Pneumatic Bladder Seating Cushion for Immersion-Based Postural Support
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Solution Overview
Problem
Cushioned seat bottoms with pneumatically adjustable bladder systems often fail to achieve the desired level of immersion for effective pelvis rotation and stabilization, leading to lower back pain, especially when the bladder system occupies a large horizontal area.
Innovation Solution
A pneumatically adjustable bladder system with a foam-filled bladder under the ischial tuberosities and expansion chambers under the thighs, connected by air passageways, allowing for vertical compression and expansion to optimize immersion and support, while minimizing horizontal area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the bladder system occupies a large horizontal area, then it provides sufficient support coverage, but it fails to achieve the desired level of immersion for effective pelvis rotation and stabilization
Solution Approach 1:
The bladder system is divided into multiple independent bladders (typically three bladders arranged in a triangular pattern) rather than a single large bladder. This segmentation allows each bladder to independently adjust and provide focused support, achieving the desired immersion level without requiring a large horizontal area. The segmented configuration enables precise pressure distribution under the ischial tuberosities and thighs.
Solution Approach 2:
The invention transitions from a two-dimensional horizontal expansion approach to a three-dimensional vertical compression approach. Instead of increasing horizontal area to provide support, the system uses vertical compression of multiple smaller bladders to achieve the necessary immersion depth. This dimensional shift allows the bladders to provide sufficient support coverage while maintaining a compact horizontal footprint.
2Reliability
If the foam filled bladder is made compressible and expandable in vertical direction only, then it optimizes immersion control, but it restricts horizontal adjustment capability
Solution Approach 1:
The system uses multiple independent bladders instead of a single large bladder, allowing horizontal adaptation through the collective arrangement and independent operation of segmented units. Each bladder maintains vertical compressibility for immersion control while the segmented configuration provides horizontal flexibility in positioning and weight distribution.
Solution Approach 2:
The bladder system incorporates dynamic adjustment capabilities through manual valves that allow users to modify the air pressure in each bladder independently. This dynamic control enables the system to adapt to different body sizes, weights, and seating positions horizontally, while the vertical compressibility remains optimized for immersion control. The system transitions from a static structure to a dynamically adjustable one.
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 system provides effective postural support and prevents lower back pain by ensuring correct immersion and pressure distribution, with the ability to adjust dynamically with weight shifts, reducing the horizontal area of the bladder for improved performance.
Implementation Method 1
the foam filled bladder is compressible under the weight of the seated occupant and is expandable when the weight is removed, and wherein the compression of the foam filled bladder causes air from within the foam filled bladder to be displaced through the one or more air passageways to the or each expansion chamber which then expands
Implementation Method 2
the compression of the foam filled bladder causes air from within the foam filled bladder to be displaced through the one or more air passageways to the or each expansion chamber
Implementation Method 3
wherein the system is air tight and the foam filled bladder is compressible under the weight of the seated occupant
Data Source
AI summary
A pneumatically adjustable bladder system (90) for use in a cushioned seat bottom (24) has one or two rear foam filled bladders (62, 64) for location under the ischial tuberosities of a seated occupant of the seat bottom, and one or more expansion chambers (14, 16) or front foam filled bladders (66, 68) for location under the thighs of the seated occupant. There are air passageways (70, 72, 74, 92) interconnecting the bladders with each other or with an expansion chamber. The system is air tight and the bladders are compressible under the weight of the seated occupant and are expandable when the weight is removed. The compression of a bladder causes air therewith in to be displaced through the air passageways to the expansion chambers or to the other bladders, which then expand. The compression of a bladder under the ischial tuberosities of the seated occupant and the expansion of the expansion chambers or of the other bladders under the thighs of the seated occupant cause the seated occupant to experience a correct level of immersion into the cushioned seat bottom which is desired for effective postural support and prevention of lower back pain.