JP2006038038A - One-operation type joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a one-operation type joint capable of air-tightly connecting a plurality of first tubes and a plurality of second tubes to each other at the same time even in a small working space and capable of easily connecting/disconnecting these tubes in a short time. <P>SOLUTION: The first tubes 50A and 60A are held between semicircular grooves 22B, 23B and semicircular grooves 25B, 26B of a first joint member 20. Second insert holes 32 and 33 of a second joint member 30 are communicated with the second tubes 50B and 60B through connectors 56 and 57. Furthermore, the first tubes 50A and 60A are inserted into the insert holes 32 and 33 through guide parts 41A and 42A of a presser plate 40. The first joint member 20, the second joint member 30 and the presser plate 40 are integrally fixed to each other through a fixing screw 51 to air-tightly connect the first tubes 50A and 60A to the second tubes 50A and 60B. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates generally to a one-touch joint used when preparing a medicine or the like, and more particularly to a one-touch joint suitable for connecting a tube (pipe) used in an automatic radiopharmaceutical synthesizer.

Conventionally, in the fields of medicine, pharmacy, biochemistry, and the like, PET (Positron Emission Computed Tomography) apparatuses are useful as means for obtaining quantitative physiological images of biological functions. In particular, the PET apparatus exhibits great power in the diagnosis and research of cancer diagnosis, Alzheimer's disease, manic depression, schizophrenia and the like. This instrument is radioactively labeled with ultrashort half-life nuclides such as ¹¹ C (half-life 20 minutes), ¹³ N (half-life 10 minutes), ¹⁵ O (half-life 2 minutes), ¹⁸ F (half-life 110 minutes), etc. A drug is injected intravenously, and its in vivo dynamics are noninvasively measured using a PET camera.

  However, many difficulties need to be overcome to prepare these radiopharmaceuticals. That is, for example, these drugs release very strong radioactivity and need to be synthesized automatically in a hot cell surrounded by lead. Otherwise, there is a risk that the worker will be exposed to a large amount of radiation. In addition, since these drugs are finally administered to the human body, it is very important to ensure the safety of the drugs. Moreover, since these drugs have an ultra-short half-life, many processes such as the production of radionuclides, the production of labeled compounds by multi-step chemical reactions, separation and purification, and dispensing treatments can be done in a short time (about half-life time). Each manufacturer and research institute is competing for a better synthesis device.

  This automatic synthesizer includes various reaction vessels, heating and cooling devices, multi-way valves such as two-way valves and six-way valves for controlling the flow path, injection devices for injecting samples and solvents, It consists of various sensors, joints for connecting cylinders and tubes, etc., but it handles large amounts of radioactivity (about 1 Ci), strong acids, organic solvents, etc. Airtightness is required, and in addition, due to the nature of being installed in a narrow hot cell, each part is required to be downsized, easy to detach and maintain.

Therefore, as the joint, for example, the following is known (see, for example, Patent Document 1). That is, this joint is configured so that a plug to which a tube or pipe is connected and a socket to which the tube or pipe is connected can be detachably coupled with one touch.
Japanese Patent Laid-Open No. 7-174279 (paragraphs 0018 and 0019, FIG. 1)

  Incidentally, a large number of tubes are usually used in the automatic synthesizer, and simple connection and disconnection of these many tubes is required. However, normally, as described in Patent Document 1, since a large number of tubes are connected to each other using a joint dedicated to each one, in this case, the work time spent on the connection work inevitably increases. Workers' radiation exposure increases. In addition, since a work space is required between the joints, it is difficult to reduce the size of the automatic synthesis apparatus.

  In view of the above problems, the present invention can collectively and hermetically connect a plurality of first tubes and a plurality of second tubes even in a narrow work space, and easily attach and detach these tubes in a short time. An object of the present invention is to provide a one-touch joint that can be used in a simple manner.

  The present invention is configured to solve the above-mentioned problem, and the invention according to claim 1 has a first abutting surface and a plurality of first apertures opened to the first abutting surface. A first joint member provided with a plurality of insertion holes, and a second joint member having a second abutting surface and provided with a plurality of second insertion holes that open to the second abutting surface A pressing plate provided with a plurality of through holes that are in contact with the first and second abutting surfaces and communicated with the first and second insertion holes, the first joint member, A one-touch joint including two joint members and a fixing means for integrally fixing the pressing plate, wherein the first and second insertion holes and the through hole are arranged coaxially with each other, A plurality of first tubes are inserted into the insertion holes from a side opposite to the first abutting surface, and the second abutting surfaces are defined in the plurality of second insertion holes. By inserting a plurality of second tubes from the opposite side and inserting the plurality of first tubes through the plurality of through holes into the plurality of second insertion holes, respectively. The one-touch joint is characterized in that the first tube and the plurality of second tubes are communicated with each other in the plurality of second insertion holes.

  According to the one-touch joint according to claim 1, a plurality of first tubes are inserted into the plurality of first insertion holes, the plurality of through holes, and the plurality of second insertion holes, and the plurality of second insertion holes are inserted. By inserting a plurality of second tubes into the insertion hole and fixing the first joint member, the second joint member, and the pressing plate with a fixing means in this state, the plurality of first tubes and the plurality of tubes are fixed. The second tubes can be communicated together in the second insertion hole.

  According to a second aspect of the present invention, at least one of the plurality of first tubes is a urethane tube, and the second abutting surface of at least one second insertion hole of the second joint member. 2. The one-touch joint according to claim 1, wherein an O-ring that seals a gap between the second insertion hole and the urethane tube is attached to an opening end side that opens to the top.

  According to the one-touch joint of the second aspect, it is possible to seal between the second insertion hole of the second joint member and the urethane tube using the O-ring.

  According to a third aspect of the present invention, at least one of the plurality of first tubes is a polyfluorinated polyfluorinated ethylene tube, and at least one of the plurality of second insertion holes has at least one second insertion hole. 3. The one-touch joint according to claim 1, further comprising a tapered seal portion that gradually decreases in diameter toward a direction in which the polyfluorinated polyethylene tube is inserted into the second insertion hole. It is.

  According to the one-touch joint of the third aspect, by inserting the polyfluorinated polyethylene tube into the seal portion of the second insertion hole, the seal portion can be caused to bite into the outer peripheral surface of the polyfluorinated ethylene tube. It is possible to seal between the ethylene fluoride tube and the second insertion hole.

  According to a fourth aspect of the present invention, at least one member of the first joint member and the second joint member is provided with a positioning pin, and at least the pressing plate and the other member are fitted with the positioning pin. The one-touch joint according to any one of claims 1 to 3, wherein a pin hole is provided.

  According to the one-touch joint according to claim 4, the first joint member and the second joint member can be automatically positioned by inserting the positioning pin into the pin hole, and the first joint member And the second joint member can be assembled smoothly.

  The invention according to claim 5 is characterized in that the through hole is provided with a guide portion formed of a tapered hole that gradually decreases in diameter from the opening end opened to the first abutting surface toward the back portion. The one-touch joint according to any one of claims 1 to 4.

  According to the one-touch joint according to claim 5, when the plurality of first tubes are inserted into the second insertion hole through the through hole, the first tube is inserted into the through hole by the guide portion formed of a tapered hole. The first tube can be easily guided in a short time.

  According to the present invention, a plurality of first tubes and a plurality of second tubes can be collectively communicated using the first joint member, the second joint member, and the pressing plate, Therefore, it is not necessary to individually connect the first tube and the plurality of second tubes, and the connection work can be easily performed in a short time. In addition, the gap between the second insertion hole of the second joint member and the first tube can be sealed using an O-ring, and the performance, reliability, and the like of the one-touch joint can be further enhanced. Furthermore, the first joint member and the second joint member can be automatically positioned by inserting the positioning pins into the pin holes, and the positioning operation of the first joint member and the second joint member is performed. Can be performed efficiently. By inserting the first tube into the tapered portion of the second insertion hole, the gap between the first tube and the insertion hole can be reliably sealed, and the performance and reliability of the one-touch joint can be improved. Moreover, the first tube can be smoothly guided into the through hole by inserting the first tube into a guide portion formed of a tapered hole provided in the through hole of the pressing plate.

  A one-touch joint according to an embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 1, the one-touch joint 10 according to the present embodiment includes a first joint member 20, a first joint member 30, a first joint member 20 made of square material using a resin material such as PEEK (polyetheretherketone). A presser plate 40 made of a metal plate or the like provided between the joint member 20 and the second joint member 30 is provided. The first joint member 20 includes two first polyfluorinated ethylene tubes 50A and 50A (hereinafter referred to as the first tube 50A) made of tetrafluoroethylene and the like, and four pieces made of polyurethane and the like. First urethane tubes 60A, 60A,... (Hereinafter referred to as first tube 60A) are attached. Further, the second joint member 30 also includes two second polyfluorinated ethylene tubes 50B and 50B (hereinafter referred to as second tubes 50B) made of tetrafluoroethylene and the like, and four pieces made of polyurethane and the like. Second urethane tubes 60B, 60B,... (Hereinafter referred to as second tube 60B) are attached.

  Here, as shown in FIG. 1, the first joint member 20 is formed to have a substantially convex shape when viewed from the side. As shown in FIG. 8, the first joint member 20 is formed with one notch groove 22 (see FIG. 3) on the side surface 21 side and in the middle in the longitudinal direction. In addition, two semicircular arc grooves 22B and 22B extending in parallel to be spaced apart in the longitudinal direction of the one side surface 21 are formed on the groove bottom 22A of the one cut-out concave groove 22. Note that the arc radius of the semicircular groove 22B is formed to be slightly smaller than the outer radius of the first tube 50A.

  As shown in FIGS. 7 and 8, a grip plate 23 is detachably fitted and attached to the one notch groove 22 via a screw 23A or the like. Two semicircular arc grooves 23B and 23B are formed at positions corresponding to the semicircular arc grooves 22B and 22B on the back side (rear side) of the grip plate 23 that contacts the groove bottom 22A of one notch concave groove 22. Has been. Note that the arc radius of the semicircular groove 23B is formed to be slightly smaller than the outer radius of the first tube 50A. For this reason, when the gripping plate 23 is attached to one of the notch concave grooves 22, the semicircular arc grooves 22B and 23B are strongly pressed against the outer peripheral surface of the first tube 50A. As a result, the first tube 50A is stable between the semicircular arc grooves 22B and 23B in a state in which the tip side protrudes from the first abutting surface 29 of the first joint member 20 by a predetermined dimension. It can be gripped. Moreover, the semicircular grooves 22B and 23B constitute a first insertion hole into which the first tube 50A is inserted.

  As shown in FIGS. 7 and 9, the first joint member 20 is formed with the other notch groove 25 (see FIG. 3) in the middle portion in the longitudinal direction thereof located on the other side surface 24 side. ing. Further, four semicircular arc grooves 25B, 25B,... Extending in parallel with being spaced apart in the longitudinal direction of the other side surface 24 are formed in the groove bottom 25A of the other notch groove 25. Note that the arc radius of the semicircular groove 25B is formed to be slightly smaller than the outer radius of the first tube 60A.

  Further, as shown in FIGS. 7 and 9, a grip plate 26 is detachably fitted and attached to the other notch groove 25 through screws 26A, 26A and the like. On the back side (back side) of the gripping plate 26 that contacts the groove bottom 25A of the other notch groove 25, four semicircular grooves 26B, 26B are provided at positions corresponding to the semicircular grooves 25B, 25B,. , ... are formed. The arc radius of the semicircular groove 26B is formed with a slightly smaller dimension than the outer peripheral radius of the first tube 60A. For this reason, when the holding plate 26 is attached to the other notch groove 25, the semicircular grooves 25B and 26B are strongly pressed against the outer peripheral surface of the first tube 60A. As a result, the first tube 60A is stable between the semicircular arc grooves 25B and 26B in a state in which the distal end of the first tube 60A protrudes from the first abutting surface 29 of the first joint member 20 by a predetermined dimension. It can be gripped. The semicircular grooves 25B and 26B constitute a first insertion hole into which the first tube 60A is inserted.

  Further, as shown in FIGS. 7 to 9, the first joint member 20 has a first abutting surface 29 formed of a rectangular flat surface, and the first abutting surface 29 includes a pressing plate. One side of 40 is abutted. Further, through holes 52 (see FIG. 1) into which fixing screws 51 as fixing means are inserted are formed on both sides of the first joint member 20, and pin mounting holes into which positioning pins 53 are press-fitted. 54 is formed. The positioning pin 53 is formed with a tapered portion 53A that gradually decreases in diameter from the middle portion in the length direction toward the tip. Furthermore, brackets 20A and 20A are projected from both ends of the first joint member 20, and mounting holes 20B and 20B are formed in the brackets 20A and 20A, respectively.

  As shown in FIGS. 6 and 7, the second joint member 30 is formed to have a substantially convex shape when viewed from the side, similarly to the first joint member 20. The second joint member 30 has a second abutting surface 31 formed of a rectangular flat surface, and the other abutting surface of the pressing plate 40 is abutted against the second abutting surface 31. Further, as shown in FIG. 4, the second joint member 30 is provided with second insertion holes 32 and 32 which are stepped holes at positions corresponding to the first tubes 50A and 50A, respectively. The second insertion hole 32 includes a large-diameter hole portion 32A that is a screw hole into which the connector 56 is screwed, an intermediate hole portion 32B into which the first tube 50A is inserted through a slight gap, and a first A small diameter hole portion 32C formed with a slightly smaller hole diameter than the tube 50A, and gradually reducing the diameter from the intermediate hole portion 32B toward the small diameter hole portion 32C (in the direction of inserting the first tube 50A). And the tapered portion 32D. The second tubes 50B and 50B are inserted into the large-diameter holes 32A and 32A of the second insertion holes 32 and 32 via connectors 56 and 56, respectively. The first tubes 50A and 50A are inserted into the intermediate hole portions 32B and 32B, the tapered portions 32D and 32D, and the small-diameter hole portions 32C and 32C. The distal ends of the first tubes 50A and 50A are the first ones. The two tubes 50B and 50B are in contact with each other. Then, by inserting the first tube 50A into the tapered portion 32D of the second insertion hole 32 as described above, the tapered portion 32D bites into the outer peripheral surface of the first tube 50A, thereby the first tube. The space between 50A and the tapered portion 32D is sealed.

  Further, as shown in FIG. 5, the second joint member 30 has other second insertion holes 33, 33, which are stepped holes at positions corresponding to the first tubes 60A, 60A,. ... is formed. Then, the second tubes 60B, 60B,... Are inserted into the other second insertion holes 33, 33,. Of these second insertion holes 32, 33, the second insertion hole 33 has an O-ring 55 positioned on the opening end side that opens to the second abutting surface 31, as shown in FIG. An annular step portion 33A to be mounted is formed. The O-ring 55 seals between the second insertion hole 33 and the first tube 60A.

  Further, as shown in FIG. 7, screw holes 34 and 34 into which screws 58 and 58 are screwed are formed on both sides of the second joint member 30. In addition, screw holes 35 and 35 into which fixing screws 51 and 51 are screwed are formed on both ends of the second joint member 30 and positioning pin holes 36 and 35 into which positioning pins 53 and 53 are inserted. 36 is formed. In addition, brackets 30A and 30A project from the second joint member 30, and mounting holes 30B and 30B are formed in the brackets 30A and 30A.

  As shown in FIGS. 4, 5, and 7, both sides of the pressing plate 40 are the first abutting surface 29 of the first joint member 20 and the second abutting surface 31 of the second joint member 30. I am in conflict with. Further, the holding plate 40 is formed with through holes 41 and 41 at positions corresponding to the first tubes 50A and 50A. That is, the semicircular grooves 22B and 23B, which are the first insertion holes, the second insertion hole 32, and the through hole 41 are arranged coaxially. And in this through-hole 41, 41 in the opening end side opened to the 1st abutting surface 29 of the 1st joint member 20, from this opening end to the back part (2nd of the 2nd joint member 30). Guide portions 41A and 41A (see FIG. 4) are formed of tapered holes that gradually decrease in diameter toward the abutting surface 31 side. Further, the holding plate 40 has through holes 42, 42,... At positions corresponding to the first tubes 60A, 60A,. That is, the semicircular grooves 25B and 26B, the second insertion hole 33, and the through hole 42, which are the first insertion holes, are arranged coaxially. In the through holes 42, 42,..., The opening end side that opens to the first abutting surface 29 of the first joint member 20 extends from the opening end to the back part (the second joint member 30 of the second joint member 30. The other guide portions 42A, 42A,... (See FIG. 5) are formed of tapered holes that gradually decrease in diameter toward the second abutting surface 31 side.

