Chuck claw, chuck, and lid member

Abstract

To provide a chuck claw capable of reducing a burden of a worker by removing work of cutting oil or the like, and capable of preventing falling-off of a cover member from a counterbore hole.SOLUTION: The second jaw 5 includes a chuck-claw-body side 5a, a second counterbore-hole side 5a provided on the chuck-claw-body side 5c, a second screw part 10 provided on the second counterbore-hole side 5c, a lid member 6 that closes the second counterbore-hole side 5c, and a first screw part 9 provided on the lid member 6. The first screw part 9 is engaged with the second screw part 10 so as to prevent the lid member 6 from falling off from the 5c of the second counterbore.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a chuck jaw, a chuck, and a lid member. [Background technology]

[0002] Chucks for gripping workpieces are used in the field of industrial machinery, etc. For example, the chuck disclosed in Patent Document 1 includes chuck jaws and bolt insertion holes formed in the chuck jaws. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6345375 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when cutting a workpiece, for example, cutting oil and chips can get into the bolt insertion hole (counterbore hole) in the chuck jaws. The cutting oil and other materials that have gotten into the counterbore hole must be removed, which creates a problem of burden on the worker.

[0005] To address this issue, it is conceivable to cover the countersunk hole with a cover member to prevent cutting oil and the like from entering the countersunk hole. However, for example, when the chuck jaws grip the workpiece sideways or when the chuck jaws rotate during cutting, there is a risk that the cover member may fall off the countersunk hole.

[0006] The present invention has been made in consideration of the above points, and its object is to provide a chuck jaw, a chuck, and a lid member that can reduce the burden on the worker caused by the work of removing cutting oil, etc., and can prevent the lid member from falling off from the countersunk hole. [Means for solving the problem]

[0007] In order to achieve the above object, the present invention provides a chuck jaw comprising a chuck jaw body, a countersunk hole provided in the chuck jaw body, an engaged portion provided in the countersunk hole, a cover member that closes the countersunk hole, and an engaging portion provided on the cover member, wherein the engaging portion engages with the engaged portion so as to prevent the cover member from falling off the countersunk hole.

[0008] According to the present invention configured as described above, the cover member blocks the countersunk hole, thereby preventing cutting oil and the like from entering the countersunk hole. This reduces the burden on the worker involved in removing cutting oil and the like. Furthermore, the engaging portion engages with the engaged portion to prevent the cover member from falling out of the countersunk hole. This prevents the cover member from falling out of the countersunk hole, for example, when the chuck jaws grip a workpiece sideways or when the chuck jaws rotate during cutting.

[0009] In the present invention, preferably, the engaging portion is a first screw portion, and the engaged portion is a second screw portion that can be screwed into the first screw portion.

[0010] According to the present invention configured in this manner, the first screw portion of the cover member and the second screw portion of the countersunk hole are screwed together, so that the cover member can be more reliably prevented from falling off from the countersunk hole.

[0011] In the present invention, preferably, the cover member includes a base portion located within the countersunk hole and provided with the engagement portion, and a roof portion located outside the chuck jaw body, and the roof surface of the roof portion includes an inclined surface portion.

[0012] According to the present invention configured as described above, for example, in the case of a vertical lathe in which the chuck jaws grip a workpiece vertically, cutting oil and the like slide down the inclined surface of the roof portion. This makes it difficult for cutting oil and the like to remain on the roof surface of the roof portion. Therefore, the burden on the worker in removing cutting oil and the like can be further reduced.

[0013] In the present invention, preferably, a side surface of the roof portion is provided with a tool engagement portion that can be engaged with a tool for attaching and detaching the lid member.

[0014] According to the present invention configured as described above, for example, in the case of a vertical lathe or the like in which the chuck jaws grip a workpiece vertically, the tool engagement portion is provided on the side surface of the roof portion, so cutting oil and the like are less likely to get into the tool engagement portion than when the tool engagement portion is provided on the roof surface of the roof portion, thereby further reducing the burden on the worker in removing cutting oil and the like.

[0015] In the present invention, preferably, the inclined surface portion includes a first inclined surface portion and a second inclined surface portion, and has a flat surface portion between the first inclined surface portion and the second inclined surface portion, and the tool engagement portion is provided on a side surface portion corresponding to the flat surface portion.

