Hilti Aktiengesellschaft

Alexander Funk

Louis Widmer

A square tool holder () for an impact wrench is provided, including an anvil (), on which a drive square () is situated for accommodating a tool, in particular an impact wrench socket, and including a safety bolt () for securing the accommodated tool, the safety bolt () being spring-mounted in the drive square () in such a way that the safety bolt is movable perpendicularly to the axis of rotation (D) of the anvil (), the safety bolt () having a rounded, preferably hemispherical surface ('), which protrudes from a holding surface (&#x2032;) of the drive square () in a state of spring-extension (AZ) of the safety bolt () and is at least partially countersunk in the holding surface (&#x2032;) in a state of spring-compression of the safety bolt (), the safety bolt () being secured against falling out by at least one safety pin (&#x2032;) situated in the drive square ().

Square tool holder and impact wrench

A hand-held machine tool is disclosed. The tool has an electric motor and an output shaft which can be driven by the electric motor about a working axis. The output shaft has an intake space which is open on the output side for receiving a machine tool and which has two elongated holes cutting into the intake space in the radial direction. Blocking elements lie in the elongated holes and protrude into the intake space and are movable between an end on the output side of the elongated hole and an end on the drive side of the elongated hole. The blocking elements abut on a radial stop in the radial direction and are forced into the intake space in an engaging manner. The stop overlaps in a locked position with the ends on the output side of the elongated holes and can be moved in the withdrawal direction against a spring force of a spring for releasing a radial movement of the blocking elements from the engagement with the intake space. A second spring includes a support ring, two bows protruding from the support ring in the withdrawal direction and bent around the intake space in the form of a segment of a circle, and a pin engaging radially from each bow in the withdrawal direction in front of the blocking element into the elongated hole.

Hand-held machine tool

An electric screwdriver is disclosed. The screwdriver has a spindle, a locking body, a radial stop, a strap, and a spring. The spindle defines a receiving area and an oblong hole which is open into the receiving area in a radial direction. The locking body is disposed in the oblong hole, where the locking body is protrudable into the receiving area. The radial stop is engageable with the locking body where, when the radial stop engages with the locking body, the locking body protrudes into the receiving area. A first end of the strap engages behind the locking body on a drive end. The spring is disposed between a second end of the strap and the radial stop.

Growing community of inventors

Schwabmuenchen, Germany

Alexander Funk