Elastic Cord Resistance Device with Interchangeable Handles
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Solution Overview
Problem
Conventional resistance training devices are limited in versatility and durability, lacking a reliable mechanism to prevent the cord from stretching beyond a safe length and requiring replacement if the handle or tube breaks, with no effective solution for using interchangeable handles or straps to change the workout load.
Innovation Solution
A resistance training device with interchangeable handles and straps, featuring a tethered clip system at each end of the cord, a structurally reinforced tether, and a limit mechanism to prevent excessive stretching, allowing for various exercises and adjustable resistance levels without bulkiness or interference with workouts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If handles are directly secured to the tube, then the device is simple in structure, but the tube cannot be used with different handles or straps and cannot be secured to stationary objects
Solution Approach 1:
The device is divided into separate modular components: the elastic tube, handles, straps, and door anchor are distinct pieces that can be independently selected and combined. This segmentation allows users to interchange different handles and straps with the same tube, significantly improving versatility while keeping each component relatively simple in design.
Solution Approach 2:
The elastic tube is designed as a universal component that can be used with multiple types of handles, straps, and door anchors. The standardized attachment mechanism (loops at ends of tube) allows any handle or strap to be connected to any tube, creating a multi-functional system where one tube can serve many different exercise purposes.
2Ease of operation
If the tube is stretched beyond its capacity, then the user can achieve greater range of motion, but the tube breaks
Solution Approach 1:
A door anchor is provided as a preliminary safety mechanism that can be secured to stationary objects before exercise begins. The door anchor includes a rigid structure with a predetermined break point that will fail before the elastic tube does, preventing the tube from being stretched beyond its capacity. This preliminary protective measure allows users to achieve full range of motion while protecting the tube from breaking.
Solution Approach 2:
The door anchor acts as a protective cushion or safety buffer between the user and the elastic tube. By providing a rigid anchor point with a controlled failure point, it cushions against the harmful effect of excessive stretching, allowing the tube to operate within safe limits while still enabling full exercise range of motion.
3Reliability
If a safety sleeve is mounted over the elastic member to prevent over-stretching, then the tube is protected from breaking, but the device becomes bulky and obstructive
Solution Approach 1:
Instead of adding a safety sleeve that would increase the volume and create bulkiness, the safety function is extracted and implemented separately through the door anchor. The door anchor is a distinct component that provides over-stretching protection without being mounted on or adding to the elastic tube itself, thus maintaining a compact and non-obstructive tube design.
Solution Approach 2:
The door anchor serves as an intermediary protective element between the user and the elastic tube. Rather than modifying the tube with a safety sleeve, the door anchor mediates the force transmission, providing a controlled failure point that protects the tube from over-stretching while keeping the tube itself clean, compact, and easy to store.
4Reliability
If the handle or tube breaks, then the device must be replaced, but this increases cost
Solution Approach 1:
The device is segmented into replaceable components (handles, straps, door anchor) and a durable tube. When a component breaks, only that specific component needs to be replaced rather than the entire device. The door anchor's designed break point protects the expensive tube from failure, and handles and straps can be independently replaced if needed, significantly reducing replacement costs.
Solution Approach 2:
The door anchor is designed as a sacrificial component with a predetermined break point that will fail before the tube does. When the door anchor breaks, it absorbs the damage and protects the tube from failure. The broken door anchor is discarded, but the tube and other components are recovered and can be reused with a new door anchor, reducing overall replacement costs.
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
The device provides a cost-effective, versatile, and safe resistance training system that prevents cord breakage by allowing interchangeable components and adjustable resistance, enhancing muscle strength and tone with a range of exercises.
Implementation Method 1
at least one elastic, elongated and hollow cord 12... The cord 12 comprises a rubber or rubber like material having a predetermined level of elasticity
Data Source
AI summary
A resistance training exercise device, system and method having at least one elastic, elongated and hollow cord with a tether secured to each end of the cord and a limit band in the 3 cord to limit the length that the cord may be stretched.