Construction site mixing machine, in particular mobile construction site rotary mixing machine

Abstract

The invention relates to a construction site mixing machine for mixing mixed materials, in particular for mixing plasters, screeds, concrete, mortar, slurries or resins, comprising a mixing container (2) for a mixed material, with a mixing tool displacement device (15) by means of which at least one mixing tool (16) which can be actuated by means of a mixing tool drive device (19) can be displaced between at least one mixing tool use position and a mixing tool non-use position.According to the invention, it is provided that the mixing tool displacement device has or is formed by a telescopic device (15), preferably arranged laterally next to the mixing container (2) and / or projecting upwards in the vertical axis direction, wherein the at least one mixing tool (16), preferably together with the mixing tool drive device (19), can be displaced by means of the telescopic device (15) in the telescopic axis direction between the at least one mixing tool use position and the mixing tool non-use position.

Description

[0001] The invention relates to a construction site mixing machine, in particular a mobile construction site rotary mixing machine, for mixing mixed materials, in particular for mixing plasters, screeds, concrete, mortar, slurries or resins.

[0002] Site mixers, especially mobile site mixers such as rotary mixers, play a key role on construction sites, enabling the efficient and precise on-site mixing of a wide range of materials, including plasters, screeds, concrete, mortar, slurries, and resins. Their typically rotating mechanism enables homogeneous mixing of a wide variety of construction materials, resulting in improved end product quality.

[0003] Construction site mixers, especially mobile construction site mixers, enable the efficient production of mixes and are therefore effective high-performance machines for harsh construction operations. To meet the increasing and changing demands of the construction industry, there is a need to improve existing construction site mixers, especially in the areas of automation, material feeding, user-friendliness, and safety.

[0004] It is therefore an object of the present invention to provide a construction site mixing machine, in particular a mobile construction site rotary mixing machine, for mixing mixed materials, in particular for mixing plasters, screeds, concrete, mortar, slurries or resins, which meets the growing needs of the construction industry and is improved in particular with regard to user-friendliness and operational reliability.

[0005] This problem is solved by the features of the independent patent claims. Advantageous embodiments are the subject of the dependent claims.

[0006] According to the invention, a construction site mixing machine, in particular a mobile construction site rotary mixing machine, is provided for mixing mixed materials, in particular for mixing plasters, screeds, concrete, mortar, slurries or resins, which has a mixing container which is open at the top and is suitable and designed to receive a mixed material in its receiving space.Furthermore, the construction site mixing machine comprises a mixing tool displacement device, by means of which at least one mixing tool, which can be actuated by means of a mixing tool drive device and is preferably driven in rotation, can be displaced between a preferably operational mixing tool use position, in which the at least one mixing tool is received, preferably ready for operation, in the receiving space, and a mixing tool non-use position, in which the at least one mixing tool is not in any mixing tool use position, in particular not in any operational mixing tool use position.According to the invention, it is provided that the mixing tool displacement device has or is formed by a telescopic device, preferably arranged laterally next to the mixing container and / or projecting upwards in the vertical axis direction, wherein the at least one mixing tool, preferably together with the mixing tool drive device, can be displaced by means of the telescopic device in the telescopic axis direction between the at least one mixing tool use position and the mixing tool non-use position.

[0007] Such a telescoping device offers significant advantages in terms of adaptability, space savings, and efficiency, particularly compared to up-and-down pivoting displacement devices. A telescoping device enables particularly simple and variable adjustment of the respective mixing tool position along the telescopic axis. Furthermore, such telescoping devices can be arranged in the area of ​​the mixing container holder with less space requirement. Furthermore, such telescoping devices are particularly easy and uncomplicated to handle and operate. Furthermore, such telescoping devices are characterized by greater mechanical stability and thus greater reliability. With a telescoping device aligned along the vertical axis, the direction of the telescoping axis corresponds to the vertical axis.

[0008] According to a preferred specific embodiment, the telescoping device has at least two telescoping elements that are telescopic relative to one another in the direction of the telescoping axis, based on the telescoping device. Particularly preferred in this context is a specific embodiment in which the telescoping device has a lower telescoping element in the direction of the telescoping axis, to which at least one upper telescoping element is connected, displaceable relative thereto, upwards in the direction of the telescoping axis, and on which the mixing tool drive device, preferably together with the at least one mixing tool connected or connectable thereto, can be arranged or is arranged.It is particularly advantageous if the at least one mixing tool, in particular the free lower end of the at least one mixing tool, is located in a predetermined raised position, preferably in the area above the upper edge of the mixing container, in the extended position of the telescoping device, and in the ready-to-use mixing tool position in the retracted position of the telescoping device. It should be expressly mentioned here that the terms "top" and "bottom" in connection with a telescoping element always refer only to the relative position of two telescoping elements to each other and do not automatically mean that this must be a "lowest" or "top" telescoping element, let alone only two telescoping elements in total, although the latter is a particularly preferred, compact design.In short, when the terms 'top' and 'bottom' are used in the context of the present invention in connection with a telescoping element, they generally only describe the relative positioning of two telescoping elements to each other. They do not necessarily imply that one element is the 'top' or 'bottom', nor do they necessarily mean that the two telescoping elements must be directly adjacent to each other. One or more elements forming part of the telescoping device, in particular one or more telescoping elements, can also be arranged between the telescoping elements under consideration and / or below and / or above the telescoping elements under consideration.

[0009] According to a further alternative according to the invention, which is claimed both together with and independently of the displacement device designed as a telescoping device, an upwardly open mixing container is provided, which is suitable and designed to receive a mixing material in its receiving space. Furthermore, a mixing tool displacement device, for example a telescoping device as a mixing tool displacement device, is provided, by means of which at least one mixing tool, which can be actuated by means of a mixing tool drive device and is preferably rotatably driven, can be displaced between at least one operational mixing tool use position, in which the at least one mixing tool is received in the receiving space in a ready-to-use position, and a mixing tool non-use position, in which the at least one mixing tool is not in an operational mixing tool use position.Furthermore, a control device is provided which electronically controls the activation and deactivation of the mixing tool drive device, and an actuating device is provided by means of which the control device can be activated and, if necessary, deactivated. The actuating device is preferably formed by a main switch acting as an on / off switch. Furthermore, it is provided that the control device has a safety function and / or safety device which, i.e., safety function and / or safety device, is suitable and designed to enable operation of the mixing tool drive device when the actuating device is activated if the at least one mixing tool is in the operational mixing tool use position, or to block it if the at least one mixing tool is not in the operational mixing tool use position.A construction site mixer according to the invention equipped in this way offers a multitude of advantages that make it an efficient and safe solution for mixing various mixes: The electronically controlled mixing tool drive unit ensures reliable and precise operation of at least one mixing tool. Furthermore, the integrated safety function and / or safety device ensures safe operation of the mixing tool drive unit. It detects the correct position of the mixing tool and allows operation only in the ready-to-use position, which reduces or prevents potentially hazardous situations. The safety function and / or safety device can be implemented using a wide variety of technical measures.For example, the control device can be equipped with position sensors as a safety device that detect whether the mixing tool is in the ready-to-operate position or not. Alternatively or additionally, a safety switch could also be provided as a safety device, whereby the safety switch is activated when the mixing tool is moved into the ready-to-operate position. This safety switch can be connected to the control device and enable operation when the correct position is reached. Finally, the safety function can alternatively or additionally be implemented in a programmable logic controller that considers various conditions and logic to safely enable or disable operation.These exemplary measures, which can be applied individually or in combination, show that there are a wide variety of measures, i.e. in the broader sense mechanical and / or electronic interlocks, that can be used to physically and / or software-based ensure that operation is only released when the safety conditions are met.

[0010] Particularly in the case where the construction site mixer according to the invention is designed as a mobile construction site mixer, for example, a mobile construction site rotary mixer, flexible use on construction sites of various types is ensured, since the construction site mixer can be placed on-site regardless of the size or type of construction project, thus eliminating the need for external mixing stations. This helps reduce time and transport costs.

[0011] In summary, the construction site mixer according to the invention not only offers high performance and versatility when mixing different materials, but also ensures that the mixing process is reliably and precisely controlled to guarantee high-quality results on the construction site.

[0012] According to a particularly preferred specific embodiment, a mixing container holder is provided which holds the mixing container. This allows the mixing container to be positioned precisely and thus also ensures that the mixing container is in the correct desired position for the mixing task. For this purpose, the mixing container holder preferably has a, preferably flat or level, storage surface on which the mixing container can be placed for its reception in the mixing container holder. The storage surface, in particular a flat or level storage surface, of the mixing container holder enables simple and precise positioning of the mixing container. Construction workers can easily place the mixing container on the storage surface, which leads to simplified handling and rapid readiness of the mixing machine. In particular, the flat or level storage surface also ensures a stable base for the mixing container during the mixing process.This contributes to uniform rotation and mixing of the materials by avoiding irregularities in the position of the mixing container.

[0013] According to another particularly preferred embodiment, it can also be provided, alternatively or additionally, that the mixing container receptacle has a holding device that is suitable and designed to releasably hold the mixing container, preferably the mixing container placed on the storage surface, on or in the mixing container receptacle, preferably releasably and force-fittingly and / or positively on or in the mixing container receptacle. In this context, the holding device can be formed, for example, by a clamping device that releasably clamps the mixing container, preferably a lower container region of the mixing container relative to the vertical axis direction, by means of at least one clamping element.For example, the clamping device can be formed by a clamping ring or by several clamping elements, for example, protruding from the mixing container receptacle in a bracket-like manner, which are arranged, for example, spaced apart from one another around the storage surface and clamp a lower edge region of the mixing container between them. Alternatively or in addition to such a force- orfrictional holding device, however, according to a particularly preferred embodiment, which is expressly also claimed separately and independently of the embodiment of the mixing tool displacement device as a telescopic device, a positive-locking holding device can be provided, for example in such a way that at least one driver element is arranged on the mixing container receptacle, preferably in the region of the storage surface of the mixing container receptacle, which driver element in the use position of the mixing container, that is to say with a mixing container positioned in or on the mixing container receptacle, cooperates with at least one driver counter-element formed on the mixing container, preferably on an underside of the mixing container, for example in the form of a driver tab, which can for example be injection-molded there.Particularly preferred here is a specific embodiment in which a plurality of driver elements spaced apart from one another in the circumferential direction and / or a plurality of driver counter-elements spaced apart from one another in the circumferential direction are provided, thereby ensuring that the driver function acts quickly and reliably even if the direction of rotation of the mixing container drive device is reversed. This ensures in a simple and reliable manner that the mixing container can no longer slip during operation. Such a holding device, in particular a force-fitting and / or friction-fitting one, offers secure hold for the mixing container. This ensures stable positioning during the mixing process and minimizes possible vibrations and displacement of the mixing container. The holding device thus facilitates the secure attachment and removal of the mixing container from the mixing container holder.Construction workers can perform loading and unloading quickly and efficiently, increasing overall productivity.

