US1387066A - Means for withdrawing a lining of flexible material from the bore of a conduit - Google Patents

Means for withdrawing a lining of flexible material from the bore of a conduit Download PDF

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Publication number
US1387066A
US1387066A US435407A US43540721A US1387066A US 1387066 A US1387066 A US 1387066A US 435407 A US435407 A US 435407A US 43540721 A US43540721 A US 43540721A US 1387066 A US1387066 A US 1387066A
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United States
Prior art keywords
conduit
lining
bore
withdrawing
flexible material
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Expired - Lifetime
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US435407A
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Thomas E Murray
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Individual
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Priority to US435407A priority Critical patent/US1387066A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B21/00—Methods or machines specially adapted for the production of tubular articles
    • B28B21/86—Cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/34—Moulds, cores, or mandrels of special material, e.g. destructible materials
    • B28B7/342—Moulds, cores, or mandrels of special material, e.g. destructible materials which are at least partially destroyed, e.g. broken, molten, before demoulding; Moulding surfaces or spaces shaped by, or in, the ground, or sand or soil, whether bound or not; Cores consisting at least mainly of sand or soil, whether bound or not

Definitions

  • ipes or conduits are sometimes made by processes which leave within the bore a lining of paper or flexible fabric, which it is afterward desirable to remove.
  • a condition arises, for example, when the conduit is molded from cement or similar plastic material upon a longitudinally removable core-especially when the core :is a wire spiral--inclosed in an envelop or cover of paper which upon the withdrawal of the core, after the cement has hardened, remains in the bore as a lining.
  • This lining not being adherent to the surface of the bore is liable to be detached by a liquid fiow through the conduit, and to be so carried into valves, traps, bendsor smaller branch pipes, where it accumulates and so clogs the passage.
  • present invention is a means for withdraw ing said covering of flexible material longitudinally from the conduit.
  • FIG. 1 is a longitudinal section of a portion of the molded conduit, showing the core, the cover or envelop of flexible material therefor and the inclosing spiral therein.
  • Fig. 2 is a similar view, showing the molded conduit after the withdrawal of the core.
  • the core 1 here shown as a mm or metal strip in spiral form, is applied, preferably by wrapping, a cover 2 of aper or similar flexible sheet material.
  • said covering is wound a spiral wire or metal strip 3.
  • plastic cement or concrete at to form the conduit body.
  • the paper cover now remains in the conduit as a lining, to withdraw which I pull upon one end of the spiral 3, thereby contracting the diameter ofsaid spiral, and also causing it to grip the inclosed cover or lining.
  • the spiral 3 may be easily withdrawn longitudinally from the conduit, bringing the cover 2 with it, and so leaving the conduit bore entirely free. Because the cement is then soft, the end draft on the spiral 3 causes the turns to more or less obliterate any groove in the inner conduit surface which may remain after the removal of said spiral.
  • a conduit molding device comprising a flexible tubular core, and a spiral wire inclosing and engaging said core for withdrawing tHe same longitudinally from the molded conduit.
  • a conduit molding device com rising a core, a cover of flexible material t ereon, and a spiral wire inclosi'ng and engaging said cover for withdrawing the same longitudinally from the molded conduit.

Description

T. E. MURRAY.
MEANS FOR WITHDRAWING A- LINING 0F F LEXIBLE MATERIAL FROM THE BORE OF A comoun.
APPLICATION FILED JAN- 6. I921.
Patented Aug. 9-, 1921.
amwtoz I mamas n. MUY, or BROOKLYN, NEW You.
MEANS roa wrrmaAwme A mm; or rnnxnann MATERIAL mom ran norm or A connurr.
Specification of Letters latent.
Application filed January 6, 1921. Serial No. 435,407.
To all whom it may concern:
Be it known that I, THOMAS E. MURRAY, a citizen of the United States, residin at Brooklyn, in the county of Kings and tate of New York, have invented a certain new and useful Improvement in Means for Withdrawing a Lining of Flexible Material from the Bore of a Conduit, of which the following is a specification.
ipes or conduits are sometimes made by processes which leave within the bore a lining of paper or flexible fabric, which it is afterward desirable to remove. Such a condition arises, for example, when the conduit is molded from cement or similar plastic material upon a longitudinally removable core-especially when the core :is a wire spiral--inclosed in an envelop or cover of paper which upon the withdrawal of the core, after the cement has hardened, remains in the bore as a lining. This lining not being adherent to the surface of the bore is liable to be detached by a liquid fiow through the conduit, and to be so carried into valves, traps, bendsor smaller branch pipes, where it accumulates and so clogs the passage. My
present invention is a means for withdraw ing said covering of flexible material longitudinally from the conduit.
In the accompanying drawing- Figure 1 is a longitudinal section of a portion of the molded conduit, showing the core, the cover or envelop of flexible material therefor and the inclosing spiral therein. Fig. 2 is a similar view, showing the molded conduit after the withdrawal of the core.
Similar numbers of reference indicate like parts.
Upon the core 1, here shown as a mm or metal strip in spiral form, is applied, preferably by wrapping, a cover 2 of aper or similar flexible sheet material. pon said covering is wound a spiral wire or metal strip 3. Upon'the covered and wound core is applied plastic cement or concrete at to form the conduit body. Preferably before the cement has hardened and while although soft, it is capable of retaining its form if unsupported, I withdraw the core 1. The paper cover now remains in the conduit as a lining, to withdraw which I pull upon one end of the spiral 3, thereby contracting the diameter ofsaid spiral, and also causing it to grip the inclosed cover or lining. By reason of this contraction and engagement, the spiral 3 may be easily withdrawn longitudinally from the conduit, bringing the cover 2 with it, and so leaving the conduit bore entirely free. Because the cement is then soft, the end draft on the spiral 3 causes the turns to more or less obliterate any groove in the inner conduit surface which may remain after the removal of said spiral.
I claim: 1
1. A conduit molding device, comprising a flexible tubular core, and a spiral wire inclosing and engaging said core for withdrawing tHe same longitudinally from the molded conduit.
2. A conduit molding device, com rising a core, a cover of flexible material t ereon, and a spiral wire inclosi'ng and engaging said cover for withdrawing the same longitudinally from the molded conduit.
In testimony whereof I have afllxed mysignature in presence of two witnesses.
THUMAS E. MURRAY. Witnesses: GERTRUDE T. Pon'mn, MAY T. MCGARRY.
Patented Aug. 9, 11921.
US435407A 1921-01-06 1921-01-06 Means for withdrawing a lining of flexible material from the bore of a conduit Expired - Lifetime US1387066A (en)

Priority Applications (1)

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US435407A US1387066A (en) 1921-01-06 1921-01-06 Means for withdrawing a lining of flexible material from the bore of a conduit

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US435407A US1387066A (en) 1921-01-06 1921-01-06 Means for withdrawing a lining of flexible material from the bore of a conduit

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2686091A (en) * 1952-02-28 1954-08-10 Mission Mfg Co Pump liner
US2723426A (en) * 1953-02-12 1955-11-15 Beech Aircraft Corp Manufacture of reinforced plastic tubing
US2734262A (en) * 1956-02-14 briegel
US2978781A (en) * 1957-10-28 1961-04-11 Owens Corning Fiberglass Corp Mold expansion and contraction compensating device
US3127702A (en) * 1960-01-12 1964-04-07 Elmer C Karstedt Core and mold units for casting concrete posts and a post formed thereby

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2734262A (en) * 1956-02-14 briegel
US2686091A (en) * 1952-02-28 1954-08-10 Mission Mfg Co Pump liner
US2723426A (en) * 1953-02-12 1955-11-15 Beech Aircraft Corp Manufacture of reinforced plastic tubing
US2978781A (en) * 1957-10-28 1961-04-11 Owens Corning Fiberglass Corp Mold expansion and contraction compensating device
US3127702A (en) * 1960-01-12 1964-04-07 Elmer C Karstedt Core and mold units for casting concrete posts and a post formed thereby

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