New Handle CAD Design Latch Mechanical Analysis J. Dzionara-Norsen.
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Transcript of New Handle CAD Design Latch Mechanical Analysis J. Dzionara-Norsen.
New Handle CAD DesignLatch Mechanical Analysis
J. Dzionara-Norsen
Handle Redesign
• New handle design to be used with standard crutch frame
• Differences from previous crutch design:– Longer shaft cuffs to account for misalignment
during use– Slide handle onto shaft by removing axillary pad– Modified design handle frame to accommodate
pad– Shorter handgrip to fit standard crutch frame
Handle CAD
Latch Mechanical Analysis
• Cantilevered beam where b=0.2”, h=0.5”• AISI 304 steel• YS = 31,200 psi• F=150 lbf.• F.O.S = 1.73
b
h1”
F
Tearout, Bearing Stress, Shear
• Tearout:
• Bearing Stress: Compressive stress due to surface contact
• Shear of Bolt:
= 2500 psi
= 4167 psi
= 5895 psi
n = 5.3
n = 7.5
n = 12.5
Crutch Misalignment
• Most severe angle is 45 degrees• Maximum y = 1.57”• Handle cuff length and sliding button length
take this into account
𝛼1.57”y