Hilti Aktiengesellschaft

Zsolt Kosa

Jens Schneider

Karsten Brandenburg

Lajos Tòth

Klaus-Peter Bohn

Carsten Peters

Roland Foser

Aviral Shrot

Attila Kenez

Lajos Tóth

The chisel includes a tip (), a working section (), and an impact surface (), and a longitudinal axis () that extends through the tip (), the working section (), and the impact surface (). The working section () includes multiple webs () that extend along the longitudinal axis () and that are distributed about the longitudinal axis () in the circumferential direction (). For at least one of the webs (), a dimension () in the circumferential direction () increases by at least one-third with increasing distance () from the longitudinal axis (). The webs become significantly wider toward the outside and thinner toward the longitudinal axis.

Chisel

A chisel according to the present technology has a reduced tendency to jam in a substrate. The chisel is on an axis in the striking direction with successively a striking surface, a shank, a spreading element and a tip. The spreading element has multiple ribs around the axis extending along the axis. The ribs each have a wave shape formed through a tangential deflection with respect to the axis.

A production process is provided for a drill including the following steps. From a rod-shaped blank comprising an end section, a central section, and a hollow space extending at least through the end section and the central section along an axis of the blank, the end section is formed in a direction extending radially relative to the axis, the diameter of the hollow space in the end section being reduced. Either a cutting element is attached to the end section or grooves are introduced into the end section for forming a shank.

Hollow drill and a production process for the same

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Kecskemet, Hungary

Zsolt Kosa