Weight Stack Selector Mechanism for Balanced Exercise Apparatus
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Solution Overview
Problem
Existing weight stack assemblies for exercise apparatuses lack efficient mechanisms to balance and engage secondary weights during exercise, leading to uneven weight distribution and potential instability when additional weight is added.
Innovation Solution
A weight stack assembly with a primary weight selector mechanism and a secondary weight selector mechanism that couples a user force receiving member to primary and secondary weights, ensuring balanced engagement of secondary weights in the horizontal direction, allowing for smooth and controlled weight adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If secondary weights are added to provide supplemental incremental weight, then the weight range and versatility of the exercise apparatus is improved, but the balance and stability of the weight stack during exercise deteriorates
Solution Approach 1:
The weight stack is segmented into primary weights and secondary weights, with distinct selector mechanisms for each. Primary weights provide the main weight increments while secondary weights provide supplemental fine-tuning increments. This segmentation allows independent optimization of each weight type's engagement mechanism, resolving the contradiction by enabling versatile weight selection while maintaining stability through separate, dedicated engagement paths.
Solution Approach 2:
The secondary weight selector mechanism acts as an intermediary between the user's weight selection intent and the actual engagement of secondary weights. It provides a controlled interface that ensures secondary weights are engaged in a balanced manner, preventing instability while enabling the supplemental weight functionality. The intermediary mechanism coordinates the engagement of multiple secondary weights to maintain horizontal balance.
2Measurement precision
If multiple secondary weights are engaged to provide fine-tuned weight adjustments, then the precision of weight selection is improved, but the complexity of the selector mechanism increases
Solution Approach 1:
The secondary weight selector mechanism merges the selection of multiple secondary weights into a single integrated mechanism. Instead of requiring separate engagement actions for each secondary weight, the mechanism combines them into one coordinated operation, reducing the effective complexity while maintaining precise weight selection capability. The merged mechanism handles multiple weights through a unified engagement process.
Solution Approach 2:
The secondary weight selector mechanism is designed with multi-functionality to handle various combinations of secondary weights through a single mechanism design. It can engage one secondary weight, multiple secondary weights, or none, all through the same selector interface, avoiding the need for separate mechanisms for each weight combination and thus reducing overall system complexity while maintaining precision.
3Adaptability or versatility
If secondary weights are engaged during exercise, then the incremental weight options are improved, but the smoothness of the lifting action deteriorates due to potential imbalance
Solution Approach 1:
The secondary weight selector mechanism employs asymmetric design elements to ensure balanced engagement of secondary weights during the lifting action. The engagement geometry and force distribution are intentionally made asymmetric in design to achieve symmetric balance in operation, allowing incremental weight options while maintaining smooth lifting. The asymmetric mechanism compensates for potential imbalances that would otherwise occur with multiple secondary weights.
Data Source
AI summary
A weight stack assembly is for an exercise apparatus. The weight stack assembly comprises a plurality of primary weights and a plurality of secondary weights that are located next to the plurality of primary weights. A head plate is on the plurality of primary weights. A primary weight selector mechanism is on the head plate and is configured to couple a user force receiving member to one or more of the plurality of primary weights. A secondary weight selector mechanism is on the head plate and is configured to couple the head plate to a first secondary weight in the plurality of secondary weights, and to couple the head plate to a second secondary weight in the plurality of secondary weights. The secondary weight selector mechanism is configured to engage with the first secondary weight so that the first secondary weight remains balanced in the horizontal direction when a force is applied to the user force receiving member. The secondary weight selector mechanism is further configured to engage with the second secondary weight so that the first and second secondary weights remain balanced in the horizontal direction when the force is applied to user force receiving member.