[0016] According to the present invention configured as described above, the tool engagement portion is provided on the side surface portion of the cover member corresponding to the flat surface portion which is thicker than the side surface portions corresponding to the first inclined surface portion and the second inclined surface portion, thereby preventing a decrease in the strength of the cover member due to the tool engagement portion.

[0017] In the present invention, the chuck jaw body is preferably a soft jaw.

[0018] According to the present invention configured as described above, for example, when replacing the chuck jaw body of a soft jaw, which is a consumable item, the cover member engaged with the chuck jaw body before replacement can be removed and the cover member can be attached to the chuck jaw body after replacement. This allows the cover member to be used repeatedly even when the chuck jaw body is replaced.

[0019] In the present invention, preferably, a chuck having chuck jaws comprises a chuck body, another countersunk hole provided in the chuck body, another engaged portion provided in the other countersunk hole, another cover member that closes the other countersunk hole, and another engaging portion provided on the other cover member, and the other engaging portion engages with the other engaged portion so as to prevent the other cover member from falling off the other countersunk hole.

[0020] According to the present invention configured in this manner, the other cover member blocks the other counterbore hole, thereby preventing cutting oil and the like from entering the other counterbore hole. This reduces the burden on the worker involved in removing cutting oil and the like. Furthermore, the other engaging portion engages with the other engaged portion to prevent the other cover member from falling off the other counterbore hole. This prevents the other cover member from falling off the other counterbore hole, for example, when the chuck body is configured so that the chuck jaws grip the workpiece sideways or when the chuck body rotates during cutting.

[0021] In order to achieve the above object, the present invention provides a cover member that can be used for a chuck jaw, which can block a countersunk hole provided in a chuck jaw body, and has an engaging portion that can engage with an engaged portion provided in the countersunk hole, and the engaging portion can engage with the engaged portion so as to prevent the cover member from falling off the countersunk hole.

[0022] According to the present invention configured as described above, when the cover member engages with the counterbore hole, the counterbore hole is blocked by the cover member, thereby preventing cutting oil and the like from entering the counterbore hole. This reduces the burden on the worker involved in removing cutting oil and the like. Furthermore, the engaging portion can engage with the engaged portion to prevent the cover member from falling out of the counterbore hole. This prevents the cover member from falling out of the counterbore hole, for example, when the chuck jaws grip a workpiece sideways or when the chuck jaws rotate during cutting. [Effects of the Invention]

[0023] It is possible to provide a chuck jaw, a chuck, and a lid member that can reduce the burden on the worker caused by the work of removing cutting oil, etc., and prevent the lid member from falling off the countersunk hole. [Brief explanation of the drawings]

[0024] [Figure 1] FIG. 1 is a perspective view showing a chuck according to an embodiment of the present invention. [Figure 2] FIG. 2 is a schematic cross-sectional view taken along line II-II in FIG. [Figure 3] 1A is a view of the cover member as seen from its side, and FIG. 1B is a view of the cover member as seen from its roof surface side. [Figure 4] FIG. 10 is a perspective view showing a state in which the first tool is being used. [Figure 5] FIG. [Figure 6] FIG. [Figure 7] (a) to (d) are diagrams showing modified examples, where (a) is a side view including a partial cross section showing the nut member, (b) is a view taken along arrow A in (a), (c) is a side view showing the screw member, and (d) is a view taken along arrow B in (c). [Figure 8] FIG. DETAILED DESCRIPTION OF THE INVENTION

[0025] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the following description of the preferred embodiments is merely exemplary in nature.

[0026] Fig. 1 shows a chuck 1 according to an embodiment of the present invention. As shown in Fig. 1 and Fig. 2, the chuck 1 has a chuck body 2 that is disk-shaped and has a thickness, and is made of metal.

[0027] The front surface 2a of the chuck body 2 is a flat surface. In addition, a through-hole 2b is provided in the center of the chuck body 2, penetrating the chuck body 2 in the thickness direction.

[0028] A plurality of slide grooves 2c extending in the radial direction are provided at equal intervals around the through hole 2b. In this embodiment, the chuck body 2 has three slide grooves 2c.

[0029] A first countersunk hole 2d (for example, a deep countersunk hole) into which the first bolt B1 can be inserted is provided at a position between two circumferentially adjacent slide grooves 2c in the chuck body 2. In this embodiment, the two first countersunk holes 2d are arranged side by side in the circumferential direction.

[0030] In this embodiment, the back side of the chuck body 2 is detachably attached to a machine tool M (for example, a horizontal lathe) using a first bolt B1 (see FIG. 2). For convenience, the machine tool M is omitted from FIGS. 1 and 3.

[0031] 2, when the chuck body 2 is attached to the machine tool M, the first bolt B1 is inserted into the first countersunk hole 2d. In other words, the first countersunk hole 2d is a bolt insertion hole.

[0032] Here, the head of the first bolt B1 is located within the first countersunk hole 2d. In other words, the front end of the head of the first bolt B1 is located closer to the rear side than the front opening of the first countersunk hole 2d. As a result, a first space S1 is formed between the front opening of the first countersunk hole 2d and the head of the first bolt B1.

[0033] 1, a plurality of jaws 3 for gripping, for example, a cylindrical workpiece W (see FIG. 2) are radially arranged at equal intervals on the front side of the chuck body 2. In this embodiment, three metal jaws 3 are provided.

[0034] The jaw 3 includes a first jaw 4 assembled in the slide groove 2c so as to be slidable in the radial direction, and a second jaw 5 assembled to the front side of the first jaw 4. The first jaw 4 also includes an inverted T-shaped groove 4a that opens to the front side, and a T-nut 4b is inserted into the groove 4a.

[0035] The second jaw 5 has a chuck jaw body 5a that is substantially rectangular parallelepiped. A workpiece gripping portion 5b is provided at one longitudinal end (central end) of the chuck jaw body 5a. In this embodiment, the second jaw 5 is a soft jaw that has not been subjected to hardening treatment such as quenching.

[0036] The chuck jaw body 5a also has a plurality of second countersunk holes 5c (for example, deep countersunk holes) formed therethrough. In this embodiment, the chuck jaw body 5a has two second countersunk holes 5c.

[0037] In this embodiment, the second jaw 5 is detachably attached to the first jaw 4 using a second bolt B2. More specifically, the second bolt B2 inserted into the second countersunk hole 5c of the chuck jaw body 5a (second jaw 5) is fastened to a T-nut 4b inserted into the groove 4a of the first jaw 4. Here, since the T-nut 4b is inserted into the groove 4a of the first jaw 4, the second jaw 5 is detachably attached to the first jaw 4 by connecting the T-nut 4b and the second bolt B2.

[0038] 2, in a state in which the second jaw 5 is attached to the first jaw 4, the second bolt B2 is inserted through the second countersunk hole 5c. In other words, the second countersunk hole 5c is a bolt insertion hole.

[0039] Here, the head of the second bolt B2 is located within the second countersunk hole 5c. In other words, the front end of the head of the second bolt B2 is located closer to the rear side than the front opening of the second countersunk hole 5c. As a result, a second space S2 is formed between the front opening of the second countersunk hole 5c and the head of the second bolt B2.

[0040] As shown in FIGS. 1 and 2, the chuck 1 is provided with a cover member 6 (made of, for example, metal) that closes each of the plurality of first countersunk holes 2d and the plurality of second countersunk holes 5c.

[0041] The lid member 6 is engaged with the countersunk holes 15 so as to prevent the lid member 6 from falling off from the countersunk holes 15 (the first countersunk hole 2d and the second countersunk hole 5c).

[0042] As shown in FIG. 3(a), the cover member 6 includes a roof portion 7 and a base portion 8 that is integral with the roof portion 7. The roof portion 7 has a larger diameter than the countersunk hole 15. The base portion 8 has a smaller diameter than the countersunk hole 15. In other words, the roof portion 7 has a larger diameter than the base portion 8.

[0043] Furthermore, when the cover member 6 is engaged with the countersunk hole 15, the roof portion 7 is located outside the countersunk hole 15 (see FIGS. 1 and 2). In other words, the roof portion 7 is exposed to the outside of the chuck jaw body 5a, that is, it is located outside the chuck jaw body 5a.

[0044] On the other hand, when the cover member 6 is engaged with the countersunk hole 15, the base portion 8 is located inside the countersunk hole 15 (see FIG. 2). In other words, the base portion 8 is not exposed to the outside of the chuck jaw main body 5a, but is located inside the chuck jaw main body 5a.

[0045] As shown in Figures 3(a) and 3(b), the roof portion 7 is located on the opposite side to the base portion 8, in other words, it has a roof surface 7a that is located on the front side when the cover member 6 is engaged with the countersunk hole 15 (see Figure 1).

[0046] The roof surface 7a is provided with a first inclined surface portion 7b having an inclined surface and a second inclined surface portion 7c having an inclined surface. As shown in Fig. 3(a), the first inclined surface portion 7b and the second inclined surface portion 7c are substantially semicircular when viewed from the front side.

[0047] The roof surface 7a is provided with a flat surface portion 7d between the first inclined surface portion 7b and the second inclined surface portion 7c. The flat surface portion 7d has a substantially rectangular shape when viewed from the front side.

[0048] 3(a), the first inclined surface portion 7b and the second inclined surface portion 7c are inclined so that the further they are from the flat surface portion 7d, the closer they are to the base portion 8. As a result, the thickness of the portion of the roof portion 7 corresponding to the flat surface portion 7d (the dimension in the juxtaposition direction of the roof portion 7 and the base portion 8) is greater than the thickness of the portions of the roof portion 7 corresponding to the first inclined surface portion 7b and the second inclined surface portion 7c.

[0049] A circular engagement hole 7f is provided in a side surface portion 7e of the roof portion 7 that corresponds to the flat surface portion 7d. The engagement hole 7f extends linearly along the flat surface portion 7d, with one end opening provided in one side surface portion 7e and the other end opening provided in the other side surface portion 7e. This allows the engagement hole 7f to engage with a rod-shaped first tool K1 for attaching and detaching the cover member 6 (see FIG. 4).

[0050] The base portion 8 is cylindrical, and has a first screw portion 9 on its outer surface. A second screw portion 10 that can be threadedly engaged with the first screw portion 9 is provided in the countersunk hole 15 (see FIG. 2). In this embodiment, the first screw portion 9 has a screw thread, and the second screw portion 10 has a screw hole. The screw thread of the first screw portion 9 and the screw hole of the second screw portion 10 are configured to be threadably engaged with each other.

[0051] When the first tool K1 is inserted (engaged) into the engagement hole portion 7f, for example, if an operator uses the first tool K1 to rotate the cover member 6 having the first screw portion 9 engaged with the second screw portion 10 of the countersunk hole 15 to one side, the cover member 6 will screw back, disengaging the cover member 6 from the countersunk hole 15, i.e., the cover member 6 can be removed from the countersunk hole 15.

[0052] On the other hand, in a state where the lid member 6 is set in the countersunk hole 15 and the first tool K1 is inserted into the engagement hole portion 7f (a state where the first tool K1 is engaged with the engagement hole portion 7f), for example, when an operator rotates the lid member 6 to the other side using the first tool K1, the lid member 6 screws forward and the first screw portion 9 of the lid member 6 screws (engages) with the second screw portion 10 of the countersunk hole 15, that is, the lid member 6 can be attached to the countersunk hole 15. In this embodiment, the first screw portion 9 engages with the second screw portion 10 so as to prevent the lid member 6 from falling off from the countersunk hole 15. This prevents the lid member 6 from falling off from the countersunk hole 15, for example, even when the chuck 1 grips the workpiece W sideways or when the chuck 1 rotates when cutting the workpiece W.

[0053] As described above, according to this embodiment, the cover member 6 blocks the second countersunk hole 5c, thereby preventing cutting oil and the like from entering the second countersunk hole 5c. This reduces the burden on the worker involved in removing cutting oil and the like. Furthermore, the first screw portion 9 engages with the second screw portion 10 to prevent the cover member 6 from falling off the second countersunk hole 5c. This prevents the cover member 6 from falling off the second countersunk hole 5c, for example, when the second jaw 5 grips the workpiece W sideways or when the second jaw 5 rotates during cutting.

[0054] Furthermore, since the first screw portion of the cover member 6 and the second screw portion of the countersunk hole 15 are screwed together, the cover member 6 can be more reliably prevented from falling off from the second countersunk hole 5c.

[0055] Furthermore, for example, in the case of a vertical lathe or the like in which the second jaw 5 grips the workpiece W vertically, cutting oil and the like slides down the first inclined surface portion 7b and the second inclined surface portion 7c of the roof portion 7. This makes it difficult for cutting oil and the like to remain on the roof surface 7a of the roof portion 7. Therefore, the burden on the worker due to the work of removing cutting oil and the like can be further reduced.

