Pistol-Shape Machine Tool Magazine Mounting
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Solution Overview
Problem
Existing hand-held machine tools require significant manufacturing effort and space due to complex assembly and design, making them cumbersome and difficult to handle.
Innovation Solution
A compact design is achieved by adjustably supporting the tool-changing magazine on the drive unit, using a drum magazine with a gear neck to house the gearbox output shaft, and an actuator in the form of an adjusting slide to facilitate tool displacement, allowing for a slim pistol-shaped housing and easy assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex assembly structure with multiple components (transmission output shaft, intermediate gear, tool holder, drum magazine) is used to achieve correct positional assignment, then the machine tool can function properly, but the manufacturing effort and assembly difficulty increase significantly
Solution Approach 1:
The patent combines multiple components into integrated assemblies. The drum magazine is directly coupled to the transmission output shaft, eliminating the need for separate intermediate mounting structures. The tool holder is integrated with the drum magazine assembly, creating a unified structure that reduces the number of separate components and simplifies assembly while maintaining correct positional relationships.
Solution Approach 2:
The transmission output shaft serves multiple functions: it transmits rotational motion to the drum magazine for tool changing, provides structural support for the drum magazine mounting, and acts as a mounting axis for the tool holder. This multi-functionality reduces the need for separate dedicated components, simplifying the overall assembly structure.
2Reliability
If a traditional layout with separate mounting areas for transmission, drum magazine, and tool holder is used, then each component can be properly positioned, but the space required in the machine housing increases considerably
Solution Approach 1:
The patent employs a nested arrangement where the tool holder is positioned within the space occupied by the drum magazine assembly. The intermediate gear is arranged concentrically with the transmission output shaft. This nesting allows multiple components to occupy overlapping or adjacent spatial volumes, significantly reducing the overall housing space required while maintaining proper component positioning and functionality.
3Adaptability or versatility
If the drum magazine is mounted with its axis parallel to the main axis in the front end wall area, then tool changing is enabled, but the machine housing becomes bulky and difficult to handle
Solution Approach 1:
The patent repositions the drum magazine axis from a parallel orientation to a perpendicular orientation relative to the main axis. This dimensional change allows the drum magazine to be mounted in the rear area of the housing rather than the front end wall, creating a more compact overall layout that improves handiness while maintaining full tool changing functionality.
Data Source
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AI summary
A motor-driven machine tool (1) for rotatably driven tools, designed as a hand-held machine tool, has a pistol-shaped basic form in which the motor (4), gearbox (5) and tool changer magazine (6) are arranged one behind the other in the shaft part (2) in the direction of the main axis as a unit, wherein the tool changer magazine (6), which is designed in particular as a drum magazine, is mounted on a neck (24) of the gearbox housing (22) and is penetrated by the output shaft (23) of the gearbox (5).