Reformer Sit Box Foam Structure for Easy Centering and Mounting
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Solution Overview
Problem
Conventional sit boxes for reformer exercise apparatuses are heavy, difficult to handle, and require precise positioning to ensure even support, making them challenging for users to center and securely mount on the carriage.
Innovation Solution
A lightweight sit box with a unitary block-shaped body made of closed cell polymer foam, featuring a rectangular flat top surface, curved walls, vertical recesses for shoulder stops, and cutaway portions for handholds, along with a grid of recesses and grooves for secure mounting and easy handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional sit boxes are made of heavy hardwood plywood to ensure structural strength, then the sit box provides sufficient strength and stability, but it becomes difficult for small users to handle and position properly
Solution Approach 1:
The patent changes the material parameter from heavy hardwood plywood to lightweight closed-cell foam, fundamentally altering the weight characteristic while maintaining structural integrity through the foam's inherent properties and structural design
Solution Approach 2:
The sit box is constructed as a composite structure with an outer shell and inner foam core, combining the structural benefits of a rigid shell with the lightweight and cushioning properties of closed-cell foam material
2Ease of operation
If the sit box is made lightweight to improve ease of handling, then small users can easily manipulate and position the box, but the box may lack sufficient structural strength and stability
Solution Approach 1:
The sit box combines a rigid outer shell structure with an inner closed-cell foam core, creating a composite material construction that achieves both lightweight properties for easy handling and sufficient structural strength for stability and support
3Reliability
If the sit box has a large bottom surface area to securely mount on the carriage, then the box provides stable mounting, but it becomes more difficult to center and position accurately on the carriage
Solution Approach 1:
The patent incorporates preliminary positioning features such as recesses and protrusions that are pre-configured to guide the sit box into proper alignment with the carriage, eliminating the need for manual centering adjustments by the user
Solution Approach 2:
The sit box design includes self-aligning mechanisms where the box automatically centers itself on the carriage through integrated guide features, allowing the system to perform its own positioning function without external intervention
Data Source
AI summary
A sit box for use on a reformer exercise apparatus carriage is a unitary body having a rectangular flat top surface portion joining four curved portions. Each curved portion merges with one of an upright front wall, an upright back wall, an upright left side wall, and an upright right side wall. The walls terminate at a generally flat rectangular bottom parallel to the top surface portion. Each wall curves to merge with an adjacent wall. Each of the left and right side walls has an outwardly open vertical recess therein adjacent the front wall to receive within each recess one of a pair of shoulder stops projecting from the carriage.