US2480477A - Apparatus for removing forms from concrete blocks - Google Patents

Description

Aug. 30, 1949. 7 s 2,480,477

APPARATUS FOR REMOVING FORMS FROM CONCRETE BLOCKS Filed Aug. 13, 1946 I Z-rrzsf I Johzs Patented Aug. 30, 1949 UNITED STATES PATENT F FICE- APPARATUSjQREEMOVING- Foams FRQM I coNon 'rE BLGGKS ForrestH. Jones, Rockport, Wash. Application August 13, 1946;, seriai No. 690,113

My inventionrelatestoforms for producing concrete blocks or the like and more particularly toapparatus tOTGli-ljOlftH tom-from the finished block.

The object of invention is to provide an apparatus to be pieced between the'mold and the material tobe forriiedtlierein and adapted to be filled with compressed air to lift andremove the formfrom the finished product. v 7

other objeets of the invention nray'appeari n thefolIowi-iig specification describing my ir'n err-- tion with reference to the accompanying drawing illustrating preferred {embodiment of my imfntifi.

It is, however, to be understood thatmy inven tior-i is not tobe limited or restricted to the exact construction and combination of parts described in the specification and shown in the drawing, but that such changes and'modifications can; be made which fall within the scope of the claims appended hereto.

In the drawing Figure 1 is a top View of an apparatus according temy invention. 7 I I i Figure'2- is asectional view taken on line Z -2 in Figure 1 the apparatus beingshown in deflated position. 7 I H Figure 3' is a sectionalview similar to Figures, but showing the apparatus in inflated position and showing a connection between the apparatus and a pipe line for compressed air, and

Figure 4 is an exploded sectional detail view of a fragment of the upper section of the apparatus and the lower section thereof, showing a compressed air outlet in the upper section and a guide pin fitting in said outlet and rigidly mounted on the lower section, the two sections being made from a center layer of textile and two layers of rubber covering the center layer.

Referring now ,in detail to the drawing the apparatus according to my invention has preferably a circular outline. In Figures 2 and 3 it is shown as being made from automobile body metal or the like. It has a circular upper section It], on which an upwardly extending hollow boss H is either formed integrally or fastened rigidly, as by welding. The boss is located centrally of the circular section, A pipe I2 is located in and extends through the hollow boss II and through the top or upper section l0. It is securely fastened in position by means of a washer l3, firmly attached to the underside of the upper section Ill, for instance, by welding. The upper end of the pipe I2 is provided with an outside thread It adapted to be threadedly engaged by a coupling nut IS on s'oiaime (01. 25-120) .2 e 5 ahose f6 or the like connected with a source-of compressed air (not shown).

a plurality or holes :1 is provided in the upper section HF, and these holes are arrangedat equal distances from the centrally located pipe 12 and at equal angular distances from each other.

A lower section t8 has the same shape and size as the top section [0 and-the two' sections are.

securely welded together at their circumference; so that the seam is air-' tigh-t.

' A plurality guide plugs l'9 are securely fas tenee'onto the upper" surface or the lower section it and are locatedthereon, so that they come-- spend with the location of the holes 11 in the upper section to. Theplugs are finished to fit slidably said: holes. e

-, In: Figure 4;-

upper section is illustrated ccnisistirig of an inner layer 2t made from: teX tiIe' fabric and two outside layers 22' and 23 respec- 2i? ti vefii 1132166 from rubber and covering the in tial layer; Thelbwer section 24 illustratedin Figure- 4 is also made or aninr ier textile layer 25 and two outside rubber layers} 26 and 21 respectively coyering the inner textile layer 25.

embedded; This pipe corresponds to the pipe 2 in Figme sz'and 3 and adapted be engaged by acoupl-ing similar to the nut It A plurality of holes 28, corresponding to the holes I! in Figure 3, is provided in the upper section 20 and the edges of these holes are protected against damage by thin steel washers 29 embedded in the textile layer 2| or by wales provided in said layer.

In the lower section 24 frustoconical countersunk washers 30 are provided. Through each countersunk washer a countersunk screw 3| extends upwardly, and a plug 32 is adapted to be engaged threadedly by and securely held on each screw. The screws are located so that the plugs 32 fit slidably into the holes 28 in the upper section 20, when the two sections are connected with each other on their circumference to form an air-tight unit.

In use the above described apparatus is arranged on a form 33, in which a concrete block. 34 or the like is to be formed, before the concrete is poured. After the block 34 is finished and ready for removal, compressed air is permitted to flow into the apparatus, expanding it, as shown in Figure 3 and separating the form from the block easily and readily.

While my invention has been described in use 3 for removing cement blocks from the forms or vice versa, it is to be understood that it can also be used for stripping forms from concrete walls and all other types of concrete constructions.

Having described my invention I claim as new and desire to secure by Letters Patent:

1. An apparatus for stripping a form from a molded article by fluid pressure, comprising an expansible member adapted to be interposed between an inner surface of a form and the molding material contained therein, said member comprising inner and outer coextensive sections of impervious sheet material disposed in superposed relation, said sections including marginal portions hermetically sealed together, means for introducing fluid under pressure between said sections to expand said member, one of said sections being formed with at least one aperture therethrough, a plug carried by the other section and extending through said aperture, said plug being formed to have a close sliding flt in said aperture, and said plug being adapted to be completely withdrawn from 'said aperture after predetermined expansion of said member, whereby to relieve fluid pressure therein.

An apparatus for stripping a form from a molded article by fluid pressure, comprising an expansible member adapted to be interposed between an inner surface of a form and the molding material contained therein, said member comprising inner and outer coextensive sections of impervious sheet material disposed in superposed relation, said sections including marginal portions hermetically sealed together, means for introducing fluid under pressure between said sections to expand said member, said outer section being formed with at least one aperture therethrough, an inwardly directed plug carried by said inner section and extending through said aperture, said plug being formed to have a close sliding fit in said aperture, and said plug being adapted to be completely withdrawn from said aperture after predetermined expansion of said member, whereby to relieve fluid pressure therein.

3. An apparatus for stripping a form from a molded article by fluid pressure, comprising an expansible member adapted to be interposed between an inner surface of a form and the molding material contained therein, said member comprising inner and outer coextensive sections of sheet metal disposed in superposed relation, said sections including marginal portions hermetically sealed together, and means for introducing fluid under pressure between said sections to expand said member.

4. An apparatus for stripping a form from a molded article by fluid pressure, comprising an expansible member adapted to be interposed between an inner surface of a form and the molding material contained therein, said member com prising inner and outer coextensive sections of impervious textile sheets disposed in superposed relation, said sections including marginal portions hermetically sealed together, and means for introducing fluid under pressure between said sections to expand said member.

5. An apparatus for stripping a form from a molded article by fluid pressure, comprising an expansible member adapted to be interposed between an inner surface of a form and the molding material contained therein, said member comprising inner and outer coextensive sections of impervious sheet material disposed. in superposed relation, said sections including marginal.portions hermetically sealed together, means for introducing fluid under pressure between said sections to expand said member, one of said sections being formed with at least one aperture therethrough, annular means reinforcing said aperture, a plug slidable in said aperture, means'detachably connecting said plug to the other section, and said plug being adapted to be completely withdrawn from said aperture after predetermined'expansion of said member, whereby to relieve fluid pressure therein. r

FORREST H. JONES.

REFERENCES CITED The following references are of record in the

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