US3655045A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for conveying and separating materials
Assignee: Ajax Flexible Coupling Co Inc
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Filing: 1969-10-30
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Granted: 1972-04-11
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Expires: 1989-10-30
Abstract
Abstract A screen is removably supported above the bottom of a reciprocable conveyor on longitudinally extending supports. Means for stretching the screen includes a plurality of air bags connected to the longitudinal edges of the screen. When the air bags are inflated the screen is stretched transversely and also held against portions of the support means. The air bags may be periodically deflated and again inflated while the conveyer is operated to allow the screen to loosen and impact against the support dislodging material lodged in the interstices of the screen to eliminate blinding.
Inventors
- 👤 George F Mcallister Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:56
CPC Classifications
B; B07; B07B; B07B1/00; B07B1/46; B07B1/50
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
50 words
An apparatus for screening material comprising a vibratory support, means for supporting a screen on the support, means for tensioning the screen and means for periodically operating said tensioning means during the screening of said material to periodically loosen and tension said screen whereby blinding of said screen is eliminated.
Claim 2
Independent Claim
50 words
An apparatus for screening material comprising a vibratory support, means for supporting a screen on the support, means for tensioning the screen and means for periodically operating said tensioning means during the screening of said material to periodically loosen and tension said screen whereby blinding of said screen is eliminated.
Claim 3
Dependent Claim
53 words
An apparatus as described in claim 1 wherein said means for tensioning the screen on the support means comprises a member movable relative to the screen and the support means, and means connected thereto for moving said movable member comprising a plurality of inflatable air bags and means to inflate the air bags.
Claim 4
Dependent Claim
39 words
An apparatus as described In claim 2 wherein said movable member is movable transversely of the support and said air bags move said member in one direction and resilient means is provided for moving it in the other direction.
Claim 5
Dependent Claim
20 words
An apparatus as described in claim 3 wherein said movable member is connected to the side of the vibratory support.
Claim 6
Dependent Claim
41 words
An apparatus as described in claim 4 wherein said movable member is provided with a screen engaging portion movably connected thereto and said screen is provided with a portion for interlocking engagement with said screen engaging portion of the movable member.
Claim 7
Dependent Claim
44 words
An apparatus as described in claim 5, wherein the portion of the screen for engagement with the screen engaging portion of the moveable member comprises a reinforcement having a portion extending under said screen engaging portion and another extending over said screen engaging portion.
Claim 8
Dependent Claim
55 words
An apparatus as described in claim 1 wherein said vibratory support includes a pair of spaced longitudinally extending side walls and the support means includes inwardly and longitudinally extending planar portions for supporting the longitudinal edges of the screen and at least one longitudinally extending support member disposed under the screen spaced from the edges.
Claim 9
Dependent Claim
20 words
An apparatus as described in claim 7 wherein longitudinally extending hook-shaped reinforcements are provided on the edges of the screen.
Claim 10
Dependent Claim
56 words
An apparatus as described in claim 8 wherein said hook-shaped reinforcements each includes a pair of spaced parallel walls with the edges of the screen disposed between the walls and said walls being bent to provide a first support engaging portion and a second portion extending at an oblique angle toward the mid-portion of the screen.
Claim 11
Dependent Claim
26 words
An apparatus as described in claim 8 wherein said movable member includes a longitudinally extending portion having a hook engaging portion disposed in the hook-shaped reinforcement.
Claim 12
Dependent Claim
43 words
An apparatus as described in claim 10 wherein beam means is disposed outwardly of said side walls and said air bags are interposed between the beams and the side walls and tension transmitting means is connected between the beams and said movable member.
Claim 13
Dependent Claim
27 words
An apparatus as described in claim 11 wherein spring means is interposed between the side walls and said movable member acting in opposition to the air bags.
Claim 14
Dependent Claim
20 words
An apparatus as described in claim 2 wherein valve means is provided between the inflation means and the air bags.
Claim 15
Dependent Claim
24 words
An apparatus as described in claim 13 wherein timing means is connected to the valve means to actuate the valve means at periodic intervals.
Claim 16
Independent Claim
52 words
The method of screening and separating materials which comprises placing the material on a tensioned reciprocating screen disposed on a support, during the screening of said material alternately releasing and tightening the tension on the screen while reciprocating the screen, to loosen particles which become lodged in the interstices of the screen.
Claim 17
Independent Claim
52 words
The method of screening and separating materials which comprises placing the material on a tensioned reciprocating screen disposed on a support, during the screening of said material alternately releasing and tightening the tension on the screen while reciprocating the screen, to loosen particles which become lodged in the interstices of the screen.
Claim 18
Dependent Claim
35 words
The method as described in claim 15 wherein the screen is loosened to the point where it moves away from and toward the support to provide a beating action of the screen against the support.
Claim 19
Dependent Claim
22 words
The method as described in claim 16 wherein the loosening and tightening of the screen is in timed relation to the reciprocation.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-11 | 1975-10-11 | 1976-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-11 | 1979-10-11 | 1980-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-11 | 1983-10-11 | 1984-04-11 | $7700.00 | Window Closed / Lapsed |