion 12 toward the support member 20 as shown in FIG. 6(c). By further rotating the operating portion 16 right, the pressing portion 14 comes into contact with and presses the object to be held. That is, the pressing body 10 presses the object to be held by advancing the shaft portion 12.

[0033] When the object to be held is sandwiched between the pressing body 10 and the supporting member 20, the supporting member 20 can suppress the displacement of the object to be held in the direction perpendicular to the axis. For example, when the object to be held is subjected to an external force in the right direction as shown by the arrow A in FIG. 7, the supporting member 20 supporting the object to be held tilts to more firmly support the object to be held. That is, the friction surface and / or the unevenness of the abutment surface 24 between the object to be held and the supporting member 20 engages (digs into) the object to be held, so that an external force in the right direction along the arrow A acts on the supporting member 20, and a couple of forces acts to tilt the supporting member 20 to a position in which the right end protrudes as shown in FIG. 5(b). Therefore, a part of the supporting member 20 presses the object to be held toward the pressing body 10 so as to protrude toward the object to be held.

[0034] As described above, according to the fastening and holding member 1 of this embodiment, the operating portion 16 is rotated to displace the shaft portion 12 in the axial direction, but the shaft portion 12 displaces in the axial direction without rotating. Therefore, the pressing portion 14 presses the surface of the object to be held without sliding on it. Therefore, the object to be held can be sandwiched between the pressing portion 14 and the support member 20 without damaging it.

[0035] Furthermore, because the shaft portion 12 does not rattle in the axial direction within the hole portion 6, the shaft portion 12 and the operating portion 16 cannot rotate relative to each other due to vibrations transmitted from the object to be held or external forces perpendicular to the axis. Therefore, the pressing body 10 does not displace in the axial direction, and the object to be held can be clamped and held extremely firmly, similar to conventional tensile friction joining in which the object to be held is clamped and joined with a bolt and a nut, and a compression friction joining can be realized. Therefore, the fastening holding member 1 can press the tip end (pressing portion 14) of the pressing body 10 against the held object, and can frictionally join the held object while holding the held object extremely firmly. Also, since the pressing body 10 is prevented from rattling in the direction perpendicular to the axis relative to the pivot support portion 2, the frictionally joined state can be maintained even if an external force in the direction perpendicular to the axis acts on the pressing body 10 via the held object.

[0036] Furthermore, since the support member 20 is installed so as to be tiltable, if an external force is applied in a direction that may cause the held object to come out of the state in which it is held between the pressing body 10 and the support member 20, the support member 20 will tilt and press the held object toward the pressing body 10, thereby holding the held object more firmly, thereby preventing the held object from coming out. When a tapered object to be held is to be sandwiched, the support member 20 tilts along the taper, making it possible to sandwich the object in a tight contact state.

[0037] In the above-described embodiment, the cross-sectional shape of the first region 12a of the shaft portion 12 and the shape of the hole portion 6 are substantially hexagonal, and the rotation of the shaft portion 12 is locked within the hole portion 6 so that the pressing body 10 does not rotate relative to the journal portion 2. However, the structure in which the pressing body 10 does not rotate relative to the journal portion 2 is not limited to this. For example, an intervening member may be disposed between the shaft portion 12 and the hole portion 6 to prevent the pressing body 10 from rotating relative to the journal portion 2.

[0038] 8 is a diagram showing another example of the configuration of the pressing body. The pressing body 30 can be composed of a shaft portion 32, an intervening member 34, the pressing portion 14, the operating portion 16, a position regulating cover 18, etc. In this case, the hole portion 6 has a fitting hole 40 at its open end into which the intervening member 34 can be disposed.

[0039] The shaft portion 32 has a first region 32a having a circular cross section that can be inserted into the hole 6 from one end side to the middle, and a second region 32b into which the operating unit 16 can be attached from the other end side to the middle. The first region 32a is set to have a larger diameter than the second region 32b. The shape of the hole 6 is a circle or the like that can insert the shaft portion 32, and is set to a circle of a size that is approximately equivalent to the outer shape and outer diameter of the first region 32a. Therefore, the first region 32a can be inserted into the hole 6 so as to be able to advance and retreat without any rattling.

[0040] The second region 32b has a left-handed male screw portion formed on its outer circumferential surface. The second region 32b also has a notched surface 38 formed by cutting out the male screw portion along the axial direction. The second region 32b has a maximum outer diameter set smaller than the outer diameter of the first region 32a.

