Dual-Sequence Tooth Rack for Quiet Running and Overload Locking
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Solution Overview
Problem
Existing double-toothed arrangements in furniture fittings and pull-out devices face challenges in achieving a balance between smooth running and locking safety, often resulting in noise during normal operation and inadequate locking during misuse or overload.
Innovation Solution
The design features larger teeth in one sequence that permanently engage with another tooth-bearing body, while smaller teeth in the second sequence run idle during normal operation to minimize noise, engaging only during misuse or overload to ensure locking, with softer tooth jackets and harder cores for reduced noise and enhanced locking functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If both sequences of teeth are designed to engage during normal operation, then locking safety is improved, but noise level increases and smooth running deteriorates
Solution Approach 1:
The tooth-bearing body is segmented into two distinct sequences of teeth: a first sequence with larger teeth for permanent engagement during normal operation, and a second sequence with smaller teeth for idle running. This segmentation allows each sequence to serve its specific function - the first sequence ensures smooth running and basic locking, while the second sequence remains disengaged during normal operation to minimize noise but can engage during misuse or overload to provide additional locking safety.
2Reliability
If teeth are designed for permanent engagement to ensure locking function, then locking safety is improved, but wear and noise increase
Solution Approach 1:
Different regions of the tooth-bearing body are given different properties: the first sequence of teeth has larger dimensions and is designed for permanent engagement with appropriate material properties, while the second sequence of teeth has smaller dimensions and is designed to run idle during normal operation. This local differentiation in tooth size and engagement behavior reduces wear and noise during normal operation while maintaining locking functionality where needed.
3Object-affected harmful factors
If smaller teeth are used in the second sequence to reduce noise, then noise level is reduced, but locking capability during normal operation is weakened
Solution Approach 1:
The second sequence of smaller teeth is preliminarily positioned in an idle state during normal operation to minimize noise and wear. However, these teeth are pre-configured to engage automatically when misuse or overload occurs, providing preliminary locking capability exactly when needed without interfering with smooth normal operation. The offset arrangement ensures they are ready to engage if the first sequence fails or under abnormal conditions.
Data Source
Figure 1
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AI summary
A tooth-bearing body comprising a first sequence (1) of teeth (2) and at least one second sequence (3) of teeth (4), wherein the teeth (2) of the first sequence (1), viewed in a rolling direction (5) of the tooth-bearing body, are arranged behind one another and the teeth (4) of the second sequence (3), viewed in the rolling direction (5) of the tooth-bearing body, are likewise arranged behind one another, and the first sequence (1) of teeth (2) and the second sequence (3) of teeth (4) are arranged in a transverse direction (6) orthogonal to the rolling direction (5), particularly exclusively next to one another, wherein the teeth (2) of the first sequence (1) are larger than the teeth (4) of the second sequence (3).