Telescopic Handle Radial Support Mechanism
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Solution Overview
Problem
Handheld devices with telescopic handles experience partial instabilities in the guidance of the inner part within the outer part when forces are applied transversely to the longitudinal axis, particularly in rotary angle ranges where radial support is insufficient.
Innovation Solution
A support element is coupled to the inner end of the inner part, providing radial support through longitudinal displacement within the outer part's guide, allowing for stable guidance and support across a large rotational angle range without requiring the support element to rotate relative to the outer part, and enabling the same components to be used for both rotatable and non-rotatable devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the inner part is allowed to rotate relative to the outer part over a large angular range, then the device can operate in different orientations, but radial support becomes insufficient in certain rotational positions causing instability
Solution Approach 1:
A support element is introduced as an intermediary component between the inner part and the longitudinal guide. This support element provides radial support at the inner end of the inner part without being rotationally coupled to it, allowing the inner part to rotate freely while maintaining stable guidance through the support element's interaction with the longitudinal guide.
2Reliability
If a rotatable support element is used to maintain radial support during rotation, then guidance stability is improved, but the device complexity increases
Solution Approach 1:
The support function is segmented from the rotational function. The support element is separated into an independent component that does not rotate with the inner part, but instead remains radially supported by the longitudinal guide while allowing rotation of the inner part relative to it. This segmentation eliminates the need for complex rotatable support mechanisms.
Solution Approach 2:
The support element serves multiple functions: it provides radial support to the inner end of the inner part, allows longitudinal displacement during telescoping, and permits rotational movement of the inner part without requiring the support element itself to rotate. This multi-functionality simplifies the overall mechanism.
3Adaptability or versatility
If different components are used for rotatable and non-rotatable devices, then functional requirements are met, but manufacturing costs increase
Solution Approach 1:
The support element and longitudinal guide form a universal mechanism that works for both rotatable and non-rotatable device configurations. The same components can be used across different device types, with the support element providing radial support in all cases while allowing or preventing rotation based on the specific device requirements.
Data Source
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AI summary
The device e.g. motor driven lawn trimmer, has a telescopic shank arrangement including an internal part that moves relative to an external part (AT) in a direction of longitudinal axle (LA) in a longitudinal guide (LF). The internal part rotates around the longitudinal axle over a rotatable angle region. A supporting element is arranged on an inner end of an internal part, where the internal part supports an external part opposite to the guide relative to the internal part. The supporting element is coupled to a longitudinally moving unit of the internal part relative to the external part.