SU42695A1 - An apparatus for building polygons, for example, when drawing nuts and gears - Google Patents

Description

The proposed device is intended for building polygons, for example, when drawing nuts and gears, and refers to devices already known of this kind, made in the form of compasses with the number of legs corresponding to the number of sides of the polygon. In the proposed device, a washer is passed through the legs of the device to a thread, a tube mounted on a needle-shaped rod, fitted with a disk mounted on it, which serves to adjust the distance between the ends of the legs of the device.

In the drawing of FIG. 1 shows the proposed device in front; in fig. 2-5 details of the device.

The proposed device consists of a washer 3, which acts as the body of the device, a tube 2, provided with a thread at the upper end and a grooved head, and at the lower cone-shaped hole. In the middle part, a disk 6 is put on the tube 2, which can freely rotate around the tube in a special bearing. The disk diameter is larger than the diameter of the washer and is associated with the size of the marked circles.

In the center of the washer 3 there is a hole with a thread corresponding to the thread of the tube 2 through which the tube can be screwed in and out to the required depth. Along the outer circumference of the washer 3, there are sockets 4 at an equal and exact distance between each other (six are shown in the drawing) with removable studs. In these sockets, a hingedly corresponding number of legs 5, terminating at the opposite end of the hinge, are fastened with tips like edges of a drawing compass. In the upper part of the legs have hollows //. The disk 6 on the outer surface has sockets corresponding to the sockets of the Saiba 3 in location and the legs are 5 in width. In tube 2, a needle-shaped rod / with a grooved head at the top end and a tip at the bottom is missing. The rod has free movement along tube 2, up and down like a pin in a drawing caliper. On the bottoms of the legs 5, a spiral spring ring JO is superimposed on the outer side, with which the legs are pressed toward the center and held in the slots of the disk 6. When the tube 2 in the washer 3 is moved, the disk 6 slides along the legs 5 and into the corrugated head Because of their conical arrangement in the device, their sharp ends are moved apart or shifted.

When drawing the nuts, the device takes the right hand like a caliper, ..

and the rod 7 is placed with the tip in the center of the circle into which the nut must fit. By turning the tube 2 to the right or left, the legs 5 are mounted on the circumference line. After that, with a slight pressure on the device on the circle at an equal distance, the corresponding number of points are noted.

When drawing gears, points are plotted on a circle in the same order as when drawing nuts. After marking the points, one distance is divided by compass by the corresponding number of additional points. After that, the device moves around the center for each division and, by repeated presses, outlines a corresponding number of additional points along the entire circumference.

The subject matter of the invention.

Claims (2)

1. A device for building polygons, for example when drawing nuts and gears, made in the form of compasses with the number of legs corresponding to the number of sides of the polygon, characterized in that through the supporting legs 5 of the device washer 3 is passed through a thread mounted on a needle-shaped rod / tube 2 provided a disc 6 mounted on it, which serves to adjust the distance between the ends of the legs 5. 2. The form of the device according to claim 1, characterized in that for pressing the legs 5 of the device to the disk 6, the legs are fastened with a spring ring 10. Siig .with ri-fig5. 1 () t Г Ц Jj one  . eri /