US3767056A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Injection molding filter
Assignee: A-1 Engineering Inc
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Filing: 1971-08-06
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Granted: 1973-10-23
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Expires: 1991-08-06
Abstract
Abstract A filtering device for use in high pressure injection molding apparatus. The filter consists of a housing having a material flow inlet and outlet, the housing having a longitudinal bore which communicates with the inlet and outlet. A cylindrical member having a plurality of radially disposed filtration openings is positioned in the longitudinal bore to define first and second concentrically disposed flow passages. A valve member comprising a tapered pin with a transverse bore registrable with the first passage is rotatable to either block the first passage and thereby effect filtering flow through the radially disposed holes and second passage, or to permit a purge flow through the essentially unrestricted first passage.
Inventors
- 👤 G Neuman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:11
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/20; B29C45/24; B29C45/1753
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
279 words
Apparatus for filtering melted plastic delivered under high pressure to injection molding apparatus and the like, comprising: a. a filter housing having an inlet through which a flow of melted plastic is received, an outlet through which melted plastic may leave and a longitudinal bore of predetermined diameter formed therein, the longitudinal bore being angularly stepped down at each end thereof to first and second portions of reduced diameter; b. a rigid tubular filtering member of lesser diameter than the longitudinal bore and having a plurality of radially disposed filter openings formed therethrough, the inlet of each opening being smaller than the outlet thereof; c. the tubular filtering member being disposed in the longitudinal bore and engageably received by said first and second portions of reduced size in supporting relation thereby; d. a first flow passage establishing fluid communication between the housing inlet and outlet and defined in part by the inside of the tubulAr member; e. a second flow passage separate from the first flow passage establishing fluid communication between the housing inlet and outlet and defined in part by the filter openings and space between the tubular member and the housing; f. the first flow passage having a lesser resistance to the flow of melted plastic than the second flow passage; and g. valve means disposed in the first passage downstream of the filter openings, the valve means being movable to a filtering position for blocking the first flow passage to effect the flow of melted plastic through the second flow passage, and movable to a purge position to open said first flow passage and thereby effect the flow of melted plastic together with filter particles therethrough.
Claim 2
Dependent Claim
279 words
Apparatus for filtering melted plastic delivered under high pressure to injection molding apparatus and the like, comprising: a. a filter housing having an inlet through which a flow of melted plastic is received, an outlet through which melted plastic may leave and a longitudinal bore of predetermined diameter formed therein, the longitudinal bore being angularly stepped down at each end thereof to first and second portions of reduced diameter; b. a rigid tubular filtering member of lesser diameter than the longitudinal bore and having a plurality of radially disposed filter openings formed therethrough, the inlet of each opening being smaller than the outlet thereof; c. the tubular filtering member being disposed in the longitudinal bore and engageably received by said first and second portions of reduced size in supporting relation thereby; d. a first flow passage establishing fluid communication between the housing inlet and outlet and defined in part by the inside of the tubulAr member; e. a second flow passage separate from the first flow passage establishing fluid communication between the housing inlet and outlet and defined in part by the filter openings and space between the tubular member and the housing; f. the first flow passage having a lesser resistance to the flow of melted plastic than the second flow passage; and g. valve means disposed in the first passage downstream of the filter openings, the valve means being movable to a filtering position for blocking the first flow passage to effect the flow of melted plastic through the second flow passage, and movable to a purge position to open said first flow passage and thereby effect the flow of melted plastic together with filter particles therethrough.
Claim 3
Dependent Claim
35 words
The filtering device defined by claim 1, wherein the valve means comprises a rotatable member having a flow opening formed therein, the flow opening disposed to register with said first passage in said purge position.
Claim 4
Dependent Claim
54 words
The filtering device defined by claim 1, wherein a transverse bore is formed through the filter housing and the tubular member, and the valve member comprises a cylindrical member disposed in said transverse bore and rotatable therein, the cylindrical member having a flow opening registrable with the first flow passage in the purge position.
Claim 5
Dependent Claim
20 words
The filtering device defined by claim 3, and further comprising means for retaining the cylindrical member in a predetermined position.
Claim 6
Dependent Claim
46 words
The filtering device defined by claim 4, wherein the cylindrical member is tapered over at least a portion of its length to effect a frictional fit in the transverse bore, and the retaining means comprises means for forcing the tapered cylindrical member into the transverse bore.
Claim 7
Dependent Claim
34 words
The filtering device defined by claim 1, wherein the downstream end of the tubular member terminates in a plurality of guiding fins and streamline flow portions defining a part of the second flow passage.
Claim 8
Dependent Claim
28 words
The filtering device defined by claim 6 wherein the guiding fins and streamline flow sections are radially arranged and alternately disposed in the end of the tubular member.
Claim 9
Dependent Claim
28 words
The apparatus defined by claim 1, wherein the longitudinal bore is stepped down at an angle of 45* to the first and second portions of reduced diameter, respectively.
Claim 10
Dependent Claim
41 words
The apparatus defined by claim 1, and further comprising a collar from which the rigid filtering member projects, the collar constructed to abut the filter housing in sealing engagement therewith, and means for movably securing the collar to the filter housing.
Claim 11
Dependent Claim
27 words
The apparatus defined by claim 1, wherein the tubular filtering member is constructed for an interference fit with the respective first and second portions of reduced diameter.
Claim 12
Dependent Claim
20 words
The apparatus defined by claim 1, wherein the tubular filtering member is disposed in concentric relation with said longitudinal bore.
Claim 13
Dependent Claim
33 words
The apparatus defined by claim 1, wherein the filter openings are arranged in a plurality of circumferential rows, the openings of one row being staggered with respect to the openings of adjacent rows.
Claim 14
Dependent Claim
203 words
Apparatus for filtering melted plastic delivered under high pressure to injection molding apparatus and the like, comprising: a. a filter housing having an inlet through which a flow of melted plastic is received, an outlet through which melted plastic may leave and a longitudinal bore of predetermined diameter formed therein, the longitudinal bore being angularly stepped down at each end thereof to first and second portions of reduced diameter; b. a rigid tubular filtering member of lesser diameter than the longitudinal bore and having a plurality of radially disposed filter openings formed therethrough, the inlet of each opening being smaller than the outlet thereof; c. the tubular filtering member being disposed in the longitudinal bore and engageably received by said first and second portions of reduced diameter in supporting relation thereby so that an anNular passage is defined between the tubular member and the inner wall of the housing; d. means for establishing a smooth, streamlined flow path between said annular passage and the filter housing outlet; and e. means for normally blocking the downstream end of said tubular filtering member to effect the flow of melted plastic through said filter openings, annular passage, streamlined flow path and out the filter housing outlet.
Claim 15
Dependent Claim
203 words
Apparatus for filtering melted plastic delivered under high pressure to injection molding apparatus and the like, comprising: a. a filter housing having an inlet through which a flow of melted plastic is received, an outlet through which melted plastic may leave and a longitudinal bore of predetermined diameter formed therein, the longitudinal bore being angularly stepped down at each end thereof to first and second portions of reduced diameter; b. a rigid tubular filtering member of lesser diameter than the longitudinal bore and having a plurality of radially disposed filter openings formed therethrough, the inlet of each opening being smaller than the outlet thereof; c. the tubular filtering member being disposed in the longitudinal bore and engageably received by said first and second portions of reduced diameter in supporting relation thereby so that an anNular passage is defined between the tubular member and the inner wall of the housing; d. means for establishing a smooth, streamlined flow path between said annular passage and the filter housing outlet; and e. means for normally blocking the downstream end of said tubular filtering member to effect the flow of melted plastic through said filter openings, annular passage, streamlined flow path and out the filter housing outlet.
Claim 16
Dependent Claim
35 words
The apparatus defined by claim 13, wherein the means establishing the streamlined flow path comprises a plurality of alternating guiding fins and streamlined flow portions disposed in the downstream end of the tubular filtering member.
Claim 17
Dependent Claim
28 words
The apparatus defined by claim 13, wherein the longitudinal bore is stepped down at an angle of 45* to the first and second portions of reduced diameter, respectively.
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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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |