CN107309833B

CN107309833B - Box spanner

Info

Publication number: CN107309833B
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: 2019-03-01
Anticipated expiration: 2037-07-10
Also published as: CN107309833A

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 is formed in the front end of the sleeve body and has polygonal cross-section, the closure member is used to close the rear end of the sleeve body and detachably connected with the sleeve body, one end of the connecting rod is connect with the closure member, the other end is used for connecting power device, the front end of the sleeve body is arranged in the elastic holding structure, to support for elasticity in the bolt head (4) for entering the working chamber.The box spanner can tighten anti-theft bolt and easily and efficiently collect the bolt head for the anti-theft bolt twisted into two parts, and avoid bolt head from falling 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, and in particular, to a kind of box spanner.

Background technique

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 When interface tube, using anti-theft bolt fixed interface, the bolt head of the anti-theft bolt is made of aluminum material.During installation, it operates 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 torque reaches predetermined value, the bolt head of anti-theft bolt can be twisted into two parts.It, can not since bolt head is aluminum material Using magnet, so not easily collecting.Therefore, bolt head can be fallen in the car or on production line, can only be artificially collected, low efficiency, Effect is poor.Once cleaning is not in time, the quality of production of automobile will affect, or fall in apparatus for production line, cause equipment event Barrier stops production.

Summary of the invention

Purpose of this disclosure is to provide a kind of box spanner, which can tighten anti-theft bolt and facilitate height The bolt head for the anti-theft bolt twisted into two parts is collected on effect ground, and bolt head is avoided to fall 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 the goals above, 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 is formed in the front end of the sleeve body and has polygonal cross-section, and the closure member is for after closing the sleeve body It holds and detachably connected with the sleeve body, one end of the connecting rod is connect with the closure member, and the other end is for connecting The front end of the sleeve body is arranged in power device, the elastic holding structure, is entering the work to support for elasticity Make on the bolt head of chamber.

Optionally, the working chamber has regular hexagonal section.

Optionally, it is formed with annular slot on the front end outer peripheral surface of the sleeve body, is opened on the bottom surface of the annular slot Equipped 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 on first steel ball, keeps a part of first steel ball prominent Into the working chamber.

Optionally, the length of the collecting chamber is greater than the length of the working chamber.

Optionally, 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.

Optionally, the box spanner further includes the guide shaft for receiving and guiding bolt head, the guide shaft and the set Cylinder main body coaxial arrangement, the rear end of the guide shaft are connect with the closure member, and the front end of the guide shaft is protruded into the working chamber.

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

Optionally, the sleeve body further includes the assembly cavity being connected to the collecting chamber, and the assembly cavity is formed in institute It states the rear end of sleeve body and there is 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.

Optionally, first annular slot is formed on the side of the closure member, be formed on the side wall of the assembly cavity with The second through-hole that the first annular slot matches, the box spanner further include cutting ferrule and the second steel ball, and the cutting ferrule is arranged Outside the rear end of the sleeve body, the second ring for being suitable for accommodating second steel ball is provided on the medial surface of the cutting ferrule Shape slot, and the cutting ferrule can move axially relative to the sleeve body and have first position and the second position, in institute First position is stated, second annular groove is staggered with the first annular slot, and a part of second steel ball is contained in described In first annular slot, another part is contained in second through-hole, so that the closure member is locked relative to the sleeve body Only；In the second position, second annular groove is aligned with the first annular slot, and a part of the steel ball is contained in institute It states 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.

Optionally, the section of the first annular slot is arch.

Optionally, a side close to second through-hole for second annular groove is formed as guiding surface, this is led To inclined-plane for guiding second steel ball to enter second annular groove.

Optionally, the box spanner further includes the reset spring for the cutting ferrule to be maintained to the first position.

Optionally, the box spanner further includes retainer ring and retaining ring, and the retainer ring and the retaining ring are set in the sleeve The rear end of main body, the retainer ring are used to the retaining ring being fixed on the sleeve body, be formed on the inner wall of the cutting ferrule Step surface, the reset spring are resiliently supported between the step surface and the retaining ring.

Through the above technical solutions, when installing anti-theft bolt using box spanner, firstly, by the front end of sleeve body (that is, Working chamber) it covers 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, it is connect due to connecting rod with power device (for example, pneumatic tool or electric tool), by dynamic The rotation of power device drive sleeve spanner applies torque to bolt head, tightens anti-theft bolt.Connecting rod is connect with power device Part has regular hexagonal section, preferably to transmit power and torque.When torque reaches predetermined value, anti-theft bolt is screwed Disconnected, bolt head is separated with screw rod.Due to the elastic force that elastic holding structure applies, so that bolt head will not take off out of working chamber It falls.Continuing that next anti-theft bolt is installed, next bolt head can will remain in the push-in collecting chamber of the bolt head in working chamber, It is collected by collecting chamber and is stored.When the bolt head collected in collecting chamber reaches certain amount or fills, can by closure member from The rear end of sleeve body disassembles, and bolt head is taken out, and empties collecting chamber.This box spanner can tighten anti-theft bolt and The bolt head twisted into two parts can be easily and efficiently collected, bolt head is avoided to fall in the car or on production line, improves 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 Object is multi-purpose, save the cost.

