US3592128A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screw press
Assignee: French Oil Mill Machinery Co
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Filing: 1968-06-06
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Granted: 1971-07-13
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Expires: 1988-06-06
Abstract
Abstract A screw press has a cage defining an elongated pressing chamber, a screw extends within the chamber and has a plurality of worm bodies supporting a series of axially spaced helical flights receiving stationary breaker bars therebetween, and the flights have a hardened insert member removably connected to the corresponding body for resistance to wear and convenient reconditioning of the screw.
Inventors
- 👤 Alfred W French
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:53
CPC Classifications
B; B30; B30B; B30B9/00; B30B9/02; B30B9/12; B30B9/121
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
195 words
In a mechanical screw press having a cage forming an elongated cylindrical pressing chamber with an inlet end and a discharge end, a rotatable screw extending through said chamber and including a plurality of axially disposed worms each having an outwardly projecting integral helical flight, each said flight having a generally radially extending helical forward face, means cooperating with said flights for compressing material as it moves through said chamber toward said discharge end in response to rotation of said screw, and breaker-bar means including portions projecting from said cage into said chamber between said flights to resist rotation of the material with said flights; the improvement comprising means defining an arcuate cavity within said forward face of at least one of said flights and extending radially outwardly to the outer periphery of said flight, a separate arcuate hardened insert member recessed within said cavity and projecting outwardly to said outer periphery of said flight, the depth of said cavity corresponding substantially to the thickness of said insert member causing the forward surface of said insert member to be substantially flush with said face, and means for releasably securing said insert member within said cavity.
Claim 2
Dependent Claim
195 words
In a mechanical screw press having a cage forming an elongated cylindrical pressing chamber with an inlet end and a discharge end, a rotatable screw extending through said chamber and including a plurality of axially disposed worms each having an outwardly projecting integral helical flight, each said flight having a generally radially extending helical forward face, means cooperating with said flights for compressing material as it moves through said chamber toward said discharge end in response to rotation of said screw, and breaker-bar means including portions projecting from said cage into said chamber between said flights to resist rotation of the material with said flights; the improvement comprising means defining an arcuate cavity within said forward face of at least one of said flights and extending radially outwardly to the outer periphery of said flight, a separate arcuate hardened insert member recessed within said cavity and projecting outwardly to said outer periphery of said flight, the depth of said cavity corresponding substantially to the thickness of said insert member causing the forward surface of said insert member to be substantially flush with said face, and means for releasably securing said insert member within said cavity.
Claim 3
Dependent Claim
24 words
A screw press as defined in claim 1 including a plurality of said arcuate insert members disposed within said cavity in end-to-end abutting relation.
Claim 4
Dependent Claim
28 words
A screw press as defined in claim 1 wherein said means for releasably securing said insert member within said cavity, comprises at least one radiaLly extending interlocking wedge.
Claim 5
Dependent Claim
25 words
A screw press as defined in claim 1 including a coating of hard material forming the outer surface of said flight surrounding said insert member.
Claim 6
Dependent Claim
35 words
A screw press as defined in claim 1 including means forming a plurality of threaded holes within said insert member, and a corresponding plurality of bolts extending through said one flight and into said holes.
Claim 7
Dependent Claim
34 words
A screw press as defined in claim 1 wherein said securing means comprises clamping means mounted on the rear face of said flight, and threaded fastener means securing said clamping means to said flight.
Claim 8
Dependent Claim
29 words
A screw press as defined in claim 6 wherein said clamping means comprises a plurality of arcuately shaped clamping plates mounted on said rear face of said one flight.
Claim 9
Dependent Claim
40 words
A screw press as defined in claim 1 wherein said insert member comprises a relatively softer metal base portion, and a coating of hard material on said base portion arranged to form the forward peripheral surface of said one flight.
Claim 10
Dependent Claim
49 words
A screw press as defined in claim 1 wherein said insert member includes an inlaid strip forming at least a portion of the peripheral leading edge portion of said one flight, said strip having a hardness substantially greater than the hardness of the remaining portion of said insert member.
Claim 11
Dependent Claim
17 words
A screw press as defined in claim 9 wherein said inlaid strip is formed of tungsten carbide.
Claim 12
Dependent Claim
24 words
A screw press as defined in claim 1 wherein said securing means comprise at least one threaded fastener cast integrally to said insert member.
Claim 13
Dependent Claim
55 words
A screw press as defined in claim 1 wherein said insert member forms a portion of said one flight, rigid spacer means between said insert member and the other portion of said flight, and filler means between said insert member and said other portion of said flight to minimize tension forces within said insert member.
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) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |