US3912435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blow molding apparatus
Assignee: Graham Packaging Plastic Products Inc
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Filing: 1974-05-06
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Granted: 1975-10-14
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Expires: 1994-05-06
Abstract
Abstract An apparatus for blow molding hollow, plastic articles to provide a finished base in the molding step is disclosed. A plastic parison is received between separable mold halves, each mold half having a top mold component and a bottom mold component. The bottom mold component is additionally movable along the center axis of the article. Also provided is a tailgripping assembly which is also movable along the center axis of the article and which grips the tail of the parison when the mold halves are in the closed position. The tail-gripping assembly is connected to a power source to provide such axial movement. Engaging means are provided for the tail-gripping means to engage the bottom mold component during movement of the former to impart movement to the latter while the mold halves are in a closed position. When the mold halves are closed the tail-gripping assembly grips the tail of the parison and then moves downwardly to separate the tail from the article and to also engage the bottom mold component. The engaged bottom mold components are pulled away from the article. Upon opening of the mold halves the tailless article is free to fall from the mold as the bottom mold component has been pulled away from the article thus removing bottom support therefor.
Inventors
- 👤 Donald A Waring
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:27
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/42; B29C49/48; B29C49/50
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
219 words
An apparatus for blow molding hollow, plastic articles from tubular plastic parisons which includes: a. a split blow mold having two halves and a center axis, each half having a top mold component and a bottom mold component, said bottom mold component being movable along said center axis; b. two individual mold support means holding each individual mold half; c. power means connected to each support means to move each individual support means and each associated mold half in a direction substantially perpendicular to said center axis whereby said split blow mold can be opened and closed; d. tail-gripping means having two opposed halves, each half being held by one of said mold support means and said tailgripping means being movable along the center axis of said article; e. cooperating engaging means on said tail-gripping means and on said bottom mold component halves; and f. second power means coupled to said tail-gripping means to first move said tail-gripping means along said center axis and subsequently to move said tail-gripping means into engagement with said bottom mold component halves to move said mold component halves along said center axis whereby a tail is removed from said article by said first movement and whereby said subsequent movement facilitates removal of said article from said mold halves when said mold is opened.
Claim 2
Independent Claim
219 words
An apparatus for blow molding hollow, plastic articles from tubular plastic parisons which includes: a. a split blow mold having two halves and a center axis, each half having a top mold component and a bottom mold component, said bottom mold component being movable along said center axis; b. two individual mold support means holding each individual mold half; c. power means connected to each support means to move each individual support means and each associated mold half in a direction substantially perpendicular to said center axis whereby said split blow mold can be opened and closed; d. tail-gripping means having two opposed halves, each half being held by one of said mold support means and said tailgripping means being movable along the center axis of said article; e. cooperating engaging means on said tail-gripping means and on said bottom mold component halves; and f. second power means coupled to said tail-gripping means to first move said tail-gripping means along said center axis and subsequently to move said tail-gripping means into engagement with said bottom mold component halves to move said mold component halves along said center axis whereby a tail is removed from said article by said first movement and whereby said subsequent movement facilitates removal of said article from said mold halves when said mold is opened.
Claim 3
Dependent Claim
60 words
The apparatus of claim 1 wherein said bottom mold components together form a convex molding surface to impart a concave shape to the bottom of said article and each of said bottom mold components is engagable with the bottom portion of said top mold components so that upward motion of said bottom mold components along said center axis is restricted.
Claim 4
Dependent Claim
36 words
The apparatus of claim 1 wherein below said bottom mold components are stopping means attached to each of said mold support means for restricting the downward motion along said center axis of said bottom mold components.
Claim 5
Dependent Claim
101 words
The apparatus of claim 1 wherein said bottom mold components together form a convex molding surface to impart a concave shape to the bottom of said article and each of said bottom mold components is engagable with the bottom portion of said top mold components so that upward motion of said bottom mold components along said center axis is restricted and wherein each of the tail-gripping means is L-shaped, with the outside face of the verticle leg of said tail-gripping means having a serrated gripping surface and said horizontal leg of said tail-gripping means being attached to said second power means.
Claim 6
Dependent Claim
84 words
The apparatus of claim 4 wherein said engaging means on said tail-gripping means is a horizontally extending protuberance mounted on the inside surface of the vertical leg of said tail-gripping means and said engaging means on said bottom mold component halves is a channel into which said protuberances are slidily movable whereby movement of said tail-gripping means engages said gripping means with said bottom mold component halves for movement of said halves when said protuberances have moved to the outer extent of said channels.
Claim 7
Dependent Claim
38 words
The apparatus of claim 5 wherein the horizontal legs of said tail-gripping means fit flush within accommodating recesses in the bottom portions of said bottom mold component halves when said tail-gripping means is moved to its uppermost extent.
Claim 8
Dependent Claim
35 words
The apparatus of claim 6 wherein beneath said bottom mold component halves and attached to each of said mold support means are stopping means for restricting the downward motion of said bottom mold component halves.
Claim 9
Dependent Claim
28 words
The apparatus of claim 7 wherein guide means are attached to said mold support means for guiding said bottom mold component halves upon their upward and downward travel.
Claim 10
Independent Claim
259 words
An apparatus for blow molding hollow, plastic articles from tubular plastic parisons which includes: a. a split blow mold having two halves and a center axis, each half having a top mold component and a bottom mold component, said bottom mold componeNt being movable along said center axis; b. two individual mold support means holding each individual mold half; c. power means connected to each support means to move each individual support means and each associated mold half in a direction substantially perpendicular to said center axis whereby said split blow mold can be opened and closed; d. tail-gripping means having two opposed halves, each half being held by one of said mold support means, said tail-gripping means being movable along the center axis of said article and each of said tail-gripping means being generally L-shaped, with the outside face of the vertical leg of said tail-gripping means having a serrated gripping surface and said horizontal leg of said tail-gripping means being attached to said second power means; e. cooperating engaging means on said tail-gripping means and on said bottom mold components halves; and f. second power means coupled to said tail-gripping means to first move said tail-gripping means along said center axis and subsequently to move said tail-gripping means into engagement with said bottom mold component halves to move said mold component halves along said center axis whereby a tail is removed from said article by said first movement and whereby said subsequent movement facilitates removal of said article from said mold halves when said mold is opened.
Claim 11
Independent Claim
259 words
An apparatus for blow molding hollow, plastic articles from tubular plastic parisons which includes: a. a split blow mold having two halves and a center axis, each half having a top mold component and a bottom mold component, said bottom mold componeNt being movable along said center axis; b. two individual mold support means holding each individual mold half; c. power means connected to each support means to move each individual support means and each associated mold half in a direction substantially perpendicular to said center axis whereby said split blow mold can be opened and closed; d. tail-gripping means having two opposed halves, each half being held by one of said mold support means, said tail-gripping means being movable along the center axis of said article and each of said tail-gripping means being generally L-shaped, with the outside face of the vertical leg of said tail-gripping means having a serrated gripping surface and said horizontal leg of said tail-gripping means being attached to said second power means; e. cooperating engaging means on said tail-gripping means and on said bottom mold components halves; and f. second power means coupled to said tail-gripping means to first move said tail-gripping means along said center axis and subsequently to move said tail-gripping means into engagement with said bottom mold component halves to move said mold component halves along said center axis whereby a tail is removed from said article by said first movement and whereby said subsequent movement facilitates removal of said article from said mold halves when said mold is opened.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-13 | 1979-04-14 | 1979-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-13 | 1983-04-14 | 1983-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-13 | 1987-04-14 | 1987-10-14 | $7700.00 | Window Closed / Lapsed |