DE373044C - Contact blinds for electrical safety systems with blind cords under the action of a weight - Google Patents

Description

GERMAN EMPIRE

ISSUED APRIL 4, 1923

REICH PATENT OFFICE

PATENT LETTERING

CLASS 74 a GROUP

(F 49130 VIIIJ74a)

Sherlock Society m.b.H. in Berlin.

Contact roller blind for electrical safety systems with under the action of a weight

standing blind laces.

Patented in the German Empire on April 22, 1921.

The present invention relates to one which is independent of weather and temperature influences Contact rouleau, which if the rouleau secured by means of d'es rouleau breaks Disk or when attempting to penetrate through the broken disk or when pulling out objects through this the contact closure for the relevant electrical alarm device, e.g. B. reliably produces a bell.

The construction made according to the invention is as follows:

On a board A, which is attached to the top of the disc to be secured, is a round rod B rotatable at points C ¹ , C ² , on which a disc provided with deep grooves is mounted. The cord E is fastened and wound up on the disc D , by means of which the blind is lowered or opened in a known manner. On the rod B are to the. Digits F ¹ , F ²

ίο etc. Cords G ¹ , G ² etc. attached to which an iron bar H is tied. This rod H pulls down the cords G ¹ , G ² , etc. when lowering due to its gravity. When the cord E is pulled, the immediate rolling of the rod B raises the rod H because the cords G ¹ , G ² , etc. wind up on the rod B.

On the same Brettl a number of contacts P, P , etc. are attached to the angles K ¹ , K ² , which are conductively connected to each other by means of a thin metal rail so that the angle ¹ K ¹ with the metal rail L ¹ and the angle if ² with the Metal rail L ^{2 are} in contact. The cable feeds M \ M ^{2 are} attached to these metal rails.

The construction of the contact P, P etc. is as follows:

A metal sleeve N is soldered onto the angle K ^{1 and} has a shoulder 0 at its lower end. In this sleeve there is a spiral spring P on which a metal disk Q rests. The metal disk Q is pierced. This hole R is precisely matched to the strength of the cord G ¹ , G ^{2, etc.} A knot 5 attached to the top of the cords G aims to keep the cords taut when the blind is lowered. This is achieved in that when the blind is lowered, the cord G slides through the hole R as a result of the pulling action of the rod H and that shortly before the rod has reached the bottom of the shop window, the knot 5 ″ presses on the pane Q. Since the Knot 5 "cannot pass through the hole R , the disc Q gives way and compresses the spring P, whereby the cord remains taut. When the blind is pulled up, the cords G ¹ etc. slide unhindered through the fixed contacts P, P. A freely floating spiral spring T is also soldered to the tube V, which carries a disc V perforated at the point U at the lower end. The disk V is located within a hollow ring W which is attached to the angle K ^2.

The way the contact works is as follows:

The cord G attached to the rod B is drawn through the disk Q and disk V and attached to the rod H as well . When opening or lowering the blind, the cord slides through the contacts unhindered. The contraction or expansion of the cord as a result of temperature fluctuations, moisture, etc. also has no effect on the contact, since the cord slides through the contact disk V unhindered. At most, the spring P is compressed or pulled apart a little more. Pass or only when dismantling the disc or in a \ ^r beseech, between the cords enggespannten G ^1, G ^2, etc. squeeze through any object from the display window, the thread G ^1, G ² is pushed aside. During this lateral movement it takes the disk V with it, and this touches the hollow ring W. When the disk V comes into contact with the hollow ring W , a contact is made which triggers electrical alarm bells in a known manner. The circuit is then closed by the supply line Mi-metal rail!.! - angle i ^ -pipe iV-spiral spring T- disc F-hollow ring W- angle K * -metal rail L ² with its power supply line.

Claims (2)

Patent Claims: 1. Contact roller blinds for electrical security systems with blind cords under the action of a weight, characterized in that the individual blind cords (G ¹ , G ² , etc.) are guided through the center line of a freely floating spring coil (T) and under the action of The load (H) on them keep the spring coils (T) from their mating contact (W) in the resting state, but in the event of danger they allow the alarm contact to occur between the two parts (T, W) due to their sideways displacement. 2. Device according to claim 1, characterized in that the cords (G) with knots (S) rest on discs (Q) penetrated by them, which are under the action of springs (P), for the purpose of temperature and humidity influences to compensate for any changes in the length of the cords (G). 1 sheet of drawings.