[0014] According to a further particularly preferred embodiment of the construction site mixing machines according to the invention, the mixing container holder comprises a rotatably mounted receiving element, preferably a rotating platform or turntable with a storage area for the mixing container, which receives the mixing container and is rotatably coupled to a mixing container drive device, so that the mixing container can be rotated together with the receiving element during the mixing process. A rotatably mounted receiving element ensures uniform rotation of the mixing container during the mixing process, which leads to homogeneous mixing of the materials and contributes significantly to improving the quality of the end product. Uniform mixing of the materials is achieved, in particular, when the mixing container and mixing tool rotate together.The continuous movement helps ensure that all components of the mix are effectively blended together, resulting in a more homogeneous product quality. The simultaneous rotation during mixing also enables more efficient mixing in a shorter time, as the mix is ​​moved not only by the mixing tool but also by the rotating mixing vessel. Furthermore, when mixing many different materials, the simultaneous rotation also helps reduce the adhesion of materials to the mixing tool and the vessel walls. Furthermore, the rotation of the mixing vessel allows for more flexible adaptation of the operating mode to different mixes. For example, depending on the properties of the materials to be mixed, the relative rotation between the mixing vessel and the mixing tool can be varied to create the desired optimal mixing conditions.

[0015] The latter is achieved in particular with a preferred embodiment in which the control device, in an advantageous dual function, also electronically controls the activation and deactivation of the mixing container drive device. According to a particularly preferred embodiment in this regard, it can also be provided that the safety function and / or safety device is suitable and designed to enable the operation of the mixing container drive device when the actuating device is activated, if the at least one mixing tool is in the operational mixing tool use position, or to block it if the at least one mixing tool is not in the operational mixing tool use position.Similar to the safety measure for the mixing tool drive device, the safety function and / or safety device is enhanced here to ensure that the mixing container drive device can only be activated when the mixing tool is in the ready-to-use position. This prevents potential accidents and damage that can occur if the mixing container is rotated while the mixing tool is not properly positioned. Operators can therefore be assured that the entire mixing process will only start when all components are correctly aligned and secured, minimizing the risk of accidents. This ensures compliance with the highest safety standards and regulations regarding machine operation and occupational safety.Here again, the safety function and / or safety device can be implemented through the technical measures described above to ensure that operation only occurs under safe conditions. These measures can, as previously described, be mechanical and / or electronic in nature and may include, for example, position sensors, safety switches, and / or programmable logic controllers. These measures, individually or in combination, can thus, in a broader sense, create physical and / or software-based interlocks that ensure that the desired safety conditions are met before operation is permitted.

[0016] Furthermore, it can preferably be provided that the control device is coupled to a time selection device, preferably a time selection switch, by means of which the operating time of the mixing tool drive device and / or the mixing container drive device can be specified. Such a control device enables precise electronic control of the drive devices. This leads to a precisely controllable mixing process. The coupling to a time selection device also allows the operating time of the drive devices to be programmed. This function thus enables a time-efficient and automated operation, which is particularly useful when certain materials may only be mixed for a defined period of time.

[0017] According to a particularly preferred specific embodiment, it is also provided that the control device is suitable and designed to activate and, if necessary, deactivate the mixing tool drive device and the mixing container drive device simultaneously or with a time delay. An embodiment is particularly preferred in this case in which the control device is suitable and designed to activate the mixing tool drive device before the mixing container drive device, so that the at least one mixing tool can be driven before the mixing container. This ensures an advantageous, smooth start to the mixing process without significant "turbulence" in the mix. Even if the at least temporarily simultaneous operation of the mixing container drive device and the mixing tool drive device is preferred, it is of course also possible to provide or implement operating modes.to program in which only the mixing container drive unit or only the mixing tool drive unit is operated via the control unit. This allows precise adaptation to specific mixing requirements. For example, the mixing container can be rotated separately for certain mixing materials while the mixing tool remains stationary, which can be advantageous for sand or gravel mixtures, for example. On the other hand, it is of course also possible to operate only the mixing tool and not the mixing container, if desired.

[0018] According to a further particularly preferred embodiment, the mixing container drive device is formed by a drive motor, preferably an electric motor, which drives a rotational axis that is connected, preferably centrally and centrically, to the underside of the rotatably mounted receiving element, preferably formed by a rotation platform or turntable. A drive motor, in particular an electric motor, can be controlled efficiently and precisely, wherein the central connection in particular ensures efficient transmission of the drive power of the drive motor to the receiving element. The central and centric arrangement of the rotational axis also contributes significantly to the mixing container rotating evenly and stably, which is important for ensuring efficient and homogeneous material mixing. Furthermore, this reduces vibrations during operation.

[0019] According to a further particularly preferred embodiment, it is provided that the mixing container receptacle has or forms a housing and / or frame part of the construction site mixer that is arranged on the bottom with respect to the vertical axis, wherein it is preferably provided that the housing and / or frame part has an elongated shape and / or is box-shaped and / or cuboid-shaped and / or movable. Such a housing and / or frame part arranged on the bottom enables not only good accessibility but above all the possibility of arranging or accommodating components of the construction site mixer there. This is achieved in particular with an elongated shape or with a box-shaped and / or cuboid-shaped structure. The movable nature also ensures easy maneuverability of the construction site mixer on a construction site.

[0020] According to a further particularly preferred embodiment, it is provided that the mixing container receptacle having an elongated shape and / or box-like and / or cuboid-like design preferably has a length of between 0.4 m and 1.0 m and / or that the mixing container receptacle is designed on both longitudinally opposite sides with an engagement area for manual transport of the construction site mixer, preferably with the mixing container removed.

[0021] Furthermore, according to a particularly preferred embodiment of the present inventive concept, it is also particularly advantageous if the drive motor is accommodated in the housing and / or frame part, with the rotational axis passing through the housing and / or frame part and being connected there directly or indirectly to a drive shaft of the drive motor. The integration of the drive motor into the housing and / or frame part contributes to protecting the motor from external influences such as dirt, water, or other environmental factors that are common on construction sites.

[0022] For a particularly compact design, it is also advantageous for the telescoping device, preferably a lower or the lower telescoping element of the telescoping device, to be directly or indirectly connected to the mixing container receptacle comprising a housing and / or frame part, preferably to a projection of the mixing container receptacle comprising a housing and / or frame part projecting beyond the rotatably mounted receptacle element, and to protrude upwards therefrom in the vertical axis direction. The telescoping device can protrude upwards in a straight line or, if appropriate, also protrude upwards in the vertical axis direction at an angle to the vertical, preferably inclined by 1° to 10°, preferably by 3° to 6°, relative to the vertical axis direction.With such an inclination, the position of the mixing tool, for example, the position of a mixing basket of a mixing blade, can be advantageously adapted to the geometry of the receiving space of the mixing container, in particular to a receiving space that tapers conically downwards, for example, such that the mixing tool maintains a constant distance from the container wall throughout. This allows for consistent mixing results to be achieved.

[0023] According to another particularly preferred embodiment, a positive guide device is provided which is suitable and designed to prevent rotation of the upper telescopic element relative to the lower telescopic element during lowering of the upper telescopic element, preferably depending on a defined lowering path of the upper telescopic element, and to enable a positively guided linear transfer of the at least one mixing tool into the mixing tool use position. This enables secure positioning and / or alignment of the upper telescopic element and thus of the at least one mixing tool arranged on it in the mixing tool use position.In this context, it is advantageous for a structurally simple embodiment which is also easy to manufacture if the positive guidance device has at least one centering blade arranged on the upper telescoping element, preferably at least one centering blade protruding from a lower end region of the upper telescoping element facing the mixing container receptacle, which is suitable and designed to engage in a centering receptacle on the mixing container receptacle in a shape and / or contour-adapted manner when the upper telescoping element is lowered, preferably as a function of a defined lowering path of the upper telescoping element, and to transfer the upper telescoping element non-rotatably and positively guided into the mixing tool use position.

[0024] A particularly advantageous design of the telescoping device results from a configuration in which the telescoping device has at least one, preferably elastic, prestressing element, by means of which the telescoping device can be prestressed into the extended position and against whose prestressing force the telescoping device can be displaced into a retracted position. Such a prestressing element ensures efficient displacement of the telescoping device into the desired position, here into the extended position in which the at least one mixing tool is in the non-use position. Such a preferably elastic prestressing element thus helps to improve the functionality and user-friendliness and thus also the efficiency of the telescoping device of the construction site mixer.Particularly advantageously, the at least one elastic pre-tensioning element is formed by a gas pressure spring, which are low-maintenance elastic pre-tensioning elements that have a long service life and can also be over-pressurized without great effort when the at least one mixing tool is to be transferred by the operator into the desired operational mixing tool use position.

[0025] According to another particularly preferred embodiment, the upper telescopic element, in the extended position of the telescopic device, is rotatable or pivotable relative to the lower telescopic element and in a horizontal plane about the longitudinal axis of the telescopic device. As a result, in the extended position of the telescopic device, the at least one mixing tool can be reliably and conveniently pivoted by means of the upper telescopic element in a horizontal plane located above the upper edge of the mixing container into a mixing tool insertion position, in which the at least one mixing tool is located directly above the mouth opening of the mixing container and is prepared for transfer into the ready-to-use mixing tool position.In addition to a compact design, this advantageously means that the entire mixing tool can be pivoted completely away from the area above the mixing container, which simplifies filling the mixing container as well as its removal or loading. Accordingly, according to a particularly preferred embodiment, it is also provided that the at least one mixing tool, in the extended position of the telescoping device, can be pivoted by means of the upper telescoping element in the horizontal plane lying above the upper edge of the mixing container from the mixing tool insertion position into a filling position such that the at least one mixing tool is arranged laterally outside the mixing container and / or exposes the mouth opening of the mixing container for filling.

[0026] According to a particularly preferred specific embodiment, a pivot angle limiting device, preferably at least one stop element as pivot angle limiting device, is further provided, by means of which the pivot angle of the upper telescopic element relative to the lower telescopic element and thus the two maximum pivot positions are limited.This contributes significantly to increasing the overall functional reliability, wherein it is preferably provided that a first maximum pivoting position essentially corresponds to the mixing tool insertion position and in which the at least one mixing tool is located directly above the mouth opening of the mixing container, while a second maximum pivoting position is a pivoting position in which the at least one mixing tool is arranged laterally outside the mixing container and / or is pivoted outwards by at least 60°, preferably approximately by 95° or even further, i.e. by at least 60°, away from the mixing tool insertion position.

[0027] According to another particularly preferred embodiment, a locking device is provided that is suitable and designed to releasably lock the upper telescopic element, pivoted from the mixing tool insertion position toward the filling position, from pivoting back depending on a predetermined pivoting path. This reliably prevents unwanted pivoting back of the upper telescopic element and thus ensures reliable filling of the mixing container. Furthermore, the locking device ensures that a suction device arranged on the upper telescopic element, which will be described in more detail below, is reliably held in the desired suction position.The releasable locking is achieved in a functionally and technically simple manner, particularly with an embodiment in which the locking device is designed as a releasable latching and / or snap-in connection, and in which a latching element preloaded in the direction of latching engagement by a preloading element snaps behind a latching counter-element after a predetermined pivoting path and latches there. In this context, it can also be further provided that the latching element is coupled to an actuating element, preferably to a manually operable button, by means of which the latching element can be brought out of latching engagement with the latching counter-element for unlocking against the force of the preloading element.Alternatively or additionally, it can also be provided that the locking element can be disengaged from the locking counter-element by moving the upper telescopic element upwards or downwards in the direction of the telescopic axis, so that pivoting of the upper telescopic element, preferably toward the mixing tool insertion position, is permitted in this height position of the upper telescopic element. This increases the variability and flexibility of the design.

[0028] According to another particularly preferred embodiment, a suction device is arranged on the upper telescopic element, preferably in a lower region of the upper telescopic element relative to the vertical axis, by means of which suction material accumulating in the region of the mixing container's mouth opening can be suctioned away. Contamination can be advantageously avoided or minimized by means of such a suction device.In this case, for a simple embodiment, it is preferably provided that the suction device is open on both sides and / or has a suction pipe formed by a straight pipe section, the first suction pipe opening of which is located in the extended position of the telescopic device in the area above the upper edge of the mixing container, preferably directly above the upper edge of the mixing container, and / or which is aligned in a suction position in the direction of the mouth opening of the mixing container, and the second suction pipe opening of which is or can be coupled, preferably detachably, to a suction device.

[0029] For example, in conjunction with a pivot angle limiting device described above and / or a locking device, but not only therewith, according to a further particularly advantageous embodiment that supports functionally reliable operation of the construction site mixer, it can be provided that the first suction pipe opening of the suction pipe is oriented in the filling position, in particular in the second maximum pivot position, in the direction of the mouth opening of the mixing container and / or that the first suction pipe opening is chamfered, preferably with a chamfer angle of 15° to 45°. This not only increases the suction surface, but also prevents the mixing container from getting caught on the suction pipe when being removed.

[0030] For efficient and reliable operation of the telescoping device, it is advantageous according to a further particularly preferred embodiment that the telescoping device has a positive guide device that releases the lowering of the upper telescoping element only in the mixing tool insertion position, in which the at least one mixing tool is located directly above the mouth opening of the mixing container. Such a positive guide device thus helps to prevent incorrect operation in a functionally reliable manner. The positive guide device can, for example, have a first positive guide element arranged or formed on the lower telescoping element, for example a guide slot, which interacts with a second positive guide element arranged and formed on the upper telescoping element, for example a sliding block that is positively guided in the guide slot.Of course, a kinematic reversal is also possible here, in which the first positive guide element is formed by the sliding block, while the second positive guide element then forms the guide block in the opposite way.

[0031] In order to enable reliable operation of the telescoping device, particularly in rough construction site conditions, in which the telescoping device is safely and reliably protected from contamination, it is advantageous according to a particularly preferred embodiment if the lower telescoping element is accommodated in the upper telescoping element in the collapsed state.

[0032] According to another particularly preferred embodiment, a (optionally further) locking device, in particular a spring-loaded locking mechanism, is provided, by means of which the telescoping device is releasably locked in the preferably operational mixing tool use position of the at least one mixing tool, preferably in such a way that the locking device is releasably locked only when the at least one mixing tool is in the preferably operational mixing tool use position. Such a locking device thus represents, in a preferred embodiment, an essential component of the safety function or safety device, since it ensures, on the one hand, that the at least one mixing tool is securely held in the operational mixing tool use position.Furthermore, this also ensures that the desired operational mixing tool use position is only reached when the locking device has releasably locked the mixing tool displacement device. This allows for simple monitoring of the operational mixing tool use position of at least one mixing tool, particularly in conjunction with the specific design of the safety function or safety device explained in more detail below.

[0033] The locking device can, in principle, be designed in different ways, but preferably comprises a locking element formed on the upper telescoping element, which, in the locking position, interacts with a locking counter-element in the region of the lower telescoping element and / or in the region of the mixing container receptacle. For example, the locking device is formed by a stable and easily manufactured spring-loaded locking mechanism, which has a locking element formed on an upper telescoping element, which interacts with a spring-loaded locking counter-element in the region of the lower telescoping element and / or in the region of the mixing container receptacle, which can be overridden to establish the locking connection.Of course, a corresponding kinematic reversal is also possible here, in which the spring-loaded locking mechanism has a locking element formed in the area of ​​the lower telescopic element and / or in the area of ​​the mixing container holder, which interacts with a spring-loaded locking counter-element on the upper telescopic element that can be overridden to establish the locking connection.

[0034] Furthermore, it is advantageous if the locking device cooperates with an unlocking device by means of which the locking of the telescoping device can be released, in particular actively released. This is achieved, for example, by the unlocking device being formed by an unlocking element mounted on the telescoping device, preferably by a lever, upon actuation of which the locking counter-element can be disengaged from the locking element, preferably against the action of a spring force.

[0035] According to another particularly preferred embodiment, it can also be provided that the telescoping device, preferably an upper or the upper telescoping element of the telescoping device, can be displaced in the unlocked state, preferably essentially automatically, in the direction of the extended position by means of the elastic pretensioning element, preferably a gas pressure spring. This ensures in a simple manner that the telescoping device moves back into the desired position, namely into the extended position in which the at least one mixing tool can be displaced easily and reliably away from the mixing container by means of the upper telescoping element, which can be pivoted horizontally about the lower telescoping element.

[0036] According to a particularly advantageous embodiment, which contributes significantly to increasing the operational safety of the construction site mixing machine as a whole, it is provided that the above-described safety function and / or safety device is formed by a monitoring device, preferably a monitoring device forming part of the mixing tool displacement device, or that the above-described safety function and / or safety device has a monitoring device, preferably a monitoring device forming part of the mixing tool displacement device.This monitoring device is coupled to the control device in a signal-transmitting manner and is also suitable and designed to detect at least the operational mixing tool use position of the at least one mixing tool, for example by sensor means and / or by means of at least one switch, and to enable the operation of the mixing tool drive device and / or the mixing container drive device - when the actuating device is activated - only when the at least one mixing tool is in the operational mixing tool use position.A "monitoring device" within the meaning of the present invention refers to all conceivable sensors or switches that, in conjunction with a safety function and / or a safety device, are suitable for monitoring the position or state of a moving component in a system and triggering corresponding signals or actions when a specific position is reached. The term "monitoring device" within the meaning of the present inventive concept thus encompasses, on the one hand, all types of switches, including limit switches, placed at the end of a movement path. On the other hand, it also encompasses all types of sensors, such as light barriers, magnetic field sensors, or optical sensors, that are used to detect the position of objects or components.

[0037] According to a particularly preferred specific embodiment of the present inventive concept, the monitoring device is a component of the telescoping device. With such a telescoping device, the respective position of the at least one mixing tool can be monitored particularly easily depending on the position of the telescoping elements that can be displaced relative to one another.

[0038] Furthermore, a specific embodiment is advantageous in which the monitoring device has a safety sensor and / or a safety switch, preferably a position switch, which is coupled to the control device in a signal-transmitting manner. According to a specific embodiment, it can be provided that the safety switch is deactivated in the operational mixing tool use position of the at least one mixing tool and thus when the telescoping device is retracted, so that operation of the mixing tool drive device and / or the mixing container drive device is enabled. The control device can then, with the actuating device simultaneously activated, control or activate the mixing tool drive device and / or the mixing container drive device in the desired, preferably programmed, manner.Furthermore, the safety switch is activated in the non-operational mixing tool use position of at least one mixing tool, and thus when the telescopic device is at least partially extended, so that operation of the mixing tool drive device and / or the mixing container drive device is blocked. In this state, the control device preferably blocks the actuation of the mixing tool drive device and, if present, also the mixing container drive device, even when the actuating device is activated.

[0039] According to a further particularly preferred embodiment, a bridging device is provided which is coupled to the control device in a signal-transmitting manner and which is suitable and designed to activate the mixing tool drive device when it is actuated and / or when the actuating device is activated, provided that the at least one mixing tool is not in the operational mixing tool use position, or to block it when the at least one mixing tool is in the operational mixing tool use position, so that the mixing tool drive device cannot be activated by means of the bridging device in the operational mixing tool use position.Preferably, the bridging device comprises a freely accessible manual switch, preferably on the mixing tool drive device, most preferably on a handle device of the mixing tool drive device, upon actuation of which the bridging device can be activated, preferably only when the actuating device is activated, and preferably can be activated in a speed-controlled manner. Speed-controlled activation can be implemented particularly easily and reliably with a manual switch, for example in such a way that the mixing tool drive device runs faster the harder the manual switch is pressed. This means, for example, that the harder the bridging device, formed for example by a manual switch, is pressed or pressed in, the faster the drive motor runs.This function enables the user, while the mixing container is not yet rotating, to immerse the at least one mixing tool in a targeted and slow manner into the mix using manual speed control via the bridging device, thus preventing the material from splashing out. This is particularly advantageous if, as will be explained in more detail below, according to a particularly preferred embodiment, the mixing container only rotates for safety reasons when the mouth opening of the mixing container is covered by a cover element. After the mixing process, the mixing tool drive device and the mixing container drive device preferably switch off simultaneously, so that when the at least one mixing tool is withdrawn from the mix, the mixing container is no longer driven but preferably remains fixed in its position.And now, at least one mixing tool can be pulled out of the mix container again in a targeted and slow manner. This also allows for targeted, successive centrifuging of the mix at a controllable speed, depending on the operator's wishes, and any material adhering to the mixing tool can be centrifuged off without splashing out. The mixing tool is then almost completely free of any adhering mix and can be reused immediately without further cleaning.

