For a Mechanical Design class project, the goal was to identify and solve a unique problem with a mechanical solution. Dorm rooms have limited storage for skateboards, and over-the-door hooks are space saving mechanisms. Current market designs are designed for lightweight, small boards and do not fit longer boards with wider kingpins to hang from.
Requirements
- Must hold board in deck-to-wall and wheel-to-wall orientations
- Must be easily cleanable and non-degradable due to longboard debris contamination e.g. water, ice/slush, leaves, grit salt etc.
- Must be easy to attach board to hanger and quick to remove when needed for use.
- Must have one-handed operation to quickly hook onto door.
- Must have clearance to still be able to open/close the door without friction from the over-door mount point (material thickness must be minimized with high priority).
- Must be minimal swing in the board when suspended.
- Must fix the board at bottom trucks as well as top, or rigidly constrain the top to oppose any moment generated by the board.
Specifications
- Must support board lengths of up to 50”.
- Must support weight of board (≤15lbf as a generous estimate).
- Location of center of mass dictated by strapping/hooking mechanism, perform testing in weakest orientation.
- Seek redundancy in hooks; one hook should still hold the board. Factor of safety minimum of 2.
- Over-door material thickness must be less than standard door clearance (¼” clearance is common for upper doorframe).
Concept Generation
Finite Element Analysis
Evaluation
