US 1803723 A
Description (OCR text may contain errors)
May 5, 1931. E. N. MURPHY FLOOR CONSTRUCTION Filed July 17" 4 Z 7206222071 -Zfyereit fil Mia/79kg.
Patented May 5, 1931 1' umrisn STATES P TE I 1v. MURPHY, or CHICAGO, ILLINOIS, AssIenoR, BY Mnsnn ASSIGNMENTS, r
'zronns-lvmnvrnnn snLns CORPORATION, A CORPORATION onnnLAwARE FLOOR CONSTRUCTION Application filed July 17,
. construction, and in others of like nature, to
or immediately thereafter.
rest the nailing strip on the concrete floor through the medium of a support embedded in the floor before the concrete has set, that is, either during the pouring of the concrete, The support is provided with upstanding sides, and during the time between embedding the support and securing the nailing strips thereto, these upstanding sides are left exposed .andfsubject to mutilation by negligent and careless Workmen. It often happens that material to be used in the course of construction is hauled to the higher levels of the building and left to lie upon the concrete floor until needed. The use of the floor for this purpose quickly destroys the upstanding flanges, or renders them useless to such an extent that the nailing strips can not be made to align. Another practical difficulty arose in the use of the prior art devices. Having once become rigid- 1y set in the concrete floor, the support could not be adjusted to permit levelingof the nail ing strip, from end to end, and with respect to the adjacent strips: Either wedges or in serts had to be employed, or else the supports could not be used. 7
Briefly, my invention comprises a support which is adapted to besecured to the nailing strip before the latter is placed upon the concrete floor. Thus the obvious diificulties encountered heretofore are overcome, and as a result the support may be positioned-on the floor without first subjecting it to destruction. The nailing strip is laid on the floor with the supports attaohedthereto. Cement is slushed under the supports to build 1924. Serial No. 726,471.
them up to the required level, should the rough concrete floor be unlev'el or irregular. Additional cement is then used to cover pan tially the base of the supports, in order to bond the same to the concrete floor.
The supports are provided with struckup lugs or lips for laterally bracing the nailing strip and for receiving the fastening nails or screws. The lips are offset and oppositely disposed. An advantage is obtained in OK- setting the lips, as a more compact arrangement is obtained, with a maximum engaging surface between the lips and nailing strips.
In additiomthe offset feature affords a lateral grip of greater effectiveness, and provides for economy, as the majority of the material between the lips is utilized in forming the lips. A further important advantage lies in the adaptability of the supports to nailing strips and in overcoming any difficulty "that may be encountered by any irregularity in the nailing strips, such irregularity being denoted by Warped portions, a
variance in thickness, or some other similar defect. l/Vith the lips offset, lips of maximum height may be obtained from a minimum amount of space,t'he space in this instance being equal to the width of the nailing strip.
square. Thus it will be apparent that the lips may be provided with a height equal. to the height of the nailing strip, but as I's'hall hereinafter point out, it is preferable to have the heightgof the lips slightly less than that of the nailing strip, in order to mm,
above mentioned irregularpensate for the ities. I V
In order to obtain a better understand-j Nailing strips are usually ing of the marked advantages obtained through the use of a support embodying my invention, a brief description of the difficulties involved in laying a finishing floor to a concrete floor, infireproof construe tion, will be given. Usually, where steel girders are employed, itmi's customary to build .up the concrete around the girders, causing the floor to assume an arched for mation, which results in a varying thickness in the floor between girders. The lower portion in the center of the arch causes considerable trouble when the finishing floor is laid. If countersunk supports are employed, it is apparent that they are rendered useless at the point where the floor arches; and it has been found that considerable loss is experienced when these supports embedded in the concrete, can not be raised to the required height. It practically involves the substitution of new supports throughout the building, in order to lay the finishing floor at the required level.
In the construction of fire proof buildings, especially those of mammoth size, architects often specify a certain construction which is later changed. Any step taken prior to this time and affected by the change is of course a loss. Permanently laid supports are most always discarded when a change in construction is required. Thus it is apparent that the use of a support, such as I have disclosed herein, eliminates the possibility of such loss.
In order to apprise those skilled in the art how to construct and practice my invention, I shall now describe alternative embodiments thereof, as illustrated in the accompanying drawings which form a part hereof.
In the drawings:
Figure 1 is a fragmentary perspective view of a floor structure embodying my invention;
F ig. 2 is a perspective view of a support, embodying my invention, about to be fastened to a sleeper or nailing strip;
Fig. 3 is a similar view, illustrating these two members fastened;
Fig. 4 is a sectional detail view, illustrating the support resting 011 filling cement to raise the nailing strip to a desired level;
Fig. 5 is a similar view, illustrating cement poured over the base of the support to bond the same;
Fig. 6 is an alternative form of support; and
Fig. 7. is a form of support adapted to be secured to one side of a nailing strip.
Referring more particularly to the drawings, the construction shown comprises a lowor or rough floor 10, which may be of any preferred construction, the form selected for the purposes of illustration, being constructed solely by concrete, although my invention is equally capable of use in wooden, rough floors, and peculiarly adaptable for use in concrete constructions having arched floors. The. finishing floor 11 is carried upon and nailed to a series of transversely extending nailing strips 12; and supports 15, to which my invention is chiefly directed, carry the nailing strips 12 upon the rough floor 10.
The improved form of support 15 shown in Fig. 2, is made preferably of metal and comprises a base 16, which is substantially continuous from edge to edge, to afford a maximum grip between itself and the bonding cement which is poured over a portion thereof, as will be later explained. Base 16 is preferably rectangular, having perforated ends 18, the perforations 19 being provided therein in any number desired. These perforations may be arranged differently from what is shown in the drawings, it being within the scope of this invention to provide slots extending inwardly from the end edges in lieu of the perforations.
Lugs or lips 20 extend upwardly from the center of the support 15, in offset relation, being oppositely disposed so that they will engage each side of the nailing strip 12. It will be noted from Fig. 2 that this nailing strip 12 is adapted to fit between the lips 2-0. Consequently the distance between the lips 20 is preferably equal to the width of the strip. As before pointed out, the strip 12 is generally square in cross section. By offsetting the lips 20, a maximum height may be obtained. As the result of their oppositely disposed relation, the formation of either lip from the material in the base 16 will not interfere with the formation of the other.
The outer edges 21 of the lips 20 are out along a line parallel to the longitudinal edges 22 of the support 15, while the inner edges 23 diverge upwardly and are out along lines parallel to each other, but oblique to the longitudinal edges 22. A separating strip 25 results and serves to reinforce the center of the support 15.
I preferably employ nails 26 for securing the supports to the nailing strips, which nails pass through holes provided in the lips 20.
After the supports 15 are secured to the nailing strips, the latter are laid in place on the rough floor 10. In Fig. l, I have illustrated the support resting upon a layer of cement, which is preferably used to elevate the nailing strip to the proper level when the floor 10 is uneven. If direct engagement'of the support with the rough floor will bring the upper face of the nailing strip to the proper level, this layer of cement is unnecessary. However, in case it does not, the nailing strip is held at the proper level and cement slushed under the base of the support. After the support has been properly set, additional cement may be poured over the ends 18 and allowed to run into the apertures 19, whereupon it becomes bonded to the floor 10. It is, of course, to be understood, that this particular procedure is not necessary in order to secure the support to the rough floor 10, as it may be deemed equally as expedient first to pour cement upon the floor and then to push the support there into until the cement has sufiiciently worked its way around the ends 18 and through the apertures 19, and the desired level has been reached.
In order to compensate for any irregularity in the height of the nailing strip, as herein before set out, the lips 20 are cut so as not to extendthe entire height of the strip. Asindicated at 27 in Fig. 1, a short space is left so that the apex of the lips 20 will never extend beyond the nailing strip and interfere with the finishing floor 11.
In Fig. 5, I have shown a modified form of support. The base thereof is substantially the same as before, while, the lips 20 are slightly different in design. It will be noted that instead of being out individually from the base, they are formed out of a square cut from the center of the base. The width of this square is preferably equal to the width of the nailing strip. In order to shorjen the height of the lips 20 slightly, to compensate for the aforesaid irregularities inthe nailing strip, each lip is cut short of the width of the square with the result that portions 28 remain at one side of the opposite lip.
I also contemplate using my support- 18 in such a manner that it will not embrace both sides of the nailing strip 12. Such a form is illustrated in Fig. 7. The support therein shown has been formed by cutting the support shown in Fig. 6 substantially in half. It is possible of course to form the support shown in Fig. 7 from a single piece.
of material, and not resort first to making the one shown in Fig. 6 and thereafter to cut it in two. In practise this form of support is used by staggering them alternately along both sides of the nailing strip, so that substantially the same eflect is had as in the use of the forms shown in Figs. 2 and 6.
Without further elaboration, the foregoing will so fully explain the gist of my invention, that others may, by applying current knowledge, readily adapt the same for use under varying conditions of service, without eliminating certain features which may properly be said to constitute the essential items of novelty involved, which items are intended to be defined and secured to me by g: the following claims:
I claim 1. In a building floor construction, the combination with upper and lower floors, of a plate-like member resting upon the lower floor and serving as a support for carrying the upper floor, a nailing strip carried by said support, said upper floor adapted to be fastened to said strip, a pair of oppositely disposed offset lugs extending upwardly from said support for engaging opposite sides of said nailing strip,said lugs being formed by incising said support along two lines which are parallel to each other and to the longitudinal sides of the support, then again incising said support obliquely to the parallel lines so that each oblique. incision meets a parallel line, the meeting points constitutin the apexes of triangular portions definedIoy said incisions and the line joining their ends opposite to the apexes, said triangular portions being bent perpendicularly on said joining lines whereby said lugs are formed offset and oppositely disposedand of lengths equal to the distance between them.
2. In a building floor construction, the combination with upper and lower floors and a nailing strip for said upper floor, of a support for carrying said nailing strip upon said lower floor, said support adapted to be fastened to said nailing strip before being laid upon said lower floor whereby any unevenness of the lower floor may be taken up by a filler before the support is thus laid, and a plurality of lips on said support serving to embrace the nailing stripv and to receive the fastening elements for holding the strip to the support, said lips being oppositely disposed and in offset relation.
3. A chair for supporting 'a sleeper, or nailing strip for fire-proof floor construction or the like comprising, in combination, a substantially flat horizontal base portion adapted to be laid on a concrete lower floor after the concrete has set, said base portion supporting the nailing strip and a finishing floor fastened thereto, oppositely disposed off-set lugs bent vertically from said base portion for laterally embracing the vertical sides of said nailing strip, and fastening means passing through said lugs and said nailing strip to prevent upward displacement of the latter from said chair.
4,. A chair for supporting a sleeper or nailing strip for fire-proof floor construction or the like comprising, in combination, a substantially flat horizontal base portion adapted to be laid on a concrete lower floor after the concrete has set or substantially so, said base portion supporting the nailing strip, and a finishing floor supported by said nailing strip, oppositely disposed lugs bent vertically from the central portion of said base portion for laterally'embracing said nailing strip, said oppositely disposed lugs being spaced from each other a distance substan- EVERETT N. MURPHY.