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The Wingman: Self-Spotting Bench Press
Students:Chris Potts (EE) & Lane Caffaro (ME)
Project Supervisors:Professor John Spinelli (EE) &Professor Jennifer Currey (ME)
Motivation
Health and fitness have become the focus of many Americans Working out and weight lifting
Maximize potential muscle growth Working muscles until failure
Dangerous without a spotter Work until lifter doubts he/she can lift the bar Human spotter will become obsolete Still augment muscle capacity with safety as a priority
Goals
Lifting subjects Inexperienced vs. experienced Age Sex
Parameters Vertical range: 1.2-2 feet Horizontal range: 3-4 inches Weight range: 45-300 pounds Maximum time to lift bar: 2 seconds
Performance Criteria
Free weight system No constraints on barbell’s directional motion Comfortable and unobtrusive grip on the barbell
Human Spotter Provide assistance to the lifter only when it is necessary Recognize when the lifter can no longer lift the barbell
Manual activation by switch or automatic activation by system
Output device Total time and repetitions
Lift barbell and weight Relatively quick manner
Design Requirements
Activation switches Passive state to active, return to passive
Grip switches and sensors Recognize when lifter needs assistance
Electromechanical interface Pressurized air to raise/lower pneumatic
cylinders Output display
Total time and repetitions
Block Diagram
System Design
Switches
Micro switches Placed in “V” Passive to active/Active to
passive Ribbon switches
Bottom and upper conductors separated so pressure completes the electrical contact
Manual activation of system
Unobtrusive Run length of barbell
Sensors
PING))) Ultrasonic Distance Sensors Sonar – pulse transmitted, echo return Range: 0.75 in. – 10 ft.
Barbell Design
Solenoid Valve with Coil
Lifting mechanism Air pressurized pneumatic cylinders Electrical interface
SN754410 quadruple half-H driver interface device Deenergized in upright for safety
Flow Chart Algorithm
Evaluation Parameters
Horizontal = 12 in., Vertical = 1 ft., Time = 2 s. Free weight
Unobtrusive grip No directional constraints
Human spotter BASIC Stamp communicated properly
Micro switches activated by energizing solenoid Ribbon switches deenergize solenoid Sensors deenergize solenoid
Barbell uneven or stationary LCD
Lift barbell and weight Up to 300 pounds successfully
Future Work Wireless
Horizontal sensors
Better mounted sensors
Regulator for amount of weight
Ready beep/System failure alarm
Adjustable vertical range of pneumatic cylinders
Conclusion
Working prototype of The Wingman: Self-Spotting Bench Press
Even without a human spotter he/she can work muscles until failure
Safety is a priority
The Wingman… there to take the fall so you can be the strongest of them all
Questions