DK168800B1

DK168800B1 - Anchoring element with spreading bush

Info

Publication number: DK168800B1
Application number: DK165689A
Authority: DK
Inventors: Arthur Fischer
Original assignee: Fischer Artur Werke Gmbh
Priority date: 1988-05-24
Filing date: 1989-04-06
Publication date: 1994-06-13
Also published as: BR8902374A; DE3817512A1; ATE68854T1; EP0343342A1; JPH0637882B2; EP0343342B1; DK165689D0; DK165689A; JPH0211905A; DE58900396D1; ES2027809T3

Abstract

Fastening elements with an expanding sleeve (5) consisting of spring steel can be knocked into drillholes of a masonry, the expanding sleeve (5) being slightly compressed in terms of its diameter and thereby being braced relative to the drill hole wall. So that the expanding sleeve (5), when being knocked in, bears firmly against a shoulder (10) formed on the shank (1), a narrowing in the form of inwardly bent tabs (8, 9) is provided on the side of the expanding sleeve (5) against this shoulder (10). This at the same time improves the bracing of the expanding sleeve (5). <IMAGE>

Description

i DK 168800 B1in DK 168800 B1

Den foreliggende opfindelse angår et forankringselement med en spredebøsning og af den i indledningen til krav 1 angivne art.The present invention relates to an anchoring element having a spreading bush and of the kind specified in the preamble of claim 1.

Fra tysk offentliggørelsesskrift nr. 35 26 784 kendes 5 et forankringselement, der er egnet til selvfastklemmende forankring i et borehul. Forankringselementet har et skaft, på hvilket der er påsat en spredebøsning, som i ubelastet tilstand står en smule frem i forhold til skaftdiameteren. Spredebøsningen lader sig ved indsætning i et borehul fjβίο derelastisk sammentrykke en smule, hvorved den spænder sig fast i borehullet. Idet forankringselementet slås ind, må derfor den ved den elastiske fastspænding fremkaldte friktionskraft overvindes. Herved kan det forekomme, at den skaftdel, som støder op mod spredebøsningen, utilsigtet forskydes 15 delvis ind under spredebøsningen, hvilket især kan forekomme, når spredebøsningen ligger en smule skævt an mod den på dennne del af skaftet udformede skulder.From German Publication No. 35 26 784 5 is known an anchoring element suitable for self-clamping anchoring in a borehole. The anchoring element has a shaft on which is mounted a spreader bushing which, in unstressed condition, stands slightly forward relative to the shaft diameter. The spacer sleeve can be slightly compressed by insertion into a borehole slightly, thereby clamping it into the borehole. Therefore, as the anchoring element is engaged, the frictional force induced by the elastic clamping must be overcome. Hereby, it may occur that the shaft portion adjacent to the spreader bush is inadvertently displaced partially below the spreader bush, which may occur especially when the spreader bush is slightly skewed towards the shoulder formed on this part of the shaft.

Den opgave, som ligger til grund for opfindelsen, er at udforme den som fjederbøsning fremstillede spredebøsning 20 på en sådan måde, at den ligger sikkert an mod den tilgrænsende skaftdel ved islagningen af forankringselementet i et borehul.The object of the invention is to design the spring bushing spreading sleeve 20 in such a way that it is securely in contact with the adjoining shaft part when inserting the anchoring element into a borehole.

Løsningen af denne oppgave opnås ifølge opfindelsen ved, at forankringslementet udformes som angivet i den ken-25 detegnende del af krav 1. På spredebøsningen er der udformet indefter vinkelbøjede lasker, som ved islagningen ligger sikkert an mod en skulder på skaftet. Denne spredebøsning bliver ved hjælp af de indefterbøjede lasker tilspidset i dette område, hvorved det sikres, at spredebøsningen heller 30 ikke i uregelmæssigt forløbende borehuller griber ud over det tilgrænsende skulderområde af skaftet. Endvidere har de indefterbøjede lasker den fordel, at spredebøsningen ved i-slagningen på grund af de på laskerne angribende kræfter søger at bøjes udefter, hvorved der opnås en bedre fastspæn-35 ding mellem spredebøsningen og borehullets væg. Samtidig centreres spredebøsningen ved islagningen bedre, således at der også derved undgås en uønsket overlapning mellem skulderområdet og spredebøsningen.The solution of this task is achieved according to the invention in that the anchoring element is configured as defined in the characterizing part of claim 1. On the spreading sleeve, there are formed inside angled bends which secure against a shoulder on the shaft when laying. This spreading bush is tapered in this area by means of the inner bends, thereby ensuring that the spreading bush 30 also does not engage in irregularly extending boreholes beyond the adjacent shoulder area of the shaft. Furthermore, the inner bends have the advantage that the spreading bush at the impact seeks to bend outwards due to the forces attacking the lasers, thereby obtaining a better clamp between the spreading bush and the borehole wall. At the same time, the spreading bush is centered better during the laying process, thus also avoiding an undesirable overlap between the shoulder area and the spreading bush.

DK 168800 B1 2DK 168800 B1 2

Opfindelsen skal i det følgende beskrives nærmere med henvisning til et på tegningen vist udførelseseksempel. På tegningen viser:The invention will now be described in more detail with reference to an exemplary embodiment shown in the drawing. In the drawing:

Fig. 1 et forankringselement med spredebøsning, 5 fig. 2 et længdesnit gennem den på fig. 1 anvendte spredebøsning, og fig. 3 en afbildning set fra siden af den på fig. 1 anvendte spredebøsning.FIG. 1 shows an anchoring element with a spacer sleeve; FIG. 2 is a longitudinal section through the embodiment of FIG. 1, and FIG. 3 is a side view of the one of FIG. 1 spreader bushing used.

Det på fig. 1 viste forankringselement består af et 10 skaft 1, som på dets bageste ende har et gevindafsnit 2 til fastspænding af en genstand, og idet forreste område har et i diameter reduceret afsnit 3, til hvilket der ved enden er tilsluttet en spredekonus 4. På det således indsnævrede afsnit er der påsat en af fjederstål bestående spredebøsning 15 5, der med radialt og aksialt spillerum omslutter dette af snit 3. Mellem spredebøsningen 5 og det indsnævrede afsnit 3 er der et spillerum 6.The FIG. 1, an anchor element shown in Fig. 1 consists of a shaft 1, which has a threaded portion 2 at its rear end for clamping an object, and the front area having a diameter-reduced section 3, to which a spreading cone 4 is connected at the end. thus, a narrowed section is provided with a spring steel comprising bushing sleeve 15 5 which, with radial and axial clearance, encloses this in section 3. Between the sleeve bushing 5 and the narrowed section 3 there is a clearance 6.

Spredebøsningen 5 har på den på fig. 1 viste side en gennemgående længdeslids 7, der tillader en fjederelastisk 20 sammentrykning af spredebøsningen 5.The spreader bush 5 has on the part shown in FIG. 1 shows a continuous longitudinal slot 7 which permits a spring-elastic compression of the spreading bush 5.

På fig. 2 der vist et fuldstændigt længdesnit gennem den på fig. 1 viste spredebøsning 5. Ved den nederste ende har spredebøsningen 5 to modsatliggende, indefterbøjdede lasker 8,9, der ligger an mod en skulder på skaftet 1. På 25 den på fig. 1 ikke synlige bagside af spredebøsningen står en liste 11 frem, hvilken liste udgør en yderligere sikring mod, at spredebøsningen kan glide i borehullet. Med den fremstående kant af listen 11 kan denne gribe ind i borehulsvæggen som en modhage, således at spredebøsningen 5 hol-30 des sikkert i borehullet.In FIG. 2, showing a complete longitudinal section through the one shown in FIG. 1 at the lower end, the spreader bush 5 has two opposite, inwardly bent loads 8,9 which abut against a shoulder of the shaft 1. In FIG. In the back of the spreader sleeve which is not visible, a strip 11 is provided, which provides further protection against the spreader sleeve sliding into the borehole. With the protruding edge of the strip 11, it can engage the borehole wall as a barb, so that the spreader bush 5 is securely held in the borehole.

Som det fremgår af fig. 2 har spredebøsningen 5 på dens bagside en slids 12, der ligesom længdeslidsen 7 tillader en udspredning af spredebøsningen 5 i området ved spredebøsningen 4. Udspredningen af spredebøsningen 5 opnås ved, 35 at spredekonussen 4 trækkes ind i spredebøsningen 5. Dette sker eksempelvis ved, at der på gevindafsnittet 2, der rager ud af borehullet, først påsættes en genstand, som skal forankres og derefter anbringes en møtrik, som tilspændes. Der- DK 168800 Bl 3 ved trækkes spredebøsningen 4 udefter, medens spredebøsnin-gen 5 stedfast udspændes mod borehullets vægge.As shown in FIG. 2, the spreader bush 5 has on its rear a slot 12 which, like the longitudinal slot 7, allows a spread of the spreader bush 5 in the area of the spout bushing 4. The spreading of the spout bushing 5 is achieved by pulling the spreader cone 4 into the spreading bushing 5. This is done, for example, by on the threaded section 2 projecting out of the borehole, first attach an object to be anchored and then place a nut which is tightened. Then, by the spreading bushing 4, the spreading bushing 4 is pulled outwards, while the spreading bushing 5 is firmly clamped against the borehole walls.

Desto stærkere møtrikken tilspændes, desto længere trækkes spredekonussen 4 indefter i spredebøsningen 5, således at 5 der opnås en tilsvarende kraftig udspredning af spredebøsningen 5. Ved udspredningen af spredebøsningen 5 opnås en sikker og høje trækbelastninger modstående forankring af forankringselementet i borehullet.The stronger the nut is tightened, the further the spreading cone 4 is pulled inwardly within the spreading bush 5 so that 5 a correspondingly strong spreading of the spreading bushing 5 is achieved.

Claims

An anchoring element with a spreading bush for self-clamping anchoring in boreholes and consisting of a shank with a threaded section or similar device for anchoring an object and with a spreading cone arranged at its end, which enters a narrowed section of the shaft a narrowed section disposed therein of a spring bushing having a larger diameter than the shaft diameter, unloaded, characterized in that the spreader bushing (5) has lugs (8,9) facing away from the spreading cone. forms an obtuse angle inward relative to the spreading bush and whose end edges are directed to a shoulder (10) which forms a transition between the narrowed section (3) and the shaft (1).

Anchoring element according to claim 1, characterized in that between the lugs (8,9) there is at least one molding (11) formed on the spreading sleeve (5) which is outwards.