DE2454162B2 - DEVICE FOR ELECTRIC HIT INDICATION IN FENCING - Google Patents

Description

The invention relates to a device for electrical hit display in fencing, with an electrically conductive vest electrically connected to a hit display device, which is connected to the operating voltage via a vest series resistor, and a foil , which is provided at its tip, for each of the two opponents carries a hit detector, consisting of a foil switch and a plunger that opens the flower table in the event of a hit, one of the two switching contacts of which is permanently connected to the plunger and by means of a line insulated in the foil to the operating voltage via a foil resistor, the other switch contact to the blade. Bell and handle formed foil compound is attached. the operating voltages of both foils and the corresponding vests are polarized in opposite directions.

Such devices are known from practice and with Exception of the feature that the operating voltages of both foils and vests are polarized in opposite directions are, for example in "Electronics". Aug. 1959. p. 114 and 115. If the Florelt switch is opened when the opponent's vest is hit, the electrical connection of the plunger with the foil compound released, and the opposing vest learns through the The electrical ones that come about via the plunger and the foil series resistor connected upstream of it A change in potential in connection with the operating voltage applied to the foil series resistor, which leads to a Tr.'ffersignal in the hit indicator connected to the vest. Touched However, if the person hit during the hit intentionally or accidentally wears his own vest, it will be in spite of the If the vest potential hits the same potential of the foil mass as the device mass held because the direct connection between the foil mass and the vest is much lower resistance is as the connection with the operating voltage of the opposing foil via its series resistor. That constant vest potential does not allow a hit display to come about. So the victim has it in hand to suppress the hit display.

The invention has for its object to design a device of the type mentioned so that a A reliable hit display is also made if the victim wears his own vest during the hit touched with the mass of your own foil, i.e. with its blade, bell or knob.

This object is achieved according to the invention in that with each foil / wipe the foil mass and the device ground a diode is provided, which corresponds to the polarity of the respective operating voltage voltage itself is polarized so that when the foil switch is closed by the foil resistor, the Foil switch and the diode a current can flow, and that the foil series resistance on both foils is a function of the potential difference between the mass of the foil assigned to him and the foil leader's own vest controlled variable Resistance is. which is at least comparable with the vest-type resistor when the potential is equal high resistance who! assumes, in the event of a potential

denheii but in comparison to the western pre-resistance is low resistance.

The diode achieves an electrical decoupling of the foil mass from the device mass. Foil mass and device mass therefore do not completely match in the device according to the invention. Which in the event that one's own vest comes into contact with one's own foil, the foil resistance increases significantly further leads to a strong decoupling of the foil from its operating voltage, the result is the foil in the case of contact with the west no longer low resistance, but only over such high impedances with the Device ground or the operating voltage connected that there is no longer the vest potential in a die Hit display can affect the preventive scope.

A preferred embodiment of the invention, in which the controllability of the foil series resistor in is realized in a particularly simple manner, is characterized in that the Floreitvoricherung from consists of a higher-resistance fixed resistor, which is connected in series with a lower-resistance fixed resistor and a transistor is connected in parallel in such a way that the emitter of the transistor is connected to the isolated line in the foil and the base of the transistor via a resistor and a diode the assigned vest is connected, the polarity of the diode depending on the polarity of the Operating voltage is chosen so that the transistor normally receives the operating voltage across the diode is controlled. With this circuit arrangement, the vest matches the mass of its own foil touches, the emitter and base of the transistor are connected to one another via the vest. The transistor blocks therefore and switches off the lower ohmic fixed resistor lying in series with it, so that as Foil series resistor only the higher-ohm fixed resistor remains in effect.

The invention is explained in more detail below with the aid of an exemplary embodiment shown in the drawing explained; it shows

F i g. 1 is a schematic representation of the hit detector of a foil, specifically in the partial figure a in Normal case, in part b in the event of a hit,

Fig. 2 is a schematic circuit diagram for ease of use Understanding a device according to the invention,

F i g. 3 is a circuit diagram of the device according to the invention.

In FIG. 1 shows schematically the mode of operation of a hit detector 1 as it is attached to the tip of a foil, not shown. The hit prevention device consists of a foil switch S 1, 52 and a plunger 3 which is guided in a detector housing 2 such that it can be moved in the longitudinal direction of the foil. Normally, the plunger 3 protrudes and the foil switch S1, 52 is closed, as the partial figure la shows. In the event of a hit, on the other hand, the plunger 3 is pushed back into the detector housing 2 of the hit detector and the foil switch 51, 52 is opened as a result, as shown in part 1b. Of the two switch contacts, one is permanently electrically connected to the plunger 3 and corresponding to FIG. 2 connected to the respective operating voltage ± 12 V by means of a line 4 insulated in the foil and the connection point PY, PT via a foil series resistor RA or RB. The other sounder contact, on the other hand, is connected to the mass of the foil, which is formed from the blade, bell and handle and indicated in the drawing by the point Pi or P2. The F i g. 2 shows that the operating voltages ± 12 V of both foils are polarized in opposite directions, whereby in FIG the points Pl, P2 or PY and PT are shown. In Fig. 2 the two vests WA, WB are further shown schematically, which are electrically conductive and are each in electrical connection with a hit display device TA, TB.

For each foil, a diode D 1 or D 5 is provided between the foil mass, namely the point P1 or P2, and the device mass, which in turn is polarized according to the polarity of the respective operating voltage ± 12 V. that when the foil switch 51, 52 is closed by the foil resistor RA, RB. the foil switch and the diode a current can flow. The floreti resistor RA, RB is a resistor controllable to higher resistance values on both florets, which is indicated in FIG. 2 by the arrow in the circuit symbol of the resistor. This control towards a higher resistance value takes place when an electrical contact is made between the mass of the foil assigned to the respective foil series resistor and the foil leader's own vest, so if in Fig. one of the connection V indicated by dashed lines comes about. If, for example, the vest WB is touched with the foil switch 52 and the foil switch 52 is opened, the vest WB takes on the left operating voltage of -12 V via the plunger 3 of the foil scarf 52 and the foil resistor RA. If the vest WB is touched with its own foil at the same time, i.e. with one of the points P \ or PY when the foil switch 51 is closed, the resistance value of the foil pre-resistor of the RB, which is greatly increased at this moment, prevents the right operating voltage of -I-12 from having a greater influence V on the potential of the vest WB. At the same time, the diode D 1 is polarized in such a way that it blocks when the potential of the vest Wß via the plunger of the foil switch 52 and the foil series resistor RA becomes negative. By touching the vest WB with its own foil (P1, PY) , the potential of the vest WB in the event of a hit can therefore no longer be recorded in a manner that excludes the hit display.

In detail, FIG. 3 shows an embodiment in which the foil series resistor RA, RB consists of a higher-ohmic fixed resistor R1, R14, to which a series circuit of a lower-ohmic fixed resistor R2, R15 and a transistor Ti, 7 "6 is connected in parallel. This parallel connection takes place in such a way that the emitter of the transistor is connected to the isolated line in the foil, ie the points PY or P2 ', and the base of the transistor is connected to the associated vest WA, WB via a resistor / 4, R 17 and a diode D2, D6 The vest WA or WB is connected to the associated operating voltage ± 12 V via a vest series resistor R 3, R 16, and the polarity of the diode D2, D6 is selected depending on the polarity of the operating voltage so that the transistor Ti, T6 is normally turned on by the operating voltage via the diode D2, D6, which assumes that the transistor Ti is an npn transistor, the transistor Γ6 is a pnp transistor.

Circuits with transistors 72, 73 and 77 correspond to those in FIG. 2 indicated hit display devices TA and TB. The hit signals are picked up at G 1 and G 2, respectively, and are used for hit processing, which is not further described here.

Furthermore, each vest WA, WB is assigned an electronic switch controlled by the vest potentiaL via a resistor R 9 or R 22 , each consisting of transistors 74 and T5 or 78 and 79. This switch keeps the associated foil resistor RA or RB of the opposing foil switch SI, S 2 at its low-resistance value even if the blade of your own foil only touches the opponent's vest. This is done in such a way that the electronic switch 78, 79 or 74, 75 has a polarity opposite to the respective operating voltage via a diode D 4 or D 8 on the base of the transistor 71 or 76 assigned to the foil resistor of the opposing foil Voltage switches.

The functionality of the circuit is described below:

Idle state (Florcttschalter Sl. S 2 closed.

West WA and WB by the respective opposing

Foils not touched)

In the in F i g. 3 on the left half of the circuit, starting from the operating voltage -12 V, the transistor 76 is fully opened via R 16, D6 and R 17, so that the smaller resistor R 15, for example 20 Ω, fully next to the larger resistor R 14, for example 100 Ω, is effective will. The current flowing through the parallel connection of R 14 and R 15 as well as further through the foil switch S 2 and D 5 practically generates the potential of the device ground at point P 2, more precisely a slight negative voltage (about -0.6 V). corresponding to the voltage drop at the diode D 5. The vest WA is at the operating voltage of practically -12 V. The diode D 3 blocks so that no current can flow through R 5. The transistor 72 is therefore completely blocked, and the transistor 73 is correspondingly completely open. This creates practically zero potential at the output of transistor 73, which means that no hit is displayed, since the hit display corresponds to a potential above +5.5 V at output G 1 or G 2.

Furthermore, transistor 74 is blocked via R 9 because of the negative bias voltage. Therefore, 75 is fully turned on so that a negative voltage prevails at its collector. However, DA blocks, so that transistor 71 remains unaffected by this negative voltage

, on which in FIG. 3 on the right half the ratios are corresponding, but there the operating voltages are reversed in sign. Here, too, the transistor 71 is fully turned on, so that a slight positive potential, namely the voltage across D 1, is applied to P1. The vest WB is at a potential of practically +12 V via R 3. The transistor 77 is therefore fully turned on via D 7. so that at the output of 77 there is again practically zero potential, i.e. no hit is displayed, since the hit display at this output also only corresponds to a potential above + 5.5 V. The transistor 78 is blocked via R 22, the transistor 79 thereby fully switched on, so that on Collector of 79 a voltage of almost + 12V is applied, but this is kept away from transistor 76 by the blocking diode D 8, so that it cannot influence transistor 76.

For a better understanding, the transistors that are fully open in the idle state are shown in the drawing indicated by hatching; the other transistors are in the blocking state.

ίο II.

Hit condition (without touching one's own vest with the mass of one's own foil)

Assume a hit on the vest WB .

Then the foil schaller S2 touches the vest VV'ß and is opened in the process. By opening S 2, R 14 is connected to the vest WB via the switch plunger. The point Pl is exposed. The negative operating voltage of -12 V is applied to the vest Wß via the parallel and series connection R 14, R 15, 76 and further via the plunger 3 of S2, since the vest series resistor R 3 is large compared to the through

76 foil series resistor RA is put into the low-ohmic state. The negative voltage on WB blocks Dl via the transistor 77. so entsieht at the output of which R 21 is a positive voltage, so that a hit indication is obtained when this output voltage exceeds + 5.5V.

In the opposite case, when the vest WA is touched by S1 , the positive voltage then appearing on the vest WA opens the transistor 72 via D 3, which in turn blocks the transistor 73, so that a positive potential again at the output of via R 8 73 appears, which leads to a hit display if it is above +5.5 V.

If the vests WA or VVS are touched directly by & w foil switches S 2 or S 1, so that no significant transfer resistance occurs between the respective foil switch and the vest that is touched, transistors 73 and

77 a control voltage of such magnitude. that these transistors block completely and a full voltage of +12 V appears at the respective display outputs G 1, G 2. Has but this resistance, it forms, together with R 5 or R 18 form a voltage divider, so that a lower control voltage across R 6 and R stands for grouting 19 for controlling the transistors 72. 73 and 77 has a finite value, since " with the result that the transistors 73 and 77 do not close completely and thus at the output GI. In each case a lower positive output voltage al + 12V arises, namely the lower the voltage, the greater the contact resistance between S1 and vest WA or S 2 and vest WB is through a suitable choice of the size of R 5 or R 1 in particular, the ratios should be chosen so that the transistors 73 or 77 are not blocked and no hits are displayed if the value of the contact resistance exceeds 400 Ω

The value of the contact resistance between zero and 400 Ω then changes the display voltage at the outputs GI, G 2, with the evaluation following these outputs, never shown in the drawing and not described here circuit is responsible for the output signals according to voltage size and thus according to the size of the respective transition To sort resistance and to classify according to the applicable sports rules. Such increased ex

10

resistance occurs, for example, when not the vest itself, but just a spot in its vicinity on the opponent's body is hit, in which case the conditions on the route between the hit point and the vest den Determine contact resistance.

III.

Hit condition, but the victim touches his own vest with the mass of his foil

One assumes. that the fat switch 52 touches the vest WB and is thereby opened, the state already described under II is established. In addition, however, the point Pl, that of the mass. thus corresponds to the blade, the bell or the knob of the foil with which the vest WB comes into contact. This has the consequence that the emitter and base of the transistor 71 via the vest WB. the diode D 2 and the resistor RA are connected, so that T \ blocks. As a result, R 2 becomes ineffective and the vest WB is connected to the operating voltage + 12 V via the parallel connection of R 1 and R 3 and via a series connection of 52 and R 14. The latter R 15 is in parallel with the transistor 76, with the operating voltage - 12 V applied. (The vest series resistor R 3 is only to be taken into account as a parallel resistance to R 1 if it has a value comparable to R 1, i.e. with the foil series resistor hB in the high-ohmic state.) The result of the hit (connection between; (o 52 and vest WB ) The potential of the vest WB that has become negative shifts to lower values, but remains negative.For example, in a pure hit situation according to the ratios described under II it is -10 V. with simultaneous contact of the vest with the mass of its own foil about -5 to -6 V. In any case, the potential of the vest WB remains negative, despite the contact with its own foil, that the transistor 77 is blocked via D 7 and a positive potential appears at the output G 1 of the transistor in the sense of a hit indicator.

If the situation is the other way around, i.e. 51 hits the vest WA and if the vest WA is touched with its own foil at the same time, i.e. connected to P 2, TS blocks, which has the result that the potential of the vest WA despite the contact with the Your own weapon remains positive as a result of the hit from 51 so that Γ2 switches through and 73 blocks and thus a positive potential appears again at output G 2 in the sense of a hit display.

The functioning of the electronic switches 74, 75 and 78, 79 can be described as follows:

Let us first deal with the case that 52 came into contact with the vest WB and thereby opened it. Regardless of whether the vest WB is now touched with one's own foil (Pl) or not, the victim can touch the vest WA with the blade of his foil. When the vest WA touched by 51 (next to the hit 52 on the vest WB) , R \. 51. Pl, vest WA. /? 16 a voltage divider that changes the bias voltage at 76 via R 17, in the sense of a blocking of 76. By closing Tb only R 14 would be effective, which would simulate a high contact resistance between 52 and vest WB. The consequence of this would be that a signal voltage would arise at output G I which, despite a direct hit on the vest WB, had a value less than + 12 V and would therefore be evaluated as a hit with a high contact resistance. The hit would therefore be classified incorrectly in the downstream signal evaluation. In order to rule out the risk of incorrectly displaying hits, the blocking of 76 must be prevented. The electronic switches T 4. 75 or 78, 79 are used for this purpose. In detail, 76 becomes via D8. /? 2S and -12 V turned on so that R 15 remains effective alongside R 14. This opening is achieved because 79 is blocked, contrary to the idle state, since 78 is opened via R22 due to the negative voltage at Wesie WB . In fact, transistor 76 is only blocked for a very short time and then immediately turned on again via D8. The resulting temporary short voltage change at the output G 1 is not detrimental to the hit evaluation, since this evaluation takes place with greater inertia. The control of 78 is much more sensitive than that of 77. 78 is therefore already fully opened when 77 is by no means fully blocked. The switching through from 76 to 79 is therefore already complete if the potential of the vest WB does not reach its full negative value in the event of a hit because the vest WB has been touched with its own foil (P1). Since 79 is always blocked when the vest WB is hit. the control of 76 takes place in the sense described regardless of whether or not the vest was touched with one's own weapon at the same time as the hit. In the opposite case, namely hit on vest IVA, contact of vest WB with the opponent's blade (P2. P2 '). the circumstances are accordingly. 75 is replaced by D4. R 13 opened so that R \ and R 2 remain fully effective. A further description of this state is superfluous, since it is completely analogous to the circuit state discussed above.

For this purpose 2 sheets of drawings 709 508/11

Claims (4)

Patent claims: 1. Device for electrical indication in fencing, in which a standing and electrically conducting a search results display device in electrical communication vest, which is connected to the operating voltage via a Westenvorwiderstand, and a foil are provided for each of the two opponent and at its tip a hit detector carries, consisting of a foil switch and a plunger that opens the foil switch in the event of a hit , one of the two switch contacts of which is electrically connected to the plunger and, by means of a line insulated in the foil, to the operating voltage via a foil resistor, the other to the switch contact the foil mass formed from blade bell and stapling is connected, wherein the operating voltages of both florets and the corresponding west are oppositely poled, characterized in that for each foil / and the device ground wipe the foil mass (P2 point Pl.) a diode (DX, D5) provided hen, which is in turn polarized in accordance with the polarity of the respective operating voltage so that when the foil clipper (5 1, 52) is closed by the foil resistor (RA. RB), the foil switch (51, 52) and the diode a current can flow, and that the fiorette resistor (RA. RB) on both foils a depending on the potential difference between the mass of the foil assigned to it and one's own vest (WA. WB) is the leader foil controlled variable resistor having a third with your Westenvorwiderstand (R R accepts 16) at least comparable high-resistance value at Poten'ialgleichheit, at Po <but entialverschiedenheit compared to West- R 16) is low. 2. Apparatus according to claim 1, characterized in that the foil series resistor (RA. RB) consists of a higher-resistance fixed resistor (Ri, R 14), which is connected in series with a lower-resistance fixed resistor (R 2. /? 15) and a transistor (71 . 76) is connected in parallel in such a way that the emitter of the transistor is connected to the isolated line in the foil (point PW P2 ') and the base of the transistor (71, 76) via a resistor (R4. RM) and a diode (D2, D6) is connected to the assigned vest (WA, WB) . the polarity of the diode (D 2, D6) being selected as a function of the polarity of the operating voltage so that the transistor (71, 76) is normally turned on by the operating voltage via the diode (D2, D6). 3. Device according to claim 1, characterized in that each vest (WA. WB) is assigned an electronic switch (74, 75 or 78, 79) controlled by the vest potential, which connects the foil resistor (RA. RB) of the opposing foil switch (51 , 52) holds its low resistance even if the blade of one's own foil only touches the opponent's vest. 4. Apparatus according to claims 2 and 3, characterized in that the electronic switch (78, Γ9 or 74, 75) via a diode (D 4. O8) on the basis of the foil resistor (RA. RB) of the opposing foil associated transistor (71 or 76) switches a voltage of opposite polarity to the respective operating voltage.