Design a simple mechanism?

Question

Do it yourself

Hello!
I was asked to draw a similar mechanism in 3D:

We have a cover with holes and a block with pins, which should enter and exit these holes using a piston (straight red arrow). The problem is that this block can rotate around its own axis (shown by the arrows on the left).
What needs to be added (maybe some guides in the center of the block and cover or something similar) so that the pins always line up with the holes? In this case, the block must be free and separate from the cover.

Answer 1

How many degrees can the block rotate? Those. does it spin back and forth or just all the time in one direction?

Answer 2

If you increase the thickness of the cover, then you can round the ends of the pins and make guide grooves in the cover with a slope of 25-30+ degrees, this will give sufficient sliding (the higher the angle of the slope of the gutters, the less friction and resistance when connecting parts)

Answer 3

you need to make a lot of holes, make the ends of the shryre rounded, round the entrances to the holes too. then they will always fall into holes, with three darks and pins it’s hard, you need to tighten the cover too much to get into it.
and when there are many holes, the cover must be moved a little to get into it, and it will move due to the rounded ends of the pins and funnels at the exit into the hole.
Are you sure you need pins?

Answer 4

What are the thickness of the cover, materials and tolerances for the difference in the diameters of the hole and the pin?

Answer 5

If the task is to hit the holes without aiming, then yes, the pins can be made rounded, and guide funnels with intersecting edges are needed in the lid.
ps If it's not a secret, what is it and what is it intended for?

Answer 6

Better this way:
There is a guide on the piston along which the fork goes (forward / backward), a soft gasket (spring) is installed between the piston and the fork. The piston constantly rotates with the fork
How it works, I think it’s understandable, the piston begins to put pressure on the fork while turning it. As soon as the match occurs, the fork is pressed into the “socket”
, then technical problems will arise, such as the selection of the stiffness of the gasket (or spring) between the piston and the fork, the need for limit switches to stop rotation, etc.

Answer 7

Install a guide in the center of the spring, similar in shape to a PZ bit, in the cover - a hole in the form of a PZ self-tapping screw, but trihedral. When pressed, the PZ self-centers and the pins will go into the holes. Make a hole in the cover through so that the pins have the opportunity to enter. Pros - pins can be made soft.

Answer 8

Thank you all for the ideas, all the pluses :)

Answer 9

dl.dropbox.com/u/2447766/habr/WTF_2.png Something like this?