SU66853A1 - Vernier device - Google Patents

Description

In shortwave radio receivers, retarders (verniers) are used for sharp tuning, the existing constructions of which give a slowdown in the order of 1: 25 - 1: 60 MaKCHMiyiM. With greater slowdown, the verniers are cumbersome. In addition, existing mediators are separate devices that require dedicated space behind the front panel especially for them, among other receiver devices.

The proposed vernier device also serves for sharp tuning in short-wave receivers, but it is devoid of the above-mentioned drawbacks of the existing moderators. The device, with well-fitting parts, allows a deceleration from very large to very small. The entire device at the same time is the control knob (normal for the size of the handle); therefore, it is attached to the outside of the front panel, without occupying, always limited, the space inside the receiver. The instrument is made (ALMOST all of forged parts made of steel or plastic parts.

In some of its design features, the proposed vernier device is similarly known to that of the patent literature. For example, vernier devices for radio receivers are known, equipped with coaxially arranged coarse and fine adjustment knobs, the first of which is connected to the axle directly, and the second through friction transmission, as applied in the proposed device. The location of the fine adjustment knob on the side of the coarse tuning is also known.

The essence of this device lies in the special design of the differential connection between the three adjustment knobs, of which two are coaxial and a third is located to the side of them.

FIG. 1 of the drawing, the proposed device is shown in longitudinal section, FIG. 2 is a front view of the device with a partial section; FIG. 3 - option one

of the device nodes circled in dotted lines in FIG. one.

The guide disk 5, with the aid of a fitting 16 fixed to it, washers 3 and nuts 1 and 2 is fixedly mounted on the front side of the panel 4 of the receiver. A roller 10 (axis of adjustment) passes through tongue 16, connected by means of a coupling 17 and tension rings 18 to an axis of the device requiring slow rotation. At the other end of the roller 10, a friction disk J5, freely rotating on the roller, and a handle of direct rotation 8 are put on. In order for the handle 8 not to rotate on the roller 10, the latter has sections (planes) in the place of the landing of the handle; The roller cross section at this location is shown in FIG. 1 hatching. The handle 8 has a hole, the configuration corresponding to the cross section of the roller 10, and is pressed against the disk 15 by a spring washer 9. The disks 5 and 15 are covered by spring holders 6 to 7. Both of them are fastened together by means of three spikes located around the circumference of the drive roller 13 , and equalizing rollers 19, under which heads spring washers are seated 14. Washers 14 press clips 6 and 7 against each other and against friction disks 5 and 15.

The purpose of the spring clips 6 and 7 is double: firstly, they hold the friction discs 15 and 5 and, secondly, they press the drive roller 13 and equalizing rollers to them} 9. The tension of the spring clips is adjusted by the tension bolt 20.

The drive roller 13 has an end with a cutout and sharpening of the sleeve 7, with a handle 11 mounted on it, held by a spring washer 12. The clip 13 may have another design (see FIG. 3), in which the handle // is missing, and its role is performed by the end of the roller, which has a corrugated surface. The washer 12 rests directly in the holder 7 in this case.

The roller 13 is one of the links of the friction transmission and is made stepwise. The part that has a smaller diameter is in friction clutch with the disk 15, and the part that has a slightly larger diameter is in engagement with the guide disk -5.

The vernier device is used as follows.

When rotated by the handle 8, the same rotational speed as the handle 5 rotates to the roller 10. When rotated by the sleeves b and 7, the roller 13, the friction disk 15 and the handle 3 are transferred to the roller 10/0-fold deceleration. By rotating the handle // of the roller 13 onto the roller 10, a 100-fold deceleration is transmitted. At the same time, the driving roller 13 moves along the rim of the friction clutches, or carries them along, or pushes them off at a much slower speed than it moves, and the point on the surface of the large drive roller stage describes the epitrochoid. Thus, being simultaneously a control knob and a vernier, the device has three rotational speeds. At interchangeable moving friction clutch / 5 and driving roller 13, we have any deceleration, which is obtained due to the principle of differentiation of the rotational speeds of the friction with respect to the roller, which is based on the instrument.

Subject invention

A vernier device for radio receivers, equipped with coaxially positioned coarse and fine adjustment knobs associated with the axis of adjustment: the first one directly, and the second through a friction gear, which is characterized by the fact that a stepped friction roller is used to make this gear, which is pivotally mounted inside the hollow adjustment knob on the side of the coarse adjustment knob and with its part having a larger diameter, is frictionally connected with the fixed guide disc, and with the part having a smaller diameter, with a disk sitting on the axis of adjustment and frictionally coupled to a hollow handle so that the friction system forms a differential -w

12

gearing, which makes it possible to slow down even more slowly than with a precise adjustment, to the axis of the adjustment when the handle of the stepped roller is rotated.

FIG. one

FIG 2

nineteen

FIG. 3