US20040261352A1 - Rebar support chair - Google Patents

Rebar support chair Download PDF

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Publication number
US20040261352A1
US20040261352A1 US10/606,498 US60649803A US2004261352A1 US 20040261352 A1 US20040261352 A1 US 20040261352A1 US 60649803 A US60649803 A US 60649803A US 2004261352 A1 US2004261352 A1 US 2004261352A1
Authority
US
United States
Prior art keywords
chair
support legs
receiving area
notches
apertures
Prior art date
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.)
Abandoned
Application number
US10/606,498
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English (en)
Inventor
Clifford Bennett
Kenneth Lee
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.)
Dayton Superior Corp
Original Assignee
Aztec Concrete and Accessories Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Aztec Concrete and Accessories Inc filed Critical Aztec Concrete and Accessories Inc
Priority to US10/606,498 priority Critical patent/US20040261352A1/en
Assigned to AZTEC CONCRETE ACCESSORIES, INC. reassignment AZTEC CONCRETE ACCESSORIES, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BENNETT, CLIFFORD D., LEE, KENNETH LEE
Priority to CA002467951A priority patent/CA2467951A1/en
Priority to MXPA04006317A priority patent/MXPA04006317A/es
Publication of US20040261352A1 publication Critical patent/US20040261352A1/en
Assigned to DAYTON SUPERIOR CORPORATION reassignment DAYTON SUPERIOR CORPORATION MERGER (SEE DOCUMENT FOR DETAILS). Assignors: AZTEC CONCRETE ACCESSORIES, INC.
Assigned to DAYTON SUPERIOR DELAWARE CORPORATION (D/B/A DAYTON SUPERIOR CORPORATION) reassignment DAYTON SUPERIOR DELAWARE CORPORATION (D/B/A DAYTON SUPERIOR CORPORATION) MERGER (SEE DOCUMENT FOR DETAILS). Assignors: DAYTON SUPERIOR CORPORATION
Priority to US11/626,331 priority patent/US20070193189A1/en
Assigned to GENERAL ELECTRIC CAPITAL CORPORATION, AS ADMINISTRATIVE AGENT AND COLLATERAL AGENT reassignment GENERAL ELECTRIC CAPITAL CORPORATION, AS ADMINISTRATIVE AGENT AND COLLATERAL AGENT SECURITY INTEREST PURSUANT TO THE TERM LOAN CREDIT AGREEMENT Assignors: DAYTON SUPERIOR CORPORATION
Assigned to GENERAL ELECTRIC CAPITAL CORPORATION, AS ADMINISTRATIVE AGENT reassignment GENERAL ELECTRIC CAPITAL CORPORATION, AS ADMINISTRATIVE AGENT SECURITY INTEREST PURSUANT TO THE REVOLVING CREDIT AGREEMENT Assignors: DAYTON SUPERIOR CORPORATION
Assigned to DAYTON SUPERIOR CORPORATION reassignment DAYTON SUPERIOR CORPORATION RELEASE OF SECURITY INTEREST RECORDED AT REEL 020593, FRAME 0617 AND REEL 022354, FRAME 0313 Assignors: GENERAL ELECTRIC CAPITAL CORPORATION
Assigned to DAYTON SUPERIOR CORPORATION reassignment DAYTON SUPERIOR CORPORATION RELEASE OF SECURITY INTEREST RECORDED AT REEL 020593 FRAME 0629 Assignors: GENERAL ELECTRIC CAPITAL CORPORATION
Abandoned legal-status Critical Current

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Classifications

    • 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

  • the present invention relates generally to chairs and spacers that are used in construction activities for the support of steel reinforcement members within concrete structures, and in particular to a stackable chair that reliably retains reinforcement bars, post-tension cables, rods, and the like
  • rebar reinforcement bars
  • the rebar is usually arranged in rows or grids within an area into which concrete is to be poured, and are held loosely in place while concrete is placed around them. In normal use, a receiving area formed on the chair will contact and support the rebar while the base of the chair rests on a deck or on a grade.
  • Known prior art chairs have desirable features which provide the proper support of rebar or post-tension cables safely within a concrete structure. Some chairs also have additional desirable features.
  • U.S. Pat. No. 5,729,949 to Hartzheim discloses a readily stackable chair with a hollow-conical body that minimizes the amount of shipping and storage space required. These chairs have support legs with apertures between them to allow concrete to flow into the hollow interior of the chair. A worker can carry many chairs at one time and place numerous chairs at a construction site without repeated trips to a storage area.
  • U.S. Pat. No. 6,089,522 to Haslem et al. discloses a stackable high chair having a lower base portion, an upper connecting portion and an upper support surface.
  • the upper support surface includes bisecting cross members which join opposing corners of the upper support surface. Inclined ramps extend upwardly from the support surface and serve to position the rebar along the upper surface.
  • the upper support surface also includes a plurality of holes which allows a head piece to be mounted to the chair, thereby allowing the height of the chair to be readily adjusted.
  • a generally funnel-shaped support chair having a hollow body with an inner surface, an outer surface, a receiving area, and a base.
  • the base defines a lower opening and is adapted to rest on a planar support surface.
  • the receiving area is adapted to receive and support the rebar.
  • the lower opening of the chair is larger than the receiving area, and the inner and outer surfaces are substantially complementary to each other to allow a plurality of chairs to be stacked within each other for storage and shipment. Additionally, the stacking feature allows a worker to carry a stack of chairs at the job site as he places them at desired locations.
  • the receiving area includes a first and a second pair of curved notches, with the second pair being oriented ninety degrees from the first pair.
  • the first pair of notches has a first depth
  • the second pair of notches has a second depth.
  • the first pair is deeper than the second pair, and the chair is thus able to support rebar at different heights and in perpendicular relationships to one another.
  • the receiving area may optionally include a plurality of bridges.
  • a bridge is a band of material that spans the distance within the body of the chair between each of the pairs of notches. The bridges can assist to further increase the supporting strength of the chair, and can connect the medial, lowest portions, or troughs, of the notches.
  • the base includes a plurality of support legs which define a plurality of apertures, and the apertures allow poured concrete to pass fluidly through the chair.
  • the apertures are preferably arch-shaped, and the support legs preferably have a thickened band of material around the apertures, such that the strength of the chair is reinforced by these thickened areas to allow the support legs to be longer yet retain their strength.
  • the base has four support legs, with two of the support legs further including foot members extending horizontally outwardly therefrom, the other two support legs lacking a foot member. In this embodiment, the foot members extend from support legs which are diametrically opposed from one another.
  • the base includes upper and lower support legs.
  • the lower support legs are the primary set of legs and are larger than the upper support legs.
  • the receiving area is supported by both the upper and lower support legs, with the upper legs extending downwardly from the receiving area, and the lower support legs extending downwardly from the upper support legs.
  • the upper legs can include upwardly extending ribs on their outer surface. These ribs extend along each of the upper support legs between the junction of the lower and upper legs.
  • the chair can be made to be significantly taller than other chairs of the prior art, and also be light in weight yet strong enough to support rebar securely, and without collapsing under the weight of the rebar.
  • the chair is advantageously manufactured as a single piece of material, such that the chair can have the height and strength of a chair having a head piece seated on top of a base chair, yet be a single, tall chair with two sets of support legs.
  • the body of the chair has multiple substantially straight sides and a substantially square cross-section having rounded corners, with an inner surface that is complementary to the outer surface to allow a plurality of chairs to be stacked together, one inside the other, for storage and shipment.
  • the chair may also have an elliptical, oval or hybrid cross-section.
  • the chair preferably has a wide base which is adapted to rest on a flat support surface.
  • the lower opening is defined by the base and is preferably larger than the upper receiving area, and the inner and outer surfaces are preferably substantially complementary to each other.
  • the receiving area and the base are integrally formed together from a durable, non-corrosive polymeric material.
  • the chairs are easy to manufacture in this fashion, and packaging and storage of the chairs can be done quickly and easily because the chairs are also stackable.
  • FIG. 1 is a perspective view of one embodiment of the chair of the present invention
  • FIG. 2 is a perspective view of the chair of FIG. 1 in which rebar has been placed in the receiving area;
  • FIG. 3 is a perspective view of another embodiment of the chair of the present invention having two sets of support legs;
  • FIG. 4 is a perspective view of a plurality of chairs of FIG. 1 stacked within one another in accordance with one aspect of the invention.
  • FIG. 5 is a perspective view of a plurality of chairs of FIG. 3 arranged in a stack.
  • FIG. 1 a perspective view is shown of one embodiment of the chair 8 of the present invention having a hollow body 10 including a base 12 , a receiving area 14 , an inner surface 16 , an outer surface 18 , and ribs 20 formed on the outer surface for a purpose described below.
  • the base 12 defines a lower opening 22 and is adapted to rest on a planar support surface.
  • the receiving area 14 has a plurality of generally rounded notches 24 , with elevated notch junctions 26 between adjacent notches.
  • the lower base 12 has a plurality of separate support legs 32 extending downwardly from the receiving area 14 .
  • Foot members 34 extend radially outward from two opposing support legs 32 .
  • Adjacent support legs 32 define holes or apertures 36 , which allow poured concrete to fluidly pass through the chair 8 .
  • the legs 32 have a thickened band of material 40 around each aperture 36 .
  • the chair of FIG. 1 is preferably generally square in cross-section having rounded corners and is constructed of a single piece of resilient polymeric material. However, alternative embodiments of the chair may have a polygonal, elliptical, oval or hybrid cross-section.
  • the receiving area 14 is adapted to receive and support concrete reinforcement members, or rebar.
  • the inner surface 16 is complementary to the outer surface 18 , and the body 10 has multiple straight sides and is generally tapered, with the lower opening 22 being larger than the receiving area 14 , thereby allowing multiple chairs to be stacked within one another for storage and shipment.
  • the tapered shape of the chair also requires that the upper portion of the body 10 , including the receiving area 14 , is generally relatively narrow as compared to the lower portion, which includes the wider base 12 .
  • Ribs 20 function to space stacked chairs and facilitate their separation.
  • the apertures 36 between the support legs 32 are preferably arch-shaped and allow fluid concrete to pass through the body 10 beneath the level of the receiving area 14 .
  • the large openings provided by the apertures 36 maximize the free flow of concrete into and around chair 8 .
  • the support legs 32 preferably have a thickened band of material 40 around the apertures 36 , such that the strength of the chair is reinforced by these thickened areas 40 to allow the support legs 32 to be longer yet retain their strength.
  • the base 12 has four support legs 32 , with two of the support legs further including foot members 34 extending horizontally outwardly therefrom, the other two support legs lacking a foot member. In FIG. 1, the foot members 34 extend from support legs 32 which are diametrically opposed from one another.
  • FIG. 2 shows reinforcement members 38 and 39 being supported by the chair 8 of FIG. 1.
  • Reinforcement members 38 and 39 intersect with one another within the receiving area 14 .
  • the receiving area 14 includes a first and a second pair of curved notches, 24 a and 24 b , respectively, with the second pair 24 b being oriented ninety degrees from the first pair 24 a .
  • the notches 24 a , 24 b comprise curved bearing surfaces extending inwardly from outer surface 18 .
  • the first pair 24 a are deep notches which receive rebar member 38
  • the second pair of notches 24 b are shallow notches which receive rebar member 39 , such that rebar member 39 is situated above and perpendicular to member 38 within the receiving area 14 .
  • the chair 8 is thus able to support rebar members 38 and 39 both at different heights and in perpendicular relationships to one another.
  • reinforcement member 38 is initially positioned over the receiving area 14 and then lowered into the deep notches 24 a .
  • Reinforcement member 39 is then lowered into the shallow pair of notches 24 b .
  • Notch pairs 24 a are preferably deep enough to allow reinforcement member 38 to sit within the receiving area 14 while also allowing member 39 to sit completely within the shallow notch pairs 24 b without interference from member 38 .
  • FIG. 2 further illustrates the tapered shape of the chair 8 .
  • the upper portion of body 10 is narrow at the receiving area 14 .
  • the body 10 gradually widens from the notch junctions 26 down to the ends of the support legs 32 .
  • the lower opening 22 is therefore much larger in circumference than the receiving area 14 .
  • each support leg 32 proceeds downwardly in a straight line from a junction 26 .
  • two of the support legs 32 have a foot member 34 extending horizontally outwardly therefrom, adding further support to the base such that the base is well adapted to support the weight of the chair 8 as well as the reinforcement members 38 , 39 .
  • FIG. 3 illustrates another embodiment of the chair 108 in which the base 112 includes both lower 132 and upper 133 support legs.
  • the lower support legs 132 are the primary set of legs and are larger and longer than the upper support legs 133 .
  • the receiving area 114 is supported by both the upper and lower support legs 132 , 133 , with the upper legs 133 extending downwardly from the receiving area 114 and defining upper apertures 137 , and the lower support legs 132 extending downwardly from the upper support legs 133 and defining lower apertures 136 .
  • a ledge 142 defines the junction between the upper 133 and lower 132 legs, and can be seen extending around the circumference of the body 110 .
  • the base 112 has four lower support legs 132 , with two of the lower support legs 132 further including foot members 134 extending horizontally outwardly therefrom, the other two lower support legs lacking a foot member.
  • the foot members 134 extend from diametrically opposed lower support legs 132 .
  • Upwardly extending ribs 120 are disposed on outer surface 118 and act as spacers to facilitate separation of stacked chairs, as described above with respect to ribs 20 of FIGS. 1 and 2.
  • the lower and upper apertures 136 , 137 between the lower and upper support legs 132 , 133 , respectively, are preferably arch-shaped and allow fluid concrete to pass through the body 110 beneath the level of the receiving area 114 .
  • the large openings provided by the apertures 136 , 137 maximize the free flow of concrete into and around chair 108 .
  • the lower support legs 132 preferably have a thickened band of material 140 around the lower apertures 136 , such that the strength of the chair is reinforced by these thickened areas 140 to allow the lower support legs 132 to be longer yet retain their strength.
  • the inner surface 116 is complementary to the outer surface 118 , and the body 110 has multiple straight sides and is generally tapered, with the lower opening 122 being larger than the receiving area 114 , thereby allowing multiple chairs to be stacked within one another for storage and shipment.
  • the stackable chairs 108 facilitate handling on a job site, whereby workers may carry a stack of chairs 108 in one hand while placing individual chairs from the stack at desired locations at the job site.
  • the receiving area 114 of FIG. 3 further includes a plurality of bridges 128 .
  • a bridge junction 130 is formed where two bridges 128 meet in the center of the receiving area 114 .
  • the bridges 128 which are shown here but are an optional element of the chair 108 , connect the medial, lowest portions, or troughs, of the notches 124 , and span the distance within the body 110 of the chair between the notches 124 .
  • the bridges 128 assist to further increase the supporting strength of the chair 8 .
  • the bridges 128 which are optional, serve to support the rebar members 138 and 139 as they traverse the body 110 of the chair, and add strength and support to the structure.
  • FIGS. 1 through 3 Apertures are shown in FIGS. 1 through 3 as being generally arch-shaped, curved at the apex.
  • Support legs are generally of sufficient width and strength to support a substantial load, such as the force of the reinforcement members as well as the force applied by construction workers who may step or walk on the reinforcement members during the construction process.
  • the thickened band of material around the apertures also adds strength to the structure, so that the chair does not collapse under such weight.
  • Each foot member allows the base to rest on a flat, planar support surface, including loose or pliant surfaces such as dirt, sand, or the like.
  • a plurality of chairs 8 a and 8 b can be stacked together, one inside the other, for packaging, storage and shipment.
  • the combination of the tapered, generally funnel-like shape of chairs 8 a and 8 b , along with the complementary surfaces, allows the upper receiving area of chair 8 a to be inserted within the lower opening 22 of chair 8 b , such that the outer surface 18 a of the first chair slidably engages the inner surface of the second chair.
  • the distance that a first chair is able to fit inside a second chair is dependant upon the degree of slope assumed by the surfaces 16 and 18 as the body 10 progresses from the receiving area 14 to the lower opening 22 .
  • this slope is sufficient to allow a substantial portion of the first chair to fit within the second chair, such that a great number of chairs can be stacked in a minimal amount of space without the stack becoming too tall or burdensome.
  • ribs 20 space stacked chairs and facilitate their separation.
  • the chairs can be stacked with the foot members of one chair on opposite support legs as the foot members of the preceding chair, or alternatively the foot members can be on the same corresponding support leg, such that a user can recognize a specific corner of the chair. It will be apparent that the stacking capability allows a workman to carry a stack of chairs with one hand as he places chairs at the job site.
  • the chair of the present invention can be made significantly taller than most chairs of the prior art, and also is light in weight yet strong enough to support rebar securely, without collapsing under the weight of the rebar.
  • the chair is advantageously manufactured as a single piece of material, and is constructed from a resilient polymeric material and, more specifically, is constructed of a plastic or resin material.
  • the chair can have the height and strength of a chair with a head piece seated on top of a base chair, yet be a single, tall chair with two sets of support legs.
  • the chair is most preferably made of polypropylene and is one-piece injection molded.
  • polypropylene is one-piece injection molded.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Bridges Or Land Bridges (AREA)
US10/606,498 2003-06-26 2003-06-26 Rebar support chair Abandoned US20040261352A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US10/606,498 US20040261352A1 (en) 2003-06-26 2003-06-26 Rebar support chair
CA002467951A CA2467951A1 (en) 2003-06-26 2004-05-21 Rebar support chair
MXPA04006317A MXPA04006317A (es) 2003-06-26 2004-06-25 Cojinete de soporte para varilla de refuerzo.
US11/626,331 US20070193189A1 (en) 2003-06-26 2007-01-23 Rebar Support Chair

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US10/606,498 US20040261352A1 (en) 2003-06-26 2003-06-26 Rebar support chair

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US11/626,331 Continuation-In-Part US20070193189A1 (en) 2003-06-26 2007-01-23 Rebar Support Chair

Publications (1)

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US20040261352A1 true US20040261352A1 (en) 2004-12-30

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Application Number Title Priority Date Filing Date
US10/606,498 Abandoned US20040261352A1 (en) 2003-06-26 2003-06-26 Rebar support chair

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US (1) US20040261352A1 (es)
CA (1) CA2467951A1 (es)
MX (1) MXPA04006317A (es)

Cited By (33)

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US20060248844A1 (en) * 2005-05-03 2006-11-09 Kodi Jon R Bar clip with flared legs
US20070193189A1 (en) * 2003-06-26 2007-08-23 Dayton Superior Corporation Rebar Support Chair
US20080028718A1 (en) * 2006-08-02 2008-02-07 Erickson John A Stackable rebar support chair
US20080115448A1 (en) * 2006-11-21 2008-05-22 Kodi Jon R Bar Connecting Apparatus
US20080115449A1 (en) * 2006-11-21 2008-05-22 Kodi Jon R Bar Connecting Apparatus
ES2318979A1 (es) * 2006-07-25 2009-05-01 Desarrollos Tecnologicos Del Sur, S Separadores de ferralla para forjados.
US7587872B2 (en) 2007-02-05 2009-09-15 Kodi Klip Corporation Telescoping chair for supporting bars
US20090279945A1 (en) * 2006-06-26 2009-11-12 Brian Rise Snap clamp and possible mounting tool
US20090301025A1 (en) * 2007-02-05 2009-12-10 Kodi Klip Corporation Telescoping Chair For Supporting Bars
US7908723B1 (en) 2005-06-01 2011-03-22 Kodi Klip Corporation Bar clip applicator
WO2011109225A2 (en) * 2010-03-02 2011-09-09 JAB Plastic Products Corporation Supporting rebar with interchangeable crowns
WO2011109226A2 (en) * 2010-03-02 2011-09-09 JAB Plastic Products Corporation Supporting multiple mats
US20120240483A1 (en) * 2008-12-02 2012-09-27 Casne Verige Pty Ltd Chair for a concrete lifting anchor
USD669346S1 (en) * 2009-07-08 2012-10-23 SMCP ApS Pipe and hose clamp
US8322006B1 (en) 2009-04-20 2012-12-04 Kodi Klip Corporation Clip gun with pneumatic feed
AU2006213953B2 (en) * 2006-09-11 2013-09-26 Amarula Pty Ltd A bar chair
US8776328B2 (en) 2010-06-18 2014-07-15 Kodi Klip Corporation Rebar clip for joining different size bars
US20140311081A1 (en) * 2011-08-22 2014-10-23 BIP Company, LLC Multi-function stackable chair for concrete reinforcing elements
US20160153192A1 (en) * 2013-07-15 2016-06-02 Russell Richard Smith Rod clip stand
WO2017007415A1 (en) * 2015-07-08 2017-01-12 Innovativ Plast I Väst Ab Stackable wall spacer for supporting reinforcement in concrete constructions
US9797148B2 (en) 2014-09-05 2017-10-24 Kodi Klip, Llc Clip applying apparatus
USD807729S1 (en) * 2016-08-31 2018-01-16 National Oilwell Varco, L.P. Flowline support device
US20190085562A1 (en) * 2017-09-20 2019-03-21 Ruentex Engineering & Construction Co., Ltd. Jig for making reinforcement cage, method for making assembly of the same and erecting frame
USD889943S1 (en) 2019-01-10 2020-07-14 Southwest Agri-Plastics, Inc. Pipe support
CN113047426A (zh) * 2021-05-18 2021-06-29 中国十九冶集团有限公司 大型混凝土漏斗口的钢筋设置方法
USD941122S1 (en) 2019-07-11 2022-01-18 Southwest Agri-Plastics, Inc. Pipe support
US11280430B2 (en) 2018-07-12 2022-03-22 DuraPlas, LP Pipe support
US11486516B2 (en) * 2018-02-28 2022-11-01 Earth Tek Construction Inc. Concrete pump hose support
USD1019351S1 (en) 2022-08-11 2024-03-26 Inland Concrete Products, Inc. Support chair for poured concrete reinforcement members
USD1027617S1 (en) 2022-06-22 2024-05-21 Inland Concrete Products, Inc. Support chair for poured concrete reinforcement members
USD1031416S1 (en) 2022-06-22 2024-06-18 Inland Concrete Products, Inc. Support chair for poured concrete reinforcement members
USD1033211S1 (en) * 2022-08-11 2024-07-02 Inland Concrete Products, Inc. Support chair for poured concrete reinforcement members
US12049972B2 (en) 2022-10-11 2024-07-30 Cy Richard KACKSTETTER Concrete pump hose support

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