US1392496A - Concrete-form - Google Patents

Description

J. C. HAIN.

CONCRETE FORM.

/ APPLICATION FILED JUNE 24.1919.

Patented Oct. 4, 1921. I

Jdnud T; UNITED STATES PATENT OFFICE.

JAMES C. HAIR, OF LOS ANGELES, CALIFORNIA.

CONCRETE-FORM. I

Specification of Letters Patent.

Patented Oct; 4, 1921.

Application filed .Tune 24, 1919. Serial No. 306,444.

T 0 all whom it may concern:

Be it known that I, JAMES C. HAIN, a citizen of the United States, residing at Los Angeles, county of Los Angeles, and State of California, have invented a certain new and useful Concrete-Form, of which the following is a specification.

My invention relates to a means for producing hollow units particularly from plastic material, such as concrete .and other cementitious compositions, and it has especial reference to a form for making hollow concrete block, structural units or parts of buildings. an object of the invention being to provide a simple and particularly an economical device of light and strong construction, in which the smallest possible amount of wood or other material may be used.

This and other objects are accomplished by the design illustrated in the accompanying drawing and showing one of a variety of forms embodying my invention. Therein Figure 1 is a perspective View of a frame showing part of the covering adapted therefor, and

Fig. 2 is a plan view showing the form embedded in a concretionary mass.

, My invention relates to that especial art of forming structural units which contemplates the application of the cement, concrete, or other plastic building material, undcr pressure, but is not restricted in that respect, since use of the completed form may be made in the manufacture of building units by other methods.

My invention may comprise a frame 1, that for the purposes of this specification may consist of strips 2, preferably heldtogether and spaced by a suitable plate 3. Around the strips 2 of the form is placed a sheathing or covering 4, of any suitable material, as paper, and such sheathing or covering may be wound spirally about the frame, as shown, and preferably at such a pitch that the convolutions overlap.

In order that the strips 2 of the frame may be held rigid and firmly bonded, so that subsequent swelling thereof shall not cause faults, breakage or cracks in the concrete mass applied thereto, the sheathing or covering 4, may be moistened or otherwise treated previous to applying the same to the frame, whereby shrinkage, contraction or warpingof the covering resulting from drying, shall more closely and intimately envelop and bond the strips of the frame, and at the same time offer suflicient resistance to the concrete or cement when applied under pressure.

What I claim, is

1. A form for envelopment by a plastic material comprising a frame wound with paper.

2. A form for envelopment by a plastic material comprising a frame spirally wound with a fibrous material.

3. A form .for envelopment by a'plastic material comprising a frame having a cover ing shrunk thereon.

4:. A form for envelopment by a plastic material comprising a frame having a fibrous covering spirally wound and shrunk thereon.

5. A form for making hollow plastic bodies comprising a frame having a strip of paper wound thereabout and shrunk thereon.

6. A. form for' making hollow plastic bodies comprising a frame having a fibrous material spirally wound thereabout with the convolutions overlapping.

7 A form for making hollow plastic bodies comprising a frame spirally wound with paper previously moistened and shrunk thereon.

8. A core for casting hollow units of plastic material comprising a frame having a flexible covering thereon previously moistened to cause a contraction thereof after application.

In testimony whereof I have set my hand.

J. C. HAIN..

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