Other feature and advantage of the disclosure will the following detailed description will be given in the detailed implementation section.

Detailed description of the invention

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

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

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

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

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

Description of symbols

1 sleeve body 1a working chamber

1b collecting chamber 1c annular slot

1d first through hole 1e assembly cavity

2 closure member of the second through-hole of 1f

First annular 3 elastic holding structure of slot of 2a

3a O-ring the first steel ball of 3b

4 bolt head, 5 guide shaft

6 cutting ferrule of 5a guide part

6a the second annular groove 6b guiding surface

7 second steel ball of 6c step surface

8 connecting rod, 9 reset spring

10 retainer ring, 11 retaining ring

Specific embodiment

It is described in detail below in conjunction with specific embodiment of the attached drawing to the disclosure.It should be understood that this place is retouched The specific embodiment stated is only used for describing and explaining the disclosure, is not limited to the disclosure.

In the disclosure, in the absence of explanation to the contrary, the noun of locality used such as " forward and backward " is typically referred in sleeve Before being from the relatively near one end of bolt under the working condition of spanner, after relatively remote one end is.Term " working chamber ", which refers to, to be used for Bolt head and the chamber with the cooperation of bolt head shapes are accommodated, " 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 Structure 3 and connecting rod 8 are kept, the sleeve body 1 includes interconnected working chamber 1a and collecting chamber 1b, the working chamber 1a It is formed in the front end of the sleeve body 1 and there is polygonal cross-section, the closure member 2 is for closing the sleeve body 1 Rear end and detachably connected with the sleeve body 1, one end of the connecting rod 8 is connect with the closure member 2, and the other end is used for The front end of the sleeve body 1 is arranged in connecting power device, the elastic holding structure 3, is being entered with supporting for elasticity On the bolt head 4 of the working chamber 1a.

As shown in Fig. 5 to Fig. 8, when anti-theft bolt being installed using box spanner, firstly, as shown in Figure 3 and Figure 6, by sleeve The front end (that is, working chamber 1a) of main body 1 covers on the bolt head 4 of anti-theft bolt, and 3 elasticity of elastic holding structure is supported in bolt head On 4, that is, support in the side of the close screw rod of bolt head 4；Then, since connecting rod 8 and power device are (for example, pneumatic tool Or electric tool) connection, it is rotated by power device drive sleeve spanner, torque is applied to bolt head 4, tightens anti-theft bolt. The part of connecting rod 8 connecting with power device has regular hexagonal section, preferably to transmit power and torque.Such as Fig. 6 institute Show, when torque reaches predetermined value, anti-theft bolt is twisted into two parts, and bolt head 4 is separated with screw rod.Since elastic holding structure 3 applies Elastic force so that bolt head 4 will not fall off out of working chamber 1a.Continue that next anti-theft bolt, next bolt head 4 are installed The bolt head 4 in working chamber 1a can be will remain in be pushed into collecting chamber 1b, 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 fills, end cap 2 can be dismantled from the rear end of sleeve body 1 Get off, bolt head 4 is taken out, empties collecting chamber 1b.

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

In addition, box spanner of the invention applies also for the installation of common screw bolt and nut, if common bolt and The size and shape and working chamber 1a of nut match, multi-purpose content, save the cost.

As shown in Figure 7 and Figure 8, optionally, the working chamber 1a for example can 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, Optionally, it is formed with annular slot 1c on the front end outer peripheral surface of the sleeve body 1, is offered on the bottom surface of annular slot 1c First through hole 1d, the elastic holding structure 3 include the O-ring 3a that is set on the annular slot 1c and are 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 about set The axisymmetrical setting of cylinder main body 1.As shown in figure 3, since 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, apply elastic bolster guide power to bolt head 4 prevents bolt head 4 from falling off from working chamber 1a with positioning bolt head 4.

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

The section of collecting chamber 1b 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, optionally, the section of the collecting chamber 1b is circle, in order to manufacture, and does not hinder bolt head 4 Sliding.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 when collecting chamber 1b, enter collecting chamber 1b convenient for other bolt heads 4.

In order to be arranged in bolt head 4 fitly in collecting chamber 1b, it is optionally, described as shown in Figure 1 to Figure 4 and shown in Fig. 8 Box spanner further includes the guide shaft 5 for 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 connect with the closure member 2, and the front end of the guide shaft 5 is protruded into the working chamber 1a.It is antitheft installing When bolt, the front end of guide shaft 5 close to anti-theft bolt bolt head 4 and bolt head 4 can be withstood, guidance is played to bolt head 4 And position-limiting action, prevent anti-theft bolt from deviating or sliding into collecting chamber 1b.As shown in figure 8, after bolt head 4 is twisted into two parts, spiral shell Bolt head 4, by next bolt head 4 push-in collecting chamber 1b, is set on guide shaft 5, proper alignment along guide shaft 5.When the spiral shell of collection After bolt head 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, optionally, 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, and bolt head 4 is smoothly slided on guide shaft 5.

In order to make closure member 2 and 1 stable connection of sleeve body, as shown in Figure 1 to Figure 3, optionally, the sleeve body 1 It further include that the assembly cavity 1e, the assembly cavity 1e being connected to the collecting chamber 1b are formed 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 and shown in Fig. 8, in present embodiment, closure member The section of 2 and assembly cavity 1e is regular hexagon, and when so that closure member 2 being installed in sleeve body 1, shape is matched between the two It closes, when tightening anti-theft bolt, is not susceptible to slide relatively between closure member 2 and sleeve body 1, so as to preferably transmit Torque.

In order to which closure member 2 and sleeve body 1 can be removably joined together by any suitable mode.Such as Fig. 1 To shown in Fig. 4, optionally, first annular slot 2a, shape on the side wall of the assembly cavity 1e are formed on the side of the closure member 2 The second through-hole 1f that first annular slot 2a described in Cheng Youyu matches, the box spanner further include cutting ferrule 6 and the second steel ball 7, The cutting ferrule 6 is set in outside the rear end of the sleeve body 1, is provided with described in being suitable for accommodating on the medial surface of the cutting ferrule 6 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 have the One position and the second position, in the first position, the second annular groove 6a is staggered with the first annular slot 2a, and described A part of two steel balls 7 is contained in the first annular slot 2a, and another part is contained in the second through-hole 1f, so that institute Closure member 2 is stated relative to 1 locking of sleeve body；In the second position, the second annular groove 6a and first ring Shape slot 2a alignment, a part of the steel ball 7 are contained in the second through-hole 1f, and another part is contained in second annular In slot 6a, so that the closure member 2 and the sleeve body 1 are separable.

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 slot 2a under the action of cutting ferrule 6, realize closure member 2 and 1 locking of sleeve body, prevent work When closure member 2 and sleeve body 1 disengage.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 position, while pulling out closure member outward 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 enters the second annular groove 6a by promotion, enables closure member 2 relative to set Cylinder main body 1 is mobile, and then the two separates.

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

As shown in Figures 1 to 4, in order to make the second steel ball 7 preferably between first annular slot 2a and the second annular groove 6a Mobile, optionally, the section of the first annular slot 2a is arch, so that the second steel ball 7 will not block in first annular slot 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 slot 2a Shape slot 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, optionally, the second annular groove 6a Be formed as guiding surface 6b close to a side of the second through-hole 1f, guiding surface 6b is tilted and is used for from front to back It guides second steel ball 7 to enter the second annular groove 6a, the second steel ball 7 is enabled more to smoothly enter the second annular groove 6a。

As shown in Figures 1 to 4, in order to reset to cutting ferrule 6, optionally, the box spanner further includes for by institute State the reset 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 Under the action of the restoring force of position spring 9, it is moved to first position from the second position, realizes the reset of cutting ferrule 6.Alternatively, that will seal When closing member 2 again connects to sleeve body 1, cutting ferrule 6 is moved under the action of the restoring force of reset spring 9 from the second position First position, so that the second steel ball 7 is pressed against on first annular slot 2a by cutting ferrule 6, closure member 2 is stated in realization and sleeve body 1 is locked Only.

As shown in Figures 1 to 4, reset spring 9 in order to facilitate the installation of, optionally, the box spanner further includes retainer ring 10 With retaining ring 11, the retainer ring 10 and the retaining ring 11 are set in the rear end of the sleeve body 1, and the retainer ring 10 will be for will be described Retaining ring 11 is fixed in the sleeve body 1, and step surface 6c, 9 elasticity of reset spring are formed on the inner wall of the cutting ferrule 6 It is supported between the step surface 6c and the retaining ring 11.

The rear end of sleeve body 1 is formed with the third annular groove of installation retainer ring 10, and the section of retaining ring 11 is formed as L shape and set It is located at the outside of retainer ring 10, is contained in a part of retainer ring 10 in retaining ring 11, retainer ring 10 can limit retaining ring 11 and move backward. One end of cutting ferrule 6 is set in outside retaining ring 11, and the both ends of reset spring 9 are resiliently supported on step surface 6c and retaining ring 11, so that The simple installation of reset spring 9 is easy assembly.

In addition, as shown in Figures 1 to 4, being also formed with another on the inner wall of cutting ferrule 6 to limit the stroke of cutting ferrule 6 Terrace, in the second position, which can be resisted against on retaining ring 11, prevent cutting ferrule 6 is from continuing to be axially moveable, To limit its position, cutting ferrule 6 is prevented to be detached from from sleeve body 1.

The preferred embodiment of the disclosure is described in detail in conjunction with attached drawing above, 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 to the technical solution of the disclosure Monotropic type, these simple variants belong to the protection scope of the disclosure.

It is further to note that specific technical features described in the above specific embodiments, in not lance In the case where shield, can be combined in any appropriate way, in order to avoid unnecessary repetition, the disclosure to it is various can No further explanation will be given for the combination of energy.

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

Claims

1. a kind of box spanner, which is characterized 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) is formed in the front end of the sleeve body (1) and has polygonal cross-section, and the closure member (2) is for closing the set The rear end of cylinder main body (1) and, one end of the connecting rod (8) and the closure member detachably connected with the sleeve body (1) (2) it connects, the other end is used for connecting power device, and the elastic holding structure (3) is arranged before the sleeve body (1) End, to support for elasticity in the bolt head (4) for entering the working chamber (1a),

Wherein, the box spanner further include for receiving and guiding the guide shaft of bolt head (4) (5), the guide shaft (5) with it is described Sleeve body (1) coaxial arrangement, the rear end of the guide shaft (5) are connect with the closure member (2), and the front end of the guide shaft (5) is stretched Enter in the working chamber (1a).

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

3. box spanner according to claim 1, which is characterized in that shape on the front end outer peripheral surface of the sleeve body (1) It at there is annular slot (1c), is offered on the bottom surface of the annular slot (1c) first through hole (1d), the elastic holding structure (3) 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 on first steel ball (3b), keeps a part of first steel ball (3b) prominent In to the working chamber (1a).

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

5. box spanner according to claim 1, which is characterized 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. box spanner according to any one of claims 1-5, which is characterized in that the front end of the guide shaft (5) has The guide part (5a) of tapers forward.

7. box spanner according to any one of claims 1-5, which is characterized in that the sleeve body (1) further includes The assembly cavity (1e) being connected to the collecting chamber (1b), the assembly cavity (1e) be formed in the rear end of the sleeve body (1) and With noncircular cross section, the closure member (2) is shape-ordinatedly plugged in the assembly cavity (1e), after the guide shaft (5) End is connected with the closure member (2).

8. box spanner according to claim 7, which is characterized in that be formed with first on the side of the closure member (2) Annular groove (2a) is formed with the second through-hole to match with the first annular slot (2a) on the side wall of the assembly cavity (1e) (1f), the box spanner further include 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 for being suitable for accommodating second steel ball (7) is provided on the medial surface of the cutting ferrule (6) (6a), and the cutting ferrule (6) can move axially relative to the sleeve body (1) and have first position and second It sets, in the first position, second annular groove (6a) is staggered with the first annular slot (2a), second steel ball (7) A part be contained in the first annular slot (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 position, second annular groove (6a) and described the One annular groove (2a) alignment, a part of the steel ball (7) are contained in second through-hole (1f), and another part is contained in institute It states in the second annular groove (6a), so that the closure member (2) and the sleeve body (1) are separable.

9. box spanner according to claim 8, which is characterized in that the section of the first annular slot (2a) is arch.

10. box spanner according to claim 8, which is characterized in that second annular groove (6a) close to described the One side of two through-holes (1f) is formed as guiding surface (6b), and the guiding surface (6b) is for guiding second steel ball (7) Into second annular groove (6a).

11. box spanner according to claim 8, which is characterized in that the box spanner further includes for by the card Set (6) is maintained at the reset spring (9) of the first position.

12. box spanner according to claim 11, which is characterized in that the box spanner further includes retainer ring (10) and gear Circle (11), the retainer ring (10) and the retaining ring (11) are set in the rear end of the sleeve body (1), and the retainer ring (10) is used for The retaining ring (11) is fixed on the sleeve body (1), is formed with step surface (6c), institute on the inner wall of the cutting ferrule (6) Reset spring (9) is stated to be resiliently supported between the step surface (6c) and the retaining ring (11).