DE504713C - Thread contact arrangement - Google Patents

Description

Thread contacts are known in which the thread tension and its balancing force through two centrifugal masses that can be shifted against each other are recorded, creating a symbolless play of threads to avoid false alarms as a result of slow tension or change in length of the threads, e.g. B. under the action of changes in air temperature and humidity, to prevent. The inertia of the masses serves as a symbol, by only by sudden load surges, z. B. by touching the threads by someone else's hand, etc., which all slow down Movements following unity of the masses is destroyed and the diverging Groups trigger a working contact. Such devices, which in known Formed by two pendulums swinging around different pivot points,

ao have the disadvantage that false alarms can still arise when at gradual rearrangements the common center of gravity of both masses shifts, whereby an unstable equilibrium occurs immediately.

Now the new point of application creates, be it the balancing force, be it the own gravity itself, an additional torque, which is an unintended Evokes signing. Furthermore, working contacts are inexpedient because the permanent monitoring and follow-up control of the Investment is difficult. The well-known use of gravity as a balancing force is necessary that too is an undesirable dependence of the device on the suitable position Signless thread play in pendulums is too little for practical purposes.

The enumerated drawbacks are made by the subject matter of the present invention eliminated by both centrifugal masses as closed bodies of revolution with the same Axis of rotation are designed and carefully balanced individually, so that both the individual The center of gravity and the center of gravity as well as the common center of gravity remain unchanged in all rotational positions. It is used as a balancing force the rotation component of a coil spring is used, such as e.g. B. is supplied by a resilient unrest, so that the sign contact can be designed as a normally closed contact.

By designing the device in the manner described, the thread play is a result the arbitrary number of possible revolutions of both rotating bodies unlimited, whereby an unintentional moment of force can never occur. The idea of the invention also remains, if instead of inertia another purely negative force, z. B. one through Air plumes, braking force generated by electrical eddy currents, is switched on.

5Ö4713

An example embodiment of the

Thread contact arrangement show Fig. Ι to 6, while Fig. 7 is a use of the Thread contact arrangement illustrated schematically.

Figs. 1 and 2 show the new thread contact arrangement in two different longitudinal sections,

Fig. 3 in view with partially broken protective cap,

Fig. 4 in cross section along the line AB in Fig. 2, the

Fig. 5 and 6 in two correspondingly deeper cross-sections.

The thread roll 4 made of wood, insulating plastic or the like. Is here with its storage rack 8, 9 by means of trunnions above in a bearing yoke 2 and below in a sleeve 3 of the Base ι easily rotatable. In the space between the lower one Part of the thread roll 4 and the plate 9 connected to it by the columns 8 is the axis 5 of a serving as a contactor, under the action of a spiral spring 7 standing wheel 6 easily stored.

The quiescent current flows from the terminal 10 through the fastening screw! 1 in the bearing block 2 and from the upper journal of the thread reel 4 via a line 12 in a contact fork 13. A contact pin 14 of the contact wheel 6 makes contact at rest with the contact fork 13 and conducts the current to the lower journal of the Thread roll 4 via bearing bush 3 to the other connection pole 15.

With slow or uniform rotational movement of the thread roller 4, z. B. by gradual Lengthening or shortening of the laid thread 16, there is no change in contact, in this case no power interruption between the parts 13, 14, since the contact wheel 6 is rotated evenly. -

With a jerky rotation of the thread roller 4, z. B. by suddenly touching the tensioned thread 16, however, the contact wheel 6 makes a deflection deviating from the rotational movement of the thread roller 4, the contact pin 14 being temporarily removed from the contact fork 13 and the quiescent current is momentarily interrupted, triggering the alarm device. A stop pin 6 _a is used to limit the deflection of the contact wheel 6.

To monitor the correct action and setting of the contact arrangement, a control contact 18 is provided, over which one end of the release thread 16 must be placed when the contact arrangement is put into operation. To protect the sensitive parts of the contact arrangement _{, they are} surrounded by a sealing cover cap g a, while the entire contact arrangement including the cord roller 4 is closed with a cap 20 apart from the corresponding thread openings, which is attached to the column 17, which is also part of the control contact 18, by means of a Screw 19 is removably secured.

Apart from all other areas of application of the inertial contact arrangement with thread release according to the invention, the same enables a perfect alarm protection of shutters, curtains and the like, e.g. B. according to the schematic arrangement in Fig. 7.

The release thread 16 is in this case via a system of loose or fixed rollers 24 or 25 out, attached at one end at 27 and in the vicinity of the other end over the thread reel 4 of an inertial contact arrangement out according to the invention with a weight 29 ending.

On the axes of the loose rollers 24 securing threads 23 attack with one end, while the other ends z. B. on a roll-up rod 21, 22 of a shop window curtain o. The like. Are attached.

Sudden movements or changes in tension of the securing threads 23 are transferred to the trigger thread 16 and from there to the contact arrangement 4 and effect the alarm triggering, while false alarms due to the described inertia effect of the contact arrangement during transmission uniform thread movements can be safely avoided.

If necessary, several such thread contact arrangements can be used to increase security used one after the other in conjunction with one or more strings.

The particular type of design of the inertial contact arrangement can vary and differ from the example described. In practice, for. Belly the arrangement according to Fig. 7 can be used reversed, so that the roll-up rod 21 comes to lie on top.

Claims (6)

Patent claims: 1. Thread contact arrangement using the inertia of the two pulling the thread and flywheel masses embodying the balancing force, characterized by the choice of a common axis of rotation and perfect balancing of the masses. iao 2. Thread contact arrangement according to claim i, characterized by the choice of closed rotating body as flywheels and rotating spring force as Balancing force. 3. thread contact arrangement according to claims 1 and 2, characterized by Training of the signal generator as a normally closed contact. 4. thread contact arrangement according to claims r to 3, characterized by two different rotatably arranged masses, one of which (4) is connected to the thread (16) and the a contact part (13) carries, while the other is made of a balanced resilient unsteady wheel (6), stored in or on the first mass (4) and with the other contact (14) is provided. 5. Thread contact arrangement according to the Claims 1 to 4, characterized in that the two can be displaced relative to one another Masses (4, 6) normally in a relative position causing the contact closure to one another by a Spring (7) o. The like. Be held, but the tension force is less than that in the case of sudden changes in length or the like. of the thread (16) acting inertia not in connection with the thread standing mass (6). 6. In the thread contact arrangement according to claims 1 to 5 a thread breakage device, Consists of a control contact part (18) against which the tensioned thread rests and the one in the event of a thread breakage under spring action or the like for the purpose of issuing an alarm current connection or opening caused. 1 sheet of drawings