Posted on **Awesome new hardware. Question....**

#1 posted 08-02-2012 05:15 PM |
First, keep in mind I’m working (at work) so I’m doing this fast and loose with little checking or fancy calculus and larger static force calculations.
Incorrect. About 87.5 lbs 10” out.
Not true. Disclaimer won’t save you from standards (BIFMA in this case… though I’m not sure if they apply specifically to your type of chair). This hinge is not sufficient. Doubling that hinge (the math may not work out correctly): Commercial-grade furniture is usually tested at (for chair backs) 150 lbs for 1 minute @ 16” distributed via foam block and rope which is followed by a 200 lbs proof load test (can break but cannot catastrophically fail). Translating that quickly, or using your 10” number: I don’t know if your specific chair has to come anywhere close to that standard, but it’s something to consider. Also, for the proof load: These are just quick, simplified calculations and may not apply to what you are doing, but I don’t think those hinges are going to work. If you’re going to risk it, do so with the aluminum or stainless steel ones. If you don’t want any risk, use the steel ones (not stainless). They give you over double the capacity. -- "Well, at least we can still use it as firewood... maybe." - Doss |