Hilti Aktiengesellschaft

Michael Werner

Erich Wisser

Thomas Belz

Markus Hartmann

Helmut Gassner

Kai-Uwe Keller

Reinhard Lins

Hubert Forster

Susanne Kossian

Franz-Xaver Huber

Herbert Kaufmann

Johannes Dobler

Romed Staggl

Gin-Won Kang

A fastener is formed of an axially extending shaft ( ) and a driving head on the end directed away from the setting direction, and has on its underside or first side ( ) for the prevention of unintended loosening, a plurality of webs ( ) extending radially from the longitudinal axis (L) of the shaft up to the external periphery ( ) of the underside ( ). The webs ( ) having a substantially trapezoidal cross-section, are limited by a face surface ( ) on the underside ( ), extending between two flank surfaces.

Fastener driving head

A thread forming screws including opposite flanks connecting the screw crest region with the screw root region and tapering outwardly toward the root region, with each flank being formed of outer and inner flank sections tapering toward the root sections at different angles, and with the crest region being formed of a first region section ( ) extending parallel to a central axis of the screw and a second, inclination region section ( ) inclined toward the root region ( ) in a direction opposite a setting direction (S) at an angle of from about 10&deg; to about 45&deg;.

Thread forming screw

An expansion dowel, including an expansion sleeve (,) having a rear section (,) provided with an inner thread (,), an opposite expansion section (,) with a plurality of expansion tabs (,) separated by axial slots, and a stepped bore (,) having in, the expansion section (,), a smaller inner diameter (s) than in the rear section (,) and a circumferential annular shoulder (,) formed in a transitional region between the rear and the expansion sections (,) and facing substantial toward a rear end of the expansion sleeve (,), and an expansion member (,) provided at a front end of the expansion sleeve (,) projecting beyond the front, the expansion member (,) projecting beyond the front end of the expansion sleeve (,), widening substantially conically in a setting direction (,), and having a length (l) larger than a length (k) of the expansion section (,) of the expansion sleeve (,).

Expansion dowel

An undercut self-cutting dowel including a body (2) having a through-bore (13), a load application element (3) provided in a rear portion of the body (2), and a plurality of expansion tabs (4) separated by axial slots and formed in a front portion of the body (2), opposite the rear portion, with the expansion tabs (4) extending from a plastic hinge (5) to a free front end of the body (2), and with the body (2) having, in a region of the plastic hinge (5), a reduced, in comparison with the rear portion, outer diameter which results in formation of an annular shoulder (6) facing in a setting direction (s), with the outer diameter again increasing toward the free front end of the body (2); an expansion member (7) held in the through-bore (13) and projecting beyond the free front end of the body (2); and an expansion sleeve (8) surrounding sections of the expansion tabs (4) which adjoin the plastic hinge (5) and radially expandable at least in its front, in the setting direction, section, with a largest outer diameter (h) of the sleeve (8) being smaller than or equal to a largest diameter (a) of the body (2).

Undercut self-cutting dowel

A drive-in dowel formed as a sleeve (2, 22) provided with a load application element (3, 23) and having a front section formed of a plurality of expansion elements separated from each other by longitudinal slots, with each of the plurality of expansion elements being formed of a trailing expansion tab (8, 28) and a leading expansion tab (9, 29) separated by a flexible transitional region (6, 26) and forming with each other an angle (.alpha.) from about 100.degree. to about 160.degree., with a front end of the leading tab being located closer to a sleeve longitudinal axis (A) than the flexible transitional region (6, 26); and with the sleeve being provided with a plurality of chisel-like cutters (10) on outer surfaces of respective flexible transition regions (6; 26) which substantially do not project beyond the outer diameter of the sleeve.

Drive-in dowel

A drive-in dowel including an inner sleeve (2) having a load application element (3), a cone-shaped widening section (5) formed at a front, in a setting direction (S), end of the inner sleeve (2), and a substantially cylindrical support section (6) adjoining the cone-shaped widening section (5) and having an outer diameter (w) which is smaller than a largest diameter (d) of the cone-shaped widening section (5), and an outer sleeve (7) arranged coaxially with the inner sleeve (2) and having, in its front, in the setting direction (s), region, a plurality of expansion tabs (8) separated from each other by longitudinal slots and radially expandable upon the outer sleeve (7) being impact driven over the cone-shaped widening section (5) of the inner sleeve (2), with the expansion tabs (8) being provided with annularly arranged, chisel-like cutters (11).

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München, Germany

Michael Werner