Hilti Aktiengesellschaft

Stefan Raber

Werner Kaibach

Hans-J&uuml;rgen Negele

Franz Popp

Hanspeter Schad

Thomas Doppelbauer

Alois K&ouml;lbl

Hans-Jurgen Negele

Ulrich Genschmer

A drill for forming undercuts in cylindrical bores formed in stone or concrete and including a drilling member ( ) having a stem ( ) provided, at its opposite longitudinal ends, respectively, with a shank ( ) receivable in a chuck of a hand-held drilling tool and a cutting head ( ) with abrasive cutting bodies, and a sleeve ( ) for receiving the drilling member ( ) and having, at its end adjacent to the shank ( ), a radial collar ( ), a drag bearing ( ) arranged in side the sleeve for supporting the drilling member ( ), and at least one opening ( ) formed in a front, in a direction toward the cutting head ( ), section of the sleeve and spaced axially from the drag bearing ( ) by a distance (a) amounting to from about 0.05&times;D to about 0.6&times;D, where D is an outer diameter of the sleeve in the drag bearing region of the sleeve.

Drill for forming undercuts in bores

A device for removing formlockingly anchored dowels including an anchor rod and an expansion sleeve ( ) displaceable along the anchor rod, the device including a sleeve-shaped support member ( ) having, at one of its ends, a support shoulder, an indexing projection ( ) extending beyond the support shoulder ( ) and provided with a load application element ( ) movable in a tensile operational engagement with the load application element ( ) of the dowel sleeve ( ); and a through-bore provided with an inner thread for receiving a shaft ( ) having an outer thread ( ) cooperating with the inner thread of the through-bore ( ) to provide for a relative axial displacement of the shaft ( ) with respect tot he support member upon rotation of the shaft ( ), the shaft ( ) having identical coupling elements ( ) provided at its opposite longitudinal ends, and an adaptor ( ) including an elongate section ( ) having at its free end connection element ( ) corresponding to the coupling element ( ) of the shaft ( ) and having, at its end opposite the elongate section ( ), a shank ( ) receivable in a chuck of a hand-held tool.

Device for removing formlockingly anchored dowels

A dowel including an anchor rod (,) provided at front, in a setting direction, end with a head portion (,) widening in the setting direction, and a sleeve (,) having a through-bore and axially displaceable along the anchor rod, with the sleeve (,) having, at its end adjacent to the head portion (,) an expansion region (,) formed by a plurality of expansion tabs (,) separated from each other by substantially axially extending slots (,) and radially expandable upon a relative displacement of the sleeve (,) and the anchor rod (,), and a sleeve section adjoining the expansion region (,) and having, in its rear end region (,), a larger diameter (G) than in its front end region (,) adjoining the expansion region (,), with the sleeve section having a narrowing intermediate region (,) extending between the rear end region (,) and the front end region (,) and having a smallest outer diameter (M) which is smaller than an outer diameter (F) in the front end region (,).

Dowel

A dowel including an anchor rod (2; 22) having a load application element at one of its longitudinal ends and a head (3; 23), a diameter of which increases toward the free end of the anchor rod, at its opposite end, an expansion sleeve (4; 24) having a bore through which the anchor rod (2; 22) extends and a plurality of expansion tabs (5; 25) separated from each other by longitudinal slots (6; 26) and extending from a circumferential groove (7) toward the head (3; 23), the expansion tabs (5; 25) expanding radially, upon the expansion sleeve (4; 24) being displaced over the head (3; 23), and a substantially ring-shaped member (8; 28) arranged in the circumferential groove (7) and substantially filling out the circumferential groove (7; 27) in an expanded condition of the expansion tabs (5; 25).

Undercut-engaging dowel

A setting tool for anchoring a spreading anchor having an anchor rod (1) and an expansion sleeve (4), the setting tool including a sleeve-shaped body (8) having an axial blind bore (11) opening at an end surface (13) and a lead-in surface (10) for receiving axial impacts, and provided at a rear end of the sleeve-shaped body (8) remote from the end surface (13) at which the blind bore (11) opens, and a marking element (17) arranged in a bottom (15) of the axial blind bore (11) of the sleeve-shaped body (8) for forming a permanent mark in a rear end surface (3) of the anchor rod (1) at the end of a setting process.

Setting tool

An undercut self-cutting spreading anchor with an anchor rod (5) provided, at one of its ends with a load application element and at another, opposite of its ends, with a head portion (7) a diameter of which increases toward a free end (6) of the anchor rod (5), with the head portion (7) having a substantially crowned shape, a largest diameter region (9), and at least two sections (11, 13) which adjoin the largest diameter region (9) and diameters of which diminish toward the free end (6) of the anchor rod (5), the adjoining section (11, 13) having annular surfaces (12, 13) mean inclination angles of which toward an axis (A) of anchor rod (5) increases in a setting direction (S); and a sleeve (2) displaceable axially along the anchor rod (5) and having a plurality of expansion tabs (3) separated by longitudinal slots and which expand radially upon sliding over the head portion (7) of the anchor rod (5).

Undercut self-cutting spreading anchor

An expansion anchor including an anchor rod (1) having a head (2) widening in an insertion direction S; and a sleeve (3) having a plurality of expansion tabs (6) separated from each other by slots (5) and extending from a plastic hinge (4) toward a free front end (7) of the sleeve (3), the expansion tabs (6) expanding radially upon relative displacement of the sleeve (3) and the anchor rod (2) and having each at least one groove-like depression (8 or 9) which opens in a region of the free front end (7) and extends at least along a portion of an axial length (1) of an expansion tab (6), with the groove-like depression (8 or 9) being inclined toward a straight line (G) extending parallel to a sleeve axis (A).

Expansion anchor with tabs having a changing curvature radius

An undercut self-cutting anchor including an anchor rod (2) having a stem(3) provided with a load application element (4) at its rear end and with a head portion (5) at its opposite end, with the head portion (5) widening toward a front end (6) of the anchor rod (2), and an expansion sleeve (8) longitudinally displaceable over the head portion (5) and having, at its end adjacent to the head portion (5), a plurality of expansion tabs (11), which are separated from each other by longitudinal slots (10) and extending in a direction toward the head portion (5), and a plastic hinge-forming transition region (13) extending toward the expansion tabs (11), with a wall thickness (t) of the expansion sleeve (8) in the transition region (13) decreasing in a direction toward a front end (9) of the expansion sleeve.

Undercut self-cutting anchor

A spreading anchor including an anchor rod (2) having, at its one end, a cone-shaped head portion (3) widening in a setting direction and, at its opposite end, a load application element, the anchor further including a sleeve (5, 16) surrounding the anchor rod (2) and having at its end adjacent to the head portion (3), an expansion section (7, 17) formed of a plurality of expansion tabs (9, 18) separated from each other by axially extending slots (8), and extending form a plastic hinge (11) in a direction toward the head portion (3), the expansion tabs (9) expanding radially upon relative displacement of the sleeve (5, 16) and the head portion (3), and the expansion tabs (9) having convexly curved, in the direction toward the head portion (3) free front edges (10, 19), with convexly curved free front edges (10, 19) of the expansion tab (9) forming, in a completely expanded position of the expansion tabs (9, 18), substantially arc sections of a circle (R).

Spreading anchor

A self-cutting, undercutting dowel (1) is formed of an axially extending anchor rod (2) with a head part (3) leading in a setting direction (S) of the dowel and an axially extending sleeve (5) laterally enclosing the anchor rod (2). At its end facing in the setting direction, the sleeve (5) has expansion sections (7) separated from one another by axially extending slots (6). The sleeve (5) can be driven over the head part (3) relative to the anchor rod (2) so that the expansion sections (7) flare radially outwardly. At least one of the expansion sections (7) has a tooth shape at its end facing in the setting direction forming a cutting edge (10) for cutting an undercut in a receiving material for the dowel. The cutting action is effected by rotating the sleeve (5). The cutting edge (10) is located at a side edge (11) of the expansion section (7) leading in the rotating direction (R) of the sleeve (5) and the cutting edge is inclined to an axis (A) of the sleeve at a first angle (.alpha.). The expansion section (7) with the cutting edge (10) has a trailing side edge (12) inclined relative to the axis (A) of the sleeve (5) at a second angle (.beta.). The sum of the two angles (.alpha.,.beta.) is less than 160.degree..

Self-cutting undercutting dowel

A self-cutting dowel including a dowel rod (2) having a head portion (3) which widens in a setting direction (S), and a sleeve (5) displaceable along the dowel rod (2) and having, at its end adjacent to the head portion (3) a plurality of expansion tabs (7) separated by longitudinal slots (6), with the sleeve (5) being displaceable onto the head portion (3) upon radial expansion of the expansion tabs (7), and with the sleeve (5) being displaceable onto the head portion (3) upon radial expansion of the expansion tabs (7), and with the sleeve (5) being provided with at least one cutter (10) for forming an under cut in a ground during a dowel setting process upon rotation of the sleeve (5), the at least one cutter (10) being provided on a leading, in a rotational direction (R), longitudinal edge (11) of one of the expansion tabs (7) and extending at least along a portion of the axial extent of the one expansion tab.

Growing community of inventors

Kaufering, Germany

Stefan Raber