Clamping Collar for Hand-Held Machine Tool Accessories
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Solution Overview
Problem
Handheld power tools lack a flexible and easy-to-use accessory attachment system that allows for secure fastening of accessories at multiple positions, limiting user convenience and tool versatility.
Innovation Solution
A clamping neck around the output shaft of the gear unit, designed to accommodate accessories with a form or force fit, which can be angled and has a profiled surface for secure fastening, combined with a spring-elastic clamping ring for easy attachment and detachment, enabling accessories to be fastened in multiple positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional accessory attachment system is used, then the structure is simple, but the ease of operation and flexibility are poor
Solution Approach 1:
The accessory attachment system is segmented into distinct functional components: the clamping neck (18) as the mounting base, the clamping ring (30) as the fastening mechanism, and the accessory elements (56, 62) as removable attachments. This segmentation allows each component to be optimized independently while maintaining overall simplicity.
Solution Approach 2:
The clamping ring (30) is designed with spring-elastic properties, enabling it to dynamically expand and contract for easy attachment and detachment of accessories. The ring can be compressed radially inward for installation and automatically expands to engage with the clamping neck, providing dynamic ease of operation without complex mechanisms.
2Adaptability or versatility
If a fixed accessory mounting position is used, then the manufacturing is simple, but the adaptability and versatility are limited
Solution Approach 1:
The clamping neck (18) features an asymmetric circumferentially profiled outer surface (24) with a groove (54) that creates specific engagement positions. This asymmetric design allows accessories to be mounted at multiple predetermined positions around the output shaft while maintaining simple manufacturing through injection molding or similar processes.
Solution Approach 2:
The clamping neck (18) serves multiple functions: it provides structural support, defines mounting positions through its profiled surface, enables secure fastening via the groove (54), and accommodates various accessory types. This multi-functionality increases versatility without requiring separate mounting mechanisms for each function.
3Reliability
If a secure fastening mechanism is used, then the reliability is improved, but the ease of operation deteriorates
Solution Approach 1:
The spring-elastic clamping ring (30) is designed to automatically engage with the clamping neck (18) when compressed and installed. The elastic force self-generates the securing action, eliminating the need for additional fasteners, tools, or complex locking mechanisms. The ring maintains reliable fastening through its inherent elastic properties while allowing easy manual attachment and detachment.
4Adaptability or versatility
If multiple accessory positions are allowed, then the versatility increases, but the device complexity increases
Solution Approach 1:
The clamping neck (18) utilizes the circumferential dimension around the output shaft to provide multiple mounting positions. The profiled outer surface (24) with groove (54) creates discrete angular positions in the circumferential direction, allowing accessories to be mounted at various orientations without adding axial or radial complexity to the mounting mechanism.
Data Source
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AI summary
The invention relates to a hand-held machine tool, comprising a housing (36) and a drive unit, a gearbox unit which is provided to convert a rotary motion of the drive unit into an oscillating motion (10) and has an output shaft (12), and a tool holder (14) for fastening at least one tool (16), said tool holder being drivable in an oscillating manner via the output shaft (12) the gearbox unit. According to the invention, the hand-held machine tool comprises a clamping collar (18), which extends in a circumferential direction (20) at least partially around the output shaft (12).