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I am new to design engineering (but im a mechE), I am manually testing a locking mechanism which the previous engineer left behind (see pic - i cropped a lot to show the important bits). The left side is the leg and the right side would the main body, the handles at top and bottom on the leg turn a shaft which pulls the pin and initiates the lock. I am using belville washers in a series-parallel arrangement to get the force I need. (someones done the calculation previously and found the arrangement) However, I only tested this 50-100 times and the handle became difficult to turn/lock/unlock. I checked the internal shaft/locking pin and washers to see if anything wore, but nothing. I tried changing washer arrangement slightly (put a plain washer at the end etc.) but nothing helps, the handles get tougher to turn until I give up expecting the plastic handles to break. I am now thinking the belville washers could be the reason, maybe the repetition is causing them to grip the pins, causing friction possibly? I think this because whenever i dismantle them to check, the locking works OK for the next 15-15 turns. There shouldn't be any lateral movement as manf. tolerances are good and the handles movement don't give leeway to anything like this. Hope someone could take a look :) Thanks in advance. [link] [comments] |
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