US4636304A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drum screening machine
Assignee: Hein Lehmann AG
•
Filing: 1985-03-22
•
Granted: 1987-01-13
•
Expires: 2005-03-22
Abstract
Abstract The invention relates to a screening machine with a screening drum which rotates about its axis and has a screen made of elastic material. The characterizing feature of the invention is that the screening drum has at least one screening zone which has the shape of a cylinder or truncated cone and the length of which, in order to alternately stretch and relax the screen lining, can be changed in a vibrating manner in the axial or conveying direction.
Inventors
- 👤 Kurt Hoppe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:59
CPC Classifications
B; B07; B07B; B07B1/00; B07B1/18; B07B1/22; B07B1/26; B01; B01D; B01D33/00; B01D33/06; B01D33/11; B01D33/80; B01D33/801; B07B1/46; B07B1/48; B07B1/485
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
94 words
A screening machine comprising: a screening drum defining an axis comprising first and second longitudinal support members; means for axially elastically connecting said first and second longitudinal support members; an elongated annular screen made of elastic material inside of said drum; means for circumferentially connecting said screen to said first support member; means for circumferentially connecting said screen to said second support member; means for vibrating said second support member in an axial direction; means connected to and not permitting axial motion of said first support member, for rotation said drum and screen therein.
Claim 2
Dependent Claim
94 words
A screening machine comprising: a screening drum defining an axis comprising first and second longitudinal support members; means for axially elastically connecting said first and second longitudinal support members; an elongated annular screen made of elastic material inside of said drum; means for circumferentially connecting said screen to said first support member; means for circumferentially connecting said screen to said second support member; means for vibrating said second support member in an axial direction; means connected to and not permitting axial motion of said first support member, for rotation said drum and screen therein.
Claim 3
Dependent Claim
43 words
A screening machine according to claim 1 wherein said means for circumferentially connecting said screen to said first support member comprises a first coaxial ring and wherein said means for connecting said screen to said second support member comprises a second coaxial ring.
Claim 4
Dependent Claim
28 words
A screening machine according to claim 1 wherein said means to vibrate said second support member includes means to vibrate said second support member in a linear manner.
Claim 5
Dependent Claim
42 words
A screening machine according to claim 1 wherein said means for rotating said drum and screen comprises two running rings, one ring connected to each of said first longitudinal support member ends, and support rollers for supporting and driving said running rings.
Claim 6
Dependent Claim
28 words
A screening machine according to claim 1 wherein said means for vibrating said second support member comprises any one of cams, out-of-balance drives, eccentric drives or electromagnetic means.
Claim 7
Dependent Claim
33 words
A screening machine according to claim 1 wherein said first longitudinal support means are formed by a first drum cage and said second longitudinal support means is formed by a second drum cage.
References Cited (Backward Citations)
US2700470A
Cited
US3633745A
Cited
US3591001A
Cited
US4188288A
Cited
US3971715A
Cited
US4269703A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-01-12 | 1990-07-14 | 1991-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-12 | 1994-07-14 | 1995-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-12 | 1998-07-14 | 1999-01-13 | $7700.00 | Window Closed / Lapsed |