CN103831770A - Interior-angle screw bit tool - Google Patents
Interior-angle screw bit tool Download PDFInfo
- Publication number
- CN103831770A CN103831770A CN201210495217.5A CN201210495217A CN103831770A CN 103831770 A CN103831770 A CN 103831770A CN 201210495217 A CN201210495217 A CN 201210495217A CN 103831770 A CN103831770 A CN 103831770A
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- CN
- China
- Prior art keywords
- resettlement section
- interior angle
- angle screw
- joint pin
- sleeve
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
- B25B23/0064—Means for adjusting screwing depth
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Reinforcement Elements For Buildings (AREA)
Abstract
An interior-angle screw bit tool comprises a sleeve, a connecting column and a limiting piece. The sleeve is a hollow cylinder and comprises a first storage portion and a second storage portion. A limiting hole is formed in the lateral wall of the first storage portion. The second storage portion and the first storage portion are fixedly connected and mutually communicated, and the axis of the second storage portion and the axis of the first storage portion coincide. The cross section of the connecting column is matched with the cross section of a groove of a nut of an interior-angle screw. The two ends of the connecting column are stored in the first storage portion and the second storage portion respectively, and the connecting column can slide relative to the sleeve and is used for being connected with the interior-angle screw. The limiting piece is arranged in the limiting hole in a penetrating mode, and one end of the limiting piece is in butt joint with the lateral wall of the connecting column so as to limit the connecting column. The length of the part, located in the first storage portion, of the connecting column can be adjusted, and therefore the installation depth of the interior-angle screw to be installed can also be adjusted correspondingly. Thus, the interior-angle screw bit tool can meet different assembly requirements, and therefore the product quality is improved and guaranteed.
Description
Technical field
The present invention relates to screwdriver bit frock, particularly relate to a kind of interior angle screw screwdriver bit frock.
Background technology
Along with the growth requirement of light trade, in the structure for a large amount of light fixture products, need to use interior angle screw to connect at present.The assembling of interior angle screw is at present generally electric screwdriver and coordinates with screwdriver bit, to complete the assembling of interior angle screw.But because screwdriver bit belongs to standard workpiece, cannot regulate for himself aperture and the degree of depth.In the time that the degree of depth that requires to assemble for different interior angle screws is inconsistent, use traditional screwdriver bit to be difficult to meet the requirement of different assembly technologies.In installation process, if the degree of depth that interior angle screw to be installed is installed is greater than or less than the fitting depth that this screw requires, all will directly affect the reliability that light fixture product connects, affect the quality of product.
Summary of the invention
Based on this, be necessary to provide a kind of interior angle screw screwdriver bit frock of the fitting depth that can regulate interior angle screw to be installed.
A kind of interior angle screw screwdriver bit frock, comprising:
Sleeve, is hollow form cylinder, and described sleeve comprises:
The first resettlement section, is hollow form cylinder, on the sidewall of described the first resettlement section, offers spacing hole, and described the first resettlement section is used for accommodating described interior angle screw;
The second resettlement section, is hollow form cylinder, is fixedly connected with and is conducted with described the first resettlement section, and the dead in line of described the second resettlement section and described the first resettlement section, described the second resettlement section is for being fixedly connected with electric screwdriver;
Joint pin, the cross section of the groove of the nut of its cross section and described interior angle screw matches, described joint pin two ends are contained in respectively in described the first resettlement section and described the second resettlement section, and with respect to described sleeve slidably, described joint pin is for being connected with interior angle screw;
Locating part, is arranged in described spacing hole, and one end of described locating part and the sidewall of described joint pin connect, with spacing described joint pin;
Wherein, in described joint pin is contained in described groove time, described electric screwdriver drives described sleeve to rotate, and described joint pin drives described interior angle screw turns.
In an embodiment, the lateral wall of described the second resettlement section is provided with positive stop lug boss therein, and described positive stop lug boss makes described the second resettlement section and described electric screwdriver clamping.
