Winding Guide Device with Arching Bands
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Solution Overview
Problem
Existing guide devices for hand-held machine tools have moderate guiding properties and tend to unwind, posing safety risks due to their thin sheet metal design, which limits their effectiveness and handling ease.
Innovation Solution
The guide device incorporates flexible arching bands with cross-sectional arches that improve bending stability and are designed to maintain their shape when wound or unwound, featuring transverse stiffening bands and a cross-connection system for enhanced stability and ease of use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the guide device is made from thin sheet metal to enable winding and storage, then the device can be stored in a space-saving manner, but the guiding properties deteriorate due to small guiding contour
Solution Approach 1:
The guide device is segmented into multiple longitudinal guide ribs and transverse guide ribs that are integrally formed from the sheet metal. These segmented ribs work together to provide adequate guiding properties while maintaining the ability to wind and store the device in a compact form.
2Ease of operation
If the guide device is made from thin sheet metal to enable winding, then the device becomes portable, but the device tends to unwind itself creating safety risks
Solution Approach 1:
The guide device incorporates preliminary anti-unwinding measures through its integral rib structure and guiding geometry. The guide ribs are designed to engage with the workpiece and tool in a way that prevents spontaneous unwinding during operation, while still allowing the device to be wound for storage when not in use.
3Device complexity
If the guide device uses a simple thin sheet metal design, then the device complexity is reduced, but the guiding properties remain moderate
Solution Approach 1:
The sheet metal is segmented into multiple functional ribs (longitudinal guide ribs and transverse guide ribs) that are integrally formed. This segmentation provides enhanced guiding properties through multiple contact points and contours while maintaining a relatively simple overall structure that can be manufactured from a single sheet metal piece.
Solution Approach 2:
Different regions of the sheet metal are given different local qualities through the rib formation. The longitudinal guide ribs provide guidance in the direction of tool movement, while transverse guide ribs provide stability perpendicular to the movement direction. This local differentiation of structure enhances overall guiding properties without requiring a completely complex design.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides improved guiding properties, reduces the risk of unwinding, and allows for easy handling and storage, enhancing safety and operational efficiency.
Implementation Method 1
the guiding device has one or more flexible arching bands, which have a cross-sectional arch at least in the section that is unwound from the coil, i.e. are arched transversely to the direction of longitudinal extent, which, among other things, improves the bending stability transversely to the direction of longitudinal extent
Data Source
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AI summary
The device (50a) has a guiding contour (60a) along its longitudinal extension direction (54) for guiding a guide base (24a) during machining or marking of a workpiece. The guide base is connected with a hand-machine tool or marking tool. A curved strap (51a) comprises a cross-sectional curvature (53) in an operating position, where the curvature runs transverse to the longitudinal extension direction. Another curved strap and/or a flexible transverse reinforcement strap are arranged adjacent to the former curved strap.