SU425230A1 - DRUM SWITCH - Google Patents

Description

one

The invention relates to radio engineering.

Known drum switches consisting of a housing, a base, a drum with contacts, current collection contacts, one end of each of which is rigidly fixed to the base, are characterized by a complex structure and low reliability of operation.

The purpose of the invention is to simplify the design and increase the reliability of the switch.

This is achieved by the fact that the contacts of the drum are arranged in grooves along the drum-forming U-shaped, and interact with the free end of the current-collecting contacts, each of which is made in the form of a C-shaped comb, the protrusions of the links of which are shifted relative to each other.

FIG. 1 shows the scheme of the proposed drum switch; in fig. 2 - current collector contact; pas figs. 3 - contact section and channel sector; in fig. 4 - current collector contact, the teeth of which have a circular cross-section fixed on a flat spring.

The drum switch consists of a housing 1, a base 2 — an electronic circuit board, current-collecting contacts 3, each of which is made in the form of a C-shaped comb, the protrusions of the teeth 4 of which are shifted relative to each other, and one end of the contacts 3 is rigidly fixed on the base 2 The drum 5 with sectors 6 and contacts 7. The latter are arranged in a U-shaped along the drum-forming section and have a concave surface that becomes convex at the points of contact. This ensures that the position of the drum 5 on the desired channel is fixed by

The C-shaped contact end 3. On the side edges of the sectors 6, there are insulating gaps that eliminate the short circuit between the contacts 7 of the neighboring sectors 6. A current-collecting contact 3 can be made

as from the flat spring with the spring wire teeth welded to it, and flat from the sheet spring material.

When switching the drum 5, the free ends of the collector contacts 3 slide along the contacts of the drum from the contact cavity 7 to a convex surface. Tooth comb contacts 3 dav t convex surface

contacts 7, providing at the same time as fixing the drum 5, so n reliable electrical connection. The small difference between pins 3 and 7, due to manufacturing tolerances, is eliminated by shifting the gauges.

teeth 4 combs.

Subject invention

A drum switch consisting of a casing, a base, a drum with contacts, current collector contacts, one end of which each is rigidly fixed on the base, so that HI and so that, in order to simplify the design and increase reliability

switch operation, the drum contacts are located in grooves along the U-shaped drum that form the drum and interact with the free end of the current-collecting contacts, each of which is made in the form of a C-shaped comb, the teeth of which are shifted relative to each other

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