[0056] Furthermore, by providing the roof portion 7 with the first inclined surface portion 7b and the second inclined surface portion 7c, the weight of the roof portion 7 can be reduced compared to a case where the roof portion 7 does not have the first inclined surface portion 7b and the second inclined surface portion 7c. This allows for a reduction in the power consumption of the machine tool M, for example, when the machine tool M is a lathe.

[0057] Furthermore, since the base portion 8 is cylindrical, the weight of the base portion 8 can be reduced compared to when the base portion 8 is columnar. This allows for a reduction in the power consumption of the machine tool M, for example, when the machine tool M is a lathe.

[0058] Furthermore, for example, in the case of a vertical lathe or the like in which the second jaw 5 grips a workpiece vertically, the engagement hole 7f is provided in the side surface portion 7e of the roof portion 7, so cutting oil and the like are less likely to get into the engagement hole compared to when the engagement hole 7f is provided in the roof surface 7a of the roof portion 7. This further reduces the burden on the worker caused by the work of removing cutting oil and the like.

[0059] Furthermore, the engagement hole 7f is provided in the side surface portion corresponding to the flat surface portion 7d, which is thicker than the side surface portion 7e corresponding to the first inclined surface portion 7b and the second inclined surface portion 7c in the cover member 6. This makes it possible to prevent a decrease in the strength of the cover member 6 due to the engagement hole 7f.

[0060] Furthermore, for example, when replacing the chuck jaw body 5a of the soft jaws, which are consumables, the lid member 6 engaged with the chuck jaw body 5a before replacement can be removed and the lid member 6 can be attached to the replaced chuck jaw body 5a. This allows the lid member 6 to be used repeatedly even when the chuck jaw body 5a is replaced.

[0061] Furthermore, because the cover member 6 blocks the first countersunk hole 2d, it is possible to prevent cutting oil and the like from entering the first countersunk hole 2d. This reduces the burden on the worker involved in removing cutting oil and the like. Furthermore, the first screw portion 9 engages with the second screw portion 10 to prevent the cover member 6 from falling off the first countersunk hole 2d. This prevents the cover member 6 from falling off the first countersunk hole 2d, for example, when the chuck body 2 is configured so that the second jaw 5 grips the workpiece W sideways or when the chuck body 2 rotates during cutting.

[0062] Furthermore, when the cover member 6 engages with the second countersunk hole 5c, the second countersunk hole 5c is blocked by the cover member 6, making it possible to prevent cutting oil and the like from entering the second countersunk hole 5c. This reduces the burden on the worker involved in removing cutting oil and the like. Furthermore, the first screw portion 9 can engage with the second screw portion 10 to prevent the cover member 6 from falling off the second countersunk hole 5c. This makes it possible to prevent the cover member 6 from falling off the second countersunk hole 5c, for example, when the second jaw 5 grips the workpiece W sideways or when the second jaw 5 rotates during cutting.

[0063] In this embodiment, an example in which the chuck 1 has three jaws 3 has been described, but the chuck 1 may have two jaws 3, or four or more jaws 3.

[0064] In addition, in this embodiment, an example has been described in which the chuck 1 is attached to a horizontal lathe, but the chuck 1 may be attached to a machine tool other than a horizontal lathe (for example, a vertical lathe, a drill press, etc.) as long as it is capable of being attached to the machine tool.

[0065] Furthermore, in this embodiment, the chuck 1 has been described using an example in which it grips the workpiece W, but it may also be used for gripping an object other than the workpiece W (for example, for fixing a cutting tool or the like).

[0066] Furthermore, in this embodiment, an example has been described in which the second jaw 5 is a soft jaw, but the second jaw 5 may be a hard jaw that has been subjected to hardening treatment such as quenching.

[0067] Furthermore, in this embodiment, an example has been described in which the cover member 6 is made of metal, but it may be made of a material other than metal (for example, resin).

[0068] Furthermore, in this embodiment, an example has been described in which the lid member 6 includes the roof portion 7, but the lid member 6 does not necessarily have to include the roof portion 7.

[0069] Furthermore, in this embodiment, an example has been described in which the roof surface 7a of the cover member 6 is provided with the first inclined surface portion 7b, the second inclined surface portion 7c, and the flat surface portion 7d, but the roof surface 7a may be provided with only the first inclined surface portion 7b, or the roof surface 7a may be provided with only the first inclined surface portion 7b and the second inclined surface portion 7c, or the roof surface 7a may be provided with only the first inclined surface portion 7b and the flat surface portion 7d, or the roof surface 7a may be provided with only the flat surface portion 7d.

[0070] Furthermore, in the present embodiment, an example has been described in which the side surface portion 7e of the roof portion 7 is provided with an engagement hole 7f that can engage with the tool K for the lid member. However, instead of the engagement hole 7f, a first engagement recess (not shown) that can engage with the tool K for the lid member may be provided in the side surface portion 7e of the roof portion 7, or as shown in FIG. 5, a second engagement recess 7g may be provided in the roof surface 7a of the roof portion 7, or as shown in FIG. 6, a third engagement recess 8a may be provided in the base portion 8 of the lid member 6 that does not have a roof portion 7. In the example shown in FIG. 5, the lid member 6 may be attached or detached using a second tool K2 that can engage with the second engagement recess 7g. Furthermore, in the example shown in FIG. 6, the lid member 6 may be attached or detached using a third tool K3 that can engage with the third engagement recess 8a.

[0071] In addition, in this embodiment, an example has been described in which the cover member 6 is engaged with both the first countersunk hole 2d and the second countersunk hole 5c, but the cover member 6 may be engaged with only one of the first countersunk hole 2d and the second countersunk hole 5c.

[0072] Furthermore, in this embodiment, an example in which two countersunk holes 15 (first countersunk hole 2d and second countersunk hole 5c) are provided has been described, but one or three or more may be provided.

[0073] Furthermore, in this embodiment, an example has been described in which the countersunk holes 15 (first countersunk hole 2d and second countersunk hole 5c) are deep countersunk holes, but they may be holes other than deep countersunk holes (for example, countersunk holes).

[0074] In addition, in this embodiment, an example has been described in which the front end portions of the heads of the first bolt B1 and the second bolt B2 are located on the back side of the front opening of the countersunk hole 15, but as long as the cover member 6 can engage with the countersunk hole 15, the front end portions of the heads of the first bolt B1 and the second bolt B2 may be made to coincide with the front opening of the countersunk hole 15, or the front end portions of the heads of the first bolt B1 and the second bolt B2 may be made to be located on the front side of the front opening of the countersunk hole 15.

[0075] Furthermore, in the present embodiment, the first screw portion 9 is used as the engaging portion of the lid member 6, and the second screw portion 10 is used as the engaged portion of the countersunk hole 15. However, as long as it is possible to prevent the lid member 6 from falling off from the countersunk hole 15, the present invention is not limited to the first screw portion 9 and the second screw portion 10. For example, the lid member 6 may be configured to be hooked onto the countersunk hole 15 to prevent it from falling off, or the lid member 6 and the countersunk hole 15 may be fitted together (for example, by an interference fit or a shrink fit) to prevent it from falling off from the countersunk hole 15, or the lid member 6 and the countersunk hole 15 may be engaged together by the magnetic force of a magnet (not shown) to prevent it from falling off from the countersunk hole 15. When a magnet (not shown) is used, the magnet (not shown) may be provided in both the cover member 6 and the countersunk hole 15, or the magnet (not shown) may be provided in only one of the cover member 6 and the countersunk hole 15.

[0076] Furthermore, in this embodiment, the cover member 6 is configured as a single part, but as shown in the modified examples of Figures 7(a), 7(b), 7(c), 7(d), and 8, the cover member 6 may be configured from a nut member 21 and a screw member 22. In this modified example, the second screw portion 10 is not provided on the inner peripheral surface of the countersunk hole 15 (second countersunk hole 5c) of the second jaw 5.

[0077] The outer diameter of the nut member 21 shown in Figures 7(a) and 7(b) is set slightly smaller than the diameter of the countersunk hole 15 (second countersunk hole 5c). The nut member 21 also has another through hole 21a in its central portion. A third thread portion 21b is provided on the inner circumferential surface on one side of the other through hole 21a. Furthermore, the nut member 21 has a slot portion 21c on the other side. The slot portion 21c has a plurality of (e.g., eight) slot grooves 21d.

[0078] The screw member 22 shown in Figures 7(c) and 7(d) has a fourth screw portion 22a on one side that can be threaded (engaged) with the third screw portion 21b, and another head portion 22b on the other side. The other roof surface 22c of the other head portion 22b has a fourth engagement recess 22d that can engage with a fourth tool K4 (see Figure 8). In addition, a tapered portion 22e is provided on the side of the other head portion 22b, the diameter of which increases toward the other roof surface 22c (the side opposite to the fourth screw portion 22a). The tapered portion 22e has an outer diameter slightly larger than the hole diameter of the other through hole 21a.

[0079] 7 and 8, when the screw member 22 is screwed into the nut member 21 using the fourth tool K4 (when the third screw portion 21b and the fourth screw portion 22a are screwed together) with at least a portion of the slotted portion 21c of the nut member 21 positioned in the countersunk hole 15 (second countersunk hole 5c) of the second jaw 5, the tapered portion 22e, which has an outer diameter larger than the diameter of the other through hole 21a, widens the slotted portion 21c radially outward (see FIG. 8). As a result, the outer peripheral surface portion 21e of the slotted portion 21c is fixed (engaged) with the inner peripheral surface portion 25 of the countersunk hole 15 (second countersunk hole 5c) of the second jaw 5. Therefore, the cover member 6, which is composed of the nut member 21 and the screw member 22, can be engaged with the countersunk hole 15 (second countersunk hole 5c).

[0080] Furthermore, in this embodiment, an example has been described in which the first screw portion 9 of the cover member 6 is screwed (engaged) with the second screw portion 10 provided in the first countersunk hole 2d, but the cover member 6 composed of a nut member 21 and a screw member 22 shown in the modified example in Figures 7 and 8 may also be engaged with the first countersunk hole 2d in which the second screw portion 10 is not provided. [Industrial Applicability]

[0081] The present invention is suitable for a chuck jaw, a chuck, and a lid member. [Explanation of symbols]

[0082] 1 chuck 2 chuck bodies 2d First counterbore hole (other counterbore holes) 5 Second jaw (chuck jaw) 5a chuck jaw body 5c Second counterbore hole (counterbore hole) 6 Lid member (other lid member) 7 Roof section 7a Roof surface 7b First slope part (slope part) 7c 2nd slope section (slope section) 7d Flat surface part 7e side part 7f Engagement hole (tool engagement part) 7g Second engagement recess (engagement portion for tool) 8 Base 8a Third engagement recess (engagement portion for tool) 9 First screw part (engagement part, other engagement part) 10 Second screw portion (engaged portion, other engaged portion) 21e Outer circumferential surface portion (engagement portion, other engagement portion) 22d Fourth engagement recess (engagement portion for tool) 25 Inner surface portion (engaged portion, other engaged portion) K1 First tool (tool for attaching and removing the cover) K2 Second tool (tool for attaching and removing the cover member) K3 Third tool (tool for attaching and removing the cover) K4 4th tool (tool for attaching and removing the cover)

Claims

1. A chuck jaw, A chuck jaw body, A counterbore hole provided in the chuck jaw body; an engaged portion provided in the countersunk hole; a cover member that closes the countersunk hole; an engaging portion provided on the lid member, The engaging portion engages with the engaged portion so as to prevent the lid member from falling out of the countersunk hole.

2. The chuck jaws according to claim 1, the engaging portion is a first screw portion, The engaged portion is a second screw portion that can be screwed onto the first screw portion.

3. The chuck jaws according to claim 1, The cover member includes a base portion located in the countersunk hole and provided with the engaging portion, and a roof portion located outside the chuck jaw body, The roof surface of the roof portion has an inclined surface portion.

4. The chuck jaws according to claim 3, A chuck jaw is provided on a side surface of the roof portion with a tool engagement portion that can be engaged with a tool for attaching and detaching the lid member.

5. The chuck jaws according to claim 4, the inclined surface portion includes a first inclined surface portion and a second inclined surface portion, a flat surface portion between the first inclined surface portion and the second inclined surface portion; The tool engagement portion is a chuck claw provided on a side surface portion corresponding to the flat surface portion.

6. The chuck jaws according to claim 1, The chuck jaw body is a soft jaw.

7. A chuck having the chuck jaws according to any one of claims 1 to 6, The chuck body and Another counterbore hole provided in the chuck body; Another engaged portion provided in the other countersunk hole; Another cover member that closes the other countersunk hole; another engaging portion provided on the other lid member, The other engaging portion engages with the other engaged portion so as to prevent the other lid member from falling off the other countersunk hole.

8. A cover member that can be used for a chuck jaw, It is possible to close the counterbore hole provided in the chuck jaw body, an engaging portion that can engage with an engaged portion provided in the countersunk hole; The engaging portion is engageable with the engaged portion so as to prevent the lid member from falling off the countersunk hole.

Images