CN2250264Y - Two-purpose campasses for circle and ellipse - Google Patents

Abstract

The utility model relates to two-purpose compasses for circles and ellipses. Individual structure of common compasses is slightly changed, auxiliary compasses having a special structure is added, and ellipses with unequal sizes can be drawn. The utility model can be used for teaching, engineering drawing, project scribing, etc., and the operation is convenient.

Description

Round, oval double-purpose rule

The utility model relates to a kind of circle of can doing can make oval instrument again, is applicable to teaching, designing and mapping, engineering line setting-out.

At present, the known way of making ellipse is: 1, adopt drawing template; 2, adopt descriptive geometry to draw.The former is easy, but size is restricted; Latter's size is unrestricted, but finds the solution loaded down with trivial details.

The purpose of this utility model provides a kind of circle of can doing can do oval double-purpose rule again.

The purpose of this utility model is achieved in that a common drawing, compasses for teaching, close up the place on its supporting leg top with fixedly connected connection, link top close-fitting has a shape handle, a hinge is respectively established in appropriate location, two supporting leg bottoms, hinge bottom (limb) is location syringe needle and (another limb) powder (lead) pen clip head, locatees syringe needle and respectively establishes a truckle above powder (lead) the pen clip head.In addition, increase the rule of paying of making oval usefulness.Paying the rule top is provided with and can moves the borehole jack of joining with the axle shape hand axle at compasses top, the borehole jack cylindrical has a spring to be attached thereto, the other end of spring links to each other with telescoping tube, the telescoping tube bottom, also payable at sight rule lower limb also are provided with hinge, the hinge bottom is powder (lead) pen clip head, establishes a truckle above powder (lead) the pen clip head.Do when oval the borehole jack of paying the rule top by on the axle shape handle that enters the compasses top, walk around two pulleys of compasses and pay the pulley of rule with a ring-type rope yarn again, by the tension force of paying the rule spring, tensioning ring-type rope yarn, make the location syringe needle of compasses, powder (lead) the pen clip head of powder (lead) pen clip head and pair rule becomes the tripartite confrontation state with in one plane.Axle shape handle with the compasses top is the center, rotates the borehole jack of paying rule, pays the rule lower limb under the constraint of ring-type rope yarn, changes around compasses two supporting legs.Point-blank the time, promptly be the long axis of ellipse position, otherwise promptly be oval minor axis location with compasses two supporting legs when paying rule.If draw the ellipse that differs in size, as long as the telescoping tube length of rule is paid in adjusting, regulate the span of compasses two supporting legs, regulate the girth of ring-type rope yarn, can finish.Take down and pay rule, compasses are pressed normal condition work can the picture circle.

Change structure and structure as long as the utility model will generally be mapped a little with compasses, but do not lose the original function of compasses, and increase mentioned above pair of rule, can realize the ellipse that picture differs in size.Simple in structure, easy to operate, be widely used.

The concrete structure of utility model is provided by following embodiment and accompanying drawing thereof.

Accompanying drawing is a structural map of the present utility model

Among the figure 1, handle (axle) 2, fixedly connected 3, supporting leg 4, hinge

5, pulley 6, location syringe needle 7, powder (lead) pen clip head

8, powder (lead) pen clip head 9, pulley 10, hinge 11, telescoping tube

12, spring 13, borehole jack

In Fig. 1, handle (1) is contained in the top of fixedly connected (2), (3) 2 tops of supporting leg are contained in fixedly connected (2) lining with the pin flat raft, hinge (4) is in two supporting leg bottoms, can make location syringe needle (6) powder (lead) the pen clip head (7) of the lower end of supporting leg can both be in blackboard or drawing or the perpendicular contact of engineering body, (5) 2 on pulley is contained in two supporting leg bottoms respectively, powder (lead) pen clip head (8) is contained in pays the rule bottom, pulley (9) passes through on a horizontal level with the ring-type rope yarn mutually together with all the other 2 pulleys (5), rotate flexibly, accurately finish and do oval action, dumpling point (10) function is identical with (4), telescoping tube (11) can be regulated the length of paying rule, the ellipse that its size of drawing is not waited.Spring (12) both can have been regulated the angle between pair rule and the compasses supporting leg, can make again to pay to advise to be in tensioning state when making ellipse, and borehole jack (13) is contained in pays a rule top, can cooperate with axle (1), and making pair rule is that the center rotates with axle (1), draws oval.

Claims (2)

1, round, oval double-purpose rule, on common drawing compass instrument, increase by payment rule, it is characterized in that: the top has with compasses top axle shape handle moves the borehole jack of joining, the borehole jack cylindrical has spring to link to each other, the spring other end links to each other with telescoping tube, the telescoping tube bottom is provided with hinge and truckle, and foot is powder (lead) pen clip head.

2, circle according to claim 1, oval double-purpose rule, it is characterized in that: fixedly connected the last axle shape handle in the top of compasses instrument, a pulley is respectively adorned in the appropriate location of its two supporting legs bottom, and respectively establishes a hinge.

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