Patent US3682579A successfully refreshed from Google Patents.
US3682579A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for injection molding of plastic footwear articles
Assignee: Bata Shoe Co Inc
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Filing: 1968-12-03
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Granted: 1972-08-08
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Expires: 1988-12-03
Abstract
Abstract The molding of plastic articles particularly footwear in which two mold components are capable of being closed along a parting or separating line to provide at least in part a molding cavity and which components include recesses for constituting a supply duct for the cavity when the components are closed and at least one injection port leading from one of the recesses into the cavity at a location other than the parting or separating line.
Inventors
- 👤 Ladislav Hujik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:29
CPC Classifications
B; B29; B29D; B29D35/00; B29D35/06; B29D35/08; B29D35/081
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
141 words
An apparatus for molding plastic articles including a mold part having a supply duct formed therein and at least one injection port leading from said supply duct to a mold cavity, said mold part further being provided with an air venting duct of small dimensions connected between said supply duct and the atmosphere, said venting duct being sized so that any material to be injected through said at least one injection port which enters said venting duct will solidify, by virtue of the rapid contact cooling, to a sprue of such shape that it can be removed together with and attached to a supply duct sprue, said air venting duct of small dimensions being constituted by an annular clearance between the supply duct and a plug in the supply duct, with said plug having vent holes between said clearance and atmosphere.
Claim 2
Independent Claim
141 words
An apparatus for molding plastic articles including a mold part having a supply duct formed therein and at least one injection port leading from said supply duct to a mold cavity, said mold part further being provided with an air venting duct of small dimensions connected between said supply duct and the atmosphere, said venting duct being sized so that any material to be injected through said at least one injection port which enters said venting duct will solidify, by virtue of the rapid contact cooling, to a sprue of such shape that it can be removed together with and attached to a supply duct sprue, said air venting duct of small dimensions being constituted by an annular clearance between the supply duct and a plug in the supply duct, with said plug having vent holes between said clearance and atmosphere.
Claim 3
Dependent Claim
41 words
The apparatus as claimed in claim 1 in which said mold part is the sole plate of a mold for forming molded footwear soles either loose or attached to an upper, and said supply duct extends longitudinally within said sole plate.
Claim 4
Independent Claim
207 words
An apparatus for molding two-component footwear soles either loose or attached during the molding to an upper comprising, two side mold halves and a sole plate defining at least in part a mold cavity, means mounting said side mold halves and said sole plate for relative vertical displacement, said side mold halves having recesses which define a supply duct for said cavity along a parting line of said side mold halves, said sole plate being provided with a supply duct extending longitudinally therein and having at least one injection port leading from said supply duct to the mold cavity, and said sole plate further having an air venting duct of small dimensions located between said supply duct and the atmosphere, said venting duct being sized so that any material to be injected through said at least one injection port which enters said venting duct will solidify, by virtue of the rapid contact-cooling, to a sprue of such shape that it can be removed together with and attached to a supply duct sprue, said air venting duct of small dimensions being constituted by an annular clearance between the supply duct and a plug in the supply duct, with said plug having vent holes between said clearance and atmosphere.
Claim 5
Independent Claim
207 words
An apparatus for molding two-component footwear soles either loose or attached during the molding to an upper comprising, two side mold halves and a sole plate defining at least in part a mold cavity, means mounting said side mold halves and said sole plate for relative vertical displacement, said side mold halves having recesses which define a supply duct for said cavity along a parting line of said side mold halves, said sole plate being provided with a supply duct extending longitudinally therein and having at least one injection port leading from said supply duct to the mold cavity, and said sole plate further having an air venting duct of small dimensions located between said supply duct and the atmosphere, said venting duct being sized so that any material to be injected through said at least one injection port which enters said venting duct will solidify, by virtue of the rapid contact-cooling, to a sprue of such shape that it can be removed together with and attached to a supply duct sprue, said air venting duct of small dimensions being constituted by an annular clearance between the supply duct and a plug in the supply duct, with said plug having vent holes between said clearance and atmosphere.
Claim 6
Dependent Claim
15 words
The apparatus as claimed in claim 1 in which said annular clearance is tapered inwards.
Claim 7
Dependent Claim
15 words
The apparatus as claimed in claim 1 in which said annular clearance is stepped inwards.
Claim 8
Independent Claim
203 words
An apparatus for molding two-component plastic articles, comprising, at least two mold parts defining at least in part a mold cavity, means mounting said mold parts for relative movement to define mold cavities of different size, means defining a first supply duct to the smaller of said mold cavities, one of said mold parts having therein a separate, second supply duct extending to the larger of said mold cavities, means defining at least one injection port having an outlet end and an inlet end, said injection port connecting said second supply duct to said larger cavity, and within said injection port shaped to hold a solidified injection port sprue whereby said sprue breaks at the mold internal surface as a molded article is removed from said surface, and to retain at least a part of said injection port sprue within an outlet end of the injection port as a sealing plug when a solidified second supply duct sprue is removed, and said communicating means being a perforated plate lying between the outlet end and the inlet end, with the perforations allowing supply of injection material but preventing the solidified material in the outlet end being removed if the sprue in the inlet end.
Claim 9
Independent Claim
203 words
An apparatus for molding two-component plastic articles, comprising, at least two mold parts defining at least in part a mold cavity, means mounting said mold parts for relative movement to define mold cavities of different size, means defining a first supply duct to the smaller of said mold cavities, one of said mold parts having therein a separate, second supply duct extending to the larger of said mold cavities, means defining at least one injection port having an outlet end and an inlet end, said injection port connecting said second supply duct to said larger cavity, and within said injection port shaped to hold a solidified injection port sprue whereby said sprue breaks at the mold internal surface as a molded article is removed from said surface, and to retain at least a part of said injection port sprue within an outlet end of the injection port as a sealing plug when a solidified second supply duct sprue is removed, and said communicating means being a perforated plate lying between the outlet end and the inlet end, with the perforations allowing supply of injection material but preventing the solidified material in the outlet end being removed if the sprue in the inlet end.
Claim 10
Independent Claim
209 words
An apparatus for molding footwEar, soles, either as loose soles or attached to an upper comprising, two side mold halves and a sole plate defining at least in part a mold cavity, means mounting said side mold halves and said sole plate for relative vertical displacement, means defining a supply duct for said mold cavity to supply a first molding component, said sole plate having a longitudinal supply duct and at least one injection port having an outlet end and inlet end, said injection port connecting said sole plate supply duct with said mold cavity to supply a second molding component, and communicating means within said injection port shaped to hold a solidified injection port sprue whereby said sprue breaks at the mold internal surface as a molded sole is removed from said surface and to retain at least a part of said injection port sprue within an outlet end of the injection port as a sealing plug when a solidified supply duct sprue is removed, and said communicating means being a perforated plate lying between the outlet end and the inlet end, with the perforations allowing supply of injection material but preventing the solidified material at the outlet end being removed with the sprue in the inlet end.
Claim 11
Independent Claim
209 words
An apparatus for molding footwEar, soles, either as loose soles or attached to an upper comprising, two side mold halves and a sole plate defining at least in part a mold cavity, means mounting said side mold halves and said sole plate for relative vertical displacement, means defining a supply duct for said mold cavity to supply a first molding component, said sole plate having a longitudinal supply duct and at least one injection port having an outlet end and inlet end, said injection port connecting said sole plate supply duct with said mold cavity to supply a second molding component, and communicating means within said injection port shaped to hold a solidified injection port sprue whereby said sprue breaks at the mold internal surface as a molded sole is removed from said surface and to retain at least a part of said injection port sprue within an outlet end of the injection port as a sealing plug when a solidified supply duct sprue is removed, and said communicating means being a perforated plate lying between the outlet end and the inlet end, with the perforations allowing supply of injection material but preventing the solidified material at the outlet end being removed with the sprue in the inlet end.
Claim 12
Dependent Claim
62 words
The apparatus as claimed in claim 6 in which said communicating means is defined by a conical recess with its apex downwards beneath the outlet end of the injection port and two cylindrical channels parallel to the axis of and intersecting said recess to define edges, and outwardly flared ends for said channels at the ends thereof remote from the conical recess.
Claim 13
Dependent Claim
74 words
The apparatus as claimed in claim 6 in which said communicating means includes a metallic member inserted between the supply duct and the outlet end of the injection port, said member having a conical recess with its apex downwards beneath the injection port, two cylindrical channels parallel to the axis of and intersecting said recess to define edges, and outwardly flared ends for said channels at the ends thereof remote from the conical recess.
Claim 14
Dependent Claim
85 words
The apparatus as claimed in claim 6 in which said communicating means includes a metallic member constituting a part of the supply duct and having a portion located below the outlet end of the injection port, said portion having a conical recess with its apex downwards beneath the outlet end of the injection port, two cylindrical channels parallel to the axis of and intersecting said recess to define edges, and outwardly flared ends for said channels at the ends thereof remote from the conical recess.
Claim 15
Dependent Claim
47 words
The apparatus as claimed in claim 6 in which said communicating means includes an obstruction extending across said outlet end of said injection port to prevent a plug in said outlet being removed downwardly, and at least one communicating channel past said obstruction to said supply duct.
Claim 16
Independent Claim
207 words
An apparatus for molding two-component plastic articles, comprising, at least two mold parts defining at least in part a mold cavity, means mounting said mold parts for relative movement to define mold cavities of different size, means defining a first supply duct to the smaller of said mold cavities, one of said mold parts having therein a separate, second supply duct extending to the larger of said mold cavities, means defining at least one injection port connecting said second supply duct to said larger cavity, and communication means within said injection port to hold a solidified injection port sprue whereby said sprue breaks at the mold internal surface as a molded article is removed from said surface, and to retain at least a part of said injection port sprue within an outlet end of the injection port as a sealing plug when a solidified second supply duct sprue is removed, the injection port being defined by two similar and successive frustoconical portions with each portion converging upwardly, with the upper portion constituting the outlet end with its smaller end constituting an outlet orifice and the lower portion joining the upper to provide an inwardly projecting ring surface And constituting a communicating channel to the second supply duct.
Claim 17
Independent Claim
207 words
An apparatus for molding two-component plastic articles, comprising, at least two mold parts defining at least in part a mold cavity, means mounting said mold parts for relative movement to define mold cavities of different size, means defining a first supply duct to the smaller of said mold cavities, one of said mold parts having therein a separate, second supply duct extending to the larger of said mold cavities, means defining at least one injection port connecting said second supply duct to said larger cavity, and communication means within said injection port to hold a solidified injection port sprue whereby said sprue breaks at the mold internal surface as a molded article is removed from said surface, and to retain at least a part of said injection port sprue within an outlet end of the injection port as a sealing plug when a solidified second supply duct sprue is removed, the injection port being defined by two similar and successive frustoconical portions with each portion converging upwardly, with the upper portion constituting the outlet end with its smaller end constituting an outlet orifice and the lower portion joining the upper to provide an inwardly projecting ring surface And constituting a communicating channel to the second supply duct.
Claim 18
Dependent Claim
85 words
The apparatus as claimed in claim 7 in which the injection port is defined by an outlet end bored in the sole plate, and a transverse cylindrical member extends within the sole plate, said member having a first diametral hole to constitute a continuation of the supply duct and a second, radial hole as a communicating channel between said diametral hole and said outlet end, and said cylindrical member having a conical recess where the outlet end of the injection port meets said radial hole.
Claim 19
Dependent Claim
56 words
The apparatus as claimed in claim 6 in which the injection port is provided with an outlet end with parallel walls, a frusto-conical portion below said outlet end, with its smaller end upwards, and at least one channel not in alignment with said outlet end connecting the base of said frusto-conical portion with the supply duct.
Claim 20
Dependent Claim
40 words
The apparatus as claimed in claim 6 in which the injection port is provided with an outlet end with parallel walls, at least one channel not in alignment with the outlet end connecting the outlet end with the supply duct.
Claim 21
Dependent Claim
40 words
The apparatus as claimed in claim 6 in which the injection port is provided with an internally threaded outlet end, and a channel of smaller diameter than that of the outlet end connecting said outlet end with the supply duct.
Claim 22
Dependent Claim
46 words
The apparatus as claimed in claim 6 in which the injection port is provided with a slot on the molding face, a cylindrical hole beneath, parallel to, and communicating with said slot along its length, and a channel connecting said cylindrical hole with said supply duct.
Claim 23
Independent Claim
221 words
An apparatus for molding two-component plastic articles, comprising, at least two mold parts defining at least in part a mold cavity, means mounting said mold parts for relative movement to define mold cavities of different size, means defining a first supply duct to the smaller of said mold cavities, one of said mold parts having therein a separate, second supply duct extending to the larger of said mold cavities, means defining at least one injection port connecting said second supply duct to said larger cavity, and communication means within said injection port to hold a solidified injection port sprue whereby said sprue breaks at the mold internal surface as a molded article is removed from said surface, and to retain at least a part of said injection port sprue within an outlet end of the injection port as a sealing plug when a solidified second supply duct sprue is removed, said injection port being defined by two similar and successive frustoconical portions with each portion converging upwardly, with the upper portion constituting the outlet end with its smaller end constituting an outlet orifice and the lower portion joining the upper to provide an inwardly projecting ring surface and constituting a communicating channel to the second supply duct and at least said lower similar and successive frustoconical portion is in an insert.
Claim 24
Independent Claim
221 words
An apparatus for molding two-component plastic articles, comprising, at least two mold parts defining at least in part a mold cavity, means mounting said mold parts for relative movement to define mold cavities of different size, means defining a first supply duct to the smaller of said mold cavities, one of said mold parts having therein a separate, second supply duct extending to the larger of said mold cavities, means defining at least one injection port connecting said second supply duct to said larger cavity, and communication means within said injection port to hold a solidified injection port sprue whereby said sprue breaks at the mold internal surface as a molded article is removed from said surface, and to retain at least a part of said injection port sprue within an outlet end of the injection port as a sealing plug when a solidified second supply duct sprue is removed, said injection port being defined by two similar and successive frustoconical portions with each portion converging upwardly, with the upper portion constituting the outlet end with its smaller end constituting an outlet orifice and the lower portion joining the upper to provide an inwardly projecting ring surface and constituting a communicating channel to the second supply duct and at least said lower similar and successive frustoconical portion is in an insert.
Claim 25
Dependent Claim
22 words
The apparatus as claimed in claim 8 wherein said insert contains said lower and upper frustoconical portions and said second supply duct.
Claim 26
Independent Claim
234 words
An apparatus for molding two-component plastic articles, comprising, at least two mold parts defining at least in part a mold cavity, means mounting said mold parts for relative movement to define mold cavities of different size, means defining a first supply duct to the smaller of said mold cavities, one of said mold parts having therein a separate, second supply duct extending to the larger of said mold cavities, means defining at least one injection port connecting said second supply duct to said larger cavity, and communication means within said injection port to hold a solidified injection port sprue whereby said sprue breaks at the mold internal surface as a molded article is removed from said surface, and to retain at least a part of said injection port sprue within an outlet end of the injection port as a sealing plug when a solidified second supply ducT sprue is removed, said injection port being defined by two similar and successive frustoconical portions with each portion converging upwardly, with the upper portion constituting the outlet end with its smaller end constituting an outlet orifice and the lower portion joining the upper to provide an inwardly projecting ring surface and constituting a communicating channel to the second supply duct and said inwardly projecting ring surface being inclined from a line normal to the axis of said upper and lower frustoconical portions toward said second supply duct.
Claim 27
Independent Claim
234 words
An apparatus for molding two-component plastic articles, comprising, at least two mold parts defining at least in part a mold cavity, means mounting said mold parts for relative movement to define mold cavities of different size, means defining a first supply duct to the smaller of said mold cavities, one of said mold parts having therein a separate, second supply duct extending to the larger of said mold cavities, means defining at least one injection port connecting said second supply duct to said larger cavity, and communication means within said injection port to hold a solidified injection port sprue whereby said sprue breaks at the mold internal surface as a molded article is removed from said surface, and to retain at least a part of said injection port sprue within an outlet end of the injection port as a sealing plug when a solidified second supply ducT sprue is removed, said injection port being defined by two similar and successive frustoconical portions with each portion converging upwardly, with the upper portion constituting the outlet end with its smaller end constituting an outlet orifice and the lower portion joining the upper to provide an inwardly projecting ring surface and constituting a communicating channel to the second supply duct and said inwardly projecting ring surface being inclined from a line normal to the axis of said upper and lower frustoconical portions toward said second supply duct.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |