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

Abstract

The invention relates to a construction site mixer (1) for mixing materials, in particular for mixing plasters, screeds, concrete, mortars, slurries, or resins, comprising a mixing container (2) for a mixture, with an upwardly open mixing container (2) that is suitable and designed to receive a mixture in its receiving space (3). Furthermore, at least one mixing tool (16) is provided, which can be rotatably driven by means of a mixing tool drive device (19), wherein the at least one mixing tool (16) is suitable and designed to be received in a mixing tool operating position in the receiving space (3), preferably by means of a mixing tool repositioning device (15). A rotatably mounted mixing container holder (4) is also provided, which receives the mixing container (2) and can be rotatably driven by a mixing container drive device (6), so that the mixing container (2) can be rotated during a mixing process.A control unit (44) electronically controls the activation and deactivation of the mixing tool drive unit (19) and the mixing container drive unit (6). The control unit (44) is configured to drive the mixing container (2) by means of the mixing container drive unit (6) in the opposite direction to the at least one mixing tool (16), which is rotatably driven by means of the mixing tool drive unit (19). Alternatively or additionally, the control unit (44) has a timer function by means of which the operating time of the mixing tool drive unit (19) and / or the mixing container drive unit (6) can be set and / or controlled.

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 plaster, screed, concrete, mortar, slurries, or resins. The mixing machine has an upwardly open mixing container that is suitable and designed to receive a mixed material in its receiving space. Furthermore, the construction site mixing machine comprises at least one mixing tool that can be driven in rotation by means of a mixing tool drive device, wherein the at least one mixing tool is suitable and designed to be received in a mixing tool use position in the receiving space, preferably by displacement by means of a mixing tool displacement device. Furthermore, a rotatably mounted mixing container receptacle is provided, which receives the mixing container and can be driven in rotation by a mixing container drive device, so that the mixing container can be rotated during a mixing process.A control device electronically controls the activation and deactivation of the mixing tool drive device and the mixing container drive device.

[0007] According to a first aspect of the invention, the control device is configured to drive the mixing container by means of the mixing container drive device in the opposite direction, preferably exclusively in the opposite direction, to the at least one mixing tool that can be driven by the mixing tool drive device. For example, the at least one mixing tool can be driven clockwise and the mixing container in the opposite direction, i.e., counterclockwise. Alternatively, the at least one mixing tool can be driven counterclockwise and the mixing container clockwise. This expressly also includes movement patterns in which the counter-rotating movement is supplemented by oscillating movements or movements with varying speeds, while maintaining the basic requirement of the counter-rotating direction.The advantage of counter-rotating the mixing vessel is that the speed of the mixing tool remains constant, ensuring a stable and efficient mixing process. In such cases, i.e., when the drives are running in the same direction, the mixing vessel can already be driven forward by the mixing tool drive unit, causing the mixing vessel drive unit to fluctuate between "braking" and "driving."

[0008] Even if purely counter-rotating rotation is preferred, the control device can in principle also be configured to additionally enable co-rotating rotation between the mixing container and mixing tool drive units. This can be done intermittently or at intervals, for example, with counter-rotating rotation for a first period of time and then co-rotating rotation for a second period of time. This pattern can then be repeated identically for a predetermined mixing time, with variations in the duration of the periods and / or the drive speeds being possible within the pattern. This offers the advantage of being able to flexibly adapt the construction site mixer to different mixing requirements and mixing materials, i.e. with either counter-rotating or co-rotating rotation of the two drives.The possibility of providing different directions of rotation makes the construction site mixer according to the invention universally applicable and increases its versatility in different application scenarios.

[0009] According to a second aspect of the invention, which is alternative to or additional to the first aspect of the invention, the control device can have a timer function by means of which the operating time of the mixing tool drive device and / or the mixing container drive device can be adjusted and / or controlled. Such a control device enables precise electronic control of the drive devices and contributes to adapting the mixing process to specific requirements. This leads to a precisely controllable mixing process, which can improve both the quality of the end product and the efficiency of the mixing process. Furthermore, the timer function reduces manual intervention by the operator and thus minimizes the risk of operating errors.

[0010] While the two aspects of the invention can be used independently of one another, their combination also offers a synergy that optimizes the mixing process in terms of both efficiency and precision: This synergy arises in particular from the fact that the counter-rotating rotation of the drive units makes the mixing process efficient, while the timer function precisely limits the mixing process. This combination minimizes operating errors, reduces manual intervention, and increases overall productivity. This synergy is particularly beneficial for mixes that require a defined processing time, such as reactive resins or specialty mortars.

[0011] The electronic 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 mixing tool drive device and the mixing container drive device. The preferably programmable control device can also generally comprise a control panel with switches, buttons, and / or a display that allows the operator to monitor the operating status and, if desired, also control the construction site mixer. This can include, for example, setting the mixing speed, start / stop functions, and, of course, other desired parameters.

[0012] According to a particularly preferred specific embodiment, the control device is configured to drive the mixing container by means of the mixing container drive device at least temporarily, preferably at a speed of approximately 5 to 40 min -1< , most preferably from approximately 8 to 35 min -1< , in a first direction of rotation and / or to drive the at least one mixing tool by means of the mixing tool drive device at least temporarily, preferably at a speed of 250 to 900 min -1< , most preferably from 300 to 800 min -1< , in a second direction of rotation opposite to the first direction of rotation. A speed of the mixing container in the range of approximately 5 to 40 min -1< , preferably from approximately 8 to 35 min -1< , enables adaptation to different mixing materials and uniform rotation of the mixing container, whereby spillage of the mixing material is reliably prevented - even at high speeds of the mixing tool.This achieves a homogeneous mix and increases the efficiency of the mixing process. A preferred speed of the at least one mixing tool of approximately 250 to 900 min -1< , more preferably of approximately 300 to 800 min -1< , generates sufficiently high shear forces to mix or homogenize both liquid and viscous mixes effectively and without the formation of lumps. This range enables the processing of various materials, from free-flowing to highly viscous substances such as concrete or resins. A particular advantage lies in the combination of the two speed ranges mentioned: The relatively low speed of the mixing container ensures even distribution of the mix in the container, while the higher speed of the mixing tool takes care of intensive mixing.The combination of these speeds ensures an optimal balance between the movement of the entire mix and local mixing, ensuring a homogeneous result. In addition, the counter-rotating direction of rotation creates additional relative speed between the mix and the mixing tool, which enhances the mixing effect without having to further increase the speed.

[0013] The control device preferably also includes a performance monitoring device that is suitable and configured to monitor the performance of the mixing container drive device. This includes, for example, measuring power consumption, torque, or similar parameters to ensure optimal control and protection of the mixing container drive device.

[0014] According to another particularly preferred embodiment, an actuating device is provided by means of which the control device can be activated and, if necessary, deactivated. Such an actuating device enables simple and preferably intuitive operation of the construction site mixer, for example, in that the control device can be quickly activated or deactivated using a manual and / or throttle switch as an actuating device or as part of the actuating device. The actuating device can be designed differently depending on the variant and, for example, can be implemented as a system with multiple operating elements, such as switches or buttons, which are coupled to the control device and / or to one another and interact with each other.Alternatively, the actuating device may also be formed by a single operating element, such as an accelerator switch, which enables the activation and / or deactivation of the control device.

[0015] In a particularly preferred embodiment, the actuating device can thus comprise an accelerator switch or be formed by an accelerator switch which, for example, is preferably designed as an ergonomic hand switch. Accordingly, according to a preferred embodiment, the actuating device comprises an accelerator switch as a hand switch or is formed by an accelerator switch designed as a hand switch. It is typically located in the region of a handle of the mixing machine and can be manually actuated by pushing or pulling, preferably by pushing. Alternatively, the accelerator switch can in principle also be arranged elsewhere on the construction site mixing machine as a separate operating element. According to a particularly preferred specific embodiment, the accelerator switch is suitable and designed to activate the mixing tool drive device and / or to regulate its speed.In a particularly preferred embodiment, the accelerator switch enables continuous control of the mixing speed, for example, by increasing pressure on the accelerator switch. Additionally, the accelerator switch can also have a mechanical locking function to activate continuous operation.

[0016] In another particularly preferred embodiment, the actuating device additionally comprises a mechanical actuating lever that interacts with the accelerator switch. The actuating lever is suitable and configured to mechanically actuate the accelerator switch depending on the position of the mixing tool, preferably such that a continuous operation mode of the mixing tool drive device is set and / or activated upon reaching the operational mixing tool use position. Accordingly, according to a particularly preferred embodiment, the actuating lever is suitable and configured to mechanically actuate the accelerator switch (only) upon reaching the operational mixing tool use position.This mechanical actuation then enables reliable and continuous activation of the mixing tool drive unit and thus a continuous operation mode, for example, with the accelerator switch pressed to its maximum position and thus at maximum speed of the mixing tool. The mechanical actuation lever contributes to the safety of the construction site mixer by ensuring that the continuous operation mode is only activated when the mixing tool is in the correct position.

[0017] According to a preferred specific embodiment, the actuating lever can be arranged, for example, on a mixing tool displacement device described in more detail below, in particular on the upper telescopic element, wherein the actuating lever is assigned a stop element on the mixing tool displacement device, in particular on a lower telescopic element, against which the actuating lever comes into a stop when the mixing tool is displaced into the mixing tool use position after a defined displacement path, so that the actuating lever is actuated, in particular pivoted, upon further displacement of the mixing tool into the mixing tool use position and actuates the accelerator switch.In an exemplary and particularly preferred embodiment, the actuating lever acts, on the one hand, preferably directly, on the accelerator switch, while on the other hand a preferably mechanical stop element is provided, preferably in the region of the mixing tool displacement device described in more detail below, in particular on the lower telescopic element, which causes the actuating lever to initially come into contact with the stop element after a defined displacement path when the mixing tool is moved into the mixing tool use position. As a result, during further displacement of the mixing tool in the direction of the mixing tool use position, the actuating lever is then actuated, preferably pivoted, in such a way that it acts on the accelerator switch and actuates it. The mechanical actuation of the accelerator switch ensures that the continuous operation mode is only activated in the correct position.The operating lever and / or the accelerator switch can also be optionally equipped with a return spring, which ensures that the operating lever or the switch is automatically returned to the rest and starting position when the mixing tool is moved from the ready-to-use mixing tool position.

[0018] According to another particularly preferred embodiment, the control device, the mixing tool, and the mixing tool drive device are components of a hand mixer. Such a hand mixer, which is generally known in the art, is a portable, motor-driven device specifically designed and manufactured for mixing and preparing mixed materials such as mortar, concrete, screed, or similar materials. Unlike kitchen appliances, which are designed for food processing, a hand mixer is designed for use in demanding environments such as construction sites or workshops. It is characterized by a robust construction that meets the requirements of construction and craft materials and has a mixing tool drive device designed for high torques to efficiently process viscous or heavy mixed materials.The mixing tool, usually in the form of a stirring rod or whisk, is optimized for direct use in larger containers and can usually be interchanged to meet different mixing requirements. Furthermore, a hand mixer is manually operated and usually offers ergonomic handles and intuitive controls to ensure comfortable and safe handling.

[0019] Accordingly, in a particularly preferred embodiment, the hand mixer of the present construction site mixer also comprises a handle device and a drive device housing in which the mixing tool drive device, preferably a drive motor, is accommodated. Such a configuration allows for further optional configurations: For example, an actuating element, e.g., a handset, preferably arranged on the handle device, allows the operator to actuate or operate the mixing tool drive device in a manner familiar and thus habitual from conventional hand mixers. The handle device also enables the operator to easily move the at least one mixing tool into the desired positions by means of a displacement device, preferably present or provided on the construction site mixer, which displacement device can, for example, be formed by a telescopic device.Particularly advantageous in this context is an embodiment in which, alternatively or additionally, the handle device comprises two, preferably approximately U-shaped, handle elements located transversely to the vertical axis on opposite sides of the drive device housing, preferably each with at least one handle spaced apart from the drive device housing. Such a specific configuration thus not only enables an arrangement of the actuating element on the handle device that is familiar to the operator from conventional hand mixers, for example in the form of a hand switch, but also particularly advantageous two-hand operation when transferring the at least one mixing tool into the respectively desired mixing tool position.

[0020] The hand mixer can also be fixedly and permanently attached to the construction site mixer, preferably to a mixing tool relocation device described in more detail below. In this embodiment, the hand mixer then forms an integral part of the construction site mixer or of a mixing tool relocation device. According to a particularly preferred embodiment, however, the hand mixer is preferably formed by a separate component that is detachably attached to the construction site mixer, preferably to a mixing tool relocation device described in more detail below. This allows the hand mixer to advantageously also be used separately and independently of the construction site mixer, which significantly increases the flexibility with regard to the use of such devices.

[0021] In principle, the control device and, if present or provided, also an actuating device can of course also be arranged at any other suitable location on the construction site mixer, which will also be explained in more detail below.

