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 ...