Convex angle protractor
A protractor and convex angle technology, applied in the field of protractors, can solve problems such as inability to measure dihedral angles
Inactive Publication Date: 2013-09-25
林辉玉
View PDF0 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0002] The protractor in the prior art cannot measure dihedral angles in daily life and engineering technology, such as angles of wall angles, due to design reasons
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0010] In the figure, the protractor body (1) has angle engraved lines on it, and a fixed-angle pointer (2) is rotatable through a pivot pin (3) at the center of the protractor body.
[0011] When measuring a convex angle, insert the angle pointer into the convex angle (such as a protruding wall corner). When inserting, ensure that the plane where the protractor body is located is perpendicular to the intersection of the two half-planes that make up the convex angle, and the angle measuring end of the angle pointer and the protractor The 180-degree side of the body should closely fit the two half-planes that form the convex corner. According to mathematical knowledge, it can be seen that the measured salient angle at this time is indicated on the protractor through the pointer.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a convex angle protractor which mainly solves the problem that a conventional protractor cannot measure a convex angle in a plane angle of a dihedral angle. The convex angle protractor comprises a protractor body, an angle pointer and a shaft pin. During measurement, the size of the convex angle can be reflected on the angle pointer, and the angle value is read through an angle scale of the protractor body. The protractor provided by the invention is reasonable in structure, easy to use, convenient and practical.
Description
technical field [0001] The invention relates to a measuring device, in particular to a protractor. Background technique [0002] The protractor in the prior art cannot measure dihedral angles in daily life and engineering technology, such as angles of wall corners, due to design reasons. Contents of the invention [0003] In order to overcome the above-mentioned shortcomings in the prior art, the object of the present invention is to provide a tool for measuring dihedral angles when they are salient angles. [0004] The technical solution of the present invention is: the protractor includes a protractor body, an angle pointer, and a shaft pin. The feature is that the angle pointer is installed on the center of the protractor body through a pivot pin, and the angle pointer (2) can rotate around the pivot pin. The angle pointer is divided into two parts, the end pointing to the protractor body with the angle mark is the indicating end, and the other end is the measuring en...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): G01C1/00
Inventor 林立天林辉玉
Owner 林辉玉