CN1262162A - Tool and eccentric tool for trapping and detaching unidirectional fixer - Google Patents

Abstract

A tool for detaching existing unidirectional fixer is composed of an axle ring and a detachable axle rod installed in axle ring. Said axle rod is made up to engage with the correspondent region of fixer head. Said axle ring has a recess with longitudinal rib for matching with the peripheral part of fixer head. The cooperation of axle rod and axle ring can apply a turning force to the fixer for taking it out.

Description

Be used to insert and remove the instrument and the eccentric instrument of unidirectional fixer

The present invention relates to be used to remove the device of fixator, particularly relate to a kind of device, be used to remove and have two flat parts and two projectioies and be located in unidirectional fixers in radially relative two quadrants partly, usually.

Unidirectional fixer is many known fastening means.General speech, the characteristic that is had in these fixator designs is to allow its screw thread stem, be generally the threaded screw form, pass one of works aperture, second works of last " piercing " positioned adjacent is till fixator head and the engagement of first works.The fixator head is in case mesh with first works, this unidirectional fixer promptly is difficult to removal, because radially relative two flat parts and two projection part institute tool situations, provide a depression partly can accept screwdriver, and when the screwdriver clockwise direction rotates, allowing screwdriver is strong, fixator is inserted second works, only when screwdriver counterclockwise rotates, then stop it that fixator is withdrawn from.

Existing unidirectional fixer generally has existing cheese head screw radially relative, that two quadrant positions are scabbled.This round end characteristic to withdrawing from the problem of a unidirectional fixer, is contributed much.Unidirectional fixer is broken works aspect with the fixator combination to unauthorized personage or malicious sabotage person, and is most effective.Yet, in fact arranged certainly the opportunity that needs to remove unidirectional fixer.

Prior art withdraw from device, be to utilize class such as jaw, hold fixator head side, to reach the purpose of dismounting.The example of relevant this type of device in United States Patent (USP) 5,551, in 320 and 533,426 liang of cases, all has illustrated.It's a pity that these install when the fixator head does not have palp side, promptly just as discommodity.

Another prior art withdraw from device, utilize one have a pair of with the unidirectional fixer head on a pair of tip accept the instrument at " tip " that pit is meshed.This class is installed on United States Patent (USP) 5,450, describes in detail to some extent in 776 cases, and this patent had been authorized the applicant already.This device comprises that more one has the axle collar of non-well-balanced radial jag, in order to keep a firm hand on the circumferential edge of fixator head.The reciprocation of pit and collar clamp head is joined at this tip, makes to put on this fixator and withdraw from any revolving force on the instrument, obtains amplification effect to necessary " foothold ".But this kind device only limits to withdraw from through custom-designed fixator.When meeting with class such as above-mentioned existing fixed device, the function of this device is promptly difficult fully up to expectations.

Speech aspect skill, need really a kind of inexpensive, install fixator removal tool efficiently, in radially relative two quadrants, have flat part and round end or projection unidirectional fixer partly in order to withdraw from head.This removal tool is the occasion of countersunk at fixator, also must convenient dismounting.

One of the object of the invention is for providing a kind of in order to withdraw from the device of the unidirectional fixer of being with the circular arc head, and it can overcome the shortcoming of many prior arts.

No matter main purpose of the present invention serves as that install or the unidirectional fixer of immersing oneself on the surface for a kind of device is provided to remove.One of this device characteristic is, to be positioned at two protuberances of its axostylus axostyle end, with corresponding two protuberances engagement on the fixator.One of this device advantage is, mat connects an existing throw to this device, and an existing unidirectional round end fixator can stand to give easily and split out.

Another object of the present invention is provides a kind of axle collar, to mesh with single fixator one peripheral portions.A characteristic of the present invention is to have a plurality of rib ridges to be made in the inboard of this axle collar, to contact with fixator head generation entity.Another characteristic of the present invention is, the axostylus axostyle that contains two protuberances this axle collar of can sliding type packing into.One advantage of this axle collar is that two protuberances of assisting axostylus axostyle are dismountable no matter for installing or the unidirectional fixer of immersing oneself on the surface.Another advantage of this axle collar is, needn't be the fixator that install on dismountable surface with two protuberances of axostylus axostyle.

Another object of the present invention provides a kind of axle collar, can be in order to remove the existing fixed device that head has circular periphery.One characteristic of this invention is that the axostylus axostyle and the axle collar are combined into one, and have axostylus axostyle and become parallel but misaligned form with two longitudinal axis of the axle collar.The advantage of this device is, has the revolving force of larger amt to concentrate on the less part of fixator head periphery, therefore can remove the fixator that head has ringed perimeter easily.

In a word, the present invention proposes a kind of instrument of removing unidirectional fixer, and it comprises: an axostylus axostyle; One axle collar, this axle collar are suitable for this handle of suit; One device, in order to the head of fit unidirectional fixer, this head socket unit, comprise a plurality of planar walls, all planar walls all roughly with the longitudinal axis extends parallel of this axle collar, these walls form most rib ridges, are used for becoming with the peripheral portions of this unidirectional fixer head the detachable engagement; One withdraws from device, is used to withdraw from this unidirectional fixer, yet one of this rib ridge contacts with one of unidirectional fixer head peripheral portions generation entity at least.

The present invention also proposes a kind of device of removing the fixator of band circular arc head thread, comprising: a device, be close to cover should fixture head portion; In this top socket unit, form the device of most rib ridges; One device in order to the some engagement that has a rib ridge and this fixator head periphery at least; Thereby and one when rib ridge and this fixator head peripheral portions mesh, rotate the device of withdrawing from that this fixator is withdrawn from this threaded fastener in order to brute force.

The present invention also provides a kind of device of withdrawing from that is used to the fixator of circular arc head, and it comprises: an axostylus axostyle; One in order to be positioned this axostylus axostyle in radially relative two flat upper surface of fixator head device partly; One in order to the device with this axostylus axostyle and this fixing axial alignment; One device in order to this axostylus axostyle and this fixture head radially relative two protruding end faces partly are meshed; And thereby one be sitting at this axostylus axostyle powerful device of withdrawing from this threaded fastener of this radially relative two protruding end face on partly in order to brute force rotation.

Describe the present invention below in conjunction with accompanying drawing

Fig. 1 is for removing the front perspective view of unidirectional fixer with instrument one of according to the present invention.

Fig. 2 is the cutaway view of the axle collar that 2-2 gets along the line in Fig. 1.

Fig. 3 is the lateral elevational view that can use an existing fixed device of instrument dismounting shown in Figure 1.

Fig. 4 is the top view of the fixator of Fig. 3.

Fig. 5 be an axostylus axostyle interted an axostylus axostyle and with an existing side sectional view of immersing oneself in unidirectional fixer engagement.

Fig. 6 is the side sectional view of this axostylus axostyle and the axle collar among Fig. 2, but this is immersed oneself in fixator and partly withdrew from already.

Fig. 7 for 7-7 get along the line among Fig. 1 according to the bottom surface front view of the axle collar of the present invention.

The end face profile that Fig. 8 is got for instrument shown in Figure 5 8-8 along the line.

The sectional top plan view that Fig. 9 is got for instrument shown in Figure 5 9-9 along the line.

Figure 10 is an end face front view, shows the situation according to the axle collar of the present invention and the peripheral engagement of existing unidirectional fixer institute's tool oval head.

Figure 11 is the side surface part view that one of instrument shown in Figure 1 substitutes concrete example.

Figure 12 is the side cross-section front view of the alternative designs according to substituting instantiation of the present invention shown in Figure 11.

Figure 13 cuts open the figure front view for another substituting instantiation of instrument shown in Figure 1.

In above-mentioned description of drawings, especially among Fig. 1,2 and 3, with reference to the device or the instrument of digital 10 general references one in order to remove existing unidirectional fixer 12.This fixator 12 can be a threaded screw pattern, has a head 13 (Fig. 3) that is roughly annular, its have radially relative two flat, be facial part 14 on the crown and radially relative facial part 16 in the crown that is convex surface on plane substantially.

These utensil 10 usefulness rigid materials are made, and comprise an axostylus axostyle 20 and the axle collar 22, and latter's mat passage 24 is sleeved on this axostylus axostyle 20 removably.For the purpose of the operation of the typical throw of convenient use, this axostylus axostyle 20 can be designed to from first or holding end 26 sights, as an existing burr-drill that is roughly hexagonal configuration.This hexagonal configuration is to make six facial plane walls 25 to become on the surface of axostylus axostyle 20, and the longitudinal size of each wall is all very greater than lateral dimensions.This first or holding end 26 still comprise a groove 28 that is provided with around circumference, be used for removal suit one rotary activated tool easily.This axostylus axostyle 20 more comprises second or fixator end of engagement 30, and the latter can place two end face of head 13 of fixator 12 partly on 14.

The end of engagement 30 of this axostylus axostyle comprises two radially relatively and the protuberance 36 that is connected, and when seeing it from the end of engagement of axostylus axostyle 20, each protuberance is the configuration of general square shape or rhombus.This protuberance 36 has a flat wall 38, and this flat wall 38 is right after fixator 12 flat parts 14 and places.This protuberance 36 is by in these axostylus axostyle two relative edge's walls 25 end of engagements 30 places, form with machinery or the molded two arches depression 40 that makes.The shape that this depression 40 has can partly 41 contact it fully with protruding partly 16 the body of rod of fixture head 13.Making between depression 40 and the fixture head 13 stem bodys parts has quite a large amount of contacting, and when abundant revolving force added on the holding end 26 of all axostylus axostyles 20, promptly tolerable axostylus axostyle 20 was withdrawn from fixator 12.

Though, this axostylus axostyle 20 can be competent at the work of withdrawing from fixator 12, and no matter this fixator is installed or immersed oneself in type (as shown in Fig. 5 and 6) for flushing, yet, the flat wall 38 of protuberance 36 contacts many more with the flat part of fixator 12, it is more little then to withdraw from the required revolving force of fixator 12.More detailed speech it, when the longitudinal axis of axostylus axostyle 20 alignd in line with the longitudinal axis of fixator 12, this axostylus axostyle can get the operation of peak efficiency.When fixator 12 was withdrawn from operation, this axostylus axostyle 20 had " rocking " or moves apart tendency with fixator 12 axial alignment positions.When withdrawing from the fixator 12 that flushes installation or immerse oneself in, it is stable with this axostylus axostyle 20 to use the axle collar 22, and above-mentioned phenomenon can be eliminated.

Now just Fig. 5 and 8 says that the axle collar 22 has cylindrical exterior wall 42, one crown walls 44 mat passages 24 and is sleeved on the axostylus axostyle 20, and an end wall 46 comprises a retainer recess 48, is used for when withdrawing to admit fixator 12.

The shape of this recess 48 be by multiaspect planar walls 50 and etc. number cambered surface wall 52 (see figure 7)s constituted, these both all with the longitudinal axis extends parallel of the axle collar 22.As preferably, six planar walls and six cambered surface walls are to put around the inner rim wall paper of this recess.This recess 48 comprises a cap portion 54, and it is connected with passage 24, therefore can allow axostylus axostyle 20 vertically to be inserted through the whole axle collar 22.

The axle collar 22 comprises the zone of defining an aperture 56, has outside truncated cone part 58 and one an inside cylindrical shape screw thread part 60 is arranged, and with the hold-down screw 62 of can removing stage makeup and costume, the latter can be rotated with spanner pod 64.This hold-down screw can be torqued-up to axostylus axostyle 20 engagements powerful and that inserted, to fix the position of this axle collar 22 with respect to this axostylus axostyle surface y direction.Screwing of this hold-down screw is to use existing Alan (Allen) spanner (or square hole screw spanner) with standard hex shape of cross section.This Alan's spanner can be inserted in the spanner pod 64.This pod 64 has the hexagonal shape of cross section, a little hexagonal cross section greater than Alan's spanner of its area.

The arrangement of this hold-down screw, make axostylus axostyle 20 relatively the axle collar 22 mix countless positions.Saying it for example, is the occasion that flushes installation in fixator.This axostylus axostyle is adjustable to the below wall 46 of the terminal end surface 38 that makes protuberance 36 and the axle collar with extending or isoplanar positions.In other words, immerse oneself in the occasion of fixator when needs touch and withdraw from, this axostylus axostyle is adjustable to and protrudes in the axle collar and rely on outside the plane that edge or end wall 46 become.

With regard to Fig. 1,2 and 9 speeches, the planar walls 50 of retainer recess 48 is and is roughly a longitudinal size very greater than the rectangle of lateral dimension.The direction of this six planar walls, be arranged to first horizontal edge 66 that makes each wall perpendicular to one with the tangent straight lines of fixture head 13 peripheries.This horizontal edge 66 stretches a radial distance to be enough to first longitudinal edge 68 of each planar walls 50 is placed and can contact with 13 one-tenth entities of periphery of fixture head.The size of this first longitudinal edge 68 is when withdrawing from whole fixator 12, be enough to keep entity with a peripheral portions of fixture head 13 and contact.The size of each longitudinal edge 68 is made intersecting with the cap portion 54 of retainer recess 48, thereby it is consistent with the arc of cap portion 54 associated to form one second horizontal edge, and second longitudinal edge 72 of formation planar walls 50, its size a little less than first longitudinal edge 68.

Each six cambered surface wall 52, vertically extend to the cap portion 54 of retainer recess 48 from the end of the axle collar 22 wall 46, and laterally, when (see figure 7), from second longitudinal edge 72 of an adjacent flat wall 50, extend to first longitudinal edge 68 of the second adjacent flat wall 50 clockwise from wall 46 sights of the end of the axle collar 22.When the end-view of getting this axle collar 22 from end wall 46, show that then arc wall 52 is the acute angle shapes that constituted than minor face 74 and larger skirt 76 a little by one first.Corresponding to the cambered surface wall on long limit 76 partly, engages with first longitudinal edge 68 of planar walls 50, formation sharp edges ridge, its most finally fixator 12 when a works is withdrawn from, keep a firm hand on the peripheral portions of fixator 12.Corresponding to little cambered surface wall 52 parts of minor face 74, then can hold big more curved cambered surface wall 52 parts of work corresponding to length limit 76.

This gradually curved arc face wall 52 partly allow that the axle collar 22 can rotate in the time of engagement one fixture head 13, this rotation is allowed in being counter-clockwise direction from wall 46 sight of the end of the axle collar 22; Yet,, in conjunction with vertical rib ridge that cambered surface wall 52 is become, sting the into peripheral portions of fixture head 13, thereby withdraw from fixator 12 by first longitudinal edge 68 of planar walls 50 if this axle collar in the time of engagement one fixture head 13, is to do the clockwise direction rotation.

During operation, two protuberances 36 relatively radially with the end of engagement 30 of an axostylus axostyle 20 cooperate with radially relative two flat parts 14 that screwed in the existing unidirectional fixer head 13 in the works.If this fixator 12 is (as shown in Figure 5) of immersing oneself in to enter this works, this axostylus axostyle can be used for withdrawing from fixator 12 separately to the position of knowing clearly and showing just like Fig. 6.

In case fixator 12 has reached Fig. 6 position, this axostylus axostyle can be united the axle collar 22 and be used (and mat hold-down screw 62 is fixed to the axle collar) together so that fixture head 13 puts in to axle collar retainer recess 48.At this moment, the end wall 46 of the axle collar 22 be with fixator 12 withdraw from from the works surface engage.The effect of this axle collar 22 is, in order to keeping axially aligning of axostylus axostyle 20 and fixator 12 two axial lines, and mat be parallel to the axle collar 20 longitudinal axis and six vertical rib ridges 68 of stretching with extracting fixture head 13.The clockwise direction of observing when first end 26 of this axostylus axostyle 20 certainly, when the combination of the axostylus axostyle and the axle collar is rotated, this axostylus axostyle and fixedly the axle collar can make fixator 12 recession easily, until the cap portion 54 of fixture head arrival recess 48, so far this fixator shifts out fully.

Though the peripheral portions that present instantiation utilizes six roots of sensation rib ridge 68 to keep a firm hand on fixture head 13, the rib ridge that can utilize more or lesser amt in fact is to withdraw from fixator 12.But use six roots of sensation rib ridge 78, can make the shape of recess 48 similar to existing sleeve or spanner with standardization hexagonal configuration.

Figure 11 is for expressing the side surface part view of an alternative instantiation 110 that installs according to the present invention.The axostylus axostyle 112 and the axle collar 114 have given integration and making and have become an individual construction thing.Passage 24 and hold-down screw 62 have given abolishment, but the end wall 46 of the axle collar and retainer recess 48, and plane and cambered surface wall 50 and 52, all possess as identical configuration of former detailed description and vertical rib ridge 68.

This device 110 be used for when fixator is installed for flushing (with immerse oneself in the fixator contrast, see Fig. 6) on the surface of works, withdraw from fixator 12.More accurate speech it, at this moment this fixture head 13 is exposed to outer fully and can be grasped by rib ridge 68.One whirligig is fixed in the hexagonal configuration terminal part 116 of axostylus axostyle 112, and provides at last to remove and get the required revolving force of fixator 12.Because the intrinsic shape of existing unidirectional fixer head, this replacement device 110 has the ability to withdraw from fixator 12, and need not as the aforementioned axostylus axostyle 20 with 36 assistance of two protuberances.

One alternate design 110a of the instantiation 110 of integral manufacturing expresses in Figure 12.The axostylus axostyle 112a of this alternate design 110a has a longitudinal axis 118, and this longitudinal axis 118 is unjustified but be parallel to the longitudinal axis 120 of axle collar 114a.When axostylus axostyle 112a being bonded to axle collar 114a and going up, axostylus axostyle 112a moves to one " off-centre " position, causes when a whirligig drive shaft rod 112a, has strength greatly to act on the sub-fraction of axle collar 114a periphery and on the immediate rib ridge 68.So corresponding increasing " stings " power, act on the some of fixture head 13 peripheries that contact as entity with indivedual rib ridges 68, accept the strength that increases, thereby axle collar 114a is got can keep a firm hand on fixator 12 and withdraw from from axle collar 114a.Be somebody's turn to do the arrangement of " off-centre " axostylus axostyle, also can be used in all axostylus axostyles is the configuration of slidably being accepted (as shown in Figure 1) by the axle collar.

Unexpected surprised discovery of inventor is used for standard " sand removal of the rolling " program of " processing " metal, can not be applied to the making of the axle collar 22.Otherwise favourable " stinging " advanced the sharp edges ridge of fixture head and will be eliminated, cause the beneficial shape difficulty of dismounting action.Therefore, would rather the axle collar and axostylus axostyle only do heat treatment.

Figure 13 represents that according to the present invention one also is the side cross-section front view of another instantiation of device shown in Figure 1.This device 210 comprises that an aforementioned axostylus axostyle of carefully stating 20 reaches once the axle collar of revising 212.This axle collar 212 comprises a Lower Half 214, compares with preceding the axle collar 22 same area of carefully stating, and contains smooth inner surface.This axle collar 212 comprises a first half 216, is integral with Lower Half 214 to be connected.There is the straight longitudinal axis of alignment the upper and lower half 216 and 214 of axostylus axostyle 20.This first half 216 comprises the cavity 218 of adorning a spring 220 in one, and it has the clip 222 that a upper end 221 and is fixed on this axostylus axostyle 20 to engage, and by this axostylus axostyle 20 is fixed on the axle collar 212.This cavity is roughly cylindrical shape, and its diameter is a bit larger tham the lateral dimension of being located at the depression 224 in the Lower Half 214, thereby forms that wall 226 engages with spring 220 lower ends 228.This first half 216 more comprises a depression 217, its tolerable axostylus axostyle 20, with regard to y direction by this axle collar 212 insert, until the lower end 230 of axostylus axostyle be located in comparison near and be parallel to the position of the baseplane wall 232 of the axle collar 212.

In the operation, this device 210 is to place on the unidirectional fixer 12, makes the surperficial fixing holder head 13 of depression 224 cover unification, and 232 on the end wall of the axle collar 212 and fixator 12 accompanying works contact, and the bottom 230 of axostylus axostyle 20 is near fixator 13.One throw system is consolidated on the axostylus axostyle 20 holds 234.This throw is strong push shaft bar 20 downwards, thereby compresses spring 220 touches fixator 12 until the end of this axostylus axostyle 20 wall 230 flat part 14.So throw has given axostylus axostyle until fixator 12 according to counter rotation and having withdrawn from, and so far removes throw.At this moment, the upper end 221 powerful clips 222 with back of the body crown walls 236 in the axle collar 212 first halves 216 of spring 220 engage, and force axostylus axostyle 20 to be back to position originally in this way.This axostylus axostyle 20 then moves apart this automatically and has given the fixator of withdrawing from, and fixator 12 then still stays within the axle collar 212 Lower Halves 214.

The inventor is unexpected surprised to be found, not like surface within the above-mentioned axle collar, the Lower Half 214 of this axle collar 212 is for obtaining to withdraw from the required abundant torsion of fixator, needn't have to comprise planar walls and the cambered surface wall peripheral interior wall with the fixture head periphery of nipping.Yet the alternative instantiation of the smooth inner periphery surface of tool can provide the fixator that fills part to insert and remove torsion completely, when the longitudinal axis and the longitudinal axis of the axle collar 212 of axostylus axostyle 234 do not become coaxial in, especially true.Though preceding described instantiation is to utilize an axostylus axostyle as the interface thing between the axle collar and a whirligig; Also can utilize an engagement protrusion, from a ratchet stretch out and with insertion be positioned at the depression of the axle collar 22 end face walls 44 central authorities, add the combination of sleeve to set up a ratchet, in order to withdraw from an existing as the aforementioned unidirectional fixer 12.With regard to latter's example speech, a fixator removal tool is overmolded to engagement protrusion global formation on the axle collar of self, and the user of service obviously can be provided extra facility.

Claims (21)

1, a kind of instrument in order to the dismounting unidirectional fixer is characterized in that, comprising:

A) axostylus axostyle;

B) axle collar is suitable for this axostylus axostyle of suit;

C) device, in order to the head of cover unification unidirectional fixer, this device is attached on this axle collar;

D) this socket unit comprises a plurality of planar walls, the longitudinal axis extends parallel of they and this axle collar, and these planar walls form a plurality of rib ridges, are used for partly constituting the detachable engagement with the periphery of this unidirectional fixer head; And

E) one withdraw from device, be used for when at least one this rib ridge contacts with one of this unidirectional fixer head peripheral portions generation entity, withdrawing from this unidirectional fixer.

According to the instrument of claim 1, it is characterized in that 2, this axostylus axostyle comprises in order to the exterior wall of keeping a firm hand on described axostylus axostyle partly rotating the device of this axostylus axostyle, thereby withdraws from this unidirectional fixer.

According to the instrument of claim 2, it is characterized in that 3, this is kept a firm hand on device and comprises a plurality of planes exterior wall, the longitudinal axis that these plane exterior walls are parallel to this axostylus axostyle stretches.

According to the instrument of claim 3, it is characterized in that 4, this all planes exterior wall is to be a hexagonal configuration from the terminal sight of this axostylus axostyle.

