DE142742C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

- JU 142742 CLASS 20 /.

Patented in the German Empire on June 4, 1901.

The contact shoes forming the subject of the invention for partial conductor operation with contact buttons consist of several magnetic ones that slide over the contact buttons isolated, but electrically connected parts. A front, larger part will be like usually magnetized, while a smaller, rearward part is opposite or even is not magnetized. In the former case, opting for railways with greater speed suitable, the magnetic circuit device receives a strong magnetic shock, which quickly opens the electrical contact. In the latter case, opting for orbits with If the speed is moderate, the magnetic influence is interrupted earlier than so far, which gives enough time for the electrical contact to fall off by itself.

In carrying out the invention, care is taken

Also taken into account that the contact shoe can be used in two directions got to. Each contact shoe is thus separated into three parts by means of intermediate storage of small, non-magnetic, but metallic spacers, namely in one middle, larger part and into two smaller parts at each end.

Fig. Ι shows schematically the two contact shoes with their magnetic cores and exciting coils. The pieces a ¹ c ¹ and b ¹ d ^l and a ² c ² and Z> ² d ² are the smaller auxiliary contact shoes at the ends. The power supply for the excitation coils takes place through connections 1 to 6, which are arranged on the shift drum and connected to the points shown identically in FIG. 1 by insulated cables. However, the connecting cables are not shown in the figure. FIG. 2 shows the connection of the battery with the excitation coils of the contact shoes when driving from left to right and FIG. 3 shows the same when driving from right to left.

The circuit diagrams of Figures 4 through 7 illustrate the purpose of the invention. In 4 and 5 it is assumed that the contact shoe is his in the usual manner is magnetized evenly along its entire length, while in Fig. 6 and 7 the contact shoe has the type selected according to the present invention.

In Fig. 4 and 6, the contact shoe is above contacts 1 and 2, while it has just left contact 1 in FIGS. 5 and 7 and has not yet reached contact 3 has so that it is only in contact with contact 2.

In order to follow the course of the current, it must be taken into account that the current, from starting from the generator 4 of the power plant, its way via line 5 to cable 6 takes and from there branches off to contacts 1, 2 and 3. Is the contact shoe old construction above contacts 1 and 2 (Fig. 4), then both contact 1 and contact 2 is closed and the current can be fed to the via both contacts

Contact shoe and from here to the motor 7 of the car and then back via rail 8 get to generator 4.

If the contact shoe has now left contact 1, so that the iron plate i ^{a became} magnetic, then the angle lever 1 *, since it is then no longer under the action of the previously magnetized plate i ^a , should fall down by its own weight and thereby the interruption the current circuit device ι cause. This current interruption also takes place properly if no earth fault has been created between the rail and the contact i ^a due to moisture, dirt or other circumstances. Since such a ground fault associated with current losses is inevitable and often occurs, the consequence is that the current with reference to FIG. takes to the rail 8 to return to the power source 4, and also a part of the current will flow via contact 1, plate i ^a and from here via the earth fault 9 to the rail 8. In this case, however, shortly after the contact shoe has left the plate i ^a (FIG. 5), the current will flow to the rail for a moment only via contact 1, earth fault 9, and it will be between the movable and the fixed current connection piece form an arc, which often persisted even after the movable current connection piece had dropped, and then completely destroyed the entire current connection device. ^{Since the current flowed continuously over the plate i a} before the circuit-breaker was completely destroyed, there was also a great danger for people and animals who touched the plate.

In order to remedy these inconveniences, the procedure according to the invention is such that the rear part of the contact shoe is only electrically connected to the front, larger part, but not magnetically. Now, the rear, a short part of the contact shoe is located, as shown in Fig. 6 can be seen, on the contact plate i ^a, then the same is already non-magnetic and allows the moveable current circuit part fall i ^b. The earth fault, which connects the rail with the contact plate i ^a , can now no longer form an arc between the movable current connection part \ ^b and the fixed current connection part of contact a , because the current finds its way through the contact shoe, which has no electrical interruption to the Contact 2, which is connected to the power source 4 by lines 6 and 5. If the contact shoe has left the plate i ^{a completely} , as can be seen from FIG. 8, then, since the current between the movable current connection part i * and the fixed current connection part of the current connection device 1 has long been interrupted, only a spark formation between the plate i ^a and the rear part of the contact shoe, but this is irrelevant and does not give rise to any malfunctions.

The current flow through the contact shoes themselves can be seen in FIGS. 3 and 4.

In the direction of travel from left to right (Fig. 2), the current flows as follows: From the positive pole of the battery through switch contacts 6, 4 and i, then through all coils in parallel to switch contacts 2, 3 and 5 and from there to the negative pole of the battery. The part of the contact shoe at the top in the drawing is magnetized in the direction of travel between points a ¹ and d ^{1 in the} direction indicated by the arrow, so that it shows north polarity, while the rear part ^ ¹ C ^{1 has} south polarity. In the same way, in the contact shoe located at the bottom of the drawing, the piece a ² (P is magnetized in such a way that it has south polarity and the short, rear end a ² c ^{2 has} north polarity.

When driving from right to left (Fig. 3), the current flow is as follows: From the positive pole of the battery through roller contacts 2, 4 and 5, from there through all coils in parallel to roller contacts 1, 3 and 6 and from there to the negative pole of the battery. The magnetization of the contact shoes is now such that piece c ^l b ^{l has} north polarity and piece b ¹ d ^{1 has} south polarity, while piece c ² b ^{2 has} south polarity and piece i> ² d ^{2 has} north polarity. If the connection lines of the outermost coils are interrupted, the current does not flow through them at all and the outer pieces of the contact shoes remain non-magnetic. The best way to break the switch roller contacts is to remove the cables.

Claims (2)

Patent Claims: i. A contact shoe designed as an electromagnet for partial conductor operation with contact buttons, characterized in that it either not magnetizes at all or vice versa on its smaller, rear part than on its larger, front part, which is magnetically isolated from the former, but with the same in electrically conductive connection. 2. An embodiment of the contact shoe protected by claim ι, characterized in that the contact shoe consists of three magnetically isolated, but consists of electrically connected parts, of which, depending on the direction of travel, the rear part either not magnetized at all or the other way around than the two front parts, the excitation of the coils causing the magnetization from the driver's position takes place automatically in accordance with the direction of travel with the assistance of the travel switch. For this purpose ι sheet of drawings.