DE144963C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

The invention relates to a pole changer or changeover switch in electrical train lighting systems , in which the power generator from the car axis and accordingly in alternating directions and with alternating Speed is driven. In such cases the electrical connections of the power generator such. B. the connections between the armature winding and the useful circuit respectively the accumulator battery can be switched when the direction of rotation of the generator is changed.

For this purpose one usually arranges a gear lever that controls its movement receives a rotating part of the assembly, and that when it is after the one Direction is turned once, remains in this position until a change in the direction of rotation it is turned over again and then transferred to the opposite position.

The switch is thus in connection with

a rotating structural part that has a retractable cam or tooth owns. This moves the switch and is pulled back by the centrifugal force so far that that it disengages from the switch as the speed of rotation increases. When the rotating structural part comes to a standstill and its direction of rotation changes, the driver or the tooth is brought back into engagement - through Heavy or spring force - and now throws the switch in the opposite direction. As soon as the speed increases again, the driver is also withdrawn.

So far, this arrangement has now been carried out in such a way that on the sliding Ring of a centrifugal force regulator seated on the shaft, a drive pin was provided, which protrudes when the shaft is at a standstill, i.e. when the flyweights are applied and at the beginning of the rotation hits the gearshift lever, one by one or the other Reversing direction.

This arrangement requires a complete inertia regulator with springs, joints, etc., becomes expensive and requires quite significant swing weights or strong auxiliary springs, because there is a lot of friction to overcome. In addition, however, there arises the strong evil that when the shaft is moving slowly, for example shortly before the end of the rotation or immediately after starting, the driver at hits the switch every turn. But this makes the contacts permanent worried or relaxed.

The subject of the invention now forms an arrangement of this type in which this Difficulties are avoided in that, on the one hand, the driver is attached directly to the flywheel is attached, so all springs, joints, etc. are omitted, on the other hand, the driver not on the gear lever itself, but on

Claims (2)

an intermediate element acts, which absorbs vibrations caused by the driver hitting, but does not transmit them to the switch. In the drawings, FIG. 1 is a plan view of the rotating inertia regulator and the changeover switch which is moved through the intermediary of the slide rails. The electrical connections are shown schematically ίο. Fig. 2 is a side view of some of the parts viewed from above in the direction of arrow 22. Fig. 3 is a side view of the carriage guide which is used to move the switch. As an example for the illustration, a switch is chosen that switches the connections between the armature winding and the external circuit of a power generator. K is the armature of the generator, K1 the field winding, J is a battery charged by the generator, J1 a switch that closes the circuit as soon as the speed and voltage of the generator are sufficient to charge the battery. N and O are the movable sounder contacts that swing around axis R. Both are used in isolation. The brushes and pole terminals of the power generator may be connected to fixed double contacts L and M. Movement of the switch about the axis R in any direction brings the respective movable contacts into connection with the mating fixed contacts, while the opposite movement of the switch changes these connections. The switch has a forked or slotted arm R 'by which it is rotated. A slider G moves in suitable slide guides 5 and carries a pin I which engages in the forked arm H. The slide carriage is shown in its extreme left position and its movement, as well as in the opposite position, is limited by a pin S1 4-5. When the slider is moved into its right end position, it also turns the arm H to the right and thus changes the contacts (see the dotted illustration). The slider G has a cutout into which the driver E engages in order to move it in one direction or the other. On the rotating part B, a flyweight is arranged, which pulls the driver E back. This swing weight in its simplest form is a slider E1, which z. B. is guided through a pin and slot at one end and a guide sleeve D at the other end; it has a central opening which offers enough space for the nut at the end of the shaft A. The rotating part B is arranged so that the driver E can be advanced into a position in which it comes into engagement with the slide G and can move it in any direction. The swing weight intended to retract the driver is dimensioned so that as soon as the speed of rotation exceeds a certain limit, it is thrown outwards by the inertia force and pulls the driver E back. The mode of operation of the arrangement is as follows: Assume that the rotating disk B has just begun its movement to the right, as shown in FIG the weight of the slide or swing weight E1. If the disk B continues to rotate, the driver leaves the cutout in the slider G. After completing one rotation, it again comes into contact with the slide, but since the driver can be moved freely and the movement is still slow, it will at When it hits the smooth, upper surface of the sliding carriage G, it is shifted upwards and, as long as the movement is slow, it will not cause any inconvenience. If, on the other hand, the rotational speed increases, the inertia force acts on the slider, holding the driver E in its retracted position and preventing it from coming into contact with the slider until the rotation almost stops again. If the direction of rotation is changed, it is z. B. directed to the right, the driver will re-engage and move the slide to its right position, just as it was the case before. Patent A ν claims: 1. Device for automatic switching of an electrical switch at Changing the direction of rotation of a shaft with the help of the inertia, which occurs when a certain rotational speed is reached pulls back the switch arm of the switch, characterized in that the flywheel is designed as a slider is what under weight respectively. Inertia in corresponding guides on one with the shaft rotating disk moves in one direction or the other and thereby the Umstellarm directly attached to it in BEZW. out of engagement with the gear lever. 2. Embodiment of the device according to claim 1, characterized in that the middle attached to the swing weight participant to avoid disturbing influences on the electrical contact very low speed of the shaft not directly on the shift lever, but rather acts on a slide rail connected in turn to the shift lever, through which appropriately designed back of the driver and the swing weight pushed back without any disturbance of the contact If the shaft rotates too slowly, the centrifugal force becomes sufficiently effective to be let. For this purpose ι sheet of drawings.