MDI Mechanism Design and Improvement

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MDIMechanism Design and Improvement
Door Hold Open Mechanism
Team Members Jud Long Jonah Stauffer David
Arthur Luke Shaffer April 15, 1999
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Project Description

• Improve Existing Hold-Open Mechanism For Door
  Closer Product Line

• Reduce Manufacturing Costs

• Ensure Design Life Of At Least 100,000 Cycles

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Progress To Date

• Committed To A Final Design For Manufacturing
• Calculated Forces To Meet Design Requirements
• Purchased Necessary Hardware
• Finalized Pro/E Model Of Design

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Model To Prototype
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Progress, cont...

• Manufactured Working Prototype
• Tested Hold Open Force
• Shipped Prototype To Dorma For Cycle Testing

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Completed Prototype
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Anatomy of Prototype
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Design Manufacturability

• Machining Operations
• Straightforward Milling and Turning

• Welding
• Simple, But Not Desirable For Mass Production

• Possible Difficulties
• Pin and Stem Orientation
• Embrittlement of Cylinders From Welding

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Testing of Prototype

• Desired 35-45 pounds hold open force
• Actual 37 pounds hold open force

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Future Intentions

• From Dorma
• Receive Testing Results
• Get Quarter Door Setup For Project Showcase

• Remanufacture Any Worn Components

• Investigate Alternative Manufacturing Methods
• Casting To Reduce Machining Time
• Laser Welding To Improve Cylinder Attachment
• Balls Versus Cylinders On Soffit Plate