Talk:Babyproof door knob lock

From DDL Wiki

We received your report, and you have some interesting results, but we would like to see some additional detail in a few areas. Comments follow:

• Please include a picture of the product at the top of the document We have added a picture at the top of the page
• Good intro in executive summary, but please put your findings and conclusions up front so that we don’t have to dig for them. The executive summary has been edited to reflect these comments
• Good description of basic customer needs, but it may help to list more depth on issues such as safety, durability, etc. Additional issues such as safety and durability addressed
• A functional description detailing how the doorknob works appears to be missing. Such a description, with a figure to aid explanation, would make the functionality much more clear. We added a figure to help explain the function of the doorknob.
• Great parts list - are the parts of unknown use unnecessary? Is the inner doorknob a single component or an assembly? Is every component of quantity 1?
• Interesting thoughts on DFMA - do you have suggestions for improving the latch design for assembly?
• Your FMEA is just a data table - what are your major findings and recommendations? Findings and Recommendations have been added under the FMEA section
• Would an increased tab size improve friction force for turning the knob? Friction force is normal force times mu - surface area doesn’t seem to be part of the equation...The tab issue is now addressed in the FMEA section
• Is there also a possibility of children working the cover off of the doorknob - or on the other hand adult users having difficulty removing the cover from the doorknob?
• The explanation of quantitative analysis appears reasonable, but the actual numbers appear to be missing. What are the estimated forces for this design?
• How would incorporation of the doorknob cover into the doorknob itself reduce manufacturing emissions from your LCA? As mentioned at the end of DFE, toxic and greenhouse gases are the largest contributing factors in both sectors. However, emissions from plastic manufacturing are an order of magnitude higher than those for metal. Therefore, if the plastic covers could be eliminated altogether and are incorporated into the actual doorknob, emissions averages will decrease.