JP2016124070A - Chuck device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chuck device extremely excellent in workability, capable of easily and securely clamping a tool or the like having a small diameter, with edges of claws.SOLUTION: The chuck device includes a main body 3 having multiple claws 2 at a tip, for clamping an object 1 to be clamped. At the main body, there is provided a claw advancing/retracting and expanding/contracting portion for advancing, retracting, expanding, and contracting the claws 2. Each claw 2 has a pair of inclined side surfaces 30, and a ridge line portion where the pair of inclined side surfaces 30 intersect with each other includes an edge portion 31 for clamping a peripheral surface of the object 1 to be clamped. The claw advancing/retracting and expanding/contracting portion includes: a conjunction body 5 that is locked to the claws 2; and an advancing/retracting mechanism for advancing and retracting the conjunction body 5. The chuck device further includes a claw expansion range restriction portion for restricting a retraction range of the claws 2, and limiting a maximum expansion range of the claws 2 to the range where the object 1 to be clamped does not enter a portion between the inclined side surfaces 30.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a chuck device.

  As disclosed in, for example, Patent Document 1, a conventional chuck device rotates a rotating cylinder provided in a main body, and rotates the rotating nut that rotates together with the rotating cylinder. The nail | claw which joined is expanded / retracted, and it is the structure which clamps or open | releases a tool with this nail | claw.

  By the way, in the conventional chuck device, as shown in FIG. 1, when the diameter of the tool 101 is small, if the enlargement amount of the claw 102 is excessive, the tool 101 is not between the edges 103 of the claw 102 but the side surface of the claw 102. The tool 101 is likely to be caught between the side surfaces 104 of the claws 102.

  In this case, the tool 101 is displaced from the center of rotation of the chuck, and tool runout occurs during machining. Therefore, it is necessary to check carefully whether or not the tool 101 is accurately held by the edge 103 of the claw 102.

  This problem becomes conspicuous when a small diameter tool having a diameter of 1 mm or less is used, resulting in a significant reduction in work efficiency.

Japanese Patent No. 3786726

  The present invention solves the above-mentioned problems, and by restricting the amount of nail expansion, it is possible to prevent the object to be clamped, such as a small-diameter tool, from being sandwiched between the side surfaces of the nail, and It is an object of the present invention to provide a chuck device with excellent workability capable of securely holding a small-diameter tool or the like between claw edges.

  The gist of the present invention will be described with reference to the accompanying drawings.

  A main body 3 having a plurality of claws 2 sandwiching the object to be clamped 1 is provided with a claw advance / retract portion for advancing / retracting the claw 2, and the claw 2 is provided with a pair of inclined side surfaces 30. It is a chuck device in which an edge portion 31 for sandwiching the peripheral surface of the object to be clamped 1 is provided at the intersecting ridge line portion of the inclined side surface 30, wherein the claw advance / retract portion is interlocked with the claw 2 5 and an advancing / retreating mechanism for moving the interlocking member 5 back and forth, restricting the retraction range of the claw 2, and the object 1 to be sandwiched between the inclined side surfaces 30 within the maximum expansion range of the claw 2. The present invention relates to a chuck device characterized in that a claw enlargement range restricting portion for restricting to a range that does not enter is provided.

  2. The chuck device according to claim 1, wherein the claw enlargement range restricting portion is configured such that the maximum enlargement range of the claw 2 is inserted between the edge portions 31. The chuck device is configured to be smaller than the diameter of the sandwiched article 1.

  The chuck device according to any one of claims 1 and 2, wherein the chuck device clamps the object to be clamped 1 having a diameter of 0.5 mm or less. Is.

  Further, in the chuck device according to any one of claims 1 to 3, a chamfered portion 33 for facilitating the insertion of the object to be clamped 1 is provided on the tip end side of the edge portion 31 of each claw 2. The present invention relates to a chuck device characterized by being formed respectively.

  The chuck device according to any one of claims 1 to 4, wherein the advance / retreat mechanism is a screw mechanism that moves the interlocking member 5 forward and backward by screwing. .

  The chuck device according to any one of claims 1 to 4, wherein the advance / retreat mechanism is a cam mechanism that moves the interlocking member 5 forward and backward by a cam.

  6. The chuck device according to claim 5, wherein the advancing / retreating mechanism rotates the rotating cylinder 4 provided in the main body 3 or rotates the interlocking body 5 exposed from the main body 3. The chuck device is characterized in that the body 5 is screwed.

  The chuck device according to any one of claims 5 and 6, wherein the interlocking member 5 is moved forward and backward by operating the screw mechanism or the cam mechanism provided inside the main body 3 by an operating tool. The present invention relates to a chuck device that is configured.

  The chuck device according to any one of claims 1 to 8, wherein the edge portion 31 is chamfered.

  The chuck device according to any one of claims 1 to 9, wherein the claw 2 is three claws arranged radially.

  Since the present invention is configured as described above, the chuck device is excellent in workability and can easily and surely hold a small-diameter tool or the like between the edges of the claw.

It is a general | schematic expansion explanatory top view of the front-end | tip part of the nail | claw of the conventional chuck | zipper apparatus. 1 is an exploded perspective view of Example 1. FIG. 1 is a longitudinal sectional view schematically illustrating Example 1. FIG. FIG. 5 is a schematic explanatory plan view of Example 1 corresponding to FIG. 3. 1 is a longitudinal sectional view schematically illustrating Example 1. FIG. FIG. 6 is a schematic explanatory plan view of Example 1 corresponding to FIG. 5. 1 is a longitudinal sectional view schematically illustrating Example 1. FIG. FIG. 8 is a schematic explanatory plan view of Example 1 corresponding to FIG. 7. 10 is a schematic plan view of another example 1. FIG. FIG. 3 is a schematic enlarged explanatory plan view of a tip portion of a nail according to Embodiment 1; It is a schematic explanatory perspective view of the nail | claw of Example 1. FIG. It is a schematic explanatory perspective view of a nail of another example 2. 10 is a schematic explanatory longitudinal sectional view of another example 3. FIG. 10 is a schematic explanatory longitudinal sectional view of another example 3. FIG. 10 is a schematic cross-sectional view of a main part of another example 3. FIG. It is a schematic explanatory longitudinal cross-sectional view of Example 2. FIG. It is a schematic explanatory longitudinal cross-sectional view of Example 2. FIG. 10 is a schematic explanatory longitudinal sectional view of another example 4. FIG. 10 is a schematic explanatory longitudinal sectional view of another example 5. FIG. It is a schematic explanatory longitudinal cross-sectional view of Example 3. FIG. FIG. 5 is a schematic cross-sectional view of a main part of Example 3. It is a schematic explanatory longitudinal cross-sectional view of Example 3. FIG. 6 is a schematic explanatory longitudinal sectional view of Example 4. FIG. It is a schematic explanatory longitudinal cross-sectional view of the principal part of Example 4. FIG. 6 is a schematic explanatory longitudinal sectional view of Example 4. FIG.

  An embodiment of the present invention which is considered to be suitable will be briefly described with reference to the drawings showing the operation of the present invention.

  After the nail 2 is moved backward and enlarged, the object to be clamped 1 such as a tool or a work is inserted between the edge portions 31 of the nail 2, and then the nail 2 is moved forward and down to clamp the object to be clamped 1 by the edge 31 of the nail 2 To do.

  At this time, the maximum expansion range of the nail 2 is limited by the expansion range limiting portion, and when the object 1 is inserted between the edge portions 31 of the nail 2, the object 1 enters between the inclined side surfaces 30 of the nail 2. Can be reliably prevented.

  Therefore, it is not necessary for the operator to carefully perform the nail enlargement operation so that the object to be sandwiched 1 does not enter between the inclined side surfaces 30 of the nail 2, and the object 1 is simply expanded by enlarging the nail 2 to the maximum enlargement range. It is only necessary to insert them between 31 and even the small-diameter tool 1 can be easily and reliably sandwiched between the edges of the claw 2.

  A specific embodiment 1 of the present invention will be described with reference to FIGS.

  In the first embodiment, a main body 3 having three claws 2 provided radially to clamp the tool 1 as the object to be clamped 1 is provided with a claw advance / retract expansion / contraction section that retracts, expands, advances, and reduces the claw 2. The claw 2 is provided with a pair of inclined side surfaces 30, and a chuck device in which an edge portion 31 for sandwiching the peripheral surface of the tool 1 is provided at a cross ridge line portion of the pair of inclined side surfaces 30, The advancing / retracting portion is composed of an interlocking body 5 that is engaged with the claw 2 and an advancing / retreating movement mechanism that moves the interlocking body 5 back and forth. When the tool 1 is inserted between the edge portions 31 of the claw 2, the retraction range of the claw 2 is limited, and the maximum expansion range of the claw 2 is limited to a range where the tool 1 does not enter between the inclined side surfaces 30. A nail enlargement range limiting portion is provided.

  In the first embodiment, the advancing / retreating movement mechanism is configured to move the interlocking body 5 and the claw 2 forward / backward in conjunction with the rotation of the rotating cylinder 4 fitted to the main body 3.

  Specifically, in Example 1, as a tool 1, an electrode for electric discharge machining having a diameter of 0.5 mm or less (specifically, a diameter of about 0.1 to 0.3 mm) is sandwiched as a tool 1 It is. In addition to the electrode for electric discharge machining, a tool 1 such as a small diameter drill or a small diameter work can be sandwiched.

  Each part will be specifically described. Each part is made of metal (made of stainless steel). The material is not limited to metal, and may be made of a material that does not generate rust, or may be subjected to surface treatment such as plating.

  As shown in FIGS. 2 and 3, the main body 3 includes a proximal end cylinder 15 and a distal end cover body 16.

  A proximal-side threaded portion 17 that is threadedly engaged with the inner circumferential threaded portion 18 of the rotating cylinder 4 is provided at the proximal-end-side outer peripheral portion of the proximal end cylindrical body 15. Further, on the outer peripheral portion on the distal end side of the proximal end cylindrical body 15, a distal end side screw that is threadedly engaged with the inner peripheral threaded portion 20 of the distal end cover body 16 formed with a guide taper surface on the inner surface for guiding the forward / backward expansion / contraction of the claw 2. A joint portion 19 is provided.

  The proximal end cylinder 15 is provided with a distal end side insertion portion 21 through which the interlocking body 5 is inserted and a proximal end insertion portion 22 communicating with the distal end side insertion portion 21.

  An insertion hole 23 having substantially the same diameter as the insertion rod 6 through which the insertion rod 6 is inserted is provided on the base end side of the interlocking body 5 that is inserted into the distal end side insertion portion 21 so as to be able to move forward and backward. 23 is configured such that both ends thereof communicate with (a part of) a circumferential surface opening 24 formed on the circumferential surface of the proximal end cylinder 15.

  Then, when the insertion rod 6 is inserted from the peripheral surface opening 24 on one side of the proximal end cylinder 15, it reaches the insertion hole 23 and the opposite peripheral surface opening 24, and both end portions thereof are open to the peripheral surface. The length and the like are set so as to slightly protrude from the portion 24.

  Further, a claw holding body for holding the claw 2 is provided at the distal end portion of the interlocking body 5 as the distal end side insertion portion 21 of the proximal end cylindrical body 15. That is, the interlocking body 5 is provided so that it can move forward and backward in the nail holder along the axial direction of the main body 3. The claw holder is composed of a cylindrical base 25 and a claw holder 27 provided on the distal end side of the base 25 and having a slit 26 in which the distal ends of the claws 2 are respectively disposed. In the first embodiment, three slit portions 26 are provided at intervals of 120 °. The slit portion 26 is a groove 77 having a T-shaped cross section, and is set in a shape that matches the claw 2.

  At the distal end of the interlocking body 5, a locking groove 36 in which a step portion 35 that locks with a locking portion 34 provided at the base end portion of the claw 2 is formed. Three locking grooves 36 are provided at intervals of 120 °. Therefore, the claw 2 whose base end portion is locked in the locking groove 36 (the step portion thereof) moves forward and backward together with the interlocking body 5.

  As shown in FIG. 11, an inclined surface 28 is provided on the outer peripheral side of the tip of the claw 2 and is set to a tapered surface that substantially matches the inclination angle and the degree of curvature of the guide tapered surface of the inner surface of the tip cover body 16. Yes. Further, a protruding portion 29 protruding left and right is formed on the outer peripheral side of the tip of the claw 2 so that the guide taper surface can be guided favorably, and the inclined surface 28 is made as wide as possible. Has been.

  A pair of inclined side surfaces 30 (flank surfaces) that escape at a predetermined angle are provided on the side of the opposing portion that opposes the other claws 2 of the claw 2, and the intersecting ridge line portion between the inclined side surfaces 30 becomes an edge portion 31. In the first embodiment, the edge portion 31 is an intersecting ridge line between the inclined side surfaces 30 and is linear.

  Further, a chamfered portion 33 that is inclined inward and guides the insertion of the tool 1 is provided at the tip portion of the claw 2 on the opposite side.

  The rotating cylinder 4 to be screwed into the proximal end side threaded portion 17 of the proximal end cylindrical body 15 has a predetermined thickness notch on the upper side of the inner peripheral surface thereof, thereby inserting the insertion rod 6 protruding from the peripheral surface opening 24. Receiving stepped portions (locking surfaces 11) for receiving the both end portions are formed.

  Further, an annular body 7 fixed to the rotating cylinder 4 is provided between the proximal end cylinder 15 and the rotating cylinder 4, and the annular body 7 includes the insertion hole 6 (the circumferential surface opening portion). Two recesses 8 are provided over a predetermined width in which both end portions (each projecting from 24) are disposed.

  The bottom surface 9 of the recess 8 is set as an opposing clamping surface that faces the locking surface 11 that locks the insertion rod 6 of the rotating cylinder 4 and clamps the insertion rod 6. The contact prevention surface is configured to prevent the relative rotation between the insertion rod 6 and the rotating cylinder 4 and the ring body 7 by contacting the insertion rod 6.

  Accordingly, the insertion rod 6 held between the rotating cylinder 4 and the ring body 7 moves integrally with the rotating cylinder 4. That is, when the rotary cylinder 4 is rotated with respect to the proximal end cylinder 15 and moved forward and backward along with the rotary cylinder 4 when the rotary cylinder 4 is rotated forward and backward, the interlocking body 5 through which the insertion rod 6 is inserted is also provided. Move together.

  Therefore, the interlocking body 5 moves back and forth in accordance with the rotation of the rotating cylinder 4 and the claw 2 moves back and forth along the groove 77 of the claw holding portion 27, so that the claw 2 can be advanced and retracted. Specifically, as illustrated in FIGS. 5 and 6, after the rotating cylinder 4 is rotated to retract the interlocking body 5, the claw 2 is enlarged, and the tool 1 is inserted between the edge portions 31 of the claw 2. As shown in FIGS. 7 and 8, the rotating cylinder 4 is rotated to the opposite side, the interlocking body 5 is advanced, and the claw 2 is closed, whereby the tool 1 can be clamped.

  Further, the rotation range of the rotating cylinder 4 is limited to the range until the insertion rod 6 comes into contact with each side surface 10 of the concave portion 8 of the annular body 7 that becomes the expansion range limiting portion (the rotating cylinder 4 is inserted) The flange 6 can rotate until it comes into contact with the side surface 10 of the recess 8 of the ring body 7), and the relative rotation range of the insertion rod 6 with respect to the rotating cylinder 4 depends on the formation width of the recess 8 of the ring body 7. Can be defined.

  Accordingly, by adjusting the formation width of the recess 8 of the ring body 7, the rotation range of the rotating cylinder 4 is adjusted, and the interlocking body 5 that moves back and forth according to the rotation of the rotating cylinder 4 moves back and forth. The range, that is, the maximum expansion range of the nail 2 can be adjusted.

  Therefore, by preparing a plurality of types of ring bodies 7 having different formation widths of the recesses 8 and replacing the ring body 7 according to the diameter of the tool 1 to be sandwiched, the enlarged range of the claw 2 is always set to the diameter of the tool 1. A suitable range can be obtained. For example, as in Example 1 illustrated in FIG. 9, by replacing the ring body 7 with the width of formation of the recess 8 wider than that in FIG. 3, the expanded range of the claw 2 can be increased without replacing other members. It becomes possible to expand from FIG.

  Further, the nail 2 is expanded so that the tool 1 can be inserted between the edge portions 31 of the nail 2 when the nail 2 is expanded to the maximum, and the interval Y between the inclined side surfaces 30 of the nail 2 is the diameter of the tool 1. It is preferable to set a range smaller than X (see FIG. 10). Specifically, when the claw 2 is expanded to the maximum, a clamping space having a width slightly larger than or substantially the same as the diameter of the tool 1 is formed between the edge portions 31.

  Note that various means such as screwing or press-fitting can be employed as the means for fixing the ring body 7 and the rotating cylinder 4.

