How does a turnstile work?

How does a turnstile work? 



  • A person can open the passage way with kind of access control systems, card reader systems, remote control systems, biometric systems, ticket accepting devices etc. 
  • It is a post with a number of short poles sticking out from it that have to be pushed round as each person walks through the entrance. 
  • After a person has passed, the turnstile arms locking again immediately. 
  • They can allow only one-way passage or bidirectional use.  
  • In case of fire or any similar emergency situation, free exit option is available. 
  • If a turnstile is lock while power off, it has been called fail secure turnstile. If a turnstile is free while power off, it has been called fail safe turnstile. 

How is a turnstile mechanism? 

  • Turnstiles often use ratchet mechanisms to allow the rotation of the stile in one direction allowing ingress but preventing rotation in the other direction. 
  • A lock up arm (pawl) is used to locking at the turnstile mechanism. 
  • Solenoid pushes or pull the pawls. 
  • A drive spring provides the turnstile arm to return its correct position when passage occurs. Drive spring mechanism has a spring inside its housing used to store mechanical energy. If this spring is compressed more than desired, force applied to turnstile arm rotating force will increase. 
  • Shock absorber provides the smooth operation of the turnstile. Kinetic energy of the arm is absorbed by the shock absorber while arm comes to its original place. 
  • Proximity switches are used to received passage information or position of arms. 
For more information, visit Optima Engineering

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