Patent US4787841A successfully refreshed from Google Patents.
US4787841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sprue ejector in automatic injection molding machines
Assignee: Individual
•
Filing: 1987-11-25
•
Granted: 1988-11-29
•
Expires: 2007-11-25
Abstract
Abstract An apparatus for removing the sprue from an injection mold, having a cylinder and an associated piston rod, in which the piston rod extends between the two halves of the mold into the runner when the injection mold is closed. Molding material is molded around the forward end of the piston rod during the injection. Upon opening of the mold the sprue fixedly carried by the forward end is removed by movement of the piston rod into the cylinder.
Inventors
- 👤 Hans Simon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:43
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/1759
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
137 words
In an injection molding machine having two mold halves and means for moving the mold halves relative to each other in an axial direction, an apparatus for removing a sprue from the molding machine, said apparatus comprising: a cylinder, an associated piston rod connected to said cylinder, said piston rod having a front end, means for extending the front end of the piston rod from the cylinder transversely to the axial direction and between said two mold halves into a space forming the sprue so that during injection molding material will be molded around the front end of said piston rod and form the sprue, and means for retracting the piston rod with the sprue, upon separation of the mold halves, into the cylinder and for separating the sprue from the front end of said piston rod.
Claim 2
Dependent Claim
137 words
In an injection molding machine having two mold halves and means for moving the mold halves relative to each other in an axial direction, an apparatus for removing a sprue from the molding machine, said apparatus comprising: a cylinder, an associated piston rod connected to said cylinder, said piston rod having a front end, means for extending the front end of the piston rod from the cylinder transversely to the axial direction and between said two mold halves into a space forming the sprue so that during injection molding material will be molded around the front end of said piston rod and form the sprue, and means for retracting the piston rod with the sprue, upon separation of the mold halves, into the cylinder and for separating the sprue from the front end of said piston rod.
Claim 3
Dependent Claim
31 words
An apparatus according to claim 1, wherein the molding machine has a movable platen connected to one of the mold halves, and wherein the cylinder is connected to the movable platen.
Claim 4
Dependent Claim
36 words
An apparatus according to claim 1, wherein a guide tube surrounds the piston rod, so that said guide tube separates said sprue from the front end of said piston rod when said piston rod is retracted.
Claim 5
Dependent Claim
36 words
An apparatus according to claim 2, wherein a guide tube surrounds the piston rod, so that said guide tube separtes said sprue form the front end of said piston rod when said piston rod is retracted.
Claim 6
Dependent Claim
30 words
An apparatus according to claim 1, comprising means for positioning the cylinder relative to the mold halves in three mutually orthogonal directions, and means for fixing the cylinder in position.
Claim 7
Dependent Claim
30 words
An apparatus according to claim 2, comprising means for positioning the cylinder relative to the mold halves in three mutually orthogonal directions, and means for fixing the cylinder in position.
Claim 8
Dependent Claim
30 words
An apparatus according to claim 3, comprising means for positioning the cylinder relative to the mold halves in three mutually orthogonal directions, and means for fixing the cylinder in position.
Claim 9
Dependent Claim
30 words
An apparatus according to claim 4, comprising means for positioning the cylinder relative to the mold halves in three mutually orthogonal directions, and means for fixing the cylinder in position.
Claim 10
Independent Claim
33 words
An apparatus according to any one of claims 6 to 8, wherein said means for positioning the cylinder comprises a shaft mounted on the movable platen, and about which said cylinder is rotatable.
Claim 11
Dependent Claim
41 words
An apparatus according to claim 9, wherein said shaft extends vertically, a bushing movable along said shaft, and means for fixing the bushing in position on said shaft, said bushing carrying a horizontal arm, said cylinder being movable along said arm.
Claim 12
Dependent Claim
25 words
An apparatus according to claim 10, comprising a carrier plate carrying said cylinder, and means for fixing the carrier plate in position on said arm.
Claim 13
Dependent Claim
53 words
An apparatus according to claim 9, in a molding machine having a stationary bridge, said apparatus comprising a cam mounted on said bridge and adjustable relative thereto in the axial direction of the runner, a lever arm connected to said shaft, and a roller on said lever arm and cooperating with said cam.
References Cited (Backward Citations)
US2330369A
Cited
US3028629A
Cited
US4085178A
Cited
US4124352A
Cited
US4239476A
Cited
US4715806A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-11-29 | 1992-05-30 | 1992-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-29 | 1996-05-30 | 1996-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-29 | 2000-05-30 | 2000-11-29 | $7700.00 | Window Closed / Lapsed |