US4100249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for molding a receptacle
Assignee: Scolarma
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Filing: 1976-11-26
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Granted: 1978-07-11
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Expires: 1996-11-26
Abstract
Abstract A pair of like mold parts are juxtaposed to form a mold cavity having a relatively large maximum cross-sectional size and an opening of relatively small cross-sectional size. A core is positioned in this cavity and has a body of cross-sectional size greater than that of the mold-cavity opening and having a neck extending out of the cavity through the opening and blocking this opening. A mass of hardenable material is introduced into the cavity around the core and is hardened. Thereafter the core is elastically deformed and withdrawn from inside the hardened mass whereupon the mold parts are displaced apart to demold the hardened mass.
Inventors
- 👤 Jacques Pierre Max Giron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:45
CPC Classifications
B; B28; B28B; B28B7/00; B28B7/28; B28B7/30; B28B7/303; B29; B29C; B29C33/00; B29C33/44; B29C33/48; B29C33/50; B29C33/505; B29C39/00; B29L; B29L2031/00; B29L2031/712
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
236 words
A method of molding comprising the steps of: (a) juxtaposing a pair of mold parts to form a mold cavity having a relatively large maximum cross-sectional size and having an upper opening and a lower opening of relatively small cross-sectional size forming a neck portion of the mold separated from said cavity by a shoulder; (b) positioning in said cavity a hollow core having a body of cross-sectional size greater than that of said lower opening and having a shoulder dimensioned to fit snugly against the shoulder adjacent said neck portion of the mold, a neck extending out of said cavity through said lower opening and adapted to fit snugly within said neck portion of the mold and a laterally extending portion provided at the lower end of the neck of the core adapted to abut against the lower end of the neck portion of the mold when the latter receives the core, said hollow core having an outer elastically inwardly deflectable surface of predetermined shape; (c) introducing a mass of hardenable material into said cavity from said upper opening of the mold around said core substantially without elastic deformation of the latter; (d) hardening the introduced mass; (e) temporarily elastically deforming said core and simultaneously withdrawing the same from the hardened mass; and (f) displacing said mold parts apart to demold the hardened mass and automatically elastically returning said outer surface to said predetermined shape.
Claim 2
Independent Claim
236 words
A method of molding comprising the steps of: (a) juxtaposing a pair of mold parts to form a mold cavity having a relatively large maximum cross-sectional size and having an upper opening and a lower opening of relatively small cross-sectional size forming a neck portion of the mold separated from said cavity by a shoulder; (b) positioning in said cavity a hollow core having a body of cross-sectional size greater than that of said lower opening and having a shoulder dimensioned to fit snugly against the shoulder adjacent said neck portion of the mold, a neck extending out of said cavity through said lower opening and adapted to fit snugly within said neck portion of the mold and a laterally extending portion provided at the lower end of the neck of the core adapted to abut against the lower end of the neck portion of the mold when the latter receives the core, said hollow core having an outer elastically inwardly deflectable surface of predetermined shape; (c) introducing a mass of hardenable material into said cavity from said upper opening of the mold around said core substantially without elastic deformation of the latter; (d) hardening the introduced mass; (e) temporarily elastically deforming said core and simultaneously withdrawing the same from the hardened mass; and (f) displacing said mold parts apart to demold the hardened mass and automatically elastically returning said outer surface to said predetermined shape.
Claim 3
Dependent Claim
27 words
The method defined in claim 1, wherein said body is withdrawn in step (e) through said opening before the displacement of said mold parts of step (f).
Claim 4
Dependent Claim
23 words
The method defined in claim 1; further comprising the step of blocking said opening completely with said neck during steps (c) and (d).
Claim 5
Dependent Claim
20 words
The method defined in claim 1; further comprising the step of clamping said parts together during steps (c) and (d).
Claim 6
Dependent Claim
37 words
The method defined in claim 1; further comprising the step of orienting said parts with said upper opening at the bottom of said cavity, said core being withdrawn in step (e) downwardly out of said hardened mass.
Claim 7
Dependent Claim
171 words
A molding apparatus comprising: a pair of mold parts juxtaposable to form a mold cavity of a relatively large maximum cross-sectional size having an upper opening and a lower opening of relatively small cross-sectional size and forming a neck portion of the mold separated from said cavity by a shoulder; a hollow mold core having a body part of a cross-sectional size greater than said lower opening and having a shoulder dimensioned to fit snugly against the shoulder adjacent said neck portion of the mold, a neck extending out of said cavity through said lower opening and adapted to fit snugly within said neck portion of the mold and a laterally extending portion provided at the lower end of the neck portion of the mold when the latter receives the core, said hollow core being fittable within said mold and said body being elastically inwardly compressible to a cross-sectional size at most as great as that of said lower opening, said body having an outer surface defining normally a predetermined shape.
Claim 8
Dependent Claim
171 words
A molding apparatus comprising: a pair of mold parts juxtaposable to form a mold cavity of a relatively large maximum cross-sectional size having an upper opening and a lower opening of relatively small cross-sectional size and forming a neck portion of the mold separated from said cavity by a shoulder; a hollow mold core having a body part of a cross-sectional size greater than said lower opening and having a shoulder dimensioned to fit snugly against the shoulder adjacent said neck portion of the mold, a neck extending out of said cavity through said lower opening and adapted to fit snugly within said neck portion of the mold and a laterally extending portion provided at the lower end of the neck portion of the mold when the latter receives the core, said hollow core being fittable within said mold and said body being elastically inwardly compressible to a cross-sectional size at most as great as that of said lower opening, said body having an outer surface defining normally a predetermined shape.
Claim 9
Dependent Claim
16 words
The apparatus defined in claim 6, wherein said core is unitarily formed of elastically deformable material.
Claim 10
Dependent Claim
46 words
The apparatus defined in claim 6, wherein said mold parts are complementary mold halves joinable along a parting plane, said halves each having outwardly directed tabs at said plane, said apparatus furhter comprising clips engageable over the tabs of juxtaposed halves to hold said halves together.
Claim 11
Dependent Claim
32 words
The apparatus defined in claim 6; further comprising clamping means including laterally projecting tabs on said mold parts and clips engageable thereover for holding said mold parts together at their upper region.
Claim 12
Dependent Claim
43 words
The apparatus as defined in claim 6, further comprising a mold base having two pairs of upstanding tabs adapted to embrace corresponding projections formed on the neck portion of the mold, so as to hold the mold parts together at their lower region.
References Cited (Backward Citations)
US720718A
Cited
US1698836A
Cited
US2392561A
Cited
US3136831A
Cited
US3120028A
Cited
US3355772A
Cited
US3345438A
Cited
US3622117A
Cited
US3815863A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-10 | 1982-01-09 | 1982-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-10 | 1986-01-09 | 1986-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-10 | 1990-01-09 | 1990-07-11 | $7700.00 | Window Closed / Lapsed |