US1541302A - Chair for concrete leveling devices - Google Patents

Description

June-Q, 1925. 1,541,302

W.'E. WHITE CHAIR FOR CONCRETE LEVELING DEVICES- 7 Filed July 31. 1922 Patented June 9, 1925.

unirso STAT PATENT QFFICE.

WILLIAM n. wurrn, or CHICAGO, ILLINOIS, res dues 110 naniuensrunncor, or

onroaeo, rnnrnors, a ee-aroaarron er nsnawaan. I

CHAIR F03 JQNCBETE LEVELI' NG DEVICES.

7 Application filed July 31,

' To all whom it may concern:

Be it known that I, WILLIAM E. XVHITE, a citizen of the United States, and resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in a Chair for Concrete'Leveling Devices, of which the following is a specification.

lvly invention relates to concrete work and particularly to novel apparatus adapted for use in producing level concrete floors or other plane surfaces.

While my invention relates generally to the subject identified, it includes as well, certain details of the devices employed in the novel combination. For example, the wire chair employed is particularly adapted for the use described and is in addition adapted for otheruses where an elevated supporting device is required. The chair here illustrated, possesses many advantages in structural form particularly the advantages incident to the process of manufacture. I employ certain standard machine-made wire shapes which in the proces of manufacture may be differently arranged to provide varying heights and varyingw'idths of bar seats. Y

In the combination here described, the chairs are employed in connection with a flat metal bar which is used as a screed for establishing a certain predetermined plane, the top surface of the bars acting as the leveling surface in connection with a hand operative leveling or surfacing strip. After the concrete has been leveled the bars are removed, the chairs or supports remaining imbedded in the concrete.

The invention will be more readily understood by reference to the accompanying drawing, wherein V Figure 1 is a perspective view of a section of concrete with which my improved combination is associated;

Figure 2 is an enlarged perspective view showing the chair and the screed bar resting thereon;

Figure 3 is a perspective view of the chairwith a different seat-spacing; and

Figure 4 is a fragment of a modified form of cl1air-foot.

In the drawings, it will be seen that the combination is intended to be associated in the relation shown in Figure 1 in which a form is indicated at 10. Chairs of suitable 1922. Serial No. 578,574.

height are placed on the form in proper relation and metal bars 11 are placed on the chairs with the upper surfaces of the bars in the desired finished plane of the concrete which is indicated at 12. Thereafter the concrete, in plastic form, is poured in place and while in that condition is leveled by means of the leveling bar 13 or any suitable straight edge which may slide along the tops of the bars 11. After the concrete has been properly leveled, in order to form a plane surface, the bars 11 are removed, the chairs remaining imbedded in the concrete. After the plastic material has set, the form is removed in the usual manner.

The chairs which constitute a novel element of the invention are preferably formed entirely of wire, the upper portion being identical in all respects with the bar chairs shown in my copending application, Serial No. 567,849, filed June 12, 1922.

Said upper part is composed of duplicate members, each comprising a leg 14, a post 15, and an intermediate horizontal connecting part 16. These duplicate members are arranged in opposed relation with the horizontal parts side by side in parallelism and a U-shaped member consisting of legs 17 and a horizontal part 18 is placed in a vertical plane at right angles to the vertical plane of the duplicate members. The three horizontal parts 16-18, are then welded at their junction. The advantage of this construction is in that the same parts may be employed for securing differentspaces between the posts 15. In the construction shown in Figures 1 and 2, the posts 15 are relatively close together, the space being just sufficient to admit the quarter-inch bar 11, while in the construction of Figure 3 the posts are more widely spaced and will accommodate large reinforcing bars.

The base or lower part of the chairs consists of two U-shaped members, each havinglegs 19, horizontal connecting members 20, an feet 21. The feet may be secured to the form by means of a staple 22 as shown in Figure 3, or the terminal portions of the wires may be bent! downwardly and sharpened to form toes 23 as shown in Figure 4. In the latter case, the sharpened projections are driven into the forms when the chairs are placed.

The U-shaped members are arranged in right angularly disposed planes and the legs 17 of the upper portion of the chair are welded to the horizontal parts 20 of the base. The elevation of the seat between the posts 15 is determined by the point of weld of the legs to the base and it will be seen that a relatively large variation in height may be secured by the use of the same standard parts. Thus I am enabled to vary not only the height of the chair but the width of the seat without the use of other than the parts shown in the drawing.

A chair such as disclosed is stable and rigid, the structural members of the chairs being so disposed as to secure the utmost vertical and lateral strength for the weight of material employed. The parts may all be formed on automatic machines and this would not be possible it a chair of the same height were attempted to be constructed without employing the separate elements composing the base and superstructure of the chair.

The use of the chair in combination with the leveling bars is only one of the various uses to which the chair may be put, but in that combination the chair is particularly valuable; this for the reason that differences in slab thicknesses are very common and chairs which may be utilized in that combination may be easily produced without varying the setting ot' the automatic machines in which the ditlerent parts are formed.

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. In a device of the class described, the

combination of a skeleton chair composed ot' wire and providing a laterally defined seat a rigid bar occupying said seat, the upper surface of the bar being adapted to act as a gauge, for a concrete fill, said bar being held in position by gravity and readily removable therefrom without disturbance ot the fill.

2. A skeleton chair composed of wire and consisting of a base and superstructure, said base being in the form of crossed U-shaped members and said superstructure being in the form of similarly placed U-shaped me1n bers, the legs of the superstructure being welded to the horizontal members of the base. 7

3. A skeleton chair comprising in combi nation a base and a superstructure, said base being in the form of crossed U-shaped members, said superstructure being in the form of similarly crossed U-shaped members pro viding a seat at the top thereof, the legs of the superstructure being welded to the base, the elevation of the seat being determined by the point of weld of the two parts.

at. A chair comprising in combination a bar-supporting portion consisting of duplicate members each including a leg, a post, and a horizontal connecting member, said duplicate members being placed in opposed relation-and a U-shaped member placed at right angles to said associated duplicate members and welded at the junction of the parts, and a base to which the described legs are welded at required elevations.

Signed at Chicago, Illinois, this 12th day of July, 1922.

WILLIAM E. 'VVHITE.

Images