DE714213C - Expandable core for the production of hollow blocks - Google Patents

Description

Expandable core for the production of hollow blocks The invention relates to an expandable core for the production of hollow blocks, which is used for this serves, the molded stone mass by expanding the core walls and thereby to compress the pressure exerted from the inside, so that the ramming work is significantly reduced or can be omitted entirely.

The expandable cores of this type previously known were only set up or passed for regular prismatic or round cross-sections from an inflatable rubber bag, with which an always uniform and certain Can not achieve cavity in the stone. According to the present invention, an expandable Core are created, which also with a very irregular cross-section shape the ore allows more uniform prescribed cavities in the stone.

The essence of the invention is that in a sheet and straight composite outline of the core cross-section with the curved shell parts flat jacket parts are connected, either against each other or to the curved shell parts are transversely displaceable, Lind that the curved shell parts can be shifted outward parallel to oneself by I) back!

For the purpose of evenly distributing the amount to be exercised on the outer surface Pressing effect grip the pressure members in the middle or in several places the core height to the shell parts. For the individual jacket parts is depending on their Local position in the core circumference is the correspondingly different size expansion for expansion provided, with strips or the like attached to the casing parts, the casing parts are guided displaceably in a base plate. About all parts of the periphery can a common skin made of stretchable and contractible material (e.g. rubber o. the like.) extend.

Because with the new core the formation of any shape Core cross-sections is possible, the recesses in the stones can be any Shapes received, whereby the stone structure better with the expected stresses adapted and thus saved in building material, both in stone material as also on iron inlays, as far as they are provided. It is essential that the hollow stones with core holes by machine in volume production by pressing the stone walls of be molded inside out. can, with the stone mass to its correct wall thickness is compressed under great force.

Exemplary embodiments of the subject matter of the invention are shown in the drawing shown.

Fig. I shows an embodiment in section along line I-I of Fig. a. Fig. 2 shows a vertical section along line II-11 of Fig. i.

Fig.3 shows a vertical section along line 111-11I of Fig. 2.

Fig. D. - Tends to have a different core formation, mainly in the long side external view. Fig.; is a vertical cut.

Fig. 6 is a horizontal section. Fig.7 shows details, partly L. cut. in a somewhat larger 'Marstab.

In the case of the core design shown in FIGS. I, 2 and 3, the core sheath consists of flexible material, preferably steel strip or the like, namely of the two parts i and?, Which can move relative to one another. The whole is expediently covered with a rubber skin 3, which is sufficiently stretchable: a lever device is provided inside to expand the core. .A bolt 4 sits firmly on the base plate 17 of the core, over which a sleeve extends; pushes, with the interposition of a compression spring 6. Joint heads 7 are attached to the sleeve, to which the links 8 are connected at one end. The other ends of the handlebars 8 grip the casing parts i and 2, specifically on the casing part i directly and on the casing part? with the help of a double hinge 9, io in such a way that when the joint 9, 1o is moved outwards, a knee-joint effect occurs and the casing part 2 is expanded, as shown by dashed lines in Fig. i ii1. The kernmantle part i has the joints i i in its two side parts. The main movement for the expansion of the distance takes place by pressure on the sleeve 5 from above, so this rides the joint heads 7 are depressed. Are to the sides. on the one hand on the sleeve; and on the other hand wedge pieces 12 and 13 are also provided on the jacket. As a result of this: wedge pieces in connection with the other parts of the device, the bus-width of the core is possible in such a way that the pressure is exerted uniformly on all sides and at the same time. As soon as the pressure is released and the sleeve 5 is released. Due to the reaction of the spring 6, the circumferential jacket parts i and 2 move into their inner position. The core is thus contracted to its smallest form. The rubber outer skin 3 also acts in the same way.

The mutual guidance of the core shell parts i and 2 is thereby achieved, the shell part i rivets 18 o. The like. Has the shell parts in accordingly arranged slots 19 slide. Next are to guide the 'shell parts i and 2 during leaning and contraction, advantageously lllc-clle 14 and 15 o. The like. Provided, which lead into slots 16 of the base plate 17. The guide plate 15 engages in the hinge 9, io of the shell part 2. DieWandieile i and 2 are standing with their lower edges uni a very small amount over the base of the mold, so with certainty the Aucweitversehungen the walls are possible.

The core shown in Figs. I to 3 is, for example, a so-called core End core. Of course, the central core differs somewhat from such end cores, namely, that the toggle-like acting joint 9, io not only on the part 2 of the core sheath. But also provided on the opposite side of part i will. It is also possible to use such hinges on all four core walls.

In the embodiment shown in Figures 4, 5, 6 and 7, several pressure cylinders 28 are provided on a '-center piece 27 corresponding to the shape of the core, the pistons 30 of which are pressed into the initial position by springs 29 on their rods 31 with special heads 32 , have, on which sheet metal curve pieces 33 are stuck. The curve pieces 33 are connected to one another by cladding plates34, namely movably by the arrangement of pins 35 and slots 36. A distributor piece 38 to be connected to a pressure line sits on the # -% littelstüück 27 finitely interposed valve 39. From the distributor piece lead individual pressure lines. en .1o according to the various printing cylinders 28. B. by means of a liquid or by means of Prerluft, the total wall of the core can be expanded by a certain amount, so that the stone building mass receives a corresponding compression within the Steinformrnteile.

Claims (1)

PATENT CLAIMS: i. A11worldly core for the production of hollow blocks made of concrete o. The like. And to generate a pressure on the molded mass, thereby marked, that is, an outline of the composed of arcs and straight lines Core cross-section with the curved shell parts flat. Block parts of the jacket Are, clie-either against each other or to the bent parts (e.g. by means of rivets, which slide in slots) are transversely displaceable, and the curved .mantelteile by means of pressure elements (e.g. levers, wedges or pressure pistons) parallel outwards can be moved towards you. 2. = @ usii: owable core according to claim 1, thereby marked. dar for the purpose the even distribution of to be exerted on the shell parts pressing the pressure members in the middle or also attack the shell parts at several points along the core height. 3. Expandable Core according to claims i and 2, characterized in that for the individual Circumferential jacket parts depending on their location on the core circumference a correspondingly different large elongation is provided for expansion. .4. Expandable kernel according to the An = speak i to 3, characterized in that the shell parts by means of the shell parts attached strips or the like (i6) in a base plate (i7) slidably guided are.