There's a simple way to lift a platform a short distance:
- Identical discs are mounted on a frame at the four corners of a platform such that front pair of discs' axes of rotation are colinear, as are those of the back pair. The front and back axes are parallel.
- Each corner of the platform (at rest) is mounted to its disc at the same offset (and angle) from the disc's center.
When you lift one end of the platform, all of the discs have to turn identically, so the platform rises parallel to its at-rest position.
What is the formal name (e.g. crank-slider) of this mechanism?
I've been searching the Internet for parts and keep coming up with harrows and cultivators (farm equipment for plowing).
EDIT I'm building a rack to store eight snowmobiles in two rows - one above the other. I have maybe an inch to spare width-wise, so the solution has to be fairly thin, and the ceiling is already too low. Fortunately, the top row can sit below the tallest bits of the bottom row (the windshields and handlebar loops can project into the upper level without being run over). But the back halves of the upper decks need to lift 4-8" to allow sleds to move into the lower level. Discs are not only thin, but their rotation when the deck is fully lowered could be at an angle where raising the deck could combine pushing with lifting, rather than just pure lifting. When raised, their rotation would be just past 12o'clock so they are "locked" by gravity, and "unlocked" with a slight pull. (The decks would be unloaded when raised and lowered, else they would require power and vertical clearance that I don't have.)
I'd rather find a manufactured thin-disc-on-a-thin-bearing but I have no idea what it would be called.
Thanks for any help.