Movable or removable closures – Plural wings radiate from common pivot; i.e. – revolving – Successive position-type; e.g. – turnstile
Patent
1996-01-04
1998-01-06
Johnson, Blair
Movable or removable closures
Plural wings radiate from common pivot; i.e., revolving
Successive position-type; e.g., turnstile
49 46, E06B 1108
Patent
active
057041636
DESCRIPTION:
BRIEF SUMMARY
This is a 371 continuation of international application No. PCT/AT94/00056 filed Mar. 4, 1994, now international patent number WO 94/25720.
The invention concerns a turnstile with a housing, a drive shaft and barrier arms coming off it, offset at an angle, each of which extends in the blocking position approximately at right angles to the direction of passage, with a drive motor, which can be set in motion without contact, especially after checking the right of entry of a passing user, in order to turn the next barrier arm of the turnstile into the blocking position, as well as a process for controlling it.
Such a turnstile can be inferred from AT-B 389 736, for example. Proximity sensors, not explained in greater detail, with a switching distance of approximately 5 cm recognize the presence and speed of the person passing and set the drive motor in motion, so that the turnstile is driven at a speed adjusted to the speed of passage. Since each barrier arm must be equipped with a proximity sensor, and the signals emitted by the respective sensor must be transmitted via the rotating shaft into the housing, the design is relatively complicated and problem-prone.
From SU-A 1-476 507, a turnstile is known in which a network of light beams is formed under the cone described by the barrier arms which complements the turnstile. The turnstile has a brake, whereby the turnstile can be locked in any position desired, wherein no certain blocking position must be determined, since the network of light beams recognizes an unauthorized passage in every case.
The task of the invention is to create a simpler design and greater operating safety for a turnstile that goes on when an authorized passerby approaches.
The invention achieves this by assigning an optical electronic sensor to the area of the blocking position.
As soon as the user walks into the detection range of the optical electronic sensor, which preferably covers an angle of 20.degree. maximum, the turnstile drive is turned on. The sensor is installed above and below the drive shaft in the housing, so that the signal can be transmitted to control the motor in the usual way over permanent lines.
One preferred embodiment provides for the optical electronic sensor to have at least one light scanner that responds to reflective changes in a beam of light emitted and that is equipped with a filter for outside light or background. The detection beam emitted is reflected by the passing user. The reflected light hits the first light receiver, which compares the portion of light received with that portion of light that is reflected on a second light receiver from the background further away. Since the positions of both light receivers are adjustable, the range of the detection beam can be limited by determining the distance between its point of intersection and the reflective beam of the second light receiver. This process of finding the difference is largely dependent on reflective properties. The light scanner preferably emits infrared light.
One initial embodiment of the turnstile provides that the blocking position of the barrier arm be in the middle of the detection range of the optical electronic sensor. In this case, the optical electronic sensor includes two light scanners, whose detection beams are at a small angle on both sides of the barrier arm. This embodiment has the added advantage that the direction of passage can easily be reversed, so that such a turnstile can be used for entries and exists by simply reversing the controls. In each case, the turnstile drive is only put into operation when the first light scanner in the direction of passage responds; on the other hand, if the second light scanner responds first, a brake can be activated.
A turnstile released on the basis of a positive check should be set in rotation by the user as soon as he is ready to go through it, so that the motor is then driven at the expected time. With the turnstile in WO-A 93/03251, therefore, after pressing on the barrier arm of the released turnstile first, only a turning on a
REFERENCES:
A. S. Zyuzin, "Automated Check point Turnstile." Soviet Patent Abstracts, SU 1476-507A, Mar. 28, 1990 (Derwent Publications Ltd.).
Cohen Curtis
Johnson Blair
Skidata Computer Gesellschaft m.b.H.
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