Movable or removable closures – Plural wings radiate from common pivot; i.e. – revolving
Patent
1992-04-14
1993-08-17
Kannan, Philip C.
Movable or removable closures
Plural wings radiate from common pivot; i.e., revolving
49 25, 49 28, E05D 1502
Patent
active
052357830
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to revolving doors, generally. More particularly, the present invention relates to detection devices for controlling the rotation of a revolving door.
BACKGROUND ART
Such a revolving door is generally known.
This known revolving door has the drawback, that when the revolving door has been put into rotation by a drive, a door panel might collide with a person or an object within the passage space.
It is an object of the invention to eliminate this drawback of the known revolving door.
SUMMARY OF THE INVENTION
The revolving door according to the invention thereto is characterized in that one or more sensors are present, these sensors, in the presence of an object within a certain distance of a door panel, may emit a signal, by means of which the drive of the door can be operated by a controlling device.
With the door according to the invention it will in this way be possible to stop the door when an object within the passage space is approached too closely by a door panel.
In an embodiment of the revolving door according to the invention, the sensors are ultrasonic sensors, which are placed generally centrally in the door and are directed along one or more door panels, in such a way that by means of the signal reflected by an object the drive of the door can be operated by the controlling device.
In a preferred manner, the ultrasonic sensors could be placed on the central support, and the sensed area, as viewed in the rotating direction of the door, can be situated in front of a door panel.
In order to have the controlling device, by means of which the drive of the door can be operated, remain unaffected by unwanted reflections, the length of the sensed area of a sensor is limited to a maximum value. Only those reflection signals can be introduced into the controlling device having a reflection time (i.e. the time passed between the transmittal of the ultrasonic signal and the reception of its reflection) below an adjustable maximum value.
In an embodiment of the revolving door according to the invention the controlling device is an electrical or electronic circuit with a filter, by means of which the introduction of a reflected signal with a reflection time longer than the adjustable maximum value is prevented.
By this measure the length of the sensored area can be adjusted to a certain value in a very accurate way.
In a further embodiment of the present invention, the pass value of the filter is adjustable. The pass value of the filter controls the length of the sensed area. The pass value of the filter associated with the sensor can be increased such that the pass value is greater when the door panel approaches a passage opening. By this measure a greater safety is achieved against collision of the door panels with persons that approach the passage opening.
According to a further feature of the revolving door according to the invention the pass value of the filter is adjustable by operating one or more switches, which can be actuated by the rotation of the door. These switches can be placed in different ways in the revolving door according to the invention. In an embodiment of the revolving door according to the invention the switches are mounted onto a door panel and/or the central support and cooperate with cams or similar operating apparatus fixedly placed with respect thereto. These switches may be magneto-switches and the cooperating elements can be magnets.
The invention will be illustrated with reference to a drawing of an example of an embodiment of the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
In the drawing of FIG. 1 a horizontal section of the revolving door is schematically shown.
DETAILED DESCRIPTION OF THE INVENTION
As the drawing of FIG. 1 shows, the revolving door comprises a housing 1, which encompasses, with the exception of two diametrically opposed passage openings 2, the passage space 3, within which the four door panels 4 are mounted onto the central rotatable support 5, which can be operated.
As viewed in the rotating dir
REFERENCES:
patent: Re30719 (1981-08-01), Mills
patent: 4060935 (1977-12-01), Miller et al.
patent: 4295297 (1981-10-01), Carroll et al.
patent: 4697383 (1987-10-01), Hagiwara
patent: 4785580 (1988-11-01), Olesen
Huber Erik J.
Huber Jacob R. A.
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