US3497174A - Core-former - Google Patents

Core-former Download PDF

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Publication number
US3497174A
US3497174A US618089A US3497174DA US3497174A US 3497174 A US3497174 A US 3497174A US 618089 A US618089 A US 618089A US 3497174D A US3497174D A US 3497174DA US 3497174 A US3497174 A US 3497174A
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United States
Prior art keywords
core
irons
former
shaped elements
core former
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US618089A
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English (en)
Inventor
Tharma Nayagam
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MADAME SUZANNE NAYAGAM NEE PERRIN
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Individual
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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
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/0002—Auxiliary parts or elements of the mould
    • B28B7/0011—Mould seals
    • 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
    • B28B7/28—Cores; Mandrels
    • B28B7/30—Cores; Mandrels adjustable, collapsible, or expanding
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G15/00—Forms or shutterings for making openings, cavities, slits, or channels
    • E04G15/06—Forms or shutterings for making openings, cavities, slits, or channels for cavities or channels in walls of floors, e.g. for making chimneys
    • E04G15/063—Re-usable forms
    • E04G15/065—Re-usable forms with mechanical means to modify the section

Definitions

  • the present invention has for object a core former to form a passage in a construction element of hardening material, said core former comprising two channelshaped elements turned down one on the other with their edges facing each other, with means for separating or bringing together these two shaped elements in the shuttering or dismantling position, and sealing means to close the free space between the longitudinal edges of the shaped elements in the shuttering position.
  • Such core formers are known which make use in particular of a tubular element formed of a steel sheet having a longitudinal slot closed by a removable rubber joint. During shuttering of a passage in a concrete element, this packing is placed in the joint to prevent the concrete from penetrating into the tubular element and to hold apart the two longitudinal edges of this element. During dismantling the rubber joint is withdrawn, which permits of exibly closing the tubular element so as to be able to withdraw it from the hardened concrete. The life of such a core former is limited because it cannot practically be employed more than 500 times. Furthermore, the tubular element being llexible, it is necessary to hold it by outer means to prevent it from warping under the action of the fresh concrete.
  • the present invention aims at overcoming these disadvantages and the core former which is'the object thereof comprises two channel-shaped elements turned down one on the other with their edges facing each other, means for separating or bringing together these two shaped elements ⁇ one from the other in the shuttering or dismantling position and sealing means to close the free space between the longitudinal edges of the shaped elements in the shuttering position.
  • FIGS. 1 and 2 are cross sections of this core former in two different positions.
  • FIGS. 3 and 4 are views similar to FIGS. 2 and l respectively in onelapplication of the core former.
  • FIG. 5 is an end view of this same core former.
  • FIG. 6 is a partial view in side elevation on a smaller scale and partly in axial section of the core former.
  • FIG. 7 is a view of a detail of this core former.
  • FIG. 8 is a diagrammatic view on a still smaller scale of the complete core former.
  • FIG. 9 is an end view of a construction element produced by means of ve core formers such as the one shown in FIG. 8.
  • FIGS. l0 and 1l are sectional views of a variant of a detail of FIGS. 1 and 2, in two different positions.
  • FIGS. l2 and 13 are views in side elevation of two variants of FIG. 7.
  • the core former shown in FIGS. l to 8 serves to form a passage C in a construction element E of concrete such as shown in FIG. 9. It comprises two channel-shaped elements 1 and 2. These two elements 1 and 2 are turned down one on the other with their edges 3, 4 and 5, 6 respectively facing each other. Each edge is rolled over itself inwardly of the shaped element so as to form supports 3', 4 and 5', 6" respectively.
  • the shaped element 1 has on the inside cross ribs 7 regularly spaced along the shaped element, these ribs serving to Areinforce this shaped element and as points for the support of a locking mechanism M disposed inside the shaped elements 1 and 2 and serving to lock these shaped elements in the shuttering position shown in FIGS. 2 and 3 by holding a sealing joint between them as will be described in more detail hereafter.
  • the cross ribs 7 each have inclined edges 7' serving as guiding means for a part of the mechanism M.
  • the shaped element 2 also has inside cross strengthening ribs 8 serving to support the locking mechanism M and comprising in the centre a projection 9 for centering this mechanism.
