CN2487563Y - Protractor with auxiliary ruler - Google Patents

Abstract

The utility model relates to a measuring apparatus, in particular to a protractor with auxiliary ruler, which comprises a protractor and an auxiliary ruler, wherein a perforation is positioned at the circle center of the semi-circular plate protractor; the auxiliary ruler is a transparent strip piece with a length less than or equal to the diameter of the protractor, a convex cylinder is positioned at the bottom surface of the ruler center, a reticule is scored at the longitudinal central axis of the ruler; the auxiliary ruler and the protractor which are fastened with each other are capable of rotating freely with the hole as the circle center. The reticule of the auxiliary ruler is mutually corresponding to the angle reticule of the protractor, so the users can measure angles easily and intuitively, and the school children can judge or draw the angle quickly, which contributes to enlightening the definition and understanding of 'angle'.

Description

Protractor with auxiliary scale

Technical field

The utility model relates to measuring appliance, more particularly, relate to a kind of use convenient, have a protractor of auxiliary scale intuitively.

Background technology

As shown in Figures 1 and 2, general common protractor 10, mainly be 180 ° degree measure stroke line 101 to be arranged being on the transparent plate body of semicircle shape delineation, the user can paste described protractor 10 and be put in the surface that institute's desire measures thing, the plate body of transit dose hornwork 10 and make delineation line 101 aim at the sideline that institutes' desires measure thing, thus record the angle at described angle.And common protractor 10 is inapplicable for the less measurement figure of area, because of delineation line 101 is the rim portions that scribe in protractor 10, when equivalent is surveyed area of graph less than the covering scope of delineation line 101, only can according to delineation line 101 to measuring extension line that initial point extended its angle of rough interpretation, can not measure to entirely accurate the right value of angle.

In addition, above-mentioned conventional amounts hornwork 10 only is fit to for the angle (as shown in Figure 2) that measures on planar graph or the article plane, and its surperficial angle for stereo article can't measure, as article such as corner post, pyramids; And when utilizing described traditional protractor 10 to map in the plane, need on the drawing that will draw degree measure stroke line 101 rim places, to portray in advance and remember, to do the note place again and measure the initial point line of doing aligned with each other, the side must draw out angle graphics, is not convenience so in the use.

Summary of the invention

The technical problems to be solved in the utility model is, above-mentioned deficiency at the standing crop hornwork, provide one use convenient, have a protractor of auxiliary scale intuitively, also can make the school age child can be fast and easily declare and survey or draw angle, help to inspire its definition and understanding " angle ".

The technical solution of the utility model is, designs a kind of protractor with auxiliary scale, comprises a protractor and an auxiliary scale, offers a perforation at the circle centre position of the semicircle plate body of described protractor; Described auxiliary scale is transparent rectangular sheet, and its length is not more than the diameter of described protractor, is provided with a projection that holds that is hollow form at the centre bottom face of described auxiliary scale, and delineation has one to indicate line on vertical central axial line of described auxiliary scale; Described auxiliary scale holds by it that projection embeds in the perforation of described protractor and button knot location mutually with it, and making described auxiliary scale can described perforation be the free turn in the center of circle.The mutual mapping of degree measure stroke line of the sign line of described auxiliary scale and protractor, allow the user can convenient, intuitively carry out angular surveying, also can make the school age child can be fast and easily declare and survey or draw angle, help to inspire its definition and understanding " angle ".

To be designed to demountable structure between described auxiliary scale and the described protractor, described auxiliary scale can be on protractor removal and independent the use, utilize to dash on the blade and establish some through holes that are suitable spacing, just can draw out circle or arc with two tools collocation operation, make the school age child can see through the activity of making and more understand the connotation of the center of circle, radius, diameter, circumference etc.

Description of drawings

Fig. 1 is the stereoscopic figure of usual amounts hornwork;

Fig. 2 is the user mode schematic diagram of usual amounts hornwork;

Fig. 3 is a combination schematic perspective view of the present utility model;

Fig. 4 is an exploded perspective view of the present utility model;

Fig. 5 is a local compound section schematic diagram of the present utility model;

Fig. 6 is the view that the utility model is used to measure three-dimensional triangle body;

The 7th figure is the view that the utility model is used to measure multiaspect column body;

Fig. 8 is the view that the utility model is used to measure the three-dimensional pyramid of multiaspect;

Fig. 9 is the view that the utility model is used to measure cone;

Figure 10 is the schematic diagram of user mode alone of auxiliary scale in the utility model.

Each figure number is simply described as follows in the accompanying drawing: the 10th, and protractor; The 101st, the delineation line; The 1st, protractor; The 11st, the delineation line; The 111st, the benchmark bottom line; The 12nd, perforation; The 2nd, auxiliary scale; The 21st, hold projection; The 211st, wealthy rank portion; The 22nd, indicate line; The 23rd, through hole; The 3rd, a tool.

The specific embodiment

As shown in Figure 3, a kind of protractor with auxiliary scale mainly is made up of a protractor 1 collocation one auxiliary scale 2, and wherein, described protractor 1 is one to be the plate body of semicircle shape, and delineates on the circular arc limit of its transparent panel body 180 ° degree measure stroke line 11 is arranged.

As shown in Figure 4, offering one at the circle centre position of the described semicircle shape plate body of protractor 1 and be step-like perforation 12, and the benchmark bottom lines 111 of described 180 ° of delineation lines 11, is to be that color is constituted with contrastive colours of being different from all the other delineation lines 11; Auxiliary scale 2 is one to be the transparent plate body of rectangular sheet, the blade length of auxiliary scale 2 diameter with protractor 1 approximately is suitable, and on the centre bottom face of blade be moulding be provided with one be hollow form hold projection 21, the described step perforation 12 that holds projection 21 and protractor 1 is fastened mutually, delineation has one to indicate line 22 on vertical central axial line of auxiliary scale 2 blades in addition, and is provided with some equidistant through holes 23 in described sign line 22.

Utilize above-mentioned member, make auxiliary scale 2 can by its hold that projection 2 embeds in the perforation 12 and with protractor 1 button knot location mutually, making the perforation that auxiliary scale 2 can described protractor 1 is the free turn in the center of circle.Like this, just can make protractor 1 collocation auxiliary scale 2 when it indicates the mutual mapping of line 22 and delineation line 11, and obtain auxiliary scale 2 and protractor 1 pairing angle angle smoothly.

Secondly, as shown in Figure 5, described auxiliary scale 2 is in the bottom that holds projection 21 shafts, be form one broad 211, on described broad 211 step surface that just in time is fastened in the perforation 12 and unlikelyly deviate from easily.Except that this, because of the diameter length of the blade length of described auxiliary scale 2 and protractor 1 suitable, so when auxiliary scale 2 combines with protractor 1, described auxiliary scale 2 is to be attached at can't protrude protractor 1 original size on the root edge limit of protractor 1 and bring inconvenience outward, helps the utility model to be convenient to carry use.

The delineation line 11 of described protractor 1 normally adopts the line body with black to be become, in the utility model, can can know the angle that manifests its angle significantly with the sign line 22 of auxiliary scale 2 for making its benchmark bottom line 111, so with benchmark bottom line 111 and to indicate line 22 is that color is constituted with the contrastive colours that are different from all the other delineation lines, make the user at a glance interpretation go out angle or do the action of measurement contraposition apace.

Moreover, the utility model measures angle except that the drawing that can be applicable to the plane or draws the angle, and it is extremely shown in Figure 9 as Fig. 6, it uses practical range can extend on the angle measurement that is applied to some geometry solid object, measurement as its two sides angle angle of Figure 6 and Figure 7 polygon solid object, or as measurement of Fig. 8 and its tapering angle of taper solid object shown in Figure 9 or the like, the extensive degree of its range of application is that general quantity hornwork institute is incomparable.

Therefore, the utility model especially at school age the child have auxiliaryly greatly for the measurement of angle, and utilize the folding degree of auxiliary scale 2 and protractor 1, more can make the school age child to some extent directly relatively reach understanding to " angle ".

In addition, auxiliary scale 2 in the utility model is to unload and independent the use from protractor 1 alone, as shown in figure 10, be used in to dash on the blade to establish and somely be the through hole 23 of suitable spacing and give change application, at first select the through hole 23 (12 uses of also can selecting to bore a hole) of two selected spacings, two tools 3 are inserted its nib respectively in the selected two through hole 23, a selected tool 3 is motionless for fixed point, is the center winding with another tool 3 according to a fixed point tool 3, if this can draw out with two selected through holes 23 on drawing is the circle or the arc of radius size, make the school age child can see through the activity of making and more understand the center of circle, radius, diameter, the connotation of circumference etc.

Claims (5)

1, a kind of protractor with auxiliary scale comprises a protractor and an auxiliary scale, and described protractor is semicircle transparent plate body, and delineation has 180 ° degree measure stroke line on its circular arc limit, it is characterized in that,

Circle centre position at the semicircle plate body of described protractor offers a perforation;

Described auxiliary scale is transparent rectangular sheet, and its length is not more than the diameter of described protractor, is provided with a projection that holds that is hollow form at the centre bottom face of described auxiliary scale, and delineation has one to indicate line on vertical central axial line of described auxiliary scale;

Described auxiliary scale holds by it that projection embeds in the perforation of described protractor and button knot location mutually with it, and making described auxiliary scale can described perforation be the free turn in the center of circle.

2, the protractor with auxiliary scale according to claim 1 is characterized in that, the color of the benchmark bottom line of described protractor and the color of the sign line on the described auxiliary scale are inequality.

3, the protractor with auxiliary scale according to claim 1 is characterized in that, is provided with some equidistant through holes along the sign line on the described auxiliary scale.

4, the protractor with auxiliary scale according to claim 1 is characterized in that, is demountable structure between described auxiliary scale and the described protractor.

5, the protractor with auxiliary scale according to claim 1 is characterized in that, the described bottom that holds projection of described auxiliary scale is a broad portion, and described broad portion is fastened on the step surface in the described perforation and unlikelyly deviates from easily.

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