  Further, as in another example 2 shown in FIG. 12, the edge 31 of the claw 2 may be chamfered. That is, a configuration in which a chamfered portion 13 having a chamfered edge formed at an intersecting ridge line between the inclined side surfaces 30 may be provided. In this case, the amount of expansion of the claw 2 with respect to the diameter of the tool 1 can be changed according to the chamfering amount of the edge, and for example, by replacing the claw 2 with a different chamfering amount without replacing the ring body 7 as described above, The expansion range of the claw 2 can be set to a range suitable for the diameter of the tool 1 or the like.

  Further, as in another example 3 shown in FIGS. 13 to 15, an interposed member 12 is interposed between the proximal end portion of the claw 2 and the distal end portion of the interlocking body 5, and the thickness of the interposed member 12 is increased. You may comprise so that the retraction range of the said nail | claw 2 can be adjusted by adjusting the height. The interposition member 12 has an annular shape and is provided with projecting portions 32 projecting inward into the slit portions 26, respectively.

  Specifically, the interposed member 12 is provided on the base portion 25 on the base end side of the slit portion 26, and the retraction amount of the claw 2 is limited by the thickness of the interposed member 12. good. That is, the interposition member 12 prevents further retraction of the claw 2 even if the front end surface of the interlocking member 5 is retracted from the front end surface of the interposition member 12 as shown in FIG. In this case, the amount of enlargement of the claw 2 can be changed according to the thickness of the interposed member 12. For example, the claw 2 can be enlarged by replacing the interposed member 12 with a different thickness without replacing the ring 7. The range can be set to a range suitable for the diameter of the tool 1 or the like.

  It should be noted that the amount of retraction of the claw 2 may be adjusted by changing the length of the distal end portion of the interlocking body 5 without being limited to the intervening member 12, but various types of interlocking bodies 5 having different lengths of the distal end portion. It is easier and more preferable to prepare many kinds of intervening members 12 with different thicknesses than to prepare the above. Further, without providing the concave portion 8 in the ring body 7, a concave portion or a convex portion is provided in a portion facing the lower surface or the outer peripheral surface of the ring body 7 in the rotating cylinder 4, and the inner side surface of the concave portion or the side surface of the convex portion. It is good also as a structure which restrict | limits the rotation range of the rotation cylinder 4 by making this insertion rod 6 contact | abut and preventing rotation of this insertion rod 6. FIG. In this case, it can be set as the structure which does not provide the ring body 7. FIG. That is, for example, the rotating cylinder 4 can be configured as a divided body, or a groove portion through which the insertion rod 6 can pass is provided in the rotating cylinder 4 so as to reach the recess. Specifically, the rotating cylinder 4 is divided into halves, a groove for forming the recess is formed on the inner peripheral surface of the divided body, and the ends of the insertion rod 6 are accommodated in the groove together. It is set as the structure connected, The groove | channel (recessed part which controls the rotation range of the edge part of the insertion rod 6) along the circumferential direction on the inner peripheral surface of the rotation cylinder 4, and the groove | channel (insertion rod 6 are made into said recessed part) orthogonal to this For example, the ring body 7 can be made unnecessary.

  Since the first embodiment is configured as described above, the rotating body 4 is rotated to retract and enlarge the claw 2 and the tool 1 is inserted between the edge portions 31 of the claw 2, and then the claw 2 is moved forward and down to reduce the tool. 1 is clamped by the edge portion 31 of the claw 2, the claw 2 is moved forward and backward by the advancement and retraction of the interlocking body 5, so that the claw 2 is advanced and retracted. However, the insertion of the tool 1 between the edges 31 of the claw 2 is facilitated.

  Moreover, when the tool 1 is inserted between the edge portions 31 of the claw 2, the tool 1 is surely prevented from entering between the inclined side surfaces 30 of the claw 2 by limiting the maximum expansion range of the claw 2 by the expansion range limiting portion. be able to. Therefore, it is not necessary for the operator to carefully perform the claw enlargement operation so that the tool 1 does not enter between the inclined side surfaces 30 of the claw 2 one by one, and the tool 1 is simply inserted between the edge portions 31 by enlarging the claw 2 to the maximum enlargement range. It is only necessary to do so, and even the small-diameter tool 1 can be easily and securely held between the edges of the claw 2.

  Therefore, the first embodiment is extremely excellent in workability in that the small-diameter tool is prevented from being pinched by the side surface of the nail and can be securely pinched by the edge of the nail.

  A specific second embodiment of the present invention will be described with reference to FIGS.

  In the second embodiment, the rotating body 4 fitted to the main body 3 of the first embodiment is not provided, and the interlocking body operating body 50 provided inside the main body 3 is operated to screw the interlocking body 5 to a screw mechanism. This is an example in which the advancing and retreating movement is used.

  Specifically, in the second embodiment, as illustrated in FIG. 16, the interlocking operation body 50 is directly operated by operating the portion exposed from the main body 3 of the interlocking body operation body 50 (the grip portion 54 provided on the body 3). To do.

  On the inner peripheral surface of the distal end of the cylindrical interlocking body operating body 50, there is provided a screwing portion 51 that is screwed with a screw portion 52 formed on the base end outer peripheral surface of the interlocking body 5. Since the interlocking body operating body 50 is positioned by the claw holder, the interlocking body 5 rotates when the rotating operation is performed, and the interlocking body 5 is screwed forward or backward with respect to the interlocking body operating body 50. Reference numeral 53 denotes a ball bearing.

  At this time, by appropriately setting the distance between the distal end surface of the interlocking body operating body 50 and the base end surface of the bulging portion 61 at the distal end of the interlocking body 5, the expansion range of the nail 2 can be limited (see FIG. 17). ). In the example shown in FIGS. 16 and 17, the distal end side of the interlocking body operating body 50 is elongated to narrow the interval between the interlocking body operating body 50 and the interlocking body 5, thereby limiting the expansion range of the claw 2.

  In another example 4 shown in FIG. 18, the ring-shaped member 60 that restricts the expansion range of the claw 2 according to the thickness is connected to the interlocking body operating body 50 and the interlocking body 5 in the same manner as the intervention member 12 of the first embodiment. The range of expansion of the claw 2 is limited by being provided between the two.

  In another example 5 shown in FIG. 19, by extending the bulging portion 61, the interval between the interlocking body operating body 50 and the interlocking body 5 is narrowed to limit the expansion range of the nail 2. .

  The rest is the same as in Example 1.

  A specific third embodiment of the present invention will be described with reference to FIGS.

  The third embodiment is an example in which the interlocking body 5 is screwed forward and backward using a worm gear mechanism including a worm gear 56 and a worm wheel 57.

  Specifically, as shown in FIGS. 20 and 21, the worm gear 56 is rotatably provided on a holding member 62 fixed to the main body 3 in a non-rotatable state, and the worm gear 56 held by the holding member 62. A worm wheel 57 that meshes with 56 is provided on the base end side of the interlocking body 5. In addition, a screwing portion 63 that is screwed with a screw portion 64 on the outer periphery of the bulging portion 61 on the tip end side of the interlocking body 5 is provided at the tip portion of the holding member 62.

  Therefore, by rotating the worm gear 56 using an operation tool such as a hexagon wrench, the interlocking body 5 can be screwed and moved forward and backward. Reference numeral 55 denotes a cover body, 58 denotes a fitting hole into which the operating tool is fitted, and 59 denotes an insertion hole for inserting the operating tool. The main body 3 according to the third embodiment includes a proximal end cylindrical body 15, a distal end cover body 16, and a cover body 55. The base end cylinder 15 may be extended to the outer periphery of the holding member 62 without providing the cover body 55.

  In Example 3, the distance between the base end surface of the bulging portion 61 of the interlocking body 5 and the facing surface 65 provided on the base end side of the screwing portion 63 of the holding member 62 facing the bulging portion 61 is set. For example, the expansion range of the nail | claw 2 can be restrict | limited by adjusting by setting the length of the bulging part 61 of the interlocking | linkage body 5 suitably (refer FIG. 22).

  The rest is the same as in Example 1.

  A specific fourth embodiment of the present invention will be described with reference to FIGS.

  The fourth embodiment is an example in which the interlocking body 5 is moved forward and backward by a cam mechanism, and the interlocking body 5 is moved forward and backward by operating a cam provided inside the main body 3 with an operating tool.

  Specifically, as shown in FIGS. 23 and 24, the large-diameter portion 67 of the cam cannot be removed from the cam holding portion 69 of the fixed side member 66 fixed to the main body 3 in a non-rotatable state. A small-diameter portion 68 provided so as to be movable (spinning) and eccentric to the large-diameter portion 67 of the cam is projected into an engagement hole 70 having a rectangular shape in a sectional view provided in the interlocking body 5. Provided. Note that the engagement hole 70 may have a long hole shape.

  The outer peripheral diameter of the hook-shaped base end portion of the interlocking member 5 is substantially the same as the inner peripheral diameter of the small-diameter portion 76 of the fixed side member 66, and the interlocking member 5 passes through the fixed-side member 66 along the small-diameter portion 76. It is configured to be slidable. The vertical width of the small-diameter engaging hole 70 is set to be approximately the same as the diameter of the small-diameter portion 68 of the cam. Therefore, the rotational motion of the small-diameter portion 68 of the cam is converted into a vertical motion (advance / retreat motion) that moves the interlocking member 5 up and down.

  Reference numeral 71 denotes a rotating shaft of the cam, 72 denotes a fitting hole into which the operating tool is fitted, 73 denotes an insertion hole for inserting the operating tool, and 74 denotes a cover body. The main body 3 according to the fourth embodiment includes a proximal end cylinder 15, a distal end cover body 16, and a cover body 74. The base end cylinder 15 may be extended to the outer periphery of the stationary member 66 without providing the cover 74.

  Therefore, by inserting an operating tool such as a hexagon wrench through the insertion hole 73 and fitting it into the fitting hole 72 to rotate the cam, the interlocking member 5 can be moved back and forth by the cam mechanism.

  In the fourth embodiment, the distance between the base end surface of the bulging portion 61 of the interlocking body 5 and the facing surface 75 of the fixed-side member 66 facing the bulging portion 61 is, for example, the distance between the bulging portion 61 of the interlocking body 5. By adjusting the length by appropriately setting, the expansion range of the nail 2 can be limited (see FIG. 25).

  The rest is the same as in Example 1.

DESCRIPTION OF SYMBOLS 1 Object to be clamped 2 Claw 3 Body 4 Rotating cylinder 5 Interlock
30 Inclined side
31 Edge
33 Chamfer

Claims (10)

  A main body having a plurality of claws at the tip thereof for clamping the object to be clamped is provided with a claw advance / retreat / expansion / reduction portion for advancing / retracting the claw, and the claw is provided with a pair of inclined side surfaces. The chuck device is provided with an edge portion for clamping the peripheral surface of the object to be clamped, and the claw advance / retract portion is an interlocking body that engages with the claw, and a forward / backward movement that moves the interlocking body forward / backward. A claw enlargement range restricting section is provided for restricting the retraction range of the claw and restricting the maximum enlargement range of the claw to a range in which the object to be clamped does not enter between the inclined side surfaces. A chuck device characterized by comprising:   2. The chuck device according to claim 1, wherein the claw enlargement range limiting portion has a maximum enlargement range of the claw, wherein an interval between inclined side surfaces of each claw is less than a diameter of an object to be sandwiched inserted between the edge portions. It is comprised so that it may carry out. Chuck apparatus characterized by the above-mentioned.   3. The chuck device according to claim 1, wherein the chuck device clamps the object to be clamped having a diameter of 0.5 mm or less.   4. The chuck device according to claim 1, wherein a chamfered portion for facilitating insertion of the object to be clamped is formed on a tip end side of the edge portion of each claw. 5. A chuck device characterized by that.   5. The chuck device according to claim 1, wherein the advance / retreat mechanism is a screw mechanism that advances and retracts the interlocking body by screwing. 6.   5. The chuck device according to claim 1, wherein the advance / retreat mechanism is a cam mechanism that moves the interlocking member forward and backward by a cam.   6. The chuck device according to claim 5, wherein the advancing / retreating mechanism rotates the interlocking body by rotating a rotating cylinder provided in the main body or rotating an interlocking body exposed from the main body. A chuck device characterized in that:   The chuck device according to any one of claims 5 and 6, wherein the interlocking body is moved forward and backward by operating the screw mechanism or the cam mechanism provided inside the main body by an operating tool. A chuck device characterized by that.   9. The chuck device according to claim 1, wherein the edge portion is chamfered.   10. The chuck device according to claim 1, wherein the claws are three claws arranged radially. 10.

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