SU61329A1 - The device for building grids - Google Patents

Description

Exact construction of coordinate grids on paper when performing topographic, etc. works requires considerable time and is a rather laborious operation.

The proposed tool for imaging coordinate grids has the distinctive feature that it is composed of a ruler connected by hinged ends with two rulers of the same length. The latter are interconnected by a removable hinge. Such a structure makes it possible to form from all three rulers isosceles right-angled triangles, which can be located both on one and on the other side of the first ruler, which is their drop-off.

Pa drawing shows schematically the described device.

The device consists of three lines AB, BC and AC, each about 1 mm thick, connected by hinges at points A, B and C and making up an isosceles right triangle ABC. In this case, the legs of the triangle AB and BC are sides of a square with a side length of 500 mm, and the hypotenuse AC serves as a diagonal of the same square. The AB and BC rulers are provided with apertures of about 0.3 mm in diameter at points a, b, h, i dividing the moldings into rabbi parts of 100 mm each.

The Liieika AC diagonal of the square is also divided into equal parts by the openings k, 1, m, n and provided with two end openings at points O and P.

Hinges A, B and C are provided with through holes with a diameter of 0.3 mm. Holes at points a, c,. . . t, n are intended for sticking paper onto the paper using a steel needle.

When using the device proceed as follows.

An AC speaker is placed on a sheet of paper and secured firmly on a board at points o and p. Rulers AB and BC occupy at the same time

No. 61329-2 -

the positions indicated in the drawing in solid lines. Through the holes at points a, a,. . . : in, f,. . . , i, With punched paper with a needle.

At the end of this operation, release the hinge B and the rulers AB and BC shift the other side of the non-idle speaker so that the hinge B hits point B. Dots a b, are punched through holes on a sheet of paper. . . h, i. The holes at the points k, 1, m, n of the AC ruler serve for drawing control points on a sheet of paper through which the intersecting must pass, and the future grid line.

When dots are plotted on paper, the AB and BC lines are superimposed on the AC line. entering the ends under the heads of both buttons S of the last and, in such a straightforward form, the device serves as a ruler for constructing the grid itself by passing straight lines af, bq. . . af, bq, etc.

Line C can be provided with a scale.

In addition to building an accurate coordinate grid, the specified device can serve as a ruler, a triangle, and a scale.

Subject invention

1. An instrument for constructing grids, tl and h and y with the use of a ruler, carrying at the ends two identical lengths of a ruler, connected to it by a hinge, and between them by a removable hinge, in order to form from all three rulers isosceles right triangles but both sides of the first ruler.

2. The form of the device according to and. 1, characterized in that all three rulers are provided with appropriately arranged puncture holes of the grid points.