CN105952742A - Mounting adapter for split nested unilateral bolt fastener - Google Patents

Mounting adapter for split nested unilateral bolt fastener Download PDF

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Publication number
CN105952742A
CN105952742A CN201610322245.5A CN201610322245A CN105952742A CN 105952742 A CN105952742 A CN 105952742A CN 201610322245 A CN201610322245 A CN 201610322245A CN 105952742 A CN105952742 A CN 105952742A
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CN
China
Prior art keywords
shell
outer sleeve
inner sleeve
bolt
adaptor
Prior art date
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Granted
Application number
CN201610322245.5A
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Chinese (zh)
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CN105952742B (en
Inventor
简小刚
黄卓
甘熠华
王伟
陈以
陈以一
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Tongji University
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Tongji University
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Priority to CN201610322245.5A priority Critical patent/CN105952742B/en
Publication of CN105952742A publication Critical patent/CN105952742A/en
Application granted granted Critical
Publication of CN105952742B publication Critical patent/CN105952742B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16BDEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B7/00Connections of rods or tubes, e.g. of non-circular section, mutually, including resilient connections

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)

Abstract

The invention relates to a mounting adapter for a split nested unilateral bolt fastener. The mounting adapter comprises a main body, an inner sleeve (5) fixed on the main body and an outer sleeve (6) arranged outside the inner sleeve (5) in a sleeving manner, wherein the inner sleeve (5) is used for accommodating and fixing a bolt (9); the outer sleeve (6) is connected with a rotation output shaft of a driving mechanism and used for accommodating and driving a nut (11) to rotate; an inner gear is arranged on the inner wall of the outer sleeve (6) and used for being meshed with an outer gear (8) on the rotation output shaft of the driving mechanism; the main body comprises a cylindrical housing (2) arranged outside the outer sleeve (6) in a sleeving manner; hinge pin holes (31) are formed in the cylinder body of the housing (2); circular-arc-shaped holes (32) are formed in the cylinder body of the outer sleeve (6); and hinge pins (3) are fixedly mounted on the outer wall of the inner sleeve (5) and penetrate the corresponding circular-arc-shaped holes (32) and hinge pin holes (31). Compared with the prior art, the mounting adapter has the advantages of small space occupation and high reliability.

Description

A kind of split Nested-type single-side bolt fastener installs adaptor
Technical field
The present invention relates to a kind of unilateral bolt fastener auxiliary mounting tool, especially relate to a kind of split nested type Unilateral bolt fastener installs adaptor.
Background technology
Current in civil construction and mechanical erection field, the installation requirements amount that structural member connects fastening is big.Just For the bolt commonly used at present, when implementing to connect terminal operation to component, staff needs simultaneously at structure The operation of part both sides, is still the best implementation method for monolateral mounting means.This method for fastening connection structure It is simple and convenient to operate, carries, but be only applicable in opening section component, in some special occasions, such as To closed cross-section member or inconvenience when the component that other side operates is attached fastening, just cannot use this Conventional bolt and nut method for fastening connection.And on domestic market, there is no corresponding monolateral bolt product, public The Patents opened or weaken shank of bolt too much or bolt head stress point is very few, foreign market has been similar to product Product, but above-mentioned existing patent or product are all difficult to, at erection stage, bolt is applied bigger pretension to form friction Type bolt joint, the comprehensive mechanical property of its carrying is unsatisfactory, is subject in Anti-quake Architectural Structure Design is applied To considerable restraint.
Applicant has obtained a kind of split Nested-type single-side bolt fastener of mandate national inventing patent, and (grant number is 103671447B), this patent can realize unilateral operation, the connection completing structural member and fastening.General installation side In formula, directly electric wrench sleeve is connected with nut, it is impossible to ensure that bolt does not rotates.When bolt occurs to turn Time dynamic, the frictional force existed between bolt and split type pad can cause split type pad generation sliding to rotate, it is impossible to Several pieces of pads are made to be uniformly distributed and make unbalance stress.Contact friction force when between pad and connector is not enough simultaneously Time, bolts and nuts are easy to rotate together, it is impossible to the torque value reaching to set completes installment work.
It is electronic that the patent of Application No. 2015108219651 discloses a kind of split Nested-type single-side bolt fastener Installation tool, is used for installing split Nested-type single-side bolt fastener, and this instrument includes main body and is arranged in main body Input mechanism and output mechanism, described output mechanism includes output shaft inner sleeve and is set in its outside output Outer shaft sleeve cylinder, described output shaft outer sleeve outer wall is provided with and engages, with input mechanism, the first gear being connected, described Output shaft inner sleeve is fixed in main body, and during installation, output shaft outer sleeve is connected with nut, output shaft inner sleeve with Bolt connects, and input mechanism rotation is also rotated by the first gear driven output shaft outer sleeve, makes output shaft inner sleeve Produce relative rotation with output shaft outer sleeve, so that screw bolt and nut relatively rotates.
But the output shaft outer sleeve of this instrument is the gear by outer wall engages with input mechanism, this structure takies sky Between big;Fixing reliability between output shaft inner sleeve and main body is the highest.
It is thus desirable to a kind of suitably adaptor, it is possible to realize fixing during installing bolt motionless while twist Jack panel.
Summary of the invention
Defect that the purpose of the present invention is contemplated to overcome above-mentioned prior art to exist and provide one effectively to keep Bolt is fixed, take up room little, the split Nested-type single-side bolt fastener mounting head of strong adaptability, simple in construction.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of split Nested-type single-side bolt fastener installs adaptor, is used for installing the monolateral bolt of split nested type tight Firmware, described bolt fastener includes bolt, nut and split type pad, and described adaptor includes that position is solid Fixed main body, the inner sleeve being fixed in main body and be set in the outer sleeve outside inner sleeve, described inner sleeve is used In accommodating and fixing bolt, described outer sleeve is connected with the rotary output axis of drive mechanism, is used for accommodating nut also Drive nut rotation,
It is characterized in that, described outer sleeve inwall is provided with internal gear, and described internal gear is used for and drive mechanism External gear engagement on rotary output axis, makes drive mechanism coaxially connected with outer sleeve, and described main body includes shell, Described shell is tubular, and casing is located at outside outer sleeve, and the cylinder of shell is provided with multiple pin shaft hole, described The cylinder of outer sleeve be provided with multiple circular hole, described inner sleeve outer wall fixedly mounts multiple bearing pins, described Bearing pin is through corresponding circular hole and pin shaft hole, and during use, drive mechanism drives outer sleeve and nut rotation, circular arc Hole has along the circumferentially extending length of outer sleeve, is used for avoiding outer sleeve to collide with bearing pin, bearing pin and pin shaft hole diameter Coupling, makes inner sleeve and bolt position fix.
The quantity of described pin shaft hole, circular hole and bearing pin is 3.
Between each pin shaft hole and pin shaft hole, between circular hole and circular hole and between bearing pin and bearing pin the most uniformly Distribution.
Described inner sleeve outer wall is provided with screwed hole, and inner sleeve is connected with described pin shaft thread.
Described main body also includes the rear end cap being arranged on shell one end, and described rear end cap is fixing with shell to be connected, The end face of rear end cap is provided with polygon receiving hole, for accommodating the polygon of the drive mechanism i.e. outfan of electric wrench The shaft shoulder, described electric wrench is fixed by counter-force arm holding position, prevents shell from rotating.
Described rear end cap is threaded connection with shell that part is fixing to be connected.
Described screw bolt and nut is positioned at the front end of shell, and described rear end cap is positioned at the rear end of shell.
The front end of described shell is provided with drive end bearing bracket, and it is fixing even that described drive end bearing bracket and shell are threaded connection part Connect, bottom drive end bearing bracket, be provided with counter-force arm, during use, on the most mounted bolt of counter-force arm card, by moment With output shaft equalising torque.
Described drive mechanism is electric wrench.
Described output shaft outer sleeve one end is provided with the nut mated with nut shape and accommodates chamber, output shaft inner sleeve one End is provided with the bolt head with bolt tail form fit and accommodates chamber.
Compared with prior art, the invention have the advantages that
(1) drive mechanism is engaged by internal-external gear with outer sleeve, coaxially connected guarantee outer sleeve smooth rotation, Can indirectly drive nut rotation, and bolt is fixed by the output shaft inner sleeve in export structure, so that nut Relatively rotate with bolt, complete to install, prevent the split type pad of bolt fastener from sliding and producing unbalance stress Phenomenon, prevents nuts and bolt from skidding together rotation simultaneously, it is ensured that installation reliability and mechanical property good after installing Energy;This structure takes up room little, it is possible to use in the narrowest and small working place, is installed at electronic pulling with traditional Sleeve on hand compares, it is also possible to realizes the monolateral installation of bolt, fixes bolt motionless simultaneously, coordinates to install and divides Body Nested-type single-side bolt fastener.
(2) inner sleeve is connected with shell by bearing pin, makes inner sleeve position fix, prevents inner sleeve with outer sleeve Rotate;Multiple bearing pins share the frictional force that outer sleeve brings to inner sleeve, improve reliability.
(3) length of circular hole is circumferentially extending along outer sleeve, it is ensured that output shaft outer sleeve turns with less angle Time dynamic, output shaft inner sleeve can be fixed on shell.
(4) quantity of pin shaft hole, circular hole and bearing pin is 3, takes into account reliability and manufacturing cost.
(5) between each pin shaft hole and pin shaft hole, between circular hole and circular hole and between bearing pin and bearing pin etc. Away from being uniformly distributed, it is ensured that shell is uniform stressed under moment of torsion effect.
(6) inner sleeve is connected with pin shaft thread, conveniently dismantles and is replaced bearing pin.
(7) end face of the rear end cap of main body is provided with polygon receiving hole, is used for accommodating polygon fixture, prevents Shell rotates, simple in construction, it is easy to dismantle and transform.
(8) rear end cap is threaded connection with shell that part is fixing to be connected, convenient is replaced rear end cap, to fit Answer different fixture shapes.
(9) using traditional electric wrench to need to install counter-force arm additional to be used together, structure is complex loaded down with trivial details, this Adaptor installed counter-force arm structure additional, the design with adaptor is integrated.More convenient to use, simultaneously The balance of moment can be realized as traditional counter-force arm, make the operator will not in the case of fastening nut Feel counter-force effect.
(10) adaptor one end connecting electric wrench, one end connecting bolt securing member, shell is wrapped in output simultaneously Outside mechanism, make whole tool exterior integration, prevent output mechanism by collision deformation, output shaft drive end bearing bracket simultaneously Being provided with counter-force arm, beneficially instrument location, increases operation convenience.
Accompanying drawing explanation
Fig. 1 is the perspective view of the embodiment of the present invention;
Fig. 2 is embodiment of the present invention cross-sectional view;
Fig. 3 is the three dimensional structure schematic diagram that the embodiment of the present invention eliminates shell;
Fig. 4 is the structural representation that the embodiment of the present invention eliminates shell and outer sleeve;
Fig. 5 is the backsight structural representation of the embodiment of the present invention;
Fig. 6 is the operating process schematic diagram of the embodiment of the present invention;
Fig. 7 is the unilateral bolt fastener schematic diagram after the installation of the embodiment of the present invention terminates;
Reference:
1 is electric wrench;2 is shell;3 is bearing pin;31 is pin shaft hole;32 is circular hole;4 is drive end bearing bracket; 5 is inner sleeve;6 is outer sleeve;7 is rear end cap;8 is external gear;9 is bolt;10 is split type pad; 11 is nut;12 is counter-force arm.
Detailed description of the invention
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is with the technology of the present invention side Implement premised on case, give detailed embodiment and concrete operating process, but the protection model of the present invention Enclose and be not limited to following embodiment.
Embodiment
As shown in Fig. 1~5, a kind of split Nested-type single-side bolt fastener installs adaptor, is used for assisting installation point Body Nested-type single-side bolt fastener, as it is shown in fig. 7, bolt fastener includes bolt 9, nut 11 and split Formula pad 10, adaptor mainly includes main body and the output mechanism being arranged in main body, and output mechanism includes inner sleeve Cylinder 5 and the outer sleeve 6 being set in its outside, shell 2, in tubular, is set in outer sleeve 6 outside, shell 2 Cylinder is provided with multiple pin shaft hole 31, and inner sleeve 5 is fixed on main body cover 2 by 3 bearing pins 3, overcoat Cylinder 6 is connected with nut 11, and inner sleeve 6 is connected with bolt 9.Outer sleeve 6 one end processes internal gear, with outward Gear 8 engages each other transmission, and outer sleeve 6 other end is provided with interior hexagonal nut and accommodates chamber, joins with nut 11 Close.The gap circular holes 32 such as three sections are had, in order to for being fixed on shell 2 when outer sleeve rotates in the middle part of outer sleeve 6 Bearing pin 3 headspace.During transmission, the power of electric wrench 1 passes through gear drive to outer sleeve 6, inner sleeve 5 fix bolt 9, make bolt 9 and nut 11 relatively rotate, and complete to install.Compared with prior art, the present invention There is reliability height, strong adaptability, the advantage of simple in construction.
Outer sleeve 6 one end is provided with the nut with nut 11 form fit and accommodates chamber, and inner sleeve 5 one sections is provided with and spiral shell The bolt head of bolt 9 tail shape coupling accommodates chamber.
Inner sleeve 5 is connected with bolt 9, and inner sleeve 5 is axially solid by the way of three bearing pins 3 are with threaded engagement It is scheduled on shell 2.Outer sleeve 6 one end is provided with the travelling gear 8 that internal gear exports with power and matches, the other end Being connected with nut 11, stage casing is provided with the circular hole of three sections of equidistant arrangements, it is ensured that outer sleeve 6 is with less angle When degree rotates, inner sleeve 5 can be fixed on shell 2.
Adaptor can realize the self-balancing of device when mounted.Counter-force arm 12 it is provided with bottom output shaft drive end bearing bracket 4, In fastening nut operation, counter-force arm 12 is blocked and is the most installed on bolt, by moment and output shaft equalising torque. Inner sleeve 5 is fixed on shell 2 simultaneously, it is ensured that coupled bolt 9 axial restraint.
Output shaft rear end closure 7 is provided with the polygon receiving hole cooperated with electric wrench 1 head, it is ensured that electronic Spanner 1 and adaptor axial restraint, realize the most flat of device by output shaft drive end bearing bracket 4 counter-force arm 12 together Weighing apparatus so that operator do not feel as the effect of counter-force.The polygon of polygon receiving hole can be hexagon, four Limit shape, triangle etc., the present embodiment is hexagon.
Inner sleeve 5 afterbody is provided with three screwed holes, in order to be connected with each other with three bearing pins 3.Between three bearing pin 3 grades Away from symmetrical, it is ensured that shell 2 is uniform stressed under moment of torsion effect.
As shown in Figure 6, the present embodiment is used to carry out split Nested-type single-side bolt fastener installation process as follows:
The output shaft rear end closure 7 of 1, split Nested-type single-side bolt fastener adaptor is connected with electric wrench 1, Outer sleeve 6 is connected with nut 11, and inner sleeve 5 is connected with bolt 9.The counter-force arm 12 of output shaft drive end bearing bracket 4 It is stuck on the most mounted adjacent bolt fastener;
2, before installing, the active force that manually applying is certain is on electric wrench 1 and adaptor, and this power is along bolt 9 Axis direction applies.Inner sleeve 5 and outer sleeve 6 are against on bolt 9 and nut 11 respectively.Contact pressure simultaneously Produce stiction, thus prevent nut 11 bolt 9 from relatively rotating further.
3, starting electric wrench 1, power exports on travelling gear 8, travelling gear 8 and outer sleeve 6 one end Internal gear cooperate so that outer sleeve 6 rotates, and the interior hexangle type of outer sleeve 6 other end accommodates chamber rotational band Dynamic nut 11 rotates.The inner sleeve 5 being connected with bolt 9 is fixed on shell 2, and shell 2 one end is by output Shaft rear end lid 7 is connected with electric wrench 1 so that it is with electric wrench 1 axial restraint.Shell 2 other end is by defeated The counter-force arm 12 of shaft drive end bearing bracket 4 is blocked on the most already installed bolt fastener, axial restraint;
4, during installing, inner sleeve 5 and outer sleeve 6 coaxial cooperation, it is ensured that coaxial bolt 9 and spiral shell Female 11 relatively rotate.When electric wrench works, outer sleeve 6 produces and rotates, and makes the inner sleeve within outer sleeve 6 Cylinder 5 has the trend being driven, and inner sleeve 5 is limited by fixed pin shaft 3, it is impossible to produces and rotates, i.e. inner sleeve 5 and outer sleeve 6 by moment loading in opposite direction.When output torque is bigger, output shaft drive end bearing bracket 4 anti- The arm of force 12 one end, against other fixing object, the most already installed bolt, can prop up bigger counter-force and make With, operator will not feel the biggest counteracting force, it is simple to operation;
5, after installation terminates, close electric wrench 1, installation tool entirety is withdrawn from.Simultaneously can be embedding by split Shell type unilateral bolt fastener adaptor takes off from electric wrench 1, it is simple to use next time of electric wrench 1.

Claims (9)

1. split Nested-type single-side bolt fastener installs an adaptor, is used for installing the monolateral spiral shell of split nested type Bolt securing member, described bolt fastener includes bolt (9), nut (11) and split type pad (10), Described adaptor includes main body, the inner sleeve (5) being fixed in main body fixed position and is set in inner sleeve (5) outside outer sleeve (6), described inner sleeve (5) is used for accommodating and fixing bolt (9), described outside Sleeve (6) is connected with the rotary output axis of drive mechanism, is used for accommodating nut (11) and driving nut (11) Rotate,
It is characterized in that, described outer sleeve (6) inwall is provided with internal gear, and described internal gear is used for and driving External gear (8) engagement on the rotary output axis of mechanism, described main body includes shell (2), described shell (2) in tubular, it is outside that shell (2) is set in outer sleeve (6), and the cylinder of shell (2) is provided with multiple pin Axis hole (31), the cylinder of described outer sleeve (6) is provided with multiple circular hole (32), described inner sleeve (5) Outer wall fixedly mounts multiple bearing pins (3), and described bearing pin (3) is through corresponding circular hole (32) and pin shaft hole (31), during use, drive mechanism drives outer sleeve (6) and nut (11) to rotate, and circular hole (32) has Along the length that outer sleeve (6) is circumferentially extending, it is used for avoiding outer sleeve (6) to collide with bearing pin (3), bearing pin (3) With pin shaft hole (31) diameter matches, inner sleeve (5) and bolt (9) position is made to fix.
A kind of split Nested-type single-side bolt fastener the most according to claim 1 installs adaptor, and it is special Levying and be, the quantity of described pin shaft hole (31), circular hole (32) and bearing pin (3) is 3.
A kind of split Nested-type single-side bolt fastener the most according to claim 2 installs adaptor, and it is special Levying and be, each pin shaft hole (31), each circular hole (32) and each bearing pin (3) are and are equidistantly uniformly distributed.
A kind of split Nested-type single-side bolt fastener the most according to claim 1 installs adaptor, and it is special Levying and be, described inner sleeve (5) outer wall is provided with screwed hole, inner sleeve (5) and described bearing pin (3) spiral shell Stricture of vagina connects.
A kind of split Nested-type single-side bolt fastener the most according to claim 1 installs adaptor, and it is special Levying and be, described main body also includes the rear end cap (7) being arranged on shell (5) one end, described rear end cap (7) Fixing with shell (5) and be connected, the end face of rear end cap (7) is provided with polygon receiving hole, is used for accommodating drive mechanism The polygon shaft shoulder of outfan, described polygon shaft shoulder position is fixed, and prevents shell (5) from rotating.
A kind of split Nested-type single-side bolt fastener the most according to claim 5 installs adaptor, and it is special Levying and be, described rear end cap (7) is threaded connection with shell (5) that part is fixing to be connected.
A kind of split Nested-type single-side bolt fastener the most according to claim 5 installs adaptor, and it is special Levying and be, described bolt (9) and nut (11) are positioned at the front end of shell (2), described rear end cap (7) It is positioned at the rear end of shell (2).
A kind of split Nested-type single-side bolt fastener the most according to claim 7 installs adaptor, and it is special Levying and be, the front end of described shell (2) is provided with drive end bearing bracket (4), and described drive end bearing bracket (4) bottom is provided with anti- The arm of force, described counter-force arm is integrated with drive end bearing bracket (4), and during use, counter-force arm card is the most mounted On bolt, by moment and output shaft equalising torque.
9. according to claim 1~8 arbitrary described a kind of split Nested-type single-side bolt fastener, adaptor is installed, It is characterized in that, described drive mechanism is electric wrench (1).
CN201610322245.5A 2016-05-16 2016-05-16 A kind of split Nested-type single-side bolt fastener installs adapter Expired - Fee Related CN105952742B (en)

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CN201610322245.5A CN105952742B (en) 2016-05-16 2016-05-16 A kind of split Nested-type single-side bolt fastener installs adapter

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CN105952742B CN105952742B (en) 2017-12-26

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106217406A (en) * 2016-09-23 2016-12-14 北京灵铱科技有限公司 Joint is twisted with fast by a kind of robot
CN106704343A (en) * 2017-01-17 2017-05-24 哈尔滨工业大学深圳研究生院 Foldable gasket for single-side bolt, single-side bolt and installing device
CN109158869A (en) * 2018-11-23 2019-01-08 安徽江淮汽车集团股份有限公司 A kind of connecting-rod bolts pre-screwing tooling

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0788777A (en) * 1993-09-20 1995-04-04 Maeda Kinzoku Kogyo Kk Rotary assist tool to be mounted on fastening machine in use
CN102536999A (en) * 2012-02-20 2012-07-04 陈彦 Self-balancing large-diameter bolt and special mechanical torque wrench device for same
CN203600142U (en) * 2013-12-12 2014-05-21 宜昌华益工具制造股份有限公司 Pneumatic nut wrench
CN204997619U (en) * 2015-09-18 2016-01-27 中航商用航空发动机有限责任公司 Lock nut screws up and loosens instrument
CN105328650A (en) * 2015-11-24 2016-02-17 同济大学 Electric mounting tool for split nested one-sided bolt fastener

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0788777A (en) * 1993-09-20 1995-04-04 Maeda Kinzoku Kogyo Kk Rotary assist tool to be mounted on fastening machine in use
CN102536999A (en) * 2012-02-20 2012-07-04 陈彦 Self-balancing large-diameter bolt and special mechanical torque wrench device for same
CN203600142U (en) * 2013-12-12 2014-05-21 宜昌华益工具制造股份有限公司 Pneumatic nut wrench
CN204997619U (en) * 2015-09-18 2016-01-27 中航商用航空发动机有限责任公司 Lock nut screws up and loosens instrument
CN105328650A (en) * 2015-11-24 2016-02-17 同济大学 Electric mounting tool for split nested one-sided bolt fastener

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106217406A (en) * 2016-09-23 2016-12-14 北京灵铱科技有限公司 Joint is twisted with fast by a kind of robot
CN106704343A (en) * 2017-01-17 2017-05-24 哈尔滨工业大学深圳研究生院 Foldable gasket for single-side bolt, single-side bolt and installing device
CN109158869A (en) * 2018-11-23 2019-01-08 安徽江淮汽车集团股份有限公司 A kind of connecting-rod bolts pre-screwing tooling
CN109158869B (en) * 2018-11-23 2020-05-29 安徽江淮汽车集团股份有限公司 Connecting rod bolt is screwed up frock in advance

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