Classifying – separating – and assorting solids – Sifting – Elements
Patent
1981-03-02
1983-10-11
Hill, Ralph J.
Classifying, separating, and assorting solids
Sifting
Elements
209405, B07B 149
Patent
active
044090994
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a sieve deck for sifting machines, sifting boxes or the like.
A sieve deck of this kind comprises a support structure and sieve elements releasably disposed thereupon and provided with a multiplicity of sieve openings. These sieve elements extend to form a continuous separation face and have the basic shape of a polygon, the sieve elements being secured on the support structure at least in the vicinity of some of their corners.
PRIOR ART
A known sieve deck of the type discussed above is described in U.S. Pat. No. 4,141,821. In this apparatus, the substantially square sieve elements are not only secured to the support structure at each of their four corners, but they also rest with their long sides facing one another on parallel struts which make up the support structure. The sieve elements, with their rims, project over these struts of the support structure and are accordingly supported over the entire length of their long sides. The known realization is associated with the disadvantage that the sieve elements cannot have any sieve openings in the vicinity of their longitudinal rims resting on the support structure, which limits the actual open surface area available for sifting. Furthermore, the struts of the support structure must be adapted both in terms of the direction in which they extend and in their dimensions to the sides of the sieve elements which will rest upon them. The width of the support struts of the support structure must therefore not be below a certain given width, so that in the known embodiment the expense for materials used to make up the support structure cannot be reduced any further.
THE INVENTION
With a sieve deck of the type described above as a point of departure, the invention has the fundamental object of attaining a larger actually effective open surface area for sifting.
This object is attained, in a sieve deck of the general type described, as a result of the provision that the sieve elements are supported at a distance from the support structure only in the vicinity of the corners thereof which are secured, and that they are connected with the support structure itself via spacer elements.
The particular advantage of a sieve deck according to the invention is that the support of the sieve elements solely in the vicinity of their corners accordingly enables an enlargement of the actually effective open surface area for sifting, because the sieve openings are capable of extending as far as the rim of the individual sieve elements, or even beyond that. Because the support structure is shifted downward from the underside of the sieve elements and disposed at a distance therefrom, the passage through the sieve of the material to be sifted is not hindered even in the vicinity of those sieve openings which are located (viewed in the direction in which the material to be sifted will pass through the sieve) above the individual struts of the support structure. In order to prevent the effect of abrasion on the struts as a result of the sifted material, the struts of the support structure can be provided on their upper surface with a streamlined shape and/or a wear-prevention coating.
According to a further embodiment of a sieve deck according to the invention, the spacer elements may either be rigidly attached to the sieve elements or embodied as separate components which can be inserted between the sieve elements and the support structure. It is also possible to dispose the spacer elements rigidly on the support structure. In that case, the spacer elements may advantageously be embodied by sawhorse-type supports on the support structure.
The streamlined shape of the upper surface of the support structure struts can be provided by embodying the upper surface of these struts as either oblique or convexly curved surfaces. In particular, the upper surfaces of the support structure struts may have the form of a peaked roof.
A further advantageous embodiment of a sieve deck according to the invention is represented by the supporting of adja
REFERENCES:
patent: 2883051 (1959-04-01), Maeder
patent: 3905897 (1975-09-01), Jacobson
patent: 4062769 (1977-12-01), Simonson
patent: 4141821 (1979-02-01), Wolff
Hill Ralph J.
Steinhaus GmbH
LandOfFree
Sieve deck for sifting machines does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Sieve deck for sifting machines, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sieve deck for sifting machines will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1274151