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US3700372A
Expired / Lapsed
US
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Pump impeller molding apparatus
Assignee: March Manufacturing Co
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Filing: 1969-12-23
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Granted: 1972-10-24
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Expires: 1989-12-23
Abstract
Abstract Apparatus for molding a plastic pump impeller having an annular coupling magnet totally enclosed and sealed within a hub formation traversed by a shaft bore. The plastic melt is injected into a special mold having movable core and magnet-supporting parts and means for actuating the same in a time sequence such that the melt forms the impeller configurations at one end of the magnet while the shaft bore is temporarily blocked off. The melt is caused to flow about the external aspects of the magnet toward the distal end thereof and then to resume the flow with timed opening up of the shaft bore to line the latter and complete the total envelopment of the magnet in unitary joinder with the impeller.
Inventors
- 👤 Donald P Lalley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:02
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/18; F04D29/22; F04D29/2205; F04D29/2222; F04D29/2227; B; B29; B29C; B29C45/00; B29C45/14; B29C45/14065; B29C45/14073; F04D13/00; F04D13/02; F04D13/021; F04D13/024; B29C45/14639; B29L; B29L2031/00; B29L2031/08; B29L2031/087; F05; F05D; F05D2230/00; F05D2230/20; F05D2300/00; F05D2300/40; F05D2300/43
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
418 words
Mold means adapted to receive an injected plastic melt for forming as a unitary body a pump impeller having a through bore for a shaft, together with an annular magnet totally sealed therein concentrically with said bore, said mold means comprising a mold structure including separable mold sections having respective cavity configurations defining said body in the closed condition thereof; compound core means for the shaft bore comprising elongated and respectively fixed and movable core members the movable one of which is adapted to telescope with the fixed member in said closed condition, the fixed core member projecting from a particular wall portion of the cavity configurations in one of said sections, and the movable core member being carried at one supported end thereof in the other section by movable means operative to advance and retract such core member axially into and from telescoped interfit with the fixed member, said core members being spaced apart in the separated open condition of the mold sections to admit placement of a magnet annulus upon the fixed member, said movable core member in the advanced condition thereof being moved into interfit with the fixed member by closure of the mold sections to complete a core structure defining said shaft bore and blocking off entry of the melt therein; the supported magnet having an axial end proximate to the impeller configurations of said body and a distal end remote therefrom and confronting said particular wall portion of the mold cavity, said particular wall portion communicating with adjoining cavity portions surrounding the outer cylindrical aspect of the magnet such that the melt can progress from said aspect to fill over said distal end; duct means for admitting and guiding injected plastic melt into the mold structure in a general direction to fill into the impeller configurations at the proximate end of the magnet and progress over said cylindrical aspect and thence over said distal end thereof with a tendency to move finally into the bore from which it is blocked, however, by the presence of the interfitted movable core member until the latter is withdrawn; registry means including at least one registry member movable for advance into and retraction from a registry position between said particular mold wall portion and the distant end of the magnet to space the latter for filling of the melt thereover as aforesaid; and actuating means operable to move said movable core member and said registry means independently to and from the respective advanced and retracted positions thereof.
Claim 2
Dependent Claim
418 words
Mold means adapted to receive an injected plastic melt for forming as a unitary body a pump impeller having a through bore for a shaft, together with an annular magnet totally sealed therein concentrically with said bore, said mold means comprising a mold structure including separable mold sections having respective cavity configurations defining said body in the closed condition thereof; compound core means for the shaft bore comprising elongated and respectively fixed and movable core members the movable one of which is adapted to telescope with the fixed member in said closed condition, the fixed core member projecting from a particular wall portion of the cavity configurations in one of said sections, and the movable core member being carried at one supported end thereof in the other section by movable means operative to advance and retract such core member axially into and from telescoped interfit with the fixed member, said core members being spaced apart in the separated open condition of the mold sections to admit placement of a magnet annulus upon the fixed member, said movable core member in the advanced condition thereof being moved into interfit with the fixed member by closure of the mold sections to complete a core structure defining said shaft bore and blocking off entry of the melt therein; the supported magnet having an axial end proximate to the impeller configurations of said body and a distal end remote therefrom and confronting said particular wall portion of the mold cavity, said particular wall portion communicating with adjoining cavity portions surrounding the outer cylindrical aspect of the magnet such that the melt can progress from said aspect to fill over said distal end; duct means for admitting and guiding injected plastic melt into the mold structure in a general direction to fill into the impeller configurations at the proximate end of the magnet and progress over said cylindrical aspect and thence over said distal end thereof with a tendency to move finally into the bore from which it is blocked, however, by the presence of the interfitted movable core member until the latter is withdrawn; registry means including at least one registry member movable for advance into and retraction from a registry position between said particular mold wall portion and the distant end of the magnet to space the latter for filling of the melt thereover as aforesaid; and actuating means operable to move said movable core member and said registry means independently to and from the respective advanced and retracted positions thereof.