[0040] According to a further particularly preferred embodiment, it is provided that the telescoping device, preferably in the region above the at least one mixing tool, has a cover element which is displaceable together with the at least one mixing tool and, in the preferably operational mixing tool use position, closes the mouth opening of the mixing container at least in regions, preferably closes it in such a way that no finger penetration into the receiving space of the container is possible and / or a gap is formed between the peripheral edge region of the cover element and a container wall region adjoining the cover element or peripherally adjacent to it.Such a cover element reliably closes the mixing container's mouth opening when the mixing tool is in the ready-to-use position, preventing the risk of accidents caused by inadvertent access to the mixing container during the mixing process. Furthermore, the cover element also provides protection against the ingress of unwanted foreign matter, such as dust or other contaminants that could impair the mixing process. Furthermore, it reliably prevents the mixing material from splashing out. A gap between the peripheral edge area and the container wall area adjacent to the cover element also ensures collision-free, unhindered rotation of the mixing container relative to the cover element.

[0041] For a compact and easy-to-manufacture structure, it is particularly preferred that the cover element, preferably formed by a cover plate or a lid, is arranged on the upper telescopic element and can be lowered together with it.

[0042] For a further particularly compact construction, which brings about a simple functional separation of the at least one mixing tool from the mixing tool drive device, it is provided that the cover element is arranged between the at least one mixing tool and the mixing tool drive device.

[0043] The mixing tool drive device is preferably formed by a drive motor, preferably an electric motor, whose at least one drive shaft drives the at least one mixing tool in rotation. Such drive motors can reliably deliver the desired high power and high torque, which is particularly important when heavy and viscous materials need to be mixed. This promotes an efficient mixing process. Drive motors, particularly in the form of electric motors, also offer the possibility of variable speed control, which results in increased flexibility with regard to different mixing requirements and different materials. In addition, electric motors can be operated with high energy efficiency and are characterized by a long service life with low maintenance.In conjunction with such a drive motor, it is also possible to easily guide the at least one drive shaft or a connecting part of the at least one mixing tool that can be connected to the at least one drive shaft through the cover element for a particularly compact design. This reliably preserves the original functionality of the cover element.

[0044] According to another particularly preferred embodiment, the cover element can have at least one, preferably elongated and / or pin-like and / or strip-like, edge scraper, which, in the ready-to-use mixing tool position, projects into the receiving space of the mixing container, preferably spaced there from the receiving space inner wall by a defined gap. The arrangement of the edge scraper on the cover element results in a compact and space-saving arrangement, which also helps to reduce the component expenditure, since the cover element, in an advantageous dual function, no longer assumes its original function of covering the mouth opening of the mixing container, but also holds the edge scraper. The edge scraper also contributes significantly to minimizing the formation of material deposits on the inner walls of the receiving space.This not only benefits the cleanliness of the overall mixing process, but also ensures even material distribution during the mixing process. This advantageously optimizes the mixing quality.

[0045] According to a further particularly preferred embodiment, the mixing tool drive device, preferably a drive motor, is accommodated in a drive device housing that is arranged on the upper telescopic element, preferably in the region above the mixing container receptacle. The accommodation of the mixing tool drive device, in particular a drive motor, in a drive device housing ensures, on the one hand, that the mixing tool drive device is reliably protected from environmental influences, such as dust, moisture, or other potential contaminants that may occur on a construction site. Furthermore, it helps to extend the service life of the drive device and reduce maintenance costs. Furthermore, this also contributes to occupational safety, particularly when operators are in the vicinity of the mixing machine.Furthermore, the integration of the mixing tool drive unit into a drive unit housing on the upper telescoping element allows for an aesthetically pleasing design. The arrangement of the drive unit housing on the upper telescoping element also enables the simple and reliable connection of additional components, such as control elements or sensors.

[0046] The latter also applies to a particularly preferred embodiment in which the drive device housing has a handle device. The handle device enables particularly convenient operation of the telescoping device, in particular also intuitive operation by the operator in order to move the at least one mixing tool into the desired positions by means of the telescoping device. Particularly advantageous in this context is an embodiment in which the handle device has two, viewed transversely to the vertical axis direction, preferably approximately U-shaped, handle elements located on opposite sides of the drive device housing, preferably each with at least one handle spaced apart from the drive device housing.Such a handle device enables a particularly advantageous two-handed operation of the telescopic device when transferring the at least one mixing tool into the respectively desired mixing tool position.

[0047] For the energy supply, the construction site mixer preferably has an energy connection, preferably a cable connection, via which the construction site mixer can be supplied with energy, wherein electrical lines are led from the energy connection to the components and functional units that can be supplied with energy, in particular with electricity.Specifically, at least one contact element arranged on the lower telescoping element or on the mixing container receptacle can interact with a counter-contact element arranged on the upper telescoping element, which is connected to the control device for signal transmission, in such a way that the contact element is in contact with the counter-contact element in the operational mixing tool use position of the at least one mixing tool, and thus when the telescoping device is retracted, so that the mixing tool drive device can be controlled and activated by the control device when the actuating device is activated. Such a configuration represents an additional safety function, since the mixing container drive device can only be activated and actuated when the mixing tool has been moved into the correct operational mixing tool use position.Analogously, alternatively or additionally, for the energy supply of the mixing container drive device, it can be provided that, preferably additionally, at least one, preferably further, contact element is arranged on the lower telescopic element or on the mixing container receptacle, which interacts with a, preferably further, counter-contact element arranged on the upper telescopic element, which is connected to the energy connection in an energy-transmitting manner, in such a way that the contact element is in contact with the counter-contact element in the operational mixing tool use position of the at least one mixing tool and thus when the telescopic device is retracted, so that the mixing tool drive device can be supplied with energy when the actuating device is activated. This type of contact making or contact transmission also has the advantage that no trailing cable needs to be carried during the vertical movement in the x-direction.

[0048] According to a further particularly preferred embodiment, it is provided that a handle element, preferably a bow handle as the handle element, is provided on the upper telescopic element, preferably on the upper free end region of the upper telescopic element, which handle element protrudes from the upper telescopic element, and / or that at least one wheel, preferably at least one wheel axle with two wheels arranged opposite one another in the transverse direction, and / or at least one carrying handle is arranged on the mixing container receptacle, preferably in the region below the handle element, wherein it is preferably provided that the wheel axle forms the carrying handle. Such a handle element offers a safe possibility of transporting the construction site mixer, in particular of moving it if the construction site mixer is designed to be movable, for example by means of wheels arranged on the mixing container receptacle.This is particularly advantageous with a design in which the handle element is arranged on the side of the upper telescopic element opposite the mixing container and / or the drive device housing, and / or with a design in which the at least one wheel is arranged below the handle element relative to the vertical axis. If a carrying handle is provided, the mixer can also be easily grasped and transported. Furthermore, if the carrying handle is also formed by the wheel axle, a high degree of functional integration with reduced components is achieved.

[0049] Furthermore, the control device, which is preferably an electronic control device, can also be arranged on the side of the upper telescopic element opposite the mixing container and / or the drive device housing, with the handle element then being arranged above the control device relative to the vertical axis and / or projecting beyond the control device with a portion of the handle element. Thus, in a particularly advantageous dual function, the handle element can also form a fall protection element that prevents the control device from being damaged if the construction site mixer falls over.

[0050] The handle element and wheel or wheels also enable a design in which at least one wheel projects laterally beyond the mixing container receptacle with at least a partial area in such a way that the construction site mixer, in a lying position, rests and is supported on a support surface, for example a floor as a support surface, on the one hand by means of the at least one wheel and on the other hand by means of the handle element, and the mixing container and the mixing tool drive device together with the at least one mixing tool are on top. In such a lying position, for example, the construction site mixer can be easily transported or compactly stowed. Furthermore, this also ensures functionally reliable fall protection, which reliably prevents damage to the control device, particularly in conjunction with a control device as already described above.

[0051] For a functionally reliable stand of the construction site mixer in its use position, it is also advantageous if at least one support foot is arranged on the side opposite the at least one wheel of the mixing container holder, which has an elongated shape and / or is box-like or cuboid-shaped.

[0052] The mixing container and in particular the receiving space of the mixing container can, in principle, have any suitable shape. However, an embodiment in which at least the receiving space of the mixing container, preferably the mixing container as a whole, has a substantially circular-cylindrical and / or downwardly tapered shape is particularly advantageous. Such mixing containers are easy to manufacture and are particularly suitable for optimized and efficient use of a mixing process of a construction site mixing machine according to the invention. The mixing containers preferably have a filling volume of 20 liters to 50 liters, purely by way of example. A rotating drive for such a mixing container is particularly advantageous because it reliably helps to avoid undesirable imbalances.

[0053] The at least one mixing tool can, in principle, be firmly and permanently connected to the mixing tool drive device. This can be the case, for example, with construction site mixing machines that always have to perform the same mixing tasks. For increased flexibility and functionality, however, it is advantageous if the at least one mixing tool can be detachably connected to the mixing tool drive device. This allows different mixing tools, for example stirrers with different geometries, to be used and interchanged, thereby achieving easy adaptation of the mixing tools to different mixing materials. Alternatively or additionally, the flexibility and variety of applications can be further increased by mounting the at least one mixing tool on the mixing tool drive device in a height-adjustable manner.

[0054] The control device itself can typically comprise a microcontroller or a PLC (programmable logic controller), which processes the incoming signals, executes the control logic, and sends control signals to, for example, the drive motor of the at least one mixing tool. The preferably programmable control device can also typically comprise a control panel with switches, buttons, and possibly a display, which allows the operator to control the construction site mixer and monitor its operating status. This can include setting the mixing speed, start / stop functions, and, of course, other desired parameters.

[0055] The invention further relates to a method for operating a construction site mixer. The resulting advantages are identical to those of the construction site mixer according to the invention, so that reference is made to the above statements to avoid repetition.

[0056] The invention is explained in more detail below with reference to a drawing.

[0057] They show: Fig. 1 is a schematic and perspective side view of an exemplary embodiment of a construction site mixing machine according to the invention, in which the mixing tool is not in the ready-to-use mixing tool position, Fig. 2 is a schematic partial sectional view of the illustration according to Figure 1 , Fig. 3one of the Figure 1corresponding front view, in which the mixing tool is pivoted into a filling position in which the mixing container is freely accessible for filling and the suction device is in the suction position, Fig. 4a a view according to the illustration Figure 3 corresponding front view of the construction site mixer with a mixing tool pivoted into the mixing tool insertion position, in which the mixing tool is located directly above the mouth opening of the mixing container, Fig. 4 legs of the Figure 4a corresponding side view, Fig. 5 a schematic perspective top view of the construction site mixer when transferring the mixing tool into the ready-to-use mixing tool position, Fig. 6a a schematic front view of the construction site mixer with a mixing tool transferred into the ready-to-use mixing tool position, Fig. 6b a representation of the Figure 6a corresponding side view, Fig. 6c, a representation of the Figures 6a and 6b corresponding perspective top view of the construction site mixer with a mixing tool transferred into the ready-to-use mixing tool position, Fig. 7a an exemplary embodiment of a safety switch forming part of a safety device in the activated, forced-operated state, Fig. 7b the safety switch of the Figure 7a in the deactivated state, Fig. 8 a detailed view of an exemplary embodiment of a locking device with which the telescopic device and thus the mixing tool in the, in the Figure 3 shown filling position is releasably lockable, Fig. 9 a schematic and exemplary detailed view of the gas pressure spring of the telescopic device together with a locking and unlocking device in the locked state, Fig. 10 one of the Figure 9corresponding representation in the unlocked state, Fig. 11 a cross section through an alternative embodiment with a form-fitting holding device for the mixing container on the mixing container holder, Fig. 12 a schematic plan view of the basic arrangement of the holding device according to Figure 11 .

[0058] In the Figure 1 a schematic and perspective representation of an exemplary embodiment of a construction site mixing machine 1 according to the invention is shown, which is designed here as a movable and thus mobile construction site rotary mixing machine.

[0059] The construction site mixer here has a mixing container 2 which is open at the top and which is suitable and designed to receive a mixture, for example plaster, screed, concrete, mortar, slurry, resins or the like, in its receiving space 3.

[0060] The mixing container is accommodated in a mixing container holder 4, which here has a housing part 5 arranged at the bottom with respect to the vertical axis direction x, which has an elongated shape and is designed in the form of a box or cuboid. As can be seen in particular from the Figure 2As can be seen in Fig. 1, which shows a sectional view through the lower area of ​​the construction site mixer 1, a drive motor forming a mixing container drive device 6 is accommodated in the housing part 5. The drive motor drives a rotary axis 8 via a chain 7, for example, which, in the example shown here, is centrally and centrally connected to the underside of a receiving element 9 formed by a turntable. Instead of a chain, any other suitable drive means could of course be used, for example a toothed belt. The turntable is a component of the mixing container holder 4 and is rotatably mounted on the housing part 5. For this purpose, the rotary axis 8 passes through the housing part 5.

[0061] As can be seen from the Figures 1 and 2As can be seen further, the turntable 9 here forms a flat or level storage surface on which the mixing container 2 can be placed for its reception in the mixing container holder 4.

[0062] The mixing container 2, which here preferably and by way of example has a substantially circular-cylindrical shape and tapers conically downwards, is detachably held on the turntable 9 by means of a holding device 10, wherein the holding device 10 is formed here merely by way of example by a plurality of clamping brackets 11 arranged circumferentially spaced from one another on the turntable 9, which clamp a lower container region of the mixing container 2, relative to the vertical axis direction x, detachably and thereby reliably in the, in the Figure 1 and 2 Alternatively or additionally, as shown in the Figures 11 and 12can be seen, but it can also be provided that, in order to form a positive-locking holding device 10, at least one driver element 67 is arranged on the mixing container receptacle 4, here for example in the area of ​​the storage surface of the mixing container receptacle 4, which driver element interacts with at least one driver counter-element 68 of the mixing container 2 in the shown position of use of the mixing container 2. This at least one driver counter-element 68 is preferably arranged on the underside of the mixing container 2 and here is further designed for example in the form of a driver tab, for example injection-molded. Overall, in the example shown here, a plurality of driver counter-elements 68 are provided which are spaced apart from one another in the circumferential direction, thereby ensuring that the driver function acts quickly and reliably even when the direction of rotation of the mixing container drive device 6 is reversed. In addition orAlternatively, several driver elements 67 can be arranged circumferentially distributed on the mixing container holder, although this is not shown here. This ensures, in a simple and reliable manner, that the mixing container can no longer slip during operation.

[0063] The drive motor forming the mixing container drive device 6 is preferably formed by an electric motor which, as will be described in more detail below, is preferably only actuated when a mixing tool 16 is in an operational mixing tool use position.

[0064] The housing part 5 and thus the mixing container holder 4 also has, by way of example only, the Figures 1 and 2left, front side of the housing part 5 a support foot 12 and on the opposite, rear, right side of the housing part 5 a wheel axle 13 with wheels 14, so that the construction site mixer 1 can be placed safely and reliably on a floor surface in the use position and can also be moved by means of the wheels 14 if necessary.

[0065] As is particularly evident from the Figure 2 As can be seen, the wheel axle 13 is exposed in the right, rear area of ​​the housing part 5, so that it simultaneously forms a carrying handle in a dual function, by which the mixing container holder 4 can be grasped, so that the mixing container holder 4 can be comfortably grasped and carried by a user with two hands.

[0066] As can be seen from the Figures 1 and 2As can be seen further, the construction site mixer 1 further comprises a mixing tool displacement device 15, which is formed here by a telescopic device and by means of which a mixing tool 16 can be moved between a mixing tool 16 which will be described in more detail below and shown in the Figures 6a , 6b and 6c shown operational mixing tool use position, in which the mixing tool 16 is accommodated in the receiving space 3 of the mixing container 2, and one shown, for example, in the Figures 1 and 2 shown mixing tool non-use position, in which the mixing tool 16 is not in the operational mixing tool use position.

[0067] The mixing tool displacement device 15 formed by a telescoping device has, for example, two telescoping elements 17, 18 which are telescopic relative to one another in the direction of the telescoping axis with respect to the telescoping device, wherein in the example case shown here, a lower, stationary telescoping element 17 is provided in the direction of the telescoping axis, to which an upper telescoping element 18 which is displaceable relative thereto is connected, upwards in the direction of the telescoping axis, and on which a mixing tool drive device 19, which will be described in more detail below, is held or arranged together with a mixing tool 16 arranged thereon.In the example shown here, the vertical axis direction x corresponds approximately to the telescopic axis direction of the telescoping device 15, whereby the telescoping device 15 can optionally be slightly inclined forward against the vertical axis direction toward the mixing container 2, for example, in order to achieve a specific arrangement of the mixing tool 16 in the mixing container 2. The inclination is preferably between 1° and 10°, most preferably between 3° and 6°.

[0068] Specifically, in the exemplary embodiment shown here, the lower telescopic element 17 projects upwards in the vertical axis direction x from a projection 20 of the housing part 5 projecting laterally beyond the turntable 9, optionally also, as already explained, inclined by 1° to 10°, preferably by 3° to 6°, against the vertical axis direction, so that the telescopic device 15 forming the mixing tool displacement device 15 projects upwards laterally next to the mixing container in the vertical axis direction x.

[0069] In the in the Figure 1 and 2In the extended position of the telescopic device 15 shown, the free lower end of the mixing tool 16 is located in the area above the mouth opening 21 or above the mixing container upper edge 22 of the mixing container 2, in which the upper telescopic element 18 is rotatable or pivotable relative to the lower telescopic element 17 in a horizontal plane about the longitudinal axis of the telescopic device 15. As a result, the mixing tool 16 in this extended position of the telescopic device 15 is pivotable by means of the upper telescopic element 18 in a horizontal plane lying above the mixing container upper edge 22 between a mixing tool insertion position, in which the mixing tool 16, as shown in the Figures 4a and 4b shown, is located directly above the mouth opening 21 of the mixing container 22 and is prepared for transfer into the ready-to-use mixing tool position, and which is in the Figures 1 to 3 , especially the Figure 3 , in which the mixing tool 16 is arranged laterally outside the mixing container 2, so that the mouth opening 21 of the mixing container 2 is exposed for its unhindered filling.

[0070] This pivoting movement in the horizontal plane above the mixing container upper edge 22 is preferably limited by a pivot angle limiting device, which is formed, for example, by stop elements not shown here between the lower telescopic element 17 and the upper telescopic element 18 and by means of which a first maximum pivot position is defined, which essentially corresponds to the Figure 4a shown mixing tool insertion position, and a second maximum pivoting position is defined in which the mixing tool 16, as for example in the Figure 3is clearly visible, is arranged laterally outside the mixing container 2, preferably pivoted outwards by approximately 95° away from the mixing tool insertion position.

[0071] To ensure that the upper telescopic element 18 is in the Figure 3 shown filling position cannot be swivelled back in an undesirable manner towards the mixing tool insertion position, a locking device 23 (see Figure 8) can be provided, which is designed here as a releasable locking and / or snap connection and in which a locking element 24 of the upper telescopic element 18, which is pre-tensioned in the direction of locking engagement by means of a pre-tensioning element (not shown here), for example a spring element, snaps behind a locking counter-element 25 of the lower telescopic element 17 after a predetermined pivoting path of the upper telescopic element (relative to the stationary, lower telescopic element 17) and is releasably locked there. The locking element 24 is here coupled, for example, to an actuating element 26 in the form of a hand knob, by means of which the locking element 24 can be brought out of locking engagement with the locking counter-element for unlocking against the force of the (not shown) pre-tensioning element. This is achieved in a particularly simple embodiment in that the operator moves the Figure 8 is pulled.

[0072] As is particularly evident from the Figures 1 to 3 As can be clearly seen, the actuating element 26 formed by the hand knob is arranged in a lower region of the upper telescopic element 18 in such a way that it is easily and freely accessible in the filling position.

[0073] Alternatively or additionally, it can also be provided that the locking element can be disengaged from the locking counter-element 25 by a displacement of the upper telescopic element 18 in the direction of the telescopic axis or in the vertical axis direction x upwards or downwards. In both cases, it is ensured in any case that after unlocking, a pivoting of the upper telescopic element 18 in this height position of the upper telescopic element 18 in the direction back to the mixing tool insertion position (see Figure 4a ) is released.

[0074] As is particularly evident from the Figure 9As can be seen, the telescoping device 15 further comprises a gas pressure spring 28 as an elastic pre-tensioning element, by means of which the telescoping device 15 or the lower telescoping element 17 and the upper telescoping element 18 can be pre-tensioned into the extended position, so that the telescoping device 15 can be held in the extended position by means of the gas pressure spring 28 in a functionally reliable manner and can only be moved against the pre-tensioning force of the gas pressure spring 28 into the Figures 6a , 6b and 6c shown ready-to-use mixing tool position can be transferred.

[0075] A suction device 29 is arranged on the upper telescopic element 18 or in a lower region of the upper telescopic element 18, relative to the vertical axis direction x, by means of which suction material, for example dust, accumulating in the region of the mouth opening 21 can be suctioned away. For this purpose, the suction device 29 is provided with a suction pipe 30, here, for example, a suction pipe 30 that is open on both sides and / or formed by a straight pipe section.

[0076] The first suction pipe opening 31 of the suction pipe 30 is located in the extended position of the telescopic device 15 in the area above the mixing container upper edge 22, in particular directly above the mixing container upper edge 22. In contrast, the first suction pipe opening 31 is in the, in the Figures 1 to 3The suction pipe 32 is directed in the direction of the mouth opening 21 of the mixing container 2 in the suction position shown, which corresponds to the filling position of the mixing container. A second suction pipe opening 32, opposite the first suction pipe opening 31, is coupled to a suction device 33, shown only very schematically here, for example, to a vacuum cleaner or the like. Overall, such a suction device 29 thus achieves reliable and functionally safe dust extraction during the filling of the mixing container 2 with a mixture.

[0077] As this can be seen very well from the Figures 1 and 2 As can be seen, the first suction pipe opening 31 is bevelled, here only as an example with a bevel angle of approximately 25°, whereby on the one hand the suction surface is increased and on the other hand the mixing container 2 cannot get caught on the suction pipe 30 when it is removed.

[0078] To ensure that the mixing tool 16 can only be moved in the direction shown in the Figure 4a and in the Figure 4b shown mixing tool insertion position, in which the mixing tool 16 is located directly above the mouth opening 21 of the mixing container 2, can be lowered downwards in the direction of the ready-to-use mixing tool position, a positive guide device can be provided which allows the lowering of the upper telescopic element 18 only in the Figure 4a and 4bshown mixing tool insertion position. This is not shown in detail here, but can be formed, for example, by a positive guide device which has a first positive guide element arranged or formed on the lower telescopic element 17, for example a guide slot, which interacts with a second positive guide element arranged and formed on the upper telescopic element 18, for example in a sliding block positively guided in the guide slot.

[0079] Alternatively or in addition to this, as is the case here in connection with the Figure 5is shown, a positive guide device 34 is provided, which is formed by a centering blade 35 arranged on the upper telescopic element 18, which protrudes from a lower end region of the upper telescopic element 18 facing the mixing container receptacle 4, and a centering receptacle 36 on the upper side of the housing part 5 of the mixing container receptacle 4. As can be seen from the Figure 5 As can be clearly seen, the centering blade 35 engages in the centering recess 36 on the mixing container receptacle 4 or on the housing part 5 when lowering the upper telescopic element 18 (arrow 37) after a defined lowering path of the upper telescopic element 18, so that the upper telescopic element 18 is non-rotatable and positively guided into the Figures 6a to 6c shown mixing tool usage position can be transferred.

[0080] As this is further shown in particular by the Figure 5As can be clearly seen, in the embodiment shown here the lower telescopic element 17 is accommodated in the upper telescopic element 18 in the collapsed state and is thus reliably and functionally protected from contamination.

[0081] In the Figures 6a to 6c The mixing tool use position shown is the telescopic device 15 or, more specifically, the displacement of the upper telescopic element 18 relative to the lower telescopic element 17 by means of a locking device 38 (see Figure 9 ) locked or releasably locked.

[0082] As the Figure 9 can be removed further, the locking device 38, which is formed, for example, by a spring-loaded locking mechanism, in the example shown here has a locking element 39 formed on the upper telescopic element 18, which in the, in the Figure 9shown locking position is releasably locked with a locking counter element 40 of the lower telescopic element 17. In the Figure 9 In the embodiment shown, the locking element 39 formed on the upper telescoping element 18, here for example a locking hook, is pivotally mounted on the upper telescoping element 18 against the force of a spring (not shown here) such that when the upper telescoping element 18 is lowered, it snaps behind the locking counter-element 40, here for example a locking groove, and thus releasably locks the mixing tool 16 in the retracted position of the telescoping device 15 in the desired operational, ready-to-use position of the mixing tool. Accordingly, the locking position of the locking device 38 is designed and coordinated essentially exactly and precisely with the operational, ready-to-use position of the mixing tool or the retracted position of the telescoping device 15.

[0083] As can be seen from the Figure 9 As can be seen further, the locking element 39 of the locking device 38 is further coupled to a lever which forms an unlocking element of an unlocking device and when actuated (lifting in the direction of the arrow 42), the locking element 39 is displaced, in the example shown here, pivoted, so that it comes out of engagement with the locking counter-element 40, whereby the upper telescopic element 18 is moved by means of the gas pressure spring 28 from the ready-to-use mixing tool position, as shown in the Figures 6a to 6c shown, back up (see Figures 1 to 5 ) is shifted towards the extended position of the telescoping device 15, as is also shown in the Figure 10 is shown.

[0084] The construction site mixer 1 according to the invention further comprises a control device 44 which electronically controls the activation and deactivation of the mixing tool drive device 19, wherein the control device 44 is coupled to an actuating device 45 by means of which the control device 44 can be activated and, if necessary, deactivated. As can be seen in particular from the Figure 5 and the Figure 6c which are clearly visible, each showing a perspective top view of the construction site mixer 1, the actuating device 45 is formed here, for example, by a main switch 46 acting as an on / off switch, which enables the operation of the construction site mixer 1 when switched on and blocks the operation of the construction site mixer 1 when switched off.

[0085] The construction site mixing machine 1 further comprises a safety device 43 which is suitable and designed to enable the operation of the mixing tool drive device 19 when the confirmation device 45 is activated, i.e. when the main switch 46 is switched on, when the mixing tool 16 is in the ready-to-use mixing tool position of the Figures 6a to 6c and in addition, at least in the embodiment shown here, the telescopic device 15 is also releasably locked by means of the locking device 38, or to lock if the mixing tool 16 is not in the position in which Figures 6a to 6c shown operational mixing tool use position and, moreover, at least in the embodiment shown here, the telescoping device 15 is not releasably locked by means of the locking device 38.

[0086] For this purpose, the safety device 43, as shown only very schematically and by way of example in the Figures 7a and 7b shown, specifically have a safety switch 47 as a monitoring device, which is coupled to the control device 44 in a signal-transmitting manner. As can be seen from the overview of the Figures 7a and 7b As can be seen, the safety switch 47 is in the ready-to-use mixing tool position of the mixing tool 16 ( Figure 7b ) and thus deactivated when the telescopic device 15 is retracted, so that both the operation of the mixing tool drive device 19 and the operation of the mixing container drive device 6 are enabled. Specifically, the safety switch 47 can have a spring-loaded switch element 48a pivotally mounted on the upper telescopic element 18, which in the Figure 7bshown collapsed position of the telescoping device, which corresponds to the ready-to-use position of the mixing tool, is displaced into a groove recess 49 on the lower telescoping element 17, so that the switch element 48a is brought out of contact with a counter-contact element 48b and thus the safety switch 47 is deactivated.

[0087] If the upper telescopic element 18 is now moved as shown in the Figure 7ashown, is displaced upwards relative to the lower telescoping element 17, the switch element 48a is simultaneously moved out of the groove recess 49 and, through its pivot bearing, is brought into contact with the counter-contact element 48b, whereby the safety switch 47 is activated and the operation of the mixing tool drive device 19 and the mixing container drive device 6 is blocked. It is understood that the specific embodiment of a safety switch 47 shown here as a monitoring device is merely one of many possibilities for designing such a safety switch or position switch. Alternatively or additionally, other sensory or non-sensory monitoring devices can of course also be provided, which operate, for example, with optical sensors, such as light barriers or the like.

[0088] The control device 44 is suitable and designed, preferably programmable, so that the mixing tool drive device 19 and the mixing container drive device 6 can be operated together when the main switch 46 is switched on and the actuating device 45 is thus activated. This means that both the mixing container 2 and the mixing tool 16 are driven by their respective drive devices. Thus, the control device 44 is preferably programmed such that the mixing tool drive device 19 is activated before the mixing container drive device 6, for example, the mixing tool drive device 19 is activated approximately 0.5 seconds to 5 seconds before the mixing container drive device 6.

[0089] The safety device 43 or the safety switch 47 thus ensures that the operation of the mixing container drive device 6 and the operation of the mixing tool drive device 19 is only enabled when the mixing tool 16 is in the position specified in the Figures 6a to 6c shown operational mixing tool use position, in which, at least in the exemplary embodiment shown here, the telescoping device 15 is also releasably locked by means of the locking device 38.

[0090] The telescoping device 15 further comprises a cover element 50, which is formed here by a cover plate, which, as can be seen in particular from the synopsis of the Figures 1 and 6c can be seen, is arranged on the upper telescopic element 18 and is displaceable together with this, so that the cover element 50 covers the mouth opening 21 of the mixing container 2 in the ready-to-use mixing tool position (see Figure 6c ) is closed essentially completely, in particular in such a way that no finger penetration into the receiving space 3 of the mixing container 2 is possible or that a gap is formed between the peripheral edge region of the cover element 50 and a container wall region adjoining the cover element 50, here essentially formed by the mixing container upper edge 22.

[0091] The mixing tool drive device 19 is formed here, for example, by a drive motor, preferably by an electric motor, whose drive shaft drives the mixing tool 16 in rotation. As can be seen in particular from the Figures 3 , 4b and 5As can be clearly seen, the cover element 50 formed by the cover disc is arranged locally between the mixing tool 16 and the mixing tool drive device 19, so that the drive shaft or, as in the example shown here, a connecting part 51 of the mixing tool 16 that can be connected to the drive shaft is passed through the cover element 50.

[0092] The cover element 50 further comprises an elongated, pin- and strip-like edge scraper 52 which, in the ready-to-use mixing tool position, projects into the receiving space 3 of the mixing container 2 and is spaced there from the receiving space inner wall by a defined gap distance.

[0093] The mixing tool drive device 19, which is formed here by way of example by a drive motor, is accommodated in a drive device housing 53 which is arranged on the upper telescopic element 18 in the region above the cover element 50.

[0094] As is particularly evident from the Figure 5 As can be clearly seen, the drive device housing 53 has a handle device 54, which in the example shown here for two-hand operation has two, seen transversely to the vertical axis direction x, on opposite sides of the drive device housing 53, here for example approximately U-shaped handle elements 55, 56, which each have a handle 57, 58 spaced apart from the drive device housing 53. By means of these two handles 57, 58, the drive device housing 53 can be comfortably grasped with two hands and the upper telescopic element 18 in the direction of the arrow 37 in the Figure 5 against the force of the gas pressure spring 28 downwards towards the ready-to-use mixing tool position.

[0095] As is the case, for example, in the Figure 3is shown only schematically and in principle, a manual switch 59 can be provided on the handle 58, which is part of a bridging device that is coupled to the control device 44 in such a way that the mixing tool drive device 19 can be activated to drive the mixing tool 16 when the manual switch 59 is actuated, provided that the at least one mixing tool 16 is not in the ready-to-use mixing tool position. If, on the other hand, the mixing tool 16 is in the ready-to-use mixing tool position, the drive of the mixing tool drive device 19 is blocked, so that the mixing tool drive device 19 can no longer be activated by means of the bridging device in the ready-to-use mixing tool position.

[0096] As this further emerges from the Figure 5As can be seen, a time selector switch 60 can be arranged on the control device 44, by means of which different operating times of the mixing tool drive device 19 and the mixing container drive device 6 can be set. For example, mixing times between 0.5 minutes and 5 minutes can be set here, whereby the setting can be made continuously or in stages. The control device 44 is programmed, for example, such that after the set period of time has elapsed, the mixing tool drive device 19 and the mixing container drive device 6 are automatically deactivated and thus no longer driven. Analogous to activation, the deactivation can also take place simultaneously or with a time delay.

[0097] As this is particularly evident from the overview of Figures 6b and 6cAs can be clearly seen, a handle element 61 is provided at an upper free end region of the upper telescopic element 18, which is designed here only as an example as a bow handle and protrudes from the upper telescopic element in such a way that it guides the control device 44, relative to the image plane of the Figure 6b , extends to the rear. This allows the construction site mixer 1, from which the Figure 6b From the upright position shown, for example, it can be tilted 90° to the right and placed in a lying position, in which the construction site mixer 1 is supported on the ground via the wheels 14 and the handle element 61, without the control device 44 touching the ground. This also clearly provides fall protection for the control device 44.

[0098] As this further shows very well from the Figures 6b and 6cAs can be seen, a cable connection 62 is provided on the rear side of the upper telescopic element 18, here, for example, above the suction pipe 30, via which the two drive devices 6, 19, preferably formed by electric motors, as well as the control device and all electronic functional units and components of the construction site mixer 1, can be supplied with energy or current. For this purpose, an energy storage element, for example, an accumulator or the like, can also be provided in the area of ​​the cable connection 62.

[0099] The cable or line routing is preferably protected on or within the telescopic device 15 and the mixing container holder 4.

[0100] For the electrical contacting of the mixing container drive device 6 formed by an electric drive motor, according to an optional embodiment, as can be seen in particular from the Figure 2As can be seen, in the area of ​​the mixing container receptacle 4, preferably in the housing part 5, a first contact element 63 in the form of a contact pin can be arranged, which, in the event that the upper telescopic element 18 is lowered so far downwards that the mixing tool 16 is in the ready-to-use mixing tool position, is in contact with a first counter-contact element (not shown here) arranged on the upper telescopic element 18 and is connected to the control device 44 in a signal-transmitting manner. Furthermore, a further, second contact element 64 can also be provided, which can be brought into contact in an analogous manner with a further second counter-contact element (likewise not shown here) arranged on the upper telescopic element 18 in order to connect this to the cable connection 62 in an energy-transmitting manner.The contact elements 63, 64 with their correspondingly assigned counter-contact elements thus form a further safety element that ensures that the mixing container drive device 6 can only be operated when the mixing tool 16 has been moved into the correct desired mixing tool usage position by means of the upper telescopic element 18. This type of contact making or contact transmission also has the advantage that no trailing cable is required during the vertical movement in the x-direction.

[0101] As in the Figures 9 and 10 As shown, a further contact point can also optionally be provided in the area of ​​the locking device 38, which is formed here by a contact element 65 which is arranged on the lower telescopic element 17 and which, in the Figure 9shown mixing tool use position, is in contact with a contact element 66 arranged on the upper telescopic element 18, which is designed here only as an example by a spring-loaded contact pin, so that the energy supply of the mixing container drive device 6 is only ensured when the locking device 38 is locked. In the Figure 10In the unlocked position shown, which corresponds to the mixing tool non-use position, the contact element 65 of the lower telescopic element 17 is disengaged or out of contact with the counter-contact element 66 arranged on the upper telescopic element 18, so that the power supply to the mixing container drive device 6 is interrupted. Here, too, the contact element 65 and the counter-contact element 66 form a further safety element that ensures that the mixing container drive device 6 can only be operated when the mixing tool 16 has been moved into the correct desired mixing tool use position by means of the upper telescopic element 18. And here, too, this type of contact making or contact transmission has the advantage that no trailing cable needs to be carried during the vertical movement in the x-direction. List of reference symbols

[0102] 1 Construction site mixer 2 Mixing container 3 recording room 4 Mixing container holder 5 Housing part 6 Mixing tank drive device / drive motor 7 Chain 8 axis of rotation 9 Recording element / turntable 10 Holding device 11 clamp 12 Support foot 13 wheel axle 14 Wheels 15 Mixing tool relocation device / telescoping device 16 Mixing tool 17 lower telescopic element 18 upper telescopic element 19 Mixing tool drive device / drive motor 20 Overhang 21 muzzle opening 22 Mixing tank top edge 23 Locking device 24 locking element 25 Locking counter element 26 Actuating element 27 Arrow 28 Gas spring / preload element 29 Extraction device 30 Suction pipe 31 first suction pipe opening 61 Handle element 32 second suction pipe opening 62 Cable connection / power connection 33 Suction device 63 Contact element 34 Forced guidance device 64 Contact element 35 Centering blade 65 Contact element 36 Centering mount 66 Counter contact element 37 Arrow 67 Driver element 38 Locking device 68 Driving counter element 39 locking element 40 Locking counter element 41 lever 42 Arrow 43 Safety device 44 Control device 45 Actuating device 46 main switch 47 Safety switch / monitoring device 48 a Switch element 48 b Counter contact element 49 Groove recess 50 Cover element / cover plate 51 connecting part 52 Edge scraper 53 Drive unit housing 54 Handle device 55 Handle element 56 Handle element 57 handle 58 Hand switch 59 Hand switch 60 Time selector switch

Claims

1. Construction site mixing machine (1), in particular a mobile construction site rotary mixing machine, for mixing mixed materials, in particular for mixing plaster, screed, concrete, mortar, slurries or resins, with an upwardly open mixing container (2) which is suitable and designed to receive a mixed material in its receiving space (3), with a mixing tool displacement device by means of which at least one mixing tool (16), which can be actuated by means of a mixing tool drive device (19), preferably driven in rotation, can be displaced between at least one mixing tool use position, in which the at least one mixing tool (16) is received in the receiving space (3), and a mixing tool non-use position, in which the at least one mixing tool (16) is not in any mixing tool use position, characterized by thatthe mixing tool displacement device has or is formed by a telescopic device (15) which is preferably arranged laterally next to the mixing container (2) and / or projects upwards in the vertical axis direction, wherein the at least one mixing tool (16), preferably together with the mixing tool drive device (19), can be displaced by means of the telescopic device (15) in the telescopic axis direction between the at least one mixing tool use position and the mixing tool non-use position.

2. Construction site mixer according to claim 1, characterized in that the telescoping device (15) has at least two telescoping elements (17, 18) which can be telescoped relative to one another in the direction of the telescoping axis with respect to the telescoping device (15).

3. Construction site mixer according to claim 2, characterized in thatthe telescoping device (15) has a lower telescoping element (17) in the direction of the telescoping axis, to which at least one upper telescoping element (18) is connected, upwards in the direction of the telescoping axis, which can be displaced relative thereto, and on which the mixing tool drive device (19), preferably together with the at least one mixing tool (16) connected or connectable thereto, can be arranged or is arranged, preferably can be arranged or is arranged in such a way that the at least one mixing tool (16), in particular the free lower end of the at least one mixing tool (16), is in a predetermined raised position, preferably in the region above the upper edge (22) of the mixing container, in the extended position of the telescoping device (15), and in a mixing tool use position in the pushed-together position of the telescoping device (15).

4. Construction site mixer, in particular according to one of the preceding claims, characterized by that an upwardly open mixing container (2) is provided, which is suitable and designed to receive a mixture in its receiving space (3), that a mixing tool displacement device (15), preferably a telescopic device as the mixing tool displacement device, is provided, by means of which at least one mixing tool (16), which can be actuated by means of a mixing tool drive device (19), preferably driven in rotation, can be displaced between at least one operational mixing tool use position, in which the at least one mixing tool (16) is received in the receiving space (3) in a ready-to-use position, and a mixing tool non-use position, in which the at least one mixing tool (16) is not in an operational mixing tool use position, thata control device (44) is provided which electronically controls the activation and deactivation of the mixing tool drive device (19), that an actuating device (45) is provided by means of which the control device (44) can be activated and, if necessary, deactivated, that the control device (44) has a safety function and / or safety device (43) which is suitable and designed to enable the operation of the mixing tool drive device (19) when the actuating device (45) is activated if the at least one mixing tool (16) is in the operational mixing tool use position, or to block it if the at least one mixing tool (16) is not in the operational mixing tool use position.

5. Construction site mixer, in particular according to one of the preceding claims, characterized in thata mixing container receptacle (4) is provided which receives the mixing container (2), wherein it is preferably provided that the mixing container receptacle (4) has a, preferably flat or level, storage surface on which the mixing container (2) can be placed for its reception in the mixing container receptacle (4), and / or that the mixing container receptacle (4) has a holding device (10) which is suitable and designed to releasably hold the mixing container (2), preferably the mixing container (2 placed on the storage surface), on or in the mixing container receptacle (4), preferably releasably and force-fittingly and / or positively on or in the mixing container receptacle (4), most preferably in such a way that at least one driver element is arranged on the mixing container receptacle (4), preferably in the region of the storage surface of the mixing container receptacle (4), to form a positively locking holding device (10),which, in the use position of the mixing container (2), cooperates with at least one counter-drive element formed on the mixing container (2), preferably on an underside of the mixing container (2), preferably in the form of at least one drive tab.

6. Construction site mixer according to claim 5, characterized in that the mixing container holder (4) has a rotatably mounted receiving element (9), preferably a rotation platform or turntable with a storage area for the mixing container (2), which receives the mixing container (2) and is rotatably coupled to a mixing container drive device (6) so that the mixing container (2) can be rotated together with the receiving element (9) during the mixing process.

7. Construction site mixer according to one of claims 4 to 6, characterized in thatthe control device (44) electronically controls the activation and deactivation of the mixing container drive device (6), wherein it is preferably provided that the safety function or safety device (43) is suitable and designed to enable the operation of the mixing container drive device (6) when the actuating device (45) is activated if the at least one mixing tool (16) is in the operational mixing tool use position, or to block it if the at least one mixing tool (16) is not in the operational mixing tool use position.

8. Construction site mixer according to one of claims 4 to 7, characterized in thatthe mixing container receptacle (4) has or forms a housing and / or frame part (5) of the construction site mixing machine (1) arranged on the bottom with respect to the vertical axis direction, wherein it is preferably provided that the housing and / or frame part (5) has an elongated shape and / or is box-like and / or cuboid-like and / or movable.

9. Construction site mixer according to claim 8, characterized in that the telescopic device (15), preferably a lower telescopic element (17) of the telescopic device (15), is connected directly or indirectly to the mixing container receptacle (4) having a housing and / or frame part (5), preferably to a projection (20) of the mixing container receptacle (4) having a housing and / or frame part (5) projecting laterally beyond the rotatably mounted receptacle element (9) and projects upwards therefrom in the vertical axis direction.

10. Construction site mixer according to one of claims 3 to 9, characterized in thata positive guide device (34) is provided which is suitable and designed to block a rotation of the upper telescopic element (18) relative to the lower telescopic element (17) when the upper telescopic element (18) is lowered, preferably depending on a defined lowering path of the upper telescopic element (18), and to release a positively guided linear transfer of the at least one mixing tool (16) into the mixing tool use position, wherein it is preferably provided that the positive guide device has at least one centering blade (35) arranged on the upper telescopic element (18), preferably at least one centering blade (35) projecting from a lower end region of the upper telescopic element (18) facing the mixing container receptacle (4), which is suitable and designed to block a rotation of the upper telescopic element (18) relative to the lower telescopic element (17) when the upper telescopic element (18) is lowered, preferably depending on a defined lowering path of the upper telescopic element (18),to engage in a centering receptacle (36) on the mixing container receptacle (4) in a shape and / or contour-adapted manner and to transfer the upper telescopic element (18) non-rotatably and forcibly into the mixing tool use position.

11. Construction site mixer according to one of the preceding claims, characterized in that the telescoping device (15) has at least one, preferably elastic, prestressing element (28), preferably a gas pressure spring, by means of which the telescoping device (15) can be prestressed into the extended position and against whose prestressing force the telescoping device (15) can be displaced into a collapsed position.

12. Construction site mixer according to one of claims 3 to 11, characterized in thatthe upper telescopic element (18) in the extended position of the telescopic device (15) is rotatable or pivotable relative to the lower telescopic element (17) and in a horizontal plane about the longitudinal axis of the telescopic device (15), such that the at least one mixing tool (16) in the extended position of the telescopic device (15) can be pivoted by means of the upper telescopic element (18) in a horizontal plane lying above the upper edge (22) of the mixing container into a mixing tool insertion position, in which the at least one mixing tool (16) is located directly above the mouth opening (21) of the mixing container (2) and is prepared for transfer into the operational mixing tool use position.

13. Construction site mixer according to claim 12, characterized in thatthe at least one mixing tool (16) in the extended position of the telescoping device (15) can be pivoted by means of the upper telescoping element (18) in the horizontal plane lying above the upper edge (22) of the mixing container from the mixing tool insertion position into a filling position, such that the at least one mixing tool (16) is arranged laterally outside the mixing container (2) and / or that the mouth opening (21) of the mixing container (2) is exposed for filling.

14. Construction site mixer according to claim 12 or 13, characterized in thata pivot angle limiting device, preferably at least one stop element, is provided, by means of which the pivot angle of the upper telescopic element (18) relative to the lower telescopic element (17) and thus the two maximum pivot positions are limited, wherein it is preferably provided that a first maximum pivot position substantially corresponds to the mixing tool insertion position in which the at least one mixing tool (16) is located directly above the mouth opening (21) of the mixing container (2), and that a second maximum pivot position is a pivot position in which the at least one mixing tool (16) is arranged laterally outside the mixing container (2) and / or is pivoted outwards by at least 60°, preferably approximately by 95° or at least 90°, away from the mixing tool insertion position.

15. Construction site mixer according to one of claims 12 to 14, characterized in thata locking device (23) is provided which is suitable and designed to releasably lock a pivoting back of the upper telescopic element (18) pivoted from the mixing tool insertion position towards the filling position, depending on a predetermined pivoting path.

16. Construction site mixer according to one of claims 3 to 15, characterized in thata suction device (29) is arranged on the upper telescopic element (18), preferably in a lower region of the upper telescopic element (18) with respect to the vertical axis, by means of which suction material accumulating in the region of the mouth opening (21) of the mixing container (2) can be suctioned off, wherein it is preferably provided that the suction device (29) has a suction tube (30) which is open on both sides and / or formed by a straight pipe section, the first suction tube opening (31) of which is located in the extended position of the telescopic device (15) in the region above the upper edge (22) of the mixing container, preferably directly above the upper edge (22) of the mixing container, and / or which is oriented in the direction of the mouth opening (21) of the mixing container (2) in a suction position, and the second suction tube opening (32) of which is coupled, preferably detachably, to a suction device (33).

17. Construction site mixer according to one of claims 3 to 16, characterized in that the telescoping device (15) has a positive guide device which releases the lowering of the upper telescoping element only in the mixing tool insertion position in which the at least one mixing tool (16) is located directly above the mouth opening of the mixing container.

18. Construction site mixer according to one of the preceding claims, characterized in thata locking device (38), in particular a spring-loaded locking mechanism, is provided, by means of which the telescoping device (15) is releasably locked in the mixing tool use position of the at least one mixing tool (16), wherein it is preferably provided that the locking device (38) is releasably locked only when the at least one mixing tool (16) is in the mixing tool use position, and / or that the locking device (38) cooperates with an unlocking device, by means of which the locking of the telescoping device (15) can be released.

19. Construction site mixer according to claim 18, characterized in thatthe telescoping device (15), preferably an upper telescoping element (18) of the telescoping device (15), in the unlocked state, can be displaced, preferably substantially automatically, in the direction of the extended position by means of the elastic prestressing element (28), preferably a gas pressure spring.

20. Construction site mixer according to one of claims 4 to 19, characterized in thatthe safety function and / or safety device (43) comprises a monitoring device (47), preferably a monitoring device forming part of the mixing tool displacement device (15), which is coupled to the control device (44) in a signal-transmitting manner and is suitable and designed to detect at least the operational mixing tool use position of the at least one mixing tool (16), preferably by sensor means and / or by means of at least one switch, and to enable operation of the mixing tool drive device (19) and / or the mixing container drive device (6), when the actuating device (45) is activated, only when the at least one mixing tool (16) is in the operational mixing tool use position.

21. Construction site mixer according to claim 20, characterized in thata bridging device is provided which is coupled to the control device (44) in a signal-transmitting manner and which is suitable and designed to activate the mixing tool drive device (19) when actuated and / or when the actuating device (45) is activated, provided that the at least one mixing tool (16) is not in the operational mixing tool use position, or to block it when the at least one mixing tool (16) is in the operational mixing tool use position, so that the mixing tool drive device (19) cannot be activated in the operational mixing tool use position by means of the bridging device, wherein it is preferably provided that the bridging device has a freely accessible manual switch (59), preferably on the mixing tool drive device (19), most preferably on a handle device (54) of the mixing tool drive device (19),upon actuation of which the bridging device can be activated, preferably only when the actuating device (45) is activated., 22. Construction site mixer according to one of the preceding claims, characterized in that the telescopic device (15), preferably in the region above the at least one mixing tool (16), has a cover element (50) which is displaceable together with the at least one mixing tool (16) and, in the mixing tool use position, closes the mouth opening (21) of the mixing container (2) at least in part, preferably closes it in such a way that no finger insertion into the receiving space (3) of the mixing container (2) is possible and / or a gap is formed between the peripheral edge region of the cover element (50) and a container wall region which borders or adjoins the cover element (50) on the peripheral side.

23. Construction site mixer according to one of claims 3 to 22, characterized in thatthe mixing tool drive device (19), preferably a drive motor, is accommodated in a drive device housing (53) which is arranged on the upper telescopic element (18), preferably in the region above the mixing container receptacle (4).

24. A method for operating a construction site mixing machine (1), in particular a construction site mixing machine (1) according to one of the preceding claims, with an upwardly open mixing container (2) which is suitable and designed to receive a mixture in its receiving space (3), with a mixing tool displacement device (15) by means of which at least one mixing tool (16), which can be actuated by means of a mixing tool drive device (19), preferably driven in rotation, can be displaced between at least one mixing tool use position, in which the at least one mixing tool (16) is received in the receiving space (3), and a mixing tool non-use position, in which the at least one mixing tool (16) is not in any mixing tool use position, characterized by thatthe mixing tool displacement device (15) has or is formed by a telescopic device, preferably arranged laterally next to the mixing container (2) and / or projecting upwards in the vertical axis direction, wherein the at least one mixing tool (16), preferably together with the mixing tool drive device (19), can be displaced by means of the telescopic device in the telescopic axis direction between the at least one mixing tool use position and the mixing tool non-use position, and / or thata control device (44) which electronically controls the activation and deactivation of the mixing tool drive device (19), and an actuating device (45) by means of which the control device (44) can be activated and, if necessary, deactivated, are provided, wherein the control device (44) has a safety function and / or a safety device (43) which enables the operation of the mixing tool drive device (19) when the actuating device (45) is activated if the at least one mixing tool (16) is in the operational mixing tool use position, or blocks it if the at least one mixing tool (16) is not in the operational mixing tool use position.

Images