US2523713A - Tieless concrete mold - Google Patents

Description

p 26, 9 w. E. MORTRUDE, JR 5 7 TIELES. 'QQNC ETE MOLD Filed July 10, 1946 u Em,

WITNESS Patented Sept. 26, 1956 UNITED STATES PATENT OFFICE TIELESS CONCRETE MOLD v v William E. Mortrude, Jr., Seattle, Wash.

Application July it, 1946, Serial No. 682,695

"3 Claims. (01. 25-131) My invention relates to the building arts and improvements therein associating tieless concrete and cement mortar molds with the resultant wall formed thereby. p

One object of my invention is to make provision for mold wall units in the form of a V, when viewed from the end, which when a plurality of the said units are placed on end, in an upright position, and placed in side to side contiguity, the parallel sides of the extreme diverging edges are inunattached adjacency with formation of a plural V wall of any reasonable height as from a floor to a ceiling.

The primary object of employing V mold wall units, when set up as a double Wall with concrete filling space means between and with each independent V mold unit of one Wall diagonally opposite another such V mold unit of the opposite wall, is to provide a self contained wall reinforcing measure. That is, by adoption of the V mold wall units pressure resistance is instituted by the wall when subjected to the weight of the concrete mass contained within. The resistance of the V mold wall preventing bulging at any point from the foot to the top thus completely dispensing with the tedious work and expense of tieing the walls together by means of wires and bolts'such as is customary in concrete wall construction.

A further object of my invention is the means for longitudinal self locking of .each succeeding V wall unit, thus tieing the entire wall-together horizontally. This is accomplished by pointing inwardly the V unions adjacently unattached, thus the opposing right angle forces pressing upon each joined V securely holds them together with a force equal to the weight of the concrete column contained within the mold. 1

Other objects of my invention confines itself to the principle that any one V wall unit, because wall, and for this reason the thickness of .the.

wall may be greatly reduced. Because of the thinness of the concrete V wall, 'a special top plate, covering the width expanse of the wall, must be placed along the entire top of the wall for supporting and attaching joists.

A full disclosure of the foregoing objects are included in the following specification and accompanying drawings.

In the drawings:

Fig. 1 is a perspective view of a V concrete mold unit.

Fig. 2 is a top plan view of a plurality of V concrete mold units arranged in side to side contiguity with their parallel edges adjacently unattached.

Fig. 3 is a top plan view of two continuous plural V walls placed apart and opposite so that the Vs of one are opposite the Vs ofthe other and with the V walls parallel with concrete space between. Also showing top anti-spreading members arranged along the sides of the walls and held by transverse members. 7

.Fig. 4 is a cut-away projected view, in -vertical, of Fig. 3. l

Fig. 5 is a cut-away perspective view of a plural V mold resting within a footing recess, with a concrete wall formed, with a portion of the V mold units removed exposing the V concrete wall.

Fig. 6 is a cut-away view showing the top side Y of a concrete wall with top plate bolted to the top.

l4 and I5 and diverging, and with square cut ends l6 and ll so that any one such unit may stand upright unassisted, without holding or bracing.

A plurality of V wall units (Fig. 2) [B are I shown mounted upon a footing and plate It and indicates the unattached unions I9, 19, of H], II],

V .at l2 and It. This arrangement of V wall units H! provides a convenience forerecting extemporaneous walls without resorting to concrete, and in which case the unattached union is is attached.

The two walls 2!] and (Fig. 3), comprising a plurality of V wall units I U are spaced apart at any prearranged dimension, such as the thickness of concrete wall 23. They are so placed that the sides of any V so occupied are parallel as [4 of 2| is parallel to M of 20 and [5 of 2! is parallel to H5 of 20. It is also to be noted that any V wall unit I i] of 2| and It of 2B are placed so that their opposite positions overlap each other'half ways, diagonally, and in such a way that V apex ll points outwardly and is directly opposite unattached union apex I9 which points inwardly. It is important that unattached. adjacent unions I9 point inwardly due to the fact that when the weight of the column of concrete mass 22 enters the mold space 23, pressure is directed a ainst the inside surface of of 20 and ll'of- 2:],

V mold wall unit It), being of V construction, has two sides I'l'laSS.

3 according to arrow F, and counter pressure against I5 of 20 and I5 of 2|, at arrow F, thus resulting in a holding pressure upon the outer surfaces of unattached surfaces l2 and [3 at union l9; It will be seen that this principle provides a responsible means for tieing the V mold Wall units I together with a force equal to the Weight of the concrete mass 22 at any point from the top I! to bottom [6 and ties all V wall units.

I0 together in the horizontal wall system.

Provision is made for anti-spreading means of the V mold walls 29, 2|, and is accomplished by placing the said mold walls in a recess 24 of footing 25 so that the apex points |I touch the sides 26, 21, of 24, allowing for molding space 23, which is the 'wall thickness. On the top H, wall spreading is prevented by means of transverse members 28 secured to parallels 29 which fit down over the sides and contact the V points ll along the entire length -of the top of walls 20, 2|. 7

"It will be seen from the constructional features of the associated V mold wall units 'lll, I'D, II), 'etc., and the anti-wall-spreading means at I6 and [1, that no further tieing of the walls 21 and 2! is necessary. This becomes apparent when it is noted that any side I4 or 15, existing as they do in 90 degree angular relationship or any plus o minus of 90 degrees, serve as reinforcing units all of which comprise the "walls 2| and 20. The reinforcing power of the multiple and contiguously placed Vfwall units ll] is such that "their resistance to the weight of the concrete mass 22 is equal to the tensile strength of a wooden member of equal width placed at right angles to the said pressure. 'That is, if the side I or 14 of a V wall unit Ill is a standard two by eight plank, it will resist a pressure equal to the resisting power of the said plank if placed at right angles, or the resisting power of the total. plural V walls 20, 2|, is equivalent to a plurality of two by eights placed approximately five inches apart and at right angles to the force. Hence,. and in accordance with tests, the V mold walls so constructed possess more than ample resist-- ance to counteractand prevent bulging from the weight-of the concrete mass 22 at any point from I6 '-to 11, thus doing away with the undesirable tieing "together of the walls :20 and 21 by wires and bolts. A v wall unit It, having an angle of.

90 degrees appears to be'the more practical anglealthough any angle may be employed so long as that angle is designed to conform -with the pressures to which it is to be subjected.

Attention is directed to the constructional principle involved in the plural concrete wall formed by the mold walls '20 and 2|. It inherits a tensile strength considerably superior to that of a flat'wall, mass for mass. While the multiple 'V concrete wall is longer by twenty seven percent it is designed to contain one third less concrete This concrete mass reduction is permissible because of the greater strength of this type of wall. The thickness of the V wall may be reduced to as low as forty percent of :a flat wall and yet possess high strength.

The concrete 'wall 22, because "of its lesser thickness than flat walls, and because of its. width expanse, is provided with studs 3-0 at its.

upper edge upon which is bolted the plate 3|,

which they are secured.

All

The vacant space 34 of recess 24 is filled iii with cement mortar of water proofing qualities when the V mold units I0 are removed from the wall 22 after setting.

Mold. wall unit l0 may be made from any material suitable for the work. Also the design of the mold wall unit H} may be deviated from the design indicated upon the drawings without altering the claims set forth. That is, the sharp V points within the mold wall, which determines the shape of the wall, may be made with a considerable radius to a degree within the limits of a semicircle without losing its claim identity, and without deviating from the principle involved.

The description of my invention contained within the foregoing paragraphs is believed to bring out the vital principles involved and right is reserved to make changes within the limitations of those principles found in the following claims.

I claim:

1. -In mold means adapted to form two Lopposed sides of a concrete mold cavity, two spaced apart :rows of independent and separable mold units :of V-shaped cross section, each mold unit comprising two diverging side walls with plane flat edge portions which are parallel toreach other and parallel to a plane which bisects therangle between said two diverging side walls, the mold units in each .row being positioned in upright edge to edge contiguous relation with the :concave 'side of each mold unit facing toward the mold cavity and with .each mold :unit .of each row offset a distance equal to substantially one half of its Width .relative to opposedmold units .inthe other row, whereby transversely :opposed .mold unit walls in the respective rows are parallel to each other and adjoining edgesof mold =.units.in the respective rows are offset relative to each other; and means external :to the mold cavity supporting the mold units of the two rows against movement away fromeach other.

2. In mold :means adapted to form twoopposite sides of a concrete mold cavity, two spaced apart rows of independent and separable mold units of Veshaped cross section, each mold unit comprising two diverging side walls, .the mold units in each row being positioned 'in upright edge to edge contiguous relation with the concave .side of each mold unit facing toward the mold cavity and with each mold-unit ofeachrow offset a distance substantially equal toonehalf of its width relative to opposed 'mold .units in the other row, whereby a mold'cavity of zigzag cross .sectional shape is provided between said two rows of mold units and whereby the .outward pressure of soft'concrete in the moldcavity'will press the :contiguous edge portions of said mold units firmly together; andmeans external to-the mold cavity .positioned at the top and bottom portions of said mold unitssupporting said mold units against outward movement.

3. 'In mold means adapted to form tworoppo- .site sides of a concrete mold cavity, two spaced apart rows of independentandseparable mold units of V-shaped cross section, each mold'unit comprising two diverging .side walls provided with plane flat edge portions which .arefparallel to each otherand parallel to a plane which rbi- *sects the angle between'said'two divergingside walls, the mold units-in each row beingpositioned in upright 'edge to edge contiguous unattached relation-with-theconcave side ofreach mold-unit facing toward the mold cavity -and =with each mold unit of each row offset a-distanceesubstan- 5 tially equal to one half of its width relative to opposed mold units in the other row, whereby a mold cavity of zigzag cross sectional shape is provided between said two rows of mold units and whereby the outward pressure of soft concrete in the mold cavity will press the parallel contiguous unattached edge portions of said mold units firmly together; parallel supporting bars positioned outwardly from said mold units adjacent the top ends thereof for engagement by 10 the apex portions of said mold units; cross bars positioned above said mold units rigidly connecting said parallel bars; and mold unit supporting means providing two upwardly extending spaced apart shoulders positioned external to the mold cavity for engagement by the apex portions of said mold units adjacent their bottom ends,

said mold units being unsupported and free from tie means between said bars and said shoulders.

WILLIAM E. MORTRUDE, JR.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 884,166 Kemper Apr. 7, 1908 1,373,523 Nicholas Apr. 5, 1921 1,568,997 Blount Jan. 12, 1926 2,272,659 Daley Feb. 10, 1942 2,375,648 Hamilton May 8, 1945

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