Movable or removable closures – Processes
Patent
1993-03-24
1994-10-18
Kannan, Philip C.
Movable or removable closures
Processes
49 32, 49 47, E06B 300
Patent
active
053556305
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a procedure for controlling a turnstile for the cyclical release of a walkway, with an associated control system or the like, said turnstile incorporating a plurality of blocking arms that are displaced at an angle relative to each other, each of which defines a blocking position, with a drive motor, and an angle of rotation identification system, and in which, after a positive result to monitoring, each blocking arm is first rotated by the application of an external force, and then by the drive motor, as well as to a turnstile that can be controlled by said procedure.
BACKGROUND OF THE INVENTION
A turnstile of this kind, which locks in the stop position, such as is described, for example, in WO-A-90/8875 is provided with a torsionally elastic coupling that permits a slight amount of rotation despite the fact that the blocking arms are locked, and is monitored by an angle of rotation identification system. In one embodiment, the locked stop position is held by an electric motor which, once the control system permits passage, is rotated further into the next stop position after the user pushes against the turnstile. In the event of illicit rotation the motor is not started but reinforced by a mechanical brake.
A turnstile that is similarly powered by a motor is described in DE-C-38 31 056; in this, the motor is started after an impulse that is provided by the user. A brake is triggered electrically so as to act counter to any illicit rotation.
A further turnstile with access control, in which the stop position is fixed by means of an electronically controlled brake, is described in GB A2 186 618. In the event that unimpeded passage is to be provided, slow and continuous operation by means of a motor can be effected.
In the case of monitored passageways that provide for controlled passage by turnstiles, on the one hand the behaviour or the customary actions of the users, and, on the other hand, specific safety criteria, have to be considered. A turnstile that is released as a result of positive monitoring may not be rotated immediately by a motor; rather, it must be rotated by the user as soon as he is ready to pass through it. In this case, the rotation of the turnstile that has been released is effected by the pressure of the user's body against the blocking arm, when the locking resistance must be overcome. Only the overcoming of this locking resistance indicates, on the one hand, readiness to pass through, and, on the other hand, the correct position of the user, so that the subsequent motorized movements takes place at the anticipated time. Overcoming the locking resistance can be problematic, not only for children, but also, in particular for adults at the access points to T-bar ski lifts, when it must not be forgotten that the following blocking arm swings into position behind the user.
SUMMARY OF THE INVENTION
It is the task of the present invention to create a procedure for controlling a turnstile and a turnstile that is controlled by said procedure, which better meets the demands imposed upon it. According to the present invention, this has been achieved in that when the results of monitoring are positive, each blocking arm is moved from the blocking position into a subsequent stop position and in that after the application of an external force it is rotated out of the stop position until the next blocking arm is in the lock position.
The introduction of a stop position that is located after the lock position ensures that if the results of monitoring are positive, the blocking arm is first moved into the stop position, when this movement is not only felt by the user, but is also visible to him. He can then adopt the correct position that makes passage possible without any problems and push against the blocking arm that is again stationary in the stop position, whereupon the blocking arm can be further rotated by means of the motor. However, in the stop position it is not necessary to overcome a great resistance in order to indicate read
REFERENCES:
patent: 3364620 (1968-01-01), Hess et al.
patent: 3497997 (1970-03-01), Sheckells
patent: 3998008 (1976-12-01), Collins
patent: 4020927 (1977-05-01), Collins
patent: 4142620 (1979-03-01), Sheehan
patent: 4581849 (1986-04-01), Schwarz
Kocznar Wolfram
Wallerstorfer Kurt
Kannan Philip C.
Skidata Computer Gesellschaft m.b.H.
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