CN101224504A - Self centering chuck - Google Patents
Self centering chuck Download PDFInfo
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- CN101224504A CN101224504A CNA2008100185248A CN200810018524A CN101224504A CN 101224504 A CN101224504 A CN 101224504A CN A2008100185248 A CNA2008100185248 A CN A2008100185248A CN 200810018524 A CN200810018524 A CN 200810018524A CN 101224504 A CN101224504 A CN 101224504A
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Abstract
The invention relates to a self-centering chuck, comprising a chuck body; the chuck body is provided with a claw mechanism used for clamping the workpiece, an adjusting mechanism used for adjusting the state of the claw mechanism, and a self-centering mechanism used for controlling all claws of the claw mechanism to motion with equal distances at the center of the chuck; the top of the chuck body is provided with an opening which is convenient for the let-in and take-out of the workpiece; the opening passes through the thickness of the chuck body. After the opening-typed self-centering chuck is arranged on a displacement machine, the workpiece can be vertically hoisted to the center of the chuck and clamped by the self-centering of the chuck; the workpiece is not required to mover axially; therefore, the clamp mounting working procedure is reduced, the clamp mounting time is saved, the auxiliary axial motion device is not required, and the cost of the equipment is reduced.
Description
Technical field
The present invention relates to a kind of mechanically chuck of usefulness that becomes, especially a kind of self-centering chuck.
Background technology
Existing self-centering chuck generally includes two types of three-jaw self-centering chuck and self-centering four-jaw independent chucks, and the claw of these two types of self-centering chucks all is arranged on the complete disk, and can equidistantly move relative to chuck hub.This self-centering chuck is installed on lathe, when general displacements such as weldering bed etc. are mechanically used, cylindrical work is realized being installed if want, must winch to the chuck side by lifting machine earlier, again through an axially-movable, just can clamp after making workpiece insert chuck, all adopt this mode at present both at home and abroad basically.There is two large problems in this mode, and this kind of first mode that is installed must winch to the chuck side with workpiece earlier, just can finish being installed of workpiece through this operation of axially-movable again, and operation increases, and workpiece is big more, and efficient is low more; It two is for the use occasion that has, this kind self-centering chuck is difficult to be competent at, for example when the length of workpiece greater than chuck and top between distance, this moment is if adopt traditional chuck so, need to increase auxiliary axial-movement devices, perhaps earlier dismounting lathe top waited parts, workpiece is inserted chuck carries out clamping, reinstalls parts such as top then, very big influence operating efficiency.
Summary of the invention
The self-centering chuck that the purpose of this invention is to provide a kind of open type, promptly the top of chuck offers the self-centering chuck of opening.
The present invention can be implemented by the following technical programs: a kind of self-centering chuck, comprise chuck body, have the governor motion that is used for the click-on mechanism of workpiece chucking, is used to adjust the state of described click-on mechanism on the described chuck body, be used to control the self-centering mechanism of the relative chuck hub isometric exercise of each claw of described click-on mechanism, the top of described chuck body offers the opening that convenient described workpiece is put into and taken out, and described opening runs through the thickness of described chuck body.
Described click-on mechanism comprises three or four fixed heads that are fixedly installed on the described chuck body, all has sliding ditch on described each fixed head, all slide in the described sliding ditch and be provided with slide plate, all be fixed with the claw that is used for the workpiece chucking on the described slide plate.
Described self-centering mechanism comprises two levers that are arranged between adjacent two claws, wherein an end of a described lever is connected with a claw, one end of the described lever of another root is connected with another claw, and the other end of two described levers connection that rotates;
Two described levers all rotate with described chuck body by the rotating shaft that is arranged on its rotational axis line and are connected; Two described levers match and can control adjacent two described claw isometric exercises.
All offer chute on the both ends of two described levers, all slide in the described chute and be provided with slide block, by the connecting axle connection that rotates, realize rotating and being slidingly connected between two the other end of two described levers thus between two slide blocks at place, the other end of two described levers; Two slide blocks at the place, one end of two described levers rotate with described claw by fulcrum respectively and are connected, and realize two one ends of two described levers and rotating and being slidingly connected of described claw thus.
