Hilti Aktiengesellschaft

Friedhelm Schneider

Martin Noser

Hans Gschwend

Fritz Mark

Markus Hartmann

Heinz Kousek

Guenther Sanchen

A chuck () for a hand-held power tool (), which is connected with a motor-driven spindle () of the power tool for joint rotation therewith, includes a locking device for securing a shaft section of an exchangeable working tool and having a circular cross-section in the chuck () without a possibility of axial displacement and rotation relative to the chuck (), with the locking device having a clamping element () for securing the shaft section (), and an element () for transmitting rotation to the shaft section () and rotationally separated from the clamping element () by a rotary bearing ().

Chuck

Fastening apparatus is formed of a drilling tool (3) for drilling an axially extending borehole in a receiving material. The drilling tool (3) has a cutting member (4) at its leading end and its trailing end (5) is arranged to be inserted into a chuck in a hand held drilling device capable of rotating the drilling tool and providing axially directed hammer-like blows. A tubular fastening element (2) has a bore extending between its leading and trailing ends and is arranged to be anchored in the borehole formed by the drilling tool. The diameter of the bore in the fastening element is greater than the outside diameter of a cutting circle formed by the cutting member (4) of the drilling tool (3). The drilling tool (3) extends axially through the bore in the fastening element so that its cutting member projects from one end of the fastening element and its trailing end extends outwardly from the trailing end of the fastening element. The drilling tool is rotated by the drilling device, however, the fastening element is not rotated. While the borehole is being drilled by the drilling tool, the trailing end of the fastening element is contacted by the drilling device, directing hammer-like blow against the trailing end of the fastening element so that simultaneously the fastening element is driven into the borehole being formed by the drilling tool. Due to its configuration, the fastening element is anchored in the borehole. The fastening apparatus carries out a method of directly mounting the fastening element in a borehole, as the borehole is formed by the fastening apparatus.

Fastening apparatus for and method of setting fastening elements

Apparatus (1) for applying marks to surfaces, such as walls and ceilings, particularly for use in home and building construction, includes a photoelectric detector device (21-25) for detecting bundled light signals from a light source, such as a laser, arranged at a distance from the surface to be marked. A signal-generating positioning aid (27-28) cooperates with the detector arrangement (21-25) for enabling a user of the apparatus to position it on the surface based on the detected light signals. In addition, the apparatus includes a marking device for applying a mark to the surface when the apparatus is correctly positioned.

Apparatus for applying marks to surfaces

Mixing device including counterweight

A device for drilling an undercut (1b) in a borehole (1a) in a target material 1, includes an axially extending guide sleeve (13) containing an axially extending eccentric bore, an eccentric bushing (14) is supported rotatably in the guide sleeve and a drive shaft (15) is supported rotatably in the eccentric bushing. A housing (10, 12) laterally encloses the guide sleeve and bears against the surface of the target material. A blocking member (25) is positioned between the housing (10, 12) and the guide sleeve (13) for permitting rotation of the guide sleeve in only one rotational direction relative to the housing (10, 12). Due to the blocking member (25) entrainment of the guide sleeve (13) is prevented when the eccentric bushing is rotated in the direction opposite to the one rotational direction.

Growing community of inventors

Vaduz, Liechtenstein

Martin Noser