US3703348A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for molding hollow objects from thermoplastic materials
Assignee: Rototron Corp
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Filing: 1970-10-27
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Granted: 1972-11-21
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Expires: 1990-10-27
Abstract
Abstract Apparatus is provided for molding thermoplastic articles in hollow form in which a frame or stand is provided which has two stable positions. These are selectively employed to hold a mold in inclined or horizontal attitudes, the mold being provided with an open end on which is placed a cover with an opening therein so that access to the interior of the mold is possible. Thermoplastic material is placed in the mold which is heated so that the material fuses to the mold and the article is thereby formed. Access to the interior of the mold permits improved control over the formation of the objects being molded and permits various possibilities such as forming articles with stripes therein or with mechanical parts incorporated into the object.
Inventors
- 👤 Stewart Pivar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:07
CPC Classifications
B; B29; B29C; B29C41/00; B29C41/02; B29C41/04; B29C41/042
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
130 words
Apparatus for molding hollow objects comprising a mold, drive means for rotating said mold about an axis, support means adapted for resting on a flat surface and having two stable positions of equilibrium to position the said axis sequentially and selectively in inclined and generally horizontal attitudes for extended periods of time, said support means including lower edge means for pivoting said apparatus between two said stable positions of equilibrium and brace structure means, said apparatus having a center of gravity adapted to be positioned on opposite sides of said edge means, said brace structure means supporting said apparatus with said center of gravity on one side of said edge means with said axis in said inclined attitude, and a heat source fixed relative to the axis of said mold.
Claim 2
Dependent Claim
130 words
Apparatus for molding hollow objects comprising a mold, drive means for rotating said mold about an axis, support means adapted for resting on a flat surface and having two stable positions of equilibrium to position the said axis sequentially and selectively in inclined and generally horizontal attitudes for extended periods of time, said support means including lower edge means for pivoting said apparatus between two said stable positions of equilibrium and brace structure means, said apparatus having a center of gravity adapted to be positioned on opposite sides of said edge means, said brace structure means supporting said apparatus with said center of gravity on one side of said edge means with said axis in said inclined attitude, and a heat source fixed relative to the axis of said mold.
Claim 3
Dependent Claim
130 words
Apparatus for molding hollow objects comprising a mold, drive means for rotating said mold about an axis, support means adapted for resting on a flat surface and having two stable positions of equilibrium to position the said axis sequentially and selectively in inclined and generally horizontal attitudes for extended periods of time, said support means including lower edge means for pivoting said apparatus between two said stable positions of equilibrium and brace structure means, said apparatus having a center of gravity adapted to be positioned on opposite sides of said edge means, said brace structure means supporting said apparatus with said center of gravity on one side of said edge means with said axis in said inclined attitude, and a heat source fixed relative to the axis of said mold.
Claim 4
Dependent Claim
130 words
Apparatus for molding hollow objects comprising a mold, drive means for rotating said mold about an axis, support means adapted for resting on a flat surface and having two stable positions of equilibrium to position the said axis sequentially and selectively in inclined and generally horizontal attitudes for extended periods of time, said support means including lower edge means for pivoting said apparatus between two said stable positions of equilibrium and brace structure means, said apparatus having a center of gravity adapted to be positioned on opposite sides of said edge means, said brace structure means supporting said apparatus with said center of gravity on one side of said edge means with said axis in said inclined attitude, and a heat source fixed relative to the axis of said mold.
Claim 5
Dependent Claim
68 words
Apparatus as claimed in claim 1 wherein said mold includes a cylindrical body with an open end and a bottom and a cover detachably engageable with said body at said open end, said cover having an open central portion to permit visual access into said mold and including a rim portion concentrically disposed around said open end to retain material in the mold when the axis is horizontal.
Claim 6
Dependent Claim
144 words
Apparatus for molding hollow objects comprising a mold, drive means for rotating said mold about an axis, and support means adapted for resting on a flat surface and having two stable positions of equilibrium to position the said axis sequentially and selectively in inclined and generally horizontal attitudes for extended periods of time, said mold including a cylindrical body with an open end and a bottom and a cover detachably engageable with said body at said open end, said cover having an open central portion to permit visual access into said mold and including a riM portion concentrically disposed around said open end to retain material in the mold when the axis is horizontal, the cover including a diametral part extending across said opening, said drive means including elements axially straddling said mold and coupled in driving relationship with said bottom and diametral part.
Claim 7
Dependent Claim
144 words
Apparatus for molding hollow objects comprising a mold, drive means for rotating said mold about an axis, and support means adapted for resting on a flat surface and having two stable positions of equilibrium to position the said axis sequentially and selectively in inclined and generally horizontal attitudes for extended periods of time, said mold including a cylindrical body with an open end and a bottom and a cover detachably engageable with said body at said open end, said cover having an open central portion to permit visual access into said mold and including a riM portion concentrically disposed around said open end to retain material in the mold when the axis is horizontal, the cover including a diametral part extending across said opening, said drive means including elements axially straddling said mold and coupled in driving relationship with said bottom and diametral part.
Claim 8
Dependent Claim
25 words
Apparatus as claimed in claim 3 wherein said support means is a stand having two stable positions, said drive means being mounted on said stand.
Claim 9
Dependent Claim
16 words
Apparatus as claimed in claim 4 comprising a burner mounted on said stand and displaceable therewith.
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) | 1975-11-21 | 1976-05-22 | 1976-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-21 | 1980-05-22 | 1980-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-21 | 1984-05-22 | 1984-11-21 | $7700.00 | Window Closed / Lapsed |