SU75797A1 - Tool for drawing curves from life - Google Patents

Description

The proposed device for drawing curves from nature differs from the existing devices of similar purpose in that it is equipped with a rotating drum for a bypass cable mounted on a rotating frame and kinematically connected with a rail moving from the drum carrying a recording pencil.

FIG. Figures 1 and 2 depict a device for drawing curves from nature in two projections; in fig. 3-plan view of the device; in fig. 4-pole with bypass roller.

The device consists of a planchette / vertically mounted on a horizontal platform 2. The carriage 4 moves along an arc 3 of the plate / divided by degrees, equipped with a counterweight 5, which provides it with an indifferent equilibrium state with respect to its hinge made of two ball bearings 6..

On the carriage 4, drum 7 is strengthened, which is wound with a string. When winding, the string is laid on the drum by the driver consisting of screw 8 and roller 9. With drum 7, gear rail 10 is connected through gears 10, 11, 12 and 13, having an eyelet 15 in which a pencil 16 is attached with a compression spring

17 and a latch 18. The paper tape, on which marks are made, is pulled onto the coils 19. A level level 20 is provided for the device to be properly installed in the horizontal plane.

The device is mounted on a tripod stand with an extruded table for height adjustment. In the horizontal plane, the device is installed at a level 20 with screws in the legs of the stand.

The drum 7 is provided with a spring that twists when winding the string from the drum. , while weakening the tension of the string, the latter is wound on the drum under the influence of the spring, so that the string does not sag. During laying of the string on the drum 7, the thread pitch of the screw 8 is equal to the step of winding the string on the drum. When the string is tensioned, the drum 7 begins to rotate and the rail 14 moves radially from the center of the swing to the periphery; when loosening and winding the string on the drum, the rail moves in the opposite direction. Thus, a pencil 16, reinforced in rail 14, will draw a curve on a paper tape wound on a reel 19.

455 X 75797 After shooting the nqjBoro section, the further installation is controlled by the initial angle (the angle between the horizontal and the keel point beam), as well as the instrument's initial distance from the keel line. Rotation is measured by a string with the help of a stopper 21. A string is contoured by a string with a pole 22, fitted with a roller 23 and a collar 24 for fastening the string at the end (Fig. 4). The subject of the invention is a device for drawing curves from nature, about tl and cha y and with the fact that it is equipped with a rotating drum for a bypass cable. mounted on a rotary frame, kinematically connected with a drum from the drum, carrying a recording pencil.

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