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US3829271A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for molding strip material
Assignee: Individual
•
Filing: 1972-11-02
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Granted: 1974-08-13
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Expires: 1992-11-02
Abstract
Abstract Uncured elastomeric material to be molded into a tire tread is fed progressively from a fixed feed station into a radially outwardly open mold cavity extending partway about the periphery of a cylindrical mold member as the member is rotated about its axis. When charged, the rotation is stopped and one or more mold sections complementary to the member are moved to closed position relative to the cavity and applied under molding pressure. While so applied, the member and sections are heated to cure the molded charge. Upon completion of the curing operation, the mold is opened, the cylndrical mold member rotated, and the molded strip is stripped progressively endwise from the cavity at a fixed discharge station. During stripping, a succeeding charge is fed progressively into the cavity, and, at the end of the stripping step, the operation is repeated. The material may be delivered to the cavity as a prepared strip of raw material at room temperature or extruded directly by an extruder into the cavity at elevated extruding temperature. A plurality of like molds may be arranged to be charged successively from a single extruder so that each mold can be stripped and charged while curing is being effected in the others, thus rendering the production of threads substantially continuous.
Inventors
- 👤 D Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:39
CPC Classifications
B; B29; B29D; B29D30/00; B29D30/06; B29D30/52; Y; Y10; Y10S; Y10S425/00; Y10S425/20; Y10S425/201
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
206 words
A molding apparatus comprising: an inner mold member having an elongated, external, outwardly exposed, curvilinear peripheral molding portion; means supporting the inner member for rotation of said molding portion about its axis; a feeding station and a discharge station, said stations being spaced apart from each other about the axis of curvature; an outer mold member having a molding portion complementary to the peripheral molding portion and defining therewith, when the members are in closed relation, a mold cavity extending endwise peripherally of said axis from the feeding station to the discharge station; means for rotating the inner member in at least one direction while the members are in open position, and for stopping said rotation prior to closing the members; means for progressively feeding a strip of uncured material into said open cavity at the feed station while the inner member is being rotated in said one direction; means for moving the members to closed position for molding the strip while the inner member is stopped, and for opening the members at the end of the curing operation; and means to introduce media into the members so as to subject the material to curing conditions and to cure the material while the members are closed.
Claim 2
Dependent Claim
206 words
A molding apparatus comprising: an inner mold member having an elongated, external, outwardly exposed, curvilinear peripheral molding portion; means supporting the inner member for rotation of said molding portion about its axis; a feeding station and a discharge station, said stations being spaced apart from each other about the axis of curvature; an outer mold member having a molding portion complementary to the peripheral molding portion and defining therewith, when the members are in closed relation, a mold cavity extending endwise peripherally of said axis from the feeding station to the discharge station; means for rotating the inner member in at least one direction while the members are in open position, and for stopping said rotation prior to closing the members; means for progressively feeding a strip of uncured material into said open cavity at the feed station while the inner member is being rotated in said one direction; means for moving the members to closed position for molding the strip while the inner member is stopped, and for opening the members at the end of the curing operation; and means to introduce media into the members so as to subject the material to curing conditions and to cure the material while the members are closed.
Claim 3
Dependent Claim
39 words
The apparatus according to claim 1 wherein stripping means are provided, adjacent the discharge station, for stripping the molded and cured material endwise from the inner mold member progressively as its molding portion passes progressively past said discharge location.
Claim 4
Dependent Claim
78 words
The apparatus according to claim 1 wherein the outer mold member is sectional, and includes at least two sections at opposite sides of said axis and movable in paths relative toward each other and toward the axis of the inner mold member, to closed position, and includes at least one additional section movable toward and away from the periphery of the inner mold member to closed and open positions, respectively, in another path angularly disposed to said paths.
Claim 5
Dependent Claim
169 words
The apparatus according to claim 1 wherein the mold surface of the inner mold member is annular and is at the peripheral surface of the inner member and extends, circumferentially, of said axis; the outer mold member is a sectional mold and includes two sections at opposite sides of the axis and movable in a lineal path to open and closed positions, respectively, relative to the inner mold member and relative to each other; pairs of additional sections are mounted adjacent the said two sections, respectively, the sections of each pair being at opposite ends, respectively, of the associated one of said two sections, and supported for movement therewith along said lineal path and for movement relative thereto transversely of said path to open and closed positions relative to the inner member; and all of said mold sections, when in closed position, define with the inner mold member, a continuous uninterrupted molding cavity extending circumferentially of the inner member from adjacent the feeding station to adjacent the discharge station.
Claim 6
Dependent Claim
116 words
The apparatus according to claim 3 wherein vertical guide means are provided; support means are slidable along the guide means and support the inner member with its axis horizontal and for rotation about its said axis; auxiliary support means are slidable vertically along said guide means and support said two mold sections for independent vertical movement relative to each other and relative to the inner mold member, to open and closed positions, respectively; at least two additional mold sections are provided; and additional support means support the additional mold sections for movement in opposite directions along said vertical path and concurrent movement to open and closed positions, respectively, in paths angularly disposed, to said lineal path.
Claim 7
Dependent Claim
72 words
The apparatus according to claim 5 wherein a press is provided and includes a top plate, a base, vertical strain rods connEcting the top plate and base, and a power driven vertically reciprocable ram; said rods are the guide means for the supports of the inner mold member and for the supporting means of the lineally movable die sections; and all of the mold sections are disposed between the plate and ram.
Claim 8
Dependent Claim
25 words
The apparatus according to claim 5 wherein said additional support means also support the additional mold sections for movement bodily concurrently along said lineal path.
Claim 9
Dependent Claim
35 words
The apparatus according to claim 7 wherein the additional support means connect the additional mold sections to the said two mold sections, at least one additional mold section to each of the two mold sections.
Claim 10
Dependent Claim
116 words
The apparatus according to claim 8 wherein stop means are provided for stopping the movement of the inner mold and said two mold sections, as the ram is moved a predetermined distance away from the plate, so that, in order, one of the two mold sections is moved to spaced relation below the top plate, the inner mold member is moved to spaced relation below, and in open position relative to, said one of said two mold sections; the other of said two mold sections is moved to spaced relation below, and in open relation to, the inner mold member; and the ram is moved to spaced relation below said other of said two mold sections.
Claim 11
Dependent Claim
63 words
The apparatus according to claim 9 wherein said additional mold sections, when in closed position, have their ends juxtaposed against the head plate and ram, respectively, so that the closing pressure is applied by the ram and head plate directly to, and is maintained directly on, said additional mold sections concurrently with the application and maintenance of closing pressure on said two sections.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |