US3737273A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Neck forming plug with embedded diamond particles
Assignee: Phillips Petroleum Co
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Filing: 1971-01-07
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Granted: 1973-06-05
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Expires: 1991-01-07
Abstract
Abstract In the forming of a hollow object from a temperature conditioned thermoplastic parison, the parison is clamped at one end by a neck forming means, and a plug with diamond particles embedded in the surface thereof is inserted into this end of the parison to force the thermoplastic to conform to the shape of the neck forming means.
Inventors
- 👤 R Conner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:04
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/42; B29C49/76; B29C49/761
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
90 words
Blow molding apparatus comprising in combination: means for forming the neck portion of a finished article comprising jaw means and a plug; said jaw means being adapted to grasp an open end of a thermoplastic tubular parison; said plug being coaxially disposed relative to said jaw means, and being made of a material having a Brinell hardness of at least 40 having embedded on a surface thereof diamond particles having a grit size within the range of 150-2000; and means for moving said plug axially relative to said jaw means.
Claim 2
Dependent Claim
90 words
Blow molding apparatus comprising in combination: means for forming the neck portion of a finished article comprising jaw means and a plug; said jaw means being adapted to grasp an open end of a thermoplastic tubular parison; said plug being coaxially disposed relative to said jaw means, and being made of a material having a Brinell hardness of at least 40 having embedded on a surface thereof diamond particles having a grit size within the range of 150-2000; and means for moving said plug axially relative to said jaw means.
Claim 3
Dependent Claim
45 words
Apparatus according to claim 1 wherein said plug has a first cylindrical section adapted to enter said parison, and a second cylindrical section adjacent to said first section having a larger diameter, said first and second sections being connected by a gradually sloping shoulder section.
Claim 4
Dependent Claim
27 words
Apparatus according to claim 2 wherein said second section has a surface finish within the range of 1-125 microinches rms, over which is superimposed generally annular serrations.
Claim 5
Dependent Claim
18 words
Apparatus according to claim 3 wherein said finish is within the range of 3 to 10 microinches rms.
Claim 6
Dependent Claim
30 words
Apparatus according to claim 3 wherein the portions of said plug having diamond particles embedded therein have at least 50 percent of the surfaces thereof covered by said diamond particles.
Claim 7
Dependent Claim
29 words
Apparatus according to claim 3 wherein static coefficient friction of said plug as measured against a similar material is less than half the coefficient friction of the base material.
Claim 8
Dependent Claim
29 words
Apparatus according to claim 1 wherein said material having a hardness of greater than 40 is selected from the group consisting of brass, stainless steel, and a cobalt-chromium-carbon alloy.
Claim 9
Dependent Claim
65 words
Apparatus according to claim 1 comprising in addition: means to extrude a continuous length of tubing; means to cool said tubing; means to cut said tubing into said tubular parisons; means to reheat said tubular parisons; means to stretch said tubular parisons longitudinally; mold means; and means to introduce fluid pressure into said parison so as to expand same into conformity with said mold means.
References Cited (Backward Citations)
GB190513458A
Cited
US2330837A
Cited
US2890483A
Cited
US3127636A
Cited
US3360826A
Cited
US3311950A
Cited
US3466707A
Cited
US3507005A
Cited
US3550200A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |