US1955387A - Ready spaced bar chair and pencil rod anchor - Google Patents

Description

A ril 17, 1934. e. s. NELSON READY SPACED BAR CHAIR AND PENCIL ROD ANCHOR Filed May 15. 1931 2 Sheets-Sheet 1 FIG. 4.

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A TTO/(NE V April 17, 1934. G. s. NELSON 1,955,387

READY SPACED BAR CHAIR AND PENCIL ROD ANCHOR Filed May 15. 1931 2 Sheets-Sheet 2 y/vm B Y A TTORNE) vices, or chairs, at properly spaced intervals Patented Apr. 17, 1934 UNITED STATES PATENT QFFWE READY SPACE-D BAR CHAIR AND PENCIL ROD ANCHOR 2 Claims.

This invention relates to chairs for supporting reinforcing rods for concrete, and ties for fixing pencil rods thereto, and has among its objects:

To provide uniformly spaced anchors for pencil rods, where it is desired to attach pencil rods to the bottoms of concrete joists or beams for the purpose of supporting a ceiling;

To provide a protective shield for the tie wires for the pencil rods so that the tie ends will not become embedded in the concrete;

To provide a loop or chair that will be maintained in an upright position so as to become embedded in the concrete of the joist or beam, thereby forming a secure anchor for the tiewires and providing a stable bar chair;

To provide long strips of combination bar chairs and pencil rod anchors that may be rolled up into compact rolls convenient for shipping, and which may be readily placed in position for use in concrete joists or beams.

In the drawings:

Fig. 1 is a transverse section across a strip provided with bar chairs and ties according to the present invention;

Fig. 2 is similar to Fig. 1 except that the chair is double to carry two bars;

Fig. 3 is a plan view of a portion of a strip, showing the regular spacing of the bar chairs on it;

Fig. 4 is similar to Fig. 3 but shows the double chair form;

Fig. 5 shows a roll of the strip provided with the bar chairs;

Fig. 6 shows both the single and the double bar chair embedded in concrete with a pencil rod carried by the ties;

Fig. 7 shows the present invention in place in the forms ready to pour concrete;

Fig. 8 and Fig. 9 show modified forms of the single and double chairs, respectively, with said chairs in elevation;

Figs. 10 and 11 are top plan views of Figs. 8 and 9, respectively;

Figs. 12 and 13 are views showing the forms of Figs. 10 and 11 in position in concrete with pencil rods carried by the ties thereof.

It is the practice, in constructing buildings, bridges, etc., with plastic materials to embed reenforcing bars therein, and to prevent such bars lying in the lower surface thereof from shifting out of position it is necessary to use some device to support such bars above the bottom of the form into which the said materials are poured. Much difilculty is experienced in maintaining such dewhere such chairs are separated and not connected to each other in any way.

Frequently it is desired to support an additional structural unit, such as a ceiling, from the lower surface of the unit formed from such materials, and hence tie wires are embedded in such material to project from the lower surface thereof to aid in securing supporting means for such additional unit, but the present practice of setting separate wires ior this purpose is not satisfactory as such wires become displaced, pull out of the hardened material, etc., and do not effectively serve purpose for which they are intended. The present invention obviates all these difficulties.

A strip 1 preferably of heavy water-proof paper isused as a base towhich are attached, at regular intervals, the bar chairs 2 having a depressed portion to receive the bar 6 and converging legs 3 which pass through apertures in the strip 1, and have their extremities 4 bent substantially at right angles to said legs in opposite directions on the other side of said strip. In the case of the double chairs shown in Fig. 2 a portion 5 is used between the seats for the two bars, said portion being bent down to form additional support for said bars. The said extremities are used as ties to secure the pencil rods 8 to the lower surface of the hardened concrete 7, as shown at 9 and 10 in Fig. 6. The converging legs 3 prevent the paper strip 1 from slipping up on said legs, and the oppositely turned portions 4 give the chairs 2 stability so that they are not displaced by the weight of the bars 6 thereon nor by the movement of the plastic material therearound. It is very apparent that by the use of the present invention that the reenforcing bars 6 will be held so spaced from the forms that said bars will be completely embedded in the concrete, as required by good practice. The strip 1 will prevent the ends 4 and 13 from becoming embedded in the concrete, hence they will be easily accessible i or tying th pencil rods 8 to the joists '7.

Strips 1 will be made of the widths usually used in soilit forms, so that they may be laid on soffits 12 between side forms 11, and all that will be necessary to place them will be to unroll said strips in the forms and tack down the ends. However, if they are used in spaces wider than said strips, the strips will keep the chairs aligned and properly spaced, and several strips may be laid side by side with equally good results as when the one strip is the same width as the said space. The spacing of the chairs 2 will be such that there will be no sagging of the reenforcing bars 6 therebetween, as so frequently happens when separate chairs are placed by hand. The material of which chairs 2 are made is of sufficient size that the said chairs will have the requisite rigidity.

When a furred ceiling is to be attached to the bottoms of concrete beams or joists, a common practice is to insert Wires between soflit forms 12 and side forms 11 by hand, at approximately equal intervals. This is unsatisfactory, however, as each piece of ceiling tie wire is bent and placed by hand and it is practically impossible to get them uniformly spaced, or to get the wires in one joist lined with those in adjacent joists, so that the pencil rods are not straight when attached to said ties and the spacings between the rods will vary considerably. With this invention the ties in all joists can be aligned perfectly and very uniform spacing of the pencil rods thus secured. Further, all tie wires by the present method are securely embedded in the concrete and do not pull out, whereas tie Wires inserted separately as above set forth may lie close along forms 11 or 12 and not be enclosed in the concrete so that they will not be reliable for supporting any weight.

In the modifications shown in Figs. 8-11 the down-bent portion beneath the seats on the chairs for the bars is designated by 14 and is made sufficiently long that it extends through strip 1 and is bent over into a portion 13 which may be bent over the pencil rod 8 to serve as a tie, as shown in Figs. 12 and 13.

Strip 1 is also of value as an insulator between the joist soffit and the ceiling and prevents to a notable degree the streaking which is usually seen in ceilings directly under the joists.

For convenience in handling and shipping the strips 1 may be folded transversely midway of the length thereof, with the chairs 2 on the outside or inside of the folded strip, and then formed into a roll. It will be observed that a much smaller roll results from a given length of strip when so done, as the chairs from two adjacent convolutions of said roll project into the same space from opposite directions.

The setting of the chairs in the strip by machinery, which makes it possible to place said chairs in the forms by merely unrolling the said strip, effects a great saving in labor over placing said chairs by hand, individually, within said forms.

It is not intended to limit this invention to the specific forms shown, since modifications of the devices shown may be adapted for use under various conditions arising in practice and which, it is believed, will suggest themselves upon reading the above specification.

I claim:

1. In a device of the class described, a strip of material, and a reinforcing-bar chair having a portion adapted to serve as a seat for a reinforcing bar and leg portions extending through said strip and having their extremities laterally 100 bent on the other side of said strip, whereby said leg portions are adapted for anchoring pencil rods.

2. A strip of material, and a plurality of bar chairs and pencil rod ties secured thereto in 105 spaced relation, said bar chairs each having portions adapted to serve as a seat for a reinforcing bar, and legs extending thru said strip and laterally bent on the opposite side of said strip, whereby said bent ends of the leg portions are adapted 110 to serve as pencil rod ties.

GEORGE S. NELSON.

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