US1365125A - Spacing device for reinforcing-bars in concrete - Google Patents

Description

F. H. SCHROEDER, JR. SPACING DEVICE FOR REINFORCING BARS m CONCRETE. APPLICATION FILED APR. 1 l9l9.

1,365,125. Patented Jan. 11,1921.

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Q 4 I 3391; r I 4 a dttomn q UNITED STATES FRED H. SCHROEDER, JR., 0F TACOMA, WASHINGTON.

SPACING DEVICE FOR REINFORCING-BARS IN CONCRETE.

Application filed April 1, 1919.

To all whom it may concern:

Be it known that I, FRED H. SoHRoEnER, J r., a citizen of the United States, and resident of Tacoma, Pierce county, Washington, have invented certain new and useful Improvements in Spacing Devices for Reinforcing-Bars in Concrete, of which the following is a specification.

My invention relates to a spacing device for the reinforcing bars used in concrete work. The object of my invention is to provide a simple type of device which may be used conveniently, and which will be effective in securing accurate and proper placing of the reinforcing rods used in con crete construction.

My invention consists in employing a series of wires or small rods which are provided with means for engaging and securely holding the reinforcing rods at exact distances apart, and also at exact distances from the inner surface of the form or mold in which the concrete is placed.

The particular features of my device which I consider to be new, and upon which I wish protection of a patent, will be hereinafter described and then particularly pointed out by the claims terminating this speci fication. g

In the accompanying drawings I have shown my inventionembodied in the par-- ticular types of construction which I now prefer, and have illustrated certain of the conditions under which it may be advantageously used.

Figure 1 shows, in perspective, a reinforcing rod and the manner of securing the same by the use of my present invention.

Fig. 2 is a side view of a short section of rod, showing in end I view the securing means which are the subject of my invention.

Fig. 3 shows a section through certain portions of a concrete wall and the manner of using my invention to position the reinforcing rods.

Fig. 4 shows, in perspective a manner of securing my device upon a reinforcing rod differing slightly in detail from that shown in Fig. 1.

Fig. 5 is a side view of the same parts showing the same manner of placing them.

Fig. 6 is a section taken transversely of the reinforcing rod, showing a modification Specification of Letters Patent.

Patented Jan. 11, 1921. Serial No. 286,633.

of my invention, in which the supporting leg is made upon the opposite end of the members from that which is shown in Fig. 1.

Flg. 7 is a projection of'the interlocking ends of the spacers as viewed perpendicular to the plane of the reinforcing rod.

In placing reinforclng rods in concrete walls, floors, and the like, it is desirable that means be available for accurately and positively locating them in the desired positions. In some kinds of work, as for instance in reinforcing floors, it is desirable that the reinforcing rods be placed close to the lower surface of the floor slab, but be well embedded therein. The ame condition holds good in many cases where the wall is vertical, although in such work it is oftemdea a sirable that the reinforcing rods be placed centrally of the thickness of the wall.

My invention adapts itself for use in either and both of the above cases. It employs a series of rods, each designed to extend from one reinforcing rod to the next or adjacent rod, and provided at both ends with hooks adapted to engage the rods, and also of such a character that the spacing rods may be interlocked with each other and thus prevent them from being displaced from the reinforcing rods.

In the drawings 1 represents a reinforcing rod and 2 one of the spacing rods. At one end the s acing rods are provided with a hook 20, t e opening of which faces toward the opposite end of the rod. The opening of the hook is of such size as to snugly fit over the reinforcing rod.

At its opposite end the rod 2 is provided with a hook 21 which has its opening facing to one side or transversely of the length of the rod. This fits over the next adjacent reinforcing rod and is of such a size as to snugly embrace the same. At this end of the spacing rod the end of the wire from which it is formed is bent upon itself so as to form a second hook 22, the plane of which is substantially perpendicular to the direction of the length of the spacing rod. At one end of the spacing rod it is rovided with a supporting leg which exten s a distance laterally corresponding to the amount which it is desired the reinforcing rod shall be embedded in the concrete from the surface thereof. As shown in Fig. 1 this supporting leg 23 is shown as an extension of one side of the hook 22. In Fig. 6 the sup porting leg 24- is shown as extending from the end of the hook 20, which is at the opposite end of the spacing rod. Either type of construction may be adopted which is found most desirable.

In using this device the hook 21 is first placed over a reinforcing rod. The opposite end of another one of these spacing rods is then threaded through the hook 22 after the manner shown in Fig. l. The two hooks 21 and 22 together thus entirely surround the reinforcing rod, and the two spacing rods are also interlocked by reason of the fact that the body of one lies within the hook 22 of the other. The relative position of the interlocking portions of the two spacing rods may be such as shown in Figs. 1 and 2, in which the tip 25 lies between the supporting leg 23 and the body of the hook 21, or, as shown in Figs. 4 and 5, in which the tip 25 is placed on the opposite side of a supporting leg 23.

In the great majority of the work the two hooks 20 and 21 at opposite ends of the spaeing rods, would lie in the same plane, which plane includes also the connecting portion of the spacing rod, while the hook 22 will lie in a plane which is at right angles thereto. In some cases it may be desirable to have the two hooks 20 and 21 at opposite ends of a spacing rod, in diiferent planes. One instance of this is shown in Fig. In this case the rod 10 represents a reinforcing rod which is placed in the center of a vertical wall, while the rods 11 indicate reinforcing rods which are placed close to the bottom edge of a floor slab. In this case the spacing rod 2 which connects one of the vertical rods 10 with the adjacent rod 11, has been twisted so as to place the two hooks 20 and 21 in planes which are at right angles with each other. As the spacing rods 2 are made of wire it is an easy matter to twist these as may be desired on the work, and consciquently it will not be necessary to make spacing members of special construction in this respect.

In using spacing rods for use in making floor slabs, the supporting leg 23 will be comparatively short. lVhere, however, the device is to be used in placing rods central in a supporting wall, the supporting legs 23 will be made comparatively long. The difference is well illustrated in Fig. 3, in which the leg of the device used in connection with the vertical rods 10, is much longer than those of the devices used in connection with the floor slab.

By the use of these devices it is possible to accurately locate the reinforcing rods, both in their spacing from each other and in their spacing from the surface of the form. The placing of these spacing rods in place upon the reinforcing rods may be done very rapidly, and this work may be done with less expenditure of time than will even be necessary in securing the rods by other and more common means.

What I claim as my invention is:

A spacing device for reinforcing rods in concrete work, comprising a series of rods, each having, at one end, a back turned portion forming a hook opening toward the opposite end and adapted to receive a reinforcing rod, and at the other end having a downwardly and then upwardly turned portion forming an upwardly opening seat for receiving a reinforcing rod and then turned again downwardly and extended below the said seat to form a leg for supporting this end at a spaced distance from a form member and forming a downwardly opening hook lying in a plane transversely to the plane of the opposite end hook and adapted to receive the sides of the hook of the next spacer in such manner as to lock these ends to the reinforcing rod.

Signed at Tacoma, Washington this 26th day of March 1919.

FRED H. SCHROEDER, JR.

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