SU1237910A1 - Magnetic compass - Google Patents

Description

one

The invention relates to devices for determining the direction of a magnetic meridian, in particular magnetic compasses.

The aim of the invention is to improve the accuracy of indications by reducing the influence of magnetomechanical and rotational deviation.

The drawing shows a magnetic compass, a section along the vertical axis.

The magnetic compass contains a pot filled with liquid 1, which with axis 2 is placed in lagers 3 gimbal rings. In pot 1, a sensitive element A is placed {made in the form of a float 5, at the bottom of which a system of compass arrows 6 is fixed. In the center of the float 5, combined with the center of gravity of the sensitive element 4, a firebox 7 is installed at the top of the cone. 5, a card 8. is fixed. A float 5 with the lower concave surface of the furnace 7 rests on the tip of a pin 9, which is attached to the bottom of the pot 1.

In the middle part of the float 5, a cavity 10 is filled with a liquid, and in its upper part, on the vertical axis of the float 5, a positive buoyancy body 11 is rigidly fixed.

In order to balance the sensing element 4 relative to the pivot point (on the stud 9), an adjusting weight 12 is fixed on the float 5, installed in the upper part and ensuring the possibility of aligning the center of gravity of the sensing element 4 to align it with the pivot point.

The magnetic compass works as follows.

Editor N. Shvydka Order 3277/41

Compiled by V. Sarakhanov

Tehred L.Oleynik Proofreader O. Lugova

Circulation 670. Subscription VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

102

The float 5 serves to reduce friction between the furnace 7 and the pin 9. The body of positive buoyancy 11 ensures the stabilization of the sensing element 4 so that the system of magnetic arrows 6 and the card 8 are constantly in the horizontal plane regardless of the conditions of movement of the object on which the compass is mounted .

This is explained as follows. In the sensitive element 4 relative to the point of support on the pin 9, the system of magnetic arrows 6, float 5, card 8, cavity 10 with liquid, positive buoyancy body 11 and weight 12 are balanced so that the center of gravity of the sensing element 4 is at the point of support of the furnace 7 on the stud 9.

Since the center of gravity of the sensing element 4 is aligned with the support point eg, the resulting acceleration of the support point; in case of an uneven movement of the object, they do not cause oscillations or tilt of the sensitive element 4, i.e. The device is largely free from the influence of magnetomechanical and pivotal deviations.

 To ensure a stable equilibrium position of the sensing element. 4 additional positive buoyancy body 11 is introduced into the device. The latter, being in the fluid filling the cavity 10, under the action of the buoyancy force holds the sensitive element 4 relative to the support point in a position at which the restoring moment is zero, i.e. in such a position of the sensing element 4, in which the system of magnetic arrows 6 and the card 8 are located in a horizontal plane.

Claims (1)

A MAGNETIC COMPASS, containing a kettle mounted in a gimbal and filled with liquid, with a pin rigidly fixed to the bottom, on the tip of which a balanced sensing element is installed, made in the form of a float with compass arrows and a card mounted on it, characterized in that, in order to increase accuracy indications in conditions of uneven movement by reducing the influence of magnetomechanical and rotational deviation, the float has an additional closed cavity made in its body and filled liquid, and in the upper part of the cavity, an additionally introduced body of positive buoyancy is rigidly fixed, the center of the volume of which is located on the vertical axis of rotation of the sensing element. 1 I