JP2007120662A - Connection apparatus and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connection apparatus capable of being manufactured at a low cost while maintaining a smooth attach/detach operation, a disconnection stop function and the sufficient durability of engaging surfaces. <P>SOLUTION: The connection apparatus 10 is provided with a pair of coupler 10a in the same forms. The coupler 10a includes a coupler body 11, a fitting part 6, a guide surface 31a and an engaging surface 41. The fitting part 6 has recessed parts 33 and protruding parts 30 alternatively aligned at the tip 11b of the coupler body 11 along a reference circle K and fits with each other. The guide surface 31a is formed at the protruding part 30 along a surface including an axial center line H and guides the mutual fitting of the fitting parts 6 by contacting with each other by a surface at the time of the attach/detach operation of the pair of coupler 10a. The engaging surface 41 is formed at the protruding part 30 and has contacting parts 41a which contact with each other in a direction the pair of couplers 10a move apart from each other in the axial center line H direction. The engaging surface 41 is formed in a plane inclining in the protruding direction of the protruding part 30 from a first side edge 42 to a back side along the reference circle K. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a coupling device including a pair of couplers that can be coupled to each other without distinguishing between males and females, for example, for coupling fire fighting hoses and the like, and a manufacturing method thereof.

  A coupling fitting (coupling device) that couples hoses to be coupled to each other, such as a fire hose, has a pair of coupling bracket bodies (couplers) that have the same shape and are detachably coupled to each other. The coupling metal bodies are attached one by one to the ends of the hoses to be coupled, and the hoses to be coupled are coupled to each other by being coupled to each other.

  The front end face of each coupling metal body is provided with a seal surface that abuts the mating coupling metal body. In addition, a plurality of fitting protrusions (convex portions) are formed in the circumferential direction on the front end surface of each coupling metal body portion so as to surround the sealing surface.

  Each fitting protrusion protrudes toward the mating fitting main body in the axial direction of the coupling fitting main body. Between the fitting protrusions adjacent to each other in the circumferential direction, a fitting recess (recess) into which the fitting protrusion of the mating fitting main body can be fitted is defined by the adjacent fitting protrusions. .

  A locking collar portion is formed on one side of the side of each fitting projection that crosses the circumference where the fitting projections are arranged. Each locking hook is formed in a hook shape, and is engaged with the mating locking hook in the circumferential direction in a state where each fitting protrusion is fitted in the fitting recess of the mating fitting main body. Match.

  Each of the coupling metal bodies is coupled to each other by engaging each of the latching hooks with the locking collar of the coupling metal body on the other side. In the state in which the respective coupling fitting main bodies are coupled to each other, the engaging hooks have engaging surfaces at the end surfaces facing each other (see, for example, Patent Document 1).

  On the other hand, in order to smoothly perform the attaching / detaching operation of each coupling fitting, the side surface (guide surface) of each fitting projection on the locking collar portion side is configured by a surface passing through the axial center line of the coupling fitting main body. For this reason, the extension line | wire of the side of the engaging surface located on this side surface passes along the axial center line | wire of a coupling metal fitting body (for example, refer patent document 2).

  In addition, when a fluid such as water flows in the state where the coupling metal bodies are coupled to each other, the load acting in the direction in which the coupling metal bodies are separated from each other acts on the engagement surface of each locking collar. To do. For this reason, in order to improve the durability of the engagement surface, contact portions to be brought into contact with the mating engagement surface among the respective engagement surfaces are formed so as to be in contact with each other, that is, in surface contact with each other. Yes. Therefore, the extension lines on both sides of the contact portion of the engagement surface crossing the circumferential direction in which the fitting protrusions and the fitting recesses are arranged pass through the axis of the coupling metal body.

  Further, the contact portion is constituted by a group of lines that are directed to the axial center line of the coupling metal body and whose extension line vertically crosses the axial center line.

  In addition, in order to prevent the coupling state of each coupling metal member from being released unexpectedly, each engagement surface is formed on the back side along the circumference in which the fitting protrusions are arranged from the side of the locking collar portion side. It inclines in the protrusion direction of the fitting protrusion. By tilting the engagement surface, the relative rotation of the coupling metal bodies in the direction of releasing the engagement of the locking hooks around the axis of the coupling metal body is suppressed. . Therefore, the unintentional release of the coupling between the coupling metal bodies is suppressed.

Each engaging surface having the above shape is a curved surface. For this reason, the engagement surface includes a rotation axis for rotating the workpiece forming the coupling metal body, an axis for relatively directing the tool for cutting the workpiece to the workpiece, and the axis of the workpiece with respect to the workpiece. A machining center that can control several axes at the same time among an axis that moves relative to the line direction and an axis that moves the tool relative to the workpiece to correct the tool diameter. Formed by the device.
Japanese Patent Laid-Open No. 9-119577 JP-A-9-280453

  However, the coupling fitting disclosed in Patent Document 1 requires a machine such as a machining center capable of simultaneously controlling multiple axes in order to form the engagement surface in a curved surface. In general, such devices are expensive. Therefore, the cost of the coupling fitting tends to increase.

  Accordingly, an object of the present invention is to provide a coupling device that can be manufactured at low cost while maintaining smoothness of attachment / detachment operation, retaining function and sufficient durability of an engagement surface.

  The coupling device of the present invention includes a pair of cylindrical couplers of the same shape that are detachably coupled to each other in the direction of a straight axis. The coupler includes a cylindrical coupler main body, a fitting portion, a guide surface, and an engagement surface. The fitting portion includes concave portions and convex portions provided alternately along the tip of the coupler main body along a reference circle around the axis of the coupler. The fitting portion fits with the mating fitting portion. The guide surface is formed as a convex portion along a plane including the axial center line of the coupler, and is brought into surface contact with each other when the pair of couplers are attached and detached to guide fitting between the fitting portions. The engaging surface is formed as a convex portion, and has a contact portion in which the pair of engaged couplers are in surface contact with each other in a direction away from each other in the axial direction. The engaging surface is formed on a plane inclined in the protruding direction of the convex portion from the first side on the guide surface side to the second side on the back side along the reference circle.

  In such a coupling device, when coupling the couplers, the guide surface is brought into contact with the guide surface of the mating coupler so that the guide surface guides the fitting between the fitting portions. It becomes easier to perform the attachment / detachment work between the two.

  The guide surface is formed on a surface including the axial center line of the coupler. For this reason, the reaction force generated between the guide surfaces when each guide surface comes into surface contact with the guide surface of the counterpart coupler does not have a component force toward the axial center line of the coupler. That is, the axis line of each coupler does not shift during the attaching / detaching operation of each coupler.

  Furthermore, since the engaging surfaces have an inclination, it becomes difficult to release the engagement between the engaging surfaces. Further, the contact portions of the engagement surfaces are in surface contact with each other. For this reason, the load which pulls apart each main-body part can fully be received. Furthermore, since the engagement surface is formed as a flat surface, the engagement surface can be formed without using an expensive device such as a machining center that simultaneously controls multiple axes.

In such a case, in the coupling device of the present invention, the engagement surface is

It forms in the plane which becomes.

  The first length K1 is the length from the first contact portion end point to the intersection of the first imaginary line and the reference plane. The first contact portion end point is an end point located outside the reference circle on the guide surface side side of the contact portion on the guide surface side. The first imaginary line is a line including the first contact portion end point and extending in parallel with the axial line of the coupler. The reference plane is a plane orthogonal to the axial center line of the coupler. The second length K2 is a length from the second contact portion end point to the intersection of the second imaginary line and the reference plane. The second contact portion end point is an end point located inside the reference circle on the side on the guide surface side. The second imaginary line is a line including the second contact portion end point and extending in parallel with the coupler axis. The third length K3 is a length from the third contact portion end point to the intersection of the third imaginary line and the reference plane. A 3rd contact part end point is an end point located in the outer side of a reference | standard circle in the back | inner side side along the reference | standard circle in a contact part. The third imaginary line is a line including the third contact portion end point and extending in parallel with the coupler axis. The fourth length K4 is the fourth length from the fourth contact portion end point to the intersection of the fourth imaginary line and the reference plane. The fourth contact portion end point is an end point located inside the reference circle on the back side. The fourth imaginary line is a line including the fourth contact portion end point and extending in parallel with the axial line of the coupler.

  Alternatively, in such a case, in the coupling device of the present invention, the first reference plane is formed such that each extension line intersects the axial center line of the coupler between the guide surface side side and the back side side. The first imaginary side and the second imaginary side obtained by projecting the guide surface side side and the back side side on the coupler in the direction of the axis of the coupler intersect with each other at an angle β on the axis of the coupler. To be formed. The guide surface side edge is the guide surface side edge of the contact portion. The back side is a side on the back side along the reference circle in the contact portion. The first reference plane is a plane that includes an end point located outside the reference circle on the first side and is orthogonal to the axial line of the coupler.

An engagement surface is formed on the third reference plane. The third reference plane has the second reference plane in the protruding direction of the convex portion with the second line on the axis center line side of the second line on the second reference plane and the second line as the rotation axis.

  It is an inclined surface. The second reference plane is a plane that includes the first line and in which the second virtual side side is inclined with respect to the first reference plane by an angle α in the projecting direction of the convex portion relative to the first virtual side side. is there. The first line is a line that includes the end point of the first side located outside the reference circle and is orthogonal to the axial line of the coupler. The second line is a line that is included in the second reference plane and includes the end point of the first side and is perpendicular to the first side.

  In order to enable easy manufacture of the coupling device, the second side is formed in parallel with the guide surface in a state where the engagement surface is viewed from the axial direction.

  In this way, when the tool for forming the engagement surface is cut in a posture parallel to the guide surface, the engagement surface is formed only by moving the main body portion in one direction relative to the tool. Is done.

  In the manufacturing method of the coupling device according to the present invention, a universal milling machine is used. The coupling device includes a pair of cylindrical couplers having the same shape that are detachably coupled to each other in the direction of the axial line that is a straight line. The coupler includes a cylindrical coupler main body, a fitting portion, a guide surface, and an engagement surface. The fitting portion includes concave portions and convex portions provided alternately along the tip of the coupler main body along a reference circle around the axis of the coupler. The fitting portion fits with the mating fitting portion. The guide surface is formed in a convex portion along a plane including the axial center line of the coupler, and guides the fitting between the fitting portions when the pair of couplers is attached and detached. The engaging surface is formed as a convex portion, and has a contact portion in which the pair of engaged couplers are in surface contact with each other in a direction away from each other in the axial direction. The engagement surface is a flat surface.

  The guide surface side side and the back side side are configured such that the extension line intersects with the coupler axis and the guide surface side side and the back side side are coupled to each other on the first reference plane. The first imaginary side and the second imaginary side projected in the direction of the axial center line are formed so as to intersect at an angle β on the axial center line of the coupler. The guide surface side edge is the guide surface side edge of the contact portion. The back side is a side on the back side along the reference circle in the contact portion. The first reference plane is a plane orthogonal to the axial center line of the coupler through an end point located outside the reference circle on the first side of the engagement surface on the guide surface side.

The engagement surface is formed on the third reference plane. The third reference plane has the second reference plane in the protruding direction of the convex portion with the second line on the axis center line side of the second line on the second reference plane and the second line as the rotation axis.

  It is an inclined surface. The second reference plane is a surface that includes the first line, and the second virtual side side is inclined with respect to the first reference plane by an angle α in the protruding direction of the convex portion relative to the first virtual side side. is there. The first line is a line that includes the end point of the first side located outside the reference circle and is orthogonal to the axial line of the coupler. The second line is a line that is included in the second reference plane and includes the end point of the first side and is perpendicular to the first side.

  The universal milling machine includes a tool, a table, an index, and a machining head. The tool cuts a workpiece as a material of a coupler having a first end where the fitting portion is formed and a second end opposite to the first end. A work is fixed to the table. The fixing means can fix the workpiece to the table. The machining head holds the tool. The processing head and the table are relatively movable in a third direction along a direction away from and closer to each other, and in a first direction and a second direction perpendicular to the third direction. The fixing means fixes the workpiece to the table in a state where the axis of the workpiece is inclined with respect to the first direction within a plane defined by the first direction and the second direction. The machining head can change its posture in a state in which the axis of the tool is inclined with respect to the third direction in a plane perpendicular to the second direction.

  First, a guide surface is formed at the first end by moving the cutting line of the tool along the contour of the recess. In addition, the cutting line of a tool is a line which connected the front-end | tip of the radial direction cut | incision to the said workpiece | work in a cylindrical tool. In other words, in the contact range of the tool with the workpiece, the edge on the cutting side in the direction perpendicular to the traveling direction of the tool.

After forming the guide surface, the axis of the workpiece is set to the first direction so that the engagement surface to be formed is parallel to the plane defined by the second axis and the third axis. The angle α is inclined, and the axis of the tool is angled so that the tip of the tool approaches the tip of the first end with respect to the third axis.

  Tilt. And a tool is positioned in the site | part in which an engagement surface should be formed, a workpiece | work is moved to a 2nd direction, and an engagement surface is formed.

  In this specification, unless expressed otherwise, when expressed as lines and sides, these lines and sides are linear. Unless otherwise stated, when expressed as surfaces, these surfaces are planar.

  According to the coupling device of the present invention, since the center line of each coupler body does not shift during the attachment / detachment operation between the couplers, the smoothness of the attachment / detachment operation between the couplers is maintained. In addition, in a state where the couplers are coupled to each other, the engagement state of the engagement surfaces is difficult to be released, so that it is possible to prevent the couplers from being unexpectedly disconnected. Further, since the coupling device receives a load when the contact portion comes into surface contact, durability of the engagement surface with respect to a load that separates the couplers is improved. When surface treatment such as anodizing is applied, it is important to reduce the surface pressure, which is the load per unit area, so surface treatment such as anodizing is particularly effective for the coupling device of the present invention. is there.

  Further, the coupler can be manufactured without using an expensive machining center. Further, since the engaging surface is flat, the coupler of the present invention can be easily manufactured by forging or casting. In addition, even if it is an assembly type coupler which forms a coupler main body and several convex part mutually independently, processing of a convex part becomes easy.

  That is, according to the present invention, it is possible to manufacture the coupling device at a reduced cost while maintaining smoothness of the attaching / detaching operation, a sufficient retaining function and durability of the engaging surface.

  Hereinafter, a coupling device according to an embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 1, the coupling device 10 includes a pair of couplers 10a. One coupler 10 a is fixed to the end of the first hose 13. The other coupler 10 a is fixed to the end of the second hose 14. When the couplers 10a are coupled, the front end surfaces 15 of the couplers 10a face each other.

  The coupler 10 a is cylindrical and includes a coupler body 11. The coupler main body 11 is substantially cylindrical. The coupler main body 11 has a base portion 11a and a tip portion 11b. The base 11a has a substantially circular cross section. The cross section has a shape in which the outer diameter of the cross section increases as it advances toward the tip end portion 11b in the direction of the axis H of the coupler 10a. The distal end portion 11b extends in the direction of the axis H of the coupler 10a from the end portion of the base portion 11a having the larger cross section. The cross section of the front end portion 11b is substantially a circle and is constant.

  On the inner peripheral surface of the coupler main body 11, a hose attachment portion having serrated irregularities is formed. The end portions of the first and second hoses 13 and 14 are inserted into the hose attachment portion. Then, the tightening ring presses the outer peripheral surfaces of the end portions of the first and second hoses 13 and 14 against the hose attachment portion from the inner peripheral surfaces of the first and second hoses 13 and 14. Therefore, the first and second hoses 13 and 14 are fixed to the coupler 10a. In addition, the said attachment structure is an example, Comprising: It is not limited to this.

  A seal surface member 20 is fixed to the coupler body 11 by, for example, being screwed onto the inner peripheral surface. In the sealing surface member 20, the surface facing the mating coupler 10a is a sealing surface 20a. A seal member 21 is provided on the inner peripheral side of the seal surface 20a over the entire periphery.

  When the couplers 10 a are coupled, the seal surfaces 20 a abut against each other and are made fluid-tight by the seal member 21. When the couplers 10a are coupled to each other, the insides of the couplers 10a communicate with each other. Thereby, the fluid can flow between the first hose 13 and the second hose 14.

  A plurality of convex portions 30 are provided at the distal end portion 11 b of each coupler body 11. Each convex part 30 protrudes toward the coupler 10a of the other party along the axial center line H direction of the coupler 10a. Further, as shown in FIG. 2, the convex portions 30 are arranged at equal intervals on a reference circle K (indicated by a two-dot chain line in FIG. 2) surrounding the seal surface 20a. In the present embodiment, six convex portions 30 are provided, but the present invention is not limited to this. FIG. 2 shows a state in which the coupler 10a is viewed from the front end face 15 side.

  As shown in FIG. 1, each convex portion 30 has a first side surface 31 and a second side surface 32. As shown in FIG. 2, the first side surface 31 and the second side surface 32 cross the reference circle K. On the side portion of the convex portion 30 on the first side surface 31 side, a locking collar portion 40 described later is formed. An urging mechanism 70 described later is provided on the side of the convex portion 30 on the second side surface 32 side. In FIG. 2, the second side surface 32 indicates a side surface at a position advanced in the clockwise direction with respect to the first side surface 31.

  As shown in FIG. 2, a recess 33 is defined between the adjacent protrusions 30 along the reference circle K by the adjacent protrusions 30. Each concave portion 33 can accommodate the convex portion 30 of the mating coupler 10a along the axis H direction. Further, as shown in FIGS. 3 and 15, the concave portion 33 is larger than the convex portion 30 along the reference circle K. Thereby, in a state where the convex portion 30 is accommodated in the concave portion 33 of the counterpart coupler 10a, each coupler 10a can be rotated by a predetermined angle around the axis H direction. FIG. 3 shows a state where the couplers 10a are coupled to each other.

  As shown in FIG. 3, in a state where the couplers 10a are coupled to each other, each convex portion 30 of one coupler 10a is accommodated in the concave portion 33 of the other coupler 10a. The convex part 30 of the other coupler 10a is accommodated in the concave part 33 of one coupler 10a. Further, in a state where the couplers 10a are coupled to each other, the first side surface 31 of the convex portion 30 faces the first side surface 31 of the counterpart coupler 10a. Similarly, the second side surface 32 faces the second side surface 32 of the counterpart coupler 10a. Each convex portion 30 and each concave portion 33 constitute a fitting portion 6.

  As shown in FIG. 4, a hook-like locking collar portion 40 is formed on the side portion of each convex portion 30 on the first side surface 31 side. In a state where the convex portion 30 of each coupler 10a is accommodated in the concave portion 33 of the counterpart coupler 10a, each locking collar 40 can be engaged with the locking collar 40 of the counterpart coupler 10a.

  In a state in which the convex portion 30 is accommodated in the concave portion 33 of the counterpart coupler 10a, the opposing locking collar portions 40 are rotated relative to each other around the axis H in the direction in which they are engaged with each other. The locking hooks 40 engage with each other. Each coupler 10a is locked to be disengaged when each locking hook 40 is engaged.

  The first side surface 31 has a step in the direction of the axis H with the locking collar 40 interposed therebetween. In the 1st side surface 31, the protrusion side of the convex part 30 on both sides of the latching collar part 40 becomes the guide surface 31a. The guide surface 31a is formed on a surface including the axial center line H on its extension.

  A curved portion 34 is formed at the base portion of each locking rod portion 40. The curved portion 34 has a shape in which the convex portion 30 is cut out in a substantially arc shape. The curved portion 34 suppresses stress concentration at the base of the locking collar portion 40. The curved portion 34 may be filled and fixed with an elastic foam material or the like. By doing in this way, it is prevented that foreign materials, such as sand and mud, volume in the curved part 34, and the engagement between the locking collar parts 40 is inhibited.

  A side surface of the locking hook portion 40 on the root side, that is, a surface that faces each other when the locking hook portions 40 are engaged with each other is an engaging surface 41. Each engagement surface 41 engages with the engagement surface 41 of the counterpart coupler 10a in the axial center line H direction when the couplers 10a are coupled to each other.

  As shown in FIGS. 4 and 5, each engagement surface 41 is a flat surface and has first and second side edges 42 and 43 that cross the reference circle K. The first side 42 is located on the guide surface 31a. That is, the extension line of the first side 42 passes through the axial center line H.

  The second side 43 is a side on the back side along the reference circle K. In a state in which the distal end surface 15 is viewed along the axial center line H direction, the second side 43 is parallel to the first side 42. That is, the second side 43 in FIG. 2 is parallel to the first side 42.

  Each engagement surface 41 has a first end point A, a second end point B, a third end point C, and a fourth end point D. The first end point A is an end point located outside the reference circle K on the first side 42. The second end point B is an end point located inside the reference circle K on the first side 42. The third end point C is an end point located outside the reference circle K on the second side edge 43. The fourth end point D is an end point located inside the reference circle K on the second side edge 43.

  The respective locking rods 40 are rotated relative to each other around the axis H until the first end point A of one coupler 10a contacts the third end point C of the other coupler, thereby Engage.

  As shown in FIG. 6, in a state where each locking hook 40 of one coupler 10a is engaged with each locking hook 40 of the other coupler 10a, the first end point A of one coupler 10a is , Abuts on the third end point C of the other coupler 10a. The second end point B of one coupler 10a contacts the contact point E of the other coupler 10a. The third end point C of one coupler 10a abuts on the first end point A of the other coupler 10a. The contact point E of one coupler 10a contacts the second end point B of the other coupler 10a.

  A line 140 passing through the third end point C and the contact point E of the engagement surface 41 overlaps the first side 42 of the counterpart coupler 10a. Therefore, the extension of the line 140 passes through the axis H. The line 140 is a back side on the back side along the reference circle in the contact portion as referred to in the present invention.

  A range (plane) defined by the first to third end points A to C and the contact point E in the engagement surface 41 is a contact portion 41a that is in surface contact with each other. For this reason, the 1st end point A is the same point as the 1st contact part end point said by the present invention. The second end point B is the same point as the second contact portion end point referred to in the present invention. The third end point C is the same point as the third contact portion end point referred to in the present invention. The contact E is a fourth contact end point as referred to in the present invention.

  As described above, the locking hook 40 enters the locking hook 40 of the mating coupler 10a from the first side 42 of the engaging surface 41. That is, the first side 42 side of the engagement surface 41 is a contact portion 41a. Therefore, the first side 42 is also the guide surface side side referred to in the present invention.

  The engagement surface 41 is inclined along the reference circle K such that the back side, that is, the second side 43 side is further away from the first side 42 side in the protruding direction of the convex portion 30.

  When an internal pressure is applied to the engaged coupler 10a and forces in directions away from each other in the direction of the axis H are applied to each coupler 10a, the engagement between the respective locking collars 40 is released by this inclination. In the direction, the couplers 10a are prevented from rotating relative to each other around the axis H. For this reason, it is suppressed that the coupling | bonding of each coupler 10a is cancelled | released unexpectedly.

  Next, the inclination of the contact portion 41a and the engagement surface 41 will be described.

  FIG. 7 shows the first reference plane R1. The first reference plane R1 is a plane orthogonal to the axial center line H. On the first reference plane R1, a fan-shaped imaginary surface 50 centered on the axis H is provided. The virtual surface 50 is a surface obtained by projecting the contact portion 41a of the engaging surface 41 onto the first reference plane R1 in the direction of the axis H, and can sufficiently withstand a load that separates the couplers 10a from each other. It has an area.

  In other words, the area of the contact portion 41a is determined so that it can sufficiently withstand the load that separates the couplers 10a.

  Assume virtual lines extending in parallel with the axis H at the four corners of the virtual plane 50. Although the contact part 41a of the engagement surface 41 is shown in FIG. 7, the first to third end points A to C and the contact point E are arranged on an imaginary line passing through four corners of the imaginary surface 50.

  A line on which the first end point A is arranged is defined as a first virtual line A2. A line on which the second end point B is arranged is a second virtual line B2. A line on which the third end point C is arranged is a third virtual line C2. A line on which the contact E is arranged is a fourth virtual line E2.

  An end point on the virtual plane 50 through which the first virtual line A2 passes is defined as a first virtual end point A1. An end point on the virtual plane 50 through which the second virtual line B2 passes is defined as a second virtual end point B1. An end point on the virtual plane 50 through which the third virtual line C2 passes is defined as a third virtual end point C1. An end point on the virtual plane 50 through which the fourth virtual line E2 passes is defined as a fourth virtual end point E1.

  The virtual surface 50 has a first virtual side 56 and a second virtual side 57. The first virtual side 56 is a line obtained by projecting the first side 42 onto the first reference plane R1 in the direction of the axis H, and the first virtual end point A1 and the second virtual end point B1. To the axial center line H.

  The second virtual side 57 is a line obtained by projecting a line 140 connecting the third end point C and the contact point E onto the first reference plane R1 in the direction of the axis H, and the third virtual end point C1 and the fourth imaginary end point E1 are connected to each other, and are directed toward the axial center line H.

  The first virtual end point A1 is an end point located outside the reference circle K on the first virtual side 56. The second virtual end point B <b> 1 is an end point located inside the reference circle K in the first virtual side 56. The third virtual end point C1 is an end point located outside the reference circle K on the second virtual side 57. The fourth virtual end point E1 is an end point located inside the reference circle K on the second virtual side 57.

  The extended lines of the first virtual side 56 and the second virtual side 57 intersect with each other at an angle β on the axis H. For this reason, when engaging the locking hooks 40 with each other, the couplers 10a are relatively moved about the axis H from the state in which the guide surfaces 31a are in contact with the other guide surface 31a. The angle β is rotated.

  On the other hand, the contact portion 41a of each engagement surface 41 is in surface contact with the contact portion 41a of the counterpart coupler 10a. Therefore, as shown in FIG. 7, the length from the first endpoint A to the first virtual endpoint A1 and the length from the third endpoint C to the third virtual endpoint C1. The total length of the third length K3 is the second length K2 from the second end point B to the second virtual end point B1, and the contact point E to the fourth virtual end point E1. Is equal to the total length of the fourth length K4.

That means

  It becomes.

  When the engagement surface 41 is formed, the first reference plane R1 is defined as a virtual point 120 (a first end point A in FIG. 7) that is a point where the first end point A of the coupler 10a is to be formed. The first length K1 becomes 0 by passing the same point.

  For this reason, each said length K2-K3 can be made into the length from the 1st end point A. FIG. By obtaining K2 to K3, the positions of the second and third end points B and C with respect to the first end point A and the contact point E can be obtained. That is, if the virtual point 120 is determined, the positions of the second and third end points B and C and the position of the contact point E can be obtained.

  In addition, when each latching hook part 40 mutually engages, when each coupler 10a rotates around the axial line H, the 1st end point A is the 1st end of the other party in the axial line H direction. You have to get over the end point A. For this reason, the position of the 1st end point A is set to the position which can get over the 1st end point A of the other party, when each latching hook part 40 engages. More specifically, the length from the front end face 15 of the coupler 10a to the first end point A is shorter than the length from the first end point A to the bottom end of the recess 33.

  In this way, when the convex portion 30 is completely pushed into the concave portion 33 of the counterpart coupler 10a, the first end point A becomes the first end point A of the counterpart coupler 10a in the axial center line H direction. Over.

  In order to obtain the respective lengths K2 to K3, a second reference plane R2 is assumed. The second reference plane R2 includes the first line 141, and the virtual plane 50 side is inclined by an angle α in the protruding direction of the convex portion 30 with respect to the first reference plane R1. The first line 141 is a line that passes through the virtual point 120, that is, the first end point A, and is orthogonal to the axial center line H.

  A third reference plane R3 is assumed. The third reference plane R3 is a plane obtained by rotating the second reference plane R2 around the second line 142 on the second reference plane R2 in the projecting direction of the convex portion 30 on the axis line H side. . The second line 142 is a line on the second reference plane R2, including the first end point A and orthogonal to the first line 141.

  An intersection point of the third reference plane R3 and the first virtual line A2 is defined as a first virtual intersection point A3. FIG. 8 shows the second virtual intersection B3, which is the intersection of the second virtual line B2 and the third reference plane R3, along the first reference plane R1 from the first virtual end point A1 side along the axial center line. The state seen toward H is shown. In FIG. 8, the first reference plane R1 and the second reference plane R2 appear linear as indicated by the two-dot chain line. In FIG. 8, a line R3 ′ included in the third reference plane R3 is indicated by a dotted line. The line R3 ′ is a line on the third reference plane R3 and includes the second virtual intersection B3 and is parallel to the second line 142.

  FIG. 10 illustrates a third virtual intersection C3, which is an intersection of the third virtual line C2 and the third reference plane R3, along the first reference plane R1 from the first virtual endpoint A1 side. The state seen toward H is shown. FIG. 12 shows the fourth virtual intersection E3, which is the intersection of the fourth virtual line E2 and the third reference plane R3, along the first reference plane R1 from the first virtual endpoint A1 side. The state seen toward H is shown.

  As shown in FIG. 8, the length from the second virtual end point B1 to the second virtual intersection B3 is defined as a second virtual length B4. As shown in FIG. 10, the length from the third virtual end point C1 to the third virtual intersection C3 is defined as a third virtual length C4. As shown in FIG. 12, the length from the fourth virtual end point E1 to the fourth virtual intersection E3 is defined as a fourth virtual length E4.

  The second to fourth virtual intersections B3 to E3 change according to the rotation angle γ of the third reference plane R3 with respect to the second reference plane R2. By calculating the rotation angle γ of the third reference plane R3 in which the total length of the second virtual length B4 and the fourth virtual length E4 and the third virtual length C4 are equal, The four virtual intersections B3 to E3 become the contact points E with the second and third end points B and C.

  That is, in this state, the second to fourth virtual lengths B4 to E4 become the second to fourth lengths K2 to K4, the second and third end points B and C with respect to the first end point A, and the contact point The position with E can be determined.

  Thereby, the engagement surface 41 becomes a flat surface having an inclination in which disengagement with the engagement surface 41 of the counterpart coupler 10a is suppressed. That is, the inclination angle α of the second reference plane R2 with respect to the first reference plane R1 is provided to prevent the coupling between the couplers 10a from being easily released. The angle α is determined in consideration so that the coupling between the couplers 10a is not easily disengaged.

  In the present embodiment, since the third reference plane R3 includes the first virtual end point A1, the first virtual intersection A3 is the same point as the first virtual end point A1. For this reason, the first virtual length A4 that is the length from the first virtual end point A1 to the first virtual intersection A3 is zero.

  In order to obtain the second to fourth virtual lengths B4 to E4, the length from the axial center line H to the outer edge of the locking collar portion 40 is set to m as shown in FIG. The length from the axial center line H to the inner edge of the locking hook 40 is n. That is, m is the length from the axis H to the first and third virtual end points A1 and C1. n is the length from the axis H to the second and fourth virtual end points B1 and E1.

  As shown in FIG. 8, (second virtual length B4) = (second pre-rotation length B6) + (second post-rotation length B7). “Before rotation” means before the third reference plane R3 is rotated by the angle γ, that is, the value of the angle γ is zero. This is when the third reference plane R3 is the same plane as the second reference plane R2. Further, “after rotation” means that the third reference plane R3 is rotated by an angle γ.

  The second pre-rotation length B6 is a length from the second intermediate intersection B5 to the second virtual end point B1. The second intermediate intersection B5 is an intersection between the second reference plane R2 and the second imaginary line B2. The second reference plane R2 includes the second virtual end point B1. For this reason, the second virtual end point B1 and the second intermediate intersection point B5 are the same point, and therefore the second pre-rotation length B6 is zero. The second post-rotation length B7 is a length from the second intermediate intersection B5 to the second virtual intersection B3. Therefore, (second virtual length B4) = (second post-rotation length B7).

FIG. 9 shows a state in which FIG. 8 is viewed from the direction of the arrow Q1 along the second reference plane R2. In FIG. 9, the second reference plane R2 and the third reference plane R3 appear linear as indicated by a two-dot chain line. The first perpendicular line 100 is lowered from the second virtual intersection B3 to the second reference plane R2. As shown in FIG. 9, the length from the first virtual line A2 to the second virtual line B2 is mn. Therefore, the length 100a of the first perpendicular 100 is

  It becomes.

As shown in FIG. 8, the second virtual length B4 is

So

  It becomes.

  As shown in FIG. 10, (third virtual length C4) = (third pre-rotation length C6) + (third post-rotation length C7). The third pre-rotation length C6 is a length from the third intermediate intersection C5 to the third virtual end point C1. The third intermediate intersection C5 is an intersection between the second reference plane R2 and the third imaginary line C2. The third post-rotation length C7 is a length from the third intermediate intersection C5 to the third virtual intersection C3.

  As shown in FIG. 10, the third virtual line C <b> 2 is projected in a direction in which the first virtual side 56 extends on a virtual plane that includes the second virtual line B <b> 2 and is perpendicular to the first virtual side 56. In this case, the length from the projection line of the third virtual line C2 to the second virtual line B2 is m × sin (β) as described below. On the first reference plane R1 in FIG. 7, the intersection point when the perpendicular from the third virtual end point C1 to the first line 141 is taken as Cy, and the intersection point of the first reference plane R1 and the axis H Is O, the length of the side OC1 of the triangle formed by the third virtual end point C1, the intersection point Cy, and the intersection point O (the length from the third virtual end point C1 to the intersection point O) is m. Since the angle between the side C1O (side from the third virtual end point C1 to the intersection point O) and the side CyO (side from the intersection point Cy to the intersection point O) is β, the side C1Cy (from the third virtual end point C1 to the intersection point Cy) Is a length of m × sin (β).

Therefore, the third pre-rotation length C6 is

  It becomes.

  FIG. 11 shows a state in which FIG. 10 is viewed from the direction of the arrow Q2 along the second reference plane R2. The second perpendicular line 101 is dropped from the third virtual intersection C3 to the second reference plane R2.

  As shown in FIG. 11, when the third virtual line C2 is projected on the reference plane including the first virtual end point A1 and the axis H, the first virtual line is projected from the projection line of the third virtual line C2. The length to the line A2 is m− {m × cos (β)} as follows.

  In FIG. 7, the length of a triangle side C1O (side from the third virtual end point C1 to the intersection point O) formed by the third virtual end point C1, the intersection point Cy, and the intersection point O on the first reference plane R1. Is m. Since the intersection angle between the side C1O (side from the third virtual end point C1 to the intersection point O) and the side OCy (side from the intersection point O to the intersection point Cy) is β, the side OCy (side from the intersection point O to the intersection point Cy) Is m × cos (β).

The length 101a of the second perpendicular 101 is

It becomes. As shown in FIG.

It is. Therefore,

  It becomes.

Since (third virtual length C4) = (third pre-rotation length C6) + (third post-rotation length C7),

  It becomes.

  As shown in FIG. 12, (fourth virtual length E4) = (fourth pre-rotation length E6) + (fourth post-rotation length E7). The fourth pre-rotation length E6 is a length from the fourth intermediate intersection E5 to the fourth virtual end point E1. The fourth intermediate intersection point E5 is an intersection point between the second reference plane R2 and the fourth virtual line E2. The fourth post-rotation length E7 is a length from the fourth intermediate intersection E5 to the fourth virtual intersection E3.

  As shown in FIG. 12, when the fourth virtual line E2 is projected in a direction in which the first virtual side 56 extends on a reference plane that includes the second virtual line B2 and is perpendicular to the first virtual side 56 The length between the projection line of the fourth virtual line E2 and the second virtual line B2 is n × sin (β) as follows.

  On the first reference plane R1 in FIG. 7, when the intersection point when the perpendicular line is lowered from the fourth virtual end point E1 to the first line 141 is Cx, the fourth virtual end point E1, the intersection point Cx, the intersection point O, The length of the side OE1 of the triangle formed by (the length from the fourth virtual end point E1 to the intersection point O) is n. Since the angle between the side E1O (side from the fourth virtual endpoint E1 to the intersection O) and the side CXO (side from the intersection Cx to the intersection O) is β, the side E1Cx (from the fourth virtual endpoint E1 to the intersection Cx) Is a length of n × sin (β).

The fourth pre-rotation length E6 is

  It becomes. FIG. 13 shows a state in which FIG. 12 is viewed from the direction of the arrow Q3 along the second reference plane R2. The third perpendicular line 102 is lowered from the fourth virtual intersection point E3 to the second reference plane R2.

  As shown in FIG. 13, when the fourth imaginary line E2 is projected onto a reference plane including the first imaginary end point A1 and the axial center line H, the projection line of the fourth imaginary line E2 and the first imaginary line The length between the line A 2, that is, the length from the intersection Cx to the first virtual end point A 1 is m− {n × cos (β)}.

Therefore, the length 102a of the third perpendicular 102 is

  It becomes.

As shown in FIG. 12, the fourth post-rotation length E7 is

It is. Therefore,

It becomes. Since (fourth virtual length E4) = (fourth pre-rotation length E6) + (fourth post-rotation length E7),

  It becomes.

Next, an angle γ such that (third virtual length C4) = (second virtual length B4) + (fourth virtual length E4) is obtained.

It becomes.

When this formula is further organized,

When this formula is further organized,

When this formula is further organized,

It becomes.

When this formula is further organized,

Solving this equation for tan (γ),

  It becomes.

That means

It becomes.

  By substituting the obtained angles into the expressions representing the second to fourth virtual lengths B4 to E4, the second length K2 from the first end point A, the third length K3, A length K4 of 4 is obtained. Therefore, by determining the virtual point 120, the surface on which the contact portion 41a is to be formed is determined based on K2 to K4, and the engagement surface 41 is formed. As shown in FIG. 5, in the fourth end point D, the first side 42 and the second side 43 are parallel to each other when the engagement surface 41 is viewed along the axial center line H direction. Thus, it is formed by expanding the contact portion 41a.

As shown in FIG. 14, when the first side surface 31 is viewed from the front, the engagement surface 41 has the axial center line H side of the coupler 10 a in the protruding direction of the convex portion 30.

  Tilt.

  As shown in FIG. 15, a biasing mechanism 70 is provided on the side portion of the convex portion 30 on the second side surface 32 side. The biasing mechanism 70 biases the engaging hooks 40 facing each other in a direction to engage each other when the convex portion 30 is accommodated in the concave portion 33 of the counterpart coupler 10a.

  As an example, the urging mechanism 70 includes a cylindrical case member 71, a steel ball 72 housed in the case member 71 so as to protrude and retract, and a spring 73 that urges the steel ball 72 in the protruding direction. Embedded in the side portion on the second side surface 32 side. A part of the steel ball 72 protrudes from the second side surface 32.

  When the convex portion 30 of one coupler 10a is accommodated in the concave portion 33 of the other coupler 10a, the steel ball 72 of the urging mechanism 70 of the one coupler 10a is replaced with the steel of the urging mechanism 70 of the other coupler 10a. It contacts the sphere 72. For this reason, each coupler 10a is urged | biased by the urging | biasing mechanism 70 around the axial line H in the direction which each latching hook part 40 engages.

  Further, the second side surface 32 is inclined with respect to the axial center line H so as to face the protruding direction of the convex portion 30. For this reason, the urging force of each urging mechanism 70 acts also in the direction which separates each coupler 10a. This urging force acts in a direction in which the respective engagement surfaces 41 are pressed against each other in a state in which the respective locking hooks 40 are engaged with each other, making it difficult to release the engagement state between the respective locking hooks. ing.

  Next, the operation at the time of coupling of the couplers 10a will be described. First, as shown in FIG. 1, the end faces of the couplers 10a are made to face each other, and the axis H of each coupler 10a is aligned. And the convex part 30 of one coupler 10a and the recessed part 33 of the other coupler 10a are made to oppose, and the concave part 33 of one coupler 10a is made to oppose the convex part 30 of the other coupler 10a.

  Next, each convex portion 30 is pushed into the concave portion 33 of the counterpart coupler 10a. When each convex portion 30 is pushed into the counterpart concave portion 33, first, the steel balls 72 of the urging mechanisms 70 of each other come into contact with each other. As a result, the engaging hooks 40 of the couplers 10a are urged in the direction in which they engage with each other. For this reason, the guide surface 31a abuts on the guide surface 31a of the counterpart coupler 10a.

  Each guide surface 31a is a surface including the axial line H on its extension. For this reason, the reaction force against the urging force of the urging mechanism 70 acting between the guide surface 31a of one coupler 10a and the guide surface 31a of the other coupler 10a is directed in the direction toward the axis H, that is, in the radial direction. There is no component force to act.

  Therefore, during the attaching / detaching operation between the couplers 10a, the axial center line of each coupler 10a is prevented from shifting, and the smoothness of the attaching / detaching operation is not impaired. In this state, when the convex portion 30 is further pushed into the concave portion 33 of the counterpart coupler 10a, as shown in FIG. 16, the second end point B of one coupler 10a and the second end point B of the other coupler 10a. And abut.

  When each convex part 30 is further pushed into the concave part 33 of the mating coupler 10a, as shown in FIG. 17, the locking collar part 40 of one coupler 10a and the locking collar part 40 of the other coupler 10a are separated. At the moment of engagement, the first end point A of one coupler 10a and the first end point A of the other coupler 10a abut.

  In this way, when the locking hook 40 of one coupler 10a and the locking hook 40 of the other coupler 10a are engaged, the second end point B of the one coupler 10a and the second coupler 10a of the second coupler 10a. The first side of one of the couplers 10a until the first end point A of one of the couplers 10a and the first end point A of the other coupler 10a are in contact with each other. The side 42 intersects with the first side 42 of the other coupler 10a.

  As shown in FIG. 6, when the convex portion 30 is further pushed into the counterpart concave portion 33, the first end point A of one coupler 10a gets over the first end point A of the other coupler 10a. Then, the couplers 10a are relatively rotated by the angle β by the biasing force of the biasing mechanism 70, and the locking collars 40 are engaged with each other. Thereby, as shown in FIG. 3, each coupler 10a couple | bonds together.

  When releasing the coupling between the couplers 10a, first, the couplers 10a are resisted against the urging force of the urging mechanism 70 in the direction in which the engagement hooks 40 are disengaged around the axis H. Rotate relatively. Thereby, each coupler 10a is relatively pressed in the direction which adjoins mutually in the axial center line H direction. By being pressed, the first end point A of the engagement surface 41 of each coupler 10a gets over the first end point A of the mating coupler 10a, and the engagement between the locking hooks 40 is released. The coupling between the couplers 10a is released.

  Next, a method for manufacturing the coupler 10a will be described. As shown in FIG. 18, the coupler 10 a is manufactured by a universal milling machine 110. The universal milling machine 110 includes a table 111, a fixing means 200, a machining head 113, and a tool 114 for cutting a workpiece 115 as a material of the coupler 10a.

  The work 115 has a cylindrical shape, and one end portion is a first end portion 115b referred to in the present invention, and the other end portion is a second end portion 115c referred to in the present invention.

  The table 111 can reciprocate in the first direction X and the second direction Y as shown in the figure. The second direction Y is perpendicular to the first direction X.

  The fixing means 200 includes a table 201, an index 112, and a chuck 202. The index 112 is fixed to the table 201. The chuck 202 is attached to the tip of the index 112. The chuck 202 holds the workpiece 115. As indicated by an arrow T in FIG. 19, the index 112 allows the workpiece 115 to freely rotate about its axis, and fixes the workpiece 115 in its posture after rotating.

  The table 111 is positioned below the machining head 113 and can reciprocate in the third direction Z toward the workpiece 115. The third direction Z is a direction perpendicular to the first direction X and the second direction Y.

  As described above, the table 111 is movable in the first, second, and third directions X, Y, and Z, so that the table 111 and the processing head 113 are moved in the first, second, and third directions X, It can move relatively to Y and Z.

  The machining head 113 holds the tool 114. Further, the machining head 113 is inclined with respect to the third direction Z in a plane perpendicular to the second direction Y, whereby the axial center line 114a of the tool 114 is inclined with respect to the third direction Z. Can do.

  First, the second end 115 c of the work 115 is held by the chuck 202. Next, the posture of the table 201 is adjusted so that the axis 115a of the workpiece 115 is along the first direction X. Further, the tool 114 is held by the machining head 113 and the attitude of the machining head 113 is adjusted so that the axial center line 114 a of the tool 114 is along the third direction Z.

  Next, by moving the table 111 in the first direction X and the second direction Y, the workpiece 115 is moved relative to the tool 114, and the cutting line Q of the tool 114 is changed to the convex portion 30 and the concave portion 33. The convex portion 30 and the concave portion 33 are formed in the first end portion 115b by moving along the contour.

  The cutting line Q is demonstrated using FIG. 20 and FIG. FIG. 20 is a cross-sectional view showing a state in which the tool 114 is cutting the workpiece 115 with a part cut away. A range surrounded by the hatching of the two-point difference line shown in FIG. 20 is a contact range W between the tool 114 and the workpiece 115. FIG. 21 is a cross-sectional view of the state in which the tool 114 is cutting the workpiece 115 so as to cross the axial center line 114a of the tool 114 vertically.

  The cutting line Q of the tool 114 is a line connecting the tips of the cuts in the radial direction to the workpiece 115 in the tool 114. In other words, in the contact range W of the tool 114 with the workpiece 115, it is the edge on the cutting side perpendicular to the traveling direction of the tool 114 indicated by the arrow in the figure. In the drawing, the tool 114 is exaggerated and enlarged.

  When forming the first side surface 31, for example, first, the guide surface 31 a is formed by moving the table 111 in the first direction X. Thereby, the guide surface 31a is formed in the surface containing the axial line H on the extension. After the guide surface 31a is formed, the table 111 is moved by a predetermined distance in the second direction Y, and as shown in FIG. 19, an outer frame with a finishing allowance (extra margin) is formed on the locking collar 40. . Thereafter, the index 112 is rotated by an angle β, and then the table 111 is moved again in the first direction X to form the remaining first side surface 31.

  When forming the bottom end of the recess 33 or the second side surface 32, for example, after changing the posture of the table 201 so that the bottom end of the recess 33 or the second side surface 32 is along the second direction Y, for example. By moving the table 111 in the second direction Y, the bottom end of the recess 33 and the second side surface 32 are formed.

  Next, the engagement surface 41 is formed. When the engagement surface 41 is formed, as shown in FIG. 21, the base 201 and the processing head 113 are arranged so that the engagement surface 41 that is not yet formed and indicated by the two-dot chain line is along the second direction Y. Adjust the posture.

  Specifically, the axial line 115a of the workpiece 115 is in the first direction so that the engagement surface 41 to be formed is parallel to a plane defined by the second direction Y and the third direction Z. The posture of the table 201 is adjusted so that the angle α is inclined with respect to X.

Further, the axial center line 114a of the tool 114 is in the third direction Z so that the tip 114b of the tool 114 approaches the tip 115d of the first end 115b.

  The posture of the machining head 113 is adjusted so as to be inclined.

  When each of the above adjustments is completed, the tool 114 is placed along the location where the first side 42 is to be formed. Then, by moving the table 111 in the first direction X, the cutting amount of the tool 114 with respect to the workpiece 115 is adjusted. When the adjustment of the cutting amount of the tool 114 with respect to the workpiece 115 is completed, the engagement surface 41 is processed by moving the table 111 in the second direction Y. By forming the engagement surface 41 in this way, as shown in FIG. 5, the second side 43 is parallel to the first side surface 31 in the state where the distal end surface 15 is viewed in the direction of the axis H. become.

  The guide surface 31a of the convex portion 30 formed as described above is formed on a surface including the axial line H on the extension. For this reason, the smoothness of the attaching / detaching operation between the couplers 10a is maintained. The contact portions 41a of the engagement surface 41 are in surface contact with each other. For this reason, the engagement surface 41 has sufficient durability. The engagement surface 41 has an inclination that suppresses the engagement between the locking hooks 40 from being released. For this reason, it is suppressed that coupling | bonding of each coupler 10a is cancelled | released unexpectedly and each coupler 10a falls out. The contact portion 41a is formed on a plane that is in surface contact with each other. For this reason, the engagement surface 41 can be formed by the universal milling machine 110 that controls one axis at a time without using an expensive machining center capable of simultaneous multi-axis control.

  Therefore, it is possible to manufacture the coupling device 10 at a reduced cost while maintaining smoothness of the attaching / detaching operation, a retaining function, and sufficient durability of the engaging surface.

  Further, in the state in which the engagement surface 41 is viewed in the direction of the axis H, the engagement surface 41 has the first side 42 and the second side 43 parallel to each other. For this reason, when the engagement surface 41 is formed, it is only necessary to move the table 111 in the second direction Y. Therefore, the engagement surface 41 can be formed easily.

  Moreover, in this embodiment, although the engaging surface 41 is formed after forming the one recessed part 33, it is not limited to this. For example, the engagement surface 41 may be formed after all the recesses 33 are formed.

  In the universal milling machine 110, the table 111 moves in the first and second directions X and Y, and the processing head 113 moves in the third direction Z. However, the present invention is not limited to this. For example, the table 111 may move in the third direction Z. In short, it is sufficient that the tool 114 is movable relative to the workpiece 115.

  In addition, in order to make operability smoother, the corner portion where the first side surface 31 and the engagement surface 41 intersect may be chamfered by a curved surface or a flat surface. Further, since the engaging surface 41 is a flat surface, the coupler 10 can be easily manufactured by forging or casting.

  Moreover, as shown in FIG. 22, the coupler main body 11 and the convex part 30 may be formed independently, and the coupler 10a may be formed by assembling these. An example of this point will be described.

  The convex portion 30 is formed separately from the coupler main body 11. The convex portion 30 has a unit shape composed of a plurality of pieces, for example. The unit 301 includes a plurality of convex portions 30 and a base portion 312 that integrates the plurality of convex portions 30 together. Each convex part 30 and the base 312 are integrally formed. Note that the unit 301 may have a structure having one protrusion 30 instead of the plurality of protrusions 30.

  The base 312 has an inner peripheral surface 302 that contacts the outer peripheral surface of the coupler main body 11 and an outer peripheral surface 303. The outer peripheral surface 303 is inclined so as to approach the inner peripheral surface 302 as the distance from the convex portion 30 increases along the axis of the coupler main body 11.

  The coupler body 11 has an overhang 304 that protrudes outward from the outer peripheral surface 310 at the tip of the coupler body 11 so that the unit 301 does not come off in the axial direction.

  The fixing member 300 is a cylindrical member. The fixing member 300 sandwiches the plurality of units 301 between the outer peripheral surface 310 of the coupler main body 11 and the unit 301 between the overhanging 304.

  Therefore, the fixing member 300 includes a peripheral wall 309 for sandwiching the base 312 of the unit 301 between the coupler body 11 and an overhang 305 for sandwiching the base 312 of the unit 301 between the overhang 304. Have.

  A part of the distal end surface of the base 312 is in contact with the overhang 304. The rear end surface of the base 312 is in contact with the overhang 305. The distal end surface of the base 312 is an end surface on the side where the convex portion 30 is disposed in the base 312. The rear end surface is a surface opposite to the front end surface.

  The overhang 305 protrudes inward. A female screw portion 307 is formed on the inner peripheral portion of the overhang 305. On the outer peripheral portion of the coupler main body 11, a male screw portion 308 that is screwed with the female screw portion 307 is formed.

  The inner peripheral surface 311 of the peripheral wall portion 309 is inclined so as to come into surface contact with the tapered outer peripheral surface 303 of the unit 301.

  The fixing member 300 is fixed to the coupler main body 11 by the female screw portion 307 and the male screw portion 308 being screwed together. Further, the plurality of units 301 are fixed to the coupler body 11 by fixing the fixing member 300 to the coupler body 11.

  The structure in which the coupler main body 11 and the convex portion 30 are separately formed is not limited to the above structure. In short, the present invention is effective even when the coupler 10a has a structure configured by combining the coupler body 11 and the convex portion 30 that are separately formed.

1 is a perspective view of a coupling device according to a first embodiment of the present invention. The front view which shows the front end surface of the front-end | tip part of the main-body part shown by FIG. The perspective view which shows the state which the main-body parts shown by FIG. 1 couple | bonded together. The perspective view which expands and shows a part of convex part shown by FIG. The front view which expands and shows a part of front end surface of the front-end | tip part shown by FIG. The perspective view which shows the state which the convex part shown by FIG. 1 engaged with the convex part of the other party main body part. The figure which shows each relationship with the contact range of a 1st reference plane, a 2nd reference plane, a 3rd reference plane, and an engagement surface. The figure which shows the state which looked at the 2nd virtual intersection from the 1st virtual endpoint side toward the axial line H along the 1st reference plane. The figure which shows the state which looked at FIG. 8 from the direction of the arrow along the 2nd reference plane. The figure which shows the state which looked at the 3rd virtual intersection from the 1st virtual endpoint side toward the axial center line along the 1st reference plane. The figure which shows the state which looked at FIG. 10 from the direction of the arrow along the 2nd reference plane. The figure which shows the state which looked at the 4th virtual intersection from the 1st virtual endpoint side toward the axial center line along the 1st reference plane. The figure which shows the state which looked at FIG. 12 from the direction of the arrow along the 2nd reference plane. The front view of the 1st side surface shown by FIG. The figure which expands and shows F15 shown by FIG. The perspective view which shows the state in the middle of the latching collar part shown by FIG. 1 engaging with the latching collar part of the other party main body part. The perspective view which shows the state in the middle of the latching collar part shown by FIG. 1 engaging with the latching collar part of the other party main body part. The perspective view which shows the universal milling machine which manufactures the coupling device which concerns on this invention. The perspective view which shows the state which forms an engagement surface from the workpiece | work shown by FIG. Sectional drawing which shows a state where a tool cuts a workpiece | work partially cut out. Sectional drawing which cut | disconnected the mode that the tool is cutting the workpiece | work so that the axial center line of a tool might be perpendicularly crossed. Sectional drawing which shows the form which can isolate | separate a coupler main body and a convex part.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 6 ... Fitting part, 10 ... Coupling device, 10a ... Coupler, 11 ... Coupler main body, 11b ... Tip part, 30 ... Convex part, 31a ... Guide surface, 33 ... Concave surface, 41 ... Engagement surface, 41a ... Contact part, 42 ... first side (guide surface side), 43 ... second side, 56 ... first virtual side, 57 ... second virtual side, 110 ... universal milling machine, 111 ... table, DESCRIPTION OF SYMBOLS 112 ... Index, 113 ... Processing head, 114 ... Tool, 115 ... Workpiece, 115b ... First end, 115c ... Second end, 115d ... Tip, 140 ... Line (back side), 141 ... First 1, 142 ... 2nd line, H ... axial center line, K ... reference circle, R1 ... first reference plane (reference plane), R2 ... second reference plane, A ... first end point (first 1 contact portion end point), B ... second end point (second contact portion end point), C ... third end point (third contact portion end point), ... Abutting point (fourth contact portion end point), A2 ... first imaginary line, B2 ... second imaginary line, C2 ... third imaginary line, E2 ... fourth imaginary line, Q ... cutting line, X ... 1st direction, Y ... 2nd direction, Z ... 3rd direction.

Claims (5)

A coupling device comprising a pair of cylindrical couplers of the same shape that are detachably coupled to each other in the axial direction that is a straight line,
The coupler is
A tubular coupler body;
A fitting portion that includes recesses and projections provided alternately at the tip of the coupler body along a reference circle around the axis, and is fitted to each other;
A guide surface that is formed on the convex portion along a plane including the axis, and guides the fitting between the fitting portions when the pair of couplers is attached and detached.
An engaging surface having contact portions formed on the convex portion and in surface contact with each other in a direction in which the pair of engaged couplers are separated from each other in the axial direction;
With
The engagement surface is
Formed on a plane inclined in the protruding direction of the convex portion from the first side of the engaging surface on the guide surface side to the second side of the back side along the reference circle. Feature coupling device. A first extending from the first contact portion end point located outside the reference circle on the guide surface side edge of the contact portion on the guide portion side, including the first contact portion end point and extending in parallel with the axis. The length to the intersection of the imaginary line and the reference plane orthogonal to the axis is the first length K1,
A second imaginary line including the second contact portion end point and extending in parallel with the axial center line from the second contact portion end point located inside the reference circle on the guide surface side side; and the reference plane; The length to the intersection of the second length K2,
From the third contact portion end point located outside the reference circle on the back side side on the back side along the reference circle in the contact portion, including the third contact portion end point and in parallel with the axial line The length to the intersection of the extending third imaginary line and the reference plane is the third length K3,
A fourth imaginary line including the fourth contact portion end point and extending in parallel with the axial center line from the fourth contact portion end point located inside the reference circle on the back side side and the reference plane If the length to the intersection is the fourth length K4,
The engagement surface is

The coupling device according to claim 1, wherein the coupling device is formed in a flat plane. While the guide surface side edge on the guide surface side in the contact portion and the back side edge on the back side along the reference circle in the contact portion, the respective extension lines intersect the axis line, On the first reference plane that includes the end point of the first side located outside the reference circle and is orthogonal to the axis, the guide surface side side and the back side side are centered on the axis. The first virtual side and the second virtual side projected in the line direction are formed on a line intersecting at an angle β on the axis.
The engagement surface is
A second reference plane including a first line that includes an end point of the first side edge and is orthogonal to the axial center line, and the second virtual side side is the first reference plane with respect to the first reference plane. An end point of the first side that is a second line of the second reference plane that is inclined by an angle α in the protruding direction of the convex portion from the imaginary side of 1 and that is included in the second reference plane. Including the second line perpendicular to the first side and the axial line side, and the second line as a rotation axis on the protruding side of the convex part in the axial line direction,

The coupling device according to claim 1, wherein the coupling device is formed on an inclined third reference plane.   4. The device according to claim 1, wherein the second side is formed in parallel with the guide surface when the engagement surface is viewed from the axial direction. The coupling device according to item. A pair of cylindrical couplers of the same shape that are detachably coupled to each other in the direction of the axial line that is a straight line,
The coupler is
A tubular coupler body;
A fitting portion that includes recesses and projections provided alternately at the tip of the coupler body along a reference circle around the axis, and is fitted to each other;
A guide surface that is formed on the convex portion along a plane including the axis, and guides the fitting between the fitting portions when the pair of couplers is attached and detached.
An engagement surface that is a flat surface having contact portions formed on the convex portions and in surface contact with each other in a direction in which the pair of engaged couplers are separated from each other in the axial direction;
With
While the guide surface side edge on the guide surface side in the contact portion and the back side edge on the back side along the reference circle in the contact portion, the respective extension lines intersect the axis line, On the first reference plane that includes an end point located outside the reference circle on the first side of the engagement surface on the guide surface side and is orthogonal to the axial center line, the guide surface side side and the side A first imaginary side and a second imaginary side which are projected in the axial direction along the back side are formed in a line intersecting at an angle β on the axis.
The engagement surface is
A second reference plane including a first line that includes an end point of the first side edge and is orthogonal to the axial center line, and the second virtual side side is the first reference plane with respect to the first reference plane. An end point of the first side that is a second line of the second reference plane that is inclined by an angle α in the protruding direction of the convex portion from the imaginary side of 1 and that is included in the second reference plane. Including the second line perpendicular to the first side and the axial line side, and the second line as a rotation axis on the protruding side of the convex part in the axial line direction,

A manufacturing method of a coupling device formed on an inclined third reference plane,
A tool for cutting a workpiece as a material of the coupler having a first end where the fitting portion is formed and a second end opposite to the first end;
A table to which the workpiece is fixed;
Fixing means for fixing the workpiece to the table;
A machining head for holding the tool;
Comprising
The processing head and the table include a third direction along a direction away from and a direction approaching each other, a first direction perpendicular to the third direction, and both directions of the third direction and the first direction. Relative to a second direction perpendicular to the
The fixing means fixes the workpiece to the table in a state where the axis of the workpiece is inclined with respect to the first direction within a plane defined by the first direction and the second direction. Is possible,
A universal milling machine in which the machining head can change its posture in a state in which the axial center line of the tool is inclined with respect to the third direction within a plane defined by the third direction and the first direction. Use
After forming the guide surface at the first end by moving the cutting line of the tool along the contour of the convex portion,
The engagement surface to be formed is parallel to a plane defined by the second axis and the third axis with respect to the axis of the workpiece with respect to the first axial direction. The angle α is inclined, and the angle of the tool so that the tip of the tool approaches the tip of the first end with respect to the third axis with respect to the third axis.

The coupling device is formed by tilting and positioning the tool at a position where the engagement surface is to be formed, and then forming the engagement surface by moving the workpiece in the second direction. Method.

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