US3839838A - Bolster chair - Google Patents

Bolster chair Download PDF

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Publication number
US3839838A
US3839838A US00251797A US25179772A US3839838A US 3839838 A US3839838 A US 3839838A US 00251797 A US00251797 A US 00251797A US 25179772 A US25179772 A US 25179772A US 3839838 A US3839838 A US 3839838A
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United States
Prior art keywords
bolster
plastic
sleeve
feet
spacer feet
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Expired - Lifetime
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US00251797A
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English (en)
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S Vigh
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Individual
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Individual
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Publication date
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Publication of US3839838A publication Critical patent/US3839838A/en
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/16—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
    • E04C5/20—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups of material other than metal or with only additional metal parts, e.g. concrete or plastics spacers with metal binding wires

Definitions

  • ABSTRACT A bolster chair particularly for metalwork support in [52] U.S. Cl 52/687, 52/309, 52/740 reinforced concrete but which s not subject to weath- [51] Int. Cl. E04c 5/16 fi g, wherein a steel strengthening o nuous bar is [58] Field of Search 52/677-689, completely enca y a plastic ction which includes 52/515, 727, 309 integral feet of plastic.
  • Locating protruberances may be placed along the length of the plastic section and [56] References Cit d the feet may be triangular, of great stability, with rein- UNITED STATES PATENTS forcing shoulder portions extending longitudinally of 2,312,293 2/1943 Weiss 52 727 x the plast'c Sectlon' 3. 2,992,131 7/1961 Bricknell 52/727 X 1 Claim, 3 Drawing Figures BOLSTER CHAIR This invention relates to supporting members for reinforcing rods in concrete moulding and form work.
  • spacers or chairs are well known in the art, which are fastened, to the mould formwork or metalwork before the concrete is poured, and to the reinforcing rods.
  • Other types of spacers, particularly at the bottoms of moulds or formwork, are attached to the reinforcing metalwork such as by snapping onto a rod and have feet which rest against the formwork.
  • Still other spacers are of the bolster type which form a continuous support for rods fastened transversely to them.
  • Bolster chairs being larger and being required to supply continuous support have to be very much stronger than simple single spacers.
  • simple spacers can be made of plastic material, it is necessary that practical bolster chairs be made of steel.
  • spacers of plastic which are inert to the weather are known, bolster chairs present a very real weathering problem.
  • the exposed metalwork of the bolster chair protrudes to the exterior of the finished reinforced concrete even though the reinforcing rods are properly contained within the concrete mass.
  • These metallic members then provide rust sources which in a short while cause, the untreated surfaces of concrete to look unsightly, and subsequently allow a channel for water ingress to the reinforcing metal structure and subse quent weakening of the entire unit.
  • the consequences of the exposed reinforcing rods again appear.
  • a bolster chair and a method and apparatus for its construction are provided in which a bolster chair for metalwork support comprises a plastic elongated section, plastic feet integrally molded with said section at spaced intervals along said section, said feet including means preventing displacement of said feet both in a longitudinal and in a transverse direction of said rod and a load supporting continuous strengthening bar integrally surrounded by said section rod and enclosed by said plastic.
  • the rod is of strong metal or steel
  • locating protruberances are spaced along the length of the plastic section for locating reinforcing metalwork and the feet comprise triangular wing portions with reinforcing shoulder webs extending longitudinally of the plastic section.
  • FIG. 1 shows a partly sectional perspective view of a section of the finished article
  • FIG. 2 shows a method of formation
  • FIG. 3 shows a side view of one embodiment of the finished article before severing.
  • the bolster chair of FIG. 1 consists of a transverse section 1 for supporting concrete reinforcing metalwork along which locating protrubcrances 2 are arranged suitably at about inch intervals.
  • the rod is supported by a series of feet 3 arranged at convenient positions along the rod typically at 4 /5 or 5 5 inch spacing (with the protruberance spacing mentioned above).
  • the feet comprise triangular wing members 4 integrally moulded with the section 1 and strengthened by shoulder webs 5 extending lomgitudinally of the section 1 and attached to the underside of section 1 and to the faces of the wings 4.
  • a head portion 6 Integrally molded with the wing members 4 is a head portion 6 which provides additional thickness to the section 1 at the point of junction of the feet and also serves as a locating protruberance in conjunction with protruberances 2.
  • a steel rod 10 is integrally enclosed within the section 1.
  • the complete encasing of rod 10 by the plastic provides strong bonding between the plastic and the rod 10, and prevents any exposure of the rod.
  • the overall strength developed provides support for reinforcing bars with little or no deflection of the bolster chair.
  • the lower edges 11 of the wings 4 rest on the formwork in which the concrete is to be cast and since the feet 3 are entirely of a plastic material, no rusting or weathering problems occur.
  • These bolster chairs can be provided in any length, five foot being a commonly acceptable length.
  • the apparatus for manufacturing this bolster is shown in diagrammatic form in FIG. 2 and includes a reel 20 carrying steel rod 21 fed endwise into the working space 23 of a mold 24. Only one half of the mold is shown in the FIG. 2 consisting of a cavity 25 which when mated with anidentical cavity of a second mould half approaching from above the plane of the paper will form an enclosed cavity space into which plastic material can be injected in molten state.
  • the rod 21 isled into the mould space in coaxial position in the central bore 30 at one end by the rollers 22.
  • a suitable conveyor means 31 supports the bottom edge 11 of a previously formed foot.
  • FIG. 3 On embodiment of the finihsed article before severing from the rod 21 is shown in FIG. 3.
  • this embodiment which typically is of five foot length with spacing between feet 3 of about four inches the entire five foot section is moulded with plastic in one action.
  • the mould corresponding to mould 24 of HO. 2 would be of the full five foot length otherwise the process would be the same as described for FIG. 2.
  • the bolster of this invention can be varied in structure by altering spacing of the feet or the locating protruberances 2 and by variation of the size or cross section of the steel rod for special requirements.
  • the feet too may be differently shaped as required.
  • the particular structure described here is simple, strong, economical in the use of both steel and plastic and extremely stable against overturning and displacement.
  • a bolter chair for concrete reinforcing bars comprising a steel bolster bar, a plastic sleeve element molded integrally on the bolster bar and being coextensi ve therewith and completely enclosing the bolster bar, spaced plastic protuberances integrally molded on at least the upper side of said plastic sleeve for use in locating reinforcing bars resting on the bolster chair, and plastic spacer feet integrally molded on said sleeve at longitudinally spaced intervals thereon and depending therefrom, said spacer feet being of equal heights and being of triangular configuration and disposed in planes normal to the bolster bar and sleeve, said spacer feet projecting equidistantly from opposite sides of the bolster bar and having their triangular base edges disposed in a common plane, and shoulder webs molded integrally with the underside of said sleeve and the oposite vertical faces of said triangular spacer feet and lying in a plane perpendicular to the

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
US00251797A 1972-04-04 1972-05-09 Bolster chair Expired - Lifetime US3839838A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA138,845A CA983734A (en) 1972-04-04 1972-04-04 Bolster chair

Publications (1)

Publication Number Publication Date
US3839838A true US3839838A (en) 1974-10-08

Family

ID=4092855

Family Applications (1)

Application Number Title Priority Date Filing Date
US00251797A Expired - Lifetime US3839838A (en) 1972-04-04 1972-05-09 Bolster chair

Country Status (5)

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US (1) US3839838A (show.php)
CA (1) CA983734A (show.php)
DE (1) DE2316874C2 (show.php)
FR (1) FR2179045B1 (show.php)
GB (1) GB1424066A (show.php)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4942714A (en) * 1988-02-05 1990-07-24 Turek Marketing International Rebar and beam bolster, slab and beam bolster upper
US20070011985A1 (en) * 2005-06-24 2007-01-18 Kilby Harold J Non metallic rebar support
US7287816B1 (en) 2004-10-01 2007-10-30 Norix Group, Inc. Chair and grouping thereof
USD732928S1 (en) * 2012-12-19 2015-06-30 Meadow Burke, Llc Bolster for supporting rebar
USD733529S1 (en) * 2012-12-19 2015-07-07 Meadow Burke, Llc Rebar bolster
US10604933B1 (en) 2018-11-29 2020-03-31 Inland Concrete Products, Inc. Slab bolster with improved connector system
USD891231S1 (en) 2018-11-29 2020-07-28 Inland Concrete Products, Inc. Slab bolster assembly
US11199006B2 (en) 2018-11-29 2021-12-14 Inland Concrete Products, Inc. Slab bolster with improved connector system

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2312293A (en) * 1939-05-09 1943-02-23 George C Weiss Structural element
US2992131A (en) * 1957-03-21 1961-07-11 Jenolite Ltd Treatment of metal surfaces
US3167882A (en) * 1960-12-14 1965-02-02 Fmc Corp Means for and method of prestressing concrete
US3209509A (en) * 1961-12-05 1965-10-05 Universal Builders Supply Co I Devices for concrete reinforcement
US3488907A (en) * 1966-12-16 1970-01-13 Anders Bertil Aberg Rust protection and distance device for reinforcing rod chairs
US3529392A (en) * 1968-10-11 1970-09-22 Chariot Mfg Co Plastic support bridge for concrete reinforcing rods

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB946004A (en) * 1960-09-16 1964-01-08 Universal Builders Supply Co I Improvements in devices for concrete reinforcement
DE7032938U (de) * 1970-09-03 1971-03-11 Fleischmann Fritz Abstandshalterkorb fuer betonbewehrungen.

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2312293A (en) * 1939-05-09 1943-02-23 George C Weiss Structural element
US2992131A (en) * 1957-03-21 1961-07-11 Jenolite Ltd Treatment of metal surfaces
US3167882A (en) * 1960-12-14 1965-02-02 Fmc Corp Means for and method of prestressing concrete
US3209509A (en) * 1961-12-05 1965-10-05 Universal Builders Supply Co I Devices for concrete reinforcement
US3488907A (en) * 1966-12-16 1970-01-13 Anders Bertil Aberg Rust protection and distance device for reinforcing rod chairs
US3529392A (en) * 1968-10-11 1970-09-22 Chariot Mfg Co Plastic support bridge for concrete reinforcing rods

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4942714A (en) * 1988-02-05 1990-07-24 Turek Marketing International Rebar and beam bolster, slab and beam bolster upper
US7287816B1 (en) 2004-10-01 2007-10-30 Norix Group, Inc. Chair and grouping thereof
US20070011985A1 (en) * 2005-06-24 2007-01-18 Kilby Harold J Non metallic rebar support
US7584585B2 (en) * 2005-06-24 2009-09-08 Kilby Harold J Non metallic rebar support
USD732928S1 (en) * 2012-12-19 2015-06-30 Meadow Burke, Llc Bolster for supporting rebar
USD733529S1 (en) * 2012-12-19 2015-07-07 Meadow Burke, Llc Rebar bolster
US10604933B1 (en) 2018-11-29 2020-03-31 Inland Concrete Products, Inc. Slab bolster with improved connector system
USD891231S1 (en) 2018-11-29 2020-07-28 Inland Concrete Products, Inc. Slab bolster assembly
US11199006B2 (en) 2018-11-29 2021-12-14 Inland Concrete Products, Inc. Slab bolster with improved connector system

Also Published As

Publication number Publication date
DE2316874A1 (de) 1973-10-18
CA983734A (en) 1976-02-17
FR2179045B1 (show.php) 1980-05-23
GB1424066A (en) 1976-02-04
DE2316874C2 (de) 1984-06-07
FR2179045A1 (show.php) 1973-11-16

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