Foldable Treadmill Upright Locking for Controlled Folding
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Solution Overview
Problem
Treadmills with upright posts face safety hazards due to sudden collapse during the transition from a locked to an unlocked-folded state, primarily caused by gravity, which compromises safety and convenience.
Innovation Solution
A treadmill design featuring a movable upright post connected via a movable connector that allows rotation relative to the running deck and belt assembly, incorporating a locking mechanism with chucks and a locking member to control the upright post's position, enabling stable folding and suspension at various angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the upright post is locked in a fixed position, then the treadmill structure is stable during use, but the storage space is insufficient
Solution Approach 1:
The upright post is designed to be dynamically adjustable between a locked state (perpendicular to the running deck) and an unlocked-folded state (at an acute angle to the running deck). This dynamic transformation allows the treadmill to transition between stable operational configuration and compact storage configuration, resolving the contradiction between structural stability and storage space requirements
Solution Approach 2:
The connection between the upright post and running deck is segmented into discrete locked and unlocked positions through the movable connector with chucks. This segmentation allows the structure to maintain stability in the locked state while enabling complete folding to the acute angle position for compact storage
2Volume of moving object
If the upright post is unlocked for folding, then the storage space is improved, but the safety is compromised due to sudden collapse
Solution Approach 1:
The movable connector with chucks is designed to maintain engagement with the upright post during the folding transition. This preliminary action of keeping the locking mechanism engaged prevents sudden collapse while allowing controlled folding to the acute angle position, thus maintaining safety during the storage configuration transition
Solution Approach 2:
The movable connector acts as an intermediary mechanism between the upright post and running deck during the folding process. It provides controlled movement and maintains safety through chuck engagement while enabling the transition to the folded state, preventing direct uncontrolled collapse
3Reliability
If a locking mechanism is added to control the upright post position, then the safety is improved, but the device complexity increases
Solution Approach 1:
The locking mechanism is designed to be self-servicing through spring-loaded chucks that automatically engage with the upright post. The spring force provides automatic locking without requiring additional actuators or complex control systems, maintaining safety while minimizing device complexity
Solution Approach 2:
The locking function is extracted as a separate movable connector assembly with chucks that can independently engage and disengage from the upright post. This modular extraction allows the locking mechanism to be simple and focused on its safety function without being integrated into a complex overall structure
Data Source
AI summary
A treadmill includes a running deck and belt assembly and an upright post. The upright post is movably connected with the running deck and belt assembly through a movable connecter, and the upright post is configured to rotate relative to the running deck and belt assembly around the movable connecter which serves as a fixed point, to allow the treadmill to have a used state and a folded state during rotation.