The axial line that is positioned at the fulcrum on the end of a described lever to the distance of the rotational axis line of this lever be a1, the axial line that is positioned at the connecting axle on the other end of a described lever is a2 to the distance of the rotational axis line of this lever, the axial line that is positioned at the fulcrum on the end of the described lever of another root to the distance of the rotational axis line of this lever be b1, the axial line that is positioned at the connecting axle of the described lever of another root the other end is b2 to the distance of the rotational axis line of this lever, and has
Relation.
Two described levers are bascule, and the relation of a1=a2=b1=b2 is arranged.
Described fulcrum and described claw fix setting.
Be fixed with fixed head on the described chuck body, has sliding ditch on the described fixed head, slide in the described sliding ditch and be provided with slide plate, be fixed with the claw that is used for the workpiece chucking on the described slide plate, described fulcrum is fixed on the described slide plate, and described fulcrum fixes setting by described slide plate and described claw.
Be fixed with vertical rod on the described fulcrum, offer pilot hole on the described fixed head, what described vertical rod can plug is plugged in the described pilot hole, and the part of described vertical rod outer surface between described slide plate and fixed head is arranged with spring.
Described governor motion comprises and rotates the leading screw be arranged on the described chuck body, is fixed on the nut on the described slide plate, the end of thread of described leading screw revolves and is located in the described nut, when described leading screw during, can promote described slide plate and in described sliding ditch, slide by turn.
Compared with the prior art the present invention has following advantage: the self-centering chuck of this kind open type is installed on after the displacement mechanically, workpiece can vertically winch to the center of chuck and adopt the chuck self-centering clamping then, workpiece does not need through moving axially, reduced the operation that is installed on the one hand, saved the time of being installed, need not the axial-movement devices of assisting on the other hand, reduced the cost of equipment.
Description of drawings
Fig. 1 is the front view of scroll chuck embodiment of the present invention;
Fig. 2 is the rearview of Fig. 2;
Fig. 3 is the A-A direction sound view among Fig. 1;
Fig. 4 is the rearview of chuck embodiment of the present invention.
Wherein: 1, chuck body, 2, opening,
4, click-on mechanism, 41, fixed head, 42, sliding ditch, 43, slide plate, 44, claw,
5, self-centering mechanism, 51, lever, 52, rotating shaft, 53, chute, 54, slide block, 55, connecting axle, 56, fulcrum,
6, governor motion, 61, leading screw, 62, nut, 64, vertical rod, 65, spring, 66, pilot hole,
7, workpiece.
The specific embodiment
Referring to Fig. 1, a kind of self-centering chuck, comprise chuck body 1, have the governor motion 6 that is used for the click-on mechanism 4 of workpiece 7 chucking, is used to adjust the state of described click-on mechanism 4 on the described chuck body 1, be used to control the self-centering mechanism 5 of each claw 44 relative chuck hub isometric exercises of described click-on mechanism 4.In addition, the top of described chuck body 1 offers the opening 2 that convenient described workpiece 7 is put into and taken out, described opening 2 runs through the thickness of described chuck body 1, and the size of described opening 2 should guarantee can pass through described opening 2 for the workpiece 7 of the maximum gauge of click-on mechanism 4.Because the setting of described opening 2, workpiece 7 can directly lift to the center of chuck and be installed, and is directly from the center taking-up of chuck, very convenient during taking-up.
Simultaneously, because the setting of described opening 2, the corresponding change can take place in described click-on mechanism 4, governor motion 6, self-centering mechanism 5.
Referring to Fig. 1, described click-on mechanism 4 comprises three fixed heads 41 that are fixedly installed on the described chuck body 1, all has sliding ditch 42 on described each fixed head 41, all slide in the described sliding ditch 42 and be provided with slide plate 43, all be fixed with the claw 44 that is used for workpiece 7 chuckings on the described slide plate 43.The sliding ditch 42 of preferred this kind, slide plate 43 structures among the present invention, rather than traditional flat thread form are mainly limited by architectural feature of the present invention.
Described governor motion 6 is used to make described slide plate 43 to slide in described sliding ditch 42, described governor motion 6 comprises and rotates the leading screw 61 be arranged on the described chuck body 1, is fixed on the nut 62 on the described slide plate 43, the end of thread of described leading screw 61 revolves and is located in the described nut 62, when described leading screw 61 during by turn, since described leading screw 61 cannot be described relatively chuck body 1 motion, thereby can promote described slide plate 43 and in described sliding ditch 42, slide.And because the white lock effect of the screw thread between described leading screw 61 and the nut 62, even described leading screw 61 is removed power, described slide plate 43 still can be locked in the described sliding ditch 42.In the present embodiment, only in three slide plates 43 is provided with governor motion 6, its reason is that present embodiment also has makes the self-centering mechanism 5 of three claws, 44 relative chuck hub isometric exercises, therefore only need to regulate a claw 44, other two claws 44 will movement therewith.
Referring to Fig. 2, described self-centering mechanism 5 comprises two lever 51a that are arranged between adjacent two claws 44,51b, wherein the end of a described lever 51a is connected with a claw 44, the end of the described lever 51b of another root is connected with another claw 44, and two described lever 51a, the connection that rotates of the other end of 51b, two described lever 51a, 51b all rotates with described chuck body 1 by the rotating shaft 52 that is arranged on its rotational axis line and is connected two described lever 51a, 51b matches and can control adjacent two described claw 44 isometric exercises.The principle that two described lever 51a, 51b match is as follows: all offer chute 53 on the both ends of two described lever 51a, 51b, all slide in the described chute 53 and be provided with slide block 54, described slide block 54 can slide with respect to described chute 53, by connecting axle 55 connection that rotates, realize rotating and being slidingly connected between two the other end of two described lever 51a, 51b thus between two slide blocks 54 at place, the other end of two described lever 51a, 51b; Two slide blocks 54 at place, the end of two described lever 51a, 51b rotate with described claw 44 by fulcrum 56 respectively and are connected, and realize two one ends of two described lever 51a, 51b and rotating and being slidingly connected of described claw 44 thus.Thus, when the claw 44 that is positioned at described lever 51a one end moves, must drive claw 44 motions that are positioned at the described lever 51b of another root one end.The axial line that definition is positioned at the fulcrum 56 on the end of a described lever 51a to the distance of the rotational axis line of this lever 51a be a1, the axial line that is positioned at the connecting axle 55 on the other end of a described lever 51a is a2 to the distance of the rotational axis line of this lever 51a, the axial line that is positioned at the fulcrum 56 on the end of the described lever 51b of another root to the distance of the rotational axis line of this lever 51b be b1, the axial line that is positioned at the connecting axle 55 of the described lever 51b of another root the other end is b2 to the distance of the rotational axis line of this lever 51b, works as existence
Concern the time, be positioned at that the claw 44 of described lever 51a one end is inevitable to have the identical move distance of relative chuck hub with the claw 44 that is positioned at described lever 52a one end of another root.As a preferred embodiment, two described lever 51a, 51b are bascule, in fact, the described lever 52 of each root that is arranged in Fig. 2 is bascule and isometric, promptly there is a1=a2=b1=b2 relation, makes three described claws 44 chuck hub isometric exercise relatively thus.
Again further, referring to Fig. 3, described fulcrum 56 is fixedly connected with described slide plate 43, has realized that thus described fulcrum 56 fixes setting with described claw 44.Be fixed with vertical rod 64 on the described fulcrum 56, offer pilot hole 66 on the described fixed head 41, what described vertical rod 64 can plug is plugged in the described pilot hole 66, and the part of described vertical rod 64 outer surfaces between described slide plate 43 and fixed head 41 is arranged with spring 65.Being provided with of described vertical rod 64 can further be played guiding and spacing effect to described claw 44, and described spring 65 be in for a long time the compression or elongation state in a kind of, can eliminate the gap between described leading screw 61 and the nut 62, make this chuck have higher degree of regulation.
Referring to Fig. 4, the difference of this embodiment and a last embodiment is, a last embodiment is a scroll chuck, and this embodiment is a chuck, described click-on mechanism 4 comprises four fixed heads 41 that are fixedly installed on the described chuck body 1, all has sliding ditch 42 on described each fixed head 41, all slide in the described sliding ditch 42 and be provided with slide plate 43, all be fixed with the claw 44 that is used for workpiece 7 chuckings on the described slide plate 43, its four described claws 44 also are to regulate by above-mentioned self-centering mechanism 5.
Claims (10)
1. self-centering chuck, comprise chuck body (1), each claw (44) that have the governor motion (6) that is used for the click-on mechanism (4) of workpiece (7) chucking, is used to adjust the state of described click-on mechanism (4) on the described chuck body (1), is used to control described click-on mechanism (4) is the self-centering mechanism (5) of chuck hub isometric exercise relatively, it is characterized in that: the top of described chuck body (1) offers the opening (2) that convenient described workpiece (7) is put into and taken out, and described opening (2) runs through the thickness of described chuck body (1).
2. self-centering chuck according to claim 1, it is characterized in that: described click-on mechanism (4) comprises three or four fixed heads (41) that are fixedly installed on the described chuck body (1), all has sliding ditch (42) on described each fixed head (41), all slide in the described sliding ditch (42) and be provided with slide plate (43), all be fixed with the claw (44) that is used for workpiece (7) chucking on the described slide plate (43).
3. self-centering chuck according to claim 1, it is characterized in that: described self-centering mechanism (5) comprises two levers (51a, 51b) that are arranged between adjacent two claws (44), wherein an end of a described lever (51a) is connected with a claw (44), one end of the described lever of another root (51b) is connected with another claw (44), and the other end of two described levers (51a, 51b) connection that rotates;
Two described levers (51a, 51b) all rotate with described chuck body (1) by the rotating shaft (52) that is arranged on its rotational axis line and are connected;
Two described levers (51a, 51b) match and can control adjacent two described claws (44) isometric exercise.
4. self-centering chuck according to claim 3, it is characterized in that: all offer chute (53) on the both ends of two described levers (51a, 51b), all slide in the described chute (53) and be provided with slide block (54), by connecting axle (55) connection that rotates, realize rotating and being slidingly connected between two the other end of two described levers (51a, 51b) thus between two slide blocks (54) at place, the other end of two described levers (51a, 51b); Two slide blocks (54) at the place, one end of two described levers (51a, 51b) rotate with described claw (44) by fulcrum (56) respectively and are connected, and realize two one ends of two described levers (51a, 51b) and rotating and being slidingly connected of described claw (44) thus.
5. self-centering chuck according to claim 4, it is characterized in that: the axial line that is positioned at the fulcrum (56) on the end of a described lever (51a) is a1 to the distance of the rotational axis line of this lever (51a), the axial line that is positioned at the connecting axle (55) on the other end of a described lever (51a) is a2 to the distance of the rotational axis line of this lever (51a), the axial line that is positioned at the fulcrum (56) on the end of the described lever of another root (51b) is b1 to the distance of the rotational axis line of this lever (51b), the axial line that is positioned at the connecting axle (55) of the described lever of another root (51b) the other end is b2 to the distance of the rotational axis line of this lever (51b), and has
Relation.
6. self-centering chuck according to claim 5 is characterized in that: two described levers (51a, 51b) are bascule, and the relation of a1=a2=b1=b2 is arranged.
7. self-centering chuck according to claim 4 is characterized in that: described fulcrum (56) fixes setting with described claw (44).
8. self-centering chuck according to claim 7, it is characterized in that: be fixed with fixed head (41) on the described chuck body (1), has sliding ditch (42) on the described fixed head (41), slide in the described sliding ditch (42) and be provided with slide plate (43), be fixed with the claw (44) that is used for workpiece (7) chucking on the described slide plate (43), described fulcrum (56) is fixed on the described slide plate (43), and described fulcrum (56) fixes setting by described slide plate (43) and described claw (44).
9. self-centering chuck according to claim 8, it is characterized in that: be fixed with vertical rod (64) on the described fulcrum (56), offer pilot hole (66) on the described fixed head (41), what described vertical rod (64) can plug is plugged in the described pilot hole (66), and the part that described vertical rod (64) outer surface is positioned between described slide plate (43) and the fixed head (41) is arranged with spring (65).
10. according to claim 2 or 8 described self-centering chucks, it is characterized in that: described governor motion (6) comprises and rotates the leading screw (61) be arranged on the described chuck body (1), is fixed on the nut (62) on the described slide plate (43), the end of thread of described leading screw (61) revolves and is located in the described nut (62), when described leading screw (61) during, can promote described slide plate (43) and in described sliding ditch (42), slide by turn.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100185248A CN101224504B (en) | 2008-02-20 | 2008-02-20 | Self centering chuck |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100185248A CN101224504B (en) | 2008-02-20 | 2008-02-20 | Self centering chuck |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101224504A true CN101224504A (en) | 2008-07-23 |
| CN101224504B CN101224504B (en) | 2010-06-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100185248A Active CN101224504B (en) | 2008-02-20 | 2008-02-20 | Self centering chuck |
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| Country | Link |
|---|---|
| CN (1) | CN101224504B (en) |
Cited By (23)
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| CN102600752A (en) * | 2012-03-27 | 2012-07-25 | 无锡东润电子材料科技有限公司 | Resin component mixer |
| CN102628773A (en) * | 2012-04-19 | 2012-08-08 | 山西潞安环保能源开发股份有限公司 | Universal centering device |
| CN103105187A (en) * | 2011-11-11 | 2013-05-15 | 上海宝信软件股份有限公司 | Three-claw centering device |
| CN103624472A (en) * | 2013-12-06 | 2014-03-12 | 昆山华恒焊接股份有限公司 | Chuck clamping device |
| CN103978389A (en) * | 2014-04-10 | 2014-08-13 | 李汉祥 | Wedge force increasing inner hole clamping mechanism |
| CN104552068A (en) * | 2014-12-29 | 2015-04-29 | 爱彼思（苏州）自动化科技有限公司 | Automatic locating mechanism for camera lens ring |
| CN105171323A (en) * | 2015-07-22 | 2015-12-23 | 山东豪迈重工有限公司 | Open-type three-jaw self-centering rotation device |
| CN105171324A (en) * | 2015-07-22 | 2015-12-23 | 山东豪迈重工有限公司 | Three-jaw self-centering chuck clamping device |
| CN105397395A (en) * | 2015-12-02 | 2016-03-16 | 山东豪迈重工有限公司 | U-type self-centering slewing device adopting clamping jaws |
| CN105397394A (en) * | 2015-12-02 | 2016-03-16 | 山东豪迈重工有限公司 | U-type self-centering slewing device adopting clamping bars |
| CN105857924A (en) * | 2016-06-03 | 2016-08-17 | 章潇雨 | Novel elastic chuck |
| CN105945317A (en) * | 2016-05-29 | 2016-09-21 | 广东技术师范学院 | Axial length adjusting fixture device for lathe |
| CN106003138A (en) * | 2016-06-14 | 2016-10-12 | 东莞市联洲知识产权运营管理有限公司 | Flexible guiding device applied to lifting shaft of robot |
| CN106975763A (en) * | 2017-05-01 | 2017-07-25 | 桐乡市百宝电子商务有限公司 | A kind of jack catchs type centering and clamping apparatus |
| CN109866289A (en) * | 2019-04-02 | 2019-06-11 | 六安市恒伟标识有限公司 | The high-precision multiaxial type automatic turning technique of timber |
| CN110539088A (en) * | 2019-09-24 | 2019-12-06 | 济南邦德激光股份有限公司 | Chuck transmission structure for laser cutting machine |
| CN110549277A (en) * | 2019-10-14 | 2019-12-10 | 李长春 | Workpiece concentric clamping device and clamping method |
| CN111390213A (en) * | 2020-04-16 | 2020-07-10 | 胡炜凯 | Numerical control machine tool chuck mechanism with workpiece capable of being popped out quickly |
| CN111912321A (en) * | 2020-09-14 | 2020-11-10 | 青岛约克运输设备有限公司 | Inner hole coaxiality gauge |
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| CN1031037A (en) * | 1987-08-05 | 1989-02-15 | 第比利斯机床制造特殊工艺设计局 | Four-jaw self-centering chuck |
| IT1233600B (en) * | 1989-05-30 | 1992-04-06 | Pinto Spa Mario | SELF-CENTERING WITH BALANCED JAWS |
| CN2275912Y (en) * | 1996-05-14 | 1998-03-11 | 李瑞良 | Composite jaw of three-jaw chuck |
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| CN103105187B (en) * | 2011-11-11 | 2015-12-09 | 上海宝信软件股份有限公司 | A kind of Three-claw centering device |
| CN103105187A (en) * | 2011-11-11 | 2013-05-15 | 上海宝信软件股份有限公司 | Three-claw centering device |
| CN102600752B (en) * | 2012-03-27 | 2014-06-25 | 无锡东润电子材料科技有限公司 | Resin component mixer |
| CN102600752A (en) * | 2012-03-27 | 2012-07-25 | 无锡东润电子材料科技有限公司 | Resin component mixer |
| CN102628773A (en) * | 2012-04-19 | 2012-08-08 | 山西潞安环保能源开发股份有限公司 | Universal centering device |
| CN103624472A (en) * | 2013-12-06 | 2014-03-12 | 昆山华恒焊接股份有限公司 | Chuck clamping device |
| CN103978389A (en) * | 2014-04-10 | 2014-08-13 | 李汉祥 | Wedge force increasing inner hole clamping mechanism |
| CN104552068A (en) * | 2014-12-29 | 2015-04-29 | 爱彼思（苏州）自动化科技有限公司 | Automatic locating mechanism for camera lens ring |
| CN105171323A (en) * | 2015-07-22 | 2015-12-23 | 山东豪迈重工有限公司 | Open-type three-jaw self-centering rotation device |
| CN105171324A (en) * | 2015-07-22 | 2015-12-23 | 山东豪迈重工有限公司 | Three-jaw self-centering chuck clamping device |
| CN105171324B (en) * | 2015-07-22 | 2017-09-29 | 山东豪迈机械制造有限公司 | Three-jaw self-centering chuck clamping device |
| CN105397395A (en) * | 2015-12-02 | 2016-03-16 | 山东豪迈重工有限公司 | U-type self-centering slewing device adopting clamping jaws |
| CN105397394A (en) * | 2015-12-02 | 2016-03-16 | 山东豪迈重工有限公司 | U-type self-centering slewing device adopting clamping bars |
| CN105945317A (en) * | 2016-05-29 | 2016-09-21 | 广东技术师范学院 | Axial length adjusting fixture device for lathe |
| CN105857924A (en) * | 2016-06-03 | 2016-08-17 | 章潇雨 | Novel elastic chuck |
| CN106003138A (en) * | 2016-06-14 | 2016-10-12 | 东莞市联洲知识产权运营管理有限公司 | Flexible guiding device applied to lifting shaft of robot |
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| CN106975763A (en) * | 2017-05-01 | 2017-07-25 | 桐乡市百宝电子商务有限公司 | A kind of jack catchs type centering and clamping apparatus |
| CN109866289A (en) * | 2019-04-02 | 2019-06-11 | 六安市恒伟标识有限公司 | The high-precision multiaxial type automatic turning technique of timber |
| CN110539088A (en) * | 2019-09-24 | 2019-12-06 | 济南邦德激光股份有限公司 | Chuck transmission structure for laser cutting machine |
| CN110549277B (en) * | 2019-10-14 | 2020-09-18 | 上海翼克机器人有限公司 | Workpiece concentric clamping device and clamping method |
| CN110549277A (en) * | 2019-10-14 | 2019-12-10 | 李长春 | Workpiece concentric clamping device and clamping method |
| CN111390213A (en) * | 2020-04-16 | 2020-07-10 | 胡炜凯 | Numerical control machine tool chuck mechanism with workpiece capable of being popped out quickly |
| CN111390213B (en) * | 2020-04-16 | 2021-03-26 | 嘉兴华嶺机电设备有限公司 | Numerical control machine tool chuck mechanism with workpiece capable of being popped out quickly |
| CN111912321A (en) * | 2020-09-14 | 2020-11-10 | 青岛约克运输设备有限公司 | Inner hole coaxiality gauge |
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| CN116638112B (en) * | 2023-06-02 | 2024-03-12 | 荣成荣盛橡胶机械有限公司 | Continuous processing feeding device of locking upright post for tire vulcanizer |
| CN117644217A (en) * | 2024-01-29 | 2024-03-05 | 山东豪迈精密机械有限公司 | Digit control machine tool clamping device and digit control machine tool |
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| Publication number | Publication date |
|---|---|
| CN101224504B (en) | 2010-06-02 |
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Assignee: Xuzhou Huaheng Robot System Co., Ltd. Assignor: Kunshan Huaheng Engineering Technology Center Co., Ltd. Contract record no.: 2011320000537 Denomination of invention: Self-centering chuck Granted publication date: 20100602 License type: Exclusive License Open date: 20080723 Record date: 20110408 |