Treadmill Guard Assembly with Flexible and Rigid Segments
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Solution Overview
Problem
Home users of treadmills often lack the knowledge and training to safely operate motorized equipment, posing risks due to improper use and maintenance.
Innovation Solution
A guard assembly for treadmills featuring a flexible guard that deforms to allow larger objects to pass while preventing smaller objects from entering the dangerous area under the treadmill, combined with a rigid guard positioned downstream to stop objects that have passed through the first gap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a guard assembly with gaps is provided to allow object removal, then ease of operation is improved, but safety is worsened due to potential pinch points
Solution Approach 1:
The guard assembly is divided into multiple segments including a flexible guard portion and a rigid guard portion, creating distinct functional zones. The flexible portion allows object passage while the rigid portion provides a hard stop, segmenting the safety function to address both object removal and pinch point prevention
Solution Approach 2:
Different portions of the guard assembly have different mechanical properties - the flexible guard portion has high flexibility to allow object passage, while the rigid guard portion has low flexibility to prevent pinch points. This local differentiation of material properties resolves the contradiction between ease of operation and safety
2Ease of operation
If the flexible guard deforms to allow larger objects to pass, then ease of operation is improved, but reliability is worsened due to potential object passage into dangerous area
Solution Approach 1:
The guard is segmented into flexible and rigid portions that work together in sequence. The flexible portion first deforms to allow object passage, then the rigid portion engages to provide a reliable stop, dividing the reliability function into two stages
Solution Approach 2:
The flexible guard acts as an intermediary element between the moving belt and the rigid guard. It mediates the interaction by deforming under object force, allowing controlled passage while protecting the rigid guard and preventing direct contact between objects and the dangerous area
3Ease of operation
If gaps are provided between the guard and belt, then ease of operation is improved for object removal, but safety is worsened due to object entrapment risk
Solution Approach 1:
The flexible guard portion dynamically adjusts its position based on object size and force. It deformable to allow object passage when needed, then returns to its original position to maintain the safety gap, providing dynamic adaptation rather than a static configuration
Solution Approach 2:
The flexible guard portion is implemented as a flexible element that can deform under object force. This flexibility allows the guard to accommodate objects of varying sizes while maintaining the safety function, resolving the contradiction between access and safety
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances safety by preventing objects from being pulled under the treadmill while avoiding pinch points that could injure users, and allows for easy removal of objects that enter the channel.
Implementation Method 1
The flexible guard may be configured to deform when an object larger than the first gap intrudes into the first gap, thereby increasing the size of the first gap
Data Source
AI summary
An exercise machine with a movable belt includes a guard assembly with a flexible guard that extends towards the rear axis and is spaced apart from the movable belt by a first gap and is exposed by the housing body, a rigid guard positioned downstream of the flexible guard with respect to a moving direction of the belt and spaced apart from the movable belt by a second gap, and a channel disposed between the flexible guard and the rigid guard. The guard assembly protects the user from injury and prevents damage to the exercise machine.