DE417149C - Alarm contact - Google Patents

Description

GERMAN EMPIRE

ISSUED AUGUST 7, 1925

REICH PATENT OFFICE

PATENT LETTERING

CLASS 74a GROUP

(Sl 37733 νΐΠΐ ₇ 4α)

Max Stewien in Charlottenburg. Alarm contact

Addendum to patent 401155.

Patented in the German Empire on March 13, 1924. Longest duration: September 10, 1941.

The object of the invention is a draft generated on the egg side of excess air pressure

further training of the alarm contact after being achieved even more safely. The device,

Patent 401155, which has the advantage that it is used for this purpose, is shown in the drawing

the problem posed in that patent.
The space to be secured is rendered harmless by a 10

Claims (4)

Partition wall divided and the alarm contact built into an opening in the partition wall. By means of a fan, which is also built into the partition, the air bodies of the two halves of the room are put into a different state of tension, whereby an air flow is generated in the same direction within the wall opening, which is stronger than the counter-movement that occurs as a result of drafts. The alarm contact is now arranged in such a way that only the blasts of air which counteract the air flow and which occur when doors or windows are opened are able to press the oscillating flap against the contact. In order to leave a certain security against the disturbing effect of drafts when the fan is not running, the wall opening is closed on one or both sides by a sieve, which has a dividing and weakening effect on the air flowing through, on the other hand, experience has shown the short blasts of air that occur when doors are opened or windows appear, passes through almost without being weakened. The sensitivity of the device can be regulated by the fact that the openings of the sieve have an uneven size and now, by turning the sieve, either the larger or the smaller holes are brought to the lower edge, where the blasts of air act most effectively on the oscillating flap. The protection of the alarm device against the effects of drafts requires a very fine adjustment of the weight of the oscillating flap and the limitation of the oscillation path of the oscillating flap by the contact. On the other hand, it is necessary to 'press the oscillating flap against the contact with the greatest possible force in order to achieve a reliable electrical connection. The force with which the oscillating flap presses against the contact is greater the closer the contact is to the suspension axis of the oscillating flap. To achieve a reliable electrical connection, the contact is therefore arranged above the center of gravity of the swinging flap. This is also necessary because at the contact point in the event of a power short an adhesion occurs between the oscillating flap and the contact, which makes it difficult for the oscillating flap to fall back. However, this adhesive effect must be neutralized in order to make the oscillating flap receptive to new blasts of air. The nearer . Now the contact is on the suspension axis of the oscillating flap, the more easily the force of gravity of the oscillating flap can bring about the detachment. Fig. Ι of the drawing shows the space to be secured, divided by the partition, ι and 2 are openings in the outer wall filled with doors or windows, 3 is the arm contact built into the partition, 4 the one also into the partition -: built-in fan that creates a flow of air in the direction of the arrow. Fig. 2 shows the; Construction of the alarm contact. 5 is the: pendulum flap, which is suspended in the housing 6 in an isolated manner and through which the fan! generated air flow is pressed against the stop 7 [. 8 is the contact of the electric bell, not shown. 9 and 10 are perforated flaps or sieves. If the pendein de flap 5 is pressed against the contact 8 by a blast of air, the electric current flows through the contact 8, the oscillating flap 5 and the suspension axis of the oscillating flap: 11 to the bell and activates it. IΆ τ ic ν τ -An s v r f c n E: 1st alarm contact according to patent 401155, characterized in that in an opening the partition dividing the room to be secured by means of a fan (4) despite the occurrence of drafts steadily rectified air flow is generated, which counteracts the draft, so that this is also located in an opening of the partition wall movable Konitaktorgan not move in the sense of the alarm, can. 2. Alarm Koratakt according to claim. 1, thereby characterized in that in the wall opening receiving the contact member (5) perforated caps or sieves (9 and 10) are inserted. 3. Alarmkonaakt according to claim 1, characterized characterized in that the air admission to the oscillating flap (5) by changing the free cross section of the wall opening is adjustable. 4. Alarm contact according to claim 1, 1.05 characterized in that the contact (8) is above the center of gravity of the oscillating Flap (5) is arranged. For this t sheet of drawings.