Therein in an embodiment, the bore of described the first resettlement section is greater than the bore of described the second resettlement section, described the first resettlement section is shunk and is formed step sidewall towards its axis near the sidewall of one end of described the second resettlement section, and described step sidewall forms a through hole, one end of described joint pin, through described through hole, is contained in described the second resettlement section.
In an embodiment, the length of described joint pin is greater than the distance between described spacing hole and described step sidewall therein.
In an embodiment, the shape of described through hole and the cross section of described joint pin match therein.
In an embodiment, described interior angle screw is soket head cap screw therein, and the rank street face of described joint pin is regular hexagon, described through hole be shaped as regular hexagon.
In an embodiment, described spacing hole is tapped through hole therein, and described locating part is trip bolt.
In an embodiment, the length of described joint pin is greater than the length of described the first resettlement section therein, and is less than the length of described sleeve.
In an embodiment, also comprise joint therein, described fitting sleeve is located in one end away from described the first resettlement section, described the second resettlement section, and is fixedly connected with described the second resettlement section, and described joint is for being fixedly connected with described electric screwdriver.
In an embodiment, described the first resettlement section is provided with scuff-resistant coating away from the end wall of one end of described the second resettlement section therein.
Compared with the screwdriver bit frock of the screwdriver bit frock of above-mentioned interior angle screw and traditional interior angle screw, at least have the following advantages:
First, interior angle screw is contained in the first resettlement section of sleeve, and joint pin is contained in the groove of nut of interior angle screw, and joint pin rotates and drives interior angle screw turns, to play the object of assembling interior angle screw.Because interior angle screw to be installed is contained in the first resettlement section, the effect of spacing interior angle screw to be installed can be played in the first resettlement section, guarantees that interior angle screw to be installed can vertically squeeze into mounting plane.And in electric screwdriver rotation process, there is not dancing in interior angle screw to be installed.
Secondly, joint pin in sleeve slidably, and joint pin two ends are contained in respectively in the first resettlement section and the second resettlement section, one end that joint pin is positioned at the first resettlement section is contained in the groove of interior angle screw, and locating part can spacing joint pin, makes joint pin be positioned at the adjustable in length of the first resettlement section.The fitting depth that interior angle screw to be installed requires is the port of the first resettlement section and the distance of joint pin one end.Therefore,, in the time regulating joint pin to be positioned at the length of the first resettlement section, the fitting depth of interior angle screw to be installed is also corresponding adjusted.Therefore, above-mentioned interior angle screw screwdriver bit frock can regulate the fitting depth of interior angle screw to be installed, to meet different matching requirements, and then the quality of raising product, guarantee product quality.
And the end wall of the first resettlement section is provided with scuff-resistant coating.Scuff-resistant coating can prevent that the end wall of the first resettlement section and mounting plane from rubbing, and prevents that the end wall of the first resettlement section from damaging the painted surface of mounting plane, affects the quality of the attractive in appearance and product of product.
Accompanying drawing explanation
Fig. 1 is the perspective view of the interior angle screw screwdriver bit frock of an embodiment;
Fig. 2 is the perspective view of another angle of interior angle screw screwdriver bit frock shown in Fig. 1;
Fig. 3 is the left view of the interior angle screw screwdriver bit frock shown in Fig. 1;
Fig. 4 is the front view of the interior angle screw screwdriver bit frock shown in Fig. 1.
The specific embodiment
For the ease of understanding the present invention, below with reference to relevant drawings, the present invention is described more fully.In accompanying drawing, provide preferred embodiments of the present invention.But the present invention can realize in many different forms, be not limited to embodiment described herein.On the contrary, providing the object of these embodiments is make the disclosure of the present invention understand more comprehensively thorough.
It should be noted that, when element is called as " being fixed on " another element, it can be directly on another element or also can have an element placed in the middle.When an element is considered to " connection " another element, it can be directly connected to another element or may have centering elements simultaneously.Term as used herein " vertical ", " level ", " left side ", " right side " and similar statement just for illustrative purposes, do not represent it is unique embodiment.
Unless otherwise defined, all technology that use are herein identical with the implication that belongs to the common understanding of those skilled in the art of the present invention with scientific terminology.The term using in description of the present invention herein, just in order to describe the object of concrete embodiment, is not intended to be restriction the present invention.Term as used herein " and/or " comprise one or more relevant Listed Items arbitrarily with all combinations.
Refer to Fig. 1, the interior angle screw screwdriver bit frock 100 of present embodiment is for being assembled to various light fixtures by interior angle screw.For convenience of understanding, describe as an example of soket head cap screw example at this interior angle screw.Be appreciated that interior angle screw can also be cruciform slot screw, slotted head screw etc.Interior angle screw screwdriver bit frock 100 comprises sleeve 110, joint pin 120, locating part 130 and joint 140.Joint pin 120 accommodate with sleeve 110 in, and be fixedly connected with sleeve 110 by locating part 130.Sleeve 110 is connected with electric screwdriver (not shown) by joint 140.
Refer to Fig. 2 and Fig. 3, the first resettlement section 111 is hollow form cylinder.On the sidewall of the first resettlement section 111, offer spacing hole (figure is mark not), the first resettlement section 111 is for accommodating interior angle screw (not shown) to be installed.Specifically in the present embodiment, one end of the first resettlement section 111 is openend, and the other end is provided with step sidewall 111a.The sidewall of one end of the first resettlement section 111 shrinks and forms step sidewall 111a towards axis, and step sidewall 111a forms a through hole 111c.The shape of through hole 111c is consistent with the cross section of the groove of the nut of interior angle screw to be installed.The bore of the first resettlement section 111 equals the diameter of interior angle screw, so that the madial wall of the sidewall of interior angle screw and the first resettlement section 111 connects, therefore the first resettlement section 111 can spacing interior angle screw to be installed.In the process of assembling, guarantee that interior angle screw and fitting plane are perpendicular, prevent that interior angle screw from shaking.
Scuff-resistant coating 112 is located on the end wall of the first resettlement section 111.In the time that the first resettlement section 111 moves to mounting plane (not shown), end wall and the mounting plane of the openend of the first resettlement section 111 connect, and can rub between the first resettlement section 111 and mounting plane.The end wall of the first resettlement section 111 can damage mounting plane, and the skin of paint on abraded product surface destroys the attractive in appearance of product, affects the anticorrosive property of product.Specifically in the present embodiment, scuff-resistant coating 112 is nylon ring.
Be appreciated that in other embodiments, scuff-resistant coating 112 can also be rubber ring or resin circle.
The second resettlement section 113 is hollow form cylinder.The second resettlement section 113 is fixedly connected with and is conducted with the first resettlement section 111.Specifically in the present embodiment, sleeve 110 is formed in one.Be appreciated that the first resettlement section 111 and the second resettlement section 113 can also be fixedly connected with by welding or the mode such as bonding.The dead in line of the second resettlement section 113 and the first resettlement section 111, the second resettlement section 113 is for being fixedly connected with electric screwdriver.In the time that electric screwdriver drives the second resettlement section 113 to rotate, due to the first resettlement section 111 and the second resettlement section 113 coaxial, the rotation of same frequency is done in the first resettlement section 111 and the second resettlement section 113.And eccentric rotary, stability of rotation can not done in the first resettlement section 111.Specifically in the present embodiment, the bore of the first resettlement section 111 is greater than the bore of the second resettlement section 113.The second resettlement section 113 is connected with step sidewall 111a, and the opening of the first resettlement section 111 and through hole 111c are conducted.
Be appreciated that in other embodiments, the bore of the first resettlement section 111 can be less than the bore of the second resettlement section 113.
