Freedon Concepts Drive Mode Mechanism
Bibliographic record
Abstract
This report marks the completion of phase one (design) of the Drive Mode Mechanism project submitted by Freedom Concepts Inc. for the MECH 4860 –Engineering Design course at the University of Manitoba. The second phase (prototype) will begin in January 2019and will be completed in April 2019. Freedom Concepts Inc. is a Winnipeg based company that designs and manufactures adaptive tricycles and mobility devices for people living with disabilities. The company has tasked the student design team with the development of a tool-free mechanism to accomplish two separate drive modes for the rider (freewheel and direct drive) and that is compatible with all current tricycle models. The current mechanism being used on the tricycles relies on frictional contact between four set screws and a standard freewheel sprocket to toggle between the two modes. Although functional, actuation requires the use of a tool and has proven too cumbersome for the average caregiver. The design team conceptualized a two-way ratchet mechanism capable of supporting a freewheel and direct drive mode with a single switch actuation. This concept was developed through research, concept development, and feedback from the client and the course advisor. The mechanism consists almost entirely of laser cut sheet metal and off-the-shelf components from McMaster-Carr® to reduce low-volume production costs and facilitate design changes in the prototyping phase. The estimated cost of the prototype design is$133.99.Tomeet the requirements set by the client, the design features two spring loaded pawls, one of which can be rotated away or toward an internal gear profile using a switch to support the freewheel or direct drive modes. The sprocket can be easily interchanged with any of the 18, 22 or 26-tooth variations to deliver all three pedaling difficulties that a customer may order. To maximize the lifespan of the device, the design is supported by a full stainless-steel construction, sealed bearings and maintenance plan. Included with the final design is a detailed installation procedure, bill of materials, cost breakdown, preliminary failure modes and effects analysis, and a complete package of preliminary drawings including all three custom sprocket sizes. These deliverables fulfill all requirements of...
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.000 | 0.001 |
| Bibliometrics | 0.002 | 0.000 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.002 | 0.003 |
| Open science | 0.002 | 0.002 |
| Research integrity | 0.002 | 0.001 |
| Insufficient payload (model declined to judge) | 0.137 | 0.035 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".