- Tripod turnstile is a device that controls the way into or out of a building, room, or area of land, especially one that you have to pay to enter.
- They are also called in different forms like Half Height Turnstile, Waist Height Turnstile, Tripod Waist Height Turnstile, Tripod Half Height Turnstile etc.
- A tripod turnstile is a form of gate which allows one person to pass at a time.
- It can also be made so as to enforce one-way human traffic, and in addition, it can restrict passage only to people who insert a coin, a ticket, a pass, or similar.
- Half Height Turnstiles are very common at train/metro stations, stadiums where used toll collection systems.
- Thus, a tripod turnstile can be used in the case of paid access (sometimes called a faregate or ticket barrier when used for this purpose), for example to access a stadium, or to restrict access to authorized people, for example at the main gate of a facility like power plant, factory, industrial areas etc.
- Half Height Turnstiles can be preferred especially for low security required places.
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How does a Tripod Turnstile seem?
- They have aesthetic and slim body which is made with stainless steel commonly.
- Waist height turnstiles have three arms.
- Half height turnstile bodies are designed for low security places. Because its body has allow jumping to reach inside of place.
- Double Tripod Turnstile is a solution for 2 people passage same time instead of 2 tripod turnstiles placed if less area is available at site.
- LED Matrix lights have been on it for guidance.
How does a tripod 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 tripod turnstile arms locking again immediately.
- Tripod turnstiles 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 half height turnstile is locked while power off, it has been called fail secure half height turnstile. If a half height turnstile is free while power off, it has been called fail safe half height turnstile.
How is a half height turnstile mechanism?
- Waist Height 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 half height turnstile mechanism.
- Solenoid pushes or pull the pawls.
- A drive spring provides the tripod 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 half height 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.
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