CN2112515U

CN2112515U - Stretchable compasses

Info

Publication number: CN2112515U
Application number: CN 91217786
Authority: CN
Inventors: 赵动仪; 黄玮
Original assignee: Individual
Current assignee: Zhao Youyi
Priority date: 1991-07-12
Filing date: 1991-07-12
Publication date: 1992-08-12

Abstract

The utility model relates to stretchable compasses which can draw circulars whose diameters from 2 millimeters to 2000 millimeters. The utility model is characterized in that a stretchable rod is provided with a slide position ring which can free slide and fix position, a drawing pen head is connected with the slide position ring by a pen holder, and each stage of the stretchable rod is provided with a guide groove. Owing to the stretching movement of the stretchable rod, the size of the drawing diameter is enlarged, and the use range of the compasses is widened. Besides the technical drawing, the utility model can be used in the extensive field such as building construction and blackboard teaching. The utility model has the advantages of small size, convenience for carrying, convenient operation and easy fabrication.

Description

Stretchable compasses

The utility model relates to a kind of novel drawing compass of diameter from 2 millimeters to 2000 millimeters circle that draw.

This drawing instrument of compasses has long history, all be unable to do without it in various fields such as study, scientific research, drawing.But because compasses have two isometric rule pin, the radius of a circle that can draw is very limited, is needing the bowlder of picture diameter more than 400 millimeters, must connect an extension bar that is about 100 millimeters, the compasses greatest circle that can draw like this, and diameter can reach 600 millimeters.For the circle of the larger diameter of drawing, people have to make large-scale compasses with rule pin lengthening, but the too big inevitable benzene of compasses is heavy, carry very inconveniently, and operation also being not easy, and for example large-scale wooden educational compasses because the rule pin is oversize, causes operation painstaking, the centering difficulty.

The purpose of this utility model is the miniature roundlet that a kind of 2 millimeters of diameters of both can having drawn will be provided, the compasses of the huge great circle of 2000 millimeters of the diameters of can drawing again, and volume can dwindle, processing ease carries very convenient.

The purpose of this utility model is achieved in that a sliding position ring that is free to slide only on the drawing and pulling type expansion link of a vary in length, sliding position ring can tightly be fixed on the expansion link by the navigation button of a side, the opposite side of sliding position ring is connected with Pencil joint holder, and the direction by directed button locking Pencil joint holder, Pencil joint holder connect the plotting head that a hole can be inserted to be needed, first-class as pencil stub, ruling pen.The thin boom end of innermost layer one-level in expansion link has a connector, connector groove in a centering stitch is arranged, the centering stitch can turning cylinder be the axle center rotation, makes centering pin always vertical with the institute drawing surface.On each level of expansion link, direction recess is all arranged, direction recess matches step by step, makes the stretching of expansion link and shrinks along the straight line translation, thereby centering pin and drawing pen are always remained in the same plane.

The utility model is compared with common compasses, structure is simple equally, and volume does not increase basically, except that the performance with common compasses, the huge great circle that also can draw 2000 millimeters of diameters, be three times that common compasses connect maximum gauge circle that lengthening can draw behind the pin, and, be radius with whole expansion link owing in drawing round process, be rotating shaft with the centering pin, center of gravity is almost being pasted the drawing drawing, centering is stable, moves freely, and drawing effect is splendid.It is also important that expansion link can be shunk after finishing using, volume is small and exquisite, it is very convenient to carry.Therefore, this compasses also can be used for black board teaching, civil construction etc. more in the extensive fields except that can be used for general the drawing, bring convenience to people.

Concrete structure of the present utility model is provided by following examples and accompanying drawing thereof.

Fig. 1 is telescopic compasses organigram.

Fig. 2 is the schematic diagram that telescopic compasses are drawn the minor diameter circle.

Fig. 3 is the schematic diagram that telescopic compasses are drawn huge great circle.

As shown in Figure 1, (1) is expansion link, and (2) are the end handle, (3) be sliding position ring, (4) are navigation button, and (5) are directed button, (6) be Pencil joint holder, (7) be fixing button, (8) for connecing a hole, (9) are plotting head, (10) be connector, (11) be the centering stitch, (12) are the stitch handle, and (13) are centering pin.

As shown in Figure 2, drawing the minor diameter bowlder, telescopic compasses are identical with the using method of common drawing compass, to slide position ring (3) is fixed on the appropriate location, and make centering pin (13) vertical with the drawing drawing, and pinching end handle (2) with hand, required circle can draw.

As shown in Figure 3, when the huge great circle of needs picture, it is neighbouring fixing sliding position ring (3) can be slided into always end handle (2), then expansion link (1) is pulled out step by step, and be the axle center with turning cylinder (16), in groove (15), rotate centering pin pin (11), make centering pin (13) vertical, pinch stitch handle (12) on the other hand with the drawing drawing, to grasp centering pin (13) is axis of rotation, the another hand pinches navigation button (4), rotates expansion link (1), and required figure can draw.Owing to direction recess (14) is arranged on the expansion link (1), thus in the process of using telescopic compasses, centering pin (13) and drawing pen (9) always in same plane, thereby guarantee to draw accurately.

The utility model adopts the hollow metal pipe manufacturer, and therefore more common compasses are saved material, owing to do not need the cooperation of two rule pin, manufacturing process is also simpler again.

Claims

1, the telescopic compasses of a kind of diameter that draws from 2 millimeters to 2000 millimeters circles, these compasses have the drawing and pulling type expansion link (1) of a vary in length, reach the end handle (2) in its end, it is characterized in that:

(A) a sliding position ring (3) that can be free to slide is arranged on expansion link (1), sliding position ring (3) can be fixed on by the navigation button (4) of a side on the expansion link (1);

(B) opposite side of sliding position ring (3) is connected with Pencil joint holder (6), and locks the direction of Pencil joint holder (6) by directed button (5), connecing in the hole (8) of Pencil joint holder (6), can insert plotting head (9), and tighten up with fixing button (7);

(C) at the thin boom end of expansion link (1) innermost layer one-level, a connector (10) is arranged, in the groove (15) of connector (10), be connected to centering stitch (11), centering stitch (11) can rotate in groove (15) by turning cylinder (16);

(D) on each level of expansion link (1) direction recess (14) is arranged all, these direction recess match step by step.