How does a tripod turnstile mechanism work?
- Barrier Gate
- Tripod Turnstile
- Swing Barrier
- Flap Barrier
- Sliding Barrier
- Arm Drop Barrier
- Speed Gate
- Full Height Turnstile
- Automatic Bollard
- Walk Through Metal Detector
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How does a tripod turnstile mechanism work?
The tripod turnstile entrance control comprises three at equiangular distances spaced barrier arms on a rotatable arm carrier which using a remote control barrier device can prevent or permitted, respectively, to turn in one or two turning directions. Adjacent to the arm carrier there is also a control disk with a track formation extending around its periphery with recesses between triangular cam means, spring-biased positioning means can be derolled in the track formation and against the cam means in order always to keep one of the barrier arms oriented in its home position, i.e. in a horizontal locking position.
The home position of the electronic tripod turnstile is defined by a recess formation with cam means in connection to or formed in the control disk having several recesses corresponding to the number of barrier arms. In general, three triangular cam means and, consequently, three recesses, since the number of barrier arms is three. A spring-biased positioning member is derolled in contact with the cam means. The lock or barrier function of the control disk using the barrier device is carried out by rocker arms activated upon by solenoids and cooperated with the teeth at the circumference of the disk. In addition to the spring-biased positioning members for the fixation in their home positions of the barrier arms of the turnstile hydraulic equipment can be used and the so-called home positions are reached when one of the barrier arms has assumed its horizontal orientation.
The three arms interlock angularly with a hub having a fixed axis and capable in turn of occupying a horizontal position corresponding to the blocking or obstructing of a narrow passage giving access to a controlled area, by which each arm is locked in its obstructing position, at least in one of the two possible directions of its movements about an axis, and to allow on the contrary this arm to be pushed and retracted in the direction considered in response to an appropriate authorization. This retraction of each arm is immediately followed by the following arm of the tripod entrance gate coming into its horizontal obstructing position, the angular spacing between the two successive arms being sufficient to accommodate individually the persons who take the concerned passage: the freeing of the passage then requires a new authorization and so on.
The waist tripod turnstile device is normally in a closed stage meaning that a solenoid holds the mechanism for a turnstile in the home position of the barrier arms. When an admission signal appears in the passage system the solenoid is disconnected so that there can occur a rotation clockwise or counterclockwise in response to the type of control signal coming from the electronic equipment.
The tripod access control gate is supplied with the locking function mechanically disconnected in a home position for any of the barrier arms of the turnstile, also without an unaccepted signal, meaning that the turnstile is normally opened and that, upon acceptance or approval of a signal only the sensor system and the electronic system will check that the passage takes place and that the turnstile, by aid of the positioning member assumes its next home position. The positioning system supplies a clear indication to the electronic system when efforts for unpermitted passage occur, the solenoid concerned then being activated by the electronic system to prevent movement in the unpermitted direction but permit return to the initial position.
Due to this sensor system, an indication confirming that the rotation of the turnstile occurs in the intended direction. The system also gives the electronic equipment a response confirming that the person concerned has passed. When the home position has been reached after a passage confirmation, this solenoid used for the normally closed position will return to its released state.