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Rifton Chair Knee-Prompt

Rifton Chair Knee-Prompt. Customer: Lincoln Development Center Contacts: Cathy Ripmaster & Michelle Gallery Sponsor: GVSU School of Engineering. Introduction. Problem Definition Design Criteria Patent and Internet search Current “State of the Art” Design & Features

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Rifton Chair Knee-Prompt

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  1. Rifton Chair Knee-Prompt Customer: Lincoln Development Center Contacts: Cathy Ripmaster & Michelle Gallery Sponsor: GVSU School of Engineering

  2. Introduction • Problem Definition • Design Criteria • Patent and Internet search • Current “State of the Art” • Design & Features • How does design fulfill the design criteria? • Cost Estimate

  3. Problem Definition • Students have impaired muscle control • Practice sit-to-stand maneuver in Rifton Advancement Chair • Spend time just sitting in Rifton Advancement Chair

  4. Problem Definition • Design a part that supports both knees of a user while sitting and while performing a sit-to-stand in the Rifton Advancement Chair

  5. Design Criteria • Support a person’s knees weighing up to 225-lb while performing a sit-to-stand • Support a person between 53-72 inches • Adjustable in all directions

  6. Design Criteria • Prevent knee movement left/right, up/down • Prevent sliding while seated • Knee pad placed directly over the knee • Comfortable and ergonomic

  7. Design Criteria • Modular • Usable with large, medium and small Advancement chairs • Usable with or without all current Advancement chair accessories. • Accessible mounting attachments • Easily detachable • No tools • Preferably with one hand. • Manufacturability

  8. Patent and Internet Search • Many different Ideas of knee type restraints were found with different types and styles of prompts for the knees • Most designs found that were similar to our design, were similar in that they were to support the knee, different in that they used a single stationary bar type construction which would not move easily out of the way • The adjustment piece for the knee support had a patent that was found that looked quite similar to the design that we were going to built except that it had many extra pieces and was much more complex than what was required for our design. • There were no designs for knee prompts that were found that were in a two piece design similar to that which we are making, or that would be able to be easily moved out of the way for easy access to the person standing.

  9. Patent and Internet Search • The adjustment piece for the knee support had a patent that was found that looked quite similar to the design that we were going to built except that it had many extra pieces and was much more complex than what was required for our design. United States Patent: 5,980,435

  10. Patent and Internet Search cont. • The other chairs that used the knee prompt device where more geared for only standing with no accessibility to the person doing the standing • There were no designs for knee prompts that were found that were in a two piece design similar to that which we are making • The Knee Prompts have no way of being moved out of the way for the person in the device. United States Patent: 4,119,164

  11. Patent and Internet Search cont • There were also devices that were made for sitting to standing movement, but did not have the support that was required for the design • There were also devices for assisting standing, that would be portable, but were not made specifically for one device like the prompts that we are developing United States Patent: 3,629,880 United States Patent: 5,366,036

  12. Patent and Internet Search cont • There were also devices that were made for sitting to standing movement, but did not have the support that was required for the design • There were also devices for assisting standing, that would be portable, but were not made specifically for one device like the prompts that we are developing United States Patent: 3,629,880 United States Patent: 5,366,036

  13. Current “State of the Art” Designs • Strap Leg Restraint • Currently used on military stretchers • Easy to adjust for different size legs • Inexpensive

  14. Current “State of the Art” Designs • Medical Leg Holder • Used for holding a persons leg while using medical equipment • Manufactured by many different companies all with somewhat different designs

  15. Current “State of the Art” Designs • Knee Brace Restraint • Adjustable to different sized legs • Adjusts to the bending of a persons leg

  16. Current “State of the Art” Designs • Zeta Chair • Similar purpose as the Rifton Advancement Chair • Currently has leg restraints

  17. Design - Overview

  18. Design – Kneepads

  19. Design – Kneepads

  20. Design – Knee-Pad Attachment

  21. Design – Knee-Pad Attachment

  22. Design – Attachment to Chair

  23. How does the design fulfill the design criteria? • Design Criteria • Support up to 225-lb person while performing a sit-to-stand • Solution • Design is strong enough to support a 225-lb person below the knee during a sit-to-stand

  24. How does the design fulfill the design criteria? • Design Criteria • Support a person between 53-72 inches • Solution • Adjustable in vertical direction in this envelope

  25. How does the design fulfill the design criteria? • Design Criteria • Adjustable in all directions • Solution • Rifton attachment adjustable up/down, left/right, and angular adjustment • Attachment adjustable in/out

  26. How does the design fulfill the design criteria? • Design Criteria • Prevent knee movement left/right, up/down • Solution • Shape of knee-pad prevents movement

  27. How does the design fulfill the design criteria? • Design Criteria • Prevent sliding when sitting • Solution • Knee prompt is rigid when locked in place

  28. How does the design fulfill the design criteria? • Design Criteria • Knee-pad placed directly over the knee • Solution • Knee-pad supports area directly around knee

  29. How does the design fulfill the design criteria? • Design Criteria • Comfortable and ergonomic • Solution • Knee-pad does not put pressure on patella • Knee-pad is shaped to conform to user • Knee-pad is sufficiently padded

  30. How does the design fulfill the design criteria? • Design Criteria • Usable with large, medium, and small chairs • Solution • Attaches to all size chairs • Different knee-pads for smaller chairs

  31. How does the design fulfill the design criteria? • Design Criteria • Accessible mounting attachments • Solution • Knee-pad and adjustable bar accessible • Attachment under chair may be difficult • Similar to L-bar attachments?

  32. How does the design fulfill the design criteria? • Design Criteria • Easily detachable • Solution • Knee-pad is identical to arm prompts • Adjustable bar is easily removable with a pin • Attachment under chair may be difficult • Similar to L-bar attachments?

  33. How does the design fulfill the design criteria? • Design Criteria • Manufacturability • Solution • Attachment bars can be fabricated in Keller machine shop • Rifton attachments can be purchased • Knee-pads need to be fabricated elsewhere

  34. Preliminary Cost Estimate

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