Push Handle Unit Arcuate Corner Node Stress Distribution
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Solution Overview
Problem
Existing push handle units for transport trolleys face issues with mechanical stress and damage due to increased forces from protruding handle parts, particularly when used improperly, and lack ergonomic flexibility in grip options.
Innovation Solution
A multi-part push handle unit with free-standing, upstanding gripping units, horizontal attachment pieces, and arcuate corner nodes that minimize mechanical stress through smooth transitions and shared cross-sectional geometry, allowing for adjustable and ergonomic grip options and improved force distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If protruding handle components are added to improve ergonomics, then hand position comfort is improved, but mechanical stress and damage risk increase
Solution Approach 1:
The patent employs curved transition zones and arcuate geometries in the handle structure, particularly at stress concentration points where straight transitions meet protruding components. This curvature distributes mechanical stresses more evenly throughout the structure, preventing stress concentration and reducing damage risk while maintaining the ergonomic protruding handle design.
Solution Approach 2:
The handle unit utilizes composite construction combining different materials with complementary properties - typically a rigid structural core for strength and a more compliant outer layer or coating for stress absorption and ergonomics. This composite approach allows the protruding handle components to provide ergonomic benefits while the overall structure resists mechanical damage.
2Adaptability or versatility
If sliding handle units are used to allow adjustment, then ergonomics and grip options are improved, but reliability under increased force deteriorates
Solution Approach 1:
The sliding handle unit is divided into modular segments that can move relative to each other along defined tracks or guides. This segmentation allows adjustment for ergonomic adaptability while each segment maintains structural integrity. The modular design ensures that forces are distributed across multiple connection points rather than concentrating stress at single sliding interfaces.
Solution Approach 2:
The patent introduces intermediary elements such as buffered sliding interfaces, damping mechanisms, or flexible connection elements between the adjustable handle segments. These intermediaries absorb and distribute forces during adjustment and under load, preventing direct transmission of high stresses that would compromise reliability while still enabling smooth ergonomic adjustments.
Data Source
Figure 1a
Figure 1b
Figure 2
AI summary
The invention relates to a push handle unit (10, 110, 210, 310, 410, 510, 610, 710), in particular a multi-piece push handle unit (10, 110, 210, 310, 410, 510, 610, 710), comprising at least one first and at least one second end piece (12, 14), each end piece (12, 14) having at least one self-supporting grip unit (16) that rises up, at least one horizontal attachment piece (18), at least one arcuate corner node (20), and at least one fastening device (22, 522, 622, 722) for fastening the respective end piece (12, 14) to a transport cart (24) guided by hand, the self-supporting grip unit (16) that rises up consisting at least of one grip unit receptacle (26) and at least of one grip unit insert (28a, 28b; 128a, 128b; 228a, 228b; 528a, 528b; 628a, 628b; 728a, 728b), the horizontal attachment piece (18) and the grip unit receptacle (26) being formed on the arcuate corner node (20) in such a way that a continuous transition between the horizontal attachment piece (18) and the grip unit (16) is formed by means of the arcuate corner node (20).