CN2170500Y - Protractor with movable ruler - Google Patents

Abstract

The utility model relates to a protractor with a movable ruler, belonging to a plotting tool. The utility model is used for measuring an angle and plotting a figure having an angle, and is characterized in that the protractor is composed of a protractor basal body whose center of a circle is provided with a connecting hole, and a movable straight ruler whose centre shaft and one end are provided with connecting holes, on which angle and length value are engraved. The utility model has the advantages of simple structure, easy fabrication, exact and quick plotting, without influencing by visual angle and radial, high work efficiency, etc.

Description

Protractor with movable ruler

A kind of protractor that drives chi belongs to and draws and measurement apparatus technical field, is mainly used in the figure of drafting band angle and the angle in the measurement pattern.

Commercially available protractor or be graphometer in prior art, semicircular thin plate only, be carved with the center of circle and 0～180 ° of scale on it, use the most experiences of must leaning on range estimation, no matter be the angle of measuring between two lines therefore, its precision of angle of still drawing given angle all is subjected to the influence of visual angle and light, makes the number of degrees of reading or drafting all not accurate enough, and mapping speed is slow, inefficiency.

The purpose of this utility model be to provide a kind of making simple in structure, easy, the mapping rapid, accurate, convenient and practical, cost is low, all can use to senior engineering designer from students in middle and primary schools, the protractor of the drive chi that can increase work efficiency.

Principle of work and request for utilization according to protractor, at the subject matter that exists in the prior art, basic design of the present utility model is: establish a connecting hole in the center of circle of known protractor, the movable ruler that connects as one with the hinged one one end band connecting hole of hyaloplasmic axis in a Dai You Nei Cone hole or an end and above-mentioned axis, this ruler can rotate around axis, thereby realizes purpose of design.

The protractor of described drive chi that is characterised in that of the present utility model is made of the movable ruler that the center of circle has protractor matrix, axis and an end band connecting hole of connecting hole, above-mentioned protractor matrix and movable ruler are overlapping hinged by above-mentioned axis, movable ruler rotates around axis, so that indicate the scale exact position with this ruler during angulation, during the painting folder angle with this ruler painting folder arm of angle line.Whether above-mentioned axis is the hyalomitome articulated axle in Dai You Nei Cone hole, and movable ruler was rotated flexibly, be convenient to observe central point again and overlap fully with the measurement starting point.When above-mentioned movable ruler when also being hyaloplasmic, the hyalomitome axis in above-mentioned Dai You Nei Cone hole can be connected as a single entity with an end of this activity ruler and the connecting hole of this axis and above-mentioned protractor matrix is and is slidingly matched.

The utility model has the advantages that: simple in structure, easy making, no matter take measurement of an angle or the drafting angle, or else be subjected to the influence of visual angle and light, mapping accurately rapidly, thereby can increase work efficiency, easy and simple to handle, applied range, all can use to senior engineering designer from students in middle and primary schools, the producer of original production protractor or ruler needn't increase any equipment and can change the line of production.

Accompanying drawing is one of the utility model most preferred embodiment assembling back one-piece construction schematic top plan view, and 1 center of circle has the protractor matrix of connecting hole among the figure, the hyalomitome axis in 2 Dai You Nei Cone holes, the movable ruler of 3 one end band connecting holes.

Protractor matrix 1 is selected the known graphometer of organic glass matter radius 45mm for use in this embodiment, and the center of circle is opened one The connecting hole of 12mm, axis 2 also are processed into Dai You Nei Cone hole with organic glass

The 9mm right cylinder, movable ruler 3 adopts organic glass, and the ruler length value indicates 0～60mm.

Change as present embodiment:

1, the size of the overall dimensions of protractor matrix 1, ruler 3 and starting material all can suitably change;

2, the connected mode of axis 2 and ruler 3 can change into bonding.

Claims (3)

1, a kind of protractor that drives chi, be made of protractor and moving chi, the movable ruler [3] that the protractor that is characterised in that described drive chi of the present utility model has protractor matrix [1], axis [2] and an end band connecting hole of connecting hole by the center of circle and is carved with angle and length value on it constitutes; Above-mentioned protractor matrix [1] and movable ruler [3], overlapping hinged by above-mentioned axis [2], movable ruler [3] can rotate around axis [2].

2, the protractor of drive chi according to claim 1 is characterized in that above-mentioned axis (2) is the hyaloplasmic articulated axle in Dai You Nei Cone hole.

3, root connects the protractor of claim 1 and 2 described drive chis, it is characterized in that when above-mentioned movable ruler (3) when hyaloplasmic, the hyaloplasmic axis (2) in above-mentioned Dai You Nei Cone hole can be connected as a single entity with an end of this activity ruler (3) and the connecting hole of this axis (2) and above-mentioned protractor matrix (1) is and is slidingly matched.

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