US3734665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary molding machine
Assignee: SECMER
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Filing: 1971-03-09
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Granted: 1973-05-22
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Expires: 1991-03-09
Abstract
Abstract This rotary molding machine designed mainly for the rotary molding of synthetic materials is also adapted to mix in a heated vessel a plurality of liquid, solid or pulverulent substances for carrying out certain heat treatments or chemical treatment by heat action, and comprises a frame structure adapted to be rotatably driven about a first transverse axis and provided with means for rotatably driving a mold about its axis, or a detachable vessel containing the material to be molded about a second axis coplanar and perpendicular to said first axis, said mold or vessel consisting of a relatively thin material adapted to be induction heated, the heating means proper consisting of an induction coil connected to a low-frequency a.c. source and secured to said frame structure, said coil consisting of connectors wound to form contiguous turns about an axis orthogonal to said first and second axes of rotation of said mold, so as to constitute a kind of sheath having a configuration homothetic to the mold configuration and bounded by two planes parallel to the plane in which the mold axes are located, whereby the mold, by approaching very closely the inner face of said coil, can easily be engaged therein or removed therefrom, and nevertheless be heated very rapidly and throughout its wall to a homogeneous temperature for melting the material contained therein or keeping said material at a predetermined temperature.
Inventors
- 👤 M Guillaud
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:59
CPC Classifications
B; B29; B29C; B29C41/00; B29C41/02; B29C41/04; B29C41/06; B29C33/00; B29C33/02; B29C33/06; B29C41/34; B29C41/46; B29C35/00; B29C35/02; B29C35/08; B29C35/0805; B29C2035/0811; Y; Y10; Y10S; Y10S425/00; Y10S425/013
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
294 words
Rotary molding machine, of the type comprising a frame structure adapted to be rotatably driven about a first transverse axis and provided with means capable of rotatably driving a mold or a detachable vessel containing the material to be molded about a second axis perpendicular to said first axis, wherein said mold or vessel consists of a material of relatively moderate thickness, adapted to be heated by induction, the heating means implemented therefor consisting of an induction coil connected to a source of low-frequency alternating current, said coil being secured to said frame structure and consisting of conductors wound with contiguous turns about an axis orthogonal to said first and second axes of rotation of said mold, so as to constitute a kind of sheath having a shape homothetic to that of said mold and bounded by two planes parallel to the plane containing said axes of rotation of said mold said mold carrying a pair of aligned, opposed coaxial trunnions adapted the one to be coupled to driving means adapted to rotate said mold and the other to engage bearing all the induction coil energizing conductors being disposed on the said side of said trunnions, the conductors of said induction coil being hollow and connected to a cooling circuit; perforations being formed in said hollow conductors and open radially towards said mold to act as nozzles for distributing jets of cooling fluid against said mold; whereby the mold, having its outer surface very close to, but not in contact with, the inner surface of said coil, can easily be fitted into or removed from said coil and nevertheless heated very rapidly and throughout its wall to a homogeneous temperature causing the material contained therein to melt or be held at a predetermined temperature.
Claim 2
Dependent Claim
294 words
Rotary molding machine, of the type comprising a frame structure adapted to be rotatably driven about a first transverse axis and provided with means capable of rotatably driving a mold or a detachable vessel containing the material to be molded about a second axis perpendicular to said first axis, wherein said mold or vessel consists of a material of relatively moderate thickness, adapted to be heated by induction, the heating means implemented therefor consisting of an induction coil connected to a source of low-frequency alternating current, said coil being secured to said frame structure and consisting of conductors wound with contiguous turns about an axis orthogonal to said first and second axes of rotation of said mold, so as to constitute a kind of sheath having a shape homothetic to that of said mold and bounded by two planes parallel to the plane containing said axes of rotation of said mold said mold carrying a pair of aligned, opposed coaxial trunnions adapted the one to be coupled to driving means adapted to rotate said mold and the other to engage bearing all the induction coil energizing conductors being disposed on the said side of said trunnions, the conductors of said induction coil being hollow and connected to a cooling circuit; perforations being formed in said hollow conductors and open radially towards said mold to act as nozzles for distributing jets of cooling fluid against said mold; whereby the mold, having its outer surface very close to, but not in contact with, the inner surface of said coil, can easily be fitted into or removed from said coil and nevertheless heated very rapidly and throughout its wall to a homogeneous temperature causing the material contained therein to melt or be held at a predetermined temperature.
Claim 3
Dependent Claim
34 words
Molding machine as set forth in claim 1, wherein said mold consists of mild steel and its wall thickness ranges from 10 to 3 mm and is preferably of the order of 5 mm.
Claim 4
Dependent Claim
35 words
Molding machine as set forth in claim 2, wherein the inner surface of said mold is coated wholly or partly with a metal having a greater thermal conductibility than the material constituting the mold proper.
Claim 5
Dependent Claim
30 words
Molding machine as set forth in claim 3, wherein the outer surface of said mold is lined wholly or partly with a coating preventing the losses of heat by convection.
Claim 6
Dependent Claim
44 words
Machine as set forth in claim 4, wherein plates of a material having a greater thermal conductibility than the mold material are disposed along portions of the outer surface of the mold which are likely to absorb more heating power than the other portions.
Claim 7
Dependent Claim
234 words
Rotary molding machine, of the type comprising a frame structure adapted to be rotatably driven about a first transverse axis and provided with means capable of rotatably driving a mold containing the material to be molded about a second axis perpendicular to said first axis, the mold Carrying a pair of aligned, opposed coaxial trunnions one adapted to be coupled to driving means adapted to rotate said mold and the other to engage a bearing, and the mold being heatable by heating means consisting of an induction coil connected to a source of low-frequency alternating current, said coil being secured to said frame structure and consisting of conductors wound with contiguous turns about an axis orthogonal to said first and second axes of rotation of said mold, so as to constitute a kind of sheath having a shape homothetic to that of said mold and bounded by two planes parallel to the plane containing said axes of rotation of said mold, all the induction coil energizing conductors being disposed on the same side of the trunnions, whereby the mold, having its outer surface very close to, but not in contact with, the inner surface of said coil, can easily be fitted into or removed from said coil and nevertheless heated very rapidly and throughout its wall to a homogeneous temperature causing the material contained therein to melt or be held at a predetermined temperature.
Claim 8
Dependent Claim
234 words
Rotary molding machine, of the type comprising a frame structure adapted to be rotatably driven about a first transverse axis and provided with means capable of rotatably driving a mold containing the material to be molded about a second axis perpendicular to said first axis, the mold Carrying a pair of aligned, opposed coaxial trunnions one adapted to be coupled to driving means adapted to rotate said mold and the other to engage a bearing, and the mold being heatable by heating means consisting of an induction coil connected to a source of low-frequency alternating current, said coil being secured to said frame structure and consisting of conductors wound with contiguous turns about an axis orthogonal to said first and second axes of rotation of said mold, so as to constitute a kind of sheath having a shape homothetic to that of said mold and bounded by two planes parallel to the plane containing said axes of rotation of said mold, all the induction coil energizing conductors being disposed on the same side of the trunnions, whereby the mold, having its outer surface very close to, but not in contact with, the inner surface of said coil, can easily be fitted into or removed from said coil and nevertheless heated very rapidly and throughout its wall to a homogeneous temperature causing the material contained therein to melt or be held at a predetermined temperature.
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) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |