US3754848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High speed single cavity molding apparatus
Assignee: CPI Inc
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Filing: 1971-11-10
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Granted: 1973-08-28
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Expires: 1991-11-10
Abstract
Abstract An automatic, single cavity injection molding apparatus especially useful for the manufacture of circular shaft oil seals reinforced with a metal case,having a trunnion-mounted, upper assembly through which molding material is injected under high pressure and then is liquefied and heated by being forced through an orifice in an upper mold half, a carriage supporting a pair of lower mold halves alternately pivotal to positions wherein one of said lower mold halves is in mating relationship with the upper mold half and the other is in a second position where the molded article is ejected and a new reinforcing casing can be inserted.
Inventors
- 👤 J Choate
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:27
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/03; B29C45/04; B29C45/0441; B29C2045/0483; Y; Y10; Y10S; Y10S425/00; Y10S425/047
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
295 words
An injection molding machine comprising a framework, an extruder head, first means connected to said framework supporting said extruder head in a predetermined position, said extruder head oriented to extrude a moldable material downwardly, second means connected to said extruder head for supporting a male mold section at the exit end of said extruder head, a pivot carriage, an eccentric shaft rotatably supported in said framework, said eccentric shaft extending in a horizontal direction beneath said extruder head, third means guiding said pivot carriage for reciprocal movement vertically, fourth means rotatably coupling said pivot carriage to said eccentric shaft whereby rotation of said eccentric shaft in one direction moves said pivot carriage upwardly and rotation of said eccentric shaft in the opposite direction moves said pivot carriage downwardly, a mold carriage, means rotatably coupling said mold carriage to said pivot carriage whereby said mold carriage swivels in in a vertical plane relative to said pivot carriage, said mold carriage including means for holding first and second like female mold sections having first positions mating with said male mold section and forming a mold cavity, said first and second female mold sections being angularly moveable relative to the pivot point of said mold carriage to a second unloading positions, fifth means swinging said mold carriage in one direction to align said first female mold section with said male mold section and then in the opposite direction to align said second female mold section with said male mold section, and sixth means rotating said eccentric shaft in said one direction so as to raise said mold carriage to a level sufficient for the alignment of one of said first and second female mold sections in engagement with said male mold section to form said mold cavity therewith.
Claim 2
Dependent Claim
295 words
An injection molding machine comprising a framework, an extruder head, first means connected to said framework supporting said extruder head in a predetermined position, said extruder head oriented to extrude a moldable material downwardly, second means connected to said extruder head for supporting a male mold section at the exit end of said extruder head, a pivot carriage, an eccentric shaft rotatably supported in said framework, said eccentric shaft extending in a horizontal direction beneath said extruder head, third means guiding said pivot carriage for reciprocal movement vertically, fourth means rotatably coupling said pivot carriage to said eccentric shaft whereby rotation of said eccentric shaft in one direction moves said pivot carriage upwardly and rotation of said eccentric shaft in the opposite direction moves said pivot carriage downwardly, a mold carriage, means rotatably coupling said mold carriage to said pivot carriage whereby said mold carriage swivels in in a vertical plane relative to said pivot carriage, said mold carriage including means for holding first and second like female mold sections having first positions mating with said male mold section and forming a mold cavity, said first and second female mold sections being angularly moveable relative to the pivot point of said mold carriage to a second unloading positions, fifth means swinging said mold carriage in one direction to align said first female mold section with said male mold section and then in the opposite direction to align said second female mold section with said male mold section, and sixth means rotating said eccentric shaft in said one direction so as to raise said mold carriage to a level sufficient for the alignment of one of said first and second female mold sections in engagement with said male mold section to form said mold cavity therewith.
Claim 3
Dependent Claim
138 words
An injection molding machine as defined by claim 1 further including seventh means for sequentially operating said fourth means for rotating said eccentric shaft and said means for swiveling said mold carriage so that each of said first and second female mold sections in turn is (a) swung into alignment with said male mold section, (b) moved upward into tight engagement with said male mold section, (c) moved downward away from said male mold section, and (c) swung out of alignment with said male mold section, and means for operating said extruder head so that said moldable material is extruded into the cavity formed by said male mold section and the aligned one of said first and second female mold sections immediately after said eccentric shaft has been rotated in said one direction to effect said tight engagement.
Claim 4
Dependent Claim
18 words
injection means adapted to inject a moldable material through said injection conduit while said mold halves are closed,
Claim 5
Dependent Claim
18 words
injection means adapted to inject a moldable material through said injection conduit while said mold halves are closed,
Claim 6
Dependent Claim
16 words
support and alignment adapted to open and close said mold halves while maintaining alignment thereof, and
Claim 7
Dependent Claim
16 words
support and alignment adapted to open and close said mold halves while maintaining alignment thereof, and
Claim 8
Dependent Claim
39 words
An injection molding machine as defined by claim 3 further including eighth means for removing molding parts from each of said first and second like female mold sections after each said female mold section is in said second position.
Claim 9
Dependent Claim
47 words
An injection molding machine as defined by claim 1 further including means for evacuating said mold cavity formed between each of said first and second like female mold sections and said male mold section, and means for operating said evacuating means before operation of said extruder means.
Claim 10
Dependent Claim
152 words
a framework supporting all of the above; the improvement comprising: having only one of said first mold halves and at least two of second mold halves with said support and alignment means including a yoke adapted to receive and support each of said second mold halves reciprocally in two positions: a first position mating with said first mold half and a second unloading position out of alignment with said first mold half; said support and alignment means comprising a carriage supported by said framework and moveable back and forth along the center line of said mold cavity to effect the opening and closing action of said mold halves, and said yoke being Y-shaped with each upper arm thereof mounting one of said second mold halves, said yoke being pivotally mounted on said carriage for reciprocating rotation in a plane inclusive of said center line to and from said first and second positions.
Claim 11
Dependent Claim
152 words
a framework supporting all of the above; the improvement comprising: having only one of said first mold halves and at least two of second mold halves with said support and alignment means including a yoke adapted to receive and support each of said second mold halves reciprocally in two positions: a first position mating with said first mold half and a second unloading position out of alignment with said first mold half; said support and alignment means comprising a carriage supported by said framework and moveable back and forth along the center line of said mold cavity to effect the opening and closing action of said mold halves, and said yoke being Y-shaped with each upper arm thereof mounting one of said second mold halves, said yoke being pivotally mounted on said carriage for reciprocating rotation in a plane inclusive of said center line to and from said first and second positions.
Claim 12
Dependent Claim
41 words
An injection molding machine as defined by claim 1 where-in said mold carriage and said pivot carriage are coupled by a second shaft journaled in said pivot carriage, and further wherein said guide means engage the ends of said second shaft.
Claim 13
Dependent Claim
21 words
An injection molding machine as defined by claim 5 wherein said second shaft forms the pivot axis for said mold carriage.
Claim 14
Dependent Claim
31 words
An injection molding machine as defined by claim 1 wherein said first and second like mold sections are aligned in a vertical plane extending at right angles to said eccentric shaft.
Claim 15
Dependent Claim
48 words
An injection molding machine as defined by claim 1 wherein said means for swiveling said mold carriage comprises a double action fluid pressure actuator, each end of which is connected to a common heat expansion off-setting activating rod which is in turn pivotally connected to said mold carriage.
Claim 16
Dependent Claim
58 words
An injection molding machine as defined by claim 1 further including means for removing finished parts from said first and second mold sections when each is in its second unloading position, said means comprising like extractor members on opposite sides of said frame and means for reciporcating said extractor members along paths extending parallel to said eccentric shaft.
Claim 17
Dependent Claim
11 words
In apparatus adapted for single cavity injection molding, said apparatus including:
Claim 18
Dependent Claim
11 words
In apparatus adapted for single cavity injection molding, said apparatus including:
Claim 19
Dependent Claim
40 words
The apparatus of claim 10 wherein said support and alignment means are adapted to bring said mold halves into relatively close alignment and said first and second mold halves are adapted to effect fine self-alignment during the final closing movement.
Claim 20
Dependent Claim
39 words
The apparatus of claim 11 wherein said mold halves when closed are adpated to form a hermetic seal and including vacuum means adapted to evacuate said mold cavity after mold closing and prior to injection of said elastomer precursor.
Claim 21
Dependent Claim
39 words
The apparatus of claim 10 wherein said apparatus includes eject means for removing the completed seal from said second mold half and insertion means for inserting a casing, both when said second mold half is in said second position.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |