CN107309833A

CN107309833A - Box spanner

Info

Publication number: CN107309833A
Application number: CN201710557628.5A
Authority: CN
Inventors: 王志伟; 罗伟明; 魏建生; 于健; 茹晨绪
Original assignee: Beijing Hyundai Motor Co Ltd
Current assignee: Beijing Hyundai Motor Co Ltd
Priority date: 2017-07-10
Filing date: 2017-07-10
Publication date: 2017-11-03
Anticipated expiration: 2037-07-10
Also published as: CN107309833B

Abstract

This disclosure relates to a kind of box spanner, wherein, the box spanner includes sleeve body (1), closure member (2), elastic holding structure (3) and connecting rod (8), the sleeve body includes interconnected working chamber (1a) and collecting chamber (1b), the working chamber formation is in the front end of the sleeve body and with polygonal cross-section, the closure member is used for the rear end for closing the sleeve body and detachably connected with the sleeve body, one end of the connecting rod is connected with the closure member, the other end is used for connecting power device, the elastic holding structure is arranged on the front end of the sleeve body, supported for elasticity on the bolt head (4) of the working chamber is entered.The box spanner can tighten anti-theft bolt, the bolt head for the anti-theft bolt twisted into two parts can easily and efficiently be collected again, it is to avoid bolt head drops in the car or on production line, moreover it can be used to the installation and removal of plain bolt and nut.

Description

Box spanner

Technical field

This disclosure relates to field of tool, in particular it relates to a kind of box spanner.

Background technology

In the manufacturing process of automobile, the air inlet pressure-air that engine with supercharger is installed on the assembly line of assembly shop is led During interface tube, using anti-theft bolt fixed interface, the bolt head of the anti-theft bolt is made up of aluminum material.When mounted, operate Air inlet air-blast connection pipe interface is first assembled to installation site by personnel, is then tightened using pneumatic tool anti-at catheter interface Steal bolt.When moment of torsion reaches predetermined value, the bolt head of anti-theft bolt can be twisted into two parts.Because bolt head is aluminum material, it is impossible to Using magnet, so not easily collecting.Therefore, bolt head can drop in the car or on production line, can only artificially collect, efficiency is low, Effect is poor.Once cleaning is not in time, the quality of production of automobile can be influenceed, or is dropped in apparatus for production line, equipment event is caused Barrier stops production.

The content of the invention

The purpose of the disclosure is to provide a kind of box spanner, and the box spanner can tighten anti-theft bolt, and can be convenient high Collect the bolt head for the anti-theft bolt twisted into two parts in effect ground, it is to avoid bolt head drops in the car or on production line, moreover it can be used to common The installation and removal of screw bolt and nut.

To achieve these goals, the disclosure provides a kind of box spanner, wherein, the box spanner include sleeve body, Closure member, elastic holding structure and connecting rod, the sleeve body include interconnected working chamber and collecting chamber, the work Chamber formation is in the front end of the sleeve body and with polygonal cross-section, and the closure member is used to close after the sleeve body Hold and detachably connected with the sleeve body, one end of the connecting rod is connected with the closure member, the other end is used to connect Power set, the elastic holding structure is arranged on the front end of the sleeve body, is supported for elasticity and is entering the work Make on the bolt head of chamber.

Alternatively, the working chamber has regular hexagonal section.

Alternatively, annular slot is formed with the front end outer peripheral face of the sleeve body, is opened on the bottom surface of the annular slot Provided with first through hole, the elastic holding structure includes the O-ring being set on the annular slot and is contained in described first The first steel ball in through hole, the O-ring elasticity, which is pressed against, makes a part for first steel ball prominent on first steel ball Into the working chamber.

Alternatively, the length of the collecting chamber is more than the length of the working chamber.

Alternatively, the section of the collecting chamber is circle, and the external diameter of a circle of the working chamber is less than the collecting chamber Diameter.

Alternatively, the box spanner also includes the guide shaft for being used to receiving and guiding bolt head, the guide shaft and the set Cylinder main body is coaxially disposed, and the rear end of the guide shaft is connected with the closure member, and the front end of the guide shaft is stretched into the working chamber.

Alternatively, the front end of the guide shaft has the guide part of tapers forward.

Alternatively, the sleeve body also includes the assembly cavity connected with the collecting chamber, and the assembly cavity formation is in institute State the rear end of sleeve body and with noncircular cross section, the closure member is shape-ordinatedly plugged in the assembly cavity, described The rear end of guide shaft is connected with the closure member.

Alternatively, be formed with the side of the closure member on first annular groove, the side wall of the assembly cavity be formed with The second through hole that the first annular groove matches, the box spanner also includes cutting ferrule and the second steel ball, and the cutting ferrule is arranged Outside the rear end of the sleeve body, the second ring suitable for accommodating second steel ball is provided with the medial surface of the cutting ferrule Shape groove, and the cutting ferrule can be relative to sleeve body axial movement and with first position and the second place, in institute First position is stated, second annular groove staggers with the first annular groove, the part of second steel ball is contained in described In first annular groove, another part is contained in second through hole, so that the closure member is locked relative to the sleeve body Only；In the second place, second annular groove aligns with the first annular groove, and a part for the steel ball is contained in institute State in the second through hole, another part is contained in second annular groove, so that the closure member can divide with the sleeve body From.

Alternatively, the section of the first annular groove is arch.

Alternatively, a side of close second through hole of second annular groove is formed as guiding surface, and this is led It is used to guide second steel ball to enter second annular groove to inclined-plane.

Alternatively, the box spanner also includes the back-moving spring for being used to being maintained at the cutting ferrule into the first position.

Alternatively, the box spanner also includes collar and back-up ring, and the collar and the back-up ring are set in the sleeve The rear end of main body, the collar is used to the back-up ring being fixed on the sleeve body, the inwall of the cutting ferrule to be formed with Step surface, the back-moving spring is resiliently supported between the step surface and the back-up ring.

By above-mentioned technical proposal, when anti-theft bolt being installed using box spanner, first, by the front end of sleeve body (i.e., Working chamber) it is enclosed on the bolt head of anti-theft bolt, elastic holding structure's elasticity is supported on bolt head, that is, is supported in bolt head Close to the side of screw rod；Then, because connecting rod is connected with power set (for example, pneumatic tool or electric tool), by dynamic Power apparatus drive sleeve spanner rotates, and applies moment of torsion to bolt head, tightens anti-theft bolt.Connecting rod is connected with power set Part has regular hexagonal section, preferably to transmit power and moment of torsion.When moment of torsion reaches predetermined value, anti-theft bolt is screwed Disconnected, bolt head is separated with screw rod.The elastic force applied due to elastic holding structure so that bolt head will not take off out of working chamber Fall.Continue that next anti-theft bolt is installed, next bolt head can will remain in the bolt head push-in collecting chamber in working chamber, Collected by collecting chamber and stored.When the bolt head collected in collecting chamber reaches certain amount or filled, can by closure member from The rear end of sleeve body is disassembled, and bolt head is taken out, and empties collecting chamber.This box spanner can tighten anti-theft bolt, again The bolt head twisted into two parts can easily and efficiently be collected, it is to avoid bolt head drops in the car or on production line, improve the production of automobile Quality, prevents apparatus for production line failure.In addition, this box spanner can be used for the installation and removal of plain bolt and nut, one Thing is used, cost-effective.

Other feature and advantage of the disclosure will be described in detail in subsequent embodiment part.

Brief description of the drawings

Accompanying drawing is, for providing further understanding of the disclosure, and to constitute a part for specification, with following tool Body embodiment is used to explain the disclosure together, but does not constitute limitation of this disclosure.In the accompanying drawings：

Fig. 1 is half sectional view of the box spanner of the embodiment of the present invention when cutting ferrule is in first position；

Fig. 2 is half sectional view of the box spanner of the embodiment of the present invention when cutting ferrule is in first position；

Fig. 3 is the box spanner and the assembling schematic diagram of anti-theft bolt of the embodiment of the present invention；

Fig. 4 is half sectional view of the box spanner of the embodiment of the present invention when cutting ferrule is in the second place；Fig. 5 It is the schematic diagram of the course of work of the box spanner of the embodiment of the present invention to Fig. 8.

Description of reference numerals

1 sleeve body 1a working chambers

1b collecting chamber 1c annular slots

1d first through hole 1e assembly cavities

The closure member of the second through holes of 1f 2

The first annular elastic holding structures of groove 3 of 2a

3a O-rings the first steel balls of 3b

The guide shaft of 4 bolt head 5

The cutting ferrule of 5a guide parts 6

6a the second annular groove 6b guiding surfaces

The steel ball of 6c step surfaces 7 second

The back-moving spring of 8 connecting rod 9

The back-up ring of 10 collar 11

Embodiment

It is described in detail below in conjunction with accompanying drawing embodiment of this disclosure.It should be appreciated that this place is retouched The embodiment stated is merely to illustrate and explained the disclosure, is not limited to the disclosure.

In the disclosure, in the case where not making opposite explanation, the noun of locality used such as " forward and backward " is typically referred in sleeve Before being from the relative proximity of one end of bolt under the working condition of spanner, after relatively remote one end is.Term " working chamber " refers to be used for Accommodate bolt head and with the chamber of bolt head form fit, " collecting chamber " refers to the chamber for collecting the bolt head twisted into two parts.

As shown in Figures 1 to 4, a kind of box spanner, wherein, the box spanner includes sleeve body 1, closure member 2, elasticity Holding structure 3 and connecting rod 8, the sleeve body 1 include interconnected working chamber 1a and collecting chamber 1b, the working chamber 1a Formed in the front end of the sleeve body 1 and with polygonal cross-section, the closure member 2 is used to close the sleeve body 1 Rear end and detachably connected with the sleeve body 1, one end of the connecting rod 8 is connected with the closure member 2, and the other end is used for Connecting power device, the elastic holding structure 3 is arranged on the front end of the sleeve body 1, supports and is entering for elasticity On the bolt head 4 of the working chamber 1a.

As shown in Fig. 5 to Fig. 8, when installing anti-theft bolt using box spanner, first, as shown in Figure 3 and Figure 6, by sleeve The front end (that is, working chamber 1a) of main body 1 is enclosed on the bolt head 4 of anti-theft bolt, and the elasticity of elastic holding structure 3 is supported in bolt head On 4, that is, support in the side of the close screw rod of bolt head 4；Then, because connecting rod 8 and power set are (for example, pneumatic tool Or electric tool) connection, rotated by power set drive sleeve spanner, moment of torsion is applied to bolt head 4, anti-theft bolt is tightened. The part being connected with power set of connecting rod 8 has regular hexagonal section, preferably to transmit power and moment of torsion.Such as Fig. 6 institutes Show, when moment of torsion reaches predetermined value, anti-theft bolt is twisted into two parts, and bolt head 4 is separated with screw rod.Because elastic holding structure 3 applies Elastic force so that bolt head 4 will not come off out of working chamber 1a.Continue that next anti-theft bolt, next bolt head 4 are installed It can will remain in the push-in collecting chamber of bolt head 4 1b in working chamber 1a, be collected and stored by collecting chamber 1b.As shown in figure 8, working as When the bolt head 4 collected in collecting chamber 1b reaches certain amount or filled, end cap 2 can be dismantled from the rear end of sleeve body 1 Get off, bolt head 4 is taken out, empty collecting chamber 1b.

This box spanner can tighten anti-theft bolt, the bolt head 4 twisted into two parts can easily and efficiently be collected again, it is to avoid bolt First 4 drop in the car or on production line, improve the quality of production of automobile, prevent apparatus for production line failure.

In addition, the box spanner of the present invention applies also for the installation of common screw bolt and nut, if common bolt and The size and shape of nut matches with working chamber 1a, and one-object-many-purposes are cost-effective.

As shown in Figure 7 and Figure 8, alternatively, the working chamber 1a can for example have equilateral triangle, square, positive six side The section of the shapes such as shape, octagon, dodecagon.

Elastic holding structure 3 can be various structures, such as spring steel ball structure, clip spring structure.As shown in Figures 1 to 4, Alternatively, annular slot 1c is formed with the front end outer peripheral face of the sleeve body 1, is offered on annular slot 1c bottom surface First through hole 1d, the elastic holding structure 3 includes the O-ring 3a that is set on the annular slot 1c and is contained in described the The first steel ball 3b in one through hole 1d, the O-ring 3a elasticity, which is pressed against on the first steel ball 3b, makes the first steel ball 3b A part be projected into the working chamber 1a.First through hole 1d and the first steel ball 3b can be respectively two and on set The axisymmetrical of cylinder main body 1 is set.As shown in figure 3, because O-ring 3a applies elastic force to the first steel ball 3b, the first steel ball 3b's The partial elastic backstop in working chamber 1a is projected on bolt head 4, i.e., elastic bolster guide bolt head 4 close screw rod one Side, applies elastic bolster guide power to bolt head 4, with bolt first 4, prevents bolt head 4 from being come off from working chamber 1a.

In order to be able to more collect bolt head 4, as shown in Figures 1 to 4, alternatively, the length of the collecting chamber 1b is more than The length of the working chamber 1a so that collecting chamber 1b space is larger, more can collect and store the bolt head 4 twisted into two parts.

Collecting chamber 1b section can have any shape and size, in order to which bolt head 4 can smoothly enter collecting chamber 1b, As shown in Figures 1 to 4, alternatively, the section of the collecting chamber 1b is circle, in order to manufacture, and does not hinder bolt head 4 Slide.The external diameter of a circle of the working chamber 1a is less than the diameter of the collecting chamber 1b so that the bolt head 4 twisted into two parts enters It will not be stuck, and can be slided in collecting chamber 1b during collecting chamber 1b, be easy to other bolt heads 4 to enter collecting chamber 1b.

In order that bolt head 4 is fitly arranged in collecting chamber 1b, as shown in Figure 1 to Figure 4 with shown in Fig. 8, it is alternatively, described Box spanner also includes the guide shaft 5 for being used to receiving and guiding bolt head 4, and the guide shaft 5 is coaxially disposed with the sleeve body 1, The rear end of the guide shaft 5 is connected with the closure member 2, and the front end of the guide shaft 5 is stretched into the working chamber 1a.It is antitheft installing During bolt, the front end of guide shaft 5 close to anti-theft bolt bolt head 4 and bolt head 4 can be withstood, guiding is played to bolt head 4 And position-limiting action, prevent anti-theft bolt from offseting or slipping into collecting chamber 1b.As shown in figure 8, after bolt head 4 is twisted into two parts, spiral shell Bolt first 4 is pushed into collecting chamber 1b along guide shaft 5 by next bolt head 4, is set on guide shaft 5, proper alignment.When the spiral shell of collection After bolt first 4 is more, closure member 2 is opened, bolt head 4 is slid along guide shaft 5, is convenient to clean.

In order to preferably guide bolt head 4, as shown in Figures 1 to 4, alternatively, the front end of the guide shaft 5 has forward gradually The guide part 5a of contracting, guide part 5a can be formed as cone so that bolt head 4 can be slided into smoothly on guide shaft 5.

In order that closure member 2 and the stable connection of sleeve body 1, as shown in Figure 1 to Figure 3, alternatively, the sleeve body 1 Also include the assembly cavity 1e connected with the collecting chamber 1b, the assembly cavity 1e formation is in the rear end of the sleeve body 1 and tool There is noncircular cross section (for example, triangle, square, arch etc.), the closure member 2 is shape-ordinatedly plugged in the assembly cavity In 1e, the rear end of the guide shaft 5 is connected with the closure member 2.As shown in Figure 1 to Figure 4 with shown in Fig. 8, in present embodiment, closure member 2 and assembly cavity 1e section is regular hexagon so that when closure member 2 is installed in sleeve body 1, shape is matched somebody with somebody between the two Close, when tightening anti-theft bolt, relative slip is not susceptible between closure member 2 and sleeve body 1, so as to preferably transmit Moment of torsion.

In order to which closure member 2 and sleeve body 1 can be removably joined together by any appropriate mode.Such as Fig. 1 Shown in Fig. 4, alternatively, shape on first annular groove 2a, the side wall of the assembly cavity 1e is formed with the side of the closure member 2 The second through hole 1f that first annular groove 2a described in Cheng Youyu matches, the box spanner also includes the steel ball 7 of cutting ferrule 6 and second, The cutting ferrule 6 is set in outside the rear end of the sleeve body 1, is provided with the medial surface of the cutting ferrule 6 described suitable for accommodating Second annular groove 6a of the second steel ball 7, and the cutting ferrule 6 can move axially relative to the sleeve body 1 and with the One position and the second place, in the first position, the second annular groove 6a staggers with the first annular groove 2a, and described A part for two steel balls 7 is contained in the first annular groove 2a, and another part is contained in the second through hole 1f, so that institute Closure member 2 is stated relative to the locking of sleeve body 1；In the second place, the second annular groove 6a and first ring Shape groove 2a is alignd, and a part for the steel ball 7 is contained in the second through hole 1f, and another part is contained in second annular In groove 6a, so that the closure member 2 is separated with the sleeve body 1.

As shown in Figure 1 to Figure 3, when closure member 2 is installed to the rear end of sleeve body 1 and cutting ferrule 6 is in first position, the Two steel balls 7 are connected in first annular groove 2a in the presence of cutting ferrule 6, realize closure member 2 and the locking of sleeve body 1, prevent work When closure member 2 disengaged with sleeve body 1.As shown in figure 4, when the bolt head 4 collected in collecting chamber 1b reaches certain amount or dress Man Shi, can make cutting ferrule 6 be in the second place, while outwards pulling out closure member manually relative to sleeve body 1 to pusher cutting ferrule 6 2, pulling force is applied to closure member 2, then the second steel ball 7 is entered the second annular groove 6a by promotion, enables closure member 2 relative to set Cylinder main body 1 is moved, and then both separation.

As shown in figure 8, closure member 2 removes bolt head 4 after the dismounting of sleeve body 1 from guide shaft 5, after the completion of Closure member 2 is inserted into assembly cavity 1e again, cutting ferrule 6 is reset to first position, the second steel ball 7 blocks in the presence of cutting ferrule 6 First annular groove 2a is connected to, then closure member 2 links together with sleeve body 1.

As shown in Figures 1 to 4, in order that the second steel ball 7 is preferably between first annular groove 2a and the second annular groove 6a Mobile, alternatively, the section of the first annular groove 2a is arch, so that the second steel ball 7 will not block in first annular groove 2a Extremely, when applying outside pulling force to closure member 7, the second steel ball 7 easily can slip into the second ring from first annular groove 2a Shape groove 6a so that the convenient disassembly of closure member 2.

As shown in Figures 1 to 4, in order to preferably guide the movement of the second steel ball 7, alternatively, the second annular groove 6a A close second through hole 1f side be formed as guiding surface 6b, guiding surface 6b is tilted and is used for from front to back Second steel ball 7 is guided to enter the second annular groove 6a so that the second steel ball 7 can more smoothly enter the second annular groove 6a。

As shown in Figures 1 to 4, in order to be resetted to cutting ferrule 6, alternatively, the box spanner also includes being used for institute State the back-moving spring 9 that cutting ferrule 6 is maintained at the first position.After closure member 2 is dismantled out of sleeve body 1, cutting ferrule 6 is multiple In the presence of the restoring force of position spring 9, first position is moved to from the second place, the reset of cutting ferrule 6 is realized.Or, it will seal When closing member 2 again connects to sleeve body 1, cutting ferrule 6 is moved in the presence of the restoring force of back-moving spring 9 from the second place First position, so that the second steel ball 7 is pressed against on first annular groove 2a by cutting ferrule 6, realization is stated closure member 2 and locked with sleeve body 1 Only.

As shown in Figures 1 to 4, back-moving spring 9 is installed for convenience, alternatively, the box spanner also includes collar 10 With back-up ring 11, the collar 10 and the back-up ring 11 are set in the rear end of the sleeve body 1, and the collar 10 is used for will be described Back-up ring 11 is fixed in the sleeve body 1, and step surface 6c, the elasticity of back-moving spring 9 are formed with the inwall of the cutting ferrule 6 It is supported between the step surface 6c and the back-up ring 11.

The rear end of sleeve body 1 is formed with the 3rd annular groove for installing collar 10, and the section of back-up ring 11 is formed as L-shaped and set The outside of collar 10 is located at, a part for collar 10 is contained in back-up ring 11, collar 10 can limit back-up ring 11 and be moved rearwards by. One end of cutting ferrule 6 is set in outside back-up ring 11, and the two ends of back-moving spring 9 are resiliently supported on step surface 6c and back-up ring 11 so that The simple installation of back-moving spring 9, easily assembling.

In addition, the stroke in order to limit cutting ferrule 6, as shown in Figures 1 to 4, another is also formed with the inwall of cutting ferrule 6 Terrace, in the second place, another step surface can be resisted against on back-up ring 11 so that cutting ferrule 6 can not continue to be axially moveable, To limit its position, prevent cutting ferrule 6 from departing from from sleeve body 1.

The preferred embodiment of the disclosure is described in detail above in association with accompanying drawing, still, the disclosure is not limited to above-mentioned reality The detail in mode is applied, in the range of the technology design of the disclosure, a variety of letters can be carried out with technical scheme of this disclosure Monotropic type, these simple variants belong to the protection domain of the disclosure.

It is further to note that each particular technique feature described in above-mentioned embodiment, in not lance In the case of shield, can be combined by any suitable means, in order to avoid unnecessary repetition, the disclosure to it is various can The combination of energy no longer separately illustrates.

In addition, can also be combined between a variety of embodiments of the disclosure, as long as it is without prejudice to originally Disclosed thought, it should equally be considered as disclosure disclosure of that.

