Patent US3687413A successfully refreshed from Google Patents.
US3687413A
Expired / Lapsed
US
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Fabrication of plastic spinnerettes by means of stacked mandrels
Assignee: Wyeth Holdings LLC
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Filing: 1969-12-15
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Granted: 1972-08-29
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Expires: 1989-12-15
Abstract
Abstract The disclosed molding apparatus includes a plurality of mandrels, each in the form of a comb having spaced, parallel teeth, assembled into a mandrel stack. The mandrel stack is supported above a mold cavity into which the teeth extend. A plastic resin is poured into the mold and cured, and the mandrel stack is separated from the mold cavity to withdraw the teeth uniformly from the resulting casting. The holes left in one surface of the casting are filled with a grouting material, and the casting machined to form a finished spinnerette having shaped orifices.
Inventors
- 👤 Donald Murfitt
- 👤 James Bruce Peeso Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:54
CPC Classifications
B; B29; B29C; B29C33/00; B29C33/0033; D; D01; D01D; D01D4/00; D01D4/02; D01D4/022; Y; Y10; Y10S; Y10S425/00; Y10S425/805
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
222 words
A mandrel stack assembly for use as part of a casting apparatus for casting spinnerette blanks comprising, in combination, A. a plurality of comb-like mandrel units, each such mandrel unit comprising a thin, substantially planar backbone to which are affixed a plurality of tooth-like core elements disposed in a single row along an edge of and in the same plane as said backbone, each of said tooth-like core elements having a maximum thickness identical to the thickness of said thin, substantially planar backbone and being spaced from and substantially parallel to all the others of said tooth-like core elements, said substantially planar backbone being less than about 0.04 inches thick; B. a plurality of spacer units, each such spacer unit comprising a thin, substantially planar member; C. the backbones of said comb-like mandrels and the planar members of said spacer units each being provided with means for mounting and aligning a plurality of said comb-like mandrels and said spacer units in a mandrel stack with the comb-like teeth of said mandrels extending freely beyond the limits of said spacer units; and D. means for securing together as a stack assembly said plurality of comb-like mandrel units and said plurality of spacer units; E. said stack assembly having at least one such spacer unit disposed between the backbones of adjacent comb-like mandrel units.
Claim 2
Dependent Claim
222 words
A mandrel stack assembly for use as part of a casting apparatus for casting spinnerette blanks comprising, in combination, A. a plurality of comb-like mandrel units, each such mandrel unit comprising a thin, substantially planar backbone to which are affixed a plurality of tooth-like core elements disposed in a single row along an edge of and in the same plane as said backbone, each of said tooth-like core elements having a maximum thickness identical to the thickness of said thin, substantially planar backbone and being spaced from and substantially parallel to all the others of said tooth-like core elements, said substantially planar backbone being less than about 0.04 inches thick; B. a plurality of spacer units, each such spacer unit comprising a thin, substantially planar member; C. the backbones of said comb-like mandrels and the planar members of said spacer units each being provided with means for mounting and aligning a plurality of said comb-like mandrels and said spacer units in a mandrel stack with the comb-like teeth of said mandrels extending freely beyond the limits of said spacer units; and D. means for securing together as a stack assembly said plurality of comb-like mandrel units and said plurality of spacer units; E. said stack assembly having at least one such spacer unit disposed between the backbones of adjacent comb-like mandrel units.
Claim 3
Dependent Claim
67 words
A mandrel stack assembly as defined in claim 1 wherein said means for mounting and aligning said comb-like mandrels and said spacer units comprises a plurality of holes therethrough and wherein said means for securing them together as a stack assembly comprises a pair of clamp blocks and a plurality of clamp rods which pass through the aforesaid holes through said comb-like mandrels and said spacer units.
Claim 4
Dependent Claim
109 words
A mandrel stack assembly as defined in claim 2 including a jack mechanism comprising a jack spacer and a thrust bar, said jack spacer comprising an elongated bar provided with a plurality of holes through which pass said plurality of clamp rods and a plurality of jack screws extending transversely through said elongated bar parallel to said tooth-like core elements, said thrust bar being immediately adjacent said jack spacer in contact with the ends of said jack screws, said jack mechanism serving to withdraw said tooth-like core elements from a cast spinnerette blank when said jack screws are tightened against said thrust bar which presses against said cast blank.
Claim 5
Dependent Claim
110 words
A mandrel stack assembly as defined in claim 1 wherein said means for mounting anD aligning said comb-like mandrels and said spacer units comprises notches in the backbones of said comb-like mandrels and in said spacer units and wherein said means for securing them together as a stack assembly comprises a head block provided with an annular channel of dimensions corresponding to the dimensions of the backbones of said comb-like mandrels and of said spacer units, said head block being provided with annular flanges within said annular channel located and dimensioned to fit within said notches when said comb-like mandrels and said spacer units are located in said head block.
Claim 6
Dependent Claim
26 words
A mandrel stack assembly as defined in claim 4 also including a plurality of half spacers disposed within said annular channel adjacent the larger circumference thereof.
Claim 7
Dependent Claim
42 words
A mandrel stack assembly as defined in claim 1 in combination with a mold having a cavity into which a castable material can be introduced wherein said mandrel stack assembly is disposed so said tooth-like core elements extend into said mold cavity.
Claim 8
Dependent Claim
66 words
A mandrel stack assembly as defined in claim 3 in combination with a mold having a cavity into which a castable material can be introduced wherein said mandrel stack assembly is disposed so said tooth-like core elements extend into said mold cavity and so a side of said thrust bar remote from where said jack screws contact it forms a portion of the mold cavity wall.
Claim 9
Dependent Claim
44 words
A mandrel stack assembly as defined in claim 4 in combination with a mold having a generally annular cavity into which a castable material can be introduced wherein said mandrel stack assembly is disposed so said tooth-like core elements extend into said mold cavity.
Claim 10
Dependent Claim
49 words
A mandrel stack assembly in combination with a mold as defined in claim 8 wherein said mandrel stack assembly is provided with a plurality of jack screws extending therethrough parallel to said tooth-like core elements, the ends of said jack screws bearing against said mold outside said annular cavity.
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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) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |