US2276558A

US2276558A - Closed cavity end concrete block mold

Info

Publication number: US2276558A
Application number: US353645A
Authority: US
Inventors: Zuber Emil Frank
Original assignee: MICHIGAN SILO Co
Current assignee: MICHIGAN SILO Co
Priority date: 1940-08-22
Filing date: 1940-08-22
Publication date: 1942-03-17
Anticipated expiration: 1959-03-17

Description

2 Sheets-Sheet. 1

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March 17, .1942 E. F. ZUBER CLOSED CAVITY END CONCRETE BLOCK MOLD Filed Aug. 22. 1940 Mazda 1? 1942. E. F. zuiaER 29 765 8 CLOSED CAVITY END CONCRETE BLOCK MOLD Filed Aug"; 22, 1940 2 Sheets-Sheet 2 Patented Mar. 17, 1942 CLOSED CAVITY END CON CRETE BLOCK MOLD Emil Frank Zuber, Peoria, 111., assignor to The Michigan Silo Company, Kalamazoo, Mich, a

corporation of Michigan Application August 22, 1940, Serial No. 353,645

6 Claims.

This invention relates to means for forming a concrete building block having the usual hollow cavities but, most importantly, having the top end solid across the upper ends of these cavities whereby the block may be used for the top course in a foundation or wall so as to prevent passage of termites or the like from the ground up through the blocks to the wooden structure thereabove.

The building code in some cities requires that on top of the last course of concrete blocks there must be build a form at least one inch high and this form filled with cement or concrete in order to form a concrete slab blocks. By use of my invention, this rather expensive operation of forming such a slab is avoided since the blocks may be molded directly to have a solid top face.

A primary advantage of the invention is that the closed end-cavity blocks may be formed just as rapidly as the customary open end-cavity blocks and without distortion or change in shape and size. My invention contemplates the shortening of the core in the block mold thatforms the cavity so that the concrete may be formed directly over the ends of the cores presented. However, in order to make possible the removal of the block from the cores or the cores from the block, means must be incorporated in the mold in conjunction with the cores to prevent that part of the concrete forming the closures over the,

cavities from being sucked downwardly into the cavity by reason of the vacuum otherwise produced. A further important advantage of the invention is that there are no parts that have to be mechanically connected with any timing or actual operating mechanism of the block forming machine, since the structure forming the invention operates automatically.

These and many other objects and advantages of the invention will become apparent to those versed in the art in the following description of one particular form of the invention as illustrated in the accompanying drawings, wherein- Fig. 1 is a side elevation of a concrete filled block mold, a portion of the side wall of the mold being removed;

Fig. 2, a similar view showing the block in a partially removed position;

Fig. 3, a detail in side elevation and partial section of the block cores;

Fig. 4, a top plan view;

Fig. 5, a transverse section through one core on the line -5 in Fig. 3; and

to seal off the hollow- Fig. 6, a vertical section on the line 6-6 in Fig. 3. I

Like characters of reference indicate like parts throughout the several views in the drawings.

Referring to the drawings, the mold I0 is made in the usual and well known manner to carry a plurality of cores I I entering therein from the under side, three such cores being shown to form the standard type block. Instead of continuing these cores to the top of the mold box l0, they are cut off to terminate by their upper ends at a distance therebelow as indicated in Figs. 1 and 2. A plate I2 is placed on the top end of each of the cores I I. This plate I2 has a periphery coinciding with the periphery of the core at its top end so that the side of the plate I2 forms in efiect a continuation of the side wall of the core without any ofiset or projection therebetween.

In order to locate and maintain the plate I2 in alignment with its core II, a stem I3 is fixed to the under side of the plate I2 and is carried down through a slot in the top end'of the core II. In order to prevent revolution of .the plate about the end of the core. I I, the stem [3 is formed in a rectangular shape to fit slidingly within a hole of like conformation in the end of the core I I. Preferably the stem I3 extends downwardly within the core II a sufiicient distance to permit bending or otherwise deforming the lower end of the stem so as to limit the upward travel of the plate I2 from the core II. In the present form, the lower end of the stem I3 is split and one side bent outwardly as indicated in Fig. 6. Of course, the stem may be drilled through to receive a cotter pin I l as a stop. In any event the plate I2 is free to be lifted above the end of the core I l until the stop on the stem I3 arrests further travel.

The top end of each core II is provided with one or more air vents or'holes l6, herein shown as two in number, one on each side. of the hole through which the stem I3 passes. The core II in each instance is secured to the floor I! of the mold by any suitable means, herein shown as by a cap screw I8 extending up through the floor I] and screw-threadedly engaging a bar I9 extending transversely across the hollow interior of the core and being secured to the core wall on each end byany suitable means, such as by welding. The core II in each instance is provided with a base air hole 20, here shown as in the lower end of the side base or floor I1.

To use the invention, the cores above described wall immediately at the are positioned within the core box [0, as indicated in Figs. 1 and 2. Referring to Fig. 1, the cement or concrete is placed in the box Ill and tamped down in the usual manner to form the block as indicated. As will be noted, the block is closed across its upper end by reason of the cores II and their plates l2 terminating at an elevation below the top of the box l so as to permit concrete or cement to be carried entirely across and over the upper ends of the cores II and their plates l2 so that no opening is left in any instance from the top side of the block 2| into the I top ends of the cavities formed by the cores I I.

Following the placing and tamping of the concrete, the block 2| is relatively shifted upwardly in the usual manner so as to remove it from the box l0 and the cores H. Referring to Fig. 2, the block 2| is shown as having been shifted in relation to the box It a slight distance. In this initial shifting, it is to be noted that the plate l2 follows upwardly with the block due to the fact that a slight vacuum is created within the space above the plates l2 and the under side of the concrete which is in contact with the plate l2. The upper portion of the block 2| is thus supported and prevented from being pulled inwardly by the vacuum above the cores as the block 2| is relatively moved from the cores. However, the slight initial upward travel of block 2| immediately clears air holes 20 and air passes at once through these holes and upward through holes IE to the space between cores II and plates 12; thence it finds its way around the edges of plates 12 and relieves the partial vacuum between plates l2 and the concrete above plates [2. To facilitate this air movement, the edges of plates I2 are beveled as shown. With the partial vacuum removed, plates l2 immediately drop back down onto the ends of cores H in every instance.

If the cores H are slightly tapered, as is quite customary to facilitate their withdrawal and as is shown in the drawings, then the initial relative travel of block 2| away from cores H lets air also travel along outer walls of cores H to reach the space between cores H and plates [2 without passing through holes 29 and I6.

The stops on the stems I3, of course, prevent undue travel of the plates I2 away from their cores H as well as prevent misalignment therewith so that the plates l2 are always automatically repositioned and ready for use in subsequent molding operations.

While I have herein shown and described my invention in the one particular form, it is obvious that structural variations may be employed without departing from the spirit of the invention and I, therefore, do not desire to be limited to that precise form beyond the limitations as may be imposed by the following claims.

I claim:

1. In a concrete block mold, a core, a plate on the end of the core, said plate being shiftable in relation to the core in the direction of the axis of the core, means maintaining the plate in alignment with the core, and stop means limiting the travel of the plate from the core.

2. In a concrete block mold, a core, a plate on the end of the core, said plate being shiftable in relation to the core in the direction of the axis of the core, means maintaining the plate in alignment with the core, and stop means limiting the travel of the plate from the core, said core having one or more air vents in said end under said plate.

3. In a concrete block mold, a core, a plate on the end of the core, said plate being shiftable in relation to the core in the direction of the axis of the core, means maintaining the plate in alignment with the core, and stop means limiting the travel of the plate from the core, said core having an air vent in its side wall at its base.

4, In a concrete block mold, a core, a plate on the end of the core, said plate being shiftable in relation to the core in the direction of the axis of the core, means maintaining the plate in alignment with the core, and stop means limiting the travel of the plate from the core, said core having one or more air vents in said end under said plate, said core having an air vent in its side wall at its base.

5. For molding plastic articles to have a cavity therein opening from one side of the article and closed at the other side, a tapered core having an outer transverse end wall shiftable in relation to the core in the direction of the axis of the core, said core having one or more air vents through the core opening under said wall, whereby relative movement between the article molded over the core and the core for core withdrawal allows said wall to move initially with the article until the cavity is vented through said vent.

6. For molding plastic articles to have a cavity therein opening from one side of the article and closed at the other side, a core having an outer transverse end wall shiftable in relation to the core in the direction of the axis of the core, whereby relative movement between the article molded 'over the core and the core for core withdrawal allows said wall to move initially with the article until the cavity is vented.

EMIL FRANK ZUBER.