US1531109A - Block molding - Google Patents

Description

March 24, 1925. l

G. N. LEMMoN BLOCK MOLDING Filed Feb, 9, 1924 ATTORNEYS INVENTOR @Eb/Q65 /v. Emma/f Pamesa` Mar. 24, 1925. y

AUNITED STATES PATENT-OFFICE.

Gnonen N. Lmmou, or MARIETTA, (mortem.

BLOCK HOLDING.

Application led February 9, 1924. Serial No. 691,574.

To @ZZ wlzlom it may concern:

Be it known that a citizen of the United States of America,

I, Gronau N. LEMMoN,

plate by the side, top and bottom walls 18, 19 and 20 respectively. These walls are preferably ofchannel section, with their residing at Marietta, in the county of Cobb \{1anges 21 outwardly faced and provided and State of Georgia, have invented certain new and useful Improvements in Block Molding, of which the following is a speciication.

My invention relates to blockmolding, and the object of my invention is to provide an. improved mold form and method of operation. My invention is particularly yuseful in moldin of blocks from plastic material, in which 1t is desired to form inscripti-onsor ornamental panels, as for example in grave markers. M object is to facilitate the formation of e kmold inscriptions and the molding operation.

In the accompanying drawings- Fi 1 is a front elevation of a vmold form to w ich my invention is applied in one form;

Fig. 2 is a vertical section therethrough;

Fig. 3 is an enlarged section through one corner of the mold; n

Fig. 4 is an enlarged elevation of the interior face of the front wall of the mold, showing a letter form detached;

Fig. 5 is a section on the line 5 5, Fig. 4;

Fig. 6 is an enlarged vertical 'section through the panel area of this wall of the mold; and

Fig. 7 is a detached perspective of an ornament for use in the preparation of the panel illustrated in Fig. 6.

In the molding of blocks from plastics, various devices have been heretofore proposed for forming inscriptions and ornamental designs in the finished article. The methods heretofore used, however, have resulted in blocks so disiigured on their inscribed faces that they are not acceptable commercially without further finishing operations, which add'to the expense of-the structure. My invention not only affords economy of operation, but also results in a product whichrequires little or no finishing when taken Vfrom the. mold, and possesses features of improvement both in appearance and in serviceability not heretofore obtained.

Referring to the drawings, the mold form, preferably of metal throughout, and of any desired shape, comprises, as shown, a front plate 15 havin a continuous flat inner face apertured to a ord a panel opening 16. A solid back plate 17, is spaced from the front with apertures which register with similar apertures in the front and back plates 15 and 17 for the reception of clamping bolts 22 by which the mold parts are secured together. Filler pieces 23 at the junction of the mold sections are provided to prevent the flow of the plastic between the joints and to impart to the molded block corners of rounded contour. In Fig. 3 I have indicated the filler piece 23 soldered at 24 to the wall 19 and bearing at its free marginV against the plate 15. The attachment of the filler pleces may be to the front and back plates, however, if preferred. The bottom wall 20 is preferably apertured at 25 to afford an opening through which the plastic may be poured, either wholly or partially, into the mold. Tamping tools may also be introduced through this aperture.

In order to form an inscription upon the face of the block, I provide a font of type forms or letters 26, independent of the plate 15, butupon which they are secured in appropriate order for the desired legend. These letters 26, which may be solid, are preferably ofbroader base than apex, in order to facilitate their withdrawal from the block after the latter has been cast. The base of each letter is preferably fiat so that it may lie flush against the inner face of the plate 15 of the mold box. Preferably also the side faces of each letter are smooth, and may be polished for this purpose-while the base surface is unfinished and affords slight irregularities `(such as are incidental to casting) which are of benefit in the attachment of the letter to the plate 15.

In order to secure the letter forms in position, I provide an adhesive 26 which is unaffected bythe moisture of the plastic and is preferably of such character that it is readily softened by the application of slight heat. Paran affords an exceptionally good adhesive for this purpose, since it is not affected by moisture, melts at low temperature and presents, on hardening, a smooth surface of sufficient rigidity to constitute an eX- cellent mold face. When using an adhesive of this character, the letters, after being located in position, are secured b flowing melted paraffin around them. referably the temperature of the plate 15 and letters llO is sufiiciently raised to cause the paraffin to penetrate beneath the base of the letter and the surface of the plate, and cuter the irregularitiesl in the base surface of the letter, thus affording a secure anchorage for the letter. Furthermore, capillary action causes the paraffin to creep up thc sides of the letter, and form on cooling a smooth continuation thereof which constitutes, as it were, a concave fillet at the joint between the letter and the plate. This imparts to the characters a smooth and gentle line of merger with the face of the block. Sharp edges are thus avoided. and danger of chipping or breaking at the edges of the letters is eliminated.

At the panel opening 16 means are provided for forming an ornamental figure' of any desirable sort. I have shown in Fig. 7 a lily spray 28. While this ornament may be applied to the face plate 15 in'a manner similar tothe characters 26, I have indicated the panel opening 16 in order that t-he orna- `lment may appear in relief on the finished iblock, rather than in intaglio, as would be the case if the ornament were applied drectly to the plate in the same manner as the characters. Where the ornament is to appear in relief, as indicated, the form, such as the lily spray 28, is secured to an auxiliary backing plate 29 by means of paraffin 30. r This plate is then laid against the inner face of the front plate 15 of the mold box.

. A supplemental frame 31,` of slightly greater area than the panel opening, to afford a retaining fiange 32,' is secured on the outer face of the plate 15 surrounding the panel opening` 16. The auxiliary frame 31 is preferably provided at its inner margin with ofset flanges 33 apertured for the reception of securing screws 34 which take into shallow tapped holes in the plate 15. Flanges 35 at the outer margin of the frame serve to support and 'retain the material 36, which is poured therein after the backing plate 29 has been placed in position vat the panel opening. The material 36 may be of any appropriate character, preferably plaster of Paris, which affords a smooth mold surface for the reception of the plastic of the block.

Upon the hardening of the plaster of Paris 36, and the removal of the' backing plate 29, the material 36 forms a Hush continuation of the mold face of plate 15 and containing the impress 37 of the panel ornament 28. After the characters 26 have been properly arranged and secured upon the inner face of the plate 15, the molding of the block may be proceeded with.

For this purpose the sides, top and bottom members 18, 19 and 20 of the mold box are secured to the front plate 15. The back plate plate 17 ma be left off for the time being. The mold box being laid face down, the plastic-e. g., a neat or rich cement mixture-is poured in the mold and is permitted to partially set. This insures a smooth cement face for thc block in which the contours of the, ornament and of the characters 26 are perfectly reproduced. After this portion of the block has become sufficiently firm, the body of the block may be formed from a leaner cement mixture, the back plate 17 being secured in position and the mixture being introduced through the hole 25 in the bottom of the mold box, while the form is up-tilted. A tamping rod may then be inserted through the aperture 25 for manipulation in a manner well understood by those familiar with the making of concrete block. After the concrete has hardened sufficiently, the form sections may be removed, the block being referably laid upon its back, and the face p ate 15 first removed.

Any irregularities in the resultant block will be found in the'lower ortion, adjacent the fill hole 25, which is o course sunk in the ground when the block is placed in position.

While I have above referred to concrete as the plastic employed, terra cotta may be molded in the same form and subsequently baked. Again, it is obvious that the entire face 15 of the mold, box may be formed of plaster of Paris 36 after the fashion of the panel section. In this case the face of the block may be formed of porcelain slip flowed into the mold box, While the back may be of other material. Or all the Walls of the box may be formed of plaster of Paris and the entire block formed by pouring in porcelain slip. Or again, a core member may be arranged in the mold box, and a porcelain slip facing of the block be formed, and the interior of the block filled with some less expensive body, such as concrete.

Whatever form the body of the block takes, the initial step of forming the legends and ornaments by means of shapes attached to a flat plate by means of a moisture resistant adhesive, normally hard but melting at relatively low temperature,`is the same. Realizing that my invention may be employed to produce blocks of various types, it is to be understood that the accompanying drawing and the foregoing description are merely indicative of what I claim as my invention.

I claim-' 1. The method of forming a mold for -water plastic material, which comprises the step of applying to the face of the mold wall a raised form, securing said form to the wall by a moisture-unaffected adhesive in fluid condition, and permitting said adhesive to harden to form. portion of the mold by an adhesive material which forms a marginal fillet unaffected by moisture.

3. The method of forming a mold for Water plastic material, which comprises the step of applying to the face of the mold Wall a raised form, securing said form to the Wall by a heated moisture-unaffected adhesive in iuid condition, and permitting said adhesive to harden by cooling to form a marginal fillet for said form before introducing the moistened plastic into the mold.

4. The method of forming a mold for Water plastic material, which comprises applying to a Wall of the mold raised forms, securing said forms to the mold Wall by an adhesive material which forms marginal; fillets unaffected by moisture, and securing at an aperture in the mold Wall, a panel mold having a depression therein adapted to form portion of the mold Wall.

5. The method of forming a mold for Water plastic material, which comprises the step of applying to the face of a mold a raised form and detachably securing said form in position by paraiiin, and having said paraffin form a marginal fillet.

6. The method-of forming a mold face which comprises applying a fiat based raised form to the face of a mold plate, and securing said formv in position by a normally solid moisture resistant adhesive in the presence of heat sufiicient to cause said adhesive to enter irregularities in the base of sai-d form and constitute a secure anchorage therefor on cooling.

7. The method of forming a mold face Which comprises applying a heated raised form to the surface of a-plate in the pres` ence of an adhesive which is solid at normal temperature but Huid at substantially the temperature of the form.

8. The method of forming a mold face which comprises applying a heated raised form to the surface of a heated plate in the presence of an adhesive which is solid at normal temperature but fluid at substantially the temperature of the form.

9. A mold boxA comprising a structure having a Wall surface, a detachable form applied to said surface, and a moisture-resistant adhesive securing said form in position in said surface.

10. A mold box comprising a structure having a Wall surface, a detachable form applied to said surface, and a marginal fillet of the adhesive material which secures said form in position on said surface.

11. A mold box comprising a metal mold surface, independent metal forms applicable to said surface, said forms having fiat faces adapted to lie flush against said surface, and marginal fillets of moisture-resistant adlfiesive uniting said forms to the mold surace.

12. For use in a mold box having a fiat mold surface, a raised form 'havin a fiat face adapted for juxtaposition agalnst the mold surface in any desired position thereon, and an adhesive such as paraffin for detachably securing said form in position on said surface and for forming a concave marginal fillet, the surface of Which merges from the lateral surface of the form to the flat mold surface upon which it rests.

In testimony whereof I have signed my name to this specification.

GEORGE N. LEMMON.

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