This was my version of a nutcracker which I designed and prototyped to be injection moulded in polyacetal. Several metal parts formed the mechanism.


I based the action on a typical mastic-gun mechanism. The (fly-back) release was spring-loaded using the same lever seen at the front of this picture.
Please excuse the poor quality images, they are rephotographed (digitised) from paper prints.
Although parts were eventually injection moulded (and could be snapped together with integral 'undercuts' minus those crude 'U' shaped clips), I never got to see the finished article. I was informed by a colleague however, that they were 'perfect' for cracking lobster claws.
The acid test for a nutcracker would surely be opening macadamia nuts?
BTW, there are more even poorer images in my nut-cracker photo album.
Sam