Patent US4420391A successfully refreshed from Google Patents.
US4420391A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screen tensioning arrangement
Assignee: SWACO GEOLOGRAPH Co
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Filing: 1981-10-13
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Granted: 1983-12-13
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Expires: 2001-10-13
Abstract
Abstract A vibrating screen used for the fine screening of solids from a slurry containing solids includes a base, a screen box having feed end and discharge end with said screen box being resiliently supported on the base, and a drive for vibrating said screen in a generally longitudinal direction. The screen includes at least two overlying layers of relatively fine mesh screen cloth. A tensioning device is connected to one end of the screen cloth for tensioning the screen cloth in a direction parallel to the direction of motion of the screen cloth.
Inventors
- 👤 Martin J. Sharki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:39
CPC Classifications
B; B07; B07B; B07B1/00; B07B1/46; B07B1/48; B07B1/49; B01; B01D; B01D35/00; B01D35/20; B01D35/28
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
151 words
In a vibrating screen of the type including a base, a screen box resiliently supported on the base and having a feed end and a discharge end longitudinally spaced from the feed end, screen means removably secured to said screen box and extending longitudinally, drive means including a rotating eccentric weight vibrator attached to said screen box for vibrating said screen means in a generally longitudinal direction, said vibrating screen means been used for fine screening of solids from a slurry containing solids, the improvement which comprises: said screen means including at least two overlying layers of relatively fine mesh screen cloth; and tension means connected to the ends of said overlying layers of screen cloth for tensioning said overlying layers of screen cloth in a longitudinal direction parallel to the direction of motion of said screen whereby relative longitudinal motion between said overlying layers of screen cloth is substantially eliminated.
Claim 2
Dependent Claim
151 words
In a vibrating screen of the type including a base, a screen box resiliently supported on the base and having a feed end and a discharge end longitudinally spaced from the feed end, screen means removably secured to said screen box and extending longitudinally, drive means including a rotating eccentric weight vibrator attached to said screen box for vibrating said screen means in a generally longitudinal direction, said vibrating screen means been used for fine screening of solids from a slurry containing solids, the improvement which comprises: said screen means including at least two overlying layers of relatively fine mesh screen cloth; and tension means connected to the ends of said overlying layers of screen cloth for tensioning said overlying layers of screen cloth in a longitudinal direction parallel to the direction of motion of said screen whereby relative longitudinal motion between said overlying layers of screen cloth is substantially eliminated.
Claim 3
Dependent Claim
32 words
The invention of claim 1 wherein said tension means includes a movable tensioning member connected to one end of said overlying layers of screen cloth for selectively tensioning and relaxing said cloth.
Claim 4
Dependent Claim
39 words
The invention in accordance with claim 2 wherein said tension means further includes force generating means connected to said movable tensioning member for urging said tensioning member towards a first position for tensioning said overlying layers of screen cloth.
Claim 5
Dependent Claim
34 words
The invention in accordance with claims 1 or 3 further including longitudinally spaced curved support means extending transversely beneath the surface of said screen for defining a longitudinally bowed support surface for said screen.
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) | 1986-12-12 | 1987-06-13 | 1987-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-12 | 1991-06-13 | 1991-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-12 | 1995-06-13 | 1995-12-13 | $7700.00 | Window Closed / Lapsed |