CN87200107U

CN87200107U - Compass with scale

Info

Publication number: CN87200107U
Application number: CN 87200107
Authority: CN
Inventors: 刘超
Original assignee: Individual
Current assignee: Individual
Priority date: 1987-01-08
Filing date: 1987-01-08
Publication date: 1987-11-04

Abstract

The utility model discloses a compass with a sale, which is relevant to drawing articles. A graduated scale is additionally arranged on the leg rod of a common herringbone compass, that is, when a circle is drawn, people read a radius from the scale to draw the circle. The use is convenient and flexible.

Description

Compass with scale

A kind of scale compasses relevant with drawing article, can be directly from the scale reading draw the circle of required size, for mapping is provided convenience.

The herringbone compasses of selling drawing usefulness in the general city all do not have graduated scale, and the bowlder of at every turn drawing certain size must strut compasses two foots earlier, measures required size and justify on chi, and is very inconvenient.

The purpose of this utility model is convenient in order to draw the circle mapping.On the leg bar of existing compasses, fix a scale, strut the compass leg bar and can directly measure required size, thereby make the circle of required size, improve service efficiency from scale.

The purpose of this utility model is achieved in that to make two leg pole lengths of existing compasses certain, on the leg bar, fix a scale mechanism, this scale mechanism is the transparent plastic sheet of a band stria, below stria, indicate scale, end at scale is made arch, so as compasses when drawing in scale screw out.Sustained height position at compasses two leg bars, establish a little screw on the bar of a left side, establish a pin hole on the right bar, the scale thin slice of trough of belt is hinged on the leg bar of compasses with screw then, pin on another leg bar is embedded in the slotted eye of scale, the pin center to the scale label value of aiming at, is the radius of the circle that compasses can be done this moment along vertically.When compasses closed up, scale also can forward to compasses flat folded around the screw threads of left bar, takes up an area of seldom, is convenient to lay.

Fig. 1, be schematic diagram of the present utility model.

Fig. 2, the schematic diagram when drawing in for the utility model.

Embodiment 1

Scale of the present utility model is the transparent plastic sheet of a band stria, and stria is wide 1.5 millimeters, makes arch at an end of scale, so that scale screws out.Length of the scale should be decided according to the big ting model of compasses, and the leg bar of comparable compasses is short, and compass leg bar as shown in fig. 1 is about 120 millimeters, long 82 millimeters of its scale.Scale label forms with the plastic tab molding, and its graduated scale method is: the scale value that pin center in the vertical direction is aimed at is the distance between this moment of the compasses two leg tips, also the radius of a circle that promptly this moment, compasses can be drawn.

To use compasses two leg pole lengths always and fix, and in the certain altitude position of leg bar scale will be set, its method to set up is to establish the screw that a diameter is the M1.5 millimeter at the center of a leg bar, and another leg bar is established a little pin.The position of scale should not be too high to be placed on clamp the Pencil joint holder screw top for well, and too high scale is lacked very much the precision that influences reading.Again that plastic tab scale and the thin screw of left leg bar is hinged, scale can freely be rotated around screw, the pin on the right leg bar then embeds in the scale stria seam, makes the corresponding required size in pin center, just can make the circle of required size.

Embodiment 2

As the scale of embodiment 1 described scale compasses, the available metal thin slice is made, and its scale can be made with the photofabrication method.

Claims

1, a kind of scale compasses that are used to draw is characterized in that adding the scale mechanism of a band scale on common herringbone compass leg bar.

2, as the said scale compasses of claim 1, it is characterized in that in the said scale mechanism stria being arranged, be equipped with pin on the right leg bar of compasses, pin embeds in the scale stria, can change with the compasses subtended angle and indicate reading, this scale of time spent not can rotate around the axis flat folded with compasses.

3, as the said scale compasses of claim 1, it is characterized in that said scale is to make with plastic sheet, also the available metal sheet is manufactured.