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24,457 · Keppler · "Improvements in or relating to Reinforced Concrete Structures" · Page 1
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Nº24,457 British Patent Office seal A.D. 1909

Date of Application, 25th Oct., 1909--Accepted, 28th Apr., 1910


Improvements in or relating to Reinforced Concrete Structures.

    I, FRIEDRICH LUDWIG KEPPLER, Architect, of Lehderstrasse 34/35, Weissensee, near Berlin, Germany, do hereby declare the nature of this invention and in what manner the same is to be performed, to be particularly described and ascertained in and by the following statement:—

    This invention relates to reinforced concrete structures and is particularly applicable to the building of roofs, floors and the like. The object of this invention is to form structures which offer greater resistance to stress and strain and at the same time afford a maximum area for the passage of light.
    According to this invention metal frames each adapted to support a transparent panel and having lateral projections are built up in such a way that spaces are left between the edges of each adjacent frame, the lateral projections serving as distance pieces to determine the spaces which are subsequently filled with cement or other binding material in which are embedded reinforcing metal rods.
    In the accompanying drawings,
    Figure 1 shows in plan the corner of a concrete structure according to this invention, the glass panels and binding material being omitted.
    Figure 2 is a section on the line 2—2 of Figure 1.
    Figure 3 is a section on the line 3—3 of Figure 1 showing the glass panels in place and the binding material, and
    Figure 4 is a plan view of the four adjoining corners of a modified form of metal frame.
    A building element according to this invention comprises a metal frame 1 adapted to support a glass panel 2, preferably of square or other rectangular form, a layer of cement being inserted between the upper edge or rim of the frame and the glass panel.
    Each corner of the frame has a lateral flange or extension 3 forming a distance piece to determine the width of the space between each frame.
    To form a concrete structure of the required size, a series of unit frames as above described are assembled on or off the site to suit special requirements, temporary centering being employed in the former case. The frames are placed together in such a way that the projections 3 form distance pieces which determine the width of the longitudinal or transverse spaces 4 and 5 between each frame. These spaces are then filled with cement, the reinforcing rods 6a and 6b being embedded therein, after which cement is placed with a trowel on top of the upper edges or rims of the frames 1. The glass plates 2 are then put in position on the layer of cement, slight pressure being used to get the same in alignment. The remaining space between the glass plates 2 is then filled up with mortar, thereby making the whole into a compact plane surface. The cement or binding material unites the series of frames and forms a single structure which, by reason of the iron frames and reinforcing bars 6a, 6b, is capable of withstanding severe stresses or strains, being at the same time of an almost entirely transparent nature. The glass panels 2 and the metal frames 1 may be of any shape or size to meet varied requirements.
    In the special form of construction shown in Figures 1 to 3 the metal frames 1