Claim 3
Dependent Claim
66 words
Apparatus according to claim 1 wherein the advanced position of said registry member and direction of progress of the melt is such as to have a tendency to force the magnet and the distal end thereof in an axial direction against said member whereby to afford a uniform cavity space thereat and consequent uniform wall thickness of the plastic over said distal end of the magnet.
Claim 4
Dependent Claim
66 words
Apparatus according to claim 1 further characterized in that there are a plurality of said registry members arranged about the axial center of the shaft bore at said distal end of the magnet and said members are jointly movable by the appertaining actuating means in approximate parallelism with the axis of the shaft bore in moving into and from said advanced and retracted registry position thereof.
Claim 5
Dependent Claim
57 words
Apparatus according to claim 1 wherein said elongated fixed core member is mounted at one end upon said particular wall portion concentrically with the center of the axis of the shaft bore and said registry member is a pin reciprocable in said particular wall portion at a location disposed radially of said center for movement as aforesaid.
Claim 6
Dependent Claim
44 words
Apparatus according to claim 1 wherein said actuating means comprises separate reversible hydraulic piston devices respectively having driving connection with one of said registry members and movable core members and respectively operative to move the same in the manner and for the purposes aforesaid.
Claim 7
Dependent Claim
26 words
Apparatus according to claim 5 wherein the hydraulic piston devices respectively driving the registry means and movable core member are contained within the appertaining mold sections.
Claim 8
Dependent Claim
104 words
Mold means in accordance with claim 1 wherein said mold sections meet along a parting line which intercepts the cavity configurations defining the impeller configurations of said body, and said melt-admitting and guiding duct means has an injection entry in the mold section having the movable core member communication through duct passages along said parting line into said impeller defining cavity configurations, such that in the closed condition of the sections the melt first enters said last-mentioned configurations to fill the same and then progresses therefrom over the cylindrical aspects to the distal end of the magnet supported on the core means as aforesaid.
Claim 9
Dependent Claim
319 words
Molding apparatus for forming a principal plastic object by injection of a melt into a mold cavity, said object having totally included therein a second and previously formed object of a character which will not be materially affected by the temperature required for the melt, said apparatus comprising relatively separable mold members cooperatively defining a cavity formation for the configuration of the principal object in closed condition of the mold members; and an elongated compound core structure comprising relatively fixed and movable elongated core members, one of which is fixed at one end in one of said mold members and projects axially into a part of said cavity formation, and the other of which is carried by the remaining mold member in axial alignment with the fixed core member, one said core member telescoping with the other; drive means operatively associated with the mold member having the movable core member and operative to move said movable core member into and withdraw it from telescoped relation with the fixed core member in the closed condition of said mold members, at least; said movable core member being adapted to support said second object in withdrawn condition and carry the same with it in telescoping with the fixed core member to dispose the second object in a predetermined position in said cavity formation in the closed condition of the mold members; and means for guiding melt in said closed mold members into said cavity formation along a predetermined path to form the principal object and partly envelope the second object while the core members are in telescoped relation, and thereafter permit completion of the flow of the melt responsive to withdrawal of the movable core member from telescoped relation with the fixed member by actuation of said drive means while the mold members are still in closed condition, whereby to complete the principal object with total envelopment thereby of the second object.
Claim 10
Dependent Claim
319 words
Molding apparatus for forming a principal plastic object by injection of a melt into a mold cavity, said object having totally included therein a second and previously formed object of a character which will not be materially affected by the temperature required for the melt, said apparatus comprising relatively separable mold members cooperatively defining a cavity formation for the configuration of the principal object in closed condition of the mold members; and an elongated compound core structure comprising relatively fixed and movable elongated core members, one of which is fixed at one end in one of said mold members and projects axially into a part of said cavity formation, and the other of which is carried by the remaining mold member in axial alignment with the fixed core member, one said core member telescoping with the other; drive means operatively associated with the mold member having the movable core member and operative to move said movable core member into and withdraw it from telescoped relation with the fixed core member in the closed condition of said mold members, at least; said movable core member being adapted to support said second object in withdrawn condition and carry the same with it in telescoping with the fixed core member to dispose the second object in a predetermined position in said cavity formation in the closed condition of the mold members; and means for guiding melt in said closed mold members into said cavity formation along a predetermined path to form the principal object and partly envelope the second object while the core members are in telescoped relation, and thereafter permit completion of the flow of the melt responsive to withdrawal of the movable core member from telescoped relation with the fixed member by actuation of said drive means while the mold members are still in closed condition, whereby to complete the principal object with total envelopment thereby of the second object.
Claim 11
Dependent Claim
30 words
Apparatus according to claim 8 further characterized in that said drive means is hydraulically actuated and contained within that one of the mold members which has the movable core member.
Claim 12
Dependent Claim
88 words
Apparatus according to claim 8 further characterized in that a movable registry member is included as a part of the particular mold member having the fixed core member, together with second drive means operativelY associated with said particular mold member and operative to move said registry member to and from engagement with said second object in the telescoped relation of said core members to space said second object a predetermined distance from a part of said cavity formation and thereby determine a portion of said predetermined flow path.
Claim 13
Dependent Claim
40 words
Apparatus according to claim 10 wherein the respective drive means comprises reversible hydraulically driven piston means having connection with said movable core member and registry member for respectively actuating the same in the manner and for the purposes set forth.
Claim 14
Dependent Claim
285 words
In a mold for forming a principal object from a plastic melt injected therein under pressure and having a secondary object wholly contained therein, separable mold members defining a forming cavity for the principal object in their closed relation; a first elongated core member affixed at one end to one of said mold members and projecting with a free end into said cavity; a second core member having one end mounted in the other said mold member and a tubular portion extending to a free end thereof and movable axially onto and from closing telescoped engagement with the first core member over the free end thereof to block flow about said first core member, said movable core member being adapted to support said secondary object by placement of the latter thereon in the open condition of said mold members, said supported secondary object being disposed in a predetermined position in said cavity in closing telescoped relationship of the movable core member as aforesaid in the closed condition of the mold members; and means in one of said mold members, at least, directing injected plastic melt along a predetermined flow path into said cavity to form said principal object and cover outer portions of the supported secondary object not blocked by said telescoped core members; and reversely operable actuating means cooperable with the supporting means for the movable core member and operative to move the latter to and from telescoped relation with the fixed core member such that said melt can flow about the fixed core member responsive to withdrawal of the movable core member from closing telescoped engagement as aforesaid to complete the formation of the principal object with total envelopment of the secondary object.
Claim 15
Dependent Claim
285 words
In a mold for forming a principal object from a plastic melt injected therein under pressure and having a secondary object wholly contained therein, separable mold members defining a forming cavity for the principal object in their closed relation; a first elongated core member affixed at one end to one of said mold members and projecting with a free end into said cavity; a second core member having one end mounted in the other said mold member and a tubular portion extending to a free end thereof and movable axially onto and from closing telescoped engagement with the first core member over the free end thereof to block flow about said first core member, said movable core member being adapted to support said secondary object by placement of the latter thereon in the open condition of said mold members, said supported secondary object being disposed in a predetermined position in said cavity in closing telescoped relationship of the movable core member as aforesaid in the closed condition of the mold members; and means in one of said mold members, at least, directing injected plastic melt along a predetermined flow path into said cavity to form said principal object and cover outer portions of the supported secondary object not blocked by said telescoped core members; and reversely operable actuating means cooperable with the supporting means for the movable core member and operative to move the latter to and from telescoped relation with the fixed core member such that said melt can flow about the fixed core member responsive to withdrawal of the movable core member from closing telescoped engagement as aforesaid to complete the formation of the principal object with total envelopment of the secondary object.
Claim 16
Dependent Claim
240 words
Apparatus for molding a plastic pump impeller having a shaft bore and an annular coupling magnet sealed within its confines in concentricity with said bore, which comprises supporting means for the magnet including a core means in the cavity of a mold having a fixed elongated core rod and a coaxially movable core rod with hollow portions telescoping onto the fixed rod, said magnet being supported upon the hollow one of said rods in the separated condition thereof, means operative to bring said rods into telescoped relationship to afford support along the bore of the magnet annulus and to define a shaft bore for the impeller; means guiding flow of injected plastic melt into said cavity in a region thereof defining impeller configurations located at a proximate axial end of the magnet to flow progressively along the outer cylindrical aspects thereof and onto the opposite distal end of the magnet; means spacing said distal end of the magnet temporarily from a wall of the cavity to permit the melt to cover said distal end, means operative in timed relation to said melt flow to withdraw the movable core member from telescoped engagement with the fixed core member to permit further flow of the melt into the shaft bore about the fixed core member as the movable core member retreats whereby to line said bore and complete the total envelopment of the magnet as a wholly contained part of the impeller.
Claim 17
Dependent Claim
240 words
Apparatus for molding a plastic pump impeller having a shaft bore and an annular coupling magnet sealed within its confines in concentricity with said bore, which comprises supporting means for the magnet including a core means in the cavity of a mold having a fixed elongated core rod and a coaxially movable core rod with hollow portions telescoping onto the fixed rod, said magnet being supported upon the hollow one of said rods in the separated condition thereof, means operative to bring said rods into telescoped relationship to afford support along the bore of the magnet annulus and to define a shaft bore for the impeller; means guiding flow of injected plastic melt into said cavity in a region thereof defining impeller configurations located at a proximate axial end of the magnet to flow progressively along the outer cylindrical aspects thereof and onto the opposite distal end of the magnet; means spacing said distal end of the magnet temporarily from a wall of the cavity to permit the melt to cover said distal end, means operative in timed relation to said melt flow to withdraw the movable core member from telescoped engagement with the fixed core member to permit further flow of the melt into the shaft bore about the fixed core member as the movable core member retreats whereby to line said bore and complete the total envelopment of the magnet as a wholly contained part of the impeller.
Claim 18
Dependent Claim
259 words
Apparatus for molding a plastic pump impeller of the type comprising a body having impeller configurations situated at one axial end of a hub configuration and an annular coupling magnet totally contained and sealed within said hub configuration and a shaFt bore extending through a distal axial end of the hub configuration and the magnet annulus and through the opposite axial end of the magnet annulus which is proximate to the impeller configurations and which opens through the latter configurations, said apparatus comprising an elongated core member in the impeller-forming molding cavity formed by complementary separable and closable mold sections, the core member comprising separable coaxial relatively telescoping portions concentric with the required shaft bore and axially separable by movement of the movable one of the core members and also by opening movement of the appertaining mold section on separation from the companion section, means guiding injected plastic melt along a predetermined path within said mold sections in closed condition, said path leading first into impeller forming configurations of said cavity and thence about the outer cylindrical aspects of the magnet annulus to the distal end thereof; means spacing said distal end of the magnet from a wall portion of the cavity to form a plastic coating over said distal end; and means operative to separate the movable core member from the fixed core member to admit movement of the melt for full flow about the fixed core member thereby coating the inner the magnet annulus and defining a fully plastic lined shaft bore passage through the entire impeller.
Claim 19
Dependent Claim
259 words
Apparatus for molding a plastic pump impeller of the type comprising a body having impeller configurations situated at one axial end of a hub configuration and an annular coupling magnet totally contained and sealed within said hub configuration and a shaFt bore extending through a distal axial end of the hub configuration and the magnet annulus and through the opposite axial end of the magnet annulus which is proximate to the impeller configurations and which opens through the latter configurations, said apparatus comprising an elongated core member in the impeller-forming molding cavity formed by complementary separable and closable mold sections, the core member comprising separable coaxial relatively telescoping portions concentric with the required shaft bore and axially separable by movement of the movable one of the core members and also by opening movement of the appertaining mold section on separation from the companion section, means guiding injected plastic melt along a predetermined path within said mold sections in closed condition, said path leading first into impeller forming configurations of said cavity and thence about the outer cylindrical aspects of the magnet annulus to the distal end thereof; means spacing said distal end of the magnet from a wall portion of the cavity to form a plastic coating over said distal end; and means operative to separate the movable core member from the fixed core member to admit movement of the melt for full flow about the fixed core member thereby coating the inner the magnet annulus and defining a fully plastic lined shaft bore passage through the entire impeller.
References Cited (Backward Citations)
US2469130A
Cited
US3543349A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |