Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
2000-03-20
2001-09-18
Hofsass, Jeffery (Department: 2632)
Communications: electrical
Condition responsive indicating system
Specific condition
C340S545100, C340S545200, C340S545300
Reexamination Certificate
active
06292100
ABSTRACT:
The present invention relates to a door warning system and in particular to a system adapted to warn a person approaching a door of the presence of a person on the other side of that door.
For many years doors have caused injuries to persons and damage to objects due to the fact that most doors are not provided with windows and consequently a person about to operate a door from one side cannot determine whether or not a person is on the other side of the door. In situations where a door opens outwardly into an area into which vision is not possible with the door closed there is always the potential that the opening of the door may strike a person on the other side of the door or cause them to drop articles which they may be carrying. The situation is particularly difficult in the case where a door is opened quickly or where a door is capable of swinging into a room or area either side of its jamb. The potential for damage, inconvenience and property damage is further exacerbated when the area into which the door opens is small or lies adjacent a busy work area. Restaurant kitchens are particularly hazardous in this regard.
It is not always practicable to place a window in a door in order that person about to open a door may observe activity on the other side of the door as privacy may be required on one or both of the two sides of the door. In the case where doors are opened quickly it may furthermore be the case that a small window in a door would not be adequate in order that traffic in the area adjacent the other side of the door may be fully observed and assessed particularly if the person requiring to open the door is in a hurry.
It is accordingly an object of the present invention to ameliorate one or more of the above difficulties associated with doors or at least to provide an alternative to existing systems designed to facilitate safe operation of doors.
According to the present invention there is disclosed a door warning system comprising a sensor adapted to sense the presence of persons immediately adjacent a first side of a swinging door; alarm means responsive to the sensor means adapted to advise a person on a second side of the door being opposite the first side of the presence of a person on the first side of the door.
One embodiment of the present invention will now be described with reference to the accompanying drawing being a perspective view of a door fitted with a system in accordance with the present invention.
REFERENCES:
patent: 3560950 (1971-02-01), Peters
patent: 4698937 (1987-10-01), Kornbrekke et al.
patent: 5142152 (1992-08-01), Boiucaner
patent: 5153560 (1992-10-01), Ichikawa
patent: 5745035 (1998-04-01), Deyo
patent: 5819124 (1998-10-01), Somner et al.
patent: 5861806 (1999-01-01), Vories et al.
Cohen & Pontani, Lieberman & Pavane
D2 Technologies Pty Ltd.
Hofsass Jeffery
Tang Son
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