Backdrop and backdrop stone
The backdrop and the sliding block together form a technical sliding joint . In contrast to the straight sliding joint, the sliding track (the backdrop) is curved. The sliding in the mostly circular sliding link block performs a rotation of a last remote fictitious point, while the pivot point of a straight moving sliding block is located at infinity.
This machine element formed from a backdrop and a sliding block is known from the controls used in steam engines . It is named there, not because it wouldn't work without it, but because it created a particularly elegant construction. The alternative would have been two physically rotating but rather large components ( gear rods ).
A more recent application of this machine element is in so-called power cutters .
In transmission technology, this element is an example of element expansion .
It is named after tracks for moving stage scenery .
Link control : Link K and link block KS have their current common pivot point at the top left outside of the two eccentrics E and E1
Power side cutter : The common pivot point of the two pliers levers is near the inner ends of the two cutting edges
Instead of the material pivot point at the bottom right and the disc (or rod) as a gear element, a piece of a circular path and a sliding block within it are sufficient.
