Electric combined hand-held power tool

Abstract

The invention relates to an electric hand-held power tool (2). Said compact and easy to handle hand-held power tool (2) comprises an electric drive motor (6), a tool holder (18) that is rotationally driven by said drive motor (6) via a drive mechanism (12, 16) and that is configured in order to accommodate a tool (46, 48, 50) suitable for hammer drilling or hammering, or a tool (46, 48, 50) suitable for rotatingly drilling or a tool (46, 48, 50) suitable for screwing, in addition to a pneumatic percussion mechanism (20) for applying strikes onto a tool (46) inserted into the tool holder (18). According to the invention, the tool holder (18) includes a shank portion (52, 54) for the tool (46, 48, 50) and a holding sleeve (68) with the two end portions thereof to be opened. The inner circumferential surface (88) of the holding sleeve (68) is provided with at least eight planar circumferential surface sections (88n, 88o, 88p, 88q, 88r, 88s, 88t, 88u) in the circumferential direction. Each pair of adjacent circumferential surface sections (88n, 88o, 88p, 88q, 88r, 88s, 88t, 88u) form an angle of 120 degrees.

Description

technical field [0001] The invention relates to an electric hand tool machine according to the preamble of claim 1 . Background technique [0002] Many electric hand-held power tools are known, especially for the home industry market, which are either only provided for drilling, screwing or for hammering, or are designed for a combination of the two mentioned tasks, for example For drilling and screwing or for rotary and percussion drilling. Although known hand power tools are optimally suited for the respective intended use, most are not at all or only poorly suited for other purposes. For example, a drill screwdriver is optimally suited for screwing and drilling, but is not suitable for hammering in stone and concrete and thus drilling, since the tool mounted in the tool chuck cannot be driven by impact . Hammer drills with snap-on impact mechanisms, although covering most of the possible uses in drilling, such as rotary and percussion drilling, can only provide unsatis...

AI Technical Summary

Problems solved by technology

Although the known hand-held power tools are optimally suited for the intended purpose, most are not at all or only poorly suited for other purposes

For example, a drill screwdriver is optimally suited for screwing and drilling, but is not suitable for hammering in stone and concrete and thus drilling, since the tool mounted in the tool chuck cannot be driven by impact

Hammer drills with snap-on impact mechanisms, although covering most of the possible uses in drilling, such as rotary and percussion drilling, can only provide unsatisfactory results when impact drilling in concrete and are also rather inadequate. Lightweight, which makes it difficult to precisely drill small holes in metal and wood and to install a screwing tool when screwing in a screw

Drill hammers are ideally suited for drilling in concrete due to their pneumatic percussion mechanism, but are generally also inconvenient and can therefore only be used to a limited extent for small holes in metal and wood and for turning screw

Images