US3844337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pouring sprue
Assignee: Packaging Corp of America
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Filing: 1972-12-18
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Granted: 1974-10-29
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Expires: 1992-12-18
Abstract
Abstract A pouring sprue is provided which is adapted to be used in a variety of foundry casting operations. The sprue is of unitary construction and is capable of disintegrating when subjected to a predetermined temperature for a finite period of time without an undesirable residue being formed. Prior to being used, the sprue may be readily nested with sprues of like configuration so as to form a compact stack for storage or shipment. The sprue includes a pair of elongated complemental sections which are integrally connected along one elongated side and foldable relative to one another to a closed position forming a funnel member. The opposite elongated side of each section is provided with complemental locking means. The complemental locking means of the sections interlock with one another and retain the sections in closed relation. The interlocked elongated sides of the sections are provided with seal means which form a sealed joint between the interlocked sections.
Inventors
- 👤 C Bessett
- 👤 J Boyd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:22
CPC Classifications
B; B22; B22C; B22C9/00; B22C9/08; B22C9/082
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
177 words
A pouring sprue of unitary construction for molten metal or the like, comprising a pair of elongated complemental sections, each section having a recessed center portion and an elongated first side portion extending from said center portion and being integral with and foldably connected to a corresponding elongated first side portion of the other section, said sections, when folded to a closed position having the center portions thereof forming an elongated funnel having an inlet opening at one end and an outlet opening at the opposite end; complemental locking means on corresponding elongated second side portions of said sections and adapted to lock said sections in said closed position, the first and second side portions of a section being separated by the center portion thereof; and seal means formed on said sections adjacent said complemental locking means and extending longitudinally of said sections and effecting a continuous sealed joint between the elongated side portions of said sections when the latter are locked in said closed position, said sealed joint extending substantially the entire length of said funnel.
Claim 2
Dependent Claim
177 words
A pouring sprue of unitary construction for molten metal or the like, comprising a pair of elongated complemental sections, each section having a recessed center portion and an elongated first side portion extending from said center portion and being integral with and foldably connected to a corresponding elongated first side portion of the other section, said sections, when folded to a closed position having the center portions thereof forming an elongated funnel having an inlet opening at one end and an outlet opening at the opposite end; complemental locking means on corresponding elongated second side portions of said sections and adapted to lock said sections in said closed position, the first and second side portions of a section being separated by the center portion thereof; and seal means formed on said sections adjacent said complemental locking means and extending longitudinally of said sections and effecting a continuous sealed joint between the elongated side portions of said sections when the latter are locked in said closed position, said sealed joint extending substantially the entire length of said funnel.
Claim 3
Dependent Claim
91 words
The pouring sprue of claim 1 wherein said seal means includes an elongated male portion formed on one section and disPosed adjacent to and coextensive with the juncture of the second side portion and the center portion of the one section, and an elongated female portion formed on the other section and disposed adjacent to and coextensive with the juncture of the second side portion and the center portion of the other section, said male and female portions form a sealed joint located intermediate the complemental locking means and the funnel.
Claim 4
Dependent Claim
82 words
The pouring sprue of claim 1 wherein the complemental locking means on one section comprises a plurality of longitudinally spaced tabs formed along the elongated second side portion of the one section, and the complemental locking means on the other section comprises a plurality of longitudinally spaced slots formed along the elongated second side portion of the other section, said slots being aligned with said tabs and sized relative thereto for interlockingly receiving said tabs when said sections assume a closed position.
Claim 5
Dependent Claim
33 words
The pouring sprue of claim 1 wherein said pair of complemental sections is formed of a gas-pervious material capable of disintegrating after being subjected to a predetermined temperature for a finite time period.
Claim 6
Dependent Claim
55 words
The pouring sprue of claim 4 wherein same is of molded pulp material and the sections of said sprue are adapted to normally assume a fully open position wherein the center portions of said sections are disposed in side-by-side relation and the corresponding open sides of the center portions face in substantially the same direction.
Claim 7
Dependent Claim
18 words
The pouring sprue of claim 1 wherein the center portions of the complemental sections are of like configuration.
Claim 8
Dependent Claim
58 words
The pouring sprue of claim 3 wherein each locking tab is of substantial wedge configuration and having a narrow neck portion connected to the second side portion of one section, and each slot of the other section is dimensioned to accommodate only the narrow neck portion of a corresponding tab when said sections are in a closed position.
Claim 9
Dependent Claim
98 words
The pouring sprue of claim 1 wherein the complemental locking means formed on one section comprises a first set of longitudinally spaced open end first slits, each slit of the first set extending obliquely outwardly, and the complemental locking means formed on the other section comprises a second set of longitudinally spaced open end slits, each slit of the second set extending outwardly at a different angle than that of said first sets of slits whereby the first and second sets of slits interengage each other in interlocking relation and retain said sprue sections in a closed position.
Claim 10
Dependent Claim
46 words
The pouring sprue of claim 1 wherein the center portion of at least one complemental section is provided with an elongated protuberance extending longitudinally of said center portion and projecting into the funnel formed by said center portions when said sections are in a closed position.
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) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |