Patent Publication Number: US-9415527-B2

Title: Method for producing concrete blocks

Description:
TECHNICAL FIELD 
     The invention relates to a method for producing concrete blocks as claimed in claim  1 . 
     The present invention also relates to a method which employs a storage container with a receiving space for a plurality of layers of different-colored concrete for use in a device for producing concrete blocks as claimed in claim  5 . 
     BACKGROUND OF THE INVENTION 
     A device of the type in question, and an associated method of the type in question are known from EP 1 017 554 B1. 
     Conventional methods for producing concrete blocks, and in particular paving stones, building blocks or the like, provide, in most cases, a basic body which is formed from coarse concrete, and is then provided on the upper side with a solidly covering facing layer of colored concrete or concrete mortar. In this case, provision is made for the coarse concrete to be poured into a mold and compacted in the mold by shaking and/or pressing. This causes the coarse concrete to sink. In the lowered space of the mold, the colored concrete mortar is then applied to the coarse concrete as a facing layer and compacted from a storage container which is also referred to as the facing container or facing silo. 
     It is known to use gravity to remove from the storage container dyed concrete or concrete mortar as a facing layer for concrete blocks. In the case of a multicolored facing layer, for example, if a marbled facing layer or a color mix is to be achieved, concrete or mortar masses are introduced into the storage container, separately, color by color, and then supplied to the molds in a blended, or unblended form. 
     Furthermore, it is known to use for each colored concrete its own additional container from which the desired amount of concrete is dispensed in each case. 
     The described methods and devices have in common the drawback of high machine and production-related costs. In addition, many of the facing layers which are achieved display undefined color patterns as a result of disadvantageous blendings, for example as a consequence of heap formations. 
     A storage container forming a receiving space for a plurality of layers of different-colored concrete is known in the general art. In this regard, the floor of the storage space is typically embodied as a slide. Once the storage space has been filled with the various layers of concrete, the slide is opened continuously or cyclically, so that gravity causes partial amounts or portions of the enclosed layers to fall downwardly and then be supplied to a downstream release device. The downstream release device can have a closure member which is embodied for controlling a quantitative, portionwise release of the colored concrete, or concrete mortar, and which then fills the molds. The configuration of the storage container with a slide causes only comparatively low machine costs, and leads to improved through-mixing of the layers of different-colored concrete. Nevertheless, the blending of the layers of different-colored concrete is not yet sufficiently advantageous. Further heaps are in particular formed. This applies in particular to the first partial amount that falls downwardly when the slide opens. For this first partial amount, only a slight amount or insufficient blending typically takes place. 
     In order to further improve the blending, the generic document, EP 1 017 554 B1, proposes combining the slide known from practical experience with impact bodies arranged in the path of movement of the partial portions of the concrete layers that move downwardly as a result of gravity. In this case, the partial portions of the concrete layers are intended to strike the impact bodies in such a way that the partial portions are guided onto a deflecting curve and blended with one another more effectively. 
     The solution known and taught from EP 1 017 554 B1 further improves blending, but leads to higher machine and design costs. In addition, there is also the problem that, in particular, the first partial amount of concrete or concrete mortar that is let out through the slide displays a disadvantageous blending. The blending is improved only over the course of the further letting-out of partial portions of the layers. However, as the receiving space of the storage container has only a limited size, paving stones with a facing layer displaying a color blending which is different to, i.e. less advantageous than, the remainder of the batch are produced frequently, that is to say whenever the first partial amount is let out of the storage container. 
     SUMMARY OF THE INVENTION 
     The present invention is therefore based on the object of providing a method for producing concrete blocks that allow a plurality of layers of different-colored concrete to be blended with one another in the desired manner, and at low cost, and in particular in order to produce facing layers having a defined, uniform appearance for concrete blocks. 
     With regard to the device, this object is achieved by claim  1 . 
     An advantageous storage container for use in the disclosed method for producing concrete blocks is understood from claim  5 . 
     A targeted and defined amount of concrete made up of different-colored layers may be let out of the receiving space of the disclosed storage container as a result of the fact that at least a partial portion of a side wall of the receiving space is provided with at least one dispensing opening for dispensing a partial amount of the layers, and the size of passage of the dispensing opening is variable by a dispensing means which is provided. 
     For purposes of the present application, the term “concrete” refers equally to concrete mortar or mortar or another pourable material for producing blocks, and in particular paving stones, building blocks, and the like. 
     Because the at least one dispensing opening is arranged in the side wall, concrete made up of the different-colored layers can fall out of the receiving space of the storage container without the concrete falling—as was the case in the prior art—out of the storage container in the order in which the concrete is stored there, layer by layer. The dispensing opening in the side wall can for example allow concrete made up of the different-colored layers to fall downwardly under the influence of gravity simultaneously. However, it is also possible for firstly opening the dispensing opening in the side wall, the dispensing opening being associated with the top layer, to be opened and subsequently—after a time delay—partial amounts of layers which are positioned deeper or positioned, therebelow, to be dispensed through the dispensing opening. It is thus possible for partial amounts of the various layers of colored concrete to arrive simultaneously at the end of their path of movement or flight and for a desired, for example uniform, blending to be accomplished as a result. A temporally offset opening may be achieved, for example, by arranging the dispensing means obliquely to the dispensing opening or obliquely arranging the opening edge of the dispensing means. 
     In principle, the method according to the present invention allows any desired blending to be set. What matters in this regard is that, in particular, the mixing ratio of the first partial amount of the concrete removed from the receiving space of the storage container is no longer dependent upon the layer closest to the floor of the storage container first being let out or released. 
     According to the teachings of the present invention, a provision may be made for the dispensing means to open and close the dispensing opening cyclically for predetermined time periods in order to dispense a partial amount of the layers during the defined opening cycle. As a result, it is possible to let out, in each case, a defined amount of concrete from the individual layers. 
     Furthermore, in another development of the invention, a provision may be made for the side wall provided with the at least one dispensing opening to be inclined in relation to a vertical plane. The inclination of the side wall provided with the dispensing opening allows partial amounts of the different-colored layers of concrete to be dispensed particularly effectively, and independently of the layer arranged in each case, thereunder. 
     In principle, a provision may also be made for merely the partial portion of a side wall in which the dispensing opening is arranged to be inclined. 
     Furthermore, a provision may be made for a plurality of side walls or partial portions of a plurality of side walls to be provided with dispensing openings. In this case, one or more side walls can be accordingly inclined. 
     The inclination of the sidewall, as discussed, above, advantageously also allows, in the case of two layers positioned one on top of the other, in each case the upper layer adjoining the side wall to form an overhang protruding horizontally beyond the lower layer. Gravity can then cause this overhang to fall downwardly, and independently of the layer positioned thereunder, when the at least one dispensing opening is opened by the dispensing means. In addition, and in an advantageous manner, the overhang can further cause concrete to slip down and fall through the dispensing opening. If appropriate, provision may be made for the dispensing means to open and subsequently close only for a defined time. During a further opening cycle, the concrete which has slipped down can thus be dispensed in a defined manner. 
     It is advantageous in the practice of this methodology if the inclination of the side wall is variable. 
     A variation of the inclination may be advantageous, for example, as a function of the composition of the concrete, for achieving a desired blending. An alteration of the inclination allows, inter alia, the visual effect of the concrete block to be varied, for example a marbling or a uniform blending to be achieved. Furthermore, provision may be made for the inclination to be varied as a function of the filling level, for example when a defined partial amount has already been released from the receiving space of the storage container. 
     The inclination of the side wall may, for example be, 5 to 70 degrees, and preferably 5 to 35 degrees. These values have proven to be particularly suitable with regard to the desired uniform blending, and also in consideration of the desired partial amount which is to be dispensed through the dispensing opening in the side wall. 
     As an alternative, or in addition to the inclination of the side wall, a provision may also be made for the receiving space or the storage container to be inclinable or pivotable or tiltable in the direction of the side wall provided with the at least one dispensing opening. This can be achieved for example by appropriate turning of the receiving space or rotation. Bearings and/or shafts/hinge pins, and the like, and which are known to the person skilled in the art can be used for this purpose. In this case too, it may be advantageous if the inclination or the rotation of the receiving space in the direction of the side wall provided with the dispensing opening is variable. It is in this case also possible to incline or to rotate the receiving space sufficiently far in the direction of the side wall provided with the at least one dispensing opening for the side wall provided with the dispensing opening to form the floor of the receiving space. A visual strip effect, for example, may be achieved by using the solution according to the invention in this way. 
     According to the teachings of the present invention, a provision may furthermore be made for the outer walls delimiting the receiving space (i.e. the side walls, the floor and if appropriate a cover) to form at least approximately a spherical shape or an arc of a circle shape. This is advantageous, in particular, when the receiving space is to be rotated or inclined in the direction of the side wall provided with the at least one dispensing opening. For this purpose, it is not absolutely essential for the entire receiving space to have a spherical shape; it is sufficient if the receiving space has at least approximately a spherical shape over the angular range over which the receiving space is to be inclined or rotated. The mechanical complexity, in particular the bearings for rotating the receiving space, is simplified as a result. 
