US4409099A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sieve deck for sifting machines
Assignee: Steinhaus GmbH
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Filing: 1980-07-02
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Granted: 1983-10-11
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Expires: 2000-07-02
Abstract
Abstract Sifters which may comprise a plurality of elastic plates with embedded reinforcements are arranged to be releasably attached at the corners to spacer elements supported on a main frame. Adjoining corners of adjacent sieve plates are supported on a single spacer element. Each corner has a depending stub which is received in an opening in the spacer element. Each sieve element may have a peripheral sealing lip. The cross section of the frame struts is shaped to allow sifted material to fall off.
Inventors
- 👤 Kurt Wolff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:30
CPC Classifications
B; B07; B07B; B07B1/00; B07B1/46; B07B1/4609; B07B1/4645
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
111 words
A sieve deck for sifting machines, sifting boxes or the like, comprising a support structure and sieve elements releasably disposed thereon and provided with a multiplicity of sieve openings which extend to form a continuous separation face and have the fundamental shape of a polygon, wherein the sieve elements are secured on the support structure at least in the vicinity of their secured corners and are connected with this support structure via spacer elements, whereby the adjoining corners of adjacent sieve elements are supported on one single spacer element, which has a single reception opening on its upper side for centrally securing all the adjacent corners of the respective sieve elements.
Claim 2
Dependent Claim
111 words
A sieve deck for sifting machines, sifting boxes or the like, comprising a support structure and sieve elements releasably disposed thereon and provided with a multiplicity of sieve openings which extend to form a continuous separation face and have the fundamental shape of a polygon, wherein the sieve elements are secured on the support structure at least in the vicinity of their secured corners and are connected with this support structure via spacer elements, whereby the adjoining corners of adjacent sieve elements are supported on one single spacer element, which has a single reception opening on its upper side for centrally securing all the adjacent corners of the respective sieve elements.
Claim 3
Dependent Claim
24 words
The apparatus set forth in claim 1 wherein the support structure comprises elongated members having a sieve confronting surface inclined away from the sieve.
Claim 4
Dependent Claim
15 words
The apparatus of claim 1 wherein each sieve element has an a reinforced peripheral boundary.
Claim 5
Dependent Claim
30 words
The apparatus set forth in claim 1 wherein each sieve element has a sealing lip around the peripheral boundary thereof for abutment with the sealing lips of other sieve elements.
Claim 6
Dependent Claim
33 words
The apparatus set forth in claim 1 wherein the peripheral boundaries of the sieve elements respectively include openings therein which match openings in abutting elements to form a continuous plane of sieve openings.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-10 | 1987-04-11 | 1987-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-10 | 1991-04-11 | 1991-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-10 | 1995-04-11 | 1995-10-11 | $7700.00 | Window Closed / Lapsed |