Fortune-telling for excavators _ seeing excavators.

What is the telescopic principle of the push rod of toy manipulator?

1, sequential telescopic mechanism-each section of the telescopic arm is telescopic in a certain order.

2. Synchronous telescopic mechanism-each arm of the telescopic arm expands and contracts at the same relative speed.

3, independent telescopic mechanism-each arm can independently telescopic mechanism.

4. Combined telescopic mechanism-When the telescopic arm has more than three sections, any two telescopic modes listed above can be used for telescopic at the same time.

When the push-down mechanism will continue to drive