US1950343A - Reenforcement for headers and stretchers - Google Patents

Description

March 6, 1934. w. E. WHITE REENFORCEMENT FOR HEADERS AND STRETCHERS Filed Sept. 6, 1930 llllllxllfl.

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l llllllllli Patented Mar. 6, 1934 REENFRCEMENT FOR HEADERS AND STRETCHERS William E. White, Chicago, Ill., assigner to Kalman Steel Company, Chicago, Ill., a corporation of Delaware Application September 6, 1930, Serial No. 480,261

2 Claims.

My invention relates to concrete reenforcement and particularly to novel means for supporting and spacing the reeniorcing required for special concrete structures.

l An object or" my invention is to provide simple and easily constructed means adapted for the required use. It is necessary to provide a suitable structure with which the required reenforcing bars may be associated, such structure being in the form of a cage having a function corresponding to that of the familiar spiral. In certain uses the helically formed cage is satisfactory, but for uses such as those contemplated in the structure we disclose, the spiral cage is pra-ctically valueless; this for the reason that the square form of the ultimate reenforcing structure calls for very accurate bending of the members forming the cage, and the practical certainty that notwithstanding the greatest care, the reenforcing structure when completed will not be straight. That is there will result a rectangular structure in which the bars are not perpendicular to a plane surface intersecting them. This objection is overcome by providing a series of separate rectangular shapes suitably joined by a longitudinal wire member, the separate shapes being formed from a length of wire rod, the ends of the rod being overlapped and unjoined. The separate shapes with the reenforcing rods held in inside angles constitute a .series of stirrups which add materially to the stress resisting capacity of the structure. In View of the nature of the structure the feature of overlapping the ends of the rod avoids the necessity for joining by welding or otherwise. A cage constructed as described may be conveniently shipped and handled and bars assembled with the cage in the eld if desired.

The invention will be more readily understood by reference to the accompanying drawing in which:

Fig. l is a side elevation oi a structure such as contemplated, the reeniorcing bars and ties being shown in dotted lines, and

Fig. 2 is an elevation of the same structure.

In the drawing I have shown the cage as composed of a series of wire rod shapes A, and a longitudinal tie rod B, all preferably composed of approximately 8 gauge wire rod. The shapes are composed of a length of rod substantially greater than the circumferential measurement of the shape, whereby the two ends 10 and 11 are overlapped for a substantial distance. While I have shown the shapes as of rectangular or square outline, it will be obvious that they may be constructed in different outlines if desired. The separate, duplicate shapes A, are joined in properly spaced relation by means of the longitudinal rod B, which is welded to the shapes at a point preferably between the angles.

The reenforcing rods C, are located in the angles of the wire shapes and held in place by means of the light wire ties 12. These ties serve the additional purpose of uniting the overlapped ends of the wire composing the shapes.

A cage or support as described may be cheaply constructed, easily handled and readily adapts itself to the attachment of the reenforcing bars thereto.

Obviously the construction is capable of considerable modification, and I do not Wish to be limited except as indicated in the appended claims.

I claim:

1. A support and spacer of the class described comprising in combination a plurality of separate wire rod shapes each of which is composed of a length of wire rod bent into a circumferentially complete form with overlapped unconnected ends terminating at substantially diametrically opposite points, and a single longitudinally extending rod secured to the separate shapes to space and hold the shapes in proper relation prior to the attachment of bars thereto.

2. A support and spacer for reenforcing bars oi headers and stretchers comprising a plurality of separate wire rod rectangles, each composed of a length of wire rod bent to the required shape with its ends overlapped and terminating adjacent diagonal corners of said rectangle, and a straight length of wire rod to which said rectangles are welded. WILLIAM E. WHITE.

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