Refer to Fig. 4, positive stop lug boss 115 is located on the lateral wall of the second resettlement section 113.Positive stop lug boss 115 makes the second resettlement section 113 and electric screwdriver clamping.Specifically in the present embodiment, positive stop lug boss 115 is two, is relatively located on the lateral wall of the second resettlement section 113.Electric screwdriver is provided with elasticity draw-in groove (not shown), in the time that electric screwdriver is connected with the second resettlement section 113, positive stop lug boss 115 is held in elasticity draw-in groove.Guarantee the second resettlement section 113 and electric screwdriver clamping, in the process that prevents from rotating at electric screwdriver, the second resettlement section 113 comes off with electric screwdriver, guarantees that electric screwdriver can be stablized with the second resettlement section 113 to be connected.
Specifically in the present embodiment, one end of joint pin 120 is contained in the first resettlement section 111, and the other end is contained in the second resettlement section 113 through the through hole 111c of step sidewall 111a.Interior angle screw is soket head cap screw, and the rank street face of joint pin 120 is regular hexagon, and through hole 111c is shaped as regular hexagon.Joint pin 120 is contained in through hole 111c, and the sidewall of the sidewall of joint pin 120 and through hole 111c connects, and prevents that joint pin 120 from rotating with respect to the first resettlement section 111.
Be appreciated that in the time that interior angle screw is cruciform slot screw or slotted head screw, the rank street face of joint pin 120 is also cross or in-line accordingly, and through hole 111c is cross bore or a word hole.The through hole 111c post 120 that is located by connecting, when sleeve 110 is rotated, can drive joint pin 120 to rotate.
The length of joint pin 120 is greater than the distance between spacing hole and step sidewall 111a., when joint pin 120 is between spacing hole and through hole 111c, can guarantee that one end of joint pin 120 can be contained in the groove of interior angle screw to be installed, guarantee that joint pin 120 can be connected with interior angle screw to be installed.
And the length of joint pin 120 is greater than the length of the first resettlement section 111, the length of joint pin 120 is less than the length of sleeve 110.Because the length of joint pin 120 is greater than the length of the first resettlement section 111,, in the case of guaranteeing that one end of joint pin 120 can be connected with the groove of interior angle screw, the other end of joint pin 120 is contained in the second resettlement section 113 by through hole 111c.So that joint pin 120 can be fixedly connected with sleeve 110, in the time that sleeve 110 rotates, thereby drive joint pin 120 to rotate.
Locating part 130 is arranged in spacing hole, and the sidewall of one end of locating part 130 and joint pin 120 connects, with spacing joint pin 120.Because locating part 130 and the sidewall of joint pin 120 connect, the length that can make joint pin 120 be positioned at the first resettlement section 111 is fixed, and prevents that joint pin 120 from sliding between the first resettlement section 111 and the second resettlement section 113.Specifically in the present embodiment, spacing hole is tapped through hole 111c, and locating part 130 is trip bolt.In regulating the fitting depth of interior angle screw, rotary stopper part 130, departs from locating part 130 and the sidewall of joint pin 120, and joint pin 120 can slide with respect to sleeve 110, regulates joint pin 120 to be positioned at the length of the first resettlement section 111.In the time that the length of joint pin 120 meets installation requirement, screw locating part 130, post 120 is located by connecting.In the process of installation interior angle screw, locating part 130 connects with the sidewall of joint pin 120, prevents that joint pin 120 from sliding, and the length that makes joint pin 120 be positioned at the first resettlement section 111 changes.
Spacing hole can be multiple, and correspondingly locating part 130 is also multiple, and multiple spacing hole is positioned on same circumference, and each spacing hole equates apart from the distance of step sidewall 111a.Multiple locating parts 130 can connect with several sidewalls of joint pin 120 respectively, so that joint pin 120 is spacing better, prevent because pressure is excessive, and joint pin 120 is moved.
Be appreciated that in other embodiments, locating part 130 can also be elastic button or magnetic part.As long as can make connecting of locating part 130 and joint pin 120, make joint pin 120 can positioning instant can.
Joint 140 is sheathed in second one end away from the first resettlement section 111, resettlement section 113, and is fixedly connected with the second resettlement section 113.The second resettlement section 113 can be realized and being connected by joint 140 with electric screwdriver.Joint 140 is contained in one end of the second resettlement section 113, and by the opening sealing of the second resettlement section 113.Joint 140 can prevent that joint pin 120 from stretching out from the opening part of the second resettlement section 113, prevents that joint pin 120 from affecting being fixedly connected with of the second resettlement section 113 and electric screwdriver.
In above-mentioned interior angle screw screwdriver bit frock 100, due to joint pin 120 in sleeve 110 slidably, and joint pin 120 two ends are contained in respectively in the first resettlement section 111 and the second resettlement section 113, one end that joint pin 120 is positioned at the first resettlement section 111 is contained in the groove of interior angle screw.And locating part 130 can spacing joint pin 120, regulate joint pin 120 to be positioned at after the length of the first resettlement section 111, be fixedly connected with post 120 by locating part 130.After electric screwdriver is connected with the second resettlement section 113, the second resettlement section 113 drives the first resettlement section 111 to rotate, and the first resettlement section 111 is rotated and driven joint pin 120 to rotate, and joint pin 120 drives interior angle screw turns.In the time that the end wall of the openend of mounting plane and the first resettlement section 111 connects, electric screwdriver stops operating, and interior angle screw to be installed is arranged on mounting plane.
Therefore, the desired fitting depth of interior angle screw is that the openend of the first resettlement section 111 and joint pin 120 are near the distance between one end of openend.In the time regulating joint pin 120 to be positioned at the length of the first resettlement section 111, the fitting depth of interior angle screw to be installed is also corresponding adjusted.Therefore, above-mentioned interior angle screw screwdriver bit frock 100 can regulate the fitting depth of interior angle screw to be installed, to meet the different matching requirements of interior angle screw, and then the quality of raising product, guarantee product quality.
The above embodiment has only been expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. an interior angle screw screwdriver bit frock, is characterized in that, comprising:
Sleeve, is hollow form cylinder, and described sleeve comprises:
The first resettlement section, is hollow form cylinder, on the sidewall of described the first resettlement section, offers spacing hole, and described the first resettlement section is used for accommodating described interior angle screw;
The second resettlement section, is hollow form cylinder, is fixedly connected with and is conducted with described the first resettlement section, and the dead in line of described the second resettlement section and described the first resettlement section, described the second resettlement section is for being fixedly connected with electric screwdriver;
Joint pin, the cross section of the groove of the nut of its cross section and described interior angle screw matches, described joint pin two ends are contained in respectively in described the first resettlement section and described the second resettlement section, and with respect to described sleeve slidably, described joint pin is for being connected with described interior angle screw;
Locating part, is arranged in described spacing hole, and one end of described locating part and the sidewall of described joint pin connect, with spacing described joint pin;
Wherein, in described joint pin is contained in described groove time, described electric screwdriver drives described sleeve to rotate, and described joint pin drives described interior angle screw turns.
2. interior angle screw screwdriver bit frock according to claim 1, is characterized in that, the lateral wall of described the second resettlement section is provided with positive stop lug boss, and described positive stop lug boss makes described the second resettlement section and described electric screwdriver clamping.
3. interior angle screw screwdriver bit frock according to claim 1, it is characterized in that, the bore of described the first resettlement section is greater than the bore of described the second resettlement section, described the first resettlement section is shunk and is formed step sidewall towards its axis near the sidewall of one end of described the second resettlement section, and described step sidewall forms a through hole, one end of described joint pin, through described through hole, is contained in described the second resettlement section.
4. interior angle screw screwdriver bit frock according to claim 3, is characterized in that, the length of described joint pin is greater than the distance between described spacing hole and described step sidewall.
5. interior angle screw screwdriver bit frock according to claim 3, is characterized in that, the shape of described through hole and the cross section of described joint pin match.
6. interior angle screw screwdriver bit frock according to claim 5, is characterized in that, described interior angle screw is soket head cap screw, and the rank street face of described joint pin is regular hexagon, described through hole be shaped as regular hexagon.
7. interior angle screw screwdriver bit frock according to claim 1, is characterized in that, described spacing hole is tapped through hole, and described locating part is trip bolt.
8. interior angle screw screwdriver bit frock according to claim 1, is characterized in that, the length of described joint pin is greater than the length of described the first resettlement section, and is less than the length of described sleeve.
9. interior angle screw screwdriver bit frock according to claim 1, it is characterized in that, also comprise joint, described fitting sleeve is located in one end away from described the first resettlement section, described the second resettlement section, and be fixedly connected with described the second resettlement section, described joint is for being fixedly connected with described electric screwdriver.
10. interior angle spiral shell screwdriver bit frock according to claim 1, is characterized in that, described the first resettlement section is provided with scuff-resistant coating away from the end wall of one end of described the second resettlement section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210495217.5A CN103831770A (en) | 2012-11-27 | 2012-11-27 | Interior-angle screw bit tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210495217.5A CN103831770A (en) | 2012-11-27 | 2012-11-27 | Interior-angle screw bit tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103831770A true CN103831770A (en) | 2014-06-04 |
Family
ID=50795830
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210495217.5A Pending CN103831770A (en) | 2012-11-27 | 2012-11-27 | Interior-angle screw bit tool |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103831770A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106695308A (en) * | 2015-08-25 | 2017-05-24 | 常州兰翔机械有限责任公司 | Assembly fixture for double-end stud, and working method thereof |
| CN110125856A (en) * | 2019-05-31 | 2019-08-16 | 江苏酉立智能装备有限公司 | A kind of adjustable sleeve head |
| CN113356552A (en) * | 2021-06-29 | 2021-09-07 | 中铁八局集团第一工程有限公司 | Construction method based on adjustable pull rod cantilever frame |
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| EP0516295A1 (en) * | 1991-05-31 | 1992-12-02 | Emhart Inc. | Masonry anchor installation tool |
| US6138538A (en) * | 1997-03-31 | 2000-10-31 | Neijndorff; Eduard | Finish-protective tool pieces and finish-protective collars |
| CA2315992A1 (en) * | 1999-08-13 | 2001-02-13 | Maxtech Manufacturing Inc. | A device for holding a tool bit and selectively transmitting or releasing torque between a torque generating means and the tool bit |
| CN201439190U (en) * | 2009-08-11 | 2010-04-21 | 东风汽车股份有限公司 | Magnetic sleeve head |
| DE202010010009U1 (en) * | 2010-07-08 | 2010-10-14 | Compass Corporation | Assembly for screwing |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4296656A (en) * | 1980-04-21 | 1981-10-27 | Illinois Tool Works Inc. | Driver bit attachment |
| EP0516295A1 (en) * | 1991-05-31 | 1992-12-02 | Emhart Inc. | Masonry anchor installation tool |
| US6138538A (en) * | 1997-03-31 | 2000-10-31 | Neijndorff; Eduard | Finish-protective tool pieces and finish-protective collars |
| CA2315992A1 (en) * | 1999-08-13 | 2001-02-13 | Maxtech Manufacturing Inc. | A device for holding a tool bit and selectively transmitting or releasing torque between a torque generating means and the tool bit |
| CN201439190U (en) * | 2009-08-11 | 2010-04-21 | 东风汽车股份有限公司 | Magnetic sleeve head |
| DE202010010009U1 (en) * | 2010-07-08 | 2010-10-14 | Compass Corporation | Assembly for screwing |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106695308A (en) * | 2015-08-25 | 2017-05-24 | 常州兰翔机械有限责任公司 | Assembly fixture for double-end stud, and working method thereof |
| CN106695308B (en) * | 2015-08-25 | 2019-01-22 | 中国航发常州兰翔机械有限责任公司 | A kind of studs assembling jig and its working method |
| CN110125856A (en) * | 2019-05-31 | 2019-08-16 | 江苏酉立智能装备有限公司 | A kind of adjustable sleeve head |
| CN113356552A (en) * | 2021-06-29 | 2021-09-07 | 中铁八局集团第一工程有限公司 | Construction method based on adjustable pull rod cantilever frame |
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Application publication date: 20140604 |