US2486038A - Molding form for use in producing concrete burial vaults and the like - Google Patents

Description

Oct. 25, 1949. c. A. LANDON 2,486,038

MOLDING FORM FOR USE IN PRODUCING CONCRETE BURIAL VAULTS AND THE LIKE Filed Feb. 25, 1947 2 Sheets-Sheet 1 Oct. 25, 1949. c. A. LANDON 2,486,038

MQLDING FORM FOR USE IN PRODUCING CONCRETE BURIAL VAULTS AND THE LIKE Filed Feb, 25, 1947 Q 2 Sheets-Sheet 2 /a Y /a 1 FIG. 47.

3mm I 5 (karlasflQLan don/ mama mw m Patented Oct. 25, 1949 MOLDING FORM FOR USE IN PRODUCING CONCRETE BURIAL VAULTS AND THE LIKE Charles A. Landon, Columbus, Ohio Application February 25, 1947, Serial N 0. 730,800

2 Claims. (01. 25-130) This invention relates to molds or forms for use in the casting of concrete articles or devices and, more particularly, to the formation of concrete burial vaults.

Molding forms hitherto used in the formation of the open-bottomed hood sections of concrete burial vaults have been objectionable in several important respects, particularly in the matter of the difficulty encountered in their use when removing the forms from the molded concrete bodies. Usually, the forms must remain within and around the concrete body for extended periods of time, that is, until the body, following pouring, sets and hardens to a degree permitting the connected form members to be separated from contact with the walls of the concrete body and removed therefrom.

Such molding forms include an internal metallic core section and an outer form section having side and end walls which are spaced from the adjacent walls of the core section. After the setting and hardening of a concrete body formed between said section, the outer section is removed from contact with the body so that the latter may be lifted to remove the same from the internal core section. During such lifting operations, the tendency has been for the walls of the concrete body in contact with the core section to scale or score, leaving substantial deposits thereof in adherence with the walls of the core section, a condition rendering the cast body unsuitable in many cases for usage.

The present invention, therefore, has for its objects, among others, to provide an improved mechanical molding form for producing the hood sections of concrete burial vaults wherein improved means are provided of a mechanical nature by which the side and end walls of the internal form or core section are flexed laterally and inwardly in a manner to break adherence with the cast concrete body in contact therewith, whereby to avoid injury to the latter in the operation of removing the cast body from the form; to provide a molding form of this character in which the wall-flexing means for the core section is so constructed that, following inward flexing of the core walls, the entire core section may then be moved vertically and downwardly to break adherence between the top wall of the core section and the adjacent top wall of the cast conment with the outer walls of a cast concrete body, so that following the releasing of the walls of the core section, and the outer side and end walls from engagement with the cast body, the latter is rendered freely accessible for a lifting operation in which it is removed completely from the molding form; and to provide a molding form which permits of rapids production of cast concrete bodies and in which the form remains in active position in contact with the cast body for a reduced period of time as compared with the forms of the prior art, whereby to permit a single molding form to be used in a given period of time in a greater number of molding operations than is now possible with conventional apparatus.

With these and other objects and advantages in view, the invention consists in the novel features of construction, combinations of elements and arrangements of parts hereinafter more fully described and pointed out in the appended claims.

In the accompanying drawings:

Fig. l is a top plan view of a molding form for producing cast concrete articles, and constructed in accordance with the present invention;

Fig. 2 is a vertical longitudinal sectional view taken through the molding form;

Fig. 3 is an end elevational view thereof;

Fig. 4 is a vertical transverse sectional view taken through the form on the plane disclosed by the line 6-4 of Fig. 2;

Fig. 5 is a detail vertical transverse sectional view on an enlarged scale and disclosing more particularly the cams employed for flexing the side walls of the core section of the form;

Fig. 6 is a sectional view on the plane indicated by the line 6-6 of Fig, 5;

Fig. '7 is a detail horizontal sectional view on the plane indicated by the line 'il of Fig. 3.

