Fischerwerke Artur Fischer Gmbh & Co Kg

Werner Heinzelmann

Manfred Haage

Rainer Mallee

The invention relates to an expansible anchor () for anchoring in a cylindrical drilled hole (). The invention proposes constructing the expansible anchor () with a tubular basic anchor part (), on which a hollow conical expansion portion () is formed by means of a forming procedure, on which expansion portion () an expansion sleeve () bent out of sheet metal is mounted. As a result of axial displacement of the expansion sleeve () on the expansion portion (), the expansible anchor () becomes anchored in the drilled hole (). The expansible anchor () exhibits subsequent expansion behaviour in the event of widening of the drilled hole (), for example as a consequence of crack formation.

Expansion bolt

An expansible plug comprises a closed shank section formed as a shank sleeve provided with a screw channel and a longitudinal divided expansible shank, the shank being formed by two shank halves provided with staggered expansible elements which interlock to form a closed expansion region, the expansible elements being offset relative to one another and having bores arranged eccentrically relative to a center line of the expansible shank and overlapping so that an overlapping region forms a constricted screw channel, the expansion region tapering conically toward a plug tip, and one of the shank halves being connected to the shank sleeve in a joining region by a secure joint.

Expansible plug

The drilling device for memory, particularly aerated concrete, includes an impact drilling machine and an impact rotation tool to be clamped in the drilling machine. To prevent the impact-drilling shank jamming in the drill hole as it is withdrawn, and nevertheless to achieve maximum holding power in the masonry, the impact-rotation tool consists of an impact-drilling shank tapered conically toward a tip from a cylindrical middle portion of increased diameter, a carrier bush connected with a circumferential shoulder of the impact-drilling shank and a ram engaging with some play in an internal bore of the carrier bush. A drill bit-like locating means is provided on the ram for engagement in the drilling machine.

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Freudenstadt, Germany

Werner Heinzelmann