CN2696857Y - Instrument for drawing concentric circles - Google Patents

Abstract

The utility model belongs to a drawing instrument, which particularly relates to an instrument for drawing concentric circles. The utility model is composed of a turn knob 1, a rotating shaft 2 and a positioning needle 7, wherein, a plurality of sliding sleeves 4 are movably arranged on the rotating shaft 2 and are fixed to the rotating shaft 2 by fastening screws 5, a ruler 3 with scales is fixed on the sliding sleeves 4, and a ruler sliding sleeve 4-1 is movably arranged on the ruler 3 and is fixed to the ruler 3 by the fastening screws 5; a plumbing arm is fixed below the ruler sliding sleeve 4-1, the lower end of the plumbing arm 6 is provided with a circular fixed slot 9, a screw rod 10 penetrates through the middle part of the fixed slot 9, and a nut 11 is arranged on the screw rod 10. The utility model once can draw a plurality of concentric circles, the radii of the circles can be conveniently adjusted, and the instrument for drawing concentric circles is especially suitable for teaching on blackboards, etc.

Description

The concentric circles plotter

Technical field

The utility model belongs to drawing instrument, particularly a kind of concentric circles plotter.

Technical background

At present, people draw, draw the instrument that figure uses, and are to adopt wooden and metal compasses mostly, can draw circle on the blackboard, on the plane, on the paper, at every turn can only be standardized individual round, can not once draw a plurality of concentric circles, radius of a circle need be measured on chi, uses cumbersome.

Summary of the invention

The purpose of this utility model is to overcome above-mentioned technical deficiency, and a kind of a kind of concentric circles plotter that a plurality of concentric circles radius size can directly be adjusted on plotter that once can mark is provided.

The technical scheme that its technical problem that solves the utility model adopts is: a kind of concentric circles plotter of being made up of major parts such as turn-knob, rotating shaft, pilot pins, be characterized in rotating shaft, being equipped with versatilely several sliding sleeves, sliding sleeve is fixed with holding screw and rotating shaft, the graduated scale of fixed band on the sliding sleeve, on scale, adorn sliding sleeve versatilely, sliding sleeve and scale are fixed with holding screw, fix a plumbing arm below the sliding sleeve, the plumbing arm lower end is provided with circular holddown groove, be installed with screw rod in the middle of the holddown groove, nut is housed on the screw rod.

The utility model beneficial effect is: once can mark several concentric circles, radius of circle can be adjusted easily, is particularly suitable for use such as teaching on blackboard.

Description of drawings

Specify with embodiment below in conjunction with accompanying drawing.

Fig. 1 shows concentric circles plotter front view.

The vertical view of Fig. 2 diagrammatic sketch 1.

Among the figure, the 1-turn-knob; The 2-rotating shaft; The 3-scale; The 4-sliding sleeve; 4-1-chi sliding sleeve; The 5-holding screw; The 6-plumbing arm; The 7-pilot pin; 8-locatees paste block; The 9-holddown groove; The 10-screw rod; The 11-nut

The specific embodiment

With reference to accompanying drawing, a kind of concentric circles plotter of forming by major parts such as turn-knob 1, rotating shaft 2, pilot pins 7, be characterized in being equipped with versatilely in the rotating shaft 2 four sliding sleeves 4, sliding sleeve 4 usefulness holding screws 5 are fixing with rotating shaft 2, be provided with the hole in the middle of rotating shaft 2 lower ends, adorn a pilot pin 7 in the hole versatilely, pilot pin 7 usefulness holding screws 5 are fixing, a location paste block 8 is fixed in the termination, be provided with the hole in the middle of the location paste block 8, pilot pin 7 can pass freely through, and when drawing bowlder on the paper or on the plank, pin can be worn out fixing the use from the hole again; On blackboard, draw bowlder, can be with in the pilot pin 7 withdrawal holes, with location paste block 8 location; Chi sliding sleeve 4-1 and scale 3 usefulness holding screws 5 are fixing, fix a plumbing arm 6 below the chi sliding sleeve 4-1, and plumbing arm 6 lower ends are provided with circular holddown groove 9, in order to dress chalk or pencil; Be installed with screw rod 10 in the middle of the holddown groove 9, nut 11 is housed on screw rod 10, chalk or pencil are packed into behind the holddown groove 9, with nut 11 it are held under the arm; Be threaded between turn-knob 1 and the rotating shaft 2.

Using method: at first pen is contained in the holddown groove 9 of plumbing arm 6 lower ends, is fixed, on scale 3, adjust sliding sleeve 4, determine radius size, aim at location, the center of circle with pilot pin 7 or location paste block 8 again, rotate turn-knob 1 and can mark with nut 11.

Claims (1)

1, a kind of concentric circles plotter, by turn-knob (1), rotating shaft (2), pilot pin (7) is formed, it is characterized in that in rotating shaft (2), adorning versatilely several sliding sleeves (4), sliding sleeve (4) is fixing with holding screw (5) and rotating shaft (2), sliding sleeve (4) is gone up the graduated scale of fixed band (3), on scale (3), adorn chi sliding sleeve (4-1) versatilely, chi sliding sleeve (4-1) is fixing with holding screw (5) with scale (3), fix a plumbing arm (6) below the chi sliding sleeve (4-1), plumbing arm (6) lower end is provided with circular holddown groove (9), be installed with screw rod (10) in the middle of the holddown groove (9), nut (11) is housed on the screw rod (10).

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