US3985176A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unitary pattern assembly method
Assignee: RTX Corp
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Filing: 1976-01-05
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Granted: 1976-10-12
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Expires: 1996-01-05
Abstract
Abstract This invention involves a method of making a unitary pattern assembly which is useful in forming an investment shell mold having an integral base for the conventional and directional solidification of molten metals and alloys. It comprises providing a yoke having a pattern capturing means and two leg members, providing a mold structure having a cavity comprising a pattern section and base section, positioning the mold structure and yoke to expose the capturing means and leg members to the pattern section and base section, respectively, forming a pattern having a base integral therewith in the cavity and removing the mold structure from the pattern and integral base. A unitary pattern assembly comprising a yoke and pattern, having an integral base, fixedly captured therein is obtained. The method is especially suitable for making a pattern assembly useful in the production of gas turbine engine blades by the "lost wax" process.
Inventors
- 👤 Douglas Merrill Wamester
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:37
CPC Classifications
B; B22; B22C; B22C7/00; B22C7/02; B22C9/00; B22C9/02; B22C9/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
184 words
A method of making a unitary pattern assembly useful in forming an investment shell mold having an integral base, for the conventional and directional solidification of molten metals and alloys comprising the steps of: a. providing a yoke, said yoke comprising a support member having two leg members extending therefrom to a distance at least equal to the length of the pattern and thickness of the base to be formed and having thereon pattern capturing means interposed between said leg members; b. providing a mold structure, said structure having a cavity comprising a pattern section and base section; c. positioning the mold structure and yoke to expose said pattern capturing means to the pattern section and said leg members to the base section of the cavity; d. forming a pattern having a base integral therewith in said cavity, said pattern being fixedly captured at its end by said pattern capturing means and said base being fixedly captured by said leg members; and e. removing the mold structure from the pattern and integral base, said pattern and integral base remaining fixedly captured in the yoke.
Claim 2
Independent Claim
184 words
A method of making a unitary pattern assembly useful in forming an investment shell mold having an integral base, for the conventional and directional solidification of molten metals and alloys comprising the steps of: a. providing a yoke, said yoke comprising a support member having two leg members extending therefrom to a distance at least equal to the length of the pattern and thickness of the base to be formed and having thereon pattern capturing means interposed between said leg members; b. providing a mold structure, said structure having a cavity comprising a pattern section and base section; c. positioning the mold structure and yoke to expose said pattern capturing means to the pattern section and said leg members to the base section of the cavity; d. forming a pattern having a base integral therewith in said cavity, said pattern being fixedly captured at its end by said pattern capturing means and said base being fixedly captured by said leg members; and e. removing the mold structure from the pattern and integral base, said pattern and integral base remaining fixedly captured in the yoke.
Claim 3
Dependent Claim
28 words
The method of claim 1 wherein said pattern capturing means is an elongated member extending from the support member along the axis of the pattern to be formed.
Claim 4
Dependent Claim
16 words
The method of claim 2 wherein said member is in the shape of a finned cylinder.
Claim 5
Dependent Claim
20 words
The method of claim 1 wherein said pattern capturing means is provided by said support member having a recess therein.
Claim 6
Dependent Claim
19 words
The method of claim 1 wherein said leg members project at substantially a 90° angle from said support member.
Claim 7
Dependent Claim
13 words
The method of claim 1 wherein said yoke is provided with handle means.
Claim 8
Dependent Claim
16 words
The method of claim 6 wherein said handle means is adapted to engage a manipulating device.
Claim 9
Dependent Claim
23 words
The method of claim 1 wherein the pattern section of said cavity is substantially in the shape of a gas turbine engine blade.
Claim 10
Dependent Claim
25 words
The method of claim 1 wherein an insert is placed in the pattern section of the cavity prior to forming the pattern and integral base.
Claim 11
Dependent Claim
20 words
The method of claim 1 wherein the pattern and integral base are formed from molten wax injected into the cavity.
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) | 1979-10-12 | 1980-04-12 | 1980-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-12 | 1984-04-12 | 1984-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-12 | 1988-04-12 | 1988-10-12 | $7700.00 | Window Closed / Lapsed |