US3726626A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Molding apparatus
Assignee: Individual
•
Filing: 1971-10-29
•
Granted: 1973-04-10
•
Expires: 1991-10-29
Abstract
Abstract An automatic molding apparatus for plastic thermosetting material. The apparatus has five or less mold cavities for easy manufacture of the molds or easy alteration thereof. A hopper is filled with a plastic powder and an automatic feed device moves a predetermined quantity of the powder to each mold cavity. The molds then close automatically and heat is applied. Each cavity may be provided with a mold insert which can be threaded to form internal threads in the finished piece. Automatic means are provided to rotate the finished piece to remove it from the threaded insert.
Inventors
- 👤 H Bromberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:13
CPC Classifications
B; B29; B29C; B29C31/00; B29C31/04; B29C31/06; B29C31/065; B29C31/066; B29C37/00; B29C37/0003; B29C37/0007; B29C37/0017; B29C37/0021; B29C43/00; B29C43/02; B29C43/32; B29C43/34; B29D; B29D1/00; B29C33/00; B29C33/0022; B29K; B29K2105/00; B29K2105/25; B29K2105/251
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
110 words
A molding machine for thermosetting material comprising a base, spaced vertical supports mounted on said base, an upper rectangular block mounted between said supports, said block having a plurality of aligned upper mold cavities, a lower rectangular block mounted below said upper block, said lower block having a plurality of mold cavities in vertical alignment with said upper mold cavities, means for feeding thermosetting material into said lower mold cavities, means for raising said lower block against said upper block Under pressure, means for heating said blocks, said raising means lowering said lower block after a predetermined molding period, and means for removing the completed articles from said mold cavities.
Claim 2
Dependent Claim
110 words
A molding machine for thermosetting material comprising a base, spaced vertical supports mounted on said base, an upper rectangular block mounted between said supports, said block having a plurality of aligned upper mold cavities, a lower rectangular block mounted below said upper block, said lower block having a plurality of mold cavities in vertical alignment with said upper mold cavities, means for feeding thermosetting material into said lower mold cavities, means for raising said lower block against said upper block Under pressure, means for heating said blocks, said raising means lowering said lower block after a predetermined molding period, and means for removing the completed articles from said mold cavities.
Claim 3
Dependent Claim
25 words
A molding machine as in claim 1, wherein said material feeding means feeds a predetermined quantity of the thermosetting material to each lower mold cavity.
Claim 4
Dependent Claim
40 words
A molding machine as in claim 1, wherein said feeding means includes an auxiliary base portion extending from said base, a horizontal rectangular frame having supporting wheels riding on said auxiliary base, and a hopper feed mounted on said frame.
Claim 5
Dependent Claim
25 words
A molding machine as in claim 1, wherein each mold and its associated mold feed may be disconnected to reduce the number of working cavities.
Claim 6
Dependent Claim
20 words
A molding machine as in claim 1, wherein means are provided for cleaning said mold cavities of excess mold material.
Claim 7
Dependent Claim
45 words
A molding machine as in claim 5, wherein said cleaning means comprises a pair of air nozzles aimed at each upper and lower mold cavity, said nozzles being carried by said removal means to blow jets of air on said molds after the molding cycle.
Claim 8
Dependent Claim
27 words
A molding machine as in claim 1, wherein said upper mold cavities are provided with mold inserts for forming the interior of the articles to be molded.
Claim 9
Dependent Claim
60 words
A molding machine as in claim 7, wherein said upper mold cavities are provided with central openings, a vertical rod extending through each opening, said inserts being mounted on the lower end of each rod, the upper rod ends being supported in a horizontal plate, and a pair of spaced rods extending from said lower block to support said plate.
Claim 10
Dependent Claim
67 words
A molding machine as in claim 8, wherein said removal means includes spaced horizontal supports, a frame slidably mounted on said supports, a plurality of friction wheels mounted at the front edge of said frame, each wheel being in alignment with one of said mold cavities, and means for rotating said wheels when said frame is moved inwardly to remove the molded articles from said mold machine.
Claim 11
Dependent Claim
20 words
A molding machine as in claim 9, wherein means are provided for cleaning said mold cavity of excess mold material.
Claim 12
Dependent Claim
45 words
A molding machine as in claim 1, wherein said upper mold cavities are provided with externally threaded mold inserts for forming a threaded interior in the articles being molded, said removing means unthreading the finished articles from said inserts after separation of said mold blocks.
Claim 13
Dependent Claim
29 words
A molding machine as in claim 1, wherein said material feeding means is adjustable to provide a predetermined quantity of thermosetting material to each of said lower mold cavities.
Claim 14
Dependent Claim
81 words
A molding machine as in claim 12, wherein said adjustable feeding means comprises a rectangular block having a horizontal slot, a plate slidable in said slot, said plate having an adjustable opening for each mold cavity, a vertical opening in said block over each opening, said thermosetting material being fed through said vertical openings to fill said adjustable openings, and means for sliding said plate over said lower mold cavities, whereby said material will fill from said plate into said cavities.
Claim 15
Dependent Claim
51 words
A molding machine as in claim 13, wherein said feeding means includes an auxiliary base portion extending from said base, a horizontal rectangular frame having supporting wheels riding on said auxiliary base, and a hopper feed mounted on said frame, said hopper feeding the thermosetting material to said vertical block openings.
Claim 16
Dependent Claim
66 words
A molding machine as in claim 1, wherein said removal means includes spaced horizontal supports, a frame slidably mounted on said supports, a plurality of friction wheels mounted at the front edge of said frame, each wheel being in alignment with one of said mold cavities, and means for rotating said wheels when said frame is moved inwardly to remove the molded articles from said mold.
Claim 17
Dependent Claim
24 words
A molding machine as in claim 15, wherein said material feeding means feeds a predetermined quantity of thermosetting material to each lower mOld cavity.
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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) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |