SU48675A1 - Electric switch - Google Patents

Description

In some cases, it is necessary to use contact mechanisms that close one or another of a number of electrical circuits when the direction of movement of the moving part of the measuring device is changed.

For example, when working with track meters on railways, electrical devices can be used that mark path defects (for example, drawdowns) on paper tape, etc., excited by current pulses obtained using the specified contact mechanisms driven by track meters.

Such contact mechanisms should be reliable, their contact parts should work as far as possible without friction, wear out weakly, the contacts should carry out a reliable short circuit with the very short contact time of the contacts, etc.

The design of the proposed switch aims to achieve these requirements. The proposed switch is designed so that it closes one or another of the electrical circuits it serves when it changes direction of movement of the movable part; contacts in it can be made fairly reliable, and the execution of the main (moving) contact in the form of a freely rolling cylinder reduces friction and contact wear to a negligible amount.

In FIG. 1 shows a longitudinal section of the main part of the proposed switch; FIG. 2 - top view; FIG. 3-circuit wiring circuit controlled by a switch; in fig. 2 shows the closure of one of these circuits.

On the plate I, made of an electrically insulating material, there are two rows of plate contacts 2, which form inclined planes for the moving contact on the outside. The contact planes 2 of one row are tilted in one direction (one way of moving the moving contact part), and the plane of contacts of the other row is the other way.

The gap between these two rows of contacts is the initial position for the moving contact of the part. The movable contact part consists of an insulating box-shaped carriage 5, which is able to move along the contacts 2 along the ruler 4 and provided with a contact 7 in the middle part, from which the flexible wire 6 comes out.

The carriage 5 accommodates a cylindrical contact 8 that can roll from one end of the carriage to the other. In the end positions, contact 8 is not in contact with contact 7; electric

the connection of contacts 7 and 5 is formed only at the moment of rolling the contact

8in the carriage 5 from the front wall to the back or vice versa. Springs are inserted between ruler 4 and carriage 5

9dl squeeze the carriage in the direction of the plate /, i.e. to the contacts.

Between the contacts 2 and the wire 6 connected to the contact 7 of the carriage, a series of electromagnets 10 are used to produce marks on the tape.

If the work with the track meter is performed, then at a large subsidence of the path or at all transfer the carriage 5, connected with the movable part of the measuring device or device, will move to one side or the other from the initial middle position and contact 8 will fall on the contacts 2 and move along them until the path defect reaches its maximum value, after which the carriage 5 will go backwards.

When the carriage 5 moves from the initial middle position to the right or left, the contact 7 rolls through the cylindrical contact 8 and the circuit does not close at this moment (FIG. 1), since at this time the contact 8 only pushes against one of the extreme walls of the carriage, being carried away but as soon as the carriage 5 goes back (what happens at the maximum

the value of the fit or skew), then there will be a closure of the electrical circuit connected to the contact 2 nearest at this moment (Fig. 3).

In this case, the corresponding device 10 will act and mark the maximum defect size.

Thus, the circuit of the electric circuit occurs in the proposed switch only when the direction of movement of the carriage 5 is changed.

The length of the contacts 2, 7 and is determined by the required size of the contact surface.

The subject matter of the invention.

An electrical switch, in which the contact closure takes place when the direction of movement of the movable part changes, characterized in that the movable contact part is made in the form of a box-shaped carriage 5 with a contact 7 in the middle part and a cylindrical contact 8 located in the carriage 5, when the carriage that rolls across a series of fixed contacts 2 in order to change the direction of movement of the carriage 5, contact 8, moving inside it, to close the circuit of the nearest fixed contact 2 at the moment of crossing tyvani contact 8 by contact 7.

Fig1.

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