Captive Cord Safety Shutoff for Treadmill Trip Mechanism
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Solution Overview
Problem
Existing pull cord safety mechanisms for exercise machines are prone to misplacement, require straight-angle pulling to function effectively, and fail to shut off the machine during unstable user interactions, leading to potential injuries and unnecessary power consumption.
Innovation Solution
A captive cord safety system with a trip mechanism housing, featuring a flexible cord, a peg, a shuttle, an electrically conductive shunt, and an indicator ring that allows the machine to shut off when the cord is pulled, regardless of the angle of force application, and can be reset by pushing a button or ring, ensuring the system remains attached to the exercise device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional separable key and pull cord system is used, then the safety mechanism can be removed or misplaced, but this leads to loss of the key and failure to shut off the machine during emergencies
Solution Approach 1:
The patent combines the separable key and the pull cord into a single integrated safety mechanism. The cord is permanently attached to the housing, eliminating the need for a separate key that can be lost or misplaced. This integration ensures that the safety function remains reliably attached to the exercise device while maintaining ease of operation through the cord-pull interface.
2Reliability
If a traditional straight-angle pull cord mechanism is used, then the mechanism is simple in structure, but it fails to shut off the machine when pulled at angles during unstable user interactions
Solution Approach 1:
The patent employs a dynamic trip mechanism where the cord attaches to a movable element within the housing that can respond to pulling forces from multiple directions. Instead of requiring a fixed straight-angle pull, the mechanism dynamically adjusts to the direction of the pull force, allowing the cord to effectively trip the safety switch regardless of the angle at which the user pulls during an emergency or instability event.
3Reliability
If the cord is made permanently attached (captive), then misplacement is prevented, but the cord may become tangled or difficult to attach to user clothing
Solution Approach 1:
The safety mechanism is segmented into distinct functional components: the permanently attached captive cord within the housing, a separate clothing clip for user attachment, and the trip mechanism inside the housing. This segmentation allows the cord itself to be permanently fixed (preventing misplacement) while the clothing clip remains a separate, easily attachable component that the user can quickly secure to their clothing without dealing with a tangled cord.
Data Source
AI summary
A pull cord safety system, primarily for use with an exercise device such as, but not limited to, a treadmill, that provides for a captive cord which is fixed to the exercise device via a trip mechanism housing. This provides for the benefits of a pull cord safety shutoff where the treadmill shuts off if sufficient force is applied to pull the cord, but keeps the system from being a separable key system. Thus, it eliminates misplacing the key and provides for a system which can more easily be triggered regardless of the angle of fall or instability.