Hilti Aktiengesellschaft

Mathias Doberenz

Helmut Burger

Erwin Manschitz

Manfred Ege

Josef Anzinger

Thomas Naumann

A hand-held electrical combination hammer drill capable of being used both as a drilling hammer and as a chisel hammer, and including an actuation member () for actuating an electrical on-off switch of the hammer drill and located on the tool handle switching elements () for switching between drilling and chiseling operations, stop elements () actuated by the switching means () for retaining the actuation member () in a on-position of the on-off switch upon selection of the chiseling operation, and a stop switch () having, upon selection of the chiseling operation, a first position in which the stop switch provides for securing the actuation member () in its on-position with the stop elements (), and a second position in which the stop elements occupies a non-operative position in which the actuation member, upon being released, automatically moves into its off-position under an action of a biasing force.

Hand-held electrical combination hammer drill

An attachment member () for connecting a hand grip with a housing part and a gearbox of an electric hand tool is formed of a flat base plate () for partitioning the housing part and the gearbox relative to the hand grip and formed with a first side () and a second side (). Two passages () form channels for guiding a fastener and extend perpendicularly to the second side () of the base plate (). The attachment member () further comprises two air conveying elements (), which are arranged at an angle to the second side () and each has a curved deflecting section (), which projects from the second side on a radius (R) over an angular range (&#x3b1;). In addition, the attachment member () has a support for a detent spring () for a control knob for adjusting a gearing arranged in the gearbox.

Attachment member

A hand-held electrical combination hammer drill capable of being used both as a drilling hammer and as a chisel hammer, and including an actuation member ( ) for actuating an electrical on-off switch of the hammer drill and located on the tool handle switching elements ( ) for switching between drilling and chiseling operations, stop elements ( ) actuated by the switching means ( ) for retaining the actuation member ( ) in a on-position of the on-off switch upon selection of the chiseling operation, and a stop switch ( ) having, upon selection of the chiseling operation, a first position in which the stop switch provides for securing the actuation member ( ) in its on-position with the stop elements ( ), and a second position in which the stop elements occupies a non-operative position in which the actuation member, upon being released, automatically moves into its off-position under an action of a biasing force.

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Kaufering, Germany

Mathias Doberenz