Classic Rocker

1
Classic Rocker

• Thomas Dabrowski
• Sarah Philo
• Adam Rauwerdink

2
Outline

• Introduction
• Design Specifications and Constraints
• Benefits of Product
• Competitor Products
• Initial Designs
• Final Design
• Components of the Final design
• Budget
• Conclusion

3
Introduction

• What is the Classic Rocker?
• Mechanized legless rocking chair
• National Science Foundation funding
• Passionworks Studio
• Various mental and physical disabilities
• Coordination, muscle control, cognitive abilities

4
Design Specifications and Constraints

• Rocking Mechanism
• Must be safe and comfortable
• Controls
• Interchangeable
• User-friendly for both chair user and caretaker
• Caretaker master controls
• Audio
• Internal speakers
• Play compact discs

5
Need for product

• Caretakers must physically rock the chair
• Need for one caretaker per chair user
• User is dependent on caretaker no sense of
  independence

6
Benefits of product

• Social
• User can rock without caretaker help
• Provides sense of independence
• Enjoyable experience
• Economic
• Fewer caretakers needed if multiple people
  rocking (multiple chairs needed)

7
Competitor Products

• Motorized rocking chair, by Electronic
  Mechanical Assistant Technologies
• The Mechanical Rocking System, a Rensslear
  Polytechnic Institute NSF project

• Various non-mechanized legless video rocker
  products, found at retailers such as Wal-mart and
  Target

8
Initial Designs

• Safety
• 120V power must be completely isolated
• Shock and fire hazard
• Angle and speed of rocking
• User discomfort
• Chair stability
• Caretaker master control
• User cannot initiate functions while unsupervised
• Environmental
• Fabric must be durable
• Frequent use
• Easy to clean
• Economic
• Chair must be affordable

9
Initial Designs

• Design One
• Runners under chair
• Linear actuator
• Caretaker controls in back of chair
• Design Two
• Motor and cam system to back of frame
• Hinge mechanism on bottom
• Caretaker control tower
• Design Three
• Chair swing
• Hinge mechanism
• Motor and cam system

10
Final Design

• Motor and cam system
• Hinge attached to both chair and base frame
• Master control tower
• User switches

11
Frame

• Aluminum frame
• 80/20 Extrusions
• Base and chair frame
• Hinge mechanism
• Chair reinforcement

12
Motor

• Dayton 12VDC gearmotor 1Z831
• 5.5 amps drawn when rocking 160 lb person
• 135 in-lb torque at 80 RPM
• 1/6 HP
• Geared to 20 RPM

13
Cam and Gear System

• Cam
• 1.4 diameter
• Gear system
• Geared down motor using 12 and 50 tooth gears
• Largest gear is 14 behind the chair frame
• Moving parts covered for safety

14
Link System

• Link
• 3/8 X 32 inch threaded rod
• connected to cam and chair frame
• Linkage Pivot
• Connects linkage bar to chair frame
• Pivot block connected to bearing block then link
• Connected to cam
• Cam pin connects to bearing block then link

15
Complete Motor Assembly
16
Power

• Meanwell S-240-12
• 12 VDC
• extension cord plug
• Rated 18 A
• 216 W

17
Controls

• User
• Touch switch
• Squish switch
• Overridden by master switches
• Interchangeable
• Plug in under caretaker control tower
• Control stand
• Caretaker
• Master controls, including master power
• CD player
• Variable speed
• Caretaker control tower

18
Master Controls
19
Wiring Schematic
20
Audio

• Boss Audio CD-3020 player installed in tower
  behind chair
• Speakers inside headrest of chair

21
Completed Chair
22
Control Schematic
23
Conclusion

• Fully mechanized rocking motion no need for
  caretaker to physically rock the user
• Simple controls for use by individuals with
  mental/physical disabilities
• Durable and strong rocking mechanism
• Safety throughout electrical and mechanical
• Enjoyable and relaxing

24
Acknowledgements

• Engineering Machine Shop Rich and Serg
• Prof. Christian Davis
• Linens n Things - discount
• Christopher Liebler
• OKW Jeff Duchess

25
The End.

• Questions?