Classic Rocker

Team 7Thomas Dabrowski

Sarah PhiloAdam Rauwerdink

Outline

• Introduction• Specifications• Physical Challenges• Market Analysis• Optimal Design• Budget• Timeline• Conclusion

Introduction

• Self-rocking legless rocker• Passionworks Studio in Athens, Ohio• NSF funded• Dr. Hallowell at Ohio University• “Classic Rocker” will provide a smooth,

comfortable rocking motion activated by a simple switch

• Audio system will also be included

Physical Challenges

• Users have wide array of physical and mental limitations

• Cerebral palsy, Multiple sclerosis, varying levels of paralysis• Coordination• Muscle control• Mental abilities and attentiveness• Seizures of varying intensity (some CP)

Specifications

• Rocking mechanism• Comfortable speed• Comfortable range of motion• Does not require permanent attachment to floor

• Control• Simple power switch for user• Control of audio by user• Caretaker has master control for all power and for music track

and volume• All easily accessible and with high ease of use

• Audio• Internal speakers• Input from CD player accessible to caretaker

Market Analysis

• Electronic and Mechanical Assistant Technologies – Motorized Rocking Chair

•NSF Project – Rensselaer Polytechnic Institute – 1989 – “The Mechanical Rocking System”

Market Analysis (con’d)

• Various non-mechanized legless rockers, available at many major retailers (Wal-Mart, Target, etc)

• Numerous patents granted for mechanized rocking systems

Optimal Design

Enclosed Motor and Cam

Linkage Bar

Hinge

CD Player and Chair On/Off

Frame

• Aluminum external and internal frames• External base• Hinge Mechanism• Internal chair reinforcements

Power

• Mean Well SE-600-12 Enclosed Power Supply• Supplies 600-Watts of Power

@ +12V from 0-50A• Compensates for both the

audio system and gearmotor running at full draw without straining

• Actual power supply will provide a lower wattage after CD player power tests are completed

Motor and Linkage

• Dayton 12VDC gearmotor #1L474• 6.5 amps full draw• 150 in-lb torque (41needed)• Geared to 20 RPM

• Cam and linkage system• Cam 1.6” diameter• Linkage bar 5” long• Creates chair displacement of 7” at top

• Moving parts covered for safety

Controls

• 2 Sets – User and Caretaker• User - interchangeable switches for activation

of rocking motion and mute function for audio• Squish switch• Touch switch

• Caretaker – Master power to all chair components, plus control of CD player

Touch Switch Mechanism

Audio

• Boss Audio CD-3020 CD player installed in tower behind chair

• MA Audio HK-35 Speakers inside headrest of chair

Control Schematic

Rocker Power Switch

Caretaker ControlUser Control

Electric Power from Outlet

Interchangeable Rocking Motion

Activation Switches

Two MA Audio HK35

Speakers

Boss Audio CD - 3020

Dayton #1L474 gearmotor 1/15 HP Geared to 20

RPM

600W 12VDC Power Supply

Mute Function

Budget

Part Name Quantity Price Each PriceDayton #1L474 1/15 HP 20 RPM Gearmotor 1 Free FreeMean Well SE-600-12 600W Power Supply 1 $173.95 173.95Linen 'n Things Video Rocker 1 $64.99 64.99MA Audio HK35 Speakers 1 $50.00 50.00Boss Audio CD - 3020 1 $62.00 62.00TFH USA Squish Switch 1 $49.00 49.0030' 1" OD .125" Thickness Aluminum Tubing 1 $125.00 125.00TOTAL 524.94

Budget 750.00

Surplus/Deficit 225.06

• Rest of budget will be used for “error analysis”

Timeline

Timeline (con’d)

Conclusion

• Analysis of forces with scale models and Working Model 2D software

• Preliminary analysis of power needs

• Located optimal audio and electrical equipment

• Frame construction options (Weld or 80/20 Inc.)

Prior Designs

TextText

TextText

Design III

Design I

Design II

Appendix

Related Patent Numbers

• 6,899,393• 6,695,799• 6,412,867• 6,318,803• 6,152,529

Appendix

• Load vs. Input Voltage for SE-600-12 Power Supply

Appendix

A

B

Master Power Control Switch

User Control Switch

AB

User Control Switch

A

B

Rocking Motor

Master Control I

Audio Output

Mute Function

Power Input (From Wall Socket)

AB

A

B

Master Control II

Mute Function