US3773300A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plant for processing casting resin
Assignee: Pfeiffer A Vakuumtechnik dt GmbH
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Filing: 1972-02-22
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Granted: 1973-11-20
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Expires: 1992-02-22
Abstract
Abstract In a plant for preparing the constituent materials of a casting resin, a premixer forms a chamber for the constituent materials. A pump having a reciprocating piston is located within and at the outlet end of the premixer. The pump has a cylinder with at least one opening for receiving material from the chamber in the premixer. In the pump as the piston completes its suction stroke the opening is uncovered and materials flow into the cylinder and during the exhaust stroke of the piston the materials are discharged from the premixer outlet. The pump piston has a reciprocating rod which extends upwardly through the premixer chamber where it supports and actuates a mixing disk. Metering pumps receive the material from the premixers and deliver it into a final mixer. In the final mixer another reciprocating rod is provided with a mixing element for the final mixing and delivery of the materials to a metering head or a simple casting valve. Valves are provided for controlling and integrating the various operations of the plant.
Inventors
- 👤 E Hauser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:35
CPC Classifications
B; B01; B01F; B01F25/00; B01F25/70; B01F25/72; B29; B29B; B29B7/00; B29B7/74; B29B7/7476; B29B7/7485; B29B7/749; B01F31/00; B01F31/40; B01F31/44; B01F31/441; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/582
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
442 words
A plant for preparing casting resin from at least two constituent materials in which the plant comprises at least one upwardly extending premixer having an outlet at its lower end, said premixer having an upwardly extending axis and forming an axially extending chamber in which a vacuum can be established and said chamber arranged to receive one of the constituent materials and to provide a level of the material below the upper limit of the chamber in said premixer, a final mixer, at least one metering pump for supplying selected quantities of the constituent material from said premixer to said final mixer, and conduit means for conveying the material from said premixer to said metering pump and from said metering pump to said final mixer, wherein the improvement comprises means located at the outlet end of said premixer, said means forming a cylinder within said premixer which is in communication with the lower end of said chamber formed therein, said cylinder having an inlet and an outlet with its outlet located below its inlet and adjacent to the outlet from said premixer, said means including a piston pump having a piston axially displaceable within said cylinder between an upper position for admitting flow of the constituent material from said chamber into said cylinder and a lower position for blocking flow from said chamber into said cylinder, a mixing element located within said chamber in said premixer and operatively connected to said piston pump for upward and downward movement in said chamber passing above and below the level of the material in said chamber, said cylinder arranged to receive material from the body of material in the chamber of said premixer with said piston located within said cylinder and to discharge at least a portion of the material received from the premixer chamber from the outlet of said premixer to said meterIng pump, said piston forming a chamber in communication with the material in said cylinder, and said means including a bore communicating between the chamber in said piston and said premixer chamber for returning material from said cylinder upwardly into said premixer chamber, said cylinder being open at its upper end, and said piston having an outside diameter which is smaller than the inside diameter of said cylinder whereby a narrow annular gap is formed between the outside surface of said piston and the inside surface of said cylinder so that said piston does not contact the surface of said cylinder and material within said cylinder below said piston can flow upwardly through the annular gap to a point above said piston as it executes its downward exahust stroke through said cylinder.
Claim 2
Dependent Claim
442 words
A plant for preparing casting resin from at least two constituent materials in which the plant comprises at least one upwardly extending premixer having an outlet at its lower end, said premixer having an upwardly extending axis and forming an axially extending chamber in which a vacuum can be established and said chamber arranged to receive one of the constituent materials and to provide a level of the material below the upper limit of the chamber in said premixer, a final mixer, at least one metering pump for supplying selected quantities of the constituent material from said premixer to said final mixer, and conduit means for conveying the material from said premixer to said metering pump and from said metering pump to said final mixer, wherein the improvement comprises means located at the outlet end of said premixer, said means forming a cylinder within said premixer which is in communication with the lower end of said chamber formed therein, said cylinder having an inlet and an outlet with its outlet located below its inlet and adjacent to the outlet from said premixer, said means including a piston pump having a piston axially displaceable within said cylinder between an upper position for admitting flow of the constituent material from said chamber into said cylinder and a lower position for blocking flow from said chamber into said cylinder, a mixing element located within said chamber in said premixer and operatively connected to said piston pump for upward and downward movement in said chamber passing above and below the level of the material in said chamber, said cylinder arranged to receive material from the body of material in the chamber of said premixer with said piston located within said cylinder and to discharge at least a portion of the material received from the premixer chamber from the outlet of said premixer to said meterIng pump, said piston forming a chamber in communication with the material in said cylinder, and said means including a bore communicating between the chamber in said piston and said premixer chamber for returning material from said cylinder upwardly into said premixer chamber, said cylinder being open at its upper end, and said piston having an outside diameter which is smaller than the inside diameter of said cylinder whereby a narrow annular gap is formed between the outside surface of said piston and the inside surface of said cylinder so that said piston does not contact the surface of said cylinder and material within said cylinder below said piston can flow upwardly through the annular gap to a point above said piston as it executes its downward exahust stroke through said cylinder.
Claim 3
Dependent Claim
136 words
A plant, as set forth in claim 1, wherein said piston is axially displaceable through said cylinder in a suction stroke which terminates at a location remote from the outlet from said cylinder and an exhaust stroke which terminates at a location closer to said outlet than the location of the termination of the suction stroke, said cylinder extending from the outlet of said premixer into the body of material within said chamber in said premixer, said cylinder having at least one opening in the circumferential periphery thereof intermediate its ends for admitting material from the body of material in said premixer into said cylinder, and the opening in said cylinder being located between the outlet end of said cylinder and the location of the end of the suction stroke of said piston within said cylinder
Claim 4
Dependent Claim
56 words
A plant, as set forth in claim 2, wherein a plate is secured to and extends across the lower end of said cylinder adjacent the outlet end of said premixer, and said plate having a plurality of openings therethrough for discharging material from said cylinder during the downward exhaust stroke of said piston within said cylinder.
Claim 5
Dependent Claim
52 words
A plant, as set forth in claim 2, wherein a bypass line having an inlet end and an outlet end is secured at its inlet end to the outlet from said premixer and at its outlet end into said chamber in said premixer above the level of the body of material therein.
Claim 6
Dependent Claim
86 words
A plant, as set forth in claim 2, wherein said means includes a reciprocating rod positioned within and extending axially upwardly through said chamber in said premixer, said piston in said piston pump is secured to the lower end of said reciprocating rod and is located within said cylinder for executing a suction stroke and an exhaust stroke therein, and said mixing element in said chamber formed by said premixer is secured to and extends transversely from said reciprocating rod within said chamber in said premixer.
Claim 7
Dependent Claim
81 words
A plant, as set forth in claim 5, wherein the portion of said chamber within which said mixing element reciprocates is cylindrically shaped, said mixing element has a disk-like shape and the outside diameter of said disk-like shaped mixing element is less than the inside diameter of the portion of said chamber in which said mixing element reciprocates in said premixer for forming an annular flow space between the outer periphery of said disk in the inner surface of said chamber.
Claim 8
Dependent Claim
78 words
A plant, as set forth in claim 6, wherein a pressure cylinder disposed above said premixer and in axially alignment with said reciprocating rod, the upper end of said reciprocating rod extending into said pressure cylinder, a piston secured to the upper end of said reciprocating rod within said pressure cylinder, and means for supplying a pressurized fluid into said pressure cylinder on the opposite sides of said piston for effecting the reciprocating action of said reciprocating rod.
Claim 9
Dependent Claim
37 words
A plant, as set forth in claim 6, wherein said disk-like mixing element is perforated so that material can pass through the perforations as said mixing element is reciprocated by said reciprocating rod within said premixer chamber.
Claim 10
Dependent Claim
153 words
A plant, as set forth in claim 5, wherein said piston of saId piston pump located on the lower end of said reciprocating rod within said cylinder comprises walls forming the chamber in said piston which is open at its downward end, a plate extending across and forming a closure for the lower end of said chamber in said piston, said plate having a plurality of bores therethrough communicating between the interior of said cylinder and the interior of said chamber in said piston, and said reciprocating rod forming the bore which extends axially through said reciprocating rod from said chamber in said piston upwardly to a location in said reciprocating rod above the level of the body of material within said chamber in said premixer so that material entering into the chamber formed by said piston passes upwardly through said bore for return into the body of material within said premixer chamber.
Claim 11
Dependent Claim
48 words
A plant, as set forth in claim 9, wherein means secured to said reciprocating rod in communication with said bore therethrough for returning the material into said premixer chamber, said means comprising an overpressure valve through which the material passes before it is returned into said premixer chamber.
Claim 12
Dependent Claim
98 words
A plant, as set forth in claim 10, wherein said means connected to said bore in said reciprocating rod comprising a plurality of lines extending radially outwardly from said reciprocating rod, one said overpressure valve located in each said line, and a nozzle secured to the outlet end of each said line for discharging the material into said premixer chamber with a tangential component relative to an imaginary cylinder within said premixer chamber passing through the outlet ends of said lines and a downward component directed toward the level of the body of material within said premixer chamber.
Claim 13
Dependent Claim
78 words
A plant, as set forth in claim 10, wherein said means communicating with said bore through said reciprocating rod are located at a spaced distance above said mixing element secured to said reciprocating rod so that during the reciprocating action of said rod means are located above the level of the body of material within said premixer chamber while said mixing element moves upwardly and downwardly into an out of the body of material is said premixer chamber.
Claim 14
Dependent Claim
23 words
A plant, as set forth in claim 1, wherein means for initiating a reciprocating action within said final mixer and said metering pump.
Claim 15
Dependent Claim
191 words
A plant, as set forth in claim 13, wherein said final mixer comprises a lower upwardly extending part and an upper part extending upwardly from the upper end of said lower part, said upper part forming an upwardly extending cylindrical space closed at its lower end by the upper end of said lower part and having an inside surface with an inside diameter, said lower part forming a pressure cylinder and an opening extending through said lower part from said pressure cylinder to said cylindrical space in said upper part, and said means for effecting reciprocating action in said final mixer comprosing a reciprocating rod extending upwardly from said pressure cylinder in said lower part into said cylindrical space in said upper part, seal means disposed between said reciprocating rod and said lower part in the opening extending through said lower part communicating with said cylindrical space in said upper part, a piston secured to the lower end of said reciprocating rod within said pressure cylinder in said lower part, and a mixing element secured to the upper end of said reciprocating rod within said cylindrical space in said upper part.
Claim 16
Dependent Claim
97 words
A plant, as set forth in claim 14, wherein said mixing element secured to the upper end of said reciprocating rod in said final mixer comprises a disk-shaped element having an outside diameter slightly smaller than the inside diameter of said cylindrical space in said upper part so that a narrow annular space is provided between the outside periphery of said mixing element and the inside surface of said cylindrical space in said upper part, and said disk-shaped element being perforated tO permit constituent materials supplied into said cylindrical space in said upper part to pass therethrough.
Claim 17
Dependent Claim
192 words
A plant, as set forth in claim 14, wherein said mixing element comprises a plurality of transversely arranged disks secured to said reciprocating rod and extending transversely therefrom, said disks comprising an upper disk and a lower disk having a diameter slightly smaller than the inside diameter of said cylindrical space in said upper part for forming narrow annular gaps between the outside periphery of said disks and the inside surface of said cylindrical space in said upper part, said upper and lower disks being perforated for passing constituent materials therethrough, and at least one intermediate disk spaced between said upper and lower disks and having an eccentric peripheral surface spaced a greater distance from the inside surface of said cylindrical space in said upper part at one point than at a diametrically opposed point so that an annular space of non-uniform width is formed between the outside of said intermediate disk and the inside surface of said cylindrical space in said upper part, so that material passing through the perforations in said upper and lower disks effects at least partly circular motion due to the eccentric shape of said intermediate disk.
Claim 18
Dependent Claim
50 words
A plant, as set forth in claim 14, wherein means are disposed within said cylindrical in said upper part of said final mixer for forming a movable transversely extending wall defining the upper end of a mixing chamber formed within the lower part of said cylindrical within said upper part.
Claim 19
Dependent Claim
139 words
A plant, as set forth in claim 17, wherein said means comprises a storage piston, a resiliently biased feeler member extending through the wall of said upper part of said final mixer into contact with a surface on said storage piston defining the upper end of the mixing chamber, a groove in the surface on said storage piston for receiving said feeler when said means move downwardly, a first electrical contact positioned on the outer surface of said upper part in engagement with said feeler, a second electrical contact disposed on the outside of said upper part and arranged to be contacted by said electrical contact when said feeler is seated within the groove in the surface of said storage piston when said storage piston has reached a predetermined lower level within said cylindrical space in said upper part.
Claim 20
Dependent Claim
64 words
A plant, as set forth in claim 18, wherein means are provided for responding to the contact between said first electrical contact and said second electrical contact for effecting coordinated reciprocal movements in said premixers, metering pumps, and final mixer for supplying constituent materials from the cylinder in said premixer to said metering pumps and then to the mixing chamber in said final mixer.
Claim 21
Dependent Claim
129 words
A plant, as set forth in claim 17, wherein said means defining the upper limit of the mixing chamber within said cylindrical space in said upper part of said final mixer comprises a storage piston located within said cylindrical space and extending upwardly therethrough above said mixing element therein, said cylindrical space in said upper part forming a pressure chamber at its upper end within which the upper end of said storage piston is located, seal means disposed between the sides of said storage piston and the inside surface of said cylindrical space in said upper part, and an inlet duct connected to said pressure chamber for admitting a pressurized fluid therein for urging said storage piston in the downward direction through said cylindrical space in the upper part.
Claim 22
Dependent Claim
72 words
A plant, as set forth in claim 20, wherein said lower part of said fixed mixer having an annular groove formed in the opening extending between said pressure chamber and the upper end of said lower part, an annular groove formed in the inner surface of said upper part in the range of said storage piston and duct means communicating with both of said annular grooves for effecting a flushing actiOn therethrough.
Claim 23
Dependent Claim
43 words
A plant, as set forth in claim 20, wherein means disposed within said cylinder in the upper part of said final mixer for supplying constituent materials into the mixing chamber formed in the lower end of said cylindrical space in said upper part.
Claim 24
Dependent Claim
155 words
A plant, as set forth in claim 22, wherein said means for supplying constituent materials into said mixing chamber comprises an annular member positioned within said cylinder and having a portion of its outer surface in contact with the inner surface of said cylindrical space in said upper part, said annular member extending transversely across said cylindrical space in said upper part and having an annular channel-shaped groove formed about its outer surface so that in combination with the inner surface of said cylindrical space in said upper part said groove provides an annular inlet chamber, an inlet duct extending through said upper part into communication with said inlet chamber, said annular member having a plurality of angularly spaced openings therethrough communicating between the inlet chamber and the interior of said mixing chamber in said cylindrical space in said upper part for supplying a constituent material into said mixing chamber in a plurality of jets.
Claim 25
Dependent Claim
133 words
A plant, as set forth in claim 23, wherein said upper part having an annular groove formed in its inner surface extending upwardly from the upper end of said annular member, the lower end of said storage piston being disposed opposite said annular groove and forming therewith a second inlet chamber for supplying constituent material into said mixing chamber in said final mixer, the outside diameter of said storage piston being slightly less than the inside diameter of said annular member located below said annular groove so that a narrow annular outlet opening is provided from said second inlet chamber for admitting a thin film-like flow of the constituent material from said second inlet chamber into the mixing chamber passing downwardly through the jets from said inlet chamber formed by said annular 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) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |