CN209395474U - A compass capable of drawing arcs with arbitrary central angles - Google Patents

Abstract

The utility model discloses a compass capable of drawing an arc at any center angle, which comprises a first compass foot and a second compass foot, the first compass foot is movably connected with the second compass foot, and a rotating circle is arranged on the first compass foot Ball, the rotating ball is covered with a ball sleeve that fits with the gap, and the support rod connected to the ball sleeve is provided with a suction cup; the end face of the ball sleeve is provided with a scale line, and the connecting rod and the support rod The ring sleeve on the top is connected; the first compass foot is provided with a slide block, and a telescopic rod is movably connected between the slide block and the measuring scale; the second compasses foot is fixedly provided with a paintbrush. The utility model is reasonable in design and simple in structure. While drawing a circular arc, the painter can measure the central angle of the drawn circular arc through a scale, and then can realize drawing a circular arc with any central angle, which effectively reduces the labor of the painter. Work difficulty and reduce drawing time, increase the accuracy of drawing arcs.

Description

A compass capable of drawing arcs with arbitrary central angles

technical field

The utility model relates to the field of stationery, in particular to a compasses capable of drawing arcs with arbitrary central angles.

Background technique

Compass is a tool used to draw circles and arcs, and it is one of the indispensable tools in our office and study. One end of the compass in the prior art is a needle point, and the other end is a pen core, and the needle point will often pierce the hand during the taking process, which is dangerous to a certain extent. When in use, the center of the needle point will also pierce the paper due to modification, repetition, etc., affecting writing and aesthetics. In the process of painting, we often require to draw arcs with different radians. At this time, we need to use other measuring tools to measure, which will increase our work intensity and lead to errors.

Utility model content

Aiming at the above-mentioned deficiencies of the prior art, the utility model provides a compass capable of drawing arcs with arbitrary central angles.

For reaching above-mentioned purpose of the invention, the technical scheme that the utility model adopts is:

A compass capable of drawing an arc at any center angle is provided, which includes a first compass foot and a second compass foot, the first compass foot and the second compass foot are movably connected, the first compass foot is provided with a rotating ball, and the rotating circle The upper sleeve of the ball is provided with a ball sleeve matching with its gap, the ball sleeve is connected with a support rod, and a suction cup is arranged on the support rod; the end face of the ball sleeve is provided with a scale line, and a measuring ruler is provided on the scale line, and the measuring scale There is an arc-shaped connecting rod on the top, and the connecting rod is connected with the annular sleeve set on the support rod, and the annular sleeve is movably connected with the support rod; the first compass foot is provided with a slider, and the slider is provided with an "I" shape. The boss is inserted into the "I" shaped chute provided on the first compass pin, and a telescopic rod is movably connected between the slide block and the measuring ruler; the second compasses pin is fixedly provided with a paintbrush.

Further, a laser pointer is provided on the support rod extending into the suction cup, and a switch connected with the laser pointer is provided on the outer wall of the support rod.

Further, a compass head is provided at the junction of the first compass foot and the second compass foot, and a non-slip handle is provided on the compass head.

The beneficial effects of the utility model are as follows: the utility model is a compass that can draw an arc at any center angle, and the support rod is fixed on the center of the arc by setting a suction cup; The two compass feet move in the drawing area, thereby driving the rotating ball to rotate in the ball sleeve to achieve the purpose of drawing an arc. A laser pointer is installed in the suction cup, which can effectively help the center of the suction cup and the center of the arc to be positioned and reduce errors.

The scale line provided on the end face of the ball sleeve is measured by a measuring ruler, and the measuring ruler is connected with the slide block arranged on the first compass foot through a telescopic rod. When adjusting the length between the two feet of the compasses, the slide block can The chute on the first compass foot moves inward, so that the telescopic rod stretches to prevent damage to the measuring scale; in the process of drawing an arc, the telescopic rod drives the measuring ruler to move along the scale line, thereby achieving the purpose of measuring the central angle of the circle.

The utility model has reasonable design and simple structure. By rotating the handle, the drawer can realize the purpose of drawing a circular arc in the drawing area. At the same time, the scale can be used to measure the central angle of the drawn circular arc, and then the drawing of a circular arc with any central angle can be realized. , which effectively reduces the difficulty of the painter's work and reduces the drawing time, increasing the accuracy of drawing arcs.

Description of drawings

Fig. 1 is a structural schematic diagram of a compass capable of drawing arcs with arbitrary central angles.

Fig. 2 is a schematic diagram of the connection between the slider and the first compass foot.

Figure 3 is a top view of the ball sleeve.

Among them, 1. The first compass foot, 2. The second compass foot, 3. Ball sleeve, 4. Rotating ball, 5. Ring sleeve, 6. Connecting rod, 7. Measuring ruler, 8. Suction cup, 9. Laser Pen, 10, switch, 11, telescopic rod, 12, support rod, 13, painting brush, 14, compass head, 15, handle, 16, slide block, 17, boss, 18, chute.

Detailed ways

The specific embodiment of the present utility model is described below, so that those skilled in the art understand the utility model, but should be clear, the utility model is not limited to the scope of specific embodiment, for those of ordinary skill in the art, as long as Various changes are within the spirit and scope of the utility model defined and determined by the appended claims, and these changes are obvious, and all inventions and creations utilizing the concept of the utility model are all included in the protection list.

As shown in Figure 1, a compass that can draw an arc at any central angle includes a first compass foot 1 and a second compass foot 2, and the first compass foot 1 and the second compass foot 2 are connected by a movable hinge. The junction of the pin 1 and the second compasses pin 2 is provided with a compass head 14, and the compass head 14 is provided with a handle 15; the first compasses pin 1 is provided with a rotating ball 4, and the rotating ball 4 is covered with a The ball cover 3 is connected with a support rod 12, and the end of the support rod 12 is provided with a suction cup 8; the second compass angle is provided with a paintbrush 13.

As shown in Figure 3, the scale line of measuring angle is provided on the ball sleeve 3, and the scale line is measured by setting a scale 7 on the scale line. The scale line 7 is provided with an arc-shaped connecting rod 6, and connected The rod 6 is close to the outer arc surface of the ball sleeve 3 , the connecting rod 6 is connected with the annular sleeve 5 sleeved on the support rod 12 , and the annular sleeve 5 is movably connected with the support rod 12 .

As shown in Figure 2, on measuring ruler 7, also be connected with telescoping rod 11 by living hinge, the other end of telescoping rod 11 is connected with the slide block 16 that is arranged on the first compasses pin 1 by living hinge; Set on slide block 16 There is an "I"-shaped boss 17, and the first compass foot 1 is provided with an "I"-shaped chute 18 cooperating with the "I"-shaped boss 17.

When this program was implemented, a laser pointer 9 was installed on the support rod 12 in the inner center of the suction cup 8, and the switch 10 of the laser pointer 9 was arranged on the outer wall of the support rod 12; The center of the circle and the design of the laser pointer 9 can well assist the alignment of the center of the suction cup 8 and the center of the arc, reducing drawing errors; when adjusting the distance between the two feet of the compass, the slider 16 can go up and down along the chute 18 Move, telescopic rod 11 stretches simultaneously, prevents when adjusting the distance between two feet, damages measuring scale, increases the radius range that can draw arc simultaneously, increases the practicability of compasses.

In the process of drawing an arc, the painter drives the paintbrush 13 on the second compasses pin 2 to draw an arc in the drawing area by rotating the handle 15, while the rotating ball 4 rotates in the ball sleeve 3 to realize the drawing of an arc. Purpose: Driven by the telescopic rod 11, the measuring ruler 7 rotates along the scale following the first compass foot 1, so as to achieve the function of measuring the central angle of the arc, and then realize the purpose of drawing any central angle.

The utility model has reasonable design and simple structure. By measuring the central angle of the drawn arc while drawing the arc, the purpose of drawing any central angle can be realized; The shortcomings of other measuring devices for measurement, reduced work steps when drawing arcs, shortened drawing time, improved drawing efficiency, and greatly reduced drawing errors.

Claims (3)

1. the compasses that one kind can draw any central angle circular arc, which is characterized in that including the first compass foot (1) and the second compass foot (2), first compass foot (1) is flexibly connected with the second compass foot (2), is provided with rotational circle on first compass foot (1) Ball (4), it is described to rotate the ball set (3) being arranged on ball (4) with its clearance fit, branch is connected on the ball set (3) Strut (12) is provided with sucker (8) on the support rod (12)；It is provided with graduation mark on the end face of the ball set (3), it is described Be provided on graduation mark measuring rule (7), be provided with the connecting rod (6) of arc on the measuring rule (7), the connecting rod (6) with Annular sleeve (5) connection being set on support rod (12), the annular sleeve (5) are flexibly connected with support rod (12)；Described first It is provided on compass foot (1) sliding block (16), the boss (17) of I-shaped, the boss (17) is provided on the sliding block (16) It is living between the sliding block (16) and measuring rule (7) in the sliding slot (18) for plugging the I-shaped opened up on the first compass foot (1) It is dynamic to be connected with telescopic rod (11)；Paintbrush (13) are fixedly installed on second compass foot (2).

2. the compasses according to claim 1 for drawing any central angle circular arc, which is characterized in that extend to the sucker (8) it is provided with laser pen (9), is provided on the outer wall of the support rod (12) with laser pen (9) even on the support rod (12) in The switch (10) connect.

3. the compasses according to claim 1 for drawing any central angle circular arc, which is characterized in that first compass foot (1) it is provided with compasses head (14) with the junction of the second compass foot (2), is provided with Anti-slip handle on the compasses head (14) (15)。