US3768943A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for producing tubular cylindrical bodies of hardenable molding compositions
Assignee: Individual
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Filing: 1971-10-28
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Granted: 1973-10-30
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Expires: 1991-10-28
Abstract
Abstract The apparatus comprises a tubular mold which is rotatably supported on two sets of rollers, each comprising three rollers, which are mutually adjustable to accommodate molds of different diameters. A plurality of endless belts extend axially of the mold in contiguous relation circumferentially of the mold, conforming essentially to the inner generated surface of the mold, and these belts form the surface on which layer-forming components for producing the tubular cylindrical bodies are deposited. As the progressively formed body is withdrawn from the mold, the belts are drawn along with the body. A special supporting arrangement of spaced sets of rollers is provided exteriorly of the mold to support the body as it exits from the mold. Formation of a body is started by initially telescoping a short piece of pipe into the exit end of the mold and depositing the layer-forming components on the inner surface of this piece of pipe.
Inventors
- 👤 H Maihart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:47
CPC Classifications
B; B29; B29C; B29C41/00; B29C41/24; B29C41/26; B29C41/265; B29C41/02; B29C41/04; B29C41/042; B29C41/22; B29C41/34; B29C41/36; B29C41/365; B29K; B29K2105/00; B29K2105/06; B29K2105/12
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
340 words
In apparatus for the production of tubular cylindrical bodies, such as tower or silo walls, pipes, tanks, masts and the like of hardenable molding compositions, wherein a polyester resin or plastic concrete, either alone or with additives such as reinforcing fibers of high strength, is supplied separately to a rotating tubular cylindrical mold and applied in mixture on the inner generated surface of the mold and shaped into a uniform layer of desired wall thickness forming a tubular cylindrical body, after solidification of which the formed body is extracted from the mold, and of the type including a tubular cylindrical mold supported on motor driven roller means for rotation about a horizontal axis and a longitudinally displaceable applicator including applicator elements extending into the interior of the mold, with the applicator having separate supply lines for the fluid molding composition and the additives, but with all supply lines being directed toward a single zone of application on the inner generated surface of the mold: the improvement comprising, in combination, a plurality of endless travelling belts extending longitudinally of said mold and embracing the cylindrical wall thereof, said belts being arranged in laterally contiguous relation throughout the circumference of said mold and being trained about the opposite circular ends of said mold; said belts conjointly forming, in the circumferential direction of said mold, a closed travelling wall oFfering, to the applied tubular cylindrical body layer, a mold wall entrained thereby in the axial direction at the rate of advance of such layer; said longitudinally displaceable applicator including further applicator elements positioned within the interior of the mold at axial spacings from each other and staggered relatively to each other; and at least one feed device spaced from the discharge end of the mold and concentric with the axis of the produced tubular cylindrical body, said feed devices being spaced axially from each other and engaging the solidified portion of the shaped tubular cylindrical body to advance the solidified portion axially along with said travelling wall at a predetermined rate of advance.
Claim 2
Dependent Claim
340 words
In apparatus for the production of tubular cylindrical bodies, such as tower or silo walls, pipes, tanks, masts and the like of hardenable molding compositions, wherein a polyester resin or plastic concrete, either alone or with additives such as reinforcing fibers of high strength, is supplied separately to a rotating tubular cylindrical mold and applied in mixture on the inner generated surface of the mold and shaped into a uniform layer of desired wall thickness forming a tubular cylindrical body, after solidification of which the formed body is extracted from the mold, and of the type including a tubular cylindrical mold supported on motor driven roller means for rotation about a horizontal axis and a longitudinally displaceable applicator including applicator elements extending into the interior of the mold, with the applicator having separate supply lines for the fluid molding composition and the additives, but with all supply lines being directed toward a single zone of application on the inner generated surface of the mold: the improvement comprising, in combination, a plurality of endless travelling belts extending longitudinally of said mold and embracing the cylindrical wall thereof, said belts being arranged in laterally contiguous relation throughout the circumference of said mold and being trained about the opposite circular ends of said mold; said belts conjointly forming, in the circumferential direction of said mold, a closed travelling wall oFfering, to the applied tubular cylindrical body layer, a mold wall entrained thereby in the axial direction at the rate of advance of such layer; said longitudinally displaceable applicator including further applicator elements positioned within the interior of the mold at axial spacings from each other and staggered relatively to each other; and at least one feed device spaced from the discharge end of the mold and concentric with the axis of the produced tubular cylindrical body, said feed devices being spaced axially from each other and engaging the solidified portion of the shaped tubular cylindrical body to advance the solidified portion axially along with said travelling wall at a predetermined rate of advance.
Claim 3
Dependent Claim
31 words
In apparatus for the production of tubular cylindrical bodies, the improvement claimed in claim 1, in which said additional applicator elements include a device for compacting and smoothing the formed layer.
Claim 4
Dependent Claim
103 words
In apparatus for the production of tubular cylindrical bodies, the improvement claimed in claim 1, including a plurality of circumferentially spaced and longitudinally extending supporting ribs extending radially from the external periphery of said mold and engaging races included in said roller means; each supporting rib extending between the backward travelling runs of a respective pair of said belts; the opposite ends of said mold being formed with curvilinearly profiled circumferential ribs extending radially outwardly of said mold, over which said belts are trained; the backward runs of said belts extending, with play, between pairs of adjacent supporting ribs and beneath said races.
Claim 5
Dependent Claim
27 words
In apparatus for the production of tubular cylindrical bodies, the improvement claimed in claim 1, in which the material of said travelling belts is a synthetic resin.
Claim 6
Dependent Claim
40 words
In apparatus for the production of tubular cylindrical bodies, the improvement claimed in claim 1, in which the material of said travelling belts is a material having a high tensile strength and which is surface-coated with a synthetic resin material.
Claim 7
Dependent Claim
74 words
In apparatus for the production of tubular cylindrical bodies, the improvement claimed in claim 1, in which the lateral dimensions of said belts are such that the sum of the belt widths is somewhat greater than the length of the inner circumference of said mold, and the thickness of said belts is sufficiently large that the belts press laterally against each other firmly and hug the internal surface of said mold in vault fashion.
Claim 8
Dependent Claim
39 words
In apparatus for the production of tubular cylindrical bodies, the improvement claimed in claim 1, in which said mold includes a removable segment whereby said endless travelling belts can be slipped easily over the end edges of said mold.
Claim 9
Dependent Claim
172 words
In apparatus for the production of tubular cylindrical bodies, the improvement claimed in claim 1, in which said roller means includes axially spaced races extending circumferentially around the outer periphery of said mold; a stand carrying rolls engaged with said races and driving means for said rolls; the mold being rotatably supported on rolls mounted on bearing housings supported on said standard and spaced circumferentially around a circle concentric with the axis of said mold; said rolls including a bottom roll engaged with each race; motor means operable to drive at least said bottom rolls to rotate said mold; carriages adjustably mounted on said standard and fixable in adjusted position and supporting said bottom rolls; bearing arms pivotally mounted on said standard for pivoting toward and away from said races; means for adjusting and maintaining the pivoted position of said bearing arms; each bearing arm supporting a roll engaged in a respective race; whereby tubular cylindrical molds of different diameters or having different inside clearances may be interchangeably mounted on said standard.
Claim 10
Dependent Claim
98 words
In apparatus for the production of tubular cylindrical bodies, the improvement claimed in claim 1, including a short pipe section telescopable into the Discharge end of said mold in advance of a tubular cylindrical body producing operation and capable of being bound in by the initial layer of the deposited layer-forming material; said pipe section extending outwardly of the discharge end of said mold; said feed devices exerting a high tensile strength on said pipe section and on the formed tubular cylindrical body to advance the tubular cylindrical body axially out of the mold as it is formed.
Claim 11
Dependent Claim
112 words
Apparatus for the production of tubular cylindrical bodies, as claimed in claim 1, in which each feed device comprises a pair of axially spaced annular bearing races supporting a plurality of circumferentially spaced rotatable rolls engageable with the formed tubular cylindrical body; said rolls exerting a preselected frictional pressure on the external surface of the formed tubular cylindrical body; each roll rotating in a diametric plane which extends at an angle to the diametric plane through the formed tubular cylindrical body and through the mold; the angle having a value such that the rolls exert, on the rotating tubular cylindrical body, a screw action effecting axial advance of the tubular cylindrical body.
Claim 12
Dependent Claim
50 words
In apparatus for the production of tubular cylindrical bodies, the improvement claimed in claim 10, in which the angles of the planes of rotation of said rolls with respect to a diametric plane through said mold are adjustable to adjust the rate of advance of the forward tubular cylindrical body.
Claim 13
Dependent Claim
82 words
In apparatus for the production of tubular cylindrical bodies, the improvement claimed in claim 11, including means interconnecting each pair of bearing races against axial displacement; said bearing races being angularly displaceable relative to each other; said rolls being mounted on axles engaged in bearings which are pivotal about articulated axles extending radially of the axis of said bearing races; whereby angular adjustment of said rolls can be effected by a relative angular displacement of the bearing races of the associated pair.
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) | 1976-10-29 | 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 |