Patent US3836307A successfully refreshed from Google Patents.
US3836307A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Molding apparatus
Assignee: Individual
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Filing: 1973-05-11
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Granted: 1974-09-17
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Expires: 1993-05-11
Abstract
Abstract An improved apparatus for molding thermosetting material, such as strips of uncured mill rubber or other thermosetting elastomers, includes a preheater assembly which preheats the thermosetting material to a temperature which is below its curing temperature. A movable pot receives at least a portion of a charge of the preheated strip material at a loading station. The pot is then moved to a discharge or unloading station where a ram assembly is extended to force the thermosetting material from the pot into a mold. The ram assembly is then retracted and the pot is returned to the loading station. The pot is then filled so as to contain a charge which includes both preheated strip material and thermosetting material which was not forced into the mold on the previous cycle of operation. The pot is cooled at the loading station to maintain thermosetting material in the pot at a temperature below its curing or setting temperature. As the pot is being loaded, a slide block applies pressure against the mold and heats the thermosetting material in the mold to a temperature above its setting temperature.
Inventors
- 👤 D Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:45
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/02; B29C2045/027; B29C2045/028; Y; Y10; Y10S; Y10S425/00; Y10S425/051; Y10S425/228
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
361 words
An apparatus comprising a mold body having first and second mold sections which at least partially define a plurality of mold cavities, said first mold section including surface means for defining inner end portions of a plurality of spaced apart sprue passages connected in communication with said mold cavities, a movable pot for receiving a charge of material, said pot including a bottom wall defining a plurality of outlet passages and being movable between a loading position disposed to one side of said mold body and an unloading position in which said outlet passages are aligned with said sprue passages, flash limiter means for forming a thin sheet of flash material of a predetermined thickness interconnecting and circumscribing said sprue passages, said flash limiter means including a first plate disposed in abutting engagement with said bottom wall of said pot when said pot is in said unloading position, said first plate including surface means for defining a plurality of spaced apart outer end portions of said sprue passages, said outer end portions of said sprue passages being disposed in alignment with said outlet passages in said bottom wall of said pot when said pot is in said unloading position, said flash limiter means further including a second plate connected with said first plate and disposed in abutting engagement with said first mold section, said second plate including surface means for defining intermediate portions of said sprue passages, said intermediate portions of said sprue passages being disposed in alignment with said inner and outer end portions of said sprue passages, said first and second plates including first and second parallel surface means spaced a predetermined distance apart and extending between said sprue passages for defining a thin flash chamber extending between and circumscribing each of said sprue passages, and ram means cooperating with said pot when it is in the unloading position for forcing a charge of material to flow from said pot through said outlet openings into said sprue passages and from said sprue passages into said mold cavities and flash chamber to form articles in the mold cavities having projecting sprue portions interconnected by a thin sheet of flash material.
Claim 2
Independent Claim
361 words
An apparatus comprising a mold body having first and second mold sections which at least partially define a plurality of mold cavities, said first mold section including surface means for defining inner end portions of a plurality of spaced apart sprue passages connected in communication with said mold cavities, a movable pot for receiving a charge of material, said pot including a bottom wall defining a plurality of outlet passages and being movable between a loading position disposed to one side of said mold body and an unloading position in which said outlet passages are aligned with said sprue passages, flash limiter means for forming a thin sheet of flash material of a predetermined thickness interconnecting and circumscribing said sprue passages, said flash limiter means including a first plate disposed in abutting engagement with said bottom wall of said pot when said pot is in said unloading position, said first plate including surface means for defining a plurality of spaced apart outer end portions of said sprue passages, said outer end portions of said sprue passages being disposed in alignment with said outlet passages in said bottom wall of said pot when said pot is in said unloading position, said flash limiter means further including a second plate connected with said first plate and disposed in abutting engagement with said first mold section, said second plate including surface means for defining intermediate portions of said sprue passages, said intermediate portions of said sprue passages being disposed in alignment with said inner and outer end portions of said sprue passages, said first and second plates including first and second parallel surface means spaced a predetermined distance apart and extending between said sprue passages for defining a thin flash chamber extending between and circumscribing each of said sprue passages, and ram means cooperating with said pot when it is in the unloading position for forcing a charge of material to flow from said pot through said outlet openings into said sprue passages and from said sprue passages into said mold cavities and flash chamber to form articles in the mold cavities having projecting sprue portions interconnected by a thin sheet of flash material.
Claim 3
Dependent Claim
84 words
An apparatus as set forth in claim 1 further including drive means for moving said pot from said unloading position to said loading position and for simultaneously therewith sliding said bottom wall of said pot along said first plate to move said outlet passages out of alignment with said sprue passages and to at least partially block said sprue passages with said bottom wall of said pot duirng a portion of the movement of said pot from the unloading position to the loading position.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |