JP7180648B2 - holding pot - Google Patents

Description

The present invention relates to a holding pot that removably holds a member to be held such as a tool or a work.

Conventionally, as an example of a holding pot provided in a tool magazine of a machine tool to removably hold a member to be held such as a tool, for example, a tool pot described in Patent Document 1 is known. This tool pot has a hollow cylindrical pot body, and a flange portion having a larger diameter than the pot body is formed at one axial end of the pot body. In addition, an annular supporting member formed in a conical shape with an inner peripheral surface gradually decreasing in diameter toward the inner peripheral surface is attached by adhesion or the like to the inner depth of the insertion hole formed by the inner peripheral surface of the pot body. there is

On the other hand, the tool holder, which is a member to be held, has a flange part in the middle of its length direction, and a tool pot is provided on the side opposite to the side where the tool is provided with the flange part as a boundary in the length direction. It has a shank portion that is inserted into the insertion hole. The shank portion is formed in a truncated cone shape with a smaller diameter toward the distal end side so that the cross-sectional shape on the distal end side is smaller than the cross-sectional shape on the proximal end side. When the tool holder is not in use, the shank portion is inserted into the insertion hole of the pot body of the tool pot, and the flange portion is held in contact with the flange portion of the pot body. be.

In this case, at the inner depth of the insertion hole of the pot body, the conical inner peripheral surface of the annular support member faces the outer peripheral surface of the distal end portion of the shank portion having the truncated cone shape. They come into contact and stick together. For this reason, the tool holder, which is the member to be held, is held in the tool pot, which is the holding pot, and even if a moment in the direction intersecting the central axis acts, an annular ring that is in close contact with the shank portion at the inner depth of the insertion hole. is held so as not to incline by the supporting member. That is, since the inner peripheral surface of the annular support member is in surface contact with the outer peripheral surface of the shank at the inner depth of the insertion hole, the tool holder held by the tool pot is in close contact with the outer peripheral surface of the shank, so that the tool holder is unstable. hard to become

JP 2005-313256 A

By the way, an external force may act on the tool holder held in the tool pot, for example, in the direction of rotation about the central axis. In that case, there is a risk that the tool holder will be displaced in the rotational direction with respect to the tool pot. Therefore, in recent years, the cross-sectional shape of the shank portion of the tool holder and the cross-sectional shape of the insertion hole of the tool pot are not circular but polygonal such as triangular so that the tool can be held in the tool pot. It has also been practiced to restrain the rotation of certain tool holders.

Here, when the cross-sectional shape of the shank portion of the tool holder and the cross-sectional shape of the insertion hole of the tool pot are polygonal such as triangular, the cross-sectional shape of the ring-shaped support member attached to the innermost part of the insertion hole is similarly polygonal. need to be shaped. Furthermore, in this case, the shape of the shank portion of the tool holder also becomes a truncated pyramidal shape whose cross-sectional area decreases toward the tip side, so that the inner peripheral surface of the polygonal annular support member is also the outer periphery of the truncated pyramidal shape of the shank portion. It is necessary to form a pyramid surface shape that can come into surface contact with and adhere to the surface.

However, forming the shank portion of the tool holder into a truncated pyramid shape whose cross-sectional area decreases toward the tip side is still not enough. It is not easy to form the inner peripheral surface of the . Therefore, due to the difficulty of the forming work related to such a tool pot, there is a problem that the stabilization of holding of the tool holder, which is a member to be held, against the tool pot cannot be easily realized.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a holding pot capable of easily stabilizing holding of a member to be held such as a tool or a workpiece.

Means for solving the above problems and their effects will be described below.
A holding pot that solves the above problems is a holding pot that has an insertion hole along one direction and holds the member to be held by inserting an insertion portion of the member to be held into the insertion hole, wherein the insertion In the hole, the shape of the opening edge on the side into which the insertion portion is inserted and withdrawn in the axial direction of the insertion hole matches the cross-sectional shape of the base end portion of the insertion portion of the held member, and the inner depth of the insertion hole. The inner peripheral surface of the side is provided with an annular edge portion whose inner peripheral edge shape matches the shape of the circumscribed circle of the distal end side portion of the insertion portion of the held member.

According to this configuration, even if the shape of the insertion portion of the member to be held is, for example, a so-called polygonal tapered shape in which the cross-sectional shape gradually decreases from the base end side to the distal end side and the cross-sectional shape is a polygonal shape, the shape is The held member can be stably supported by suppressing inclination and rotation of the posture. That is, when the insertion portion of the held member having a so-called polygonal tapered shape is inserted into the insertion hole, the base end portion of the insertion portion is supported by the opening edge of the insertion hole, and the insertion portion is held at the inner depth side of the insertion hole. A distal portion of the insertion portion is supported by the annular edge portion. Therefore, the held member is supported at two positions, that is, the base end portion and the distal end side portion of the insertion portion, and is suppressed from tilting even if a moment acts in a direction intersecting the central axis. . In addition, since the base end of the insertion portion of the held member is fitted into the opening edge of the insertion hole having the same polygonal cross-sectional shape, the held member is prevented from being displaced by rotating in the direction of rotation about the central axis. is suppressed. Moreover, the annular edge portion that contacts the distal end portion of the insertion portion from the radially outer side on the inner depth side of the insertion hole does not come into surface contact with the outer surface of the distal end portion of the insertion portion, but has a plurality of edges. Make point contact at a point. Therefore, it is possible to deal with a plurality of types of held members having various so-called polygon tapered shapes such as a truncated triangular pyramid shape and a truncated quadrangular pyramid shape.

In the above holding pot, the annular edge portion has a smaller inner diameter at one point on the inner depth side of the inner peripheral surface of the insertion hole than at a point extending from the one point to the opening edge side of the insertion hole. It is preferable that they are integrally formed so as to be.

According to this configuration, it is not necessary to attach, for example, an annular separate member having an annular edge portion formed in advance on the inner peripheral edge to the inner peripheral surface of the insertion hole on the inner depth side by adhesion or the like. Therefore, the holding of the held member can be easily stabilized without increasing the number of members and the manufacturing process of the holding pot.

In the above-mentioned holding pot, the insertion hole is located closer to the opening edge than the edge portion in the axial direction, and the shape of the edge portion on the edge portion side is a circular shape with a larger diameter than the edge portion. and the shape of the end edge on the side of the first inner peripheral surface portion, which is axially located on the inner depth side of the insertion hole relative to the first inner peripheral surface portion and on the side of the first inner peripheral surface portion, is the same as that on the edge portion side of the first inner peripheral surface portion. a second inner peripheral surface portion having a circular shape with a smaller diameter than the shape of the edge, wherein the edge portion is configured by an edge-shaped edge of the second inner peripheral surface portion on the side of the first inner peripheral surface portion. It is preferable that

According to this configuration, the first inner peripheral surface portion and the second inner peripheral surface portion are formed on the inner peripheral surface of the insertion hole so that the second inner peripheral surface portion is located on the inner and deeper side of the insertion hole, An annular edge portion can be easily formed.

In the holding pot, the first inner peripheral surface portion and the second inner peripheral surface portion form a truncated cone inner surface shape in which the inner diameter gradually decreases from the first inner peripheral surface side to the second inner peripheral surface side. It is preferable that they are connected by a tapered inner peripheral surface portion.

According to this configuration, when the insertion portion of the member to be held is inserted into the insertion hole, the distal end portion of the insertion portion can be smoothly moved to the annular edge portion by the guide function of the tapered inner peripheral surface portion inside the insertion hole. I can guide you.

In the above-described holding pot, it is preferable that the insertion portion of the member to be held has a polygonal cross-sectional shape whose cross-sectional shape gradually decreases from the base end side toward the tip end side.
According to this configuration, it is possible to reduce the possibility that the held member whose insertion portion is inserted into the insertion hole is unnecessarily displaced in the rotational direction with respect to the holding pot.

According to the present invention, it is possible to easily stabilize holding of a held member such as a tool or a work.

The front view which shows the state by which the holding|maintenance pot of one Embodiment was supported by the conveyance chain. The front view which omitted a part of tool holder. Bottom view of the tool holder. 1 is a perspective view of a holding pot; FIG. Top view of the holding pot. 6 is a cross-sectional view taken along line 6-6 in FIG. 5; FIG. Bottom view of the holding pot. FIG. 4 is a front cross-sectional view showing a state in which a tool holder is held in a holding pot of a comparative example; FIG. 4 is a front cross-sectional view showing a state in which a tool holder is held in the holding pot of the present embodiment;

One embodiment of the holding pot will be described below with reference to the drawings.
As shown in FIG. 1, the holding pot 11 is supported by a conveying chain 12 that moves horizontally perpendicular to the vertical direction Z. As shown in FIG. The conveying chain 12 includes a plurality of pairs of inner link plates 13 each forming a pair in the vertical direction Z, and a plurality of pairs of outer link plates 14 arranged at positions sandwiching each pair of inner link plates 13 in the vertical direction Z from the outside. , and a cylindrical hollow pin 15 . The inner link plates 13 and the outer link plates 14 are rotatably connected by hollow pins 15 while being alternately arranged so that their ends overlap each other. A fixing ring groove 16 is formed along the entire circumference of the outer peripheral surface of the hollow pin 15 at a location outside the outer link plate 14 in the vertical direction Z. As shown in FIG. By fitting the fixing ring 17 into the fixing ring groove 16, the inner link plate 13 and the outer link plate 14 are prevented from coming off from the hollow pin 15. As shown in FIG.

As shown in FIGS. 2 and 3, the tool holder 20, which is an example of a member to be held that is removably held in the holding pot 11, has a flange part in the middle of the length direction, which is the vertical direction Z in FIG. 21. In addition, the tool holder 20 has a shank-shaped insertion portion 23 on the side opposite to the mounting portion 22 for tools such as drills and cutting blades with respect to the flange portion 21 in the longitudinal direction. ing. The insertion portion 23 is formed in a so-called polygonal tapered shape in which the cross-sectional shape gradually decreases from the base end side to the distal end side and the cross-sectional shape is polygonal. As an example, the insertion portion 23 in this embodiment has a substantially triangular cross-sectional shape with three curved sides 23a and three rounded vertices 23b, and the cross-sectional shape extends from the proximal side to the distal end. It is formed in a truncated triangular pyramid shape that gradually becomes smaller toward the side.

The flange portion 21 has a disk shape with a predetermined thickness in the longitudinal direction of the tool holder 20, and grip grooves 24 are formed at a plurality of locations on its outer peripheral surface. When the tool holder 20 is inserted into and removed from the holding pot 11 , the grip claws of an automatic tool changer (not shown) are engaged with the grip grooves 24 . A circular engagement hole 25 is formed in the distal end surface of the insertion portion 23 toward the proximal end side. In the middle of the engagement hole 25 in the depth direction, there is provided a ball for engaging an engagement ball (not shown) of the machine tool for retaining the tool holder 20 when the tool holder 20 is set in a machine tool such as a machining center. An engagement groove 26 is formed. A positioning groove 27 extending from the distal end surface of the inserting portion 23 toward the proximal end is formed at one location on the outer surface of the inserting portion 23 .

As shown in FIG. 4, the holding pot 11 has a hollow cylindrical pot body 30 . As shown in FIG. 1, the pot body 30 has a large-diameter tubular portion 31 located above and a small-diameter tubular portion 32 located below when supported by the conveying chain 12 . A flange portion 33 having an outer diameter larger than that of the large-diameter tubular portion 31 is formed at the end portion of the large-diameter tubular portion 31 on the opposite side of the small-diameter tubular portion 32 in the axial direction. As shown in FIG. 1 , the outer diameter of the large-diameter cylindrical portion 31 of the pot body 30 matches the inner diameter of the upper end of the hollow pin 15 , and the outer diameter of the flange portion 33 is larger than the outer diameter of the upper end of the hollow pin 15 . Therefore, as shown in FIG. 1, in the holding pot 11, the pot body 30 is inserted from above into the hollow pin 15 from the side of the small-diameter cylindrical portion 32, and the flange portion 33 is brought into contact with the upper end surface of the hollow pin 15. It is supported by the transport chain 12 in this state.

As shown in FIGS. 4 to 6, the pot body 30 has an insertion hole 34 along the axial direction, which is an example of one direction. In this specification, the term “axial direction” refers to the direction along the central axis A of the pot body 30 . The shape of the opening edge 35 of the insertion hole 34 on the side of the large-diameter cylindrical portion 31 matches the cross-sectional shape of the base end portion of the so-called polygon tapered insertion portion 23 of the tool holder 20 which is the member to be held. That is, as shown in FIG. 5, the opening edge 35 of the insertion hole 34 on the side of the large-diameter cylindrical portion 31 has a substantially triangular shape having three curved sides 35a and three rounded vertices 35b. None, the cross-sectional shape of the proximal end portion of the insertion portion 23 of the tool holder 20 is formed to be the same. Therefore, in the tool holder 20 , when the insertion portion 23 is inserted into the insertion hole 34 of the holding pot 11 , the substantially triangular base end portion of the insertion portion 23 is aligned with the substantially triangular opening edge 35 of the insertion hole 34 . On the other hand, the pot body 30 is fitted in such a manner that the rotation of the pot body 30 about the central axis A is restricted.

As shown in FIGS. 5 and 6, the insertion hole 34 has a plurality of inner peripheral surface portions 36, 37, 38, 39, 40 with different inner peripheral surface shapes. That is, the insertion hole 34 has a polygonal inner peripheral surface portion 36, a first inner peripheral surface portion 37, a tapered inner peripheral surface portion 38, a second inner peripheral surface portion 36, and a first inner peripheral surface portion 37 in order from the large diameter tubular portion 31 side to the small diameter tubular portion 32 side in the axial direction. The surface portion 39 and the stepped inner peripheral surface portion 40 are continuously formed. The opening edge 35 of the insertion hole 34 on the side where the insertion portion 23 of the tool holder 20 is inserted is formed by the edge of the polygonal inner peripheral surface portion 36 on the side opposite to the small-diameter cylindrical portion 32 side in the axial direction. On the other hand, the opening edge of the insertion hole 34 on the side opposite to the opening edge 35 side in the axial direction is formed by the edge of the stepped inner peripheral surface portion 40 on the side opposite to the large diameter cylindrical portion 31 side in the axial direction. .

The polygonal inner peripheral surface portion 36 is formed to have a substantially triangular cylindrical inner surface shape whose cross-sectional shape is substantially the same as the opening edge 35 of the insertion hole 34 over the entire axial direction. Therefore, when the so-called polygon tapered insertion portion 23 of the tool holder 20 is inserted into the insertion hole 34, the base end portion of the insertion portion 23 is fitted into the opening edge 35 of the polygonal inner peripheral surface portion 36, but the insertion portion The tip side portion of the base end portion of 23 does not come into contact with the polygonal inner peripheral surface portion 36 .

The first inner peripheral surface portion 37 has a first edge 41 that borders on the polygonal inner peripheral surface portion 36 in its axial direction and has a substantially triangular shape that is the same as the cross-sectional shape of the polygonal inner peripheral surface portion 36 in plan view. At the same time, when viewed from the side, the amplitude is formed so as to draw a sine curve in the axial direction. That is, the first edge 41 has a portion corresponding to each central portion of the three sides 35 a of the opening edge 35 closest to the opening edge 35 in the axial direction, and a portion corresponding to the three vertices 35 b of the opening edge 35 . Draw a sine curve that is closest to the small-diameter cylindrical portion 32 in the axial direction. On the other hand, as shown in FIG. 5, the shape of the second edge 42 that borders the tapered inner peripheral surface 38 in the axial direction of the first inner peripheral surface 37 is a substantially triangular circumscribed circle of the opening edge 35 . It is formed to have a circular shape that matches the shape of the Therefore, as shown in FIGS. 5 and 6, the surface shape of the region between the first edge 41 and the second edge 42 in the first inner peripheral surface portion 37 is a curved surface obliquely crossing the axial direction. shape.

The tapered inner peripheral surface portion 38 has a third edge 43 that borders the second inner peripheral surface portion 39 on the side opposite to the second edge 42 in the axial direction, and has a circular shape with a smaller diameter than the second edge 42 . is formed to form That is, the third edge 43 has a circular shape that matches the shape of the circumscribed circle C of the distal end side portion of the insertion portion 23 shown in FIG. ing. Therefore, as shown in FIG. 6, the surface shape of the area between the second edge 42 and the third edge 43 of the tapered inner peripheral surface portion 38 changes from the first inner peripheral surface portion 37 side to the second inner peripheral surface portion 39 side. It is formed to have a truncated cone inner surface shape in which the inner diameter gradually decreases toward the side.

