US3807682A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Accelerated knock-out for molded parts
Assignee: Individual
•
Filing: 1972-12-29
•
Granted: 1974-04-30
•
Expires: 1992-12-29
Abstract
Abstract The embodiment of the invention disclosed herein is directed to an accelerated knock-out for molded parts which are formed in a plastic molding die. The knock-out includes a body portion having a fixed pivot extending therethrough and pivotally secured to a center support plate of the plastic molding die. Extending from one end of the body is a push rod which passes through a second movable mold plate of the molding die and engages the part being molded to eject the same when the mold opens. The push rod is secured to the body by means of a movable pivot so that slight transverse motion of the pivot is accomplished during pivotal movement of the body about its fixed pivot. First and second arms extend from opposite sides of the body, preferably extending toward the mold plate and a back plate for engaging such plates to cause pivotal movement of the body and linear movement of the push rod for ejecting the molded part. Positive return of the accelerated knock-out is accomplished by positive engagement of the second arm with the back plate structures of the mold die.
Inventors
- 👤 M Knutson
- 👤 L Catinella
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:48
CPC Classifications
B; B29; B29C; B29C33/00; B29C33/44; B29C33/442; B29C45/00; B29C45/17; B29C45/40; B29C45/4005; B29C2045/4031
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
253 words
A molding die comprising, a first mold plate, a second mold plate movable relative to said first mold plate, a mold cavity formed between said first and second mold plates, a back plate spaced from but movable with said second mold plate, said second mold plate and said back plate having facing inside surfaces, a center plate positioned between said second mold plate and said back plate, said center plate having an opening formed therein, an accelerated knock-out structure mounted within the opening of said center plate and extending through said second mold plate for ejecting parts formed in the cavity, said accelerated knockout structure including a body, a first pivot means extending through said body intermediate the ends thereof for pivotally securing the body at a fixed point within said opening of said center plate, a push rod pivotally connected to one end of said body and extending through said second mold plate, said push rod being pivoted in such a manner as to provide a moving pivot point, first arm means extending from said body for engaging the inside surface of said second mold plate while moving in one direction for causing accelerated movement of said push rod toward the part formed within said cavity for ejecting the same, and second arm means extending from said body for engaging the inside surface of said back plate when moving in the opposite direction for returning said body and said push rod to its initial condition so that subsequent parts can be molded.
Claim 2
Dependent Claim
253 words
A molding die comprising, a first mold plate, a second mold plate movable relative to said first mold plate, a mold cavity formed between said first and second mold plates, a back plate spaced from but movable with said second mold plate, said second mold plate and said back plate having facing inside surfaces, a center plate positioned between said second mold plate and said back plate, said center plate having an opening formed therein, an accelerated knock-out structure mounted within the opening of said center plate and extending through said second mold plate for ejecting parts formed in the cavity, said accelerated knockout structure including a body, a first pivot means extending through said body intermediate the ends thereof for pivotally securing the body at a fixed point within said opening of said center plate, a push rod pivotally connected to one end of said body and extending through said second mold plate, said push rod being pivoted in such a manner as to provide a moving pivot point, first arm means extending from said body for engaging the inside surface of said second mold plate while moving in one direction for causing accelerated movement of said push rod toward the part formed within said cavity for ejecting the same, and second arm means extending from said body for engaging the inside surface of said back plate when moving in the opposite direction for returning said body and said push rod to its initial condition so that subsequent parts can be molded.
Claim 3
Dependent Claim
55 words
The molding die according to claim 1, wherein said first and second arm means are threaded studs extending from said body and threadedly receiving a lock nut for locking the position of said stud, whereby adjustment of the position of the stud relative to said second mold plate and said back plate is easily accomplished.
Claim 4
Dependent Claim
31 words
The molding die according to claim 1, further including adaptor means, said adaptor means arranged for receiving said push rod and being pivotally connected to said body by said movable pivot.
References Cited (Backward Citations)
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Cited
US2425004A
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US2581854A
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US2718032A
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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) | 1977-04-29 | 1977-10-29 | 1978-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-29 | 1981-10-29 | 1982-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-29 | 1985-10-29 | 1986-04-30 | $7700.00 | Window Closed / Lapsed |