SU896415A1 - Level beam - Google Patents

Description

(5) LEVEL REIKA

one

This invention relates to geodetic instrumentation, in particular; to auxiliary devices for measuring elevations.

A leveling rod is known, comprising a housing with a ruler with a scale of 1 reinforced therein.

The disadvantage of this rail is the presence of temperature deformations, as well as the impossibility of executing the folding or sliding construction without loss of accuracy.

Closest to the invention is a leveling rail, comprising a housing with a main and auxiliary rulers mounted on it with scales made of materials with different expansion coefficients, and a compensation mechanism consisting of straight and figured levers connected to the measuring element 2.

The disadvantage of the known rail is the impossibility of making it

In the form of a folding or sliding design without loss of measurement accuracy, which makes it difficult to carry and transport in natural conditions.

The purpose of the invention is to improve the accuracy of taking into account the temperature deformations of the leveling scales and user-friendliness (coagulation) during transportation and transport.

to

The goal is achieved by the fact that the two supports are interconnected by three strings made of materials with different linear expansion coefficients, and the bands with scales made of flexible material are connected with the possibility of opposite movement during thermal expansion, when one of the tapes is rigidly fastened with the bottom support and through the tension device - with a horizontal lever -. and the other is rigidly fastened to the horizontal vt lever through the tensioning device — to the bottom support. FIG. 1 shows the rake, general view; in fig. 2 is a section LL in FIG. 1. The leveling rail contains two supports 1, connected by three strings 2, having different linear expansion coefficients, a compensation mechanism consisting of two inclined levers 3 fixing the position of the horizontal lever t, the relative position of which relative to the supports is constant temperatures under the following conditions: 1–1 AL, 1 aha–, 7 da | aa where cL, clq, cL are the coefficients of linear expansion of the medium and side strings between the strings; the distance from the side strings to the point where the horizontal lever is attached. In this case, cL d. (And when cL in the right side of the formula is reversed. The horizontal arm k and the lower support 1 are attached to the tape 5 with the scales, one in the upper part, and the other in the bottom are connected to the tension The spring device 6, which both makes it possible for the belts to move oppositely during thermal expansion, “The zeros of both scales are located at one of the supports.” In the working position, the rigidity of the structure is ensured by a collapsible rack-lock 7 containing an expansion screw sleeve 8. Install the stand-clamp 7 and rotate the clutch 8 until the clips on the tensioning devices show the same fit. 5. After that, the rail is ready for operation. When the tensioner changes, during the measurements the length of the stand If the temperature conditions change during the measurement, the strokes of one scale move down and the other move up, since one tape 5 is fixed to the support and the other to the horizontal lever. In this case, a readout free from temperature deformations is obtained using the formula (7 -F P 1 tt, (1 - T), where, n counts on the scales; L is the length of the scales. When carrying or transporting, the stand-clamp is removed and disassembled by screwing up the coupling, the rail rolls up into a roll. The proposed leveling rail is advisable to use in buildings and mines, where surveyors: it is necessary to perform various measurements during one working day in a short period of time (leveling, measuring angles, lines, special works. Since in these cases a large number of differently designed devices must be carried and transported over considerable distances, the use of this leveling rod will increase productivity and create an ability to perform leveling under hard-to-reach conditions. Aormula of the invention of the leveling rod containing two pillars two tapes with scales and a compensation mechanism consisting of two inclined levers connected by a horizontal lever on the side distance from the bottom support, which is different from the fact that, in order to increase the accuracy of taking into account the temperature deformations of the leveling scales and ease of use when carrying or transporting, the supports are interconnected by three strings made of materials with different linear expansion coefficients, and scales, made of flexible material, are connected with the possibility of opposite movement during thermal expansion, one of the ribbons being rigidly fastened to the lower support and, through a tensioning device, horizontally Talnoe lever and the other rigidly connected to the horizontal lever and through the tensioning device - with the support. Sources of information taken into account in the examination

Claims (1)

Claim Leveling rod comprising two legs connected counter-clamp, two belts with scales and a compensation mechanism consisting of ³⁵ two angled levers connected by a horizontal lever located on postryannom distance from the bottom support is cast in that, in order to increase the accuracy of Uch ⁴⁰ that temperaturnyh.deformatsy leveling scales and convenience when carrying or transporting, the supports are interconnected by three strings made of materials with ⁴⁵ different coefficients of linear expansion, and the belt with scales made of flexible material are connected with the possibility of opposite movement during thermal expansion 50, moreover, one of the tapes is rigidly fastened to the lower support and through the tensioner to the horizontal lever, and the other is rigidly fastened to the horizontal lever 55 and through the tensioner to the lower support.