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Three-arm protractor case

An instrument box and indexing technology, applied in the field of measurement and drawing tools, can solve the problems of instrument wear and screw loss

Inactive Publication Date: 2014-01-01
CHANGZHOU HAOMAI MARINE EQUIP TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This not only causes the screws to be lost, but also causes the unfixed screws to roll back and forth in the case during the carrying of the case, causing wear and tear on other instruments in the case.

Method used

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  • Three-arm protractor case

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Embodiment Construction

[0011] See figure 1 As shown, a three-bar indexing instrument box has a bottomless rectangular box-shaped box cover 1 and a coverless rectangular box-shaped box body 2, and the box cover 1 is hinged to the box body 2 through a hinge 3, One side in the box body 2 has a rectangular step surface 4, the center position of the step surface is provided with a semicircular groove 5 that is engaged with the central bearing of the indexer, and the surface of the step surface 4 is provided with There are three threaded holes 6 matched with the screws.

[0012] The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present i...

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Abstract

The invention discloses a three-arm protractor case provided with a bottomless rectangular box shaped case cover and a coverless rectangular box shaped case body. The case cover is hinged with the case body by a hinge, one side of the interior of the case body is provided with a rectangular step surface, and a semicircular groove which is in clamped connection with a central bearing of the protractor is arranged at the central position of the step surface, the surface of the step surface is provided with threaded holes matched with screws. Because the step surface is provided with the hidden threaded holes, the fastening screws can be favorably stored in the three-arm protractor case and the phenomenon that the fastening screws collide with other instruments in the box cannot be caused.

Description

technical field [0001] The invention relates to a surveying and drawing tool used at sea, in particular to a three-bar indexing instrument case. Background technique [0002] In the field of navigation, a sextant is an optical instrument commonly used to measure the angle between two distant targets. However, in practical applications, the sextant will produce deviations due to various reasons in measuring the latitude and longitude of the sea-going ship or aircraft, which will affect the accuracy of the measurement. Therefore, it is often necessary to use a three-bar indexer for further measurements to reduce errors. [0003] The instrument case of the prior art, especially the toolbox for placing the three-bar indexer, due to poor sealing effect or no sealing function at all, causes the three-bar indexer to be corroded and damaged during storage, transportation and carrying out. The production cost itself is relatively high, and the connection is not firm, causing unnece...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C1/00A45C11/36
CPCG01C1/00A45C11/36
Inventor 狄丹岩朱亮
Owner CHANGZHOU HAOMAI MARINE EQUIP TECH