US4120784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screening apparatus
Assignee: N Greening Ltd
•
Filing: 1977-02-28
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Granted: 1978-10-17
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Expires: 1997-02-28
Abstract
Abstract Screening apparatus, particularly vibratory screening apparatus, includes a screening surface formed of one or more plates of flexible non-metallic material having apertures therethrough, with a plurality of attachment bars projecting from the underface of the or each plate at intervals along the length thereof. Each attachment bar extends across the width of the plate, and the plate or plates are supported by a support structure which includes a plurality of spaced support bars provided at intervals along their length corresponding to the intervals of the attachment bars with apertures of a shape to receive the attachment bars of the plate or plates.
Inventors
- 👤 Anthony George Hassall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:15
CPC Classifications
B; B07; B07B; B07B1/00; B07B1/46; B07B1/4609; B07B1/4645; B07B1/469
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
108 words
Screening apparatus including a screening surface formed of one or more plates of flexible nonmetallic material having apertures therethrough, a plurality of attachment bars projecting from the underface of the or each plate at intervals along the length thereof, each attachment bar extending in the direction of the width of the plate, and a support structure for supporting said plate or plates, said support structure including a plurality of spaced support bars running transversely of the attachment bars and provided at intervals along their length corresponding to the intervals of the attachment bars with slots of a shape to receive the attachment bars of the plate or plates.
Claim 2
Dependent Claim
108 words
Screening apparatus including a screening surface formed of one or more plates of flexible nonmetallic material having apertures therethrough, a plurality of attachment bars projecting from the underface of the or each plate at intervals along the length thereof, each attachment bar extending in the direction of the width of the plate, and a support structure for supporting said plate or plates, said support structure including a plurality of spaced support bars running transversely of the attachment bars and provided at intervals along their length corresponding to the intervals of the attachment bars with slots of a shape to receive the attachment bars of the plate or plates.
Claim 3
Dependent Claim
35 words
Screening apparatus according to claim 1 wherein the cross-sectional shape of the attachment bars and the shape of the slots in the support bars are such that the slots receive and retain the attachment bars.
Claim 4
Dependent Claim
30 words
Screening apparatus according to claim 1 wherein the support bars are arranged to have different heights across the width of the screen to produce a cambering of the screening surface.
Claim 5
Dependent Claim
36 words
Screening apparatus according to claim 1, wherein the screening surface is formed of an array of plate-like modules having apertures therethrough and edges shaped to fit together with the edges of adjacent modules in the array.
Claim 6
Dependent Claim
44 words
Screening apparatus according to claim 4 wherein the module edges have such a shape as to provide cavities between adjacent modules and the modules of the array are joined into a unitary whole by means of a synthetic plastics material moulded into such cavities.
Claim 7
Dependent Claim
37 words
Screening apparatus according to claim 1 wherein the screening surface has reinforcement wires or rods moulded into the material thereof at intervals across the width thereof, said reinforcement wires or rods extending parallel to said support bars.
Claim 8
Dependent Claim
70 words
Screening apparatus according to claim 6, wherein the screening surface further includes tensioning wires or rods moulded into the material thereof at intervals along the length thereof, said tensioning wires or rods extending parallel to said attachment bars and above the level of such bars at least at opposite ends of said tensioning wires or rods and said reinforcement wires or rods serve to locate said tensioning wires or rods.
Claim 9
Dependent Claim
39 words
Screening apparatus according to claim 1 wherein the screening surface includes tensioning wires or rods extending parallel to said attachment bars and above the level of such bars at least at opposite ends of said tensioning wires or rods.
Claim 10
Dependent Claim
36 words
Screening apparatus according to claim 1 including thin-walled tubes moulded into the material of the screening surface at intervals along the length thereof and extending parallel to said attachment bars to receive tensioning wires or rods.
Claim 11
Dependent Claim
14 words
Screening apparatus according to claim 9 wherein said tubes extend through said attachment bars.
Claim 12
Dependent Claim
23 words
Screening apparatus as claimed in claim 1, wherein at least some of the attachment bars extend completely across the width of the plate.
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) | 1981-10-16 | 1982-04-17 | 1982-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-16 | 1986-04-17 | 1986-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-16 | 1990-04-17 | 1990-10-17 | $7700.00 | Window Closed / Lapsed |