SU31667A1 - Goniometer - Google Patents

Description

An applied goniometer is a conventional protractor with an arrow fixed in its center, one of its ends freely sliding along the scale and lying on top of the base of the protractor, which means it does not provide accurate measurements when working with small objects.

In the proposed goniometer, the arrow is hingedly connected to a system of rulers, of which two protruding beyond the protractor are designed to align with the edges of the measured outer angle. The amplitude of the action of the goniometer is 160 (from 10 to 170 °). The accuracy of determining the values of the protruding angles can be increased to D degrees.

In FIG. 1 is a top view of a goniometer; and FIG. 2nd perspective view.

The proposed (for external angles) goniometer slug is a set of parts of two systems — the degree scale of the metal protractor and the measuring arrows of the movable (19 joint) diamond. Metal arc / protractor at the ends of the spa with a base 2 circle diameter. Scale numbers increase from right to left from 0 to 180 °. The thickness of the entire instrument, namely the basis of the protractor and the system of the measuring rhombus sliding along it, is 4 mm.

341).

The base 2 of the protractor is composed of two parts: the middle (right) 2 mm thick and the left, the edge, the component of two completely identical plates, the upper and the lower, with a thickness of each plate of 1 mm. The connection of the left and right parts of the base (by adhesion) occurs at the setting of their beveled ends at each other. On base 2, there are four holes for the bonding axes of the rulers: in the center of the base for arrow 3 and on the left side of it for rulers 9 and 7, and on the right for ruler 4. All holes are geometrically located exactly along the diameter line of the semicircle of the protractor.

The hinge ruler system is composed of one fixed part, the base 2 of the protractor and ten under the movable parts, the main arrow 3 and the rulers - #, 5, 6, 7, 8, 9, 10, 11, 72, 13. Axial bonding points of all these articulated lines hinged into a movable rhombus are spaced apart from each other at a precisely defined distance. Having a free swing to the right and left, the entire rhombus can be folded in two directions. The arrow 5 is somewhat more massive than the rest of the rulers and is gradually extended from the joint to the ruler 10. It consists of two identical plates covering the protractor at the top and bottom, and is equipped with six holes for fastening with transverse lines.