US3594869A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Injection molding machine
Assignee: Individual
•
Filing: 1969-02-19
•
Granted: 1971-07-27
•
Expires: 1989-02-19
Abstract
Abstract Stationary framework carries stationary mold part. Movable mold part carried by injection assembly slidable on framework toward and away from stationary mold part, mold parts defining a closed cavity when they meet. Injection assembly includes chamber containing molten plastic, and a ram is movable with respect to framework into and out of chamber. Cross-sectional area of ram larger than cross-sectional area of mold cavity so that ram pressure simultaneously holds mold parts closed and injects plastic into cavity.
Inventors
- 👤 Fred D Sher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:12
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/70; B29C45/706
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
209 words
A molding machine comprising a stationary mold part, an injection assembly movable toward and away from said stationary mold part, a movable mold part between said stationary mold part and said injection assembly and movable in a direction parallel to the direction of movement of said assembly into and out of engagement with said stationary mold part in response to movements of said injection assembly, said mold parts defining a closed mold cavity when they meet, said injection assembly including a chamber for containing molten plastic, and a ram movable into and out of said chamber in a direction parallel to the direction of movement of said assembly, the cross-sectional area of said ram being larger than the area of said mold cavity in a plane perpendicular to the direction of movement of said assembly and ram, whereby movement of said ram toward said stationary mold part initially causes said assembly to move toward said stationary mold part until said movable and stationary mold parts meet and continued movement of said ram simultaneously forces molten plastic from said chamber into said mold cavity and holds said mold parts together, said ram serving as the only force-producing part of said machine serving to hold said mold parts together during molding.
Claim 2
Dependent Claim
209 words
A molding machine comprising a stationary mold part, an injection assembly movable toward and away from said stationary mold part, a movable mold part between said stationary mold part and said injection assembly and movable in a direction parallel to the direction of movement of said assembly into and out of engagement with said stationary mold part in response to movements of said injection assembly, said mold parts defining a closed mold cavity when they meet, said injection assembly including a chamber for containing molten plastic, and a ram movable into and out of said chamber in a direction parallel to the direction of movement of said assembly, the cross-sectional area of said ram being larger than the area of said mold cavity in a plane perpendicular to the direction of movement of said assembly and ram, whereby movement of said ram toward said stationary mold part initially causes said assembly to move toward said stationary mold part until said movable and stationary mold parts meet and continued movement of said ram simultaneously forces molten plastic from said chamber into said mold cavity and holds said mold parts together, said ram serving as the only force-producing part of said machine serving to hold said mold parts together during molding.
Claim 3
Dependent Claim
22 words
A molding machine as defined in claim 1 wherein said movable mold part is mounted on and moves with said injection assembly.
Claim 4
Dependent Claim
27 words
A molding machine as defined in claim 2 including means carried by said injection assembly through which said mold cavity communicates with the interior of said chamber.
Claim 5
Dependent Claim
36 words
A molding machine as defined in claim 1 including a stationary framework upon which said stationary mold part is mounted, said framework including at least one rail, said injection assembly being slidably supported on said rail.
Claim 6
Dependent Claim
79 words
A molding machine as defined in claim 4 including a pair of said rails, driving means on said framework for moving said ram, and means for connecting said driving means to said ram, said connection means being the only means connecting said injection assembly and ram to said framework, whereby when said connection means is disconnected said injection assembly and ram can be lifted off said rail and replaced with an injection assembly having a ram of different size.
Claim 7
Dependent Claim
59 words
A molding machine as defined in claim 5 including at least one bearing projecting laterally from each side of said injection assembly, each bearing resting slidably on one of said rails and being devoid of any portion facing the underside of its respective rail, whereby said bearings do not interfere with lifting of said injection assembly from said rails.
Claim 8
Dependent Claim
69 words
A molding machine as defined in claim 5 wherein said driving means includes a movable piston and a piston rod for transmitting movements of said piston to said ram, and said connection means includes a member engaging said ram and removably secured to said piston rod, said member and ram carrying means cooperable to transmit movement of said piston rod away from said stationary mold part to said ram.
Claim 9
Dependent Claim
71 words
A molding machine as defined in claim 7 including a second member secured to said piston rod below said removable member, said ram being sandwiched between said members, and a pin projecting from said injection assembly and slidably arranged between said members, said pin and at least onE of said members carrying means cooperable to transmit movement of said piston rod away from said stationary mold part to said injection assembly.
Claim 10
Dependent Claim
55 words
A molding machine as defined in claim 8 including ejector means movable into the cavity portion of said stationary mold part for ejecting molded articles therefrom upon completion of the molding cycle, and means carried by said injection assembly for actuating said ejector means upon movement of said assembly away from said stationary mold part.
References Cited (Backward Citations)
US2577412A
Cited
US3174187A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |