Multistage spindle drive for converting rotary motion into linear motion

摘要: A multistep spindle drive is provided for converting a rotary movement into linear with different speeds of withdrawal and extension. The includes at least two threaded spindles, which telescopically mesh each other are in connection one another, nut. inner connected to crank, the nut support wheel via pipe. internal existing between spindles has smaller diameter lower pitch than external outer extension changed over based on greater frictional force. friction-increasing coupling member arranged spindles. spring-loaded can be set changing friction.