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Movable handle device of three-arm protractor

A technology of indexer and dial, which is applied in the field of measurement and drawing tools, and can solve the problems of acceleration indicating arm wear and affecting the accuracy of measurement, etc.

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

When surveying and mapping with the existing three-bar indexing instrument, the hand directly operates the finger arm assembly itself, which leads to wear of the acceleration indicator arm and affects the accuracy of the measurement.

Method used

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  • Movable handle device of three-arm protractor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0013] See figure 1 As shown, 1. A movable handle device of a three-bar indexing instrument has a dial 1 and a finger arm assembly 3 connected to the dial 1 through a connecting ring assembly 2, and also has a movable handle assembly 4, and the movable handle assembly The two ends of 4 are movably connected to the finger arm assembly 3 through the first screw 5 and the second screw 6 respectively, located in the axial direction of the finger arm assembly 3, and are provided with a knob assembly that cooperates with the movable handle assembly 4 6. The pinch assembly 6 is fixed on the finger arm assembly 3, and the movable handle assembly 4 has a left movable handle 41 and a right movable handle 42, which are respectively connected to the left finger arm 31 and the right finger arm of the finger arm assembly 3 32, the pitch of the first hole 51 on the left movable handle 41 matched with the first screw 5 is larger than the nut diameter of the first screw 5, and the left movable...

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PUM

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Abstract

The invention discloses a movable handle device of a three-arm protractor. The movable handle device is provided with a dial and an indicator arm assembly connected with the dial through a connecting ring assembly, and is also provided with a movable handle assembly. Two ends of the movable handle assembly are respectively movably connected on the indicator arm assembly respectively through first screws and second screws. A knob assembly which is matched with the movable handle assembly is placed in the axis direction of the indicator arm assembly and is fixed on the indicator arm assembly. The movable handle device is in favor of solving the problems that indicator arms can be polluted and abraded by direct operation of hands, two hole sizes on one movable handle of the movable handle assembly are both larger than nut diameters which are matched with the hole sizes, and thus the movable handle assembly is availed to move in the axis direction of the indicator arm assembly and be better matched with the knob assembly.

Description

technical field [0001] The invention relates to a surveying and drawing tool used at sea, in particular to a movable handle device of a three-bar indexing instrument. 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. When surveying and mapping with the existing three-bar indexing instrument, the hand directly operates the finger arm assembly itself, which leads to wear of the acceleration indicating arm and affects the accuracy of measurement. SUMMARY OF THE INVENTION [0003] The purpose of the present invention is to solve the above existing prob...

Claims

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Application Information

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