Door-Mounted Exercise System With Inelastic Straps
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Solution Overview
Problem
Existing home fitness devices, such as dumbbells, kettlebells, pull-up bars, and door anchors, face issues like cumbersome weight sets, space occupancy, damage to door frames, and instability during use, particularly with inelastic straps that can fall out when the door is opened.
Innovation Solution
A door-mounted exercise system featuring inelastic straps wider than 2.5 centimeters, force-multiplying tightening mechanisms, and cushioning to prevent damage to the door, along with a portable and rugged design that allows for easy setup and use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a door anchor is used to hold straps between a closed door and its frame, then the device can function at any spot on the perimeter, but the anchor may fall out when the door is opened causing serious injury or death
Solution Approach 1:
The door mounting system is divided into separate components: a door mount that attaches to the door itself, and a frame mount that attaches to the door frame. This segmentation allows each component to be optimized for its specific location and function, with the door mount providing secure attachment points that remain reliable when the door is opened.
Solution Approach 2:
The patent introduces a door mount as an intermediary device between the user and the door frame. This door mount acts as a mediator that provides secure anchor points on the door itself, eliminating the need for anchors on the door frame that could fall out when the door is opened.
2Adaptability or versatility
If pull-up bars are placed inside a door frame, then they provide exercise functionality, but they prevent the door from closing by occupying the space that a door would normally occupy
Solution Approach 1:
The exercise functionality is moved from the door frame space (two-dimensional plane) to the door surface (another dimension). By attaching exercise equipment to the door itself rather than the door frame, the system provides exercise functionality without occupying the space needed for door closing.
3Adaptability or versatility
If elastic bands are used with door anchors, then they can be used anywhere on the non-hinge long side of the door, but the anchor must be repositioned by opening and closing the door to change height
Solution Approach 1:
The door mount incorporates adjustable components that allow the anchor points to be dynamically repositioned on the door surface without opening and closing the door. This dynamic adjustment capability maintains placement flexibility while eliminating the time loss associated with repeated door operations.
4Ease of operation
If inelastic straps are used for body weight exercises, then they support suspension exercises, but the straps can fall out when the door is opened causing serious injury or death
Solution Approach 1:
The unsafe door anchor component is extracted from the system and replaced with a door mount that provides secure attachment points. This extraction eliminates the hazard of anchors falling out when the door is opened, while maintaining the suspension exercise functionality through properly secured strap attachments on the door mount.
Data Source
AI summary
Methods and systems are presented in which one or more heavy-duty straps are positioned in contact with a top and bottom of a door and engaged with a heavy mechanism exerting a static tension greater than 10 newtons. A user can exercise using removable extenders attached to any of several loops at various vertical positions, creating enormous leverage along the strap(s). Supplemental cushioning may be utilized to minimize damage from large kinetic energy imbued upon components of the methods and systems during or after exercise.