Patent US844868A successfully refreshed from Google Patents.
US3594864A
Expired / Lapsed
US
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Mold actuated parison stretching device
Assignee: Phillips Petroleum Co
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Filing: 1969-08-18
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Granted: 1971-07-27
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Expires: 1989-08-18
Abstract
Abstract A parison preform held within a molding zone is gripped and stretched by means of a mechanism mechanically connected to the mold halves. As the mold halves close, jaw means are first converged to clamp the parison and then moved axially to stretch same.
Inventors
- 👤 Dixie E Gilbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:03
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/08; B29C49/10; B29C49/14
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
149 words
Apparatus for stretching a parison preform comprising in combination: a first mold half; a second mold half in opposed relationship to said first mold half; a first arm means having a gripping means on one end thereof, said arm being rotatably carried by said first mold half; a second arm means having a gripping means on one end thereof, said second arm means being rotatably carried by said secoNd mold half; a first cam follower attached to said first arm; a second cam follower attached to said second arm; a first cam track adapted to receive said first cam follower; a second cam track adapted to receive said second cam follower, said first and second cam tracks being so contoured that forward motion of said mold halves causes said gripping means to converge and thereafter move axially in a direction parallel to the longitudinal axis of said mold halves.
Claim 2
Dependent Claim
149 words
Apparatus for stretching a parison preform comprising in combination: a first mold half; a second mold half in opposed relationship to said first mold half; a first arm means having a gripping means on one end thereof, said arm being rotatably carried by said first mold half; a second arm means having a gripping means on one end thereof, said second arm means being rotatably carried by said secoNd mold half; a first cam follower attached to said first arm; a second cam follower attached to said second arm; a first cam track adapted to receive said first cam follower; a second cam track adapted to receive said second cam follower, said first and second cam tracks being so contoured that forward motion of said mold halves causes said gripping means to converge and thereafter move axially in a direction parallel to the longitudinal axis of said mold halves.
Claim 3
Dependent Claim
45 words
Apparatus according to claim 1 comprising in addition: jaw means disposed adjacent to one end of said mold halves adapted to hold one end of a tubular workpiece as said gripping means seals the other end and moves axially so as to stretch said workpiece.
Claim 4
Dependent Claim
19 words
Apparatus according to claim 2 comprising in addition: means to introduce preblow fluid into the interior of said parison.
Claim 5
Dependent Claim
64 words
Apparatus according to claim 2 wherein a leading surface of each of said mold halves, adjacent a bottom surface of said mold which forms a part of the bottom wall of the article being molded, has a severing edge disposed a short distance from said wall-forming surface, said leading surface further having a bead-forming cavity between said severing edge and said bottom wall-forming surface.
Claim 6
Dependent Claim
38 words
Apparatus according to claim 2 wherein said gripping means at the furthermost extension of its axial travel is positioned in cooperative relationship with leading edges of one end of said mold to form a part of said mold.
Claim 7
Dependent Claim
11 words
Apparatus according to claim 4 wherein said bead-forming cavity is round.
Claim 8
Dependent Claim
47 words
Apparatus according to claim 5 wherein leading surfaces of said gripping means have matching severing edges disposed a short distance from a bottom wall-forming surface thereof, said leading surfaces of said gripping elements further having a bead-forming cavity between said severing edge and said bottom wall-forming surface.
Claim 9
Dependent Claim
11 words
Apparatus according to claim 7 wherein said bead-forming cavity is round.
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) | 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 |