CN1065454C

CN1065454C - Discharge appts for flowable media

Info

Publication number: CN1065454C
Application number: CN96191847A
Authority: CN
Inventors: K·H·胡赫斯; S·里斯彻
Original assignee: Ing Erich Pfeiffer GmbH
Current assignee: Aptar Radolfzell GmbH
Priority date: 1995-02-09
Filing date: 1996-02-03
Publication date: 2001-05-09
Anticipated expiration: 2016-02-03
Also published as: DE19700437A1; CN1173834A; KR100312887B1; ATE183412T1; DE69603835D1; KR19980702087A; DE29601047U1; DE19700437B4; DE69603835T2

Abstract

The present invention relates to a device for exhausting a certain quantity of measured liquid in one travel, such as a sprayer with single travel. The sprayer is provided with a safety seal, wherein the seal comprises a drive sleeve barrel (17) which is integrally connected with an outer shell of a container by a material bridge (19). The material bridge has a specified breakpoint. After sufficient acting force is applied to the drive sleeve barrel (17) and the material bridge is ruptured, a pump cylinder (27) is arranged in the drive sleeve barrel (17) and contains liquid (29). Pressure is applied to a piston (31) of the pump cylinder (27) in a way of opposing to a needle (42). The piston is punctured by the needle. A hermetical material bridge is arranged on a U-shaped ring, and the U-shaped ring covers an outer protrusion part of the shell body. A second safety seal which is used for the travel of the second part can be set into a form of a ring additionally arranged on the drive sleeve barrel (17).

Description

The tapping equipment that is used for flowable media

Field and the prior art used

The present invention relates to a kind of tapping equipment that is used for flowable media, it has the basic body and the pushing piston pump that are used for holding a media Containers, this pump has a pump piston that can move between starting position and pump stroke end position in a piston, this pump also has a pump chambers on the exhaust openings that is connected to this device by a discharge-channel, this pump chambers is formed by a pump cylinder, this pump cylinder has also formed media Containers, and comprises pump piston.

WO91/13689 shows a kind of tapping equipment of using at the partial journey single of being used for that is used for flowable media.

In the applicant's European patent 311863 (being United States Patent (USP) 4964069), a kind of like this tapping equipment has been described.This patent document discloses and claimed this pump cylinder and a kind of structure are made into the elastomeric stopper of hasp lock device form; its method of operation is before the discharging of a partial journey; the operator must apply a specific driving pressure; thereby after overcoming this force value, realize the discharging of liquid with certain minimum active force and minimum speed.

This structure has been guaranteed for example when making medium atomization, first constantly the pressure is enough to realize the purpose that atomizes, and guarantee pump shifted onto its end, promptly realize its whole stroke, and, in one or two stroke, the entire capacity of its media Containers is given off the cylinder body that this container forms pump simultaneously.This device of preparing dosage or batching once or twice is favourable for distributing medicine, at proportion scale, pollutes, and preserves or others, and medicine is strict especially.

The applicant's WO92/00812 also discloses the use of media Containers for single discharging stroke, and these containers, are punctured this plunger with a pin in order to use it by a plunger seal that is used as piston simultaneously.Media Containers is contained in the sleeve, and this sleeve has the protuberance of outside, and these protuberances match in the fastening mode of a kind of hasp with corresponding protuberance on the medial surface of the basic body of shelly.When using, before sliding on the surface that they engage, at first must overcome stiction, thereby must overcome a certain force value at described protuberance.

Problem and solution

The objective of the invention is to further develop a kind of like this tapping equipment,, and avoided the pollution that caused or the problem on the proportion scale particularly in order to prevent accidental repeated use or to promote not exclusively.

In one embodiment of the invention, at least one pump part that can move and be connected at least one material bridge between the housing parts on the basic body and can form according to of the present invention the obvious shell of using sign arranged with pump cylinder.This material bridge is preferably formed by the structure with as a whole of housing parts and pump part.

Therefore, produced a predetermined breaking between the parts that can move mutually of tapping equipment, it is that the liquid that is full of in the media Containers is not opened and was not used trimscript will really that these parts were not touched.The user can for example determine this point with method of optics, or rotates driver part a little and determine this point.For inspection is become easily, can be provided with the cutouts of window, or can make the some parts of pump by material transparent.Also can adopt the plastics of variable color under the situation of breaking strain.Also can on moveable portion and housing, load onto mark.Be preferably in to keep and can partly hold and form material bridge as between a drive sleeve of the pump cylinder of media Containers and the part that is provided with a base shell the inside partly that drives shoulder.Drive the supporting member of shoulder as two fingers, thumb is pressed on the drive sleeve.In order to cut off this material part or this material partly to be ruptured, can apply a suitable active force.Because the active force that applies has simultaneously produced a suitable activation force, is used for driving reliably this pump.

For example can be arranged on material bridge on the excircle of drive sleeve, and between a drive sleeve and a ring around described sleeve, and then lean on hasp that this ring is fixed on the surface portion, that is, be fixed on the housing.This makes to separate with housing and makes drive sleeve and become possibility.Yet, also can on housing, be shaped material bridge out, can be fixed on the moveable part by engaging or certain alternate manner be fixed to circular securing member on the surface, be fixed on the pump cylinder or be fixed on the drive sleeve.

According to characteristics of the present invention, be shaped into parts on the pump parts housing by surrounded a protuberance by material bridge.In this case, these parts cover the joint gap between these pump parts and the housing fully, not only provide between pump parts and the housing on a kind of optics and function on fusion, and prevented that repetitive operation from having the obvious possibility of using the joint of sign.Preferably should be, it be firm that hasp connects, and prevents to throw off, if make someone attempt pump cylinder is pulled out by housing, it is just with destroyed.Under these circumstances, material bridge and have obvious used the sign shell will rupture.

Especially preferably, these parts are a ring that has a L shaped cross section, and it comprises radially bottom part ring parts and an adjacent sleeve basically.The inside of this sleeve preferably is provided with a hasp profile.This hasp profile can match with a corresponding profile of shape on the protuberance of snap-action mode and this ring or ring section shape.

Can be by claim; description and diagram draw these and other characteristic; can in one embodiment of the invention and in other field, realize these other characteristics; individually and with the characteristics that draw of mode of combination; and; these other characteristics can represent superior can claimed individually structure, therefore, these structural requirements are protected.

Brief description of the drawings

In the accompanying drawings, in order to understand clearlyer, Fig. 1 to 5 shows original design of the present invention, in order that explain some basic characteristics that adopted in the present invention, that is:

Fig. 1 passes to have the obvious longitudinal sectional drawing of using a kind of tapping equipment of the shell that indicates is arranged;

Fig. 2 is the view of arrow II direction in Fig. 1;

Fig. 3 is the details of Fig. 2, but illustrates with section;

Fig. 4 is the profile of the line IV intercepting in Fig. 2;

Fig. 5 is passed in the part longitudinal sectional drawing that has an embodiment of a ring that is made into definite shape on the obvious shell of using sign;

After this Fig. 6 and 7 with reference to accompanying drawing has described a preferred embodiment of the present invention in more detail, wherein shows:

Fig. 6 is the longitudinal sectional drawing that passes another kind of preferred embodiment;

Fig. 7 is a top view embodiment illustrated in fig. 6;

Fig. 8 is the partial enlarged drawing of Fig. 6.

Description to embodiment

The tapping equipment 11 that is shown in Fig. 1 has a two-part basic body 12.It comprises a base shell part 13, and this part has the shape of a picture epaulet, has two and drives shoulder 14 and a sleeve that is connected thereto 15.Base shell partly is flat or flat avette, and in the plane of drawing its longest stretching, extension is arranged, and less in its horizontal size.The left and right sides of sleeve 15 in Fig. 1 is longer, and it roughly with parallel plane two sides of drawing on have a quilt to cut out part 16, these parts that cut out are opened wide to the bottom surface.

A drive sleeve 17 is injected on the base shell part 13, promptly becomes as a whole on the inboard below a joint 18 that is projected upwards by this part 13.Between base shell part 13 and drive sleeve 17 become one be connected by means of material bridge 19 and realize, as shown in Fig. 2 to 4.In this representational embodiment, three thin connection webs couple together the gap 20 between the inward flange ledge 22 of the inside of the outward flange of the upper flange 21 of drive sleeve 17 and joint 18, these webs are leg-of-mutton shape, their summit is formed on the web 22, thereby forms predetermined breaking.From the viewpoint of making, because they are the quite little recesses that just surpassed the size of common burr, so they can form on the surface that separates between the plastic components of two injection mouldings, on the one hand, they are formed in the volume inside 23 of sleeve 15, and on the other hand, they constitute the space in the joint 18.Therefore, three material bridge that distribute on circumference equably 19 are arranged in a plane, and this plane is formed by the inboard and the bottom surface that drive shoulder 14 on the one hand, and are formed by the top edge of flange 21 on the other hand.

Drive sleeve 17 has inner ribs 24, count from the bottom surface 25 of sleeve, their length be roughly this sleeve length 3/4.The bottom surface 26 of pump cylinder 27 also is supported on these ribs, and the shape of this cylinder body is roughly the sleeve that columniform bottom surface is closed, and it is made by glass, and a upper flange 28 is arranged.This sleeve is formed for the container and the pump cylinder of the medium 29 that is discharged simultaneously.Its inner circumferential surface has formed the piston travel 30 of a piston 31, and structure of piston is the form of the piston of rubber or similar elastomeric material.On the longitudinal cross-section, it is a H shape, it is the pipe of a heavy wall, the outer sleeve of this pipe forms the travel path of piston, the sealing web 32 at a center gets up the enclose inside of pipe in the horizontal, thereby formed the recess 33 that is connected on the sealing web 32 at top and bottom surface, these recesses can be general conical.

Piston boit 31 is positioned on the medium 29 of hermetic seal.Air can be filled with, also air can be do not filled.With little pressure pump cylinder is inserted in the top of drive sleeve, and makes pump cylinder cross 14 stretching, extensions of driving shoulder with its best part, by joint 18, and enter in the blank area 34, this blank area also can be made as an adapter.It is a finger portion, and it has a cylindrical basically or axle of taper a little, has a top spherical dome that stretches on the direction of pump shaft line 35.Be provided with exhaust openings 36 at the center of described dome, its form is the injection nozzle of a routine.Yet this exhaust openings also can be provided as some other form of export, for example, is used for carrying out the transmission according to dosage of liquid or starchy medium, and other shape maybe can be arranged, and makes discharging can adapt to the shape of any body openings better.Therefore, separate partly with base shell that to make blank area 34 also be favourable, by a snap fasteners 37, for example with being bonded in the opening and being provided with three protuberances of a barb-like head, fixed thereon blank area 34, and make this blank area be positioned at the center of joint 18.In order to prevent the disengagement of this blank area 34, can be made into the structure of snap fasteners from the form that locks.Protection sleeve 38 these blank areas of protection are avoided polluting.

In the inside of this blank area, a piston rod part 39 is arranged, it has the discharge-channel 40 of an inside, and it is inserted in the sleeve 41 that is shaped inwards on the upper end of blank area 34.For example by being inserted into or compressing into a perforate that is provided with corresponding support rib, a push rod 42 is inserted in the described piston rod part 39, the form of push rod is the draw point of the hollow of cutting away sideling of dipping down.

Except draw point 42, beyond the piston boit of being made by rubber type of material 31 and glass pump cylinder body/media Containers, all pump parts all are the working of plastics of injection moulding.

In the process of making the parts that center on base shell part 13 and drive sleeve 17, pump cylinder 27 is inserted in the jack 43 that forms in drive sleeve 17 by the top.Described cylinder body 27 comprises by piston boit 31 by the medium 29 of tight seal.

Then the erection joint part has been loaded onto piston rod part and push rod 42 in advance on this blank area, and this blank area is bonded in the base shell part, and fixing by snap fasteners 37.Like this, after loading onto protection sleeve 38, this tapping equipment just assembling finishes.In order to use it, after the user removes protection sleeve 38, this tapping equipment is placed between three fingers, two fingers are placed on the shoulder 14, and thumb is placed on the bottom surface 25 of drive sleeve 17.Thumb engage window-like into by in the cutouts 16, thereby suitable driving surplus is arranged.Floss hole 36 is pointed to corresponding point, and lean against and apply big pressure on the drive sleeve and make driving pressure be increased to such degree, to such an extent as to torn or sheared disconnected by material bridge 19 formed predetermined breakaway poings, then drive sleeve can move up with pump cylinder.Because the big pressure that applies previously, this process takes place with a high speed, and this has guaranteed that the discharging stroke carries out apace.Pump cylinder moves up facing to push rod 42, thereby the latter punctures the central web 32 of piston boit, but because the elasticity of piston boit material, this piston is resealed on its outer surface immediately.Medium is upwards discharged by discharge-channel 40 and exhaust openings 36 with the inner passage of the push rod of the pin by being made into a hollow only, and there with sent forth or correspondingly in proportion the mode of proportioning give off.The lower limb of piston rod part 39 can join on the upper surface of piston boit 31, contacts thereby produce a direct pressure with piston, piston is advanced downwards along piston travel 30, and medium is sent to exhaust openings.The length of pin should make it can not give prominence to the lower limb of crossing piston boit 31, thereby has guaranteed that very expensive in some cases medium can almost entirely discharge.

Like this, this tapping equipment provides the possibility of discharging responsive and expensive material in a kind of mode of planned strict dosage.The time have the obvious shell of using sign of having of material fracture by operation, can be in office whether when the marquis checks once used, and guarantee medium fully to be discharged with suitable driving pressure.The making of this device and assembling are simple, and can be applicable to different situations at an easy rate, for example, and by the shape of different adapters.After using, this unit of comprising pump cylinder 27 and drive sleeve becomes pine, if be ready, can extract this unit out in downward direction.Can remove the pump cylinder 27 that has pump plunger 31, thereby remainder can be selected to be made of plastics by one type material except little pin, can correspondingly dispose.

Fig. 5 shows the details of an embodiment with section longitudinally, and its middle shell 13 and blank area 34 are made into an integral body.Adopted identical label for identical parts, with reference to the description of front to described parts and their function.

On the drive sleeve 17 of its storage container 27, on its lateral surface, be provided with a securing member 60, its form is a ring that has the full circle week in a L shaped cross section.Several material bridge 19 are connected to it on the drive sleeve 17, and the structure of these material bridge and size are made into makes them rupture under the effect of driving pressure, and the result makes ring separate with drive sleeve.Securing member 60, drive sleeve 17 and material bridge 19 all become a single piece by plastic injection-moulded.

A kind of hasp connector 61 is fixed to this securing member 60 on the shell 13.This securing member is got the center with its axial leg on the inboard of blank area 34, be locked in the recess that drives the transition portion between shoulder 14 and the blank area 34 and point to outer leg.

In assembling process, drive sleeve is introduced with the container 27 that forms pump cylinder.A kind of joint of assembly 61, and do not make by the formed danger that has the obvious shell of using sign to be damaged of material bridge 19.Yet, the sleeve if the user moves up, material bridge 19 fractures, and drive sleeve can realize the stroke of pump in the manner described before with pump cylinder/container 27.On the one hand, (between the material bridge of fracture) guiding drive sleeve 17 in the securing member 60 of circle, and on the other hand, on the internal web 62 of blank area 34, guide drive sleeve.An external flange of container/pump cylinder 27 also is directed by this way, and this has prevented the inclination of this drive unit.Also can make the crack to the structure of material bridge 19, or connect by film.

Securing member 60 has the axial and radial clearance of some in locking connector 61.This make to have a mind to or by mistake makes drive sleeve 17 rotations and do not destroy the obvious shell of sign of using and become possibility.Yet the locking connector must be sufficiently strong, to such an extent as to when drive sleeve 17 when downward direction is extracted out, have the obvious shell that indicates of using to rupture.This has guaranteed undesirable operation can not occur to the content of the device of preparing burden in proportion.Like this, providing has the obvious shell of using sign, and it needs the activation force than ambassador's material damage, so that destroy the sealing of media Containers 27, this active force is than big at following active force that may need of situation of simple pin.Frictional force between guiding flange 28 and internal web 62 helps to have realized this point, and after having overcome static friction, these clips enter sliding mode, therefore discharges major part and is used for driving and overcomes the used activation force of other resistance.

Fig. 6 and 7 shows a preferred embodiment, and it has the 26S Proteasome Structure and Function characteristics identical with the embodiment of Fig. 5.Here, also adopted identical label, with reference to the description of front to these parts and their function for identical parts.

Material bridge 19 is connected to parts 60 on the drive sleeve 17, and these parts are a ring that has a L shaped cross section.Therefore, it has a bottom part ring 70, and this bottom part ring has material bridge 19 at its medial surface, and this bridge connects into an integral body to bottom part ring 70 and drive sleeve 17.A sleeve 71 is parallel with drive sleeve 17, and concentric with it.Be provided with a hasp profile 72 on the inner surface of sleeve 71, it can be for example constitutes (see amplify details) by the ring protuberance that barb is housed in Fig. 7 mid point line circle.