Referring more particularly to the drawings, my improved molding form in a preferred embodiment comprises a base frame It composed of angle irons and substantially rectangular in configuration. Positioned on the base frame is a platform II which, also, is substantially rectangular in configuration, being composed of longitudinally extending angle irons l2 and a plurality of relatively spaced transversely extending angle irons [3, all of which being rigidly united. The horizontal webs of the angle irons l2 and the end angle irons l3 are formed with openings M, which loosely receive positioning studs I5 carried by the lower edges of the outer vertically disposed side plates it of the molding form and the adjoining vertically disposed end plates [1 thereof. The upper edges of the plates l6 and I! may be formed with outwardly and downwardly directed flanges l8 for reenforcing and handling purposes. Also, the end. plates, and the side plates if desired, may be formed with outwardly directed shoulder-producing formations [9.

The side plates I6 have their vertical end edges, as shown in Fig. 7, formed with laterally turned flanges 20 which terminate in inwardly directed angularly disposed webs 2|. To fasten the adjoining edges of the side and end plates in a detachable but rigidly joined inanner, use is madeof end yokes 22. The ends of these yokes terminate in laterally extending lugs 23, which are formed with threaded apertures for the :reception Of clamping screws 24. The inner ends er these screws bear on the angular webs 2| of the flanges 20. When the screws are tightened, the side plates L6 are forced against the edge flanges "of thej'erid plates inj a firm and'securem'anii'e'r.

By this "cdnstruction, the outer walls of the Iiioldi ng form 'are retained in rectangular order 'during 'castin'g and setting operations, and when these operations have been completed, the screws 2'4 are'loos'end and the yokes22 removed, so'that the side and end plates may oscillate about the axesprovided by the positioning of the studs "15 in the. openings [4 of the platform, thus removing the side andf'end plates from engagement with a cast cementitious body produced in the form.

In association with the outer walls of the form, use is 'm'ajde of an inner form or core section 25. ThisjCdr section is formed preferably fromjsheet metal and comprises an open-bottomed structure having vertical side walls '26, end walls 2l and an arched top wall'2'8. The side and end w'alls'26 and 27 of the core section are appropriately spaced fromthe'side plates I 6 and the end plates 'll forming the'outer walls of the molding or' 'c'asting form, whereby to provide spaces 29 forfthe reception of the'cementitious mixture which is poured into such spaces for the purpose of producirlgjthe hood section30 of aconcretegrave vault. Thejbottomsjofthe spaces 29 are "closed by means "ofa rectangular frame 3!, which is substantially T-shape'd in cross-sectional configuratioh, the frame'3l resting loosely on the plato mil Following-the pouring of the cjementitioi'l's 'mixture forming the hood section 30,'and the subse- "quent 'settingand hardening period therefor, and when it is desired to remove the molded "hood "s'ection'from theform, the "side walls 26 andthe end walls "21 'of the core section are first flexed inwardly and laterally for the purposeof breaking any v adherence between these walls and the 'cementitious body. Such flexing may be accomplished advantageously by mounting rotatably'in the transverse angle members I3 of the platform a I pair of spaced longitudinally extending shafts 32. v

As shown more particularly in Figs. "and 6, these shafts have fixed thereto at longitudinal intervals pairs of spaced disks 33, each disk being formed with a hub 34, which is pinned as at '35 to one of the shafts 32. Each complemented-"pair of disks carries studs 36, which receive roller sleeves 31. These sleeves are disposed for engagemen't with the inner surfaces "of substantially square, ringlike cam members 38, the latter being w'elded or otherwise permanently secured to "the lower ends of "bars 39, 'whichare rigidly fastenedto the inner surfaces 'of the sidewalls '26. The shafts 32 are provided at one end-0f "the form with manipulating handles 40, by which the shafts may be conveniently rocked. By reference to Fig. 4, it will be noted that when the shafts are rocked to position the roller sleeves on the outside, the side walls 26 will be flexed, or caused to assume true vertical positions in parallelism with the side plates 16. However, as shown in Fig. 5, when the shafts 32 are rocked to position the sleeves 31 on the inner sides of the cam members 38, the side walls'are flexed laterally about their regions of joinder with the top wall 28, thus removing the side walls from adhering engagementwith'th'e surfaces of the concrete body 30.

The end walls 2'! are similarly flexed by the provision o f the screws disclosed at 4|. These screws are mounted in threaded openings provided therefor "inthe end members of the platform II, and the inner ends of the screws press on'the lower flexible portions of the end walls 21 to flex the latter inwardly and free the same from adhering engagement with the cast c'oncrete b'ody. ti After such lateral 'fiexing of the side and end walls 26 and 21 of the'core section, the-latter is moved downwardly and vertically by continuing the rocking-aetionof the's'hafts '32, so that the 'rollered sleeves 3T 'willeng age with the 'lower'portions of the cam members 38, thusr'emoving the arched top Wall 28 of thecore section from'adhering engagement with the cementitious top wall of the hood'section'flfl. Following such release of the core section of the molding form, the side and end plates I6 and I! are disconnected "by removing the end yokes '22, allowing these plates to swing upwardly and laterally or, if desired, to'be removed entirely 'from'the platform I l. The formed vaultsectionmay thenbe removed from the form by' engaging'ca-ble means, not shown, with the shoulders 42 formed on the ends of the hood section 30'bythe'b'eveled-formations IQ of the end plates l'l. Thecablemeans may form a part'of'a commercial hoist or crane, by which the completed hood section may be lifted and transferred to desired positions of deposit.

lit will'thusbe seenthat'the present invention provides a readily assembled forming means for the casting of various concrete articles, such, for example, as vault sections, although theapparatus'is not ,liinted to this particular use. The "apparatus may bequic'kly Set up to permit of a given pouringoperation, and upon the conclusion of this operation, and the subsequent setting a d hardening period, the vault may be "conveni'ently removed from the forming-manner preventing injury to the cast product, this object being attained-primarily by'the lateral flexin of the walls of the core section before the core-section is lowered to release the top wall jthereof froineng agemeht with the top wall-of the cast product, and, also, by the outward l'ateral movement of the etterside and'end plates "I 6 *and 'll of the form.

I l m 1, In apparatus for molding hollow cementitious bodiesfia base, an'openbottom core positioned on-said base, said core embodying-side, end and top walls bf-sheet metal, a pairof longitudinally extending transversely spaced rock shafts journaled in bearings "carried by saidfbase, bars secured to the 'innersurfaces'ofthe sidewalls of said core, cam extensions formed with (the lower ends of said bars and through which extensions said rock shafts pass disk'means "disposed in registration'with 'said'bars and'rotatable with said shafts, and transversely disposed studs carried by said disk means and engageable with said cam extensions to flex the side walls of said core inwardly upon initial movement of said rock shafts in one direction and move said core downwardly upon the following movement of said rock shafts in the same direction.

2. In a form for molding cementitious articles, a base frame, an open bottom core positioned on said base frame, said core embodying side, end and top walls forming a unitary one-piece structure, said side walls having limited flexibility in a lateral direction, substantially rectangular cam devices carried by said side walls contiguous to their lower edges, rock shafts journaled in said base frame and extending through said cam devices, and studs positioned in said cam devices and rotatable with said rook shafts for flexing said side walls inwardly upon initial rotation of said rock shafts in a given direction and move the core bodily downwardly toward said base frame upon continued subsequent movement of said rock shafts in said given direction.

CHARLES A. LANDON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,219,106 Kruckenberg Oct. 22, 1940 2,344,738 Seifert Mar. 21, 1944 2,461,928 Schopf Feb. 15, 1949

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