초록 ▼

A hand-held tool, such as a hammer drill or chipping hammer, includes a housing with a driving unit for supplying the driving force for the tool with the driving unit generating vibrations. A handle is mounted on the housing and is displaceable in the direction of the main vibration axis. A stop for

A hand-held tool, such as a hammer drill or chipping hammer, includes a housing with a driving unit for supplying the driving force for the tool with the driving unit generating vibrations. A handle is mounted on the housing and is displaceable in the direction of the main vibration axis. A stop for the forward movement of the handle is provided by an electromagnet. The electromagnet is formed by a yoke, an armature and a magnetic coil and exerts a controlled constant force on the handle and the housing independently of the position of the handle relative to the housing. The electromagnet can be controlled depending on the position of use of the hand-held tool.

대표청구항 ▼

A hand-held tool used as a hammer drill, a chipping hammer or the like, comprising a housing having a first end and a second end disposed in spaced relation, a driving unit in said housing supplying the driving force with the driving force acting in the direction from the second end toward the first

A hand-held tool used as a hammer drill, a chipping hammer or the like, comprising a housing having a first end and a second end disposed in spaced relation, a driving unit in said housing supplying the driving force with the driving force acting in the direction from the second end toward the first end of said housing and generating vibrations acting along a main vibration axis extending in the direction between the second and first ends of said housing, a handle mounted on the second end of said housing and being displaceably supported in the direction of the main vibration axis between two stops spaced apart in the direction of the main vibration axis, wherein the improvement comprises that said two stops comprises a first stop means on said housing in the region of the second end of said housing for limiting movement of said handle toward said housing and a second stop means within said handle spaced in the main vibration axis direction from said housing for limiting movement of said handle away from said housing, and an electromagnet located within said handle between said first and second stop means and exerting a force acting counter to the driving force of said driving unit, and means are provided for maintaining the force of said electromagnet constant within a portion of the entire displaceable movement of said handle.