UNITED STATES PATENT OFFICE.
DENNIS JOHN FLYNN, OF NEW BRUNSWICK, NEW JERSEY.
Specification of Letters Patent. Patented June 29,1920.
Application filed February 17, 1919. Serial Ho. 277,609.
To all whom it may concern:
Be it known that I, Dennis John Flynn, a citizen of the United States, and a resident of New Brunswick, in the^county of 5 Middlesex and State of New Jersey, have invented a new and Improved Cementitious Structure, of which the following is a full, clear, and exact description.
The invention relates to the building of 10 walls, piers, lintels and other similar structures, and its object is to provide a new and improved cementitious structure arranged to dispense with wooden forms in building walls, piers, lintels and like structures, and 16 to render the structure exceedingly strong and durable. Another object is to permit of quickly building the structure and without waste of concrete or other cementitious material. Another object is to obviate the for20 mation of cracks in -. the structure and to practically render the structure moisture proof.
With these and other objects in view, the
invention consists of certain novel features
26 of construction as hereinafter shown and
described and then specifically pointed out
in the claim.
A practical embodiment of the invention is represented in the accompanying draw30 ings forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.
Figure 1 is a perspective view of the improved structure in the form of a wall; 86 Fig. 2 is a plan view of the same;
Fig. 3 is an enlarged cross section of the same on the line 3^3 of Fig. 2;
Fig. 4 is a perspective view of the adjacent ends of two form and facing slabs in 40 disassembled position;
Fig. 5 is a plan view of the improved structure in the form of a pier;
Fig. 6 is a sectional side elevation of the same on the line 6—6 of Fig. 5 and with the 45 cementitious filling omitted; and
Fig. 7 is a cross section of the structure in the form of a lintel.
The wall illustrated in Figs. 1 and 2 consists essentially of two parallel rows 10 and 50 11 of form and facing slabs 12 connected with each other by tie plates 13 with a cementitious material 14 filling the space between the two rows 10 and 11 and embedding £he tie plates 13. Each of the facing 65 slabs 12 is provided at one end with a vertically disposed dovetail groove 15 and at
the other end with a vertically disposed tongue 16, of which the dovetail groove 15 of one slab 12 is engaged by the dovetail tongue 16 at the corresponding end of the 60 adjacent slab. By the arrangement described the slabs 12 of each row 10 and 11 are securely interlocked with each other.
The inner face of each slab 12 is provided with vertically disposed dovetail tongues 20 65 extending throughout the width of the slab, and each of the tie plates 13 is provided at its sides with dovetail tongues 21 engaging oppositely located dovetail grooves 20 to securely tie the slabs of the two rows 10 and 70 11 together with a view to securely holding the rows of slabs in the desired spaced relation according to the thickness of the wall to be formed. The space between the slabs tied together sidewise in each row and crosswise 75 to connect oppositely disposed slabs with each other is filled with concrete or other suitable cementitious material which not only embeds the cross ties 13 but also fills the dovetail grooves 20 not occupied by the 80 dovetail tongues 21 of the tie plates 13. Thus the cementitious material when set and hardened securely locks the slabs 12 in position, it being understood that the slabs 12 are used as a form for the plastic cementi- 85 tious material and for forming outer and inner facings for the wall. In practice, the slabs are preferably made of hard burned clay and the tie plates 13 .are of a similar material. Each or the slabs 12 is preferably 90 thirty inches long and twelve inches high but two plates 13 are found to be sufficient for connecting each pair of oppositely dis•posed slabs, as plainly indicated in Figs. 1 and 2. 96
In building the wall the preferred method is that the mason first erects one course of form and facing slabs after which the filling of concrete is placed in position and tamped in the usual manner. When one course is 100 completed work on the second course is commenced and so on .throughout the entire height of the wall. Another method is for the mason to erect all courses of form and facing slabs and their ties to the height of 105 the desired wall and then fill in with concrete material. It is understood that by the arrangement described the slabs form permanent parts of the wall and are used as forms for holding the plastic material in 110 place during the setting and hardening. When is desired to build a pier, as shown