Protection cover for sextant center shaft

A central shaft and protective cover technology, which is applied in the field of sextant central bearing devices, can solve the problems of increasing maintenance costs, loose nuts, and affecting measurement accuracy, so as to reduce maintenance costs, prevent accidental loosening, and prolong service life Effect
CN103487019AInactive Publication Date: 2014-01-01CHANGZHOU HAOMAI MARINE EQUIP TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CHANGZHOU HAOMAI MARINE EQUIP TECH
Publication Date
2014-01-01
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention discloses navigation mapper equipment, and more particularly relates to a sextant center bearing device. According to a protection cover for a sextant center shaft, a cover body is fixed on a center shaft provided with a screw cap and is provided for protecting the screw cap on the center shaft, and a groove with a size matched with the screw cap is arranged inside the cover body. According to the present invention, the protection cover for protecting the screw cap on the center shaft is added so as to effectively prevent accidental loosening of the screw cap, reduce maintenance cost and prolong a service life of the sextant.
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Description

technical field

[0001] The invention relates to a nautical surveying and mapping instrument device, in particular to a sextant center bearing device. Background technique

[0002] A sextant is an optical instrument used to measure the angle between two distant targets. It is usually used to measure the angle between the sun or other celestial bodies and the sea level or horizon at a certain moment, so as to quickly know the latitude and longitude of the position of the ship or aircraft. Played a major role in navigation. In the past, the central axis of the sextant was fixed on the central shaft sleeve by a nut. Long-term use caused the nut to loosen, or even fall off and be lost. The parts of the sextant also became loose, which affected the measurement accuracy. As a result, maintenance is inconvenient, maintenance costs are increased, and the service life of the sextant is shortened. Contents of the invention

[0003] The purpose of the present invention is to solve ...

Claims

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