[0041] The intervening member 34 is annular, with an inner circumferential surface shaped to allow the second region 32b to be inserted therein, and an outer circumferential surface shaped to be inserted into the fitting hole 40. The intervening member 34 also has an engagement surface 36 on its outer surface, the length of which gradually decreases from the center. The fitting hole 40 has a hole shape into which the interposition member 34 is inserted. That is, the fitting hole 40 has a hole shape corresponding to the outer shape of the interposition member 34, and a part of the inner circumferential surface engages with the engagement surface 36 in the circumferential direction.

[0042] The pressing body 30 is assembled by inserting the shaft portion 32, with the second region 32b of the intervening member 34 inserted therethrough, into the hole portion 6. At this time, the shaft portion 32 is inserted into the hole portion 6 to a position where the intervening member 34 is inserted into the fitting hole 40. Then, the operating portion 16 is screwed into the male thread portion of the second region 32b, and the position regulating cover 18 is fixed to the shaft support portion 2, thereby completing the assembly.

[0043] With such a pressing body 30, the pressing body 30 can be displaced in the axial direction without rotating relative to the object to be held. Therefore, the pressing portion 14 presses the surface of the object to be held without sliding on it. Therefore, the object to be held can be sandwiched between the pressing portion 14 and the support member 20 without damaging it. Furthermore, since the shaft portion 32 does not rattle in the axial direction within the hole portion 6, the pressing body 30 does not displace in the axial direction, and a frictionally joined state in which the object to be held is extremely firmly clamped and held can be maintained.

[0044] Furthermore, although the support member 20 is disposed opposite the pressing body 10, the positions of the support member 20 and the pressing body 10 can be set as appropriate. That is, the axis of the bolt 19 inserted into the support member 20 may be located on an extension of the axis of the hole 6, or may be biased toward the opposite side of the holding body 4 with respect to the axis of the hole 6. That is, the support member 20 may be disposed shifted in the direction perpendicular to the axis from directly in front of the pressing body 10, such that the axis c2 of the bolt 19 shown by the dashed line in Fig. 9 is biased toward the opposite side of the holding body 4 with respect to the axis c1 of the hole 6 shown by the broken line. 9, when a force in the direction away from the holder 4 as indicated by the arrow A acts on the object to be held, the end of the support member 20 on the holder 4 side tilts so as to press the object to be held towards the pressing body 10. In other words, the pressing position of the support member 20 is close to the position facing the axis of the pressing body 10, and the object to be held can be more stably held by pinching it.

[0045] Also, the convex surface portion 22 of the support member 20 is spherical, but of course it is not limited to this, and may be cylindrical as shown in Fig. 10. When the convex surface portion 22 is cylindrical, the tilting direction is determined to be two opposite directions. When the convex surface portion 22 is cylindrical, it is preferable that the bottom surface of the recess 8 is cylindrical so that the convex surface portion 22 can be slidably fitted therein. In addition, the shape of the abutment surface 24 of the support member 20 in a plan view can be set as appropriate, and may be a circle as shown in FIG. 1 or a rectangle as shown in FIG. 10, or may be a polygonal shape other than a rectangle, such as a triangle or a pentagon, an ellipse, an oval, or the like.

[0046] In addition, the above-mentioned pressing body has been described as being capable of advancing and retreating without rotating relative to the support portion, but the pressing body may be configured so that the shaft portion rotates, at least as long as the pressing portion does not slide against the object to be held. For example, the pressing body may be configured such that the pressing portion is formed separately from the shaft portion and the pressing portion is loosely fitted onto the shaft portion, so that the shaft portion is rotatable relative to the pressing portion.

[0047] 11 is a cross-sectional view showing a fastening holding member, and a pressing body 60 can be composed of a shaft portion 62 and a pressing portion 64. The shaft portion 62 is a male screw-like member with a helical rib formed over almost the entire outer circumferential surface. The pressing portion 64 is formed so as to be attachable to the tip of the shaft portion 62, and has an uneven surface facing the support member 20, i.e., an uneven surface that abuts against the object to be held. The shaft support portion 2 also has a female screw helical groove on the inner circumferential surface forming the hole portion 6 that screws into the helical rib of the shaft portion 62.

[0048] Here, Fig. 12 is a diagram showing an example of connection between the shaft portion 62 and the pressing portion 64. As shown in Fig. 12(a), the pressing portion 64 has a convex portion 62a on its inner peripheral surface that covers the tip of the shaft portion 62 and has a concave cross-sectional shape capable of surrounding the outer peripheral surface, and that protrudes radially inward. Meanwhile, a circumferential groove 64a is formed on the outer peripheral surface on the tip side of the shaft portion 62. Here, the protruding length of the convex portion 62a is set so that it interferes with the outer peripheral surface of the shaft portion 62 and fits loosely into the circumferential groove 64a.

[0049] The pressing portion 64 is attached to the shaft portion 62 by disposing the pressing portion 64 on the tip side of the shaft portion 62 and pressing the pressing portion 64 in the axial direction so that the protrusion 62a fits into the circumferential groove 64a. In this way, the pressing portion 64 is rotatably supported on the shaft portion 60.

[0050] Of course, the connection between the shaft portion 62 and the pressing portion 64 is not limited to the above, and can be made by any suitable method. For example, as shown in Fig. 12(b), a spherical tip portion 62b may be provided on the shaft portion 60, and the pressing portion 64 may surround the tip portion 62b and engage with it in the axial direction. That is, the pressing portion 64 may have a recess 64b with a narrowed opening, and the tip portion 62b and / or the recess 64b may be elastically deformed so that the tip portion 62b fits into the recess 64b. In this manner, the pressing portion 64 can also be connected to the shaft portion 62 so as to be capable of relative rotation. The cross-sectional area, etc., of the pressing portion 64 may be set so that the shear strength is stronger than that of the shaft portion 62. For example, in the same manner as in the above formula 1, the cross-sectional area S of the pressing portion 64 relative to the cross-sectional area A at the effective diameter of the thread of the shaft portion 62 is expressed as follows:

number

[0051] According to the above configuration, since the uneven surface of the pressing portion 64 comes into contact with the held object, it is possible to set the friction between the pressing portion 64 and the held object to be greater than the friction between the pressing portion 64 and the shaft portion 62. Therefore, when the pressing portion 64 is in contact with the held object, it is possible to prevent the pressing portion 64 from freely rotating with respect to the shaft portion 62 and sliding against the held object.

[0052] 13 is a diagram showing an example of a shaft portion 70, which may have different male thread structures at one end and the other end. That is, the shaft portion 70 has a supported threaded portion 72 at one end (a region corresponding to the above-mentioned first region) which is made of a right-handed helical thread and which is arranged to be screwed into a female thread helical groove provided on the inner peripheral surface of the shaft support portion 2. The shaft portion 70 also has a double threaded portion 74 at the other end (a region corresponding to the above-mentioned second region) of male thread helical grooves of both threads in which a right-handed helical groove and a left-handed helical groove are overlapped and formed in the same region.

[0053] Both threaded portions 74 are formed by overlapping two types of male thread spiral grooves, a first male thread spiral groove which is a right-handed thread and a second male thread spiral groove which is a left-handed thread, in the same region. In both threaded portions 74, approximately crescent-shaped threads 76 that continue in a surface direction perpendicular to the axis (screw axis) are alternately provided on one side (right side in FIG. 13) and the other side (left side in FIG. 13) of the shaft portion 70. By configuring the threads 76 in this way, two types of spiral grooves, a right-handed spiral groove and a left-handed spiral groove, can be formed between the threads 76. Therefore, both threaded portions 74 can be screwed with either a right-handed or left-handed female thread body.

[0054] 14 , when the pressing body 10 is configured using the shaft portion 70, the supported threaded portion 72 of the shaft portion 70 is supported by being screwed into the pivot support portion 2 within the hole portion 6, and the operating portion 16 is screwed into the second male screw helical grooves of both threaded portions 74. The first male screw helical grooves of both threaded portions 74 can be screwed into the hole portion 6. The axial position of the operating portion 16 with respect to the pivot support portion 2 is regulated by the position regulating cover 18.

[0055] The pressing body 10 rotates the operating unit 16 relative to the shaft portion 70, and rotates the shaft portion 70 in the opposite direction by the reaction of the torque applied to the operating unit 16. That is, as shown in Fig. 15(a), when the operating unit 16 is rotated right, the shaft portion 70 rotates left with respect to the pivot support portion 2 in reaction to the torque applied to the operating unit 16, and is displaced in a direction retracting from the support member 20. Also, as shown in Fig. 15(b), when the operating unit 16 is rotated left, the shaft portion 70 rotates right with respect to the pivot support portion 2 in reaction to the torque applied to the operating unit 16, and is displaced toward the support member 20.

[0056] In this way, even when the operating section 16 is screwed onto both threaded sections 74 of the shaft section 70, when torque is applied to the operating section 16, a torque acts on the shaft section 70 in the opposite direction, causing the shaft section 70 to rotate and displace in the axial direction. This makes it possible to press the object to be held, thereby enabling the object to be clamped and held.

[0057] Furthermore, although the pressing portion 64 is configured as a separate body from the shaft portion, the cross-sectional area of ​​the pressing portion 64 is set so that it has a stronger shear strength than the shaft portion. This makes it possible to prevent the pressing portion 64 from shearing prior to the shaft portion even if it is in direct contact with the object to be held. In addition, it is possible to prevent the pressure applied by the pressing body 10 from being released due to vibration from the held object and a force perpendicular to the axis. This is because the shaft portion 70 cannot rotate relative to the hole portion 6 and the operating portion 16 at the same time.

[0058] Specifically, the supported threaded portion 72 of the shaft portion 70 that is threaded into the hole portion 6 and the two threaded portions 74 that are threaded into the operation portion 16 are displaced in different axial directions due to relative rotation. When only the shaft portion 70 is rotated clockwise, the region that is threaded into the hole portion 6 (supported threaded portion 72) is displaced in the axial direction toward the support member 20. In contrast, the region of the shaft portion 70 that is threaded into the operation portion 16 (two threaded portions 74) is displaced in the axial direction so as to retract from the support member 20.

[0059] Therefore, the shaft portion 70 tries to displace in opposite directions in two regions (the supported threaded portion 72 and both threaded portions 74), and as a result, the shaft portion 70 cannot rotate relative to the hole portion 6 and the operating portion 16 at the same time. Therefore, the pressing body 10 can frictionally join the held object while holding it extremely firmly without displacing in the axial direction. Furthermore, the pressing body 10 can maintain the frictionally joined state even when it is subjected to vibration or an external force perpendicular to the axis via the held object. [Explanation of symbols]

[0060] 1...tightening and holding member, 2...axial support portion, 3...receiving portion, 4...holding body, 10, 30, 60...pressing body, 12, 32, 62, 70...axial portion, 14, 64...pressing portion, 16...operating portion, 18...position regulating cover, 20...supporting member, 22...convex portion, 24...contact surface, 26...insertion hole, 34...intervening member, 40...engagement hole, 62a...convex portion, 64a...circumferential groove, 72...supported screw portion, 74...both screw portions.

Claims

1. A device comprising: a pressing body; a support part into which the pressing body is inserted and supported so as to be movable back and forth; a holder which holds in fixed positions a receiving part which is disposed opposite the support part; a pressing part which is provided on the pressing body and which faces the receiving part and can press a held object; and an operating part which is attached to the shaft part provided on the pressing body and which allows the pressing body to be operated to move back and forth; The pressing portion is provided at the tip portion of the shaft portion so as to be relatively rotatable, and can press the held object when the shaft portion advances, The shaft portion is supported in the hole of the support portion so as to be capable of threadingly advancing and retreating, the shaft portion has two threaded portions, each of which has a first spiral groove set on an outer circumferential surface thereof at an appropriate lead angle and / or lead direction, and a second spiral groove formed so as to overlap with at least a portion of an area in which the first spiral groove is formed, and set at a different lead angle and / or lead direction from the lead angle and / or lead direction, A fastening and retaining member, wherein the first spiral groove can be screwed into the hole portion, and the second spiral groove can be screwed into the operating portion.

2. 2. The fastening and holding member according to claim 1, wherein the receiving portion has a support member that is in surface contact with the object to be held and is tiltable with respect to the object to be held.

3. The receiving portion has a recess having a spherical or cylindrical bottom surface, the support member has a protrusion that is shaped to fit into the recess, 3. The fastening and holding member according to claim 2, wherein the support member is disposed within the recess so that the protrusion can slide against the bottom surface.

4. 4. The fastening and holding member according to claim 2, wherein the support member has an uneven surface that comes into contact with the object to be held.

5. 5. A fastening and holding member according to claim 2, wherein the center of said support member is shifted in a direction perpendicular to the axis from a position facing said shaft portion.

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