Compass device with inner disc capable of stably rotating in outer disc

Abstract

The invention discloses a compass device with an inner disc capable of stably rotating in an outer disc, and relates to the field of compass devices. The problem that relative rotation of an inner disc and an outer disc of an existing compass is unstable is solved. An upper rolling ball and a lower rolling ball are respectively arranged on the upper end surface and the lower end surface of a rotating ring of the compass device of which the inner disc stably rotates in the outer disc; and a seabed line of the heaven pool is engraved and aligned by a carving machine according to the direction of 0-180 degrees of the dial. The device is simple in structure, convenient to install, stable in rotation and accurate in measurement.

Description

technical field [0001] The invention relates to a compass device, in particular to a compass device in which an inner disc rotates stably in an outer disc. Background technique [0002] The compass used by people consists of three parts: the Tianchi, the inner disk and the outer disk. The Tianchi is composed of a thimble, a magnetic needle, a submarine line, a cylindrical outer box, and a glass cover; the dial on the inner disk is fixed to the upper end of the cylindrical outer box on the Tianchi; It is square, and the crystal lines passing through the center hole outside the four sides of the outer plate form the ten-way of Tianxin, that is, the positioning line. When using a compass to measure a target, it is usually necessary to align the magnetic needle with the bottom line and then align the target with the positioning line to read the mark on the corresponding dial below the positioning line. [0003] However, the compass used by people usually has the inner disk dire...

AI Technical Summary

Problems solved by technology

[0003] However, the compass used by people usually has the inner disk directly embedded in the outer disk. When the inner disk rotates relative to the outer disk, it is difficult to keep the inner disk in a horizontal state during the rotation process. Because the Tianchi is located in the inner disk, the magnetic needle of the Tianchi will follow the inner disk. Rotating and shaking, so that there will be a certain error in the measurement of the target; if the inner disc is embedded in the outer disc through the bearing, since the bearing includes the inner ring and the outer ring, using the bearing to assist the relative rotation of the inner disc and the outer disc will not only increase the manufacturing cost and increase the weight of the compass, Moreover, it is not convenient for the disassembly of the inner disc and the outer disc of the compass; if the inner disc is embedded in the outer disc through a thrust ball bearing, since a plurality of rolling balls in the middle of the thrust ball bearing are distributed in each ball hole of the support body, the bearing used as a compass usually needs It is made of alloy, so the ball hole of the supporting body located in the middle of the thrust ball bearing can only be straight cylindrical, that is, the rolling ball can go in and out up and down in the straight cylindrical ball hole, so the compass is fixed on the supporting body when it is in use. The inner disk may be directly pressed on The outer disk or the outer disk directly presses the inner disk, thus losing the rotation effect of the thrust ball bearing in the compass

Images