US4009974A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for pumping viscous material
Assignee: Nordson Corp
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Filing: 1975-12-15
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Granted: 1977-03-01
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Expires: 1995-12-15
Abstract
Abstract An apparatus for melting and dispensing thermoplastic material comprising a hopper, a grid melter, a reservoir and a pump. The novelty of this application resides in a novel method and apparatus for forcing molten material into the pump inlet. The infeed is accomplished by a pair of counter-rotating shafts to which the molten material is supplied and from which it is sheared by a pair of inclined surfaces. In the process of being sheared from the counter-rotating shafts the molten material is forced into the pump inlet.
Inventors
- 👤 Charles H. Scholl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:47
CPC Classifications
F; F04; F04C; F04C13/00; F04C13/001; F04C13/002; B; B29; B29B; B29B13/00; B29B13/02; B29B13/022; Y; Y10; Y10S; Y10S417/00; Y10S417/90
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
113 words
The method of pumping viscous liquid material which comprises, supplying the liquid material into contact with a rotating shaft to which it adheres upon contact, shearing said liquid material from contact with the rotating shaft by means of a shear surface located in close proximity to the peripheral surface of said shaft, said shear surface being inclined relative to the peripheral surface of said shaft, entrapping said liquid material as it is sheared from said shaft within an entrapment chamber, which entrapment chamber communicates with a pump inlet passage, and causing liquid material as it is sheared from said rotating shaft to force material contained within said entrapment chamber to exit through said
Claim 2
Independent Claim
113 words
The method of pumping viscous liquid material which comprises, supplying the liquid material into contact with a rotating shaft to which it adheres upon contact, shearing said liquid material from contact with the rotating shaft by means of a shear surface located in close proximity to the peripheral surface of said shaft, said shear surface being inclined relative to the peripheral surface of said shaft, entrapping said liquid material as it is sheared from said shaft within an entrapment chamber, which entrapment chamber communicates with a pump inlet passage, and causing liquid material as it is sheared from said rotating shaft to force material contained within said entrapment chamber to exit through said
Claim 3
Dependent Claim
38 words
The method of claim 1 which further comprises moving said liquid material from said pump inlet into the inlet chamber of a gear pump, and causing said liquid material to be moved through a pump outlet by gears
Claim 4
Independent Claim
116 words
The method of pumping viscous liquid material which comprises, supplying the liquid material into contact with a pair of counter-rotating shafts to which the material adheres upon contact, shearing said liquid material from contact with the counter-rotating shafts by means of a surface located in close proximity to said peripheral surfaces of said shafts and inclined relative to the peripheral surfaces of said shafts, entrapping said liquid material as it is sheared from said shafts within an entrapment chamber located between said shafts, which entrapement chamber communicates with a pump inlet passage, and causing incoming liquid material as it is sheared from said rotating shafts to force material contained within said entrapment chamber to exit through
Claim 5
Independent Claim
116 words
The method of pumping viscous liquid material which comprises, supplying the liquid material into contact with a pair of counter-rotating shafts to which the material adheres upon contact, shearing said liquid material from contact with the counter-rotating shafts by means of a surface located in close proximity to said peripheral surfaces of said shafts and inclined relative to the peripheral surfaces of said shafts, entrapping said liquid material as it is sheared from said shafts within an entrapment chamber located between said shafts, which entrapement chamber communicates with a pump inlet passage, and causing incoming liquid material as it is sheared from said rotating shafts to force material contained within said entrapment chamber to exit through
Claim 6
Dependent Claim
39 words
The method of claim 3 which further comprises moving said liquid material from said pump inlet into the inlet chamber of a gear pump, and causing said liquid material to be moved through a pump outlet by means of
Claim 7
Independent Claim
72 words
The method of pumping viscous liquid material which comprises, supplying the liquid material into contact with a pair of counter-rotating shafts to which the material adheres upon contact, directing said liquid material between said counter-rotating shafts and into an entrapment chamber, which entrapment chamber communicates with a pump inlet passage, causing incoming liquid material as it is moved by said counter-rotating shafts into said chamber to force liquid material contained within said
Claim 8
Independent Claim
72 words
The method of pumping viscous liquid material which comprises, supplying the liquid material into contact with a pair of counter-rotating shafts to which the material adheres upon contact, directing said liquid material between said counter-rotating shafts and into an entrapment chamber, which entrapment chamber communicates with a pump inlet passage, causing incoming liquid material as it is moved by said counter-rotating shafts into said chamber to force liquid material contained within said
Claim 9
Dependent Claim
51 words
The method of claim 5 which further comprises moving said liquid material from said pump inlet into the inlet chamber of a gear pump, and causing said liquid material to be moved through a pump outlet by means of rotating gears secured to said shafts and located within said gear pump.
Claim 10
Dependent Claim
45 words
Apparatus for pumping viscous liquid material, which apparatus comprises, a pump having an inlet, an outlet and a rotatable drive shaft, means for supplying the liquid material into contact with said rotatable drive shaft, means for shearing said liquid material from contact with the rotating
Claim 11
Dependent Claim
45 words
Apparatus for pumping viscous liquid material, which apparatus comprises, a pump having an inlet, an outlet and a rotatable drive shaft, means for supplying the liquid material into contact with said rotatable drive shaft, means for shearing said liquid material from contact with the rotating
Claim 12
Dependent Claim
23 words
The apparatus of claim 7 in which said shearing and directing means includes an inclined surface located in close proximity to the peripheral
Claim 13
Dependent Claim
38 words
Apparatus for pumping viscous liquid material, which apparatus comprises, a pump having an inlet and outlet, a pair of counter-rotating shafts to which the material adheres upon contact, means for shearing said liquid material from contact with the
Claim 14
Dependent Claim
38 words
Apparatus for pumping viscous liquid material, which apparatus comprises, a pump having an inlet and outlet, a pair of counter-rotating shafts to which the material adheres upon contact, means for shearing said liquid material from contact with the
Claim 15
Dependent Claim
23 words
The apparatus of claim 10 in which said shearing and directing means include an inclined surface located in close proximity to said shafts.
Claim 16
Dependent Claim
28 words
The apparatus of claim 11 in which said pump is a gear pump and in which one of said shafts is a drive shaft of said gear pump.
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) | 1980-02-29 | 1980-08-30 | 1981-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-29 | 1984-08-30 | 1985-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-29 | 1988-08-30 | 1989-03-01 | $7700.00 | Window Closed / Lapsed |