US1756473A - Form and mold - Google Patents

Description

April 29, 1930. J N BE v 1,756,473

FORM AND MOLD Filed 0ct. 21, 1927 iax llmlll INVENTOR JOHN N. RAUBER Patented Apr. 29, 1930.

FATE

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JOHN N. RAUBER, F ROCHESTER, NEW YORK FORM AND MOLD Application filed October 21, 1927. Serial No. 227,730;

This invention relates to forms for molding concrete curb sections and the like.

In molding concrete curb sections it has formerly been the practice to'employ either an expensive molding machine in which the parts forming the mold consisted of heavy cast-iron plates or else to employ long sheets of steel of substantially the height of the curb and provided with spacers or dividers to determine the length of the curb sections. The use of a molding machine, aside from the expense involved, has not been satisfactory due to the fact that curb sections must be made having great strength necessitating a much wetter mixture than in the case of building blocks with a result that the curb section must be permitted to remain in the molding machine for a relatively long period of time to permit the proper setting of the concrete. The length of time required and the expense of providing a sufficient number of molding machines to produce concrete curb sections in commercial quantities has prevented the use of such machines from becoming commercial. Where the mentioned long sheets of steel and dividers are employed for forming curb sections it is customary to cast the sections in their final position along the side of the street. Where the concrete 0 is thus poured in the street, weather conditions must be favorable and the close supervision possible under factory productioncannot be maintained. Since these steel forms are open at the top it is necessary to trowel or finish the top of the curb section since it is exposed to view. This operation is expensive and it has been found that the top of the curb tends to flake due to the fact that water in the mixture tends to rise to the top where it is covered with a film of cement which when dried tends to crumble. This results in an irregular appearance of the top of the curb sections.

In accordance with the present invention 4 applicant proposes to mold the curb sections in inverted position by employing a mold formed of plates of sheet material in which the portion of the mold engaging the exposed surface of the section is of one piece so that this surface is smooth. Since the section is poured in inverted position the need for careful troweling is obviated because the'trowelled surface is on the bottom of the section which is concealed when the section is set in its final position. It has also been discovered that the concrete in thelower part of the mold is denser than that at the top and this increased density of the concrete increasesits strength. In former concrete curb. sections it was customary to employ a steel insert in the corner of the curb section which was. exposed to shock from being struck by vehicle wheels. In the present process of molding curb sections the top and exposed corners of the sections are of greater density and there- :4 fore possess greater strength due to the fact that the sections are molded in inverted position so that the reenforcing steel strips are not necessary. In addition to these advantages the plates of the mold are so designed that they may be readily disassembled to permit removal of the finished block there.- from and they may be nested for storing in a minimum amount of space. 7

These advantages and others will appear from the detailed description and the appended claims.

. Referring to the drawings Fig. 1 is a fin I ished section of precast curb molded in the form or mold of the present invention. Fig.

2 is a section through the assembled form showing the position of the curb section-there in. Fig. 3 is a-perspective view of a front. plate of the mold while Fig. 4 shows aperspective view ofthe back plate of the mold and Fig. 5 shows a front view of the inside of an end plate of which two are employed in the mold.

The perspective view of Figurel shows the face or exposed. portion of a section of the precast curb 25 which should be smooth to present a finished appearance and mustshow no seams caused by two plates of-the mold or form coming together. It is proposed to manufacture these sections in a factory where V the conditions of manufacturing may be closely observed and where temperature and moisture conditions may be closely regulated.

It is also essential for economy in, manufacturing that the molds or forms be inexpensive and-that they may be disassembled and nested in a mlnimum space when 1t is necessary to store them. This precast curb section does not form a part of the present invention since it is the sub ect of a copending application, Serial #215,586 of John N. j

. Rauber, filed August 26, 1927.

' the; bottom of the curb section.

The mold or form of the present invention includes a face plate 6 shown in Figure 3, a back plate '4' shown in Figure 4 and two end plates 8, one of which is shown in Figure 5 all arranged to be joined together by suitable tongues, slots and keys. The face plate 6 is formed with a substantially horizontal portion 9, an inclined portion 10 and a substantially vertical portion 11, the junction between the sections 9 and 10 being rounded as indicated in Figure 2. The upper edge of the verticalrportion 11 is provided with a flange 12 which serves to strengthen the face plate and also functions as a guide for removing excess cement from The back plate? is substantially flat except that it has a flange 13similar to the flange 1'2 likewise provided for strength and to serve as aguide V in finishing the curb section. Tongues 14; fastened to the outer surface of the back plate 7 engage the outer surface of the upplate to engage certain of the slots in said end plates, interlocking means on said back plate and the horizontal portion of said front plate, and means for locking the tongues in position in said slots.

In witness whereof, I hereunto subscribe my name this 19th day of October, 1927.

' JOHN N. RAUBER.

turned flange on the section 9 while similar tongues 16 secured on the outer surface of this1last mentioned flange engage the outer "surface of the back plate 7. As shown "in Figure 2 the lower edge of the back plate and the edge of the upturned flange are normally flush and held in this position by i the tongues 14 and 16. The face and back The portions designated 20 I 1. In a form for molding an article of cement comprising'face, back and end plates ofsheet metal, said face plate being made of integral sheet 'material consisting of side and" bottom portions extending at substan tially right angles to each other, joined to- I gether by an inclined portion, said bottom portion being provided with an upstanding flange, said back and end plates being substantially flat, and means for locking said plates together with an edge of the back plate I in engagement withan edge of said flange.

2. In a form for molding an article of cement, two substantially flat endplates provided with slots, a substantially flat back plate provided with tongues toenter c-ertain of said slots, a face plate having a ver tical portion and a horizontal portion joined by an inclined portion, tongues on said face

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