US1710891A - Screed support - Google Patents

Description

A April 30, 1929. J. 5. OHARE I SCREED SUPPORT Filed Feb. 10, 1927 L'Q'IIYIIIIIIIIIIIIIIi'IIiI/II'IIII/i/IIIIIJIII/III",

lllllld a! Patented Apr. 30, 1929.

UNITED STATES PATENT OFFICE t JOHN s. orm'ne, or DENVER, COLORADO, AssIGnoR or ONE-HALF '10 Rl'M; AI KEN.

or DENVER, COLORADO.

SCREED SUPPORT.

This invention relates to improvements in means for supporting screeds while constructing concrete floors.

it is now quite common to construct buildiugs entirely of concrete or in which the floors are also made of concrete. The construction of such buildings requires that a form he first constructed of wood or other suitable material for the support and the reception in of the concrete grout. In the construction of concrete floors, a false floor isfirst laid and properly supported. The tie rodsor reinforcing bars are then put into place and supported at a proper height above the top of this floor, after which the concrete grout is poured onto the false floor.

It is, of course, essential that the upper surface of the monolithic concrete floor shall be level and at the proper height. This is attained by first supporting a number of parallel screeds, from the false floor, in such a manner that their upper surfaces lie in the same horizontal plane and which form guides and supports for a straight edge.

The supporting and the adjustment of these screeds, as now done, is very laborious and therefore costly.

It is the object of this invention to produce a simple supporting member resembllng so somewhat a large spike provided with two pointed ends and ahead near one end. These members can be driven into the false floor and adjusted with their heads at such a height above the upper surface of the false floor that, when the screeds are driven onto the upper sharpened ends until their lower surfaces come into contact with the upper surface of the heads, the upper surfaces of the screeds will lie in a plane which is at the level for the upper surface of the concrete floor.

The above object and others that may become apparent as the description proceeds are attained by means which will now be described in detail, reference for this purpose being had to the accompanying drawing in which the invention has been illustrated and Fig. 2 is a section taken on line 2-2,

Fig. 1;

Fig. 3 is a section to an enlargedscale taken.

on line 3 3, Fig.1. a

Fig. 4 is a side elevation of my improved screed supporting niembery; Fig. 5 is a section taken on line 5 5, Fig. 4;

Fig. 6 is a section taken on line 6-43, F lg.

4; and a a Fig. 7 1s a vlew, partly in elevation and partly in section, showing an anvil appliedto the sharpened upper end duringthe driv- 111g of the sup ort. i In the drawing numeral 1 designates the false floor which maybe of plank or boards, and'wluch is supported on crossbeams 2 that in turn are supported on posts: 3. If columns .are desired, proper boxes are provided. Re? enforcing bars 5 are put in place and held the proper distance above the upper surface of the false floor by some; suitable supporting means 6. For the purpose'of determining the thickness of the concrete and for leveling the upper surface thereof, screeds 7 must be supported at spaced intervals and in substan tially parallel relation. The upper surfaces of screeds 7 must be so adjusted that they lie in the plane of the upper surface ofthe con crete floor slab 8. For the purpose of en porting these screeds I have provided a novelhpike or pin 9 which forms thesubject of this invention and which comprises a cylindrical "iron rod having one end pointed; as indicated by numeral 10. Near the other pointed end 11 is an enlargement 12 which corresponds to the head of an,ordinary spike. .The end 11 which extends upwardly from the head 12 is preferably of a smaller cross sectional areathan' the part 9 and tapers to a point. \Vhen the screeds are to be put into place, a number of supports 9 are driven into the falsefloor and aligned. In driving these supports into place it is necessary to protect the pointed end 11 and this is accomplished by applying to the end 11 an anvil 13 which has an axial opening 14 of suflicient length and diameter to receive the end 11 and permit it to rest upon the up per surface of the head 12. The supports are driven into the false floor until the upper surface of the heads 12 are at such a distance from the upper surface of the falsefloor that the upper surface of the screeds will be at the proper height to correspond with the thickness of the concrete, which has been designated by letter (1 (Figs. 1 and 2). If letter i designates the thickness of the screeds, then the" upper surface of the heads 12 must be upper surfaces of the screeds will be straight and lie in a horizontal plane. After the supporting members 9 have been put into place. the screeds are laid on the sharp points of the tips 11 and driven onto these tips until they rest 011 the upper surface of the heads 12. If the screeds are made of soft wood, no difiieulty will be experienced in driving them onto the ends 11, but if the wood very hard it may be necessary to bore small holes at the proper points so as to obviate the danger of driving the supports farther into the false iioor.

After the screeds have been properly placed and adjusted, the concrete grout is poured onto the falsework and tamped down. The level of the upper surface is determined by drawing a straight edge 15 (shown dotted in Fig. 2) along the screeds. After the concrete has set the screeds may be removed and the grooves filled with concrete.

If a wooden floor is to be put on top of the concrete, the screeds may he made of doretail shaped strips, properly spaced and are left so as to serve as nailing strips.

Where it is conteniplated to use a carpet covering, nailing strips may be supported near the walls along all four sides of the room.

From the above description it will be apparent that I have produced a simple support that "an be cheaply made and which can be conveniently put into place and adjusted for the purpose of supporting the gauge screeds and which will tlierefore reduce the cost of laying concrete floors of this type.

Having described the invention what is claimed as new is A member adapted to serve as a support for a screed and as a means for holding the screed in adjusted position with respect to a falsework, said member consisting of a metal rod of uniform cross section having one end sharpened so as to adaptit to be driven into the underside of a screed, and having ashoulder where the sharpened portion joins with the body of the member, the other end of the rod being sharpened so as to adapt it to be driven into a supporting falsework to any extent required to maintain the screed straight regardless of the unequalities of the supporting surface.

In testimony whereof I affix my signature.

JOHN S. OHARE.

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