Sit to Stand Assist for Elderly
Introduction
A low-cost, modular assistive device designed to help elderly individuals stand up safely without external support. The device can fit on any existing chair, doesn’t require electrical power, and maintains user dignity by enabling independent mobility instead of caregiver dependence.
My contribution included problem research, ergonomic measurements, ideation, mechanical design, analysis, and prototype development.
Extensive field observations and interviews with seniors and caregivers highlighted the difficulties of standing up from low seating for individuals with knee arthritis, weak quadriceps, and balance issues.
Market gaps were clear: current solutions are bulky, expensive, and often stigmatizing.
This insight shaped the goal—a universally retro-fittable solution that blends into everyday furniture, keeping dignity and affordability central to design.
Patent & Competitor Study
A structured patent study was done to map existing solutions such as powered lift chairs, walkers with lift arms, and spring-based supports.
Key findings:
-
Most products work only with specific chair geometry
-
Powered solutions cost 30–70k+ INR
-
Visually medical, leading to stigma
This analysis validated the innovation gap for a low-cost, non-electrical, modular, aesthetic solution.
The final design strategically avoided restricted mechanisms and ensured IP-safe originality
Concept Development & Mechanism Design
Multiple concepts were sketched and evaluated for stability, geometry, and ease of use.
The final concept used a spring-assisted mechanical lift that stores energy when the user sits and returns it during standing—reducing required knee force without abrupt motion.
My role:
-
Ergonomic calculations
-
CAD modelling
-
Defining leg positions, armrest angles, and force vectors
-
Safety and fall-prevention considerations
Engineering Analysis: FEA & Spring Force Study
To ensure safety and reliability, I performed structural analysis on the frame components and tested multiple springs to achieve gradual assist, not a sudden lift.
Simulations ensured:
-
Safe load handling for 120+ kg
-
No structural deformation under repeated use
-
Comfortable force curve for elderly users
This allowed precise selection of material, thickness, and spring stiffness before prototyping.
Functional Prototype & Usability Testing
A working prototype was fabricated using cost-efficient materials and tested with users across various chair types.
Results:
-
Significant reduction in user effort while standing
-
No electrical requirement
-
Easy to attach, detach, and clean
-
Users reported increased confidence and independence
-
This validated the engineering assumptions and built the path toward a low-cost production-ready model.
