DE476675C - Circuit for the signaling device for X-ray systems that continuously indicates the activation of the operating current - Google Patents

Description

Circuit for continuously indicating that the operating current is switched on Signaling device for X-ray systems The optical ones prescribed for X-ray systems and acoustic signaling devices that activate the high-voltage current show, are so far set up so that the signal is simultaneous with the high-voltage current is switched on. Accidents can easily occur here because the signal the people in the vicinity of the system from touching the high-voltage lines warns after switching on, but cannot prevent a person from using one High-voltage shock receives around the moment the high-voltage is switched on is in contact.

According to the invention, this deficiency is remedied in that the Signal circuit compulsorily before the primary circuit of the high-voltage transformer is switched on, so that the signal already a certain time before switching on the high voltage sounds or lights up.

For this purpose, for example, if the activation of the Signal circuit and the operating circuit is carried out by two coupled switches, which depend on a common switching lever, one for the operating flow switch Provide tow coupling so that when you turn the hand lever initially only the Signal switch and only a little later the operating current switch is taken along. Instead, you can also couple the two switches, but the mating contacts Arrange so that the moving part of the operating current switch has its mating contact later than the signal switch reaches its mating contact, the one in the direction of movement has such an expansion that the signal switch during the entire switching movement of the operating current switch remains closed. In this case, both of them can Switches may be combined into a single one.

But you can also use the two circuits electrically, for example by a delay relay, make interdependent, such that by means of the Manual switch initially only the signal circuit and the primary circuit of the relay closed and by the latter the high voltage after the delay time has elapsed is switched on.

The figures show two exemplary embodiments.

Fig. Z illustrates an embodiment with a double switch in the simplest version, Fig. 2 an embodiment with switching relay for the high voltage circuit.

In the embodiment of FIG. Z, the switching lever b sits on the axis a lying on one power line and is held in the rest position shown by a spring k in contact with a stop ° g- '. To switch on the high voltage, the switching lever b must be placed on the contact d located in the circuit of the primary coil e of the high voltage transformer e, f. In doing so, it slides along a curved F-rail c, to which a line h , which is parallel to the transformer coil e and contains the signaling device i , leads.

When turning in the direction of the arrow, the switching lever b first comes into contact with one end of the contact arc c, so that the signal circuit is closed. Only when it reaches the other end of the contact arc c does the switching lever d also close the circuit of the transformer coil e by touching the contact d, so that now the high-voltage current in the secondary circuits of the transformer e, f containing the X-ray tube comes into flow without the Circuit of the signal is interrupted. In the on position, the shift lever can be locked by any known means. After release it goes back to the rest position under the influence of the spring. It cannot be intentionally or inadvertently left standing on signal current short after switching off the high voltage.

Instead of the spring k, under certain circumstances, as indicated by dashed lines, a toggle spring k 'can be used, which holds the switch in both end positions.

Leaving the shift lever on the bow c when switching off of the operating circuit can also be made impossible by the switch executes as a rotary switch. It is then switched off by continuing to turn of lever b in the direction of the arrow. The lever leaves approximately at the same time the contact d and the arc c, so that both circuits are switched off. Of course the stop pin g and the return spring k then fall away.

The embodiment described also has the disadvantage that the period between the switching on of the signal circuit and the high-voltage circuit depends on the arbitrariness of the person switching on, who can turn the switching lever faster or slower. In the embodiment of Fig. 2, any arbitrariness is eliminated. Here only switch b for the signal current has to be operated by hand. In the signal current, the electromagnetic coil is connected to a delay relay, parallel to the signal apparatus i , via which the line branched off between signal i and coil m 'leads to the primary coil e of the high-voltage transformer e, f . The relay is shown in the figure as a known type of mercury relay. This includes partially filled with mercury, in the lower parts of the coil na 'surrounded tubes n a floating on the mercury iron body s. In one with the tube n through a capillary tube o associated secondary pipe P contacts are q, r melted down, by a where q is connected to the mains via switch b , while r is connected to the primary coil e of the high-voltage transformer. By closing the current at b , the signal i is activated and at the same time the coil na 'is excited, so that the iron body s is drawn deeper into the mercury. The thereby displaced mercury rises to a higher level in tube n, while the corresponding rise in tube P is delayed by capillary o, so that after energizing coil k a certain time elapses until the relay closes the circuit through e. When using a controllable delay relay, any time interval between switching on the signal and the high-voltage transformer can be set.

When switch b is opened, the interruption takes place at the same time the signal current and the transformer current. Should the level compensation of the mercury when the iron body is re-immersed without delay, it is possible for the Provide a wide passage with a check valve for the return flow from p to n, like is also already proposed for such relays.

Claims (5)

PATENT CLAIMS: i. Circuit for the permanent activation of the Signal device indicating the operating current in X-ray systems through the use of a switching device that puts the signal circuit before the operating circuit closes. 2. Circuit according to claim i, characterized in that the switching of the operating current switch coupled to the signal switch takes place in dead gear. 3. A circuit according to claim 2, characterized in that the switch of the signal circuit cooperates with a contact sheet, on which he during the switching movement of the Operating current switch slides along. q .. Circuit according to Claim 2 and 3, characterized characterized in that the switching device is under the influence of a return spring. 5. A circuit according to claim i, characterized in that in the circuit of a manual switch on the one hand the signal apparatus, on the other hand a switching circuit that switches the operating circuit Delay relay is located whose circuit controlled by the signal circuit is branched off, so that when the switch is closed initially only the signal circuit and only after the time delay caused by the relay, the operating circuit is closed and when the switch is opened, both are interrupted at the same time Circuits takes place.