Doorframe Anchor Exercise System for Nordic Hamstring Curls
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Solution Overview
Problem
There is no effective, affordable, and portable solution for performing Nordic hamstring curls at home without access to a gym, as existing machines are bulky and expensive.
Innovation Solution
A compact, portable exercise system using a foam base, adjustable nylon strap, steel bar, and door anchor that fits any doorway, allowing users to perform Nordic hamstring curls with stability and comfort, and can be set up in under 10 seconds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional GHD machine is used for hamstring curls, then exercise effectiveness is improved, but device size and cost increase significantly
Solution Approach 1:
The patent extracts the essential functional elements of a GHD machine (hamstring curl capability) and removes the bulky frame structure, leaving only the necessary components: a door anchor, strap assembly, and bar. This extraction allows the device to achieve gym-quality exercises in a compact form factor that fits doorways.
Solution Approach 2:
The patent introduces a door anchor as an intermediary element that provides the structural support normally requiring a large machine frame. By anchoring to the doorframe, the system eliminates the need for a bulky stationary structure while maintaining stability and exercise effectiveness.
2Reliability
If a traditional GHD machine is used for hamstring curls, then exercise effectiveness is improved, but cost increases significantly
Solution Approach 1:
The patent employs inexpensive materials throughout the device construction - a foam base instead of metal framing, a simple strap assembly instead of complex mechanical linkages, and a basic door anchor instead of heavy structural components. These cheap components collectively enable gym-quality exercises at a fraction of the cost of traditional machines.
Solution Approach 2:
The patent discards the expensive, complex frame structure and mechanical systems of traditional GHD machines, retaining only the essential functional elements that can be implemented with inexpensive materials. The foam base, strap, and bar constitute a minimal viable system that achieves the desired exercise effectiveness without the high cost of conventional equipment.
3Ease of operation
If a compact doorframe-based system is used, then device portability is improved, but stability may be compromised
Solution Approach 1:
The patent segments the system into distinct functional components: a foam base for stability, a strap assembly for user engagement, a bar for leg placement, and a door anchor for structural support. Each component is optimized for its specific function, with the foam base providing stability and the door anchor providing structural support, thereby achieving both portability and stability.
Solution Approach 2:
The patent uses a foam base as a composite material solution that provides both stability and comfort. The foam material absorbs vibrations and provides a stable platform, while the wide straps (2 inches in width) further enhance stability during exercise. This composite approach to stability resolves the portability-stability contradiction.
4Stability of the object's composition
If wide straps are used for enhanced stability, then exercise stability is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by using wide straps (2 inches in width) specifically at the user contact points where stability is most needed. This localized application of width provides enhanced stability without requiring the entire device structure to be complex or oversized. The wide straps are integrated into the simple strap assembly, maintaining overall device simplicity while achieving local stability enhancement.
Data Source
AI summary
A workout device that allows for at home Nordic hamstring curls using a. doorframe or other immovable object is disclosed.