  • a strap 10 fixed on the shaped element 1 (FIGS. S and 6) at one end of the latter supports a U-shaped handle 11, pivoting at 11 on each side of the strap 10.
  • This handle 11 has bent ends 12 each provided with a pin 13 adapted to enter into contact with the corresponding edge of the shaped element 2.
  • the locking mechanism M shown in side elevation in FIG. 7 comprises two U-irons 14 and 15, turned back to back and connected together by pairs of links 16 distributed at equal distances along these irons. These links 16 are hinged on spindles 17, '18 passing in bosses 19, 20 integral with the irons 14 and 15 respectively.
  • the iron 14 carries at one end a pivoting lever 21 hinged at 22 to a shorter lever 23 connected to the iron 15. These two levers are held in the full line position -by a spring stop schematized at 24.
  • the irons 14 and 15 serve to support sealing joints 25 and 26 respectively (FIGS. 1 to 4) adapted to close the free space between the facing edges 3, 5 and 4, 6 respectively of the shaped elements 1 and 2 as shown in FIGS. 2 and 3.
  • These sealing joints 25, 26 are formed by strips of llexible material, for example foam rubber, mounted on elements 27, 28 fixed to the irons 14 and 15.
  • the core former shown in FIGS. 6 to 8 has an end of reduced section 29 opposite to the one carrying the control handle 11.
  • This end 29 passes through a positioning frame of which one of the sides perpendicular to the axis of the core former is shown in section at 30, and another side parallel to said axis being seen partly at 31.
  • a sealing joint 32 is disposed between the side 30 and the end 29 of reduced section of the device.
  • the positioning frame may receive live core formers such as the one described with a view to producing a construction element having live passages C as shown in FIG. 9.
  • a plate 29 is disposed at the end of the shaped elements 1 and 2 and has for purpose to separate these shaped elements before actuation of the lever 11.
  • the end 29 of reduced section permits of obtaining a larger section in the concrete moulded element, with a view to supporting additional loads.
  • the elements supporting the sealing packing 33 comprise two angle irons 34 and 35 of which one 34 is fixed on a support 36 integral with the iron 14 and the other 35 pivots at 37 on this support 36.
  • the element 35 In the closed position of the joint (FIG. 10), the element 35 is blocked by the edge 3 of the shaped element 1.
  • the locking mechanism is loosened and the iron 14 separates from the support 3, the element 35 rocks and disengages the packing 33 of the joint as shown in FIG. 11.
  • FIG. 12 shows a variant of the locking mechanism M in which one makes use, instead of a working lever, of a screw 38 disposed between a plate 39 integral with the iron 14 and a stop 40 integral with the iron 15. By screwing more or less the nut 41, one separates or one brings nearer in a corresponding manner the irons 14 and 15.
  • the U-irons 14 and 15 are operated by means of a jack with a deformable parallelogram comprising a threaded rod 42 actuated by a handle 43 to move a tapped sleeve 44 carrying two links 45 connected to the irons 14 and 15.
  • Several of these parallelograms may be distributed along the irons 14 and 15.
  • the core former described has the advantage of being strongly built, rigid and of simple operation, capable of being re-employed at least 2000 times. Due to its rigidity it can stand the pressure of the fresh concrete without necessitating special supporting means.
  • a core former for forming a passage in a construction element of hardening material comprising two channel shaped elements turned down one on the other with their longitudinal edges facing each other, means for separating and bringing toward each other said two channel shaped elements in the shuttering or dismantling position, sealing means to close the free space between the longitudinal edges of said channel shaped elements in the shuttering position, said sealing means comprising a locking mechanism having two U-irons turned lback to back and ⁇ extending over the whole length of the channel shaped elements, pairs of links connecting said U-irons, operating means to permit movement of the U-irons one relative to the other, a sealing packing integral with each of said irons to close the space between the longitudinal edges of the channel shaped elements, each of said sealing packings being mounted on two similar elements, one of which is xed on an associated U-iron and the other of which is pivoted to said U-iron.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Moulds, Cores, Or Mandrels (AREA)
US618089A 1966-03-04 1967-02-23 Core-former Expired - Lifetime US3497174A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH317066A CH437735A (fr) 1966-03-04 1966-03-04 Dispositif de coffrage

Publications (1)

Publication Number Publication Date
US3497174A true US3497174A (en) 1970-02-24

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Application Number Title Priority Date Filing Date
US618089A Expired - Lifetime US3497174A (en) 1966-03-04 1967-02-23 Core-former

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US (1) US3497174A (fr)
CH (1) CH437735A (fr)
FR (1) FR1511436A (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3784338A (en) * 1970-04-09 1974-01-08 Pirelli Expansible sector core for curing belts
US4029287A (en) * 1974-09-30 1977-06-14 Burdett Harold D Apparatus for forming modular building structures
US4207052A (en) * 1976-07-16 1980-06-10 Caterpillar Tractor Co. Curing mold for curing replaceable tread and track belts
US4909970A (en) * 1985-02-04 1990-03-20 National Concrete Masonry Association Biaxial concrete masonry casting method

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2453706C2 (de) * 1974-11-13 1982-08-26 WKR Patentverwertungsgesellschaft mbH, 6833 Waghäusel Einstückige Kernschalung zum Herstellen von großflächigen Bauteilen mit Hohlräumen großer Breite
FR2489872A1 (fr) * 1980-09-10 1982-03-12 Mercanton Richard Procede pour la construction de murs en beton arme et materiel pour sa mise en oeuvre
FR2699208B1 (fr) * 1992-12-11 1995-03-24 Rene Anglade Barrière extensible.

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US142746A (en) * 1873-09-09 Improvement in core-barrels for casting
US1000261A (en) * 1910-11-15 1911-08-08 Clarence Thorvald Hansen Collapsible mandrel.
US1027555A (en) * 1910-06-27 1912-05-28 George F Macfarlane Skein-reel.
US1041367A (en) * 1912-01-25 1912-10-15 Martin Stieler Chimney-mold.
US1060188A (en) * 1912-03-27 1913-04-29 Frank B Jacobson Concrete mold and core.
US1112034A (en) * 1912-09-11 1914-09-29 Walter D Ross Core-bar.
US1342208A (en) * 1918-05-08 1920-06-01 Fernelmont Leonard H De Mold for making building-tile
GB266424A (en) * 1925-11-17 1927-02-17 Harold Berridge Improvements in or relating to contractible and expansible supporting means suitable for use in the construction of pipes, tunnels, bridges and other bodies or structures
US2030724A (en) * 1934-12-14 1936-02-11 Fay E Smith Concrete tile mold
US2138693A (en) * 1935-08-26 1938-11-29 Harry R Corwin & Company Inc Contractible removable inner metal cell form
US2507924A (en) * 1947-06-17 1950-05-16 Emery W Morse Collapsible core
US2819511A (en) * 1952-11-26 1958-01-14 Ecrofnier & Partners Ltd Moulding cores
US2969575A (en) * 1958-09-15 1961-01-31 Amplus Inc Apparatus for casting concrete pipe

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US142746A (en) * 1873-09-09 Improvement in core-barrels for casting
US1027555A (en) * 1910-06-27 1912-05-28 George F Macfarlane Skein-reel.
US1000261A (en) * 1910-11-15 1911-08-08 Clarence Thorvald Hansen Collapsible mandrel.
US1041367A (en) * 1912-01-25 1912-10-15 Martin Stieler Chimney-mold.
US1060188A (en) * 1912-03-27 1913-04-29 Frank B Jacobson Concrete mold and core.
US1112034A (en) * 1912-09-11 1914-09-29 Walter D Ross Core-bar.
US1342208A (en) * 1918-05-08 1920-06-01 Fernelmont Leonard H De Mold for making building-tile
GB266424A (en) * 1925-11-17 1927-02-17 Harold Berridge Improvements in or relating to contractible and expansible supporting means suitable for use in the construction of pipes, tunnels, bridges and other bodies or structures
US2030724A (en) * 1934-12-14 1936-02-11 Fay E Smith Concrete tile mold
US2138693A (en) * 1935-08-26 1938-11-29 Harry R Corwin & Company Inc Contractible removable inner metal cell form
US2507924A (en) * 1947-06-17 1950-05-16 Emery W Morse Collapsible core
US2819511A (en) * 1952-11-26 1958-01-14 Ecrofnier & Partners Ltd Moulding cores
US2969575A (en) * 1958-09-15 1961-01-31 Amplus Inc Apparatus for casting concrete pipe

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3784338A (en) * 1970-04-09 1974-01-08 Pirelli Expansible sector core for curing belts
US4029287A (en) * 1974-09-30 1977-06-14 Burdett Harold D Apparatus for forming modular building structures
US4207052A (en) * 1976-07-16 1980-06-10 Caterpillar Tractor Co. Curing mold for curing replaceable tread and track belts
US4909970A (en) * 1985-02-04 1990-03-20 National Concrete Masonry Association Biaxial concrete masonry casting method

Also Published As

Publication number Publication date
FR1511436A (fr) 1968-01-26
CH437735A (fr) 1967-06-15

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