Category: Health Care∨g=

Ergonomic Swivel Chair Lock

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---- PROTOTYPE --------- PURPOSE: To create a prototype a swivel ergonomic chair with a controlled locking mechanism to control the swivel feature of the chair for an individual with musculoskeletal issues. A young man found that he would inadvertently swivel his chair seat relative to his torso and the twisted posture exacerbated his existing musculoskeletal problems. The man wanted the ability to lock out the swivel as well as have the option to swivel the seat when getting in and out of the chair. He also wanted to adjust the chair’s height within a modest range. The young man had good arm and hand function and reach range. The solution involved mounting matching parts to both the upper and lower telescoping halves of the lift cylinder through the use of split shaft collars to grip these tubular elements. The upper section held a downward facing L-bracket that could slide away from the center shaft but was pulled inward by a spring. The lower section was a disc that had multiple cutouts around its perimeter that matched the width of the L-bracket. A handled connected to the sliding bracket was designed to allow the user to latch the bracket in its outward most position or permit it to move freely. To use, the user reached down and moved the handle horizontally to its full forward or back position, as a result the L-bracket would be drawn outward, away from the notches in the disk, and the two halves of the lift cylinder would be drawn in by its spring to ride on the edge of the disk as the seat rotated until it matched up with the notch, whereupon it would slide into the notch and the two sections would lock together and prevent rotation. The vertical length of the L-bracket allowed for approximately 3 inches of height adjustability. A 0.25-inch anti-lock brake system (ABS) was used for ease of fabrication and proved to be suitable for the task. Cost for parts under $50 and did not include the time for design and fabrication of various prototypes. AUTHOR: Ray Grott. TITLE: A Means to Selectively Lock Out or Allow the Swivel Feature of an Ergonomic Chair. JOURNAL: Accommodations, Computers, and Communication: Show and Tell – RESNA 2013. REF: The RET Project, San Francisco State University.


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