US1790945A - Scbeed sotpoet - Google Patents

Description

Patented Feb. 3, 1931 JOHN s. OHARE, or B'rnUNE, coLoRAno t Y scanne surnomY .Applckzation led November This invention relates to improvements Vin screed supports of the type employed in con-4 nection with the Aconstruction of concrete floors and sidewalks and has reference more particularly to an improved form of screed supports of the type ushown and described in my copending application Serial No. 259,408, filed March 6, 1928. 'l

The use of concrete as the building material for buildings of all kinds israpidly increasing, and it is therefore necessary to pro- A vide special tools so as to facilitate the construction of different' parts thereof.

In the licor constructions of buildings of this type, itis necessary to employ'screeds which must be'carefully levelled and put in place before the concrete is poured, as by this means only can the surface of the floors be made smooth and level. j In the application above referred to, I have shown and described the-screed support comprising U-shaped members having pointed ends and which are secured to an angle iron or a Wooden screed. I have foundthat it is very desirable to be'able to adjust the height of the screed supports so that floor constructions of different thickness can be provided for and so that the screeds can be very easily levelled, regardless of whetherv the `false work on which the floor is moulded is level or not.

, It is the object of thisinvention to produce s screed supports that shall be adjustable and which shall be so constructed that when put in `place theywill hold the screed very rigidly in adjusted position, and which can be readily removed after the floor has `been laid.

The above and other objects which may become apparent as the description proceeds are attained by'means of a'construction vand an arrangement of parts that will now .be described in detail, reference for this purpose being/had to the accompanying drawing in which the preferred embodiment ofl theinvention has been illustrated, and in which:l

A Fig. l is a section through the false work on which a floor is laid and shows one of my improved screeds in place thereon; Y Fig. 2 is a section taken on line 2 2, Fig. l Fig. 3 is a section taken on line 3 3, Fig. 2;

1, 1929. serieu N6. 404,071.

' Fig. 4 is a section similar to that shown in Fig. 2, but shows a slightly modified form of construction y gig. 5 is a section taken on line 5 57 Fig. 4; an i l Fig. ..6 is a transverse sectiony showing a g straight edge applied to the upper surface of two screeds; i

In the drawing numeral l represents the surface on which the concrete slab forming the floor is supported during construction. In the construction of .concret`e building a false Work is usually erected and a support formed by planks 2 is provided for supporting'the concrete duringl construction and While' itis setting. The supporting surface is very dificult to construct. so that it will be perfectly y facev ofthe linishedffloor vmust be perfectly level and must be at ajce'rtain height sov as to correspond with the other floors of the build ing. j

For the purposeof enabling the concrete worker to lay the concrete Hoor slab in such a way that its upper finished surface'rwillbe perfectly level and at the right height, either wooden or metal screeds,rsuch as those indicated by reference numeral 3 are provided. VThese screeds are spaced suitable distances apart and are carefully levelled'and adjusted as ,to height. f It is, of course, evident that some means 'must be provided for supporting these screeds in such a manner that they will remain in adjusted position'during the con-V struction of the floor. Y

This invention relates to the construction of the screed supports which, inthe embodiment shown are formed from channel vironl having two parallel side members 4 'and 5 which'are-connect'ed `at one end by a base V6 soas to form a substantially U-shaped structure. channelison the inside ofthe side members. but the supports would operate even if they were bent in such a mannerthat the channels were to the outside. A number of these U-sliaped.supporting members are secured to the inside of an angular' screed 3 by means of vlevel and at such height that all of the floors A In the preferred embodiment, the

rivets or bolts 7 V4The knumber ofsupports 10U downwardly along the side member 5, the slot in this member usually terminates at the' lower edge of the fiange. Located in the' channel of each of the side members 4 and 5 are bars 9 and 10. These bars are of such i size that they will fit the channel in the side members and the flanges of the channel iron will therefore serve as guides to hold the arms 9 and 10 steady. Bar 9`is preferably provided with three holes 11 which are spaced equidistantly apart and which are adapted to receive clamping bolts 12 that extend through the slot 8 and which are providedfwith nuts 13 that serve to clamp the arm to the side member. It is evident that by loosening the bolts 12 the bar can be moved longitudinally with respectto the side member and that it can be clamped in any desired position. When the support isto be extended toits utmost capacity the lower boltis moved to the upper hole but for ordinary uses the two bolts are located as shown. The lower ends Vof bars 9' and 10 are pointed as indicated by reference numeral 14 in Fig. 1. These pointed portions terminateV in yshoulders 15 that form stops which limit Vthe penetration of these bars into the false worky2. Bar 10 is constructed exactly like bar 9 with the exception that the lower hole 11 is omitted'as it is not necessary on this side of the support for the reason that the slot 8 extends practically the entire length ofside member 4.

InFig. 2 I have shown bars` cured tothe sides of the supportby means of bolts having nuts 13. These'nuts naturally become imbedded in .the concrete and therefore serve to anchor the supportsv and when nuts areV employed in the manner shown, the supports must be removed before the concrete becomes too hard as otherwise it is necessary to chisel part of the concrete away before the supports can be removed.

In Fig. 4 l have shown bolts 12 replaced by screws 16 which have countersunk heads and l have also shown how the slots can be provided with bevel sidesflt that accommodate the inside sides of the heads 16. 'The bars 9 and 10 have threaded openings with which Vthese screws engage and when screws of this type are employed instead of bolts, there are no projections that anchor the supports to the concrete and therefore it is possible to remove them even after the concrete has hardened. For the purpose of preventing the concrete from adhering too strongly to the surfaces of the support the latter may be covered with a thin film of-oil that will 9 and 10 seprevent adhesion between the concrete and the metal surfaces of the support.

Itis only necessary to provide the end supports with points 14 and therefore the intermediate supports have been shown as lacking this element.

Uien the yscreeds are put in place, the height is accurately determined andthe support at one end is adjusted to bring the upper surface of the screen at the exact level desiredf for-the finished floor. supportnhas been adjusted and put in place, the'workmen then adjust the other support, after which the f intermediate supports are adjusted. The construction shown holds the screeds in Vadjusted position and therefore greatly facilitates the use of thesel screeds. After the concrete has been filled in tothe desired thickness, a straight edge like that in= dicated by reference numeral 18 is run back and forth along the upper surfaces of the screeds and this bringsthe surface of the concrete into a plane that coincides-with the upper surfaces of the screed. In' the drawing the twosides ofthe U-shaped supports have been shown parallel and this is the preferred construction as lit permits the supports to be A readily withdrawn'from the concrete.v lt is possible, however', vto spread the sides apart slightly and I therefore do notwant to be limited strictly to havingthe two sides in parallel relation. Y kAlthough these supports are intended primarily for use in laying floors in buldings they can, however, be employed Iin/connection with the laying of sidewalks and other outsidek pavements in which case the bars 9` and 10 are driven into the ground so as to hold the screeds at the proper level. i VIn the drawing the Usshaped support has been shown as formed from channel iron, as this' is believed to be the most suitable for this purpose. It is apparent, however, that ordinary-strap iron can be used, as byemploying two bolts that extend through the slot of each side member, the bars 9 and 10 will be guided quite effectively even if no flanges are present for this purpose. Fromthe abovel description it will heapparent that I' have produced a simple and' substantial screed support than can be read ily adjusted so as to accommodate the screed to floors of different thicknesses, and by means of which the screeds can readily be adjusted so as to lie in a. perfectly level plane even when the supporting surface offthe false work is not level.

Having described the invention what is claimed as new'is:

1. A screed support, comprising an inverted U-shaped member having two spaced substantially parallel sides,"a Yseparate-bar slidably connected witheach side and means for clamping the bars to the sides.

After one end j 2. A screed support, comprising an in-` verted Ueshaped member having two spaced substantially parallel sides, a separate bar slidably connected with each side and means for clamping the bars to the sides, said -bars having pointed ends adapted to be driven 4. A screed supportcomprising, an inverted U-shaped member having two spaced substantially parallel sides, each having a slot extending in the direction of its length, a separate bar adjustably connected with each side, two clamping screws extending through the slot and connected Vwith the bar` for holding the bar in adjusted position.

5. A screed support comprising, an inverted U-shaped member of channel cross section having two spaced, substantiallyy parallel sides, a separate bar located in the ing connecting means comprising a slot inv channel of each side, said bars being longitudinally adjustable, and means for holding the bars in adjusted position. j

6. A screed support comprising, an inverted U-shaped member'of channel cross,

section having two spaced, substantially parallel sides,` a. separate bar located in the channel of each side, said sides and bars havone of said members and two bolts connected with the other member, said bolts passing through the slots and, when tightened, holding the bars in adjusted position with respect to the sides. v

7. A screed support comprising, an inverted U-shaped member adapted to be sef cured to one side of the screed, said member having a. channel extending longitudinally thereof, each of the sides ofsaid member having longitudinally extending slots, a separate bar associated with each slot, said bars lying in the channels and clamping bolts passing through the slots for holding the bars in adjusted position.

In testimony whereof I affix my signature.

l JOHN S. OHARE.

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