US3771928A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for molding polyurethane articles
Assignee: Individual
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Filing: 1971-06-28
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Granted: 1973-11-13
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Expires: 1991-06-28
Abstract
Abstract Polyurethane articles, such as shoe soles, are molded in a plurality of molds mounted on a turntable for rotation from a first station for closing the molds to a second station for dispensing reactants into the molds and around the major portion of a circle to an unloading station. During unloading and loading, the molds are horizontal, and during dispensing and travel to the unloading station the molds are tilted, with the base of each mold at an angle of 30* to 75* from the horizontal.
Inventors
- 👤 T Gostyn
- 👤 W Schilke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:00
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/38; B29C44/42; B29C44/428; B29C45/00; B29C45/03; B29C45/04; B29C45/06; B29D; B29D35/00; B29D35/0009; B29C33/00; B29C33/34; B29C33/36; B29K; B29K2075/00; B29L; B29L2031/00; B29L2031/48; B29L2031/50; B29L2031/504; Y; Y10; Y10S; Y10S264/00; Y10S264/83
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
102 words
An apparatus for molding polyurethane articles comprising a plurality of molds for receiving liquid reactants capable of forming microcellular, expanded polyurethane; means for moving said molds along a path of travel; a dispensing device in said path of travel for injecting said liquid reactants vertically into each said mold; means for tilting said mold from a horizontal to a tilted position prior to injection of said reactants into one end of said mold and for returning said mold to a horizontal position following formation of said microcellular, expanded polyurethane in said mold, whereby charging of the mold with said reactants is facilitated.
Claim 2
Independent Claim
102 words
An apparatus for molding polyurethane articles comprising a plurality of molds for receiving liquid reactants capable of forming microcellular, expanded polyurethane; means for moving said molds along a path of travel; a dispensing device in said path of travel for injecting said liquid reactants vertically into each said mold; means for tilting said mold from a horizontal to a tilted position prior to injection of said reactants into one end of said mold and for returning said mold to a horizontal position following formation of said microcellular, expanded polyurethane in said mold, whereby charging of the mold with said reactants is facilitated.
Claim 3
Dependent Claim
29 words
An apparatus according to claim 1, wherein said dispensing device includes a dispensing head, and means for moving said dispensing head vertically toward and away from each said mold.
Claim 4
Dependent Claim
37 words
An apparatus according to claim 2, including nozzle means on said dispensing head, and an expansion cup on one end of said mold for receiving said nozzle means when the dispensing head is moved toward said mold.
Claim 5
Dependent Claim
45 words
An apparatus according to claim 1, wherein said means for moving said molds along a path of travel includes a frame; a turntable rotatably mounted on said frame for supporting each said mold; and a drive mechanism for rotating said turntable stepwise on said frame.
Claim 6
Dependent Claim
93 words
An apparatus according to claim 4, including a mold carrier for each said mold pivotally mounted on said frame for rotation about a horizontal axis; said means for tilting each said mold including track means mounted on said frame beneath each said mold carrier; and roller means on each said mold carrier for running on said track means with said mold in a tilted position, said track means including a cam surface for tilting each said mold successively from a tilted to a horizontal position and for returning each mold to the horizontal.
Claim 7
Dependent Claim
58 words
An apparatus according to claim 2, including a pan removably disposed beneath said dispensing head for catching any material dripping from said dispensing head when the head is away from said mold; and means for moving said pan out of the path of travel of the dispensing head when the dispensing head is moved toward each said mold.
Claim 8
Dependent Claim
83 words
An apparatus according to claim 6, including slide means supporting said dispensing head; a cam surface on said slide means; an arm pivotally mounted on said slide means for supporting said pan; and roller means on said arm for engaging said cam surface to move said arm and pan out of the path of travel of said dispensing head when the dispensing head is moved toward each mold and beneath the dispensing head when the dispensing head is moved away from the mold.
Claim 9
Dependent Claim
40 words
An apparatus according to claim 7, including means pivotally connecting said pan to said arm, whereby movement of said dispensing head and slide causes rotation of said pan out of the path of travel of or beneath said dispensing head.
Claim 10
Dependent Claim
29 words
An apparatus according to claim 7, including fixed track means for slidably supporting said pan for horizontal movement out of the path of travel or beneath said dispensing head.
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) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |