JP2005188670A - Fastening device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fastening device capable of inexpensively carrying out connection/disconnection of a supply passage of an operating pressure fluid to a tool or the like fixed to one of two members to be fastened. <P>SOLUTION: A first outward flange part 56 and a second outward flange part 24 integrally formed on the respective outer peripheral surfaces of a fastening bush 10 and a fastening pin 12 to perform axial positioning thereof are provided with a first passage 70 and a second passage 72 through which the pressure fluid can flow. The respective passages 70, 72 are provided therein with opening/closing mechanisms 88, 86 for communicating the first passage 70 and the second passage 72 with each other by opening the aligned face side openings of the respective passages 70, 72 when the first and second outward flanges parts 56, 24 abut on each other while impeding communication between the first passage 70 and second passage 72 by closing the aligned face side openings of the respective passages 70, 72 in the non-abutting state of the first and second outward flange parts 56, 24. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a fastening device, and in particular, a fastening device that can be suitably used to fasten a base element attached to a machine tool table such as a machining center and a jig plate to which a predetermined jig is fixed. It is about improvement.

  Conventionally, there are various structures of fastening devices for fastening the first and second members to be fastened to each other, and the shape and use of the member to be fastened are among them. Are appropriately selected and used. For example, various fastening devices are also used in machine tools such as machining centers.

  That is, in general, in a machine tool such as a machining center, various jigs such as a clamp and a vise are used to hold a workpiece to be machined. In many cases, the jig plate is fixed to a jig plate, and various jigs are attached to the base element by fastening the jig plate to the base element. It is supposed to be. A predetermined fastening device is used for fastening the jig plate and the base element to each other.

  As one of such fastening devices, Patent Document 1 listed below discloses a fastening pin that is fixed to a base element or a jig plate and fixed to any one of the base element and the jig plate. A fastening device is disclosed that has a fastening bush that is attached to a fixed position and that can be inserted and fitted with a fastening pin in the axial direction. In this fastening device, a predetermined screw member screwed into a screw hole provided in the fastening pin is screwed into the screw hole so that the fastening pin is inserted into the fastening bush in the axial direction. By being moved, the steel ball arranged inside the fastening pin is pressed and moved in the direction perpendicular to the axial direction by the pressing surface that is moved together with the screw member, and the fastening pin A portion provided on the inner peripheral surface of the fastening bush with respect to the projecting portion of the steel ball in a state in which the fastening pin is inserted into the fastening bush when being inserted into the fastening bush. The engaging portions are engaged with each other, and the engaging portions provided on the outer peripheral surface of the fastening bush are engaged with the fastening pins so that the fastening pins are inserted into the fastening bush. And it is configured such that the relative movement can be prevented in the axial direction.

  If the fastening device having such a structure is used, with the fastening pin and the fastening bush attached to the base element and the jig plate, respectively, the fastening pin is simply inserted into the fastening bush, and the screw member is attached. By simply screwing into the screw holes, the base element and the jig plate can be fastened very easily and quickly.

  By the way, when various jigs such as clamps and vices fixed to the jig plate are operated using pressure fluid such as hydraulic pressure or air pressure, the pressure fluid is generated from the source that generates the pressure fluid. The supply flow path for supplying the gas is connected to various jigs directly or via a jig plate to which the jigs are fixed. There was a problem.

  That is, when machining a plurality of different types of workpieces, jigs suitable for the respective types of workpieces are required. Therefore, as described above, a jig plate to which a jig operated by a pressure fluid is fixed is used. In this case, the supply flow path is removed from the jig plate that is no longer needed or the jig fixed to it, and then replaced with a new one. It is necessary to perform troublesome work such as reconnecting the supply flow path to the fixed jig plate or the jig fixed to the fixed jig plate, thereby changing the setup by using the characteristic fastening device as described above. Inconveniences such as remarkably impairing the merit of speeding up work and improving workability occurred.

  An apparatus capable of automating the connection / disconnection operation of the supply flow path has been proposed in the past. However, such an apparatus is specially used for a hydraulic cylinder or the like in order to move the supply flow path. Since it has an expensive structure using a simple device, it is inevitable that extra cost is required in connection / disconnection of the supply flow path.

JP-A-8-170607

  Here, the present invention has been made in the background as described above, and the problem to be solved is that the two members to be fastened can be fastened easily and quickly. Fastening with a novel structure that allows connection / disconnection of the supply flow path of the operating pressure fluid to / from a jig fixed to one of the two members without any loss. To provide an apparatus.

  And in this invention, in order to solve this subject, the place which makes it the 1st aspect is a fastening bush attached to position fixing with respect to a 1st member, an opening in a front end surface, and a shaft. A pin main body portion provided with an internal space extending inward in the direction, and the pin main body portion can be inserted into the fastening bush attached to the first member and fitted therein. A fastening pin that is fixedly fixed to the second member to be fastened to the first member, and is movable in a direction perpendicular to the axial direction in the pin body portion of the fastening pin. The first moving means arranged and the first moving means are inserted into the internal space provided in the pin main body portion of the fastening pin so as to be movable in the axial direction, and moved in one axial direction. In a direction perpendicular to the axial direction A second moving means that is moved by pressing and projecting from the outer peripheral surface of the fastening pin, an operating mechanism that moves the second moving means in the axial direction by an external operation, and The pin body portion of the fastening pin is provided on the inner peripheral surface of the portion into which the pin body portion is inserted and fitted, and is protruded from the outer peripheral surface of the pin main body portion while being inserted into the fastening bush. A detachment preventing engaging portion that engages with the first moving means and prevents the fastening bush from moving in a direction of detaching the pin body from the fastening bush. Fastening configured so that fastening of the first member and the second member can be realized by engagement of the disengagement prevention engaging portion and the first moving means in a state of being inserted into the bush. In the device, the fastening The outer surface of the bush protrudes in a direction perpendicular to the axial direction, one surface in the axial direction is a contact surface that contacts the first member, and the other surface in the axial direction is in contact with the axial direction. A first outward flange portion, which is a first alignment surface that extends in a direction perpendicular to the right angle, is provided integrally with the fastening bush, and is perpendicular to the axial direction from the outer peripheral surface of the pin body portion of the fastening pin. A second alignment surface that protrudes in one direction, has one surface in the axial direction abutting against the second member, and the other surface in the axial direction extends in a direction perpendicular to the axial direction The first outward flange portion and the second outward flange portion are provided integrally with the pin body portion, and the pin body portion is inserted into the fastening bush. Are brought into contact with each other at the first and second alignment surfaces. By configuring so that the axial positioning of the fastening pin and the fastening bush can be performed, the first outward flange portion has an opening that opens at the first alignment surface, While providing a first flow path through which a predetermined pressure fluid can flow, the second outward flange portion has an opening that opens at the second alignment surface, so that the predetermined pressure fluid is inside. And the first alignment surface side opening of the first flow channel and the second alignment surface side opening of the second flow channel are arranged in the first outward direction. The first alignment surface and the second alignment surface are provided at mutually corresponding portions so that they can communicate with each other under the contact state between the flange portion and the second outward flange portion. In the at least one of the path and the second flow path. And an opening on the opposite side to the opening on the second alignment surface side is provided so as to be opened at the contact surface, and the first outward flange portion and the second outward flange portion are When contacted, the first alignment surface side opening of the first flow channel and the second alignment surface side opening of the second flow channel are opened, respectively, and the first flow channel and the second flow channel are opened. Although the flow path communicates with each other, the first alignment surface side opening and the second alignment surface side are not in contact with the first outward flange portion and the second outward flange portion. An opening / closing mechanism is provided in each of the first flow path and the second flow path to close the openings and prevent the communication between the first flow path and the second flow path. In the fastening device.

  In the second preferred embodiment of the fastening device according to the present invention, the opening / closing mechanism provided in the first flow path has (a) a cylindrical shape and is disposed in the first flow path. The opening on one side in the axial direction of the inner hole constitutes the first alignment surface side opening of the first flow path, and the inner peripheral surface of the first alignment surface side opening extends to the outside. A taper-shaped inner peripheral surface that gradually increases in diameter toward the opening direction, and further, a projecting position for projecting the end on the opening side to the outside from the first flow path and a lead-in for retracting into the first flow path And (b) a shaft-like member that is fixedly inserted into the inner hole of the movable cylinder, and has an outer peripheral surface and an inner periphery of the inner hole. A flow path for the pressure fluid that is allowed to flow in the first flow path between the first flow path and the surface. The outer peripheral surface of the tip portion corresponding to the first alignment surface side opening in the cylindrical body is a tapered outer peripheral surface composed of a tapered cylindrical surface corresponding to the inner peripheral surface of the first alignment surface side opening. When the movable cylinder is positioned at the protruding position, the tapered outer peripheral surface is brought into contact with the tapered inner peripheral surface of the first alignment side opening to close the opening. On the other hand, when the movable cylinder is moved from the protruding position to the retracted position side, a gap is formed between the tapered outer peripheral surface and the tapered inner peripheral surface of the first alignment surface side opening. A fixed shaft body that opens the opening, and (c) the first flow path so as to exert a biasing force that biases the movable cylinder from the retracted position side toward the projecting position side. Biasing means disposed within the first outward flag. Under the non-contact state between the flange portion and the second outward flange portion, the movable cylinder is maintained at the protruding position based on the urging force of the urging means, and the movable cylinder The tapered inner peripheral surface is brought into contact with the tapered outer peripheral surface of the fixed shaft body in a pressed state, while under the contact state between the first outward flange portion and the second outward flange. The movable cylinder is configured to be positioned at the retracted position against the urging force of the urging means.

  Furthermore, in an advantageous third aspect of the fastening device according to the present invention, the opening / closing mechanism provided in the second flow path has (a) a cylindrical shape and is disposed in the second flow path, The opening on one side in the axial direction of the inner hole constitutes the second alignment surface side opening of the second flow path, and the inner peripheral surface of the second alignment surface side opening is exposed to the outside. A tapered inner peripheral surface that gradually increases in diameter toward the opening direction, and further, a projecting position for projecting the end on the opening side to the outside from the second channel and the second channel. And (b) a shaft-like member inserted in a fixed position in the inner hole of the movable cylinder, the outer peripheral surface of the movable cylinder and the inner hole A flow path for the pressure fluid that is allowed to flow through the second flow path between the inner peripheral surface and the front of the movable cylinder; The outer peripheral surface of the tip portion corresponding to the second alignment surface side opening is a tapered outer peripheral surface made of a tapered cylindrical surface corresponding to the inner peripheral surface of the second alignment surface side opening, and the movement When the cylindrical body is positioned at the protruding position, the tapered outer peripheral surface is brought into contact with the tapered inner peripheral surface of the second alignment side opening to close the opening, When the movable cylinder is moved from the protruding position to the retracted position side, a gap is formed between the tapered outer peripheral surface and the tapered inner peripheral surface of the second alignment surface side opening. A fixed shaft body that opens the opening, and (c) is disposed in the second flow path so as to exert a biasing force that biases the movable cylinder body from the retracted position side toward the projecting position side. Biasing means provided, the first outward flange portion and the second Under the non-contact state with the direction flange portion, based on the biasing force of the biasing means, the movable cylinder is maintained at the protruding position, and the tapered inner peripheral surface of the movable cylinder is While being brought into contact with the tapered outer peripheral surface of the fixed shaft body in a pressed state, the biasing means is applied in a contact state between the first outward flange portion and the second outward flange portion. The moving cylinder is configured to be positioned at the retracted position against the force.

  That is, in the fastening device according to the present invention, the pin body portion of the fastening pin attached to the second member is inserted into the fastening bush attached to the first member, and is integrally formed with the fastening bush. In a state where the first outward flange portion and the second outward flange portion integrally formed with the pin body portion are brought into contact with each other on the first alignment surface and the second alignment surface, By operating the operating mechanism from the outside, the second moving means is moved in one of the axial directions, and the first moving means is projected from the outer peripheral surface of the fastening pin, thereby disengaging the first moving means. The first member and the second member can be securely fastened at a predetermined position in the axial direction of the fastening pin and the fastening bush only by engaging with the joint portion.

  Then, by fastening the first member and the second member under the contact state of the first and second outward flange portions, the first flow path provided in the first outward flange portion and the second The second flow path provided in the two outward flange portions is in communication with each other, so that the predetermined pressure fluid is supplied to the first alignment surface side opening of the first flow path and the second alignment of the second flow path. Through the surface-side opening, the first and second flow paths can be circulated with each other, and such pressure fluid flows in the first outward direction in either the first flow path or the second flow path. It is discharged to the outside through an opening that opens at the contact surface with the flange portion or the second outward flange portion. Further, by removing the pin main body portion from the fastening bush and eliminating the fastening between the first member and the second member, the first alignment surface side opening of the first flow path and the second flow path and the first flow path The two alignment surface side openings are closed, so that the flow of the pressure fluid between the first flow path and the second flow path is blocked.

  For this reason, in this fastening device, for example, both the first flow path and the second flow path are respectively the first member and the second member of the first outward flange portion and the second outward flange portion. When configured to have an opening that opens on the abutment surface, the first member and the second member provided with through holes penetrating in the axial direction of the fastening bush and the fastening pin, respectively, The opening on the second member side or the first member side of each through hole is connected to the contact surface side opening of the first flow path and the second flow path, and the fastening bush and the fastening pin are connected to the first passage. If the position is fixed to the member and the second member, the pin body portion of the fastening pin is inserted into the fastening bush, and the above-described operation for fastening the first member and the second member is performed. , Through hole of first member, first channel, second channel, and second member Are connected to each other and open on the surface of the first member on the side opposite to the second member and on the surface of the second member on the side opposite to the first member, respectively. A communication path is formed. Moreover, such a communicating path can be interrupted | blocked in a 1st flow path and a 2nd flow path only by performing operation which cancels | fastens the fastening of a 1st member and a 2nd member, respectively.

  Therefore, if such a fastening device according to the present invention is used, for example, a jig that is actuated by a pressure fluid such as hydraulic pressure or pneumatic pressure on the surface of the first member opposite to the second member side. Is connected to the opening of the through hole of the second member on the side opposite to the first member side, when the pressure fluid is fixed to the first member. At the same time as the first member and the second member are fastened, it is possible to supply the pressure fluid from the supply flow path into the communication path, and the pressure fluid is allowed to flow through the communication path. And it will be able to be guided and fixed to the 1st member from the opening part on the opposite side to the 2nd member side in the penetration hole of the 1st member. In addition, the flow of the pressure fluid in the communication path is automatically shut off by releasing the fastening between the first member and the second member, so that the pressure fluid flows in the first flow path or the second flow path. It is possible to prevent leakage from the two flow paths to the outside through the first alignment surface side opening and the second alignment surface side opening.

  In addition, in the fastening device, for example, when the jig is fixed to the first member as described above, the supply flow path for supplying the operating pressure fluid to the jig is the jig. Since it is connected to the second member that is not fixed, even if the first member is replaced with another member, there is no need to reconnect the supply flow path, and therefore When replacing the first member to which the tool is fixed, there is no need for a special device for reconnecting the supply flow path as conventionally used, and the installation cost of such a special device is reduced. It can be effectively reduced.

  Further, in the fastening device according to the present invention, for example, when the jig is fixed to the first member, the supply of the pressure fluid to the jig is performed by the first outward flange portion and the second outward direction. The first and second flow paths provided in the flange portion and the opening and closing mechanism are realized in a simple structure, and such a first outward flange portion and a second outward flange portion are It is provided for positioning the fastening pin and the fastening bush, and is not specially added with an extra part for installing the first and second flow paths and the opening / closing mechanism. An increase in manufacturing cost and an increase in the size of the apparatus due to the complexity can be suppressed as much as possible.

  Therefore, according to the fastening device according to the present invention as described above, the feature that allows the two members to be fastened to be fastened easily and quickly is fixed to one of the two members without any loss. The connection / disconnection of the working pressure fluid flow path to the jig or the like can be carried out extremely economically advantageously.

  Further, according to the second and third aspects of the fastening device according to the present invention, the communication state between the first flow path and the second flow path and the cancellation of the communication state can be achieved with an extremely short movement stroke of the movable cylinder. It can be realized with certainty.

  Hereinafter, in order to clarify the present invention more specifically, a specific configuration of a fastening device according to the present invention will be described in detail with reference to the drawings.

  First, FIG. 1 schematically shows an example of a fastening device having a structure according to the present invention and used to fasten a base element and a jig plate attached to a table of a machine tool such as a machining center. It is shown. As is clear from FIG. 1, the fastening device includes a fastening bush 10 and a fastening pin 12. Then, the fastening bush 10 is fixed to the jig plate 14 positioned on the upper side of the jig plate 14 as the first member and the base element 16 as the second member, which are opposed to each other vertically. The fastening pin 12 is fixedly attached to the base element 16 which is attached and located below. In general, a plurality of fastening devices including the fastening bushes 10 and the fastening pins 12 are used, such as being arranged at the four corners between the jig plate 14 and the base element 16. Will be.

  More specifically, the fastening pin 12 constituting the fastening device has a pin main body portion 13 having a substantially stepped columnar shape with the lower part having a larger diameter than the upper part as a whole. The lower outer peripheral surface of the small-diameter upper portion of the pin main body portion 13 of the fastening pin 12 is a pin-side taper fitting portion 22 having a tapered surface shape that gradually increases in diameter toward the lower side. On the upper outer peripheral surface of the lower portion of the diameter, the pin side outwards as a second outward flange portion extending a predetermined length outward in a direction perpendicular to the axial direction and continuously extending in the circumferential direction The flange portion 24 is provided integrally. In the pin-side outward flange portion 24, the upper surface and the lower surface are both horizontal annular surfaces, and the upper surface is a pin-side annular contact surface 26, while the lower surface Is configured as a pin side alignment surface 28 as a second alignment surface.

  In addition, a large-diameter circular hole 30 that provides an internal space in the inner space extends through the pin body portion 13 in the axial direction at the center of the pin body portion 13 of such a fastening pin 12, both vertically. It is provided in the form of a through hole that opens toward the front. And this circular hole 30 has a stepped structure comprised here from the small diameter part located in the upper opening part side, and the large diameter part located in the lower opening part side. Further, the peripheral wall portion of the small diameter portion located on the upper opening side of the circular hole 30 extends in a direction perpendicular to the axial direction of the fastening pin 12 (pin main body portion 13), and the circular hole 30 A plurality of (here, three) circular through holes 32 that penetrate the peripheral wall portion in the thickness direction and open laterally on the outer peripheral surface are formed at equal intervals in the peripheral direction.

  In each circular through hole 32, a steel ball (steel ball) 34 as a first moving means having an outer diameter smaller than the predetermined dimension is placed in the circular through hole 32. These are arranged one by one so as to be movable in the direction perpendicular to the axial direction of the fastening pin 12 (pin main body portion 13), that is, in the radial direction of the fastening pin 12, which is the extending direction.

  Further, a piston member 36 as a second moving means extending in the vertical direction across the small diameter portion and the large diameter portion is inserted into the circular hole 30 of the pin main body portion 13 so as to be slidable in the vertical direction. Has been placed. In the piston portion 36, a circumferential groove 38 having a predetermined depth is provided on the upper outer peripheral surface, and a flange portion 39 having an L-shaped longitudinal section is integrally provided on the outer peripheral surface of the lower end. Has been. Further, the circumferential groove 38 provided on the upper outer peripheral surface of the piston member 36 has a tapered shape composed of a tapered cylindrical surface in which the upper side surface of the two side surfaces opposed in the vertical direction gradually increases in diameter upward. On the other hand, the lower side surface is a tapered cylindrical surface 42 that gradually becomes smaller in diameter toward the upper side. The piston member 36 is positioned on the tapered pressing surface 40 so as to be able to come into contact with the steel balls 34 respectively disposed in the circular through holes 32, and a flange portion 39. Thus, by closing the lower opening of the circular hole 30, the first liquid chamber 43 is formed in the large diameter part of the circular hole 30.

  Here, a plurality of disc springs 44 are overlapped with each other inside the first liquid chamber 43 provided in the large-diameter portion of the circular hole 30 and are located at the uppermost and lowermost stages. The hole 30 is accommodated and disposed in a state of being engaged with the stepped surface for stepping the small diameter portion and the large diameter portion of the hole 30 and the upper surface of the flange portion 39 of the piston member 36. The piston member 36 is urged upward by the plurality of disc springs 44 under the non-fastened state between the fastening pin 12 and the fastening bush 10, thereby the steel ball 34. However, it is sandwiched between the tapered cylindrical surface 42 of the piston member 36 and the side surface of each circular through-hole 32, so that unnecessary movement of the steel ball 34 can be prevented. In FIG. 1, reference numeral 46 denotes a regulating ring that regulates the amount of upward movement of the piston member 36 by a predetermined amount.

  Then, such a fastening pin 12 is configured such that the pin-side annular contact surface 26 of the pin-side outward flange portion 24 in the pin main body portion 13 is formed in the opening portion of the accommodation recess 48 provided on the upper surface of the base element 16. A second liquid chamber formed in a predetermined space between the lower portion of the receiving recess 48 and the bottom portion of the receiving recess 48 in contact with the peripheral portion and in the receiving recess 48 between the lower side portion of the pin side outward flange portion 24. In a state of being accommodated so as to form 50, it is fixed to the base element 16 by being fixed with bolts or the like.

  Further, here, in the base element 16, two locations where the pin-side outward flange portion 24 (pin-side annular contact surface 26) of each fastening pin 12 abuts and one bottom portion of each accommodation recess 48. Pressure oil passages 52a to 52c extending through these portions in the vertical direction are provided at the respective locations. Each of the pressure oil passages 52a to 52c has a predetermined oil pressure generation source (not shown), and supplies a pressure oil from the oil pressure generation source, and extends from a pressure oil supply device as an operation mechanism. 49a-c are connected, and pressure oil can be supplied in each pressure oil flow path 52a-c.

  Thus, as shown in FIGS. 1 and 2, one pressure oil passage 52a of the two pressure oil passages 52a and 52b provided at the contact portion of the base element 16 with the pin-side outward flange portion 24 is provided. The pressure liquid supplied from the supply flow path 49a to the first liquid chamber 43 through the flow path 47 provided in the pin main body 13 so that the pressure oil flow path 52a communicates with the first liquid chamber 43. The piston member 36 is allowed to move downward by being introduced into the interior of the cylinder, and the pressure oil passage provided at the bottom of the housing recess 48 in the base element 16 from the supply passage 49c. The pressure oil supplied to 52c is introduced into the second liquid chamber 50 formed between the bottom surface of the housing recess 48 and the pin main body portion 13 through the pressure oil passage 52c, whereby the piston Material 36 is adapted to be moved upward.

  In particular, when the piston member 36 is moved downward, the steel ball 34 in each circular through hole 32 is accompanied by the taper-shaped pressing surface 40 of the pin main body 13 with the pin main body 13. Is pressed outward in the radial direction, and the inside of each circular through hole 32 is moved toward the outer peripheral surface side opening of the pin main body portion 13 in the circular through hole 32. 1 and 2, reference numeral 51 denotes an O-ring that seals the first liquid chamber 43 and the second liquid chamber 50, respectively.

  On the other hand, as is clear from FIG. 1, the fastening bush 10 that constitutes the fastening device together with the fastening pin 12 has an inner diameter that is larger by a predetermined dimension than the outer diameter of the pin body portion 13 of the fastening pin 12. A bush main body 53 having a cylindrical shape and a lid 54 that covers and covers the upper opening of the bush main body 53 are integrated by screwing or the like. And the inner side protrusion 55 which protrudes in the inner peripheral surface of the axial direction intermediate part of the bush main-body part 53 in this fastening bush 10 at predetermined low height toward radial inner direction, and is extended continuously in the circumferential direction. However, on the outer peripheral surface of the lower end portion, the bush side as the first outward flange portion projecting at a predetermined height radially outward and continuously extending in the circumferential direction. An outward flange portion 56 is integrally provided. Further, in the bush side outward flange portion 56, the upper surface and the lower surface are both horizontal annular surfaces, and the upper surface is the bush side annular contact surface 58, while the lower surface is The bush-side alignment surface 60 is a first alignment surface.

  Furthermore, in such a fastening bush 10, the inner diameter of the inner protrusion 55 provided on the inner peripheral surface of the bush body 53 is a pin on the upper side of the pin-side taper fitting portion 22 of the fastening pin 12. As a detachment prevention engaging portion, the main body portion 13 portion is configured to be a size that can be inserted, and the upper side surface of the inner protrusion 55 has a tapered surface shape that gradually decreases in diameter toward the lower side. It is set as the taper-shaped engagement surface 62 of this. Furthermore, the inner peripheral surface of the lower portion of the bushing body portion 53 from the portion where the inner protrusion 55 is formed corresponds to the tapered surface shape of the pin-side taper fitting portion 22 of the fastening pin 12 and gradually increases toward the lower side. The bush side taper fitting portion 64 has a tapered surface shape with a diameter.

  Such a fastening bush 10 contacts the bush-side annular contact surface 58 of the bush-side outward flange portion 56 with the peripheral portion of the opening of the receiving recess 66 provided on the lower surface of the jig plate 14. It is attached to the jig plate 14 in a fixed manner, for example, by being bolted in a state where the upper side portion of the bushing-side outward flange portion 56 is housed in the housing recess 66. It has been.

  Further, here, the pin-side outward flange in the base element 16 at the contact portion of the jig plate 14 with the bush-side outward flange portion 56 (bush-side annular contact surface 58) of the fastening bush 10. A pressure oil passage 68 extending through the portion in the vertical direction is provided at a portion corresponding to the formation portion of the pressure oil passage 52b that does not communicate with the first liquid chamber 43 of the portion 24. A clamp 69 that is actuated by introduction of pressure oil from the pressure oil passage 68 is fixed to the upper surface of the formation site of the pressure oil passage 68.

  Thus, in this embodiment, as shown in FIG. 2, the upper portion of the pin body portion 13 of the fastening pin 12 than the pin-side outward flange portion 24 is inserted into the inner hole of the fastening bush 10. Under the state, the pin side outward flange portion 24 of the pin body portion 13 and the bush side outward flange portion 56 of the fastening bush 10 are brought into contact with each other at the pin side alignment surface 28 and the bush side alignment surface 60. By being brought into contact with each other, further insertion of the fastening pin 12 into the fastening bush is restricted, and the axial alignment (vertical direction) between the fastening pin 12 and the fastening bush 10 can be performed. . At that time, the bushing-side taper fitting portion 64 of the fastening bush 10 and the pin-side taper fitting portion 22 of the fastening pin 12 are taper-fitted, whereby the axial direction of the fastening pin 12 and the fastening bush 10 is determined. Alignment in a direction perpendicular to can also be performed.

  Then, under the alignment state of the fastening pin 12 inserted into the fastening bush 10 as described above, the pressure oil supplied from the pressure oil supply device (not shown) is put into the circular hole 30 of the fastening pin 12 as described above. By being introduced into the provided first liquid chamber 43, the steel ball 34 in each circular through hole 32 is moved in accordance with the downward movement of the piston member 36 inserted and disposed in the circular hole 30. Is moved toward the outer peripheral surface side opening of the pin main body 13 in the circular through-hole 32. Each steel ball 34 is partially protruded laterally from the outer peripheral surface of the pin main body 13, and the protruding portion of each steel ball 34 to the side is a tapered engagement of the fastening bush 10. Engaged with surface 62. As a result, the fastening pin 12 and the fastening bush 10 are fastened, so that the base element 16 and the jig plate 14 to which they are fixedly attached can be fastened.

  Further, from such a state, the pressure oil supplied from a pressure oil supply device (not shown) is introduced into the second liquid chamber 50 in the housing recess 48 in the base element 16, and the piston member 36 is moved upward. As a result, the steel balls 34 partially protruded laterally from the outer peripheral surface of the pin main body 13 are drawn into the circular through holes 32, and the steel balls 34 and the fastening bushes are connected. The engagement with the 10 tapered engagement surfaces 62 is released. As a result, the fastening state between the fastening pin 12 and the fastening bush 10 and the fastening state between the base element 16 and the jig plate 14 can be released.

  By the way, in the fastening device of the present embodiment having such a structure, as shown in FIGS. 3 and 4, in particular, the bush-side outward flange portion 56 of the fastening bush 10 and the pin of the fastening pin 12 are used. A bush-side flow path 70 as a first flow path and a pin-side flow path 72 as a second flow path extending through the side outward flange portion 24 in the vertical direction (axial direction), respectively, Each is provided.

  More specifically, of the pin side flow path and the bush side 72, 70, the pin side flow path 72 is provided with a step surface 74 formed of an annular surface at the intermediate portion in the extending direction thereof, whereby the base element The portion on the 16 side is the small diameter portion 76, while the portion on the opposite side is the large diameter portion 78, and has a substantially stepped through hole configuration. Further, in such a pin-side flow path 72, the downward opening portion of the small-diameter portion 76 has a contact surface-side opening portion 77 that opens at the pin-side annular contact surface 26 of the pin-side outward flange portion 24. On the other hand, the upper opening portion of the large-diameter portion 78 opens at the pin-side alignment surface 28 of the pin-side outward flange portion 24, and the alignment surface-side opening as the second alignment surface-side opening portion. Part 79 is designated. Of these two openings 77, 79, the contact surface side opening 77 is formed in the base element 16 and is different from the pressure oil passage 52 a communicating with the first liquid chamber 43. The pressure oil supplied to the pressure oil flow path 52b is allowed to flow into the pin side flow path 72 through the contact surface side opening 77. ing.

  On the other hand, the bush-side flow path 70 is also provided with a stepped surface 80 made of an annular surface at the intermediate portion in the extending direction, like the pin-side flow path 72, and the portion on the jig plate 14 side is connected to the small diameter portion 82. On the other hand, the portion on the opposite side has a substantially stepped through-hole configuration having a large diameter portion 84. Further, in such a bush side channel 70, the first alignment surface side opening portion in which the downward opening portion of the large diameter portion 84 opens at the bush side alignment surface 60 of the bush side outward flange portion 56. The contact surface side opening 85 has an opening on the bushing-side annular contact surface 58 of the bushing-side outward flange portion 56, while the small-diameter portion upward opening 85 is an alignment surface-side opening 85. 83. Further, of the two openings 85, 83, the contact surface side opening 83 is formed in the jig plate 14 so as to correspond to the pressure oil passage 52 b in the base element 16. On the other hand, the alignment surface side opening 85 is communicated with the channel 68, and the alignment of the pin side flow path 72 is performed under the contact state between the pin side outward flange portion 24 and the bush side outward flange portion 56. It can be positioned corresponding to the surface side opening 79. 3 and 4, reference numeral 81 denotes an O-ring for preventing pressure oil leakage at the contact surface side openings 77 and 83 in each of the pin side channel 72 and the bush side channel 70.

  In this case, the pin-side opening / closing mechanism 86 and the bush-side opening / closing mechanism 88 are accommodated in the pin-side and bush-side flow paths 72, 70, respectively. The pin-side flow path 72 and the bush-side flow path 70 are aligned with the openings 79 and 85 of the pin-side flow path 72 and the bush-side flow path 70 in a corresponding position under the contact state between the pin-side outward flange 24 and the bush-side outward flange 56. Communication / blocking can be switched.

  That is, as apparent from FIGS. 3 and 4, the pin side opening / closing mechanism 86 and the bush side opening / closing mechanism 88 are respectively composed of a movable cylinder 90, a compression coil spring 92 as an urging means, and a fixed shaft 94. The movable cylinder 90 constituting the pin-side opening / closing mechanism 86 has an outer diameter slightly smaller than the inner diameter of the large-diameter portion 78 of the pin-side flow path 72, and a pin-side flow. A substantially thick cylindrical shape having an inner diameter that is larger than the inner diameter of the small diameter portion 76 of the path 72 and a height (length) that is the same as or shorter than the depth of the large diameter portion 78; Inside the large-diameter portion 78 of the pin-side channel 72, the inner hole is accommodated so as to be slidable in the vertical direction in a state where the inner hole communicates with the small-diameter portion 76. As a result, the moving cylinder 90 narrows the upper opening of the large diameter portion 78 in the pin-side flow path 72 by the thickness thereof, so that it substantially becomes the upper opening of the inner hole. Thus, the alignment surface side opening 79 of the pin side flow path 72 is formed.

  Further, in such a moving cylinder 90, the inner peripheral surface of the upper side opening that gives the alignment surface side opening 79 of the pin side flow path 72 has a tapered shape in which the diameter gradually increases upward. Further, an annular groove 98 having a predetermined depth is provided on the lower surface facing the step surface 80 in the large-diameter portion 78 of the pin-side flow path 72. Further, an O-ring 100 is extrapolated to the outer peripheral surface of the movable cylinder 90, and an O-ring 102 is mounted on the upper surface so as to surround the tapered inner peripheral surface 96. The O-ring 104 is also attached to the lower portion of the tapered inner peripheral surface 96 on the inner peripheral surface.

  The compression coil spring 92 is also housed in the large-diameter portion 78 of the pin-side flow path 72 as in the case of the movable cylinder 90. However, the compression coil spring 92 is not compressed. A length dimension larger than the depth dimension of the annular groove 98 provided in the movable cylinder 90 by a predetermined dimension and a diameter that can be accommodated in the annular groove 98 are provided. Then, such a compression coil spring 92 moves in a state where both end portions in the length direction are engaged with the stepped surface 74 of the pin-side flow path 72 and the bottom surface of the annular groove 98 of the movable cylindrical body 90, respectively. The cylindrical body 90 is accommodated in the annular groove 98.

  Accordingly, as is apparent from FIG. 3, when the pin-side outward flange portion 24 of the fastening pin 12 is not brought into contact with the bush-side outward flange portion 56 of the fastening bush 10, The movable cylinder 90 accommodated in the large-diameter portion 78 has an end (upper end) on the upper opening side that provides the alignment surface side opening 79 of the pin-side flow path 72, and a large end of the pin-side flow path 72. It is positioned in a state where it protrudes upward from the diameter portion 78 by a predetermined dimension.

  Further, as shown in FIG. 4, the movable cylinder 90 has a compression coil when the pin side outward flange portion 24 is pressed downward, for example, by being brought into contact with the bush side outward flange portion 56. The whole can be drawn into the large-diameter portion 78 of the pin-side channel 72 against the biasing force of the spring 92.

  On the other hand, as shown in FIG. 3, the fixed shaft 94 has a substantially cylindrical shape having an outer diameter smaller than the inner diameter of the movable cylinder 90 by a predetermined dimension. The outer peripheral surface of the lower end is engraved with a male screw, while the outer peripheral surface of the upper end is a tapered outer peripheral surface 106 made of a tapered cylindrical surface corresponding to the tapered inner peripheral surface 96 of the movable cylindrical body 90. Has been. In addition, a through-hole 108 is formed in the central portion so as to open and extend at the side surface and the lower end surface of the intermediate portion in the axial direction.

  Then, such a fixed shaft 94 is provided on the outer peripheral surface of the lower end portion in a state where the fixed shaft 94 is inserted into the inner hole of the movable cylindrical body 90 accommodated in the large-diameter portion 78 of the pin-side channel 72. The male screw is screwed into a female screw formed on the upper inner peripheral surface of the small-diameter portion 76 of the pin-side flow path 72, thereby fixing the position, and moving with the outer peripheral surface of such a fixed shaft 94. A flow passage for pressure oil is formed between the inner peripheral surface of the cylindrical body 90.

  Further, in the fixed shaft 94 that is inserted into the inner hole of the movable cylinder 90 and is housed in the pin-side channel 72 so as to be fixed in position, as shown in FIGS. The tapered outer peripheral surface 106 is brought into contact with the tapered inner peripheral surface 96 of the movable cylindrical body 90 in a state where the upper end portion of the 90 protrudes upward from the large diameter portion 78 of the pin-side channel 72. On the other hand, in a state where the entire moving cylinder 90 is drawn into the large diameter portion 78 of the pin-side flow path 72, the tapered outer peripheral surface 106 and the tapered inner peripheral surface 96 of the moving cylinder 90 are An annular gap is formed between them.

  Thus, here, when the movable cylinder 90 is positioned so that the upper end of the movable cylinder 90 protrudes upward from the large-diameter portion 78 of the pin-side flow path 72, The positioning surface side opening 79 of the pin side flow path 72 provided is closed, so that the pin side flow path 52b of the pin side outward flange portion 24 passes through the contact surface side opening 77. The pressure oil that has flowed into 72 is prevented from flowing out from the pin-side flow path 72. On the other hand, when the movable cylinder 90 is positioned with the entirety thereof drawn into the large-diameter portion 78 of the pin-side channel 72, the alignment surface-side opening 79 is opened, and thus the pin-side flow The pressure oil in the passage 72 can be discharged to the outside through the alignment surface side opening 79.

  On the other hand, the bush side opening / closing mechanism 88 is disposed in the bush side flow path 70 in a state where it is inverted in the vertical direction with respect to the pin side opening / closing mechanism 86 as described above and as is apparent from FIGS. When the pin-side outward flange portion 24 and the bush-side outward flange portion 56 are not in contact with each other, the movable cylinder 90 is predetermined downward from the large-diameter portion 84 of the bush-side flow passage 70. The structure is the same as that of the pin-side opening / closing mechanism 86, except that the protrusion is positioned by the dimension.

  Thereby, in the bush side channel 70, when the movable cylinder 90 of the bush side opening / closing mechanism 88 is positioned with its lower end protruding downward from the large diameter portion 84 of the bush side channel 70, The alignment surface side opening 85 of the bush side flow path 70 provided at the lower opening of the inner hole of the movable cylinder 90 is closed so that the flow of pressure oil through the opening 85 is prevented. In addition, when the entire moving cylinder 90 is positioned by being drawn into the large-diameter portion 84 of the bush side flow path 70, the alignment surface side opening 85 is opened, and this is applied. Inflow of pressure oil through the opening 85 is allowed.

  Thus, as shown in FIGS. 1 and 3, when the fastening pin 12 and the fastening bush 10 are not fastened and the base element 16 and the jig plate 14 are not fastened, the pin side The alignment surface side openings 79 and 85 of the flow path 72 and the bush side flow path 70 are closed by the pin side and bush side opening / closing mechanisms 86 and 88, respectively, so that the pressure oil flow path of the base element 16 is closed. The pressure oil supplied into the pin side flow path 72 through 52b and the pressure oil in the clamp 69 fixed to the jig plate 14 and the pressure oil flow path 68 of the jig plate 14 are aligned with each other. It is possible to reliably prevent leakage through the side openings 79 and 85 to the outside.

  2 and 4, the fastening pin 12 and the fastening bush 10 are fastened, and the base element 16 and the jig plate 14 are fastened, whereby the pin-side opening / closing mechanism 86 and the bushing side are fastened. The movable cylinders 90 and 90 in the opening / closing mechanism 88 are in contact with each other, and each of the movable cylinders 90 resists the urging force of each compression coil spring 92 and is in the pin side and bush side flow paths 72 and 70, respectively. Thus, the positioning surface side openings 79 and 85 of the pin side flow path 72 and the bush side flow path 70 are opened. As a result, the pressure oil flow path 52b of the base element 16, the pin side flow path 72, the bush side flow path 70, and the pressure oil flow path 68 of the jig plate 14 are communicated with each other. 52b, 72, 70, and 68 form a continuous communication passage through which pressure oil can flow, so that the pressure oil supplied from a pressure oil supply device (not shown) is controlled through the continuous communication passage. It can be guided to a clamp 69 fixed on the tool plate 14.

  As described above, in the fastening device of the present embodiment, the jig plate 14 is simply operated by fastening the fastening pin 12 and the fastening bush 10 and fastening the base element 16 and the jig plate 14. It is possible to supply the pressure oil to the clamp 69 fixed to the clamp 69, and by eliminating the fastening state of the fastening pin 12 with the fastening bush 10, the pressure oil supply passages 52b, 72, 70, 68 are provided. The supply of pressure oil to the clamp 69 can be stopped in a state where leakage from the middle is prevented.

  Therefore, in the fastening device according to this embodiment as described above, the base element 16 and the jig plate 14 can be fastened and easily fastened, and are fixed to the jig plate 14. Connection / disconnection of the operating pressure oil supply flow path to the clamp 69 is also performed very easily and speedily without any extra operation other than the fastening operation between the base element 16 and the jig plate 14. It can be done.

  In addition, in such a fastening device, the supply flow path 49b for supplying the pressure oil for operating the clamp 69 from the pressure oil supply apparatus is connected to the pressure oil flow path 52b provided in the base element 16, for example. Even when the jig plate 14 is replaced with another one for the replacement of the setup, there is no need to reconnect the supply flow path 49b. Unlike the case of using a conventional fastening device configured to be connected to the jig plate 14, a special device such as that used for reconnecting the supply flow path 49b is not required at all. The installation cost of a simple device can be effectively reduced.

  Therefore, if such a fastening device of this embodiment is used, the connection / removal operation of the hydraulic oil supply flow path 49b for operation with respect to the clamp 69 etc. fixed to the jig plate 14 is economically advantageous. Can be implemented.

  Further, in such a fastening device, the pin-side outward flange portion 24 of the fastening pin 12 and the bush-side outward flange portion 56 of the fastening bush 10 that are provided to align the fastening pin 12 and the fastening bush 10 in the vertical direction. In contrast, the pin-side and bush-side flow paths 72 and 70 partially constituting the communication path for guiding the pressure oil for operation to the clamp 69 fixed to the jig plate 14, the pin side and Pin-side and bush-side opening / closing mechanisms 86 and 88 that allow / block pressure oil flow in the bush-side flow paths 72 and 70 are provided. The pin-side and bush-side flow paths 72 and 70 and the pin-side and Since no special parts for installing the bush side opening / closing mechanisms 86 and 88 are provided, the entire apparatus has been enlarged in order to realize the excellent features as described above. It as production costs or rising is also as it can be effectively avoided.

  Further, in the fastening device of the present embodiment, the pin-side and bush-side flow paths can be achieved with a relatively small movement stroke of the movable cylinder 90 that is movably disposed in the pin-side and bush-side flow paths 72 and 70. There is an advantage that the switching of the permissible / blocking of the flow of the pressure oil within 72, 70 can be performed reliably.

  The specific configuration of the present invention has been described in detail above, but it is merely an example, and the present invention is not limited by such description.

  For example, the pin-side opening / closing mechanism 86 and the bush-side opening / closing mechanism 88 do not necessarily have the same structure, and may have different structures.

  As the structure of such opening / closing mechanisms 86 and 88, for example, the movable cylinder 90 is fixed in position, and the fixed shaft 94 is partially above or below the pin side and bush side flow paths 72 and 70. In a state in which the alignment surface side openings 79 and 85 are closed, and are arranged so as to be retractable in the flow paths 72 and 70. A structure in which the alignment surface side openings 79 and 85 can be opened can also be adopted. Furthermore, instead of the opening / closing mechanisms 86 and 88 having the movable cylinder 90 and the fixed shaft 94, a general check valve or the like can be used.

  Furthermore, in the above-described embodiment, the second moving means is constituted by the piston member 36 that is moved up and down by a hydraulic mechanism, and the operation mechanism supplies pressure oil for operating the piston member 36. For example, as disclosed in Japanese Patent Application Laid-Open No. 8-170607, the second moving means is configured with a predetermined screw member, and the operation mechanism is configured with the screw member. It may be configured by a screw mechanism that moves downward or upward along with screwing or screwing (relaxation). In addition, the operation mechanism is appropriately configured with various known structures capable of moving the second moving means in the axial direction.

  In the embodiment, the pin-side flow path 72 provided in the pin-side outward flange portion 24 of the fastening pin 12 includes the alignment surface-side opening 79 and the contact surface-side opening 77, and this The contact surface side opening 77 is provided in the base element 16 and communicates with the pressure oil passage 52b to which the pressure oil supply passage 49b is connected. For example, the pin-side flow path 72 has an outer peripheral surface-side opening that opens on the outer peripheral surface of the pin-side outward flange portion 24, and an alignment surface-side opening 79. The pressure oil supply channel 49b can be directly connected to the outer peripheral surface side opening.

  Further, the fastening pin 12 may be attached to the jig plate 14 in a fixed position, while the fastening bush 10 may be attached to the base element 16 in a fixed position. At this time, the bush side flow path 72 is communicated with the pressure oil flow path 52 b of the base element 16, and the pin side flow path 70 is communicated with the pressure oil flow path 68 of the jig plate 14. Will be.

  Furthermore, in the above-described embodiment, the urging means for urging the movable cylinder 90 is configured by the compression coil springs 92 provided in the pin side and bush side opening / closing mechanisms 86, 88. Needless to say, various means other than the compression coil spring 92 and various urging members other than the spring member can be appropriately employed as means.

  In the above embodiment, the pressure oil is supplied to the clamp 69. However, instead of the pressure oil, compressed air or other pressure fluid may be supplied.

  In addition, in the said embodiment, the specific example of what applied this invention with respect to the fastening device used in order to mutually fasten the base element and jig plate which are attached to the table of machine tools, such as a machining center, is shown. However, the present invention can be advantageously applied to a fastening device used for fastening two various members to be fastened to each other other than the combination of a base element and a jig plate. Of course.

  In addition, although not enumerated one by one, the present invention can be carried out in a mode to which various changes, modifications, improvements, etc. are added based on the knowledge of those skilled in the art. It goes without saying that all are included in the scope of the present invention without departing from the spirit of the present invention.

It is a longitudinal cross-sectional explanatory drawing which shows an example of the fastening apparatus according to this invention in the use condition, Comprising: The fastening pin and the fastening bush have shown the non-fastened state. It is explanatory drawing which shows another use condition of the fastening apparatus shown by FIG. 1, Comprising: The state which fastened the fastening pin and the fastening bush mutually is shown. It is the elements on larger scale in Drawing 1, and shows the state of the pin side and bush side opening-and-closing mechanism under the non-fastening state of a fastening pin and a fastening bush. It is the elements on larger scale in Drawing 2, and shows the state of the pin side and bush side opening-and-closing mechanism under the conclusion state of a conclusion pin and a conclusion bush.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Fastening bush 12 Fastening pin 13 Pin main body part 14 Jig plate 16 Base element 24 Pin side outward flange part 26 Pin side annular contact surface 28 Pin side alignment surface 34 Steel ball 36 Piston member 53 Bush main body part 56 Bushing Outward flange 58 Bush side annular contact surface 60 Bush side alignment surface 70 Bush side flow channel 72 Pin side flow channel 77, 83 Contact surface side opening 79, 85 Alignment surface side opening 86 Pin side opening / closing Mechanism 88 Bush side opening / closing mechanism 90 Moving cylinder 92 Compression coil spring 94 Fixed shaft

Claims (3)

A fastening bush that is fixedly attached to the first member, and a pin main body portion that is provided with an internal space that is open at the front end surface and that extends inward in the axial direction. A fastening pin that is fixedly attached to a second member to be fastened to the first member so that it can be inserted into and fitted into the fastening bush attached to the one member; and the fastening A first moving means disposed in the pin main body of the pin so as to be movable in a direction perpendicular to the axial direction thereof, and an axial direction in the internal space provided in the pin main body of the fastening pin The first moving means is pushed in a direction perpendicular to the axial direction and moved from the outer peripheral surface of the fastening pin by moving in one axial direction. Moving means and the second transfer An operation mechanism for moving the means in the axial direction by an operation from the outside, and an inner peripheral surface of the portion where the pin main body portion of the fastening pin of the fastening bush is inserted and fitted. In a direction in which the main body part is engaged with the first moving means protruded from the outer peripheral surface of the pin main body part in a state where the main body part is inserted into the fastening bush, and the pin main body part is detached from the fastening bush. A disengagement preventing engagement portion for preventing the movement of the fastening bush of the pin, and by engaging the disengagement preventing engagement portion with the first moving means in a state where the pin body portion is inserted into the fastening bush, In the fastening device configured to be able to achieve fastening of the first member and the second member,
Projecting in a direction perpendicular to the axial direction from the outer peripheral surface of the fastening bush, one axial surface is a contact surface that contacts the first member, and the other axial surface is the axial direction. A first outward flange portion that is a first alignment surface that extends in a direction perpendicular to the fastening bush is provided integrally with the fastening bush, while an axial direction extends from the outer peripheral surface of the pin body portion of the fastening pin. A second position where one surface in the axial direction protrudes in a direction perpendicular to the first member and is a contact surface that contacts the second member, and the other surface in the axial direction extends in a direction perpendicular to the axial direction. A second outward flange portion formed as a mating surface is provided integrally with the pin main body portion, and the first outward flange portion and the second outer flange portion are inserted in a state where the pin main body portion is inserted into the fastening bush. The direction flange portion is in contact with the first and second alignment surfaces. By be fit, as well as configured as axial positioning between the fastening pin and the fastening bush can be made,
The first outward flange portion has an opening that opens at the first alignment surface, and a first flow path through which a predetermined pressure fluid can flow is provided, while the second outward flange is provided. Provided with a second flow path having an opening that opens in the second alignment surface and through which the pressure fluid can flow, and the first alignment surface side of the first flow path The opening and the second alignment surface side opening of the second flow path can be communicated with each other under the contact state of the first outward flange portion and the second outward flange portion. The first and second alignment surfaces in at least one of the first flow path and the second flow path are provided at mutually corresponding portions of the first alignment surface and the second alignment surface. An opening on the opposite side of the opening is provided so as to be opened at the contact surface.
Further, when the first outward flange portion and the second outward flange portion are brought into contact with each other, the first alignment surface side opening of the first channel and the second channel of the second channel are arranged. Each of the alignment surface side openings is opened so that the first flow path and the second flow path communicate with each other, but the first outward flange portion and the second outward flange portion are not in contact with each other. Then, the first alignment surface side opening and the second alignment surface side opening are respectively closed, and an open / close mechanism that prevents communication between the first flow path and the second flow path is provided in the first flow path. A fastening device provided in the road and in the second flow path, respectively.   The opening / closing mechanism provided in the first flow path has (a) a cylindrical shape, is disposed in the first flow path, and the opening of one side in the axial direction in the inner hole While constituting the first alignment surface side opening, the inner peripheral surface of the first alignment surface side opening is a tapered inner peripheral surface that gradually increases in diameter toward the opening direction to the outside, And (b) a movable cylinder that is movable between a projecting position for projecting the end on the opening side to the outside from the first channel and a retracted position for retracting the first channel into the first channel. The pressure fluid is made of a shaft-like member inserted in a fixed position in the inner hole of the movable cylinder, and is circulated in the first flow path between the outer peripheral surface and the inner peripheral surface of the inner hole. An outer periphery of a tip portion that forms a flow path and that corresponds to the opening on the first alignment surface side in the movable cylinder Is a tapered outer peripheral surface consisting of a tapered cylindrical surface corresponding to the inner peripheral surface of the first alignment surface side opening, and when the movable cylinder is positioned at the protruding position, the tapered shape When the outer peripheral surface is brought into contact with the tapered inner peripheral surface of the first alignment side opening to close the opening, while the movable cylinder is moved from the protruding position to the retracted position A fixed shaft body that forms a gap between the tapered outer peripheral surface and the tapered inner peripheral surface of the first alignment surface side opening to open the opening; and (c) the movable cylinder. Urging means disposed in the first flow path so as to exert a urging force for urging the retraction position side toward the protruding position side, and the first outward flange portion; In a non-contact state with the second outward flange portion, the biasing means is attached. Based on the force, the movable cylinder is maintained in the protruding position, and the tapered inner peripheral surface of the movable cylinder abuts against the tapered outer peripheral surface of the fixed shaft body in a pressed state. On the other hand, when the first outward flange portion and the second outward flange are in contact with each other, the movable cylinder is positioned at the retracted position against the urging force of the urging means. The fastening device according to claim 1 configured as described above. The opening / closing mechanism provided in the second flow path has (a) a cylindrical shape, is disposed in the second flow path, and the second opening is open at the opening on one side in the axial direction of the inner hole. A tapered inner peripheral surface that forms the second alignment surface side opening of the flow path, and that the inner peripheral surface of the second alignment surface side opening gradually increases in diameter toward the outside opening direction. And a movable cylinder that is movable between a projecting position for projecting the end on the opening side to the outside from the second flow path and a retracted position for retracting the end part into the second flow path. (B) It consists of a shaft-like member that is fixedly inserted into the inner hole of the movable cylinder, and flows through the second flow path between the outer peripheral surface and the inner peripheral surface of the inner hole. An outer periphery of a tip portion that forms a flow path of the pressure fluid to be squeezed and that corresponds to the opening on the second alignment surface side in the movable cylinder Is a tapered outer peripheral surface consisting of a tapered cylindrical surface corresponding to the inner peripheral surface of the second alignment surface side opening, and when the movable cylinder is positioned at the protruding position, the tapered shape When the outer peripheral surface is brought into contact with the tapered inner peripheral surface of the second alignment side opening to close the opening, while the movable cylinder is moved from the protruding position to the retracted position A fixed shaft body that forms a gap between the tapered outer peripheral surface and the tapered inner peripheral surface of the second alignment surface side opening to open the opening; and (c) the movable cylinder Urging means disposed in the second flow path so as to exert a urging force for urging the retraction position side toward the protruding position side, and the first outward flange portion And the second outward flange portion are not in contact with each other. Based on the force, the movable cylinder is maintained in the protruding position, and the tapered inner peripheral surface of the movable cylinder abuts against the tapered outer peripheral surface of the fixed shaft body in a pressed state. On the other hand, when the first outward flange portion and the second outward flange are in contact with each other, the movable cylinder is positioned at the retracted position against the urging force of the urging means. The fastening device according to claim 1 or 2, wherein the fastening device is configured as described above.

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