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US3790320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary casting machine
Assignee: Armstrong World Industries Inc
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Filing: 1972-02-22
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Granted: 1974-02-05
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Expires: 1992-02-22
Abstract
Abstract The invention contemplates a machine and method whereby rotation of an annular mold is used to develop a homogenous longitudinal and radial distribution of foaming plastic. The foaming plastic is introduced into the mold cavity during mold rotation and, particularly where mold-cavity length substantially exceeds moldcavity diameter, a longitudinal traverse is imparted to the introduction of foaming material during rotation of the mold. The cavity is closed to permit foamed filling of the mold, and a polymerizing cure is effected prior to mold opening and product removal. The particular machine herein described is notable (a) for its ready mechanical release from both inner and outer molding contact with the product, (b) for its inherent adaptability to production of a selected one of a plurality of inner and outer profiles and sizes in the product, and (c) for its safe accommodation of fast-foaming and curing plastics, even for relatively large product diameter or girth.
Inventors
- 👤 C Snelling
- 👤 T Andrews
- 👤 J Weller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:06
CPC Classifications
B; B29; B29C; B29C41/00; B29C41/02; B29C41/04; B29C41/042
Claims Analysis
Total Claims: 41
Claim 1
Independent Claim
162 words
A rotary casting machine for casting foamed-plastic tubular articles, comprising a frame, an elongate inner mold member supported for rotation with respect to said frame and having an elongate bore-defining mold surface, an elongate outer mold member supported for rotation with respect to said frame and in spaced coaxial surrounding relation with said inner mold member, said outer mold member having an elongate bore defining an outermold surface, thereby establishing an annular mold space between said members, a first end-closure wall member carried by one of said members and closing said space at one longitudinal end, a second end-closure wall member carried by one of said members and removably closing said space at the other longitudinal end, one of said wall members having a filler opening in registry with said space and therefore offset from the rotary axis, foamable mold-material supply means having discharge communication with said space via the filler opening, and rotary drive means for one of said mold members.
Claim 2
Dependent Claim
162 words
A rotary casting machine for casting foamed-plastic tubular articles, comprising a frame, an elongate inner mold member supported for rotation with respect to said frame and having an elongate bore-defining mold surface, an elongate outer mold member supported for rotation with respect to said frame and in spaced coaxial surrounding relation with said inner mold member, said outer mold member having an elongate bore defining an outermold surface, thereby establishing an annular mold space between said members, a first end-closure wall member carried by one of said members and closing said space at one longitudinal end, a second end-closure wall member carried by one of said members and removably closing said space at the other longitudinal end, one of said wall members having a filler opening in registry with said space and therefore offset from the rotary axis, foamable mold-material supply means having discharge communication with said space via the filler opening, and rotary drive means for one of said mold members.
Claim 3
Dependent Claim
26 words
The machine of claim 1, and including programmed control means governing a selected program of operation of said supply means and of said rotary drive means.
Claim 4
Dependent Claim
29 words
The machine of claim 1, in which said supply means is longitudinally reciprocably guided by said frame and includes an elongated tubular filling element extending through the filler opening.
Claim 5
Dependent Claim
52 words
The machine of claim 2, in which said supply means includes an elongate tubular filling element extending through the filler opening and longtiudinally selectively positionable in said space, and longitudinal-displacement actuating means for said filling element, said control means synchronizing the displacement of said filling element with the discharge of mold material.
Claim 6
Dependent Claim
31 words
The machine of claim 4, in which the inner limit of displacement of the discharge end of said filling element is short of the wall member opposed to said filling opening.
Claim 7
Dependent Claim
32 words
The machine of claim 5, in which the program of mold-material discharge is terminated prior to achievement of the outer limit of programmed displacement of the discharge end of said filling element.
Claim 8
Dependent Claim
24 words
The machine of claim 1, in which said removable wall member includes selectively operable means securing the same to one of said mold members.
Claim 9
Dependent Claim
20 words
The machine of claim 1, in which said removable wall member includes an articulating support connection to said frame member.
Claim 10
Dependent Claim
19 words
The machine of claim 8, in which said support connection includes a hinge pin on a substantially vertical axis.
Claim 11
Dependent Claim
37 words
The machine of claim 1, in which said inner mold member comprises plural elongate segmental elements and a generally central elongate supporting mandrel within said segmental elements, and retractable connections between said mandrel and said segmental elements.
