CN2264090Y - Compasses - Google Patents

Abstract

The utility model relates to compasses, particularly the 'pulling'-typed compasses. The utility model is composed of a drawing arm 1, a painting brush holding frame 2, a center of a circle apex 3, a sliding pull-ring 11, etc. The drawing arm 1 is the telescopic drawing arm, and length graduation is arranged on the drawing arm. A dial 7 for measuring a central angle is arranged on the center of the circle apex 3. Various painting brushes, such as a pencil, a chalk, etc. can be held on the painting brush holding frame 2. The desired circles and circular arcs can be stably and exactly drawn on a blackboard, paper or other interfaces. The parameters of a radius, the circular arc and the central angle can be directly read.

Description

Compasses

A kind of culture and education drawing appliance, particularly a kind of compasses.

Compasses and engineers and technicians or the used common compasses of student that present teacher uses on blackboard, be to control drawn radius of a circle by the intersecting angle of adjusting picture arm and centering pole, rotate whole compasses as the center with handle with centering pole when using and come the picture circle, it is loosening easily to draw arm when the shortcoming of this compasses is to use, whether the center of circle also slided easily and caused drawn circle or not, and its central angle and radius can't directly be read when drawing circle and circular arc.

It is a kind of no matter at still can both draw accurately and easily on the paper on the blackboard needed circle or circular arc that the purpose of this utility model is to provide, and can chalk, the novel bow compass of multiple paintbrush dual-purposes such as pencil, pen.

The technical solution of the utility model is as follows: a kind of compasses comprise that picture arm (1), paintbrush control frame (2), the center of circle top (3).

Drawing arm (1) is a kind of telescopic picture arm of being made up of a joint conduit at least, picture arm (1) is gone up mint-mark the scale (21) that can directly read drawn radius of circle, drawing arm (1) is actively socketed in the sleeve pipe (5), one central angle tuning drive gear (6) is arranged on the sleeve pipe (5), be fixed with paintbrush on (1) termination of picture arm and control frame (2); One dial (7) that indicates center of circle angle is arranged on the center of circle top (3), the center of circle top (3) is fixedly linked with axostylus axostyle (8), the upper end of axostylus axostyle (8) is connected with one handle (13), have " I " font groove (9) that connects once axis on the axostylus axostyle (8), the outer pipe (10) that is with of axostylus axostyle (8), pipe (10) wall upper edge axis symmetry has two helical flutes (16) (17), an outer slip draw ring (11) and the stage clip (12) of being with of pipe (10), stage clip (12) is placed between slip draw ring (11) and the handle (13), a pair of hole (14) (15) in the center of circle, same horizontal plane upper edge symmetry is arranged, axostylus axostyle (8) on slip draw ring (11) wall, pipe (10), between slip draw ring (11) three via groove (9), helical flute (16) (17), circular hole (14) (15) has crossed a sliding bar (18); Sleeve pipe (5) is fixedly linked with the lower end of pipe (10).

Equal or be slightly larger than 1 pitch length as the length of the stroke height of helical flute of the present utility model (16) (17) as described in the above-mentioned scheme and groove (9).

Advantage of the present utility model is that the picture bowlder is accurate, stable, easy to use, and " one draws promptly " can use multiple paintbrush, and can directly learn the center angle of drawn radius of a circle or circular arc.

1-3 makes a more detailed description the utility model by embodiment below in conjunction with accompanying drawing.

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is the schematic diagram of the utility model axostylus axostyle.

Fig. 3 is the cross-sectional view of the utility model slip draw ring.

Embodiment:

A kind of compasses, comprise that picture arm 1, paintbrush control frame 2, the center of circle top 3, drawing arm 1 is that a kind of scalable adjusting of length cross section that is formed by some joint conduit headtotails is square picture arm, draw the scale 21 that is carved with mensurable radius length on the arm 1, drawing arm 1 is enclosed within the sleeve pipe 5, degree of tightness cooperates suitably, and an end of picture arm 1 and paintbrush are controlled frame 2 and be fixedly linked, and paintbrush is controlled and had adjustable holding screw 19 on the frame 2 to adapt to the needs of different thicknesses paintbrush 20; The center of circle is top to be conical, one circular scale that indicates center of circle angle is arranged on it, the awl bottom surface and the axostylus axostyle 8 in the center of circle top 3 are fixedly linked, the upper end of axostylus axostyle 8 is with the one handle 13 that is threaded, have " I " font groove 9 that connects once axis on the axostylus axostyle 8, axostylus axostyle 8 overcoats a pipe 10, and pipe 10 wall upper edge axis symmetries have two helical flutes 16,17, be with a slip draw ring 11 and a stage clip 12 from the bottom to top outside the pipe 10, the upper end apical grafting of stage clip 12 handle 13; Have a pair of on slip draw ring 11 walls at grade with the hole 14,15 of center of circle symmetry, crossed a sliding bar 18 by groove 9, helical flute 16,17, circular hole 14,15 between axostylus axostyle 8, pipe 10, slip draw ring 11 threes, the diameter of the width of groove 9, helical flute 16,17 and circular hole 14,15 matches with the outside dimension of sliding bar 18, and the stroke of helical flute 16,17 and the length of groove 9 should equal or be slightly larger than 1 pitch length of helical flute 16,17.Hold handle 13 with the palm of the hand during use and compress compasses downward vertically, forefinger and middle finger pulling slip draw ring 11 just can be converted into circular motion with rectilinear motion, thereby draw required circle or circular arc, its radius or central angle (radian of circular arc) can directly be read by scale.

Claims (2)

1. compasses comprise that picture arm (1), paintbrush control frame (2), the center of circle top (3), it is characterized in that the picture arm is a kind of telescopic picture arm of being made up of a joint conduit at least, draw that mint-mark has the scale (21) that can directly read drawn radius of circle on the arm (1); Draw arm (1) and be actively socketed in the sleeve pipe (5), also have a central angle tuning drive gear (6), an end of picture arm (1) to control frame (2) on the sleeve pipe (5) and fixedly connected with paintbrush; One dial (7) that indicates center of circle angle is arranged on the center of circle top (3), the center of circle top (3) is fixedly linked with axostylus axostyle (8), there is one handle (13) upper end of axostylus axostyle (8), have " I " font groove (9) that connects once axis on the axostylus axostyle (8), the outer pipe (10) that is with of axostylus axostyle (8), pipe (10) wall upper edge axis symmetry has two helical flutes (16), (17), an outer slip draw ring (11) and the stage clip (12) of being with of pipe (10), stage clip (12) is placed between slip draw ring (11) and the handle (13), and a pair of hole (14) in the center of circle, same horizontal plane upper edge symmetry is arranged on slip draw ring (11) wall, (15); Crossed a sliding bar (18) via groove (9), helical flute (16), (17), circular hole (14) (15) between axostylus axostyle (8), pipe (10), slip draw ring (11) three, sleeve pipe (5) is fixed on the lower surface of pipe (10).

2. compasses according to claim 1 is characterized in that the length of the stroke height of helical flute (16), (17) and groove (9) equals or be slightly larger than the length of the pitch of 1 helical flute (16) (17).

Images