Patent US4772177A successfully refreshed from Google Patents.
US4772177A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screw pump
Assignee: HAYASHI SEIKO Co Ltd 2-7 5-BANCHO MINAMI SAKO TOKUSHIMA-SHI TOKUSHIMA-KEN JAPAN A CORP OF JAPAN
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Filing: 1987-05-29
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Granted: 1988-09-20
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Expires: 2007-05-29
Abstract
Abstract This invention relates to a screw pump for feeding mixed concrete and the like, sticky material such as adhesive fluid without bitting and clogging and feeding them continuously and effectively. For preventing the bitting, a bearing is provided at the inlet of outer cylinder of the pump and inner sleeve of the bearing is fixed to the edge of screw. For preventing the clogging, a multiple of partition plates is inserted between the blade of the screw which can slide along the shaft of the screw.
Inventors
- 👤 Akira Hayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:58
CPC Classifications
F; F04; F04C; F04C2/00; F04C2/08; F04C2/10; F04C2/107; B; B01; B01F; B01F35/00; B01F35/10; B01F35/145; F04C3/00; F04C3/02; F04C3/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
135 words
A screw pump comprising: an outer cylinder having a linear central axis, a cylindrical inner wall, an an axially extending groove in said inner wall, a helical screw extending axially inside said cylinder; drive means for driving said helical screw; a plurality of partitioning plates axially slidably fitted in said groove so as to be movable with said helical screw in an axial direction of said shaft and to be restrained against movement in a direction around said axis; and said plurality of partitioning plates constructed and arranged to engage said helical screw and fit between adjacent sections of said helix whereby to move axially and not rotatably when the screw is rotated around its axis; whereby adjacent revolving helical sections are partitioned from each other by said plates to prevent clogging of said pump.
Claim 2
Dependent Claim
135 words
A screw pump comprising: an outer cylinder having a linear central axis, a cylindrical inner wall, an an axially extending groove in said inner wall, a helical screw extending axially inside said cylinder; drive means for driving said helical screw; a plurality of partitioning plates axially slidably fitted in said groove so as to be movable with said helical screw in an axial direction of said shaft and to be restrained against movement in a direction around said axis; and said plurality of partitioning plates constructed and arranged to engage said helical screw and fit between adjacent sections of said helix whereby to move axially and not rotatably when the screw is rotated around its axis; whereby adjacent revolving helical sections are partitioned from each other by said plates to prevent clogging of said pump.
Claim 3
Dependent Claim
66 words
The screw pump according to claim 1 in which an entrance hole is provided through the wall of the cylinder at one end of said groove and an exit hole at the other end of said groove; said partitioning plate being insertable into said continuous groove in said outer cylinder through said entrance hole for advancement through said outer cylinder and removable through said exit hole.
Claim 4
Dependent Claim
20 words
The screw pump according to claim 2 in which said plurality of partitioning plates are mounted on a revolving chain.
Claim 5
Dependent Claim
52 words
The screw pump according to claim 1 in which said groove comprises a slot through said wall extending along substantially its entire length; and conveyor means feeding said plurality of partitioning plates through said slot into said outer cylinder between adjacent sections of said helical screw for advancement with said helical screw.
Claim 6
Dependent Claim
74 words
The screw pump according to claim 1 in which said outer cylinder has a longitudinal slot; support means vertically supporting said plurality of partitioning plates in said longitudinal slot; said support means constructed and arranged to sequentially lower said plurality of partition plates into said outer cylinder between adjacent helical sections of said screw, advance said plurality of partition plates and raise said plurality of partitioning plates near the end of said longitudinal slot.
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) | 1991-09-20 | 1992-03-21 | 1992-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-20 | 1996-03-21 | 1996-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-20 | 2000-03-21 | 2000-09-20 | $7700.00 | Window Closed / Lapsed |