US3826477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Injection molding machine with a venting device
Assignee: Meiki Seisakusho KK
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Filing: 1972-04-10
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Granted: 1974-07-30
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Expires: 1992-04-10
Abstract
Abstract An injection molding machine having a vent opening on the heating barrel is disclosed which eliminates the clogging of the vent opening by the melt. This is attached by a step or steps in the size of the outer diameter of the screw and also steps in the size of the inner diameter of the barrel. The larger diameter portion of the barrel is located forwardly of the smaller diameter portion. The same is true of the screw. The vent opening is located in the portion of the device with a large barrel diameter but a small screw diameter.
Inventors
- 👤 M Kunogi
- 👤 T Tanikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:49
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/46; B29C45/58; B29C45/47; B29C45/50; B29C45/62; B29C45/63; B29C45/60; B29C2045/605
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
191 words
An injection molding machine having a front end through which the material to be molded is injected into a mold and a rear end through which the material to be molded is fed to the injection molding machine comprising: a heating barrel having two sections having different inner diameters, the larger inner diameter being at the front end and the smaller inner diameter being at the rear end; a screw having a screw thread of a single pitch and having two sections having different outer thread diameters said larger thread diameter being at the front end and entirely within said larger inner diameter section of said barrel and the smaller thread diameter being at the rear end and overlapping the portion of said barrel between said larger and smaller inner diameter sections, said screw being fitted rotatably and reciprocably within said barrel; an opening located through the section of said barrel having a larger inner diameter which surrounds the section of said screw having a smaller thread diameter for venting gases from material being injection molded passing through said barrel; means for rotating said screw; and means for reciprocating said screw.
Claim 2
Dependent Claim
191 words
An injection molding machine having a front end through which the material to be molded is injected into a mold and a rear end through which the material to be molded is fed to the injection molding machine comprising: a heating barrel having two sections having different inner diameters, the larger inner diameter being at the front end and the smaller inner diameter being at the rear end; a screw having a screw thread of a single pitch and having two sections having different outer thread diameters said larger thread diameter being at the front end and entirely within said larger inner diameter section of said barrel and the smaller thread diameter being at the rear end and overlapping the portion of said barrel between said larger and smaller inner diameter sections, said screw being fitted rotatably and reciprocably within said barrel; an opening located through the section of said barrel having a larger inner diameter which surrounds the section of said screw having a smaller thread diameter for venting gases from material being injection molded passing through said barrel; means for rotating said screw; and means for reciprocating said screw.
Claim 3
Dependent Claim
232 words
An injection molding machine having a front end through which the material to be molded is injected into a mold and a rear end through which the material to be molded is fed to the injection molding machine, comprising: a heating barrel having at least two sections having different inner diameters, the larger inner diameter being at the front end and the smaller inner diameter being at the rear end; a screw having a screw thread of a single pitch and having at least two sections having different outer thread diameters and three sections having different root diameters, said larger thread diameter being at the front end and the smaller thread diameter being at the rear end, and wherein the largest of said root diameters is at the end of said screw which has the larger outer thread diameter, the middle diameter root is at the other end of said screw which has the smaller outer thread diameter and the smallest of said root diameters is located between the other two root diameters and overlapping the sections of said screw having differing outer thread diameters said screw being fitted rotatably and reciprocably within said barrel; an opening located through the section of said barrel having a larger inner diameter for venting gases from material being injection molded passing through said barrel; means for rotating said screw; and means for reciprocating said screw.
Claim 4
Dependent Claim
232 words
An injection molding machine having a front end through which the material to be molded is injected into a mold and a rear end through which the material to be molded is fed to the injection molding machine, comprising: a heating barrel having at least two sections having different inner diameters, the larger inner diameter being at the front end and the smaller inner diameter being at the rear end; a screw having a screw thread of a single pitch and having at least two sections having different outer thread diameters and three sections having different root diameters, said larger thread diameter being at the front end and the smaller thread diameter being at the rear end, and wherein the largest of said root diameters is at the end of said screw which has the larger outer thread diameter, the middle diameter root is at the other end of said screw which has the smaller outer thread diameter and the smallest of said root diameters is located between the other two root diameters and overlapping the sections of said screw having differing outer thread diameters said screw being fitted rotatably and reciprocably within said barrel; an opening located through the section of said barrel having a larger inner diameter for venting gases from material being injection molded passing through said barrel; means for rotating said screw; and means for reciprocating said screw.
Claim 5
Dependent Claim
28 words
An injection molding machine in accordance with claim 2 wherein: said opening is located in said barrel at that section of said screw having the smallest root diameter.
Claim 6
Dependent Claim
190 words
An injection molding machine having a front end through which the material to be molded is injected into a mold and a rear end through which the material to be molded is fed to the injection molding machine, comprising: a heating barrel having three sections having different inner diameters, the largest inner diameter being at the front end and the smallest inner diameter being at the rear end; a screw having a screw thread of a single pitch and having three sections having different outer thread diameters and three sections having different root diameters, the largest thread diameter being at the front end and the smallest thread diameter at the read end, and wherein the largest of said root diameters is at the front end, the middle diameter root is at the rear end and the smallest of said root diameters is therebetween, said screw being fitted rotatably and reciprocably within said barrel; an opening located through the section of said barrel having A larger inner diameter for venting gases from material being injection molded passing through said barrel; means for rotating said screw; and means for reciprocating said screw.
Claim 7
Dependent Claim
190 words
An injection molding machine having a front end through which the material to be molded is injected into a mold and a rear end through which the material to be molded is fed to the injection molding machine, comprising: a heating barrel having three sections having different inner diameters, the largest inner diameter being at the front end and the smallest inner diameter being at the rear end; a screw having a screw thread of a single pitch and having three sections having different outer thread diameters and three sections having different root diameters, the largest thread diameter being at the front end and the smallest thread diameter at the read end, and wherein the largest of said root diameters is at the front end, the middle diameter root is at the rear end and the smallest of said root diameters is therebetween, said screw being fitted rotatably and reciprocably within said barrel; an opening located through the section of said barrel having A larger inner diameter for venting gases from material being injection molded passing through said barrel; means for rotating said screw; and means for reciprocating said screw.
Claim 8
Dependent Claim
28 words
An injection molding machine in accordance with claim 4 wherein: said opening is located in said barrel at that section of said screw having the smallest root diameter.
Claim 9
Dependent Claim
80 words
An injection molding machine in accordance with claim 4 wherein: the sections of said screw of differing root diameters at the front, middle and rear of said screw, correspond to the sections of said screw of differing outer diameter and wherein the section of said screw having the smallest root diameter overlaps the largest and middle sections of said barrel and the section of said screw having the smallest outer diameter overlaps the middle and smallest sections of said barrel.
References Cited (Backward Citations)
US2595455A
Cited
US3263276A
Cited
US3193877A
Cited
FR1432146A
Cited
US3633880A
Cited
US3685804A
Cited
US3737151A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-29 | 1978-01-28 | 1978-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-29 | 1982-01-28 | 1982-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-29 | 1986-01-28 | 1986-07-30 | $7700.00 | Window Closed / Lapsed |