Claim 12
Dependent Claim
54 words
The machine of claim 10, in which said segmental elements are removaly secured to said retractable connections, whereby said segmental elements may be a matched set determining a selected molded bore which is but one of a plurality of molded bores determined by removable connection of a selected matched set to said retractable connections.
Claim 13
Dependent Claim
22 words
The machine of claim 10, in which said retractable connections comprise a four-bar linkage connection of each segmental element to said mandrel.
Claim 14
Dependent Claim
20 words
The machine of claim 12, in which each such four-bar linkage connection is substantially rectangular in the fully-extended mold-bore-defining position.
Claim 15
Dependent Claim
26 words
The machine of claim 12, in which the plane of opEration of each four-bar linkage connection is substantially aligned with the central axis of said mandrel.
Claim 16
Dependent Claim
28 words
The machine of claim 1, in which one of said mold members is longitudinally slidably supported for axial displacement with respect to the other of said mold members.
Claim 17
Dependent Claim
174 words
A rotary casting machine for casting foamed-plastic tubular articles, comprising a frame, elongate inner mold means supported for rotation with respect to said frame and having a bore-defining outer cylindrical surface, elongate outer mold means supported for rotation with respect to said frame and coaxial with the rotary axis of said inner mold means, said outer mold means having an inner cylindrical surface spaced from the outer surface of said inner mold means, thereby establishing a cylindrical annular mold space between said inner and outer means, a first end-closure wall member carried with one of said mold means for closing said space at one longtiudinal end, a second end-closure wall member removably carried with one of said mold means for removably closing said space at the outer longitudinal end, one of said wall members having a filler opening in registry with said space and therefore offset from the rotary axis, foamable mold-material supply means having discharge communication with said space via the filler opening, and rotary drive means for one of said mold members.
Claim 18
Dependent Claim
174 words
A rotary casting machine for casting foamed-plastic tubular articles, comprising a frame, elongate inner mold means supported for rotation with respect to said frame and having a bore-defining outer cylindrical surface, elongate outer mold means supported for rotation with respect to said frame and coaxial with the rotary axis of said inner mold means, said outer mold means having an inner cylindrical surface spaced from the outer surface of said inner mold means, thereby establishing a cylindrical annular mold space between said inner and outer means, a first end-closure wall member carried with one of said mold means for closing said space at one longtiudinal end, a second end-closure wall member removably carried with one of said mold means for removably closing said space at the outer longitudinal end, one of said wall members having a filler opening in registry with said space and therefore offset from the rotary axis, foamable mold-material supply means having discharge communication with said space via the filler opening, and rotary drive means for one of said mold members.
Claim 19
Dependent Claim
18 words
The machine of claim 16, in which said outer mold means comprises separably securable complimentary elongate segmental elements.
Claim 20
Dependent Claim
13 words
The machine of claim 17, in which said segmental elements are generally semi-cylindrical.
Claim 21
Dependent Claim
44 words
The machine of claim 18, in which said segmental elements are hingedly connected on an elongate axis offset from the rotary axis and at a first pair of adjacent segmental edges, and releasable clamp means connecting adjacent segmental edges remote from said first pair.
Claim 22
Dependent Claim
60 words
The machine of claim 17, in which each segmental element comprises an outer shell member, and an inner cylindrically arcuate mold-defining element removably secured to said outer shell member, whereby selection of one of a plurality of sizes of inner element may enable said machine to produce to a selected one of a plurality of outer diameters of molded product.
Claim 23
Dependent Claim
40 words
The machine of claim 19, in which each segmental element comprises an outer shell member, and an inner cylindrically arcuate mold-defining element removably secured to said outer shell member, said hinged and clamped connections being between said outer shell members.
Claim 24
Dependent Claim
32 words
The machine of claim 16, in which said second end-closure wall member is circular, and frame-based roller means supporting said second wall member at its circular edge for rotation about said axis.
Claim 25
Dependent Claim
36 words
The machine of claim 22, and articulating arm means includes at least one frame-based pivot on a substantially vertical axis and including a supporting journal for rotary support of said second wall member about its axis.
Claim 26
Dependent Claim
16 words
The machine of claim 22, in which the filler opening is in said second wall member.
Claim 27
Dependent Claim
48 words
The machine of claim 16, in which said inner mold means includes a central mandrel rotationally supported by said frame near the end closed by said first wall member, said mandrel including a cantilevered end projecting within said outer mold means and positioning said bore-defining outer cylindrical surface.
Claim 28
Dependent Claim
31 words
The machine of claim 25, in which said bore-defining outer cylindrical surface is defined by outer surfaces of complementary plural cylindrically arcuate elongate segmental members radially retractably carried by said mandrel.
Claim 29
Dependent Claim
64 words
The macine of claim 25, in which said bore-defining outer cylindrical surface is defined by outer surfaces of complementary plural cylindrically arcuate elongate segmental members removably carried by said mandrel, whereby selection of one of a plurality of sizes of complementary sets of such segmental members may enable said machine to produce a selected one of a plurality of inner diameters of molded product.
Claim 30
Dependent Claim
74 words
The machine of claim 25, in which the frame-based rotary support of said mandrel includes elongated guide means for longitudinal reciprocating displacement of said mandrel between (a) a first position in which said bore-defining outer cylindrical surface is within said outer mold means and (b) a secone position in which said bore-defining outer cylindrical surface is projected out that end of said space which is opened by removal of said second end-closure wall member.
Claim 31
Dependent Claim
55 words
The machine of claim 28, in which said bore-defining outer cylindrical surface is defined by outer surfaces of complementary plural cylindrically arcuate elongate segmental members having radially retractable connection to said mandrel, and means responding to longitudinally retracting approach of said mandrel to said first position for actuating said retractable connections to radially expanded position.
Claim 32
Dependent Claim
39 words
The machine of claim 29, in which each of said segmental members is retractably connected by a four-bar linkage to said mandrel, each such linkage acting in a plane which substantially includes the rotary axis of said mold means.
Claim 33
Dependent Claim
47 words
The machine of claim 30, in which said four-bar linkages are extended to substantially rectangular relation for the radially expanded position, said linkages being radially collapsible in the articulating direction in which said segmental members are dragged on the occasion of mandrel displacement toward said second position.
Claim 34
Dependent Claim
34 words
The machine of claim 31, in which for each segmental member a stop coacts between said mandrel and an articulated part of the applicable linkage to prevent linkage collapse in the opposite articulating direction.
Claim 35
Dependent Claim
19 words
The machine of claim 31, and including biased resilient means normally urging each four-bar linkage in the retracting direction.
Claim 36
Dependent Claim
51 words
The machine of claim 31, in which each segmental member interferes with said first end-closure wall member during a longitudinally retracting displacement of said mandrel and just prior to achievement of said first position, whereby continued mandrel retraction to said first position automatically resets said segmental members to radially expanded position.
Claim 37
Dependent Claim
16 words
The machine of claim 1, in which said drive means rotates said mold members in unison.
Claim 38
Dependent Claim
34 words
The machine of claim 1, in which said drive means rotates said mold members at a speed such that the maximum centrifugal acceleration on material in the mold space is less than gravitational acceleration.
Claim 39
Dependent Claim
13 words
The machine of claim 36, in which the axis of rotation is horizontal.
Claim 40
Dependent Claim
186 words
A rotary casting machine, comprising a frame, an elongate inner mole member supported for rotation with respect to said frame and having an elongate bore-defining mold surface, an elongate outer mold member supported for rotation with respect to said frame and in spaced coaxial surrounding relation with said inner mold member, said outer mold member having an elongate bore defining an outer-mold surface, thereby establishing an annular mold space between said members, a first end-closure wall member carried by one of said members for closing said space at one longitudinal end, a second end-closure wall member carried by one of said members and removably closing said space at the other longitudinal end, said removable wall member having an articularing connection to said frame, said connection including means supporting said removable wall member for rotation, whereby said removable wall member may rotate with said mold members when in mold-closing position, one of said wall members having a filler opening in registry with said space, mold-material supply means having discharge communication with said space via the filler opening, and rotary drive means for one of said mole members.
Claim 41
Dependent Claim
186 words
A rotary casting machine, comprising a frame, an elongate inner mole member supported for rotation with respect to said frame and having an elongate bore-defining mold surface, an elongate outer mold member supported for rotation with respect to said frame and in spaced coaxial surrounding relation with said inner mold member, said outer mold member having an elongate bore defining an outer-mold surface, thereby establishing an annular mold space between said members, a first end-closure wall member carried by one of said members for closing said space at one longitudinal end, a second end-closure wall member carried by one of said members and removably closing said space at the other longitudinal end, said removable wall member having an articularing connection to said frame, said connection including means supporting said removable wall member for rotation, whereby said removable wall member may rotate with said mold members when in mold-closing position, one of said wall members having a filler opening in registry with said space, mold-material supply means having discharge communication with said space via the filler opening, and rotary drive means for one of said mole members.
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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) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |