CN2139064Y - Multipurpose terrestrial magnetic positioning plane straight line ruler - Google Patents

Abstract

The utility model relates to a multipurpose terrestrial magnetic positioning plane straight line ruler, comprising a straight line rim ruler body. At least one indicator which is provided with a 0-360 DEG dial plate and uses a permanent-magnet positioning needle for indicating is arranged at about the middle part of the straight line rim ruler body. Because the permanent-magnet positioning needle is always directed to the south and north pole directions, the positioning can be realized by depending on the permanent-magnet positioning needle, and the measuring and drawing of various angles, straight lines, and parallel lines can be realized.

Description

Multipurpose terrestrial magnetic positioning plane straight line ruler

The utility model relates to measuring instrument, more specifically to a kind of plane and straight line chi.Comprise that has at least one a linear edge plane ruler body.For example: ruler, set square, half-round compasses etc.

Above-mentioned existing straightedge rule is that common being used to measured length or be used for the instrument of picture straight line, if when being used for picture angle or parallel lines, then general ruler is just powerless.So just use protractor or instrument of surveying and mappings such as set square, T-square, thereby very trouble that just seems.

For this reason, the purpose of this utility model provides a kind of instrument of surveying and mapping of novelty, it can overcome the defective of general straightedge rule in the above-mentioned prior art, that is have a function of specially using more, linear measure longimetry, drawing straight line can not only be used for, and angular surveying and drafting can be used for, the drafting of parallel lines and measurement, and it is simple in structure, easy to manufacture, easy to use.

For achieving the above object, the utility model is taked as next measure: the straightedge rule of a routine, and as ruler, set square, half-round compasses etc.Of the present utility model being characterised in that: general in the centre position on line correspondence limit, be installed with a indicator at least with a permanent magnetism pilot pin of the floated arrangement of mechanical support formula with 0～360 ° of scale.Wherein the plane of the plane of dial and straightedge rule basal surface and pilot pin rotation formation is the face of being parallel to each other substantially.

Another preferred version of the present utility model is, straightedge rule and dial are made one, permanent magnetism pilot pin bolster is installed with in the dial center, an aperture is set at the center of permanent magnetism pin, be nested with then on the axle journal of the upper end of bolster, cover with a transparent dome again with sealing.

Describe the utility model in detail by a specific embodiment in the accompanying drawing below.

Fig. 1 is a kind of structural representation of the utility model earth magnetism plane of orientation straightedge rule;

Fig. 2 be among Fig. 1 straightedge rule of the present utility model overlook the signal body;

Fig. 3 is the cross sectional representation of A-A line among Fig. 1;

Referring to accompanying drawing, numbering 1 is ruler (also can be set square, half-round compasses etc. certainly), and 2 is the scale dial plate, and 3 is the permanent magnetism pilot pin, and 4 is bolster, and 5 is housing, and wherein dial should be made suitable calibration according to required precision in 0～360 ° of scope.Need to prove that in addition supporting of permanent magnetism pilot pin or suspended pattern all are technique known, therefore needn't explain at this, for example: general miniature ball bearing, perhaps general sleeve bearing, the simple support of perhaps general hole and axle cooperates, perhaps also available suspension type etc.In a word, can do suitable selecting for use according to the requirement of manufacturing cost accuracy and sensitivity.Also have the size of permanent magnetism pin also relevant with accuracy, rule is that the permanent magnetism pin is long more accurate more, and the distance of pilot pin and dial is the smaller the better.

Operation principle of the present utility model and using method are: because in same place, the permanent magnetism pin always points to the two poles of the earth, north and south, pretend reference bearing,, how to draw just very convenient with local magnetic orientation so with the plane and straight line chi if do the parallel lines of straight line for mapping and drawing.At first, this chi straight line and existing straight line are coincided, by dial just as can be seen with the angle of permanent magnetism pin, remember this angle value, just can draw parallel lines along the ruler straight line anywhere.

In sum, the utility model has the advantages that significantly, give prominence to. Namely good at many things and expert in one, easy to use, but design easy to manufacture is astute. Not only in drawing, field of measuring technique but also in building, the application of installing very widely practical prospect is arranged.

Claims (3)

1, the plane and straight line chi is used in the magnetic orientation of a kind of ground more, comprising: the chi body of straight line is arranged, as set square, ruler, half-round compasses etc.It is characterized in that:

Be installed with a indicator with the permanent magnetism pilot pin of 0～360 ° of scale at the middle part on line correspondence limit.

2, according to the straightedge rule of claim 1, it is characterized in that: straightedge rule and dial are made one, be installed with a support column in the dial central vertical, an aperture be set at the center of permanent magnetism pin be nested with then on the axle journal of support column end, close with a housing again.

3, according to the straightedge rule of claim 2, it is characterized in that: the permanent magnetism pilot pin is made by permanent magnet material, and all the other are to make with transparent nonmetallic materials.