CN202710041U - Sextant dial - Google Patents

Abstract

The utility model discloses a voyage plotter device, and particularly relates to a sextant dial which comprises a dial body. A strip-type sliding groove is arranged on a position where the outer edge of the dial body and a micro motion disc are matched. The sextant dial is provided with the sliding groove which is matched with the micro motion disc so that the micro motion disc can slide back and forth in the sliding groove and numerical scale on the dial cannot be abraded, and accordingly error is avoided. Meanwhile, an arranged guide rail groove can be matched with a worm wheel of the micro motion disc well so that friction is reduced, measuring accuracy is improved, and service life of the sextant dial is prolonged.

Description

The sextant scale

Technical field

The utility model relates to a kind of navigation surveying instrument device, particularly a kind of sextant scale.

Background technology

In navigational field, sextant is commonly used to measure the optical instrument of angle between two targets in a distant place.Usually measure a certain moment sun or other celestial bodies and sea horizon or horizontal angle with it, in order to learn rapidly the longitude and latitude of seagoing vessel or aircraft location.Measuring and need to further measure on scale by the fine motion dish at existing sextant, because fine motion dish and scale need long-term break-in, causing the scale wearing and tearing comparatively serious, the precision measure deviation is larger, has affected the effect of measuring.

The utility model content

The purpose of this utility model is the problem that solves above-mentioned existence, and a kind of sextant scale that reduces to rub, improve measuring accuracy is provided.

The purpose of this utility model realizes as follows: a kind of sextant scale, have disk body, and the described disk body outer rim position of matching with the fine motion dish is provided with the bar shaped sliding tray.

Further, be positioned at described disk body outer rim and sliding tray adjacent regions distribution guide-track groove.

Advantage of the present utility model: design proposal of the present utility model has the sliding tray that matches with the fine motion dish, and the fine motion dish that can make slidably reciprocates in sliding tray, and the scale numerical value on the scale that can not wear and tear causes error.The guide-track groove that is provided with simultaneously can better cooperate with the worm gear of fine motion dish, reduces friction, and improves measuring accuracy, has prolonged the serviceable life of sextant.

Description of drawings

Content of the present utility model is easier to be expressly understood in order to make, and the below is described in further detail the utility model, wherein according to specific embodiment also by reference to the accompanying drawings

Fig. 1 is structural representation of the present utility model;

Fig. 2 is the side view of Fig. 1;

Fig. 3 is the partial schematic diagram of described guide-track groove;

Reference numeral: 1, disk body, 2, sliding tray, 3, guide-track groove.

Embodiment:

See Fig. 1, Fig. 2 and shown in Figure 3, a kind of sextant scale has disk body 1, and the described disk body 1 outer rim position of matching with the fine motion dish is provided with bar shaped sliding tray 2; Be positioned at described disk body 1 outer rim and sliding tray 2 adjacent regions distribution guide-track grooves 3.Its principle of work is: by sliding tray 2 the fine motion dish is slided easily at scale, and the guide-track groove 3 of the worm gear on design and the fine motion dish, better protected the sextant scale.

Above-described specific embodiment; the purpose of this utility model, technical scheme and beneficial effect are further described; institute is understood that; the above only is specific embodiment of the utility model; be not limited to the utility model; all within spirit of the present utility model and principle, any modification of making, be equal to replacement, improvement etc., all should be included within the protection domain of the present utility model.

Claims (2)

1. a sextant scale has disk body (1); It is characterized in that: described disk body (1) the outer rim position of matching with the fine motion dish is provided with bar shaped sliding tray (2).

2. sextant scale according to claim 1 is characterized in that: be positioned at described disk body (1) outer rim and sliding tray (2) adjacent regions distribution guide-track groove (3).

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