According to the instrument of claim 1, it is characterized in that 5, this axle collar comprises a cylindrical circular exterior wall.

According to the instrument of claim 1, it is characterized in that 6, the longitudinal axis that this rib ridge is parallel to this axle collar stretches, this rib ridge forms being connected from one first planar walls and one second cambered surface wall.

7, according to the instrument of claim 1, it is characterized in that, this is withdrawn from device and comprises this first planar walls direction is arranged to perpendicular to one of this fixture head cooperation peripheral portions, and the size of this first planar walls made horizontal extension, to engage with this cooperation peripheral portions of this fixator head, by this, when the whole axle collar that is connected of rotation this axostylus axostyle and this, unidirectional fixer is withdrawn from by force.

According to the instrument of claim 1, it is characterized in that 8, this is withdrawn from device and comprises in order to executing spinning force is concentrated on the strength centralised arrangement on this axle collar one little peripheral portions.

9, instrument according to Claim 8 is characterized in that, this strength centralised arrangement comprises that the longitudinal axis of this axostylus axostyle leaves the parallel longitudinal axes line of this ring and the structure that is offset.

10, a kind of device that is used to remove the threaded fastener of being with the circular arc head is characterized in that, comprising:

A) be close to cover should the head socket unit of fixture head portion and the device that in this head socket unit, forms a plurality of rib ridges;

B) geared assembly in order to utilize at least one this rib ridge to be meshed with the peripheral portions of this fixator head; And

C) when this rib ridge and the engagement of this fixator head peripheral portions, thereby rotate the device of withdrawing from that this fixator is withdrawn from this threaded fastener in order to brute force.

According to the instrument of claim 10, it is characterized in that 11, this head socket unit comprises an axle collar, tool one depression in it.

According to the instrument of claim 10, it is characterized in that 12, this rib ridged apparatus for converting comprises that first planar walls connects the structure of the second cambered surface wall.

According to the instrument of claim 10, it is characterized in that 13, this geared assembly comprises that the size with this second planar walls makes extending transversely, so that its structure that is connected with one of this fixator head combination periphery.

According to the instrument of claim 10, it is characterized in that 14, this brute force whirligig comprises that the direction with this first planar walls is arranged to this structure in conjunction with peripheral portions perpendicular to this fixator head.

15, a kind of device of withdrawing from that is used to the fixator of circular arc head is characterized in that, comprising:

A) axostylus axostyle;

B) one in order to be positioned this axostylus axostyle radially relative two flat upper surface of one fixator head positioner partly;

C) in order to aligning apparatus with the axial alignment of this axostylus axostyle and this fixator;

D) geared assembly in order to this axostylus axostyle and these fixator head radially relative two protruding end faces partly are meshed; And

E) thus be positioned at this axostylus axostyle powerful powerful whirligig of withdrawing from this threaded fastener of this radially relative two protruding end face on partly in order to brute force rotation.

According to the instrument of claim 15, it is characterized in that 16, this positioner comprises an axostylus axostyle end of engagement, it has two radially relative positioning saliences.

According to the instrument of claim 16, it is characterized in that 17, this two positioning salience is seen it from this axostylus axostyle end of engagement, all is square.

According to the instrument of claim 15, it is characterized in that 18, this axial alignment device comprises an axle collar, it has consistent break-through road, is used for this axostylus axostyle of suit, and the longitudinal axis of this passage and the longitudinal axis of this fixator align.

According to the instrument of claim 18, it is characterized in that 19, this passage departs from mutually with the longitudinal axis of the axle collar.

According to the instrument of claim 15, it is characterized in that 20, this geared assembly comprises the end of engagement of this axostylus axostyle, this end of engagement has two radially relative concave surfaces and is absorbed in the place, in order to cover should the radially protruding relatively end face of this of fixator partly.

According to the instrument of claim 15, it is characterized in that 21, this brute force whirligig comprises the drive end of this axostylus axostyle and can be sleeved on one on this axostylus axostyle in order to withdraw from the throw of this fixator by demountable mode.

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