RU2343106C2 - Self-supporting lever - Google Patents

Abstract

FIELD: transport; mechanics.

SUBSTANCE: invention is used for lifting and canting of cargoes. Lever has smoothly matching curved hold-down arm and actuating arm of variable cross section enlarged towards connection line. Actuating arm of lever is radiussed, hold-down arm also has variable cross section enlarged towards arms connection line. Arms connection line runs from actuating arm end at distance of from one-third to one-fifth of lever length in dissection.

EFFECT: possibility to use variable arm length during turn of lever.

3 cl, 7 dwg

Description

The invention relates to the field of construction, rigging and installation work, and more particularly to hand tools for lifting and turning over loads, as well as for disassembling simple structures.

A device for hanging loads, such as rails, in the form of a lever pivotally mounted on a rack [1]. The small working shoulder of the lever is made curved for the convenience of picking up a specific load. The disadvantages of the device are complexity and special purpose.

Known two-arm lever of the 1st kind, mounted on a rolling support [2]. Its disadvantages are a constant ratio of shoulders and attachment to the support. This lever is taken as a prototype.

The technical result of the proposed lever is a variable point and bearing area, a variable length of the shoulders depending on the angle of rotation of the lever. This allows you to turn over hard-to-reach loads and effectively redistribute the pressure forces on the support and pressure on the lever.

This result is achieved by the fact that in the self-supporting lever for lifting and tilting goods, which has smoothly conjugated curvilinear pressure shoulder and the working shoulder of variable cross section increasing to the line of coupling, the working shoulder is bent in radius, the pressure shoulder has a variable section that increases to the line of shoulder linking, which located from the end of the working shoulder at a distance from one third to one fifth of the length of the lever in the sweep.

The cross-sectional profile can be made trapezoidal in shape.

The cross-sectional profile can be made in segmented form.

The invention is illustrated by drawings, in which: figure 1 depicts a lever; figure 2 is a top view of figure 1; figure 3 - scan lever; figure 4 and 5 - section aa in figure 2, options; 6 and 7 - the position of the lever at the time of moving the load and tipping, respectively.

The self-supporting lever 1 for lifting and tilting loads has a smoothly mating curved pressure arm 2 of length L and a working arm 3 of length l of variable cross section, increasing to the interface line 4 (FIGS. 1, 2). The working arm 3 is curved along the radius r, and the pressure arm 2 is curved along the radius R of lesser curvature and has a variable cross section, increasing towards the line of mating of the shoulders. The line connecting 4 shoulders is located from the free end of the working shoulder at a distance l ₀ from one third to one fifth of the length of the lever in the scan l ₀ + L ₀ (figure 3). The free end of the lever shoulder can be equipped with a contoured handle 5. The section profile with a height “a” and a width “b” can be trapezoidal 6 (FIG. 4) or segmented shape 7 (FIG. 5).

Self-supporting lever operates as follows. The free end of the working shoulder is brought under the load 8 weight G (Fig.6). Moreover, the distance from the fulcrum to the front end is l ₁ , and to the point of application of force on the pressure arm - L ₁ . The center of gravity (ts.t.) of the load is at a distance of C ₁ from the edge of the tilting. Next, a force F _{1 is} applied. After tilting the load, the fulcrum will shift to the line connecting the shoulders, and the latter will change their sizes to l ₂ and L _2, respectively (Fig.7). The center of gravity will shift closer to the edge at a distance of C ₂ . As a result of this, the pressing force F ₂ on the lever practically does not increase in comparison with F ₁ .

Information sources

1. A.S. USSR No. 181680, IPC B16F 15/00. Device for hanging rails. 1966

2. Artobolevsky N.I. Mechanisms in modern technology. T.1. - M .: Nauka, 1970 - 680 p. Page 97. Mechanism 121. Two shoulders lever. Prototype.

Claims (3)

1. Self-supporting lever for lifting and turning over loads, having a smoothly mating curved pressure shoulder and a working shoulder of variable cross section increasing to the mating line, characterized in that the working shoulder is bent in radius, the pressure shoulder has a variable cross section increasing to the shoulder mating line, which is located from the end of the working shoulder at a distance of one third to one fifth of the length of the lever in the sweep. 2. The lever according to claim 1, characterized in that the section profile is trapezoidal in shape. 3. The lever according to claim 1, characterized in that the sectional profile is made in segmented form.

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