CN206598656U - Push type compasses - Google Patents

Abstract

The utility model is a push-type compass, which avoids the phenomenon that the center of the circle is not uniform due to inconvenient operation or trembling of hands in the process of drawing a circle. The utility model comprises a base, the lower end of the base is equipped with a positioning needle and a suction cup, the lower end of the suction cup is lower than the needle point of the positioning needle, the base is inserted with a connecting shaft, the upper end of the connecting shaft is fixed to the box, and the upper end of the box is movable. The piston rod protrudes from the upper surface of the box, and the lower end of the piston rod is closely connected with a slide plate. The slide plate is provided with a horizontal long hole. One side of the box is connected to the crank wheel through the rotating shaft, and a horizontal crank pin is installed on the edge side of the crank wheel. , the crank pin is inserted into the long hole, the rotating shaft is located at the outer end of the box body, and the first bevel gear that rotates together with the crank wheel is fixed on the connecting shaft, and the second bevel gear that meshes with the first bevel gear is connected to the connecting shaft, and the second bevel gear A ruler is installed on the outside, and a brush that can slide horizontally on the ruler is installed on the ruler.

Description

push compasses

technical field

The utility model relates to a drawing tool, in particular to a pressing compasses.

Background technique

In mathematics and drawing, a compass is a tool used to draw a circle or a chord, and is often used for drawing with a ruler. Compasses are usually made of metal and consist of two parts connected by a hinge, which can be adjusted. Now it is more common to use two-legged compasses. A positioning pin is installed at the end of one compasses, and a chalk, pencil or duckbill tip is installed at the end of the other compasses. Now the circle is drawn manually by rotating the rotating handle on the upper side of the compasses or by rotating it. axis to complete the drawing of the circle.

In the method of manually rotating the compass, the hand needs to rotate a circle, and the whole arm will be particularly uncomfortable. In addition, during the rotation process, due to the trembling of the hand, it is easy to cause the center of the circle to be different, and the drawn circle will be deformed to a certain extent.

Utility model content

In view of the above situation, in order to overcome the defects of the prior art, the utility model provides a push-type compasses. By pressing the upper parts of the compasses, the drawing of the whole circle can be completed, avoiding inconvenient or Trembling, causing the center of the circle to be different, preventing the drawn circle from being deformed to a certain extent.

The utility model comprises a base, a vertical positioning pin and a transparent sucker are installed on the lower end of the base, the lower end of the sucker is lower than the needle point of the positioning pin, a connecting shaft in a vertical direction is inserted on the base, and a lower end is fixed on the upper end of the connecting shaft. The box whose end surface is parallel to the upper surface of the base constitutes a structure in which the box is fixedly supported on the base through a connecting shaft. The upper end of the box is movable through a piston rod whose upper end protrudes from the upper surface of the box, and the lower end of the piston rod is closely connected with a slide plate. , There is a horizontal long hole on the skateboard, a crank wheel is connected to one side of the box through the rotation of the rotating shaft, and a horizontal crank pin is installed on the edge side of the crank wheel, and the crank pin is inserted into the long hole to form a piston rod that moves up and down to control the rotation of the crank wheel The first bevel gear that rotates together with the crank wheel is fixed at one end of the rotating shaft on the outside of the box, and the second bevel gear that meshes with the first bevel gear is rotatably connected to the connecting shaft, and a ruler is installed on the outside of the second bevel gear. A brush that can slide horizontally on the ruler is installed on the ruler.

Preferably, a pressing plate is connected to the upper end of the piston rod, and the outer diameter of the pressing plate is larger than that of the piston rod.

Preferably, the long hole is curved at the dead point.

Preferably, a vertical spring is fixed at the lower end of the pressing plate, and the other end of the spring is fixed on the box body.

Preferably, there are multiple sets of springs, and multiple sets of springs are symmetrically arranged around the piston rod.

The utility model adopts a pressing type to draw a circle, avoiding the phenomenon that the center of the circle is not uniform due to inconvenient operation or trembling of hands during the process of drawing the circle, and prevents the drawn circle from being deformed to a certain extent.

Description of drawings

Fig. 1 is a schematic diagram of the main section of the utility model.

Fig. 2 is the right side view of the utility box.

detailed description

Below in conjunction with accompanying drawing 1 and accompanying drawing 2 the specific embodiment of the present utility model is described in further detail.

As shown in the figure, the utility model includes a base 1, a vertical positioning pin 2 and a transparent suction cup 3 are installed on the lower end of the base 1, the lower end of the suction cup 3 is lower than the needle point of the positioning pin 2, and a vertical positioning pin 2 is inserted on the base 1. The connecting shaft 5 in the straight direction, the upper end of the connecting shaft 5 is fixed with a box body 4 whose lower end face is parallel to the upper end face of the base, forming a structure in which the box body 4 is fixedly supported on the base 1 through the connecting shaft 5, and the upper end of the box body 4 is movable There is a piston rod 11 whose upper end protrudes from the upper surface of the box body 4, the lower end of the piston rod 11 is closely connected with a slide plate 7, and the slide plate 7 is provided with a horizontal long hole 10, and one side of the box body 4 is connected with a crank wheel 6 through the rotation shaft 8 Horizontal crank pin 9 is installed on the edge side of crank wheel 6, and crank pin 9 is inserted in the elongated hole 10 to form a structure in which piston rod 11 moves up and down to control crank wheel 6 to rotate. The first bevel gear 12 that wheel 6 rotates together, is connected with the second bevel gear 13 that meshes with the first bevel gear 12 on the connecting shaft 5, and ruler 14 is installed on the outside of second bevel gear 13, is installed on the ruler 14 Brush 15 sliding horizontally on ruler 14.

For the convenience of pressing, a pressing disc 16 is connected to the upper end of the piston rod 11 , and the outer diameter of the pressing disc 16 is larger than that of the piston rod 11 .

In order to eliminate the dead point during the sliding process of the crank pin 9 in the elongated hole 10, the elongated hole 10 is curved at the dead point. On the upper and lower dead center positions of the crank pin 9, because the inclined plane of the curved long hole 10 of the slide plate 7 contacts the crank pin 9, the dead point problem of the crank pin 9 in the long hole 10 is eliminated, and the curved long hole 10 The direction of inclination determines the direction of rotation of the crank wheel 6 and keeps it in a fixed direction of rotation.

In order to automatically reset the piston rod 11 after being pressed, a vertical spring 17 is fixed at the lower end of the pressing plate 16 , and the other end of the spring 17 is fixed on the casing 4 .

In order to ensure the stability of the piston rod 11 when it is reset, multiple sets of springs 17 are provided, and the multiple sets of springs 17 are symmetrically arranged around the piston rod 11 .

When the utility model is used, the position of the paintbrush 15 on the ruler 14 is adjusted according to the size of the circle to be made, and the ruler 14 is fixed, the position of the center of the circle is positioned with the positioning pin 2, the suction cup 3 is adsorbed on the drawing plane, and the connection is pressed by hand The pressing plate 16 at the upper end of the piston rod 11 drives the piston rod 11 to move, and the upper end of the piston rod 11 runs through the box body 4. Under the constraint of the box body 4, the piston rod 11 moves up and down along the upper end cover of the box body 4. , the piston rod 11 drives the slide plate 7 to move up and down, the slide plate 7 drives the crank wheel 6 to move through the crank pin 9, the crank wheel 6 rotates in a circle through the rotating shaft 8, and the crank wheel 6 drives the second bevel gear 13 to rotate through the first bevel gear 12 , the second bevel gear 13 is connected with a horizontal ruler 14, and the ruler 14 is equipped with a brush 15 that can slide horizontally on the ruler 14. The second bevel gear 13 moves in a circular motion with the animation pen 15 through the ruler 14. When half of the drawn circle is completed , loosen the pressing plate 16, under the action of the spring 17, drive the piston rod 11 to move upwards, through the curved long hole 10 and the crank pin 9, drive the crank wheel 6 to continue to rotate along the original circular direction, and the crank wheel 6 drives the The first bevel gear 12 meshes with the second bevel gear 13 to drive the ruler 14 to continue to move along the direction of the original circle, to complete the drawing of the entire circle, and the compasses are reset to the initial state.

The utility model adopts a pressing type to draw a circle, avoiding the phenomenon that the center of the circle is not uniform due to inconvenient operation or trembling of hands during the process of drawing the circle, and prevents the drawn circle from being deformed to a certain extent.

Claims (5)

1. Push-type compasses, including a base (1), characterized in that the lower end of the base (1) is equipped with a vertical positioning pin (2) and a transparent suction cup (3), and the lower end of the suction cup (3) Lower than the needle point of the positioning needle (2), the base (1) is inserted with a vertical connecting shaft (5), and the upper end of the connecting shaft (5) is fixed with a box (4) whose lower end surface is parallel to the upper end surface of the base , forming a structure in which the box body (4) is fixedly supported on the base (1) via the connecting shaft (5), and the upper end of the box body (4) is movably pierced with a piston rod (11) whose upper end protrudes from the upper surface of the box body (4). , the lower end of the piston rod (11) is tightly connected with a slide plate (7), the slide plate (7) is provided with a horizontal long hole (10), and one side of the box body (4) is connected with a crank wheel (6) through the rotating shaft (8). ), a horizontal crank pin (9) is installed on the edge side of the crank wheel (6), and the crank pin (9) is inserted into the long hole (10) to form a structure in which the piston rod (11) moves up and down to control the rotation of the crank wheel (6), The first bevel gear (12) that rotates with the crank wheel (6) is fixed on the outer end of the rotating shaft (8) located on the box (4), and the connecting shaft (5) is rotatably connected with the first bevel gear (12). The second bevel gear (13), the outside of the second bevel gear (13) is equipped with a ruler (14), and the ruler (14) is equipped with a paintbrush (15) that can slide horizontally on the ruler (14). 2. The pressing compasses according to claim 1, characterized in that, the upper end of the piston rod (11) is connected with a pressing plate (16), and the outer diameter of the pressing plate (16) is larger than that of the piston rod (11) path. 3. The push-type compass according to claim 1, characterized in that, the long hole (10) is curved at the dead point. 4. The pressing compasses according to claim 2, characterized in that a vertical spring (17) is fixed on the lower end of the pressing plate (16), and the other end of the spring (17) is fixed on the box body (4) superior. 5. The push-type compass according to claim 4, characterized in that there are multiple sets of springs (17), and multiple sets of springs (17) are symmetrically arranged around the piston rod (11).