Claims

1. a kind of box spanner, it is characterised in that the box spanner includes sleeve body (1), closure member (2), elastically keeps knot Structure (3) and connecting rod (8), the sleeve body (1) include interconnected working chamber (1a) and collecting chamber (1b), the work Chamber (1a) formation is in the front end of the sleeve body (1) and with polygonal cross-section, and the closure member (2) is used to close the set The rear end of cylinder main body (1) and, one end and the closure member of the connecting rod (8) detachably connected with the sleeve body (1) (2) connect, the other end is used for connecting power device, the elastic holding structure (3) is arranged on before the sleeve body (1) End, is supported on the bolt head (4) of the working chamber (1a) is entered for elasticity.

2. box spanner according to claim 1, it is characterised in that the working chamber (1a) has regular hexagonal section.

3. box spanner according to claim 1, it is characterised in that shape on the front end outer peripheral face of the sleeve body (1) Into there is annular slot (1c), first through hole (1d), the elastic holding structure (3) are offered on the bottom surface of the annular slot (1c) Including the O-ring (3a) being set on the annular slot (1c) and the first steel ball being contained in the first through hole (1d) (3b), O-ring (3a) elasticity, which is pressed against, makes a part for first steel ball (3b) prominent on first steel ball (3b) In to the working chamber (1a).

4. box spanner according to claim 1, it is characterised in that the length of the collecting chamber (1b) is more than the work The length of chamber (1a).

5. box spanner according to claim 1, it is characterised in that the section of the collecting chamber (1b) is circle, described The external diameter of a circle of working chamber (1a) is less than the diameter of the collecting chamber (1b).

6. the box spanner according to any one of claim 1-5, it is characterised in that the box spanner also includes being used for The guide shaft (5) of bolt head (4) is received and guides, the guide shaft (5) is coaxially disposed with the sleeve body (1), the guide shaft (5) Rear end be connected with the closure member (2), the front end of the guide shaft (5) is stretched into the working chamber (1a).

7. box spanner according to claim 6, it is characterised in that the front end of the guide shaft (5) has tapers forward Guide part (5a).

8. box spanner according to claim 6, it is characterised in that the sleeve body (1) also includes collecting with described The assembly cavity (1e) of chamber (1b) connection, the assembly cavity (1e) is formed in the rear end of the sleeve body (1) and with non-circular Section, the closure member (2) is shape-ordinatedly plugged in the assembly cavity (1e), rear end and the envelope of the guide shaft (5) Closing member (2) is connected.

9. box spanner according to claim 8, it is characterised in that be formed with first on the side of the closure member (2) The second through hole matched with the first annular groove (2a) is formed with annular groove (2a), the side wall of the assembly cavity (1e) (1f), the box spanner also includes cutting ferrule (6) and the second steel ball (7), and the cutting ferrule (6) is set in the sleeve body (1) Rear end outside, the second annular groove suitable for accommodating second steel ball (7) is provided with the medial surface of the cutting ferrule (6) (6a), and the cutting ferrule (6) can be relative to the sleeve body (1) axial movement and with first position and second Put, in the first position, second annular groove (6a) is staggered with the first annular groove (2a), second steel ball (7) A part be contained in the first annular groove (2a), another part is contained in second through hole (1f), so that described Closure member (2) is relative to the sleeve body (1) locking；In the second place, second annular groove (6a) and described the One annular groove (2a) is alignd, and a part for the steel ball (7) is contained in second through hole (1f), and another part is contained in institute State in the second annular groove (6a), so that the closure member (2) is separated with the sleeve body (1).

10. box spanner according to claim 9, it is characterised in that the section of the first annular groove (2a) is arch.

11. box spanner according to claim 9, it is characterised in that close described the of second annular groove (6a) One side of two through holes (1f) is formed as guiding surface (6b), and the guiding surface (6b) is used to guide second steel ball (7) Into second annular groove (6a).

12. box spanner according to claim 9, it is characterised in that the box spanner also includes being used for the card Set (6) is maintained at the back-moving spring (9) of the first position.

13. box spanner according to claim 12, it is characterised in that the box spanner also includes collar (10) and gear Circle (11), the collar (10) and the back-up ring (11) are set in the rear end of the sleeve body (1), and the collar (10) is used for The back-up ring (11) is fixed in the sleeve body (1), step surface (6c), institute are formed with the inwall of the cutting ferrule (6) Back-moving spring (9) is stated to be resiliently supported between the step surface (6c) and the back-up ring (11).