  Further, as shown in FIG. 7, insertion holes 43 and 43 through which the screws 58 and 58 are inserted are formed on both sides of the pressing plate 40 at positions corresponding to the screw holes 34 and 34. In addition, other insertion holes 44 and 44 through which the fixing screws 51 and 51 are inserted are formed at positions corresponding to the screw holes 35 and 35 at both ends of the holding plate 40, and a pin through which the positioning pin 53 is inserted. Insertion holes 45, 45 are formed. Further, the presser plate 40 is attached integrally with the second abutting surface 31 of the second joint member 30 by screwing each screw 58 into the screw hole 34.

  As shown in FIG. 7, the one-touch joint 10 is configured so that the distal end side (see FIGS. 8 and 9) of the first tubes 50 </ b> A and 60 </ b> A protruding from the first joint member 20 is connected to the through hole 41 of the press plate 40. , 42 are inserted into the second insertion holes 32, 33 of the second joint member 30, and in this state, the first joint member 20, the second joint member 30, and the presser plate 40 are integrated using the fixing screw 51. Secure to. Thus, the first tubes 50A and 60A and the second tubes 50B and 60B are communicated with each other in the second insertion holes 32 and 33 (see FIGS. 4 and 5). The one-touch joint 10 is fixedly attached to an automatic synthesizing device (not shown) or the like by inserting bolts (not shown) or the like into mounting holes 20B and 30B provided in the brackets 20A and 30A. .

(Assembly procedure of one-touch fitting 10)
Next, the assembly procedure of the one-touch joint 10 will be described.
First, the gripping plates 23 and 26 are fastened to the notched recess grooves 22 and 25, so that the first tubes 50 A and 60 A are connected to the semicircular grooves 23 B and 26 B of the gripping plates 23 and 26 and the half of the notch recess grooves 22 and 25. Grip between the arc grooves 22B and 25B, respectively, and the distal ends of the first tubes 50A and 60A are projected from the first abutting surface 29 by a predetermined dimension. Next, the distal ends of the second tubes 50B and 60B are inserted into the second insertion holes 32 and 33 through the connectors 56 and 57, respectively. Next, the presser plate 40 is attached to the second abutting surface 31 of the second joint member 30 with screws 58. Finally, the first tube 50A, 60A is inserted through the through holes 41, 42 into the second insertion of the second joint member 30 while the positioning pin 53 is inserted into the pin hole 36 through the pin insertion hole 45. The first joint member 20, the second joint member 30, and the pressing plate 40 are integrally fixed using the fixing screw 51 in this state.

  Here, since the positioning pin 53 is formed with a tapered portion 53A at the tip side, as described above, when the positioning pin 53 is inserted into the pin hole 36, the positioning pin 53 is pinned by the tapered portion 53A. 36 can be smoothly guided, and the second joint member 30 can be easily positioned with respect to the first joint member 20.

  Further, since the guide portions 41A and 42A are formed in the through holes 41 and 42 of the holding plate 40, the first joint members 50A and 60A are connected to the second joint member through the through holes 41 and 42 as described above. When inserting into the second insertion holes 32, 33, the guide tubes 41A, 42A can smoothly guide the first tubes 50A, 60A into the through holes 41, 42. Can be performed smoothly.

  Therefore, in the present embodiment, a plurality of first tubes 50A, 60A and a plurality of second tubes 50B, 60B can be connected together even in a narrow work space, and these first tubes 50A, 60A. And the second tube 50B, 60B can be easily attached and detached in a short time.

  Moreover, the tapered portion 32D is formed by making the hole diameter on the most reduced side of the tapered portions 32D, 32D provided in the second insertion holes 32, 32 smaller than the outer diameter of the first tubes 50A, 50A. , 32D can be made to bite into the outer peripheral surface of the first tubes 50A, 50A, or the entire outer periphery of the first tubes 50A, 50A can be tightened. Thereby, it is possible to satisfactorily seal between the second insertion holes 32 and 32 and the first tubes 50A and 50A.

  In addition, since the O-ring 55 is attached to the second insertion hole 33 so as to be located on the opening end side opened to the second abutting surface 31, the O-ring 55 and the first insertion hole 33 are connected to the first insertion hole 33. It is possible to satisfactorily seal between the tube 60A.

  In the present embodiment, the case where the first and second tubes 50A and 50B are formed using tetrafluoroethylene has been described as an example. However, the present invention is not limited to this, and for example, the first tube The second tubes 50A and 50B may be formed using other materials such as urethane rubber.

  In the present embodiment, the case where the first and second tubes 60A and 60B are formed using urethane rubber has been described as an example. However, the present invention is not limited to this, and for example, the first and first tubes The two tubes 60A and 60B may be formed using other materials such as ethylene tetrafluoride.

  In the present embodiment, the first tube 60A and the second tube 60B are separated from each other. However, the present invention is not limited to this, and, for example, the first tube 50A and the second tube Similarly to 50B, it is preferable to connect the tip of the first tube 60A and the tip of the second tube 60B in contact with each other because a liquid pool does not occur.

  Furthermore, it is preferable that the presser plate 40 and the second joint member 30 are fixed by screws 58, and then the first joint member 20, the second joint member 30 and the presser plate 40 are fixed by fixing means. Without fixing the plate 40 and the second joint member 30, the positioning pins 53 are inserted into the pin holes 36 before the tips of the first tubes 50 </ b> A and 60 </ b> A reach the through holes 41 and 42 of the holding plate 40. In this way, the distal ends of the first tubes 50A, 60A are always guided by the guide portions 41A, 42A of the through holes 41, 42 and guided into the second insertion holes 32, 33 simply by pushing the positioning pin 53. It can also be.

It is a side view which shows the one-touch coupling which concerns on embodiment of this invention. It is a top view which shows the one-touch coupling which concerns on embodiment of this invention. It is the elements on larger scale which expand and show the a section in FIG. It is sectional drawing which looked at the one-touch coupling from the arrow IV-IV direction in FIG. It is sectional drawing which looked at the one-touch coupling from the arrow VV direction in FIG. It is a perspective view which shows the one-touch coupling which concerns on embodiment of this invention. It is a disassembled perspective view which shows the one-touch coupling in FIG. It is a disassembled perspective view which shows the state which removed the holding | grip board from one notch concave groove. It is a disassembled perspective view which shows the state which removed the holding plate from the other notch concave groove.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 One-touch coupling 20 1st coupling member 30 2nd coupling member 40 Holding plate 50A 1st polyfluorinated ethylene tube 50B 2nd polyfluorinated ethylene tube 60A 1st urethane tube 60B 2nd urethane tube 23,26 Grasp Plate 29 First abutting surface 31 Second abutting surface 36 Pin hole 43, 44 Insertion hole 51 Fixing screw (fixing means)
53 Positioning pin 55 O-ring

Claims (5)

A first joint member having a first abutting surface and provided with a plurality of first insertion holes that open to the first abutting surface; a second abutting surface; A second joint member provided with a plurality of second insertion holes that are open on the second abutting surface, and both surfaces abut on the first and second abutting surfaces, and the first and second A one-touch joint comprising: a pressing plate provided with a plurality of through holes communicating with the insertion hole; and a fixing means for integrally fixing the first joint member, the second joint member, and the pressing plate,
The first and second insertion holes and the through hole are arranged coaxially with each other,
A plurality of first tubes are inserted into the plurality of first insertion holes from the side opposite to the first abutting surface,
A plurality of second tubes are inserted into the plurality of second insertion holes from the side opposite to the second abutting surface;
The plurality of first tubes and the plurality of second tubes are inserted into the plurality of second insertion holes through the plurality of first tubes, respectively. Are connected to each other in the plurality of second insertion holes to communicate with each other.   At least one of the plurality of first tubes is a urethane tube, and an opening end side that opens to the second abutting surface of at least one second insertion hole of the second joint member. The one-touch joint according to claim 1, wherein an O-ring that seals between the second insertion hole and the urethane tube is attached to the one-touch joint.   At least one of the plurality of first tubes is a polyfluorinated ethylene tube, and at least one second insertion hole of the plurality of second insertion holes includes the polyfluorinated ethylene tube. 3. The one-touch joint according to claim 1, further comprising a tapered seal portion that gradually decreases in diameter in a direction of insertion into the two insertion holes.   At least one of the first joint member and the second joint member is provided with a positioning pin, and at least the holding plate and the other member are provided with pin holes into which the positioning pin is inserted. The one-touch coupling according to any one of claims 1 to 3, wherein the one-touch coupling is characterized in that:   5. The guide portion comprising a tapered hole that gradually decreases in diameter as it goes from the opening end that opens to the first abutting surface to the inner portion, is provided in the through hole. The one-touch coupling according to any one of the above.

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