Parts 60 are covered with a housing protuberance 61, and this protuberance is an annular, and round the opening in shell 74 of centre, pump cylinder 27 and its drive sleeve 17 are included in this perforate.Protuberance 61 is stretched out downwards by shell 13.Protuberance 61 can be annular or tubulose, perhaps is shaped as several sections that are provided with circular pattern.At its lateral surface, an opposite profile 63 is arranged, be complementary with the hasp profile 72 of sleeve.

Its snap-action is configured such that in the process of installation unit, drive sleeve/pump cylinder 17, in 27 processes of putting in the shell perforate 74, by snap-action parts 60 are fixed on prominent 17 of shell, in 27 processes of putting in the shell perforate 74, by snap-action parts 60 are fixed on the protuberance 61 of shell, and cover the latter.The needed strength of hasp can not make material bridge quilt stress application excessively in the hasp process.Yet, if apply active force in the opposite direction, may cause drive sleeve 17 is extracted out downwards, the shape that has barb of

clasp

72,73 makes that material bridge 19 will be destroyed, uses thereby clearly show.

Although in the embodiment of Fig. 5, shell has an outer casing sleeve that stretches out 15 downwards, the driving shoulder 14 that Fig. 6 and 7 embodiment are provided with is the shape of flat shell protuberance (see figure 7), and is outstanding in the horizontal, surpasses the major part 34 of shell on relative both direction out and away.It is roughly avette.It makes it possible to catch safely this device between two fingers, simultaneously thumb by on the bottom surface 25 that is pressed in drive sleeve.By seeing rib 75 among Fig. 7, the shape of these ribs makes and can catch well, and makes intensity reinforcement, particularly the surrounding edge rib of giving prominence to upward 77 that intensity is strengthened.

Thus, will save material, and not damage stability, stability has very big importance for disposable product.The lower surface that drives shoulder 14 can also be used to loading onto mark, for example lot number.Drive sleeve 17 also can be used to do label or other visible mark.

On the excircle of drive sleeve 17, be provided with one second annular element 76 apart from a place 63 1 of lower surfaces that leaves parts 70.Also be molded as a single piece with drive sleeve by material bridge 19b as parts 70, the second parts 76, these material bridge can be the same class material bridge as shown in Fig. 2 to 4.Yet they are bigger than the intensity of the material bridge of parts 60.

This embodiment provides a kind of tapping equipment of two strokes, that is, a kind of discharging or injection apparatus, it can discharge the discharge capacity of two accurate proportionings, and one after another.Annular element 76 stops after making and operating in the first's stroke that is equivalent to apart from a.This end of stroke in this section, operation forces (buffer brakes of liquid etc.) and be used for making the active force of material bridge 19 fractures to be added in together.Therefore, the user can not cross second ring unintentionally.

After stopping specifically, be generally half of whole stroke, the user can be used in the method that increases by a pressure on the pump parts and also make material bridge 19b fracture.When making material bridge 19b fracture, annular element 76 is pressing the contact surface 63 of parts 60.

After first's stroke of this two stroke tapping equipments, container or pump cylinder 26 are opened by the pin 36 of hollow.Yet, for the purposes of nose spray medicine, this embodiment for continuously but highly beneficial with identical ratio the situation that a kind of medicine applies two nostrils into.Thereby second stroke also prevents usefulness again.

Should be noted that the embodiment of Fig. 6 provides a kind of uncomplicated tapping equipment that is closed, this device is easy to use and pack.

Claims

1. tapping equipment that is used for flowable media, it comprises a basic body (13), holds a pump unit at least in part, this pump unit has:

The pump chambers that can be connected to an exhaust openings (36) by a discharge-channel (40), this pump chambers is by a pump cylinder (27) and a pump piston (31) be combined into; Pump cylinder (27) forms the container of medium; Pump piston (31) is directed and can moves in pump cylinder (27);

This pump cylinder (27) is at least partially contained within the drive sleeve (17);

It is characterized in that,

One has the obvious shell of using sign, and it can be destroyed by an activation force,

Between pump unit and annular fastener (60), comprise the material bridge (19) that at least one can be ruptured,

Securing member (60) becomes one by at least one material bridge (19) and pump unit; By an outside protuberance (61) described securing member is assembled on the basic body (13) around basic body (13),

In the outside of protuberance (61) with in the inside of securing member (60) clasp (72,73) of working in coordination is set.

2. according to the described tapping equipment of claim 1, it is characterized in that securing member (60) is a ring that has L shaped cross section, it comprises the loop section (70) and a columniform basically sleeve part (71) of a bottom.

3. according to the described tapping equipment of claim 2, on the medial surface of sleeve part (71), it also comprises a hasp profile (72), and it matches with the corresponding hasp profile of the shape on the lateral surface of protuberance (61) (73).

4. according to any one the described tapping equipment in the claim 1 to 3, it is characterized in that, clasp (72,73) be barb-like, the direction ratio of entering at hasp has less fixation power in direction in contrast, on this opposite direction, the fixation force rate makes the active force of at least one material bridge (19) fracture want big.

5. according to any one the described tapping equipment in the claim 1 to 3, it is characterized in that the internal web (62) of basic body (13) forms a guiding piece for the pump part.

6. according to any one the described tapping equipment in the claim 1 to 3, it is characterized in that securing member (60) has a composition surface for an assembling tool, applies an active force, be used for making clasp (72,73) to be joined together.

7. according to any one the described tapping equipment in the claim 1 to 3, it is characterized in that at least one material bridge (19) is made into one with drive sleeve (17).

8. according to any one the described tapping equipment in the claim 1 to 3, it also comprises the several material bridge in a plane basically.

9. according to any one the described tapping equipment in the claim 1 to 3, it is characterized in that at least one material bridge (19) is made into the shape that is connected to a tip on the wall.

10. according to any one the described tapping equipment in the claim 1 to 3, it is characterized in that, be provided with a mark on the pump unit, it matches with mark on the basic body (13), and they move mutually in the process of driving pump.

11. according to any one the described tapping equipment in the claim 1 to 3, it is characterized in that, begin to discharge between the determined discharging starting position in position that the obvious shell of using sign is arranged and by medium, have one to determine that a sky walks the interval in path, described shell the partial fixing that is used for driving that can move relative to each other in last position.

12. a tapping equipment that is used for flowable media, it comprises a basic body (13), holds a pump unit at least in part, and this pump unit has:

The pump chambers that can be connected to an exhaust openings (36) by a discharge-channel (40), this pump chambers is by a pump cylinder (27) and a pump piston (31) be combined into; Pump cylinder (37) forms the container of medium; Pump piston (31) is directed and can moves in pump cylinder (27);

It is characterized in that,

One first and second has the obvious shell of using sign, they can be destroyed by an activation force, and they comprise one first and second parts (60,76), each parts between pump unit and basic body (13), have at least one material bridge that can rupture (19,19b);

First and second parts are kept apart, make first's stroke that the parts of winning (60) are allowed pump piston (31) after material bridge (19) fracture at it, described first stroke is limited by second parts (76);

Therefore, under the effect of an activation force that has strengthened after the fracture, pump piston (31) can carry out a second portion stroke in the material bridge (19b) of second parts (76).

13., it is characterized in that first parts (60) have an abutment surface according to the described tapping equipment of claim 12, second parts (76) are pressed against on this surface when first's stroke finishes.

14. a tapping equipment that is used for flowable media, it comprises a basic body (13), holds a pump unit at least in part, and this pump unit has:

The pump chambers that can be connected to an exhaust openings (36) by a discharge-channel (40), this pump chambers is by a pump cylinder (27) and a pump piston (31) be combined into; Pump cylinder (27) forms the container of a medium, and is included at least in part in the plastics drive sleeve (17);

Guiding pump piston (31) movably in pump cylinder (27);

Basic body (13) has a columniform basically part (34) that is positioned at the center, an injection nozzle (36) is arranged on its top, driving is arranged in its lower end and grasp shoulder (14), its form is the protuberance that generally flat footpath makes progress, and the size on the direction more vertical than direction therewith of the size on the both direction respect to one another is big significantly;

It is characterized in that,

One has the obvious shell of using sign, and it can be destroyed by an activation force;

Comprise the material bridge (19) that at least one can be ruptured, itself and a securing member (60) and drive sleeve (17) are as a whole, securing member (60) is a ring round an external shell protuberance (61), these protuberances stretch out below described extracting shoulder (14) and described drive sleeve (17), and this sleeve stretches out in the centre by also crossing described securing member (60) out and away.