     According to the teachings of the present invention, a provision may furthermore be made for the side wall provided with the at least one dispensing opening and/or an opposing side wall to be movable in order to vary their distance from each other. As a result, it is, if required, possible to additionally supply concrete to the dispensing opening by reducing the distance between the side walls. Alternatively, a movable partition can also precede the opposing side wall. Furthermore, alternatively or additionally thereto, shaking or vibration may also be provided or imparted in order to supply, if appropriate, further material to the dispensing opening in the side wall. 
     It is advantageous if the at least one dispensing opening runs substantially horizontally or vertically in the side wall. A horizontal arrangement of the at least one dispensing opening allows a partial amount of concrete to be let out in a targeted manner from each layer of different-colored concrete. In a horizontal arrangement of the dispensing opening, it is advantageous if the side wall has a plurality of dispensing openings, so that a dispensing opening can be associated with each layer of multicolored concrete. It is in this case also conceivable for a respective horizontally running dispensing opening to be arranged at an interface between two layers, so that a partial amount of concrete can be let out from both layers by opening the dispensing opening. 
     Furthermore, it is advantageous if the side wall is provided with a plurality of dispensing openings running substantially parallel to one another. A uniform blending of the layers may thus be achieved irrespective of the course of the dispensing opening in the side wall. 
     According to the teachings of the present invention, a provision may furthermore be made for the dispensing openings to form pockets, channels or guides through which gravity causes the layers to fall downwardly. A particularly advantageous configuration of the dispensing openings, or the side wall provided, therewith, can consist in the side wall having two walls arranged at a distance, one after the other, the first wall facing the receiving space, and being provided with the dispensing openings, and the second wall guiding the concrete falling in through the dispensing opening. The wall facing the inner side of the receiving space can be provided between the dispensing openings with guide or stabilizing webs. These webs can, if appropriate, also be connected to the rear wall, so that channels or pockets are formed for guiding the concrete as it falls out. However, it is in this case advantageous if the pockets are not closed, but connected one over another by apertures in the stabilizing webs, or the stabilizing webs extend only over a part of the height, so that the pockets do not obstruct, and in particular do not clog, the falling-down motion of the concrete. 
     According to the teachings of the present invention, a provision may be made for the dispensing means to be embodied as swords, drawing sheets, slides, hinges or the like. An embodiment of this type has proven advantageous in order to be able to rapidly and easily open, and close, the dispensing openings. However, and in principle, the dispensing openings can be closed in any desired manner. 
     It is advantageous if the dispensing means are rendered suitable for continuously varying the size of the passageway of the dispensing opening. This allows the partial amount to be dispensed from the layers of different-colored concrete to be advantageously controlled. However, in principle, it is also possible to configure the dispensing means in such a way that the dispensing means can perform merely a simple open/close operation. 
     It is furthermore advantageous if a dispensing means is associated with each dispensing opening. The dispensing means can, in this case, be controlled separately from, or together with, the other dispensing means. Separate controlling of the dispensing means allows, in particular, and in the case of a horizontal orientation of the dispensing openings in the side wall, only one layer, and thus only one concrete color to be supplied, if appropriate, and in a targeted manner, to the subsequent release device. 
     In a preferable configuration of the present invention, a provision may be made for the dispensing means to be connected to one another, and then rendered jointly movable. It is thus possible to open and to close a plurality of dispensing openings at the same time. 
     It is also advantageous if the dispensing means are embodied as a connecting link having passage openings formed therein. In this arrangement, the connecting link is adjustable or displaceable to the side wall provided with the dispensing openings in such a way that the size of passageway of the outlet openings results from the overlap thereof with the passageway openings of the connecting link. A displacement of the connecting link parallel to the side wall is particularly preferable. A configuration of the dispensing means as a connecting link also allows a particularly simple actuation in order to open and to close the dispensing openings, or in order to set different sizes of the passage or passageway. 
     According to the teachings of the present invention, a provision may furthermore be made for the dispensing means to be provided with projections, pins, springs or the like, which are oriented toward the layers, in order to loosen up the layers in the region of the dispensing means. This configuration is also particularly expedient when the dispensing means are embodied as a connecting link, or in a connecting link. A displacement of the connecting link parallel to the side wall causes the projections, pins and the like to loosen up the concrete adjoining the connecting link, so that the concrete can advantageously fall through the dispensing openings. 
     In an alternative or additional configuration of the present invention, a provision may also be made for the dispensing means to be embodied as rotatable shafts, rollers, or the like, and which vary the size of passage or passageway of the dispensing opening as a function of the rotation. A provision may, in this case, also be made for the shafts to have means in order to convey partial amounts of the layers through the dispensing opening. The means as provided can, in this case, be configured, for example, as blades, projections, mandrels and the like. These may be similar to a water wheel or the vanes of a vane cell pump. A provision may also be made for the two respective shafts to cooperate in mutual engagement. 
     In another possible form of the invention, means can furthermore be provided in order to fill the receiving space with layers of the different-colored concrete, the layers being as uniform as possible. This can be carried out in various ways; and particular preference is given to a configuration of the means as guide sheets which are arranged above the receiving space, and which ensure, as soon as the different-colored concrete is poured in, that substantially uniform layers are formed. The layers can in this case also have a differing thickness. This may, for example, be the case if the same amount of concrete for each layer is in each case poured in, but the areas of the layers are different on account of the inclination of the side wall. It is advantageous if the thickness of a layer is constant. 
     It is also advantageous if the floor of the receiving space is embodied as a slide. Concrete which cannot be dispensed or is not intended to be dispensed through the output openings in the side wall can be removed through the slide. The removal is, in this case, carried out in such a way that the slide is slid into a position in which the slide releases or reveals an opening slot, so that gravity causes partial portions of the concrete contained in the receiving space to fall down, therethrough. 
     It is also advantageous if the slide is transversely movable, thus allowing the formation between side walls, and the slide, of a variable opening slot through which gravity causes partial portions of the layers to fall downwardly therethrough. 
     It is advantageous if the receiving space is formed in a substantially funnel-shaped manner and which increases in cross-sectional dimension when measured from the bottom, and toward the top thereof. 
     The solution according to the invention is particularly suitable also for retrofitting existing devices for producing concrete blocks, and in particular, paving stones. For this purpose, the storage container with the receiving space for a plurality of layers of different-colored concrete is integrated into the existing device for producing concrete blocks. This can be carried out in a simple manner in that the storage container having the features according to the invention is mounted above the existing storage container which is frequently also referred to as the facing container. From the storage container having the features according to the invention, the concrete can then be dispensed into the existing storage or facing container or arrives there in the desired blended composition. 
     The side wall which is provided in accordance with the methodology of the present invention with the at least one dispensing opening does not necessarily have to be a side wall which is at the same time an outer wall of the receiving container or surrounds the outer circumference of the concrete which is introduced in the receiving space. It is also conceivable for the side wall to be an inner wall in the receiving space, and wherein the inner wall is embodied as a partition, for example. The partition may be accordingly inclined. The inner wall can be embodied, in particular, in a tower-shaped, dome-shaped or conical manner and arranged in the receiving space. 
     The side wall can be embodied (preferably also in an inclined manner) as any desired vertically running wall which is connected to the layers of different-colored concrete that are introduced in the receiving space, or can adjoin the different-colored layers of concrete. 
     In the advantageous method for producing concrete blocks, of the present invention, a provision is made in accordance with the invention for at least a first partial amount of the layers to be dispensed from the storage container as a result of the fact that at least one dispensing opening is opened in at least a partial portion of a side wall of the receiving space. In this case, it is advantageous if the at least one dispensing opening in the side wall is opened in such a way that, from each layer of different-colored concrete, a substantially uniform or desired amount falls through the dispensing opening. 
     Furthermore, it is advantageous if the at least one dispensing opening opens in such a way that the opening extends substantially in the vertical direction in the side wall, so that, from each layer of different-colored concrete, a partial amount falls into the dispensing opening irrespective of the lower layer in any given case. In the method according to the present invention, it is advantageous if the side wall provided with the at least one dispensing opening is inclined or can be inclined in such a way that, in the case of two layers positioned one on top of the other, in each case, the upper layer adjoining the side wall forms an overhang protruding horizontally beyond the lower layer. 
     The further features described with regard to a device according to the invention can be used in a similar manner and also employed as method steps. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWING 
       Advantageous configurations and developments of the present invention will emerge from the further dependent claims. The operatory principle of the exemplary embodiments of the present invention will be illustrated hereinafter with reference to the drawings, in which: 
         FIG. 1  is a side view illustrating the principle of a device which is employed in the method for producing concrete blocks; 
         FIG. 2  is a perspective view of a storage container according to the teachings of the present invention; 
         FIG. 3  is a plan view onto a side wall and showing dispensing openings and the dispensing means for opening and closing the dispensing openings; 
         FIG. 4  is a view, from above, onto a side wall provided with a plurality of dispensing openings, and wherein the dispensing openings can be opened and closed by a connecting link-type dispensing means which is arranged, displaceably, at the front of the side wall; 
         FIG. 5  is a sectional illustration of a device for dispensing different-colored concrete into a mold; 
         FIG. 6  is a further illustration according to  FIG. 5 , and which shows a floor of the receiving space being partly opened, and the floor being embodied as a slide; 
         FIG. 7 a    shows a detail of a partial portion of a side wall provided with a dispensing opening, the dispensing means being embodied, for closing the dispensing opening, as a shaft; 
         FIG. 7 b    is an illustration according to  FIG. 6 a   , and wherein the dispensing opening in the side wall is closed by two mutually engaging shafts; 
         FIG. 8 a    is a sectional illustration taken along line VII-VII of  FIG. 6 b   , and wherein the shafts engage each other in such a way that the dispensing opening is closed; 
         FIG. 8 b    is an illustration of the shafts according to  FIG. 7 a   , and wherein the shafts are rotated in such a way that the dispensing opening is completely opened; 
         FIG. 9  is a top plan view of the floor of the receiving space, and wherein the floor is being embodied as a slide, and wherein, further, the slide has a triangular recess, and an adjoining side wall is provided with a prismatic or semi-conical projection interacting with the triangular recess of the slide; and 
         FIG. 10  is a top plan view of an alternative embodiment of the side wall provided with the dispensing openings. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Devices and methods for producing concrete blocks, and in particular paving stones, building blocks and the like, have long been known in the general art, so that only the features essential to the invention will be examined, hereinafter, in greater detail. In this regard, reference is made for example to EP 1 017 554 B1. 
       FIG. 1  shows a basic principle of the device according to the invention. In this case, a container  1  is provided and which serves to receive a source of coarse concrete  2 , or no-fines concrete which can be released to a mold  4 , and which is arranged under the container  1  via a closure member  3 . 
     Once it has been filled with coarse concrete  2 , the mold  4  is supplied, in a known manner, to a shaking and/or pressing station  5 . The coarse concrete  2  is then compacted in the pressing station  5  as a result of the shaking and/or pressing. The space in the mold  4 , that is, in this case, created above the compacted coarse concrete  2  serves to receive colored concrete  6  or concrete mortar. The concrete  6  or the concrete mortar is, in this case, also referred to as facing concrete or facing concrete mortar. 
     As may be seen from  FIG. 1 , the colored concrete  6  is stored in a storage container  7  in order to form the facing layer. In this case, a provision is made for a plurality of layers  9 ,  10 ,  11 ,  12  and  13  of differently dyed concrete, which are jointly used to form facing layers for paving stones, to be stored in the storage container  7  or in a receiving space  8  of the storage container  7 . The layers  9 ,  10 ,  11 ,  12  and  13  rest in this case, stored one, over another, on a floor  14  of the receiving space  8 . Below the floor  14  of the receiving space, the storage container  7  has a cylindrical or funnel-shaped extension  7   a  leading to a dispensing device  15  with a closure member  16 . The closure member  16  closes the lower end of the storage container  7 . The closure member  16  serves to control a quantitative, portionwise release of colored concrete mortar from the storage container  7  into the mold  4 . The closure member  16  can, in this case, open and close the lower end of the storage container  7  in any desired manner, for example, as a result of displacement or pivoting of the closure member. 
     In one configuration (not illustrated in greater detail), a provision may also be made for the funnel-shaped extension  7   a , as illustrated in  FIG. 1 , of the storage container  7  to be a storage container which is independent of the storage container  7 , and in particular in the manner in which storage containers are used in conventional devices for producing concrete blocks. It is thus possible for the storage container  7 , according to the teachings of the present invention, to be able to be used for retrofitting pre-existing devices for producing concrete blocks. For this purpose, the storage container  7 , according to the invention, can be attached as an attachment to the upper end of the previous storage container  7 , and then can be connected thereto. The solution according to the present invention thus allows pre-existing devices for producing concrete blocks to be retrofitted, or upgraded at comparatively low cost. 
     As may also be seen, in particular from  FIGS. 1 to 6 , one of the side walls  17  surrounding or forming, and further delimiting the receiving space  8 , is provided with a plurality of dispensing openings  18 . The dispensing opening  18  serves, in this case, to dispense a partial amount of the layers  9 ,  10 ,  11 ,  12  and  13 , the size of passage of the dispensing openings  18  being variable by the action of the dispensing means  19 . 
     The side wall  17  which is provided with the dispensing openings  18 , is inclined in relation to a vertical plane. The inclination is, in this case, variable by an adjusting device  20  which is illustrated, merely schematically, in  FIG. 2 , and which further may, for example, be a crank or an electric motor. In order to vary the inclination of the side wall  17 , a guide device  21  is also provided, and that allows the inclination of the side wall  17  to be increased, or reduced by actuating the adjusting device  20 . 
     As may be seen, in particular from  FIGS. 1 and 5 , the inclination allows, in the case of two layers  9 ,  10 ,  11 ,  12  and  13  positioned one on top of the other, in each case, the upper layer adjoining the side wall  17  forms an overhang protruding horizontally beyond the lower layer. 
     The dispensing opening  18  is arranged in the side wall  17  in such a way that the dispensing opening reaches each layer  9 ,  10 ,  11 ,  12  and  13 , irrespective of the inclination of the side wall  17 , and further allows concrete to fall out of each layer. 
     In the exemplary embodiment, a provision is made for the dispensing openings  18  to run vertically or perpendicularly in the side wall  17 , or to be made vertically, in the side wall  17 . In the exemplary embodiment, the dispensing openings  18  run in this case parallel to one another. 
     As may be seen in particular from  FIGS. 1, 2 and 4 , and further viewed in conjunction with one another, the side wall  17  is embodied in such a way so as to produce pockets  22  which are filled by the dispensing openings  18  with partial amounts of concrete from the layers  9 ,  10 ,  11 ,  12  and  13 . In these pockets  22 , gravity can cause the concrete  6  to fall downwardly in the direction of the dispensing device  15 , or the closure member  16 . 
     The pockets  22  are formed in a simple manner in that the side wall  17  has two walls  17   a , and  17   b , respectively. In this case, the wall  17   a  is the front of the side wall  17 , and is further oriented in the direction of the receiving space  8  which it adjoins. The wall  17   a  is provided with the dispensing openings  18 . The wall  17   b , which is preferably completely closed, and thus, as a closed back wall, prevents the concrete  6  falling in through the dispensing openings  18 , from escaping in an undesired direction, and is further located after the wall  17   a , i.e. at the side remote from the receiving space  8 . Stabilizing sheets  17   c  are arranged between the walls  17   a  and  17   b , respectively. The stabilizing sheets  17   c  can further extend over the entire height of the walls  17   a  and  17   b . However, and in an advantageous configuration, it is sufficient if the stabilizing sheets  17   c  extend only over a portion of the height, or if appropriate, a plurality of stabilizing sheets  17   c  are arranged, one over another, and next to one another. 
     The dispensing means  19  can further be embodied in any desired manner, and preferably as swords, drawing sheets, slides, hinges or the like. In the exemplary embodiment, a provision is made for the dispensing means  19  to be embodied as a connecting link  23  having passage openings  24 , and wherein the connecting link  23  is displaceable to the side wall  17 , and which defines the dispensing openings  18 . This is done in such a way that the size of passage of the outlet openings  18  results from the overlap thereof with the passage openings  24  of the connecting link  23 . 
     In this configuration, the solid webs or swords between the passage openings  24  of the connecting link  23  are the dispensing means  19  which, in a corresponding position of the connecting link  23 , completely close the dispensing openings  18 , or ensure by way of a corresponding displacement, that the dispensing openings  18  overlap with the passage openings  24  of the connecting link  23 . 
     In the exemplary embodiment, the connecting link  23  is arranged before the wall  17   a  of the side wall  17 , i.e. between the wall  17   a , and the receiving space  8 . The connecting link  23  extends, in this case, so as to be substantially plane-parallel to the wall  17   a . In principle, the connecting link  23  can also be arranged differently, for example, at the back of the wall  17   a , and as a result of which the pressure of the concrete contained in the receiving space  8  does not obstruct, or obstructs to a lesser extent, a displacement of the connecting link  23  which is plane-parallel to the wall  17   a . However, and in the exemplary embodiment, a provision is made for the connecting link  23  to be displaceably arranged at the front of the wall  17   a . A displacement of the connecting link  23  varies the overlap between the dispensing openings  18  in the wall  17   a , or the side wall  17 , and the passage openings  24 , in the connecting link  23 . 
       FIG. 3  is a plan view onto the side of the connecting link  23  that faces the receiving space  8 , and wherein the dispensing means  19 , i.e. the webs between the passage openings  24  of the connecting link  23 , are illustrated partly concealing the dispensing openings  18 . 
     The connecting link  23  can be moved in relation to the wall  17   a , and in any desired manner. In the exemplary embodiment, as illustrated, an electric motor  25 , which is illustrated in  FIG. 2 , is provided for this purpose. The sectional illustration according to  FIG. 4  additionally shows an actuating lever  26 , the extension  27 , of which is connected to the connecting link  23 , in such a way, that the extension is movable in a plane-parallel orientation relative to the wall  17   a.    
     As may also be seen from  FIG. 2  and  FIG. 3 , the dispensing means  19 , i.e. the webs of the connecting link  23 , are provided with pins  28 , mandrels or the like, and which are oriented toward the layers  9 ,  10 ,  11 ,  12  and  13 , in order to loosen up the layers  9 ,  10 ,  11 ,  12  and  13  in the region of the dispensing means  19 , so that the concrete  6  can fall through the dispensing openings  18  in a loosened-up form, and the generation of clumps are avoided.  FIGS. 2 and 3  show just one row of pins. It is, however, advantageous if at least one pin  28  is arranged on each layer  9 ,  10 ,  11 ,  12  and  13  and for each dispensing opening  18 . 
       FIGS. 7 a  and 7 b    show two alternatives for configuring the dispensing means  19 . According to  FIGS. 7 a  and 7 b   , the dispensing means are embodied as rotatable shafts  19 ′ which vary the size of passage of the dispensing openings  18  as a function of rotation.  FIGS. 7 a  and 7 b    further show in this case, merely a detail of the side wall  17  or the wall  17   a  with a dispensing opening  18  in which the rotatable shafts  19 ′ are arranged. The shafts  19 ′ have, in this case, means  29  for conveying partial amounts of the layers through the dispensing opening  18 . In the exemplary embodiment, the means are embodied, in this case, as thickenings  29 . However, the means could also be varies, circumferential enlargements, projections, blades, pins and the like. The thickenings  29  are intended to allow or facilitate, in addition to the independent falling-out of concrete  6  through the dispensing opening  18 , active movement of the concrete  6  out of the receiving space  8 , for example, such as is the case during pumping. 
       FIG. 7 b    additionally shows an arrangement of two respective shafts  19 ′ for each dispensing opening  18  which cooperate together in mutual engagement. In this case,  FIG. 8 a    shows a position, such as it is illustrated in  FIG. 7 b   , and in which the shafts  19 ′ engage or cooperate with each other in such a way that the thickenings  29  completely, or almost completely, close the dispensing opening  18 .  FIG. 8 b    additionally shows an arrangement of the shafts  19 ′ that is rotated through 90 degrees, as a result of which the dispensing opening  18  has its maximum size of passage. 
     The shafts  19 ′ can further, for example, be formed from plastic material, rubber or metal. 
     In a manner not illustrated in greater detail, a provision may be made for the side wall  17 , which is provided with the dispensing openings  18 , and/or an opposing side wall  30 , to be movable in order to increase or reduce the distance between the side walls  17  and  30 . 
     Furthermore, means  31 , for example in the form of guide sheets, can be provided, as is illustrated by way of principle in  FIG. 1 , in order to fill the receiving space  8  with layers  9 ,  10 ,  11 ,  12  and  13  of the different-colored concrete, the layers being formed as uniformly as possible. In the exemplary embodiment, the guide sheets  31  are arranged above the receiving space. 
     The receiving space  8  can have any desired configuration. For example, provision may be made for the size of the receiving space  8  to increase in a substantially funnel-shaped manner toward the top. The receiving space  8  can, for example, have a size of from 1 to 4 m3, preferably 1 to 3 M 3 . 
     As may also be seen from  FIG. 2 , as well as  FIGS. 5 and 6 , the floor  14  of the receiving space  8  is embodied as a slide or drawing sheet. In the exemplary embodiment, the slide  14  is mounted so as to be transversely displaceable, so that an opening slot  32  is formed or defined between the slide  14 , and the outer walls  17 ,  30  of the receiving space as a result of a longitudinal movement of the slide  14 . Gravity can cause or facilitate the partial portions of the layers  9 ,  10 ,  11 ,  12  and  13  to fall downwardly through this opening slot  32 .  FIG. 5  is an illustration in which the slide  14  is closed, i.e. the floor in the receiving space  8  is closed.  FIG. 6  is an illustration in which the opening slot  32  already takes up one third of the original floor, so that the partial portions or columns of the layers  9 ,  10 ,  11 ,  12  and  13  can collapse and blend in the process. 
     The slide  14  can open and close in any desired and known manner. In this regard, and with respect to the general construction and the function of the slide  14 , reference is made to the prior art, and in particular EP 1 017 554 B1. If appropriate, an impact body, a prism or a guide sheet according to the teachings of EP 1 017 554 B1 can also be provided in the falling path of the concrete from the slide  14  and/or the dispensing openings  18 . 
     Conventionally, the slide is embodied as a flat or planar plate, which is made preferably of metal.  FIG. 2  shows a possibility for displacing the slide  14 . A carrier frame  33 , which carries the storage container  7 , is in this case provided. The carrier frame  33  is extended sufficiently far in a horizontal plane so that the slide  14  can be displaced via an electric motor  34 , and in such a way that the opening slot  32  opens and closes. 
     In the exemplary embodiment, the slide  14  does not extend to under the pockets  22 ; in principle, the pockets are therefore open. However, in an alternative configuration, the pockets can also be closed by the slide  14 , or by means of a separate element. 
       FIG. 9  is a plan view which is taken from above, and onto the slide  14  in a specific configuration. The slide  14  has, in this case, a triangular incision which is closed, when the slide  14  is closed, by a prismatic or conical projection  35  which also extends upward. As a result of the conical projection  35 , more material slips down, during opening of the slide  14 , from upper layers  10 ,  11 ,  12  and  13  (on account of the rising slope of the conical projection  35 ) than would be the case in a conventional slide  14 . This can be advantageous for certain applications. 
