US3768948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blow mold
Assignee: Monsanto Co
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Filing: 1971-12-20
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Granted: 1973-10-30
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Expires: 1991-12-20
Abstract
Abstract A blow mold having high heat transfer capacity which includes carrier supported shells with cavity portions defining the article shape, each shell having the fins on its back surface extending toward its carrier, and a backing member intermediate each carrier and shell which closes the front of the grooves between the fins to form heat transfer channels on the back of each shell, the backing member being contoured to direct fluid to and away from the channels in a streamlined fashion. The mold is formed by milling grooves in the back surface of a formed shell, assemblying the shell to the carrier with the grooves spaced from and facing the carrier and with contoured filler blocks in place at opposite ends of the space, filling the remaining space between the carrier and shell with the backing member without completely filling the grooves and then removing the blocks leaving voids defining manifolds communicating with the ends of the grooves.
Inventors
- 👤 C Horberg
- 👤 R Shelby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:14
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/42; B29C49/48; B29C49/4823; F; F28; F28F; F28F3/00; F28F3/02
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
138 words
A mold for shaping blown hollow plastic articles which comprises: a. carrier members having heat transfer fluid inlet and outlet openings; b. mold shell portions secured to the carrier members having interior surfaces forming a cavity conforming to the shape of said articles when the mold is in closed position, each shell portion having fins projecting from its outer surface toward the carrier member in which it is secured; c. a filler block engaged with wall portions of each carrier member and end portions of the fins thus forming with said fins channels for passage of the heat transfer fluid therethrough, said filler blocks forming contoured manifolds communicating with the openings in said carrier members and with the ends of said channels for directing the heat transfer fluid to and removing it from opposite ends of said channels.
Claim 2
Dependent Claim
138 words
A mold for shaping blown hollow plastic articles which comprises: a. carrier members having heat transfer fluid inlet and outlet openings; b. mold shell portions secured to the carrier members having interior surfaces forming a cavity conforming to the shape of said articles when the mold is in closed position, each shell portion having fins projecting from its outer surface toward the carrier member in which it is secured; c. a filler block engaged with wall portions of each carrier member and end portions of the fins thus forming with said fins channels for passage of the heat transfer fluid therethrough, said filler blocks forming contoured manifolds communicating with the openings in said carrier members and with the ends of said channels for directing the heat transfer fluid to and removing it from opposite ends of said channels.
Claim 3
Dependent Claim
15 words
The mold of claim 1 wherein said channels follow the contour of the mold cavity.
Claim 4
Dependent Claim
29 words
The mold of claim 1 wherein the cross sectional area of the manifolds at the feed end of the channels is less than the upstream cross sectional area thereof.
Claim 5
Dependent Claim
22 words
The mold of claim 1 wherein said fins are longitudinally disposed and extend substantially perpendicular to the parting line of the mold.
Claim 6
Dependent Claim
17 words
The mold of claim 1 wherein said fins extend radial to the axis of the mold cavity.
Claim 7
Dependent Claim
26 words
The mold of claim 1 wherein the filler comprises on a weight basis 48-55 percent bismuth, 28.5-44 percent lead, 1-14.5 percent tin and 9 percent antimony.
Claim 8
Dependent Claim
15 words
The mold of claim 1 including gasket members between the carriers and mold shell portions.
Claim 9
Dependent Claim
128 words
A mold for shaping blown hollow plastic articles which comprises: a. carrier members having cooling fluid inlet and outlet openings; b. thin metal mold shell portions secured to the carrier members having interior contoured surfaces conforming to the shape of said articles when the mold is in closed position, each shell portion having longitudinally disposed fins following the contour of the mold cavity projecting from its outer surface toward the walls of the carrier member in which it is secured; and c. a metal alloy filler block frictionally engaged with wall portions of each carrier member and with end portions of the fins along the length thereof thus forming channels with said fins for passage of a cooling medium therethrough to reduce the temperature of the cavity surface.
Claim 10
Dependent Claim
128 words
A mold for shaping blown hollow plastic articles which comprises: a. carrier members having cooling fluid inlet and outlet openings; b. thin metal mold shell portions secured to the carrier members having interior contoured surfaces conforming to the shape of said articles when the mold is in closed position, each shell portion having longitudinally disposed fins following the contour of the mold cavity projecting from its outer surface toward the walls of the carrier member in which it is secured; and c. a metal alloy filler block frictionally engaged with wall portions of each carrier member and with end portions of the fins along the length thereof thus forming channels with said fins for passage of a cooling medium therethrough to reduce the temperature of the cavity surface.
Claim 11
Dependent Claim
55 words
The mold of claim 8 wherein said alloy forms contoured manifolds with surfaces of the shell portions and the walls of the carrier members which communicate with the openings in the carrier members and with the open ends of the channels for selectively directing the flow of a cooling medium to and from said channels.
Claim 12
Dependent Claim
25 words
The mold of claim 8 wherein each carrier member has a separate opening with a removable cap for said metal alloy when in liquid form.
Claim 13
Dependent Claim
39 words
The mold of claim 8 wherein the mold shell portions are formed of a metal having good thermal conductivity and the carrier members are formed of a metal having poor thermal conductivity relative to that of the shell portions.
References Cited (Backward Citations)
US3097398A
Cited
US3363282A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |