SI8810320A8

SI8810320A8 - Nipple with special element

Info

Publication number: SI8810320A8
Application number: SI8810320A
Authority: SI
Inventors: Artur Fischer
Original assignee: Fischer Artur Werke Gmbh
Priority date: 1987-02-21
Filing date: 1988-02-18
Publication date: 1996-04-30
Also published as: HRP930546A2

Description

Izum se nanaša na moznik z razporno tulko po zvrsti glavnega zahtevka.The invention relates to a spacer sleeve according to the type of the main claim.

Moznik zgoraj omenjene vrste se sidra na način, da se razporno telo potegne v razporno tulko, pri čemer se razporna tulka opira na ležajnem elementu, ki ga tvori npr. distančna puša. Le-ta leži pri tem na protiležaju vijaka, ki ga tvori glava vijaka ali na njem ležeča podložna plošča. Pri uporabi distančne puše kot ležajni element je med razporno pušo in distančno pušo potrebna dodatna plastična puša kot krčilno območje, da se zagotovi varno spenjanje moznika s predmetom, ki ga pritrjujemo.The dowel of the aforementioned type is anchored in such a way that the spacer body is pulled into the spacer sleeve, the spacer sleeve resting on a bearing element formed by e.g. spacer bushing. The latter lies on the counterbalance of the screw formed by the screw head or the support plate. When using the spacer sleeve as a bearing element, an additional plastic sleeve is required between the spacer sleeve and the spacer sleeve as a shrinkage area to ensure secure attachment of the dowel to the object being secured.

Znani so tudi drugi mozniki z razpirnimi tulkami, pri katerih razporna tulka pri uvleku razpornega telesa v izvrtino trdno zgrabi, ne da bi razporna puša nalegala na ležajnem elementu.Other dowels with expansion sleeves are also known in which the spacer sleeve firmly grabs into the bore without inserting the spacer sleeve against the bearing member.

Vstavitev tovrstnega moznika v vlečno območje sidrne osnove zahteva visoko sposobnost razpiranja, da bi se pri povečanju izvrtine zaradi tvorjenja odrgnin izognili zmanjšanju držalne vrednosti. S trenjem, ki po sidranju moznika deluje med razporno tulko in razpornim telesom, se lahko v zelo neugodnih primerih pri povečanju izvrtine s tvorjenjem odrgnin z na razporno telo prijemajočo obremenitvijo razporno tulko in s tem celoten moznik potegne iz izvrtine, ne da bi povečanje izvrtine izravnali z razpiranjem.Inserting this dowel into the trailing area of the anchor base requires a high opening ability to avoid a reduction in holding value when enlarging the bore due to the formation of abrasions. By friction acting after the anchorage of the dowel between the spacer sleeve and the spacer body, in very unfavorable cases, when the augmentation of the bore is increased, the spacer sleeve gripping load on the spacer body, thereby pulling the entire dowel from the bore without offsetting the bore by expanding.

Naloga izuma je sposobnost razpiranja uvodoma omenjenega moznika tako izboljšati, da bo sposoben izravnati povečanje izvrtine, ki se pojavi s tvorjenjem odrgnin, z zdrsom razpornega telesa v razporno tulko.It is an object of the invention to improve the opening of the aforementioned dowel so as to be able to compensate for the enlargement of the bore which occurs by the formation of abrasions by sliding the spacer body into the spacer sleeve.

Rešitev te naloge vsebujejo značilnosti podane v glavnem zahtevku. Pri vstavitvi moznika po izumu v predpripravijeno izvrtino v sidrno osnovo se vzmetni obroč stisne skupaj na premeru izvrtine, ki ustreza vsaj zunanjemu premeru razporne tulke. Za vstavitev moznika v izvrtino ni s tem potreben nikakršen dodaten napor. Po vstavitvi moznika se z vrtenjem vijaka premika razporno telo v osni smeri, razporno pušo za sidranje le-tega pa se potegne v izvrt,ino. Pri tem se lahko razporna tulka posredno ali neposredno opre na vzmetni obroč, kajti slednji je trdno pritrjen proti ostenju izvrtine. Pri razpiranju razporne tulke se vzmetni obroč lahko podpre tudi preko protiležaja na vijakovi glavi.The solution to this problem contains the characteristics given in the main claim. When inserting the dowel according to the invention into a pre-drilled hole in the anchor base, the spring ring is compressed together at a hole diameter corresponding to at least the outer diameter of the spacer sleeve. No additional effort is required to insert the dowel into the bore. After inserting the dowel, the spacer body moves in the axial direction by rotating the screw, and the spacer sleeve for anchoring it is pulled into the bore, ina. In this case, the spacer sleeve can be directly or indirectly resting on the spring ring, since the latter is firmly attached to the bore of the bore. When opening the spacer sleeve, the spring ring can also be supported by a counterweight on the screw head.

- 3 Če zaradi tvorjenja odrgnin pride do povečanja izvrtine, se lahko vzmetni obroč temu povečanju izvrtine prilagodi, pri čemer podpre razporno tulko proti osnemu gibanju. S tem se prisilno doseže, da na razporno telo delujoča obremenitev premaga trenje med razpornim telesom in razporno tulko, pri čemer povleče razporno telo v razporno tulko. S tako povezanim ojačanim razpiranjem razporne tulke se izravna povečanje izvrtine.- 3 If an increase in bore occurs due to the formation of abrasions, the spring ring can be adjusted to this increase in bore, supporting the spacer sleeve against axial motion. This forcibly achieves that the acting load on the spacer body overcomes the friction between the spacer body and the spacer sleeve by pulling the spacer body into the spacer sleeve. The reinforced expansion of the spacer sleeve is thus offset by the enlargement of the bore.

Vzmetni obroč lahko s svojo stranjo, ki je obrnjena proč od razporne tulke, nalega na ploskev obroča, ki je lahko izoblikovana na mozniku ali pa je tvorjena s čelno stranjo privijačenega elementa oz. distančne tulke. Pri zabijanju moznika v izvrtino se vzmetni obroč opre na tej obročasti ploskvi. Da bi se obdržalo središčenje vzmetnega obroča pred in med montažo, se lahko na vzmetnemu obroču sosednji obročasti ploskvi izvede ustrezno obročasto štrlino, ki je prilagojena preseku vzmetnega obroča. Slednji ni na tej štrlini postavljen le za središčenje, temveč deluje ta obročasta štrlina pri stiskanju vzmetnega obroča, tako da vzmetni obroč izvaja osno silo na razporno tulko, s čimer podpira razpiranje.The spring ring, with its side facing away from the spacer sleeve, may rest on the face of the ring, which may be molded on the dowel or formed by the front side of the screwed element or. spacer sleeves. When thrusting the dowel into the bore, the spring ring rests on this annular surface. In order to retain the center of the spring ring before and during mounting, a suitable annular projection adapted to the cross-section of the spring ring may be made on the adjacent ring surface to the adjacent ring surface. The latter is not only centered on this projection, but this annular projection acts in the compression of the spring ring so that the spring ring exerts an axial force on the spacer sleeve, thus supporting the opening.

Če obsega moznik med glavo vijaka in vzmetni obroč razporejeno distančno tulko, ki tvori protiležaj za razporno tulko, je lahko tako na prednosten način krčilno območje sosednje vzmetnemu obroču. Slednji je lahko razporejen bodisi med distančno tulko in tulko iz umetne snovi, ki tvori krčilno območje, ali med tulko iz umetne snovi in razporno tulko. Pri slednji razporeditvi je smotrna izvedba, pri kateri ima razporna tulka stopničast in z delom svoje dolžine v tulko iz plastične mase vprijemajoč odsek, na katerega je poveznjen vzmetni obroč.If the dowel comprises a spacer spacer between the screw head and the spring ring, which forms a counterbalance to the spacer sleeve, the contraction region adjacent to the spring ring may thus be advantageously advantageous. The latter may be arranged either between the spacer sleeve and the plastic sleeve forming the shrinkage region, or between the plastic sleeve and the spacer sleeve. In the latter arrangement, a design is advantageous in which the spacer sleeve has a stepped and part of its length in a plastic sleeve gripping the section to which the spring ring is connected.

Pri zabijanju moznika v sprejemno izvrtino v sidrni osnovi se vzmetni obroč, ki štrli preko zunanjega premera razporne tulke, stisne na premer sprejemne izvrtine. Ker zaradi drobljenja pri izdelavi izvrtine praviloma nastane v območju ustja izvrtine lijakasta razširitev, je mogoče brez večjih težav zabiti moznik s štrlečim vzmetnim obročem. Pri ostrorobih izvrtinah brez lijakastega ustja lahko zaradi štrlečega vzmetnega obroča vsekakor pride do zabijalnega upora, za premagovanje katerega so potrebni močnejši udarci s kladivom, pri čemer se pojavi nevarnost poškodbe moznika.When thrusting the dowel into the receiving hole in the anchor base, the spring ring projecting over the outer diameter of the spacer sleeve is compressed to the diameter of the receiving hole. As the crushing of the borehole generally results in a funnel extension in the mouth area of the borehole, a dowel with a projecting spring ring can be easily inserted. For sharp holes without a funnel mouth, a protruding spring ring can in any case result in a driving resistance, which requires stronger hammer blows, with the risk of damaging the dowel.

Da bi se omogočilo lažje zabijanje moznika tudi pri nepoškodovanih izvrtinah, se lahko uporabi v razporno tulko razporejen vzmetni obroč. Z vzmetnim obročem, ki sedi v obročasti razširitvi razporne tulke, se preko premera izvrtine razširi le konec razporne tulke, ki je obrnjen proč od razpornega telesa, medtem ko ima drugi konec razporne tulke nekoliko manjši zunanji premer kot je premer izvrtine. S tem tvori zunanja ploskev razporne tulke začetno poševnino, ki pri manjšem zabijalnem uporu dovoljuje stisnitev razporne tulke na premer izvrtine. Po zabijanju moznika se razporno telo z vrtenjem vijaka premakne v osni smeri, razporno tulko pa se za sidranje slednjega potegne v izvrtino. Če sedaj zaradi tvorjenja odrgnin pride do povečanja izvrtine, je en konec razporne tulke z elastičnim vzmetnim obročem v položaju, da se prilagodi tej razširitvi izvrtine in v izvrtini trdno prednapne. S tem se prisilno doseže, da na razporno telo delujoča obremenitev premaga trenje med razpornim telesom in razporno tulko ter potegne razporno telo v razporno tulko.In order to allow the dowel to be inserted more easily even in the case of intact holes, a spring ring arranged in a spacer sleeve may be used. With the spring ring seated in the annular extension of the spacer sleeve, only the end of the spacer sleeve facing away from the spacer body extends beyond the bore diameter, while the other end of the spacer sleeve has a slightly smaller outer diameter than the bore diameter. In this way, the outer face of the spacer sleeve forms an initial slant, which, with a smaller rammer resistance, allows the spacer sleeve to be compressed to the bore diameter. After driving the dowel, the spacer body moves in the axial direction by rotating the screw, and the spacer sleeve is pulled into the bore to anchor the latter. If a bore is now enlarged due to the formation of abrasions, one end of the spacer sleeve with an elastic spring ring is in a position to accommodate this expansion of the bore and firmly prestress in the bore. This forcibly achieves that the acting load on the spacer body overcomes the friction between the spacer body and the spacer sleeve and pulls the spacer body into the spacer sleeve.

Z zdrsom razpornega telesa in s tem povezanim razpiranjem razporne tulke se izravna povečanje izvrtine.By sliding the spacer body and the associated spraying of the spacer sleeve, the enlargement of the bore is offset.

Čelni konec razširitve lahko prekriva del profila vzmetnega obroča. S tem je vzmetni obroč varovan proti izpadu iz obročaate razširitve notranje izvrtine razporne tulke.The front end of the extension may overlap part of the suspension ring profile. This protects the suspension ring from falling out of the annular expansion of the inner bore of the spacer sleeve.

Nadalje je lahko špranja vzmetnega obroča poravnana s skoznjo zarezo razporne tulke. S to izvedbo se doseže optimalno izrabo radialne napenjalne sile vzmetnega obroča za razširitev razporne tulke.Further, the spring of the spring ring can be aligned with the notch of the spacer sleeve. This embodiment achieves optimum utilization of the radial tension force of the spring ring to extend the spacer sleeve.

V načrtu so predstavljeni izvedbeni primeri izuma, kjer kaže sl. 1 v izvrtino vstavljen moznik z med tulko iz umetne snovi in distančno tulko razporejenim vzmetnim obročem, sl. 2 med razporno tulko in tulko iz umetne snovi razporejen vzmetni obroč, sl. 3 moznik, pri katerem je vzmetni obroč razporejen med razporno tulko in obročasto ploskvijo privijačenega elementa, sl. 4 moznik z v razporni tulki razporejenim vzmetnim obročem.The plan illustrates embodiments of the invention, where FIG. 1 shows a dowel inserted into the bore with a plastic sleeve spaced between the plastic sleeve and the spacer sleeve, FIG. 2 shows a spring ring between the spacer sleeve and the plastic sleeve; FIG. 3 is a dowel in which the suspension ring is arranged between the spacer sleeve and the annular surface of the screwed element; FIG. 4 dowel with spring ring arranged in spacer sleeve.

Moznik po sl. 1 sestoji iz od njegove uvajalne čelne strani do preko enega dela njegove dolžine večkrat utorjeno razporno tulko 1 in iz preko vijaka 2 v razporno tulko 1 za razširitev slednje vpotegljivo razporno telo 3- Za pnvezavo razpornega telesa z vijakom ima razporno telo 3 navoju vijaka 2 prilagojen notranji navoj 4. Za premostitev praznin pri napenjanju pred6 meta 5, ki ga pritrjujemo, je med razporno tulko 1 in distančno tulko 6 kot krčilno območje razporejena tulka 7 iz umetne snovi, ki s povezavo razporne tulke 1 in v izvrtini 8 razstezajočimi se vzdolžnimi rebri 9 istočasno služi kot sojemalna varovalka za razporno tulko 1. Za povezavo razporne tulke 1 s tulko 7 iz umetne snovi ima razporna tulka posnet odsek 10, ki prijemlje v notranjo izvrtino tulke 7 iz umetne snovi. Med distančno tulko 6 in tulko 7 je razporejen vzmetni obroč 11, katerega zunanji premer presega premer razporne tulke. Za moznik s premerom izvrtine do okoli 12 mm znaša smotrno nadmera vzmetnega obroča 11 okoli 1 mm, za večje premere izvrtin pa znaša nadmera okoli 1.5 mm.The dowel of FIG. 1 consists of a grooved spacer 1 grooved from one of its introductory faces to one part of its length and from the screw 2 into the spacer sleeve 1 to extend the latter absorbent spacer body 3- To attach the spacer body to the screw, the spacer body 3 has a thread 2 adapted 4. In order to bridge the gap in the tensioning of the 6th target 5, which is fastened, a plastic sleeve 7 is arranged between the spacer sleeve 1 and the spacer sleeve 6, which extends longitudinal ribs with the connection of the spacer sleeve 1 and the bore 8. 9 simultaneously serves as a pickup fuse for the spacer sleeve 1. To connect the spacer sleeve 1 to the plastic sleeve 7, the spacer sleeve has a tapered section 10 that grips the inner bore of the plastic sleeve 7. A spacer ring 11 is arranged between the spacer sleeve 6 and the sleeve 7 whose outer diameter exceeds the diameter of the spacer sleeve. For a dowel with a bore diameter of up to about 12 mm, the spring ring overhang of 11 is approximately 1 mm, and for larger bore diameters it is approximately 1.5 mm.

Na osnovi nadmere vzmetnega obroča 11 se le-ta pritiska po zabitju moznika v izvrtino 8 trdno na ostenje izvrtine. Kot protiležaj za napenjanje predmeta 5, ki ga pritrjujemo, in za uvlačenje razpornega telesa 3 služi glava 12 vijaka, ki se preko podložne plošče 13 opira na zunanji ploskvi predmeta, ki ga pritrjujemo. Z izvajanjem vrtilnega momenta na glavo 12 vijaka se razporno telo 3 potegne v razporno tulko 1. Pri tem se z vzdolžnimi utori 14 tvorjene razporne lamele razporne tulke 1 radialno vtisnejo v ostenje izvrtine. Če po sidranju pride zaradi tvorjenja odrgnin do povečanja izvrtine, prepreči na ostenje izvrtine vtisnjeni vzmetni obroč 11 osno premaknitev razporne tulke 1. S tem se šiloma doseže nadaljnje uvlačenje razpornega telesa 3 v razporno tulko, tako da se z dodatno razširitvijo razporne tulke 1 izravna povečanje izvrtine.Based on the diameter of the spring ring 11, it is pressed firmly against the bore of the bore after the dowel is inserted into the bore 8. As a counterbalance, the head 12 of the screw, which rests on the outer surface of the fastening object 13, through the washer 13 through the washer, is used to tighten the object 5 to be fastened and to retract the spacer body 3. By applying torque to the head 12 of the screw, the spacer body 3 is pulled into the spacer sleeve 1. In this way, the spacer sleeves 1 formed by the longitudinal grooves 14 are radially pressed into the bore hole. If, after anchoring, an increase in the bore occurs due to the formation of abrasions, the insertion of the spring ring 11 prevents the axial displacement of the spacer sleeve 1. In this way, the further insertion of the spacer 3 into the spacer sleeve is further achieved by offsetting the magnification by further expansion of the spacer sleeve 1. bores.

Pri razporeditvi vzmetnega obroča 11 ’ med razporno tulko 1 in tulko 7 po sl. 2 sedi vzmetni obroč 11» _na posnetem, v tulkoIn the arrangement of the spring ring 11 'between the spacer sleeve 1 and the sleeve 7 of FIG. 2 sits a spring ring 11 ” _{on the} clip, into the sleeve

7 vprijemajočem podaljšanem odseku 10’ razporne tulke 1. Ker je pri tej rešitvi zahtevana majhna debelina žice vzmetnega obroča 11’, se priporoča vzmetni obroč, izdelan iz žice pravokotnega prečnega preseka.7 to the adjoining extension section 10 'of the spacer sleeve 1. Since this solution requires a small thickness of spring 11', a spring made of rectangular cross-section wire is recommended.

Na sl. 3 je predstavljen nadaljnji izvedbeni primer, pri katerem je vzmetni obroč 11 razporejen med razporno tulko 1 in navojnim steblom 15. Slednje je z razpornim telesom 3 povezano preko navojnega odseka 17, ki prijemlje v navojno izvrtino 16 navojnega stebla. Pri manjših premerih moznika je lahko razporno telo 3 izvedeno na navojnem steblu 15. Na čelni strani 18 razpornega telesa 3 je izvedena štrleča obročasta ploskev 19, ki ustreza presečni obliki vzmetnega obroča 11, in ki središči vzmetni obroč 11 pred in med montažo. Poleg tega pa pomaga ta štrleča obročasta ploskev 19 tudi pri poteku razpiranja.In FIG. 3 shows a further embodiment in which the spring ring 11 is disposed between the spacer sleeve 1 and the threaded stem 15. The latter is connected to the spacer body 3 via a threaded section 17 that grips a threaded bore 16 of the threaded stem. For smaller dowel diameters, the spacer body 3 may be provided on a threaded stem 15. On the front side 18 of the spacer body 3, a protruding annular surface 19 is provided, corresponding to the cross-sectional shape of the spring ring 11, and which centers the spring ring 11 before and during assembly. In addition, this protruding annular surface 19 also helps in the course of spreading.

Moznik po sl. 4 sestoji iz od njegovega uvajalnega čelnega konca do preko enega dela njegove dolžine večkrat utorjene in vsaj en skoznji utor 14’ obsegajoče razporne tulke 1 in iz preko vijaka 2 v razporno tulko 1 za razširitev slednje potegljivo razporno telo 3· Slednje je enodelno povezano z vijakom 2, ki za povezavo z navojnim steblom 15 znova vprijemlje v njegovo navojno izvrtino 16. Notranja izvrtina 20 razporne tulke 1 je na njenem od razpornega telesa proč obrnjenem koncu opremljena z obročasto razširitvijo 21, v katero je vstavljen vzmetni obroč 11. Preko slednjega se ta konec razporne tulke 1 razširi na zunanji premer, ki je večji od premera moznika.The dowel of FIG. 4 consists of from its introductory front end to one of its lengths repeatedly grooved and at least one through groove 14 ' comprising spacer sleeves 1 and from through a screw 2 to a spacer sleeve 1 to extend the latter pullable spacer body 3 · The latter is connected in one piece by a screw 2, which, in connection with the threaded stem 15, re-engages its threaded bore 16. The inner bore 20 of the spacer sleeve 1 is provided with a annular extension 21 at its end of the spacer body away from the spacer end, into which a spring ring 11 is inserted. the end of the spacer sleeve 1 extends to an outside diameter greater than the diameter of the dowel.

Na osnovi nadmere tega konca razporne tulke se le-ta po zabitju moznika v izvrtino 8 trdno pritisne na ostenje izvrtine.Based on the position of this end of the spacer sleeve, it is pressed firmly on the bore hole after the dowel is inserted into the bore 8.

Kot protiležaj za napenjanje telesa 5, ki ga pritrjujemo, in za uvlačenje razpornega telesa 3 služi matica 12, ki se preko podložne plošče 13 opira na zunanjo ploskev predmeta, ki ga pritrjujemo. Z izvajanjem vrtilnega momenta na matico 12 se razporno telo 3 potegne v razporno tulko 1. Pri tem se z vzdolžnimi utori 14 tvor jene razpiralne lamele razporne tulke 1 radialno vtisnejo v ostenje izvrtine. Če po sidranju pride zaradi tvorjenja odrgnin do povečanja izvrtine, prepreči z vzmetnim obročem 11 trdno na ostenje izvrtine pritisnjen konec razporne tulke osni premik razporne tulke 1. S tem se prisilno doseže nadaljnje uvlačenje razpornega telesa 3 v razporno tulko, tako da se z dodatnim razpiranjem razporne tulke 1 izravna povečanje izvrtine.As a counterbalance for the tensioning of the body 5, which is fastened, and for the retraction of the spacer body 3 is a nut 12, which, through the washer plate 13, rests on the outer surface of the object to be fastened. By applying torque to the nut 12, the spacer body 3 is pulled into the spacer sleeve 1. In this case, the longitudinal grooves 14 of the formed spacer blade of the spacer sleeve 1 are radially pressed into the bore hole. If, after anchoring, an increase in the bore occurs due to the formation of abrasions, the spring end of the spacer sleeve is pressed by the spring ring 11 to axially move the spacer sleeve 1. In this way, further insertion of the spacer body 3 into the spacer sleeve is forcibly obtained by further expanding expansion sleeves 1 offset the bore.

Za varovanje vzmetnega obroča 11 v obročasti razširitvi 21 razporne tulke 1 prekriva čelni konec razširitve del profila vzmetnega obroča. Nadalje je vzmetni obroč 11 v razširitvi 21 za optimalno izrabo napenjalne sile vzmetnega obroča tako razpo rejen, da špranja vzmetnega obroča sovpada s skoznjim utorom 14 razporne tulke 1.To secure the spring ring 11 in the annular extension 21 of the spacer sleeve 1, the front end of the extension overlaps a portion of the profile of the spring ring. Further, the spring ring 11 in extension 21 for optimum utilization of the tension force of the spring ring is arranged so that the spring of the spring ring coincides with the groove 14 of the spacer sleeve 1.

Claims

PATENT APPLICATIONS

Claims 1. A spacer sleeve comprising, in the spacer sleeve, a pull-apart spacer body and a bearing element on which the spacer sleeve lies when the spacer body is drawn in, characterized in that a suspension ring (2) is mounted on the screw (2). 11, 11 '), the outside diameter of which exceeds the diameter of the spacer sleeve (1) and which is compressible to the diameter of the spacer sleeve (1).

A dowel according to claim 1, characterized in that the spring ring (11) extends from its spacer sleeve (1) away from it to the annular surface, which is formed on a counterbalance and made on the dowel.

A dowel according to claim 2, characterized in that the annular flat tube forms a face on the screw (2) of the located spacer sleeve (6), the screwed element (15), a step made on the screw (2) or the like.

A dowel according to any one of the preceding claims, characterized in that the spring ring (11) is laterally disposed on a projecting annular surface (19) corresponding to the cross-sectional shape of the spring ring (11).

5. Dowel according to one of the preceding claims, characterized in that the suspension ring (11, 11 ') borders on the shrinkage region.

6. A dowel according to claim 5, characterized in that the shrinkage region is made as a spacer sleeve (1) of a plastic insert (7), wherein the spacer sleeve (1) comprises a recorded section (10, 10 ') which by part of its length, it grips into a plastic sleeve and to which a spring ring (11, 11 ') is connected.

A dowel according to any one of the preceding claims, characterized in that the spring ring (11 ') is at least partly of a cross-section.

8. A pivot with a spacer sleeve, with the latter comprising at least one through groove, by means of a screw-tightening spacer body, and with a bearing element that secures the spacer sleeve in the bore, and which is designed as a spring ring, characterized in that the bore (20) of the spacer sleeve (1) comprises a annular extension (21) at its end of the spacer body away from the spacer body, into which a spring ring (11) is inserted, with the spring ring (11) the end of the spacer sleeve at a diameter that protruding beyond the outer diameter of the dowel, extendable and compressible in the bore (8) to its diameter.

9. A dowel according to claim 1, characterized in that the front end of the extension overlaps part of the profile of the spring ring.

10. A dowel according to claim 1, characterized in that the spring of the spring ring is aligned with the through groove of the spacer sleeve.