     Even independently of the solution according to the invention, a use of a slide according to  FIG. 9  is expedient for certain applications, including for example in the device according to the teachings of EP 1 017 554 B1. 
       FIG. 10  shows a further configuration of the solution according to the invention, and in this case, a provision is made for the side wall  17 , and which is provided with the dispensing openings  18  to be embodied as an inner wall in the receiving space  8 . The side wall  17  is, in this case, conically configured, and further tapers from the floor  14  of the receiving space  8 , and toward the top. Provided, again, this is a type of connecting link  23  having web-like dispensing means  19  and passage openings  24 . In this configuration, the connecting link element  23  is adapted to the side wall  17 , and therefore is also configured in a conical or substantially conical manner. A rotation of the connecting link  23  to the side wall  17  or to the dispensing openings  18  thereof alters the overlap of the dispensing openings  18  with the passage openings  24 , so that the size of passage of the dispensing openings  18  can be varied, and if appropriate, completely opened or completely closed. 
     The floor or the slide  14  can open in a known manner, and wherein the conical inner or side wall  17  can be linked, as shown in  FIG. 10 , to the outer side walls of the receiving space  8 , for example via a carrier mount. 
     A further advantageous detail, and in particular for the embodiments illustrated in  FIGS. 1 to 8 , is an extension sheet  36  which may be seen, for example, in  FIGS. 2, 5 and 6 . In order to be able to easily incline or pivot the side wall  17 , a bearing  37  is provided about which the wall  17   b  of the side wall  17  is rotatable or pivotable in order to incline the side wall  17 . As the hinge pin  37  is associated with the wall  17   b  in the exemplary embodiment, the distance between the underside of the wall  17   a , and the slide  14  varies during rotation or pivoting about the hinge pin  37 , so that there may be a risk of concrete  6  escaping through the gap which is formed. For this purpose, the extension sheet  36  is provided, which can be extended or retracted as required via an operating element  38  (illustrated in  FIG. 2 ) at the underside of the wall  17   b  in order to compensate for a gap which is formed as a result of the pivoting. 
     Alternatively, the hinge pin  37  can also be associated with the wall  17   a.    
     The basic principle of the methodology of the present invention should be apparent from a study of  FIGS. 1, 2, 5 and 6  and when they are further viewed in conjunction with one another. In order to apply a facing layer of colored concrete for forming an upper side of a paving stone, provision is in this case made for the colored concrete to be introduced into the mold  4  from the storage container  7 . The facing layer is, in this case, formed by the various previously dyed layers  9 ,  10 ,  11 ,  12  and  13 . The layers are, in this case, stored and layered, one over another, in the storage container  7 , and can further be introduced therein by any desired manner, but preferably by using the guide sheet  31  as earlier disclosed. As may be seen from  FIG. 5 , at least a first partial amount of the layers  9 ,  10 ,  11 ,  12  and  13  is dispensed from the storage container  7  as a result of the fact that the dispensing openings  18  in the side wall  17  are opened. Thus, a first partial amount of the layers  9 ,  10 ,  11 ,  12  and  13  falls onto the closure member  16  of the dispensing unit  15  in a thoroughly blended form. Once a first partial amount has been supplied to the closure member  16 , in a thoroughly blended form, the process can be repeated by way of a cyclical opening, and closing of the dispensing openings  18 , by the dispensing means  19 . As soon as this desired or sufficient material no longer adjoins the side wall  17  provided with the dispensing openings  18 , the slide  14  can be opened, such as is illustrated in  FIG. 6 , and preferably continuously, or step by step, so that partial portions of the layers  9 ,  10 ,  11 ,  12  and  13  break off and fall downward. 
     It is in keeping with the basic idea of the invention that any desired block bodies made of concrete materials, for example, apart from paving stones and building blocks, also plates, split blocks, veneer blocks or the like, can be provided with a colored, and in particular marbled concrete material facing layer or facing layer displaying a color mix in accordance with the method and using the device. 
     The solution according to the present invention also allows concrete blocks displaying a visual strip effect to be produced by way of a suitable control of the slide  14  and/or the dispensing openings. 
     It is also possible to use the method and the device in the case of any type and shape of block bodies formed entirely from colored concrete materials. Furthermore, a provision may also be made to dispense not only a partial amount, but the entire contents of the receiving space  8  through the dispensing openings  18 . 
     In a particularly simple configuration, the dispensing means  18  for opening and closing may also be relinquished or the dispensing means  19  can keep the size of passage of the dispensing openings constant. This also improves blending over the prior art. However, the result is not as advantageous as when the dispensing means ensure opening and closing of the dispensing openings. However, the invention is also intended to include this variant.