As shown in FIG. 6 , the second inner peripheral surface portion 39 is positioned deeper inside the insertion hole 34 than the first inner peripheral surface portion 37 is. The second inner peripheral surface portion 39 has a fourth edge 44 on the side opposite to the third edge 43 in the axial direction and bordering on the stepped inner peripheral surface portion 40 . It is formed to have a shape. That is, the second inner peripheral surface portion 39 has a cylindrical inner surface shape whose cross-sectional shape is a circular shape that matches the shape of the circumscribed circle C of the tip side portion of the insertion portion 23 of the tool holder 20 over the entire axial direction. It is formed like an eggplant.

A third edge 43, which is an edge of the second inner peripheral surface portion 39 on the first inner peripheral surface portion 37 side, extends from the third edge 43 to the opening edge 35 side of the insertion hole 34. It is formed integrally with the inner peripheral surface of the insertion hole 34 so that the inner diameter is smaller than that of the peripheral surface portion 38 . That is, the third edge 43 is an end portion of the second inner peripheral surface portion 39 having a cylindrical inner surface shape on the first inner peripheral surface portion 37 side, and the inner peripheral edge has a diameter when viewed from the opening edge 35 side of the insertion hole 34 . An annular edge portion is formed by forming an edge shape on the inner side of the direction. 5 and 6, a third edge 43, which is an edge of the second inner peripheral surface portion 39 on the side of the first inner peripheral surface portion 37 and constitutes an edge portion, It is formed to have a circular shape with a smaller diameter than the shape of the second edge 42, which is the edge on the third edge 43 side. In other words, the shape of the second edge 42, which is the edge of the first inner peripheral surface portion 37 on the side of the third edge 43, is circular with a diameter larger than that of the third edge 43 that constitutes the edge portion. is formed in

As shown in FIGS. 6 and 7, the stepped inner peripheral surface portion 40 is formed inside the small-diameter cylindrical portion 32 of the pot body 30, and is the fourth edge that borders the second inner peripheral surface portion 39 in the axial direction. A step portion 45 is provided at the position of 44 . A disk-shaped ring member 47 having a through hole 46 in the center is fitted to the stepped inner peripheral surface portion 40 so as to engage with the stepped portion 45 . The ring member 47 is formed with pin holes 48 along the radial direction at a plurality of locations on its outer peripheral surface. On the other hand, in the small-diameter cylindrical portion 32 of the pot body 30, when the ring member 47 is fitted to the stepped inner peripheral surface portion 40, the portion facing the pin holes 48 of the ring member 47 in the radial direction has a A pin hole 49 is formed along it.

The ring member 47 is formed by inserting a pin (not shown) into the pin hole 48 through the pin hole 49 while the pin hole 48 is aligned with the pin hole 49 of the small-diameter cylindrical portion 32 . It is attached to the face portion 40 . As shown in FIGS. 6 and 7, the ring member 47 has a pin-like member at one point on the inner surface of the insertion hole 34 that faces toward the second inner peripheral surface portion 39 when the ring member 47 is fitted to the stepped inner peripheral surface portion 40 . is provided so as to extend along the axial direction.

Next, the operation of this embodiment will be described.
As shown in FIG. 8, in the case of the holding pot 11 of the comparative example in which the shape of the inner peripheral surface of the insertion hole 34 is different from the shape of the inner peripheral surface of the insertion hole 34 in the above-described embodiment, the tool holder, which is the member to be held, 20 may not be easily stabilized. That is, the insertion hole 34 of the holding pot 11 of the comparative example does not have the tapered inner peripheral surface portion 38, and the first inner peripheral surface portion 37 and the second inner peripheral surface portion 39 are bounded by the second edge 42 in the axial direction. It is formed so as to be continuous as The second inner peripheral surface portion 39 of the insertion hole 34 in the holding pot 11 of this comparative example has the same cross-sectional shape as the second edge 42 bordering the first inner peripheral surface portion 37 over the entire axial direction. It is formed to have a cylindrical inner surface shape, which is a circular shape.

Therefore, in the holding pot 11 of the comparative example, when the insertion portion 23 of the tool holder 20 is inserted into the insertion hole 34 as shown in FIG. It is supported at a fulcrum 51 at a position corresponding to the substantially triangular opening edge 35 . However, since the inner diameter of the second inner peripheral surface portion 39 located on the innermost side of the insertion hole 34 is larger than the circumscribed circle of the tip end portion of the insertion portion 23, the tip end portion of the insertion portion 23 is contact from the outside in the radial direction. Therefore, when a moment acts on the insertion portion 23 in a direction intersecting with the central axis A of the insertion hole 34, the attitude of the tool holder 20 may tilt.

On the other hand, as shown in FIG. 9, in the holding pot 11 of the present embodiment, when the insertion portion 23 of the tool holder 20 is inserted into the insertion hole 34, it first contacts the opening edge 35 of the insertion hole 34. The proximal end of the insertion portion 23 is supported by the positional fulcrum 51 . A third end edge 43 forming an annular edge portion on the inner depth side of the insertion hole 34 points at three points from the outside in the radial direction with respect to the distal end side portion of the so-called polygon tapered insertion portion 23 . Contact. That is, in the tool holder 20, the tip side portion of the insertion portion 23 is supported by the three fulcrums 52 in the circumferential direction of the third edge 43 shown in FIG. Therefore, in the tool holder 20, the insertion portion 23 is axially supported at two positions, the proximal end portion and the distal end portion, and a moment acts in a direction intersecting the central axis A of the insertion hole 34. It is also suppressed that the posture is tilted.

In addition, since the tool holder 20 is fitted to the opening edge 35 of the insertion hole 34 having the substantially triangular cross-sectional shape, the base end of the insertion portion 23 of the tool holder 20 having a substantially triangular shape is fitted to the opening edge 35 of the insertion hole 34 . is suppressed from being rotated in the rotational direction centered on . Moreover, the third end edge 43, which is an annular edge portion that contacts the distal end portion of the insertion portion 23 from the radially outer side on the inner depth side of the insertion hole 34, is the outer surface of the distal end portion of the insertion portion 23. Point contact is made at three points instead of surface contact. Therefore, in addition to the case where the insertion portion 23 has a truncated triangular pyramid shape as in the present embodiment, it is possible to correspond to a plurality of types of tool holders 20 having various so-called polygon tapered shapes such as a truncated quadrangular pyramid shape. be. Further, when the insertion portion 23 of the tool holder 20 is inserted into the insertion hole 34 , the tool holder 20 is guided by the tapered inner peripheral surface portion 38 to the third end edge 43 which is an annular edge portion at the inner depth of the insertion hole 34 . be.

Next, the effects of this embodiment will be described.
(1) Even if the shape of the insertion portion 23 of the tool holder 20 is a so-called polygonal tapered shape in which the cross-sectional shape gradually decreases from the base end side to the tip end side and the cross-sectional shape is a polygonal shape, the tool holder 20 can be stably supported by suppressing the inclination and rotation of the posture.

(2) For example, there is no need to attach a separate annular member having an annular edge portion formed in advance on the inner peripheral edge thereof to the inner peripheral surface of the insertion hole 34 on the inner depth side by bonding or the like. Therefore, the stable holding of the tool holder 20 can be easily realized without increasing the number of members and the manufacturing process of the holding pot 11 .

(3) A first inner peripheral surface portion 37 and a second inner peripheral surface portion 39 are formed on the inner peripheral surface of the insertion hole 34 so that the second inner peripheral surface portion 39 is located on the inner and inner side of the insertion hole 34 . Thus, an annular edge portion capable of supporting the so-called polygon tapered insertion portion 23 of the tool holder 20 can be easily formed.

(4) When the inserting portion 23 of the tool holder 20 is inserted into the inserting hole 34, the distal end portion of the inserting portion 23 is moved inside the inserting hole 34 by the guide function of the tapered inner peripheral surface 38 along the annular edge portion. It can be smoothly guided to a certain third edge 43 .

It should be noted that the above-described embodiment may be modified as in modification examples shown below. Moreover, the configuration included in the embodiment and the configuration included in the modified example below may be arbitrarily combined, and the configurations included in the modified example below may be arbitrarily combined.

- The holding pot 11 may be used to hold the tool holder 20 in a machine tool such as a machining center in addition to being supported by the carrier chain 12 .
- The member to be held which is removably held in the holding pot 11 may be a workpiece other than the tool holder 20, for example, which is cut.

The cross-sectional shape of the insertion portion 23, which has a so-called polygonal tapered shape, may be a polygonal shape such as a substantially quadrangular shape or a substantially hexagonal shape other than the substantially triangular shape.
The insertion hole 34 replaces the tapered inner peripheral surface portion 38 with a first inner peripheral surface portion 37 and a second inner peripheral surface portion having a cylindrical inner surface shape having the same circular cross-sectional shape as the second edge 42 . It may be provided between the peripheral surface portion 39 and the peripheral surface portion 39 . In this case, a stepped portion is formed at the position of the third edge 43 which is the boundary between the intermediate inner peripheral surface portion and the second inner peripheral surface portion 39, and the edge portion of the stepped portion forms an annular edge portion. is configured.

The first inner peripheral surface portion 37 and the second inner peripheral surface portion 39 of the insertion hole 34 may be continuous without providing the tapered inner peripheral surface portion 38 . In this case, a stepped portion is formed at the position of the edge that serves as a boundary between the first inner peripheral surface portion 37 and the second inner peripheral surface portion 39, and the edge portion of the stepped portion forms an annular edge portion. Configured.

The insertion hole 34 does not have the tapered inner peripheral surface 38 and the second inner peripheral surface 39, and has a cylindrical inner peripheral surface having the same circular cross-sectional shape as the second edge 42. It may be provided between the peripheral surface portion 37 and the stepped inner peripheral surface portion 40 . In this case, an annular edge portion is formed by edge-shaped corners of the stepped portion formed at the boundary between the intermediate inner peripheral surface portion and the stepped inner peripheral surface portion 40 .

・In addition to integrally forming an edge portion on the inner peripheral surface of the insertion hole 34 at the inner depth of the insertion hole 34, a separate tubular member having an annular edge portion formed on the inner peripheral surface in advance is attached to the insertion hole 34. You may make it attach to the inner peripheral surface part of the inner depths by adhesion|attachment.

REFERENCE SIGNS LIST 11: Holding pot 20: Tool holder that is an example of a member to be held 23: Insertion portion 34: Insertion hole 35: Opening edge 36: Polygonal inner peripheral surface portion 37: First inner peripheral surface portion 38: Taper inner peripheral surface portion 39: Third 2 inner peripheral surface portion 41 first edge 42 second edge 43 third edge constituting edge portion C circumscribed circle

Claims (4)

A holding pot that has an insertion hole along one direction and holds the member to be held by inserting an insertion portion of the member to be held into the insertion hole,
the insertion portion of the held member has a polygonal cross-sectional shape that gradually decreases in cross-sectional shape from the base end side to the distal end side;
The shape of the opening edge of the insertion hole on the side into which the insertion portion is inserted and withdrawn in the axial direction of the insertion hole matches the cross-sectional shape of the base end portion of the insertion portion of the held member. An inner peripheral surface on the inner depth side is provided with an annular edge portion whose inner peripheral edge shape matches the shape of the circumscribed circle of the distal end portion of the insertion portion of the held member. pot. The annular edge portion is integrally formed at one point on the inner depth side of the inner peripheral surface of the insertion hole so that the inner diameter is smaller than the point extending from the one point to the opening edge side of the insertion hole. 2. The holding pot of claim 1, wherein the holding pot is . a first inner peripheral surface portion of the insertion hole located closer to the opening edge than the edge portion in the axial direction, and having a circular end edge on the edge portion side having a larger diameter than the edge portion; and the shape of the edge on the side of the first inner peripheral surface is located on the inner depth side of the insertion hole relative to the first inner peripheral surface and the shape of the edge on the side of the edge portion in the first inner peripheral surface is smaller than the shape of the edge on the side of the edge portion a second inner peripheral surface portion having a small diameter and a circular shape, and the edge portion is formed by an edge-shaped edge of the second inner peripheral surface portion on the side of the first inner peripheral surface portion. 3. Holding pot according to claim 1 or claim 2. The first inner peripheral surface portion and the second inner peripheral surface portion are formed by a tapered inner peripheral surface portion having a truncated cone inner surface shape in which the inner diameter gradually decreases from the first inner peripheral surface side toward the second inner peripheral surface side. 4. The holding pot of claim 3, wherein the holding pot is connected.

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