DE199496C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

* 199496-CLASS 1 a, GROUP

CHARLES MOREL in DOMENE (Isere, France. Circular pendulum razor with arched sieve.

Addendum to patent 198575 of April 28, 1906.

Patented in the German Empire on April 28, 1906. Longest duration: April 27, 1921.

In the 198575 patent is a screening device for granular and powdery material to be screened. The present invention is a further embodiment of that shown in FIG Device described in patent 198575; in place of the flat. Siebes becomes a those with a convex surface are used. This is already known for seven; new is but the execution that the curvature of the screen from the center to the circumference increases towards; the material to be screened is placed in the middle and moves according to the circumference the sieve closed. A curvature of the screen has proven to be particularly useful proved to be approximately parabolic in shape.

In Figs. 1 to 4 of the accompanying drawings The embodiment described is particularly suitable for sieving very fine material.

Fig. 1 is an overall view, partially in section, Fig. 2 is a plan view; Fig. 3 is a detail view of the upper portion of the apparatus on a larger scale, Fig. 4, a dare right section on the line 4-4 of FIG. 3. The vertical shaft C resting in a thrust bearing B and supports at its upper end the screen D . with regard to its use of very fine material to be screened, it is especially designed; it is curved in such a way that the curve extends from the center to the circumference

. increasing progressively. . The sieve is connected to the shaft by braces <ί '; At its upper end, the shaft C carries a roller s, which is expediently composed of leather discs. This role runs in a solid ring T, which is formed in a wave shape inside to generate impacts. It is driven by a sliding block R and a direct belt drive or according to the information in the main patent. A cap 11 protects the drive against the dust of the material to be screened. The drive device gives the shaft C and thus the sieve a movement in which they one. Describes cone.

The working process is as follows: The material to be screened passes through an opening L to the funnel / and from there to a funnel P, which is firmly connected to the screen D and the shaft C; the funnel P is provided with holes ρ from which the material to be sieved falls onto the sieve D , where it is spread evenly as a result of the movement of the sieve. The material that has fallen through the sieve reaches the outlet O, while the coarse material emerges at the circumference of the sieve through the annular channel formed by the walls A, A ^{1 at O 1.} ■

The device is provided with a cover V which has a viewing hole ν through which the sieve can be observed and cleaned. The viewing hole is closed by a cover. In order to support the sieving work, the sieve surface can be slightly

Give shocks, for which purpose it is useful to use some small rubber balls X , which are suspended from the cover V by means of threads. The shape given to the sieve is not indifferent; like the arrangement described so far, it serves to achieve a particularly favorable result. The reasons for choosing the shape of the sieve shown in the drawing are as follows:

ίο As a result of the impacts that occur in the ring T , the sieve receives a slight circular movement, as a result of which the amount of displacement of the material to be sieved in the horizontal direction is constant for all points of the sieve; however, this does not apply to the magnitude of the displacement in the vertical direction, which increases from the center to the circumference; the product spread out on the sieve makes jumps as a result of the movement of the sieve, which can be compared with those of the product on a grain swing; As a result of the cracks, the sieve material tends to return from the circumference of the sieve to the center point; However, in the present arrangement, due to the inclination of the sieve, it is nevertheless guided to the circumference, namely as a result of the difference in the movement of the goods in the vertical direction at points which are at different distances from the center of the sieve. The sieve would now be ζ. Β. simply conical, so it would be difficult to find a slope at which the sieve material spreads out evenly and can be sieved, both on the inner and on the outer side of the sieve; would z. For example, if the inclination near the center were favorable, it would be too weak on the circumference, and if it were favorable on the circumference it would be too great towards the center. In the first case, the material to be screened would be held up and jam sites would form, the consequence of which would be a blockage of the screen, while in the second case the material would reach the circumference of the screen too quickly. ■

But if you use a curved sieve with an increasing incline from the center according to the extent, so the effort of the screenings, as a result of the jumps to the Center, due to the greater inclination to the one at the outer end of the sieve balanced to located places, resulting in an even distribution and a regular sieving results.

This curved shape of the sieve is a matter of course, not tied to a precisely defined geometric line; expediently one will choose an approximately parabolic shape. In general, the screen surface must be designed so that the slope from the center increases in size, thereby achieving the advantages mentioned above.

Claims (2)

Patent Claims: 1. Embodiment of the orbiting pendulum rattle according to patent 198575 with an arched Sieves, characterized in that the inclination of the sieve surface increases from the apex to the extent. 2. Embodiment of the device according to claim 1, characterized in that that the curvature of the screen has an approximately parabolic shape. 1 sheet of drawings.