[0022] According to a further particularly preferred embodiment, the control device comprises a timer device with a timer function, which is suitable and designed to count down an adjustable and / or predeterminable time period and, after this time period has elapsed, to automatically deactivate the mixing tool drive device and / or the mixing container drive device. The automatic deactivation of the mixing tool and / or mixing container drive device after an adjustable and / or predeterminable time period has elapsed allows for precise control of the mixing process, which is particularly important for mixed materials with specific processing times. This prevents both overmixing and undermixing, thereby improving the quality of the mixed material. Furthermore, the timer function reduces manual intervention by the operator and thus minimizes the risk of operating errors.This not only leads to greater workflow efficiency but also increases safety, as the mixing process is automatically stopped after the specified time has elapsed. Furthermore, the timer function allows for flexible adaptation to different mixing requirements and material properties. This functionality is particularly advantageous for mixes that must be processed within defined time frames, such as reactive resins or specialty mortars.

[0023] Furthermore, it can preferably be provided that the control device, preferably the timer 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. The operating time of the mixing tool drive device and / or the mixing container drive device can be set in various stages or continuously. Such a configuration enables a time-efficient and automated operation and is particularly advantageous when the material to be mixed must only be mixed over a defined period of time in order to achieve optimal results.

[0024] According to a particularly preferred specific embodiment, it is also provided that the control device is configured to activate the mixing tool drive device and the mixing container drive device simultaneously or with a time delay, and to deactivate them if necessary. An embodiment is particularly preferred in this case in which the control device is configured 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.

[0025] According to a further particularly preferred embodiment, the control device comprises a safety function and / or safety device that is suitable and configured to enable the operation of the mixing container drive device and / or the mixing tool drive device, preferably when the actuating device is activated, when the at least one mixing tool is in the ready-to-use mixing tool position, and / or to block or deactivate it when the at least one mixing tool is or is no longer in the ready-to-use mixing tool position. The latter can also be provided, in particular, for the case where an actuating element or an actuating device is actuated, for example, by means of a manual and / or accelerator switch.This can specifically mean, for example, that the mixing container drive device and / or the mixing tool drive device is only switched on or activated when the at least one mixing tool is in the desired operational mixing tool operating position in which the mixing tool is received in the mixing container in the desired manner and / or that the mixing container drive device and / or the mixing tool drive device is automatically stopped when the at least one mixing tool is moved out of this operational mixing tool use position.A safety function and / or safety device equipped in this way ensures safe operation of the mixing tool drive unit and the mixing container drive unit and offers a variety of advantages: It detects the correct position of the mixing tool and can, for example, ensure that the mixing tool drive unit can only be operated in the ready-to-use position. Similarly, it can optionally be ensured that the mixing container drive unit is only activated when the mixing tool is correctly positioned. This prevents accidents and damage that could occur if the mixing container is rotated with an improperly positioned mixing tool and ensures that the entire mixing process only starts when all components are correctly aligned and secured.

[0026] The safety function and / or safety device can be implemented through a variety of technical measures, which can be both mechanical and electronic in nature. 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. Alternatively or additionally, a safety switch can be provided that 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 of the mixing tool and / or mixing container drive device when the correct positions are reached.

[0027] Finally, the safety function can be implemented alternatively or additionally in a programmable logic controller that considers various conditions and logic to safely enable, disable, or shut down operation. These measures, which can be used individually or in combination, create physical and / or software-based interlocks that ensure that operation only occurs under safe conditions and that all relevant safety standards are met.

[0028] According to a particularly advantageous specific embodiment, which contributes significantly to increasing the operational safety of the construction site mixer in the aforementioned sense, it can be provided that the safety function and / or safety device is formed by a monitoring device or that the above-described safety function and / or safety device has a monitoring device. This monitoring device is coupled to the control device in a signal-transmitting manner and is optionally orPreferably, it 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 means of a sensor and / or at least one switch, and to enable the operation of the mixing tool drive device and / or the mixing container drive device, preferably when the actuating device is activated, for example only when the at least one mixing tool is in the operational mixing tool use position, or to stop it when the at least one mixing tool is no longer in the operational mixing tool use position. Alternatively or additionally, according to a further embodiment, for example as or in conjunction with a bridging device, it can also be provided that at least the mixing tool drive device can be activated before the operational mixing tool use position is reached, i.e.for example, before the mixing tool displacement device is moved downwards. This activation can be achieved, for example, via a manual and / or throttle switch. In this way, the mixing tool can be immersed in the mix during the downward movement while it is already rotating. In this case, a safety function can be provided, for example, that the mixing container drive device can only be activated after the mixing tool has reached the operational position.

[0029] 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.

[0030] According to a particularly preferred specific embodiment of the present inventive concept, the monitoring device is a component of a mixing tool displacement device described in more detail below, for example, a telescoping device as a mixing tool displacement device, as will also be described in more detail below. In particular, with such a mixing tool displacement device, the respective position of the at least one mixing tool can be monitored particularly easily depending on the position of the elements that can be displaced relative to one another.

[0031] For example, according to a specific embodiment, it can advantageously be provided that 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 in turn be provided that the safety switch is deactivated in the operational mixing tool use position of the at least one mixing tool, for example in a retracted telescopic device as a mixing tool displacement device, so that the operation of the mixing tool drive device and / or the mixing container drive device is enabled or fundamentally enabled. The control device can then, preferably with the actuating device (e.g.formed by a manual switch), the mixing tool drive device and / or the mixing container drive device can be controlled or activated in the desired, preferably programmed, manner. Furthermore, the safety switch is activated in the non-operational mixing tool use position of the at least one mixing tool, for example, with the telescoping device at least partially extended as a mixing tool displacement device, so that the operation of the mixing tool drive device and / or the mixing container drive device is blocked or stopped. In this state, the control device preferably blocks or stops the actuation of the mixing tool drive device and / or the mixing container drive device - even if an actuating device, such as a manual and / or accelerator switch, is activated.

[0032] As already mentioned several times above, the construction site mixing machine preferably comprises a mixing tool displacement device, by means of which the at least one mixing tool, which can be driven in rotation by means of the mixing tool drive device, 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.It is preferably 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] According to another 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 the 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. Particularly with counter-rotating mixing of the mixing container and mixing tool, this achieves particularly homogeneous and even mixing of the materials.

[0037] According to another particularly preferred specific embodiment, the rotatably mounted receiving element has a preferably flat or level support surface on which the mixing container can be placed for its reception in the mixing container holder. The support surface, in particular a flat or level support 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 support surface, which leads to simplified handling and rapid readiness of the mixing machine. In particular, the flat or level support 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.

[0038] 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 the manner of a bracket, which are arranged, for example, at a distance from one another around the storage surface and clamp a lower edge region of the mixing container between them.

[0039] Alternatively or in addition to such a force- or friction-locking holding device, a form-locking holding device can be provided according to a particularly preferred embodiment, 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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, toward the extended position by means of the elastic pretensioning element, preferably a gas spring. This ensures in a simple manner that the telescoping device returns to the desired position, namely the extended position, in which the at least one mixing tool can be easily and reliably displaced away from the mixing container by means of the upper telescoping element, which can be pivoted horizontally about the lower telescoping element.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] As already explained above by way of example in connection with the optional provision of a hand mixer, according to a further particularly preferred embodiment, it can be provided that the mixing tool drive device, preferably a drive motor, is accommodated in a drive device housing which is detachably or permanently arranged or held 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, e.g. of a hand mixer, ensures, on the one hand, that the mixing tool drive device is reliably protected from environmental influences such as dust, moisture or other potential contamination that can occur on a construction site. Furthermore, it contributes to extending the service life of the drive device and reducing maintenance costs.This also contributes to occupational safety, especially when operators are near the mixer. Furthermore, integrating the mixing tool drive unit into a drive unit housing on the upper telescopic element allows for an aesthetically pleasing design.

[0064] 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.

[0065] 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.

[0066] Furthermore, the 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. In this way, the handle element can also form a fall protection element in a particularly advantageous dual function, preventing the control device from being damaged if the construction site mixer falls over.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] The invention is explained in more detail below with reference to a drawing.

[0073] 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 Figure 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 . Fig. 13 a schematic and perspective bottom view of a portion of an alternative construction site mixer, in which a throttle switch is coupled to a part of an operating lever extending outside the upper telescopic element, Fig. 14 a schematic and perspective side view of the Figure 13 , Fig.15 a schematic detailed representation of the part of the actuating lever running inside the upper telescopic element together with an associated stop element and a sensor device.

[0074] In the Figure 1a 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.

[0075] 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.

[0076] 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.

[0077] As can be seen from the Figure 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.

[0078] 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 Figure 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.

[0079] 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.

[0080] The housing part 5 and thus the mixing container holder 4 also has, by way of example only, the Figure 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.

[0081] 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.

[0082] As can be seen from the Figure 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 Figure 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 Figure 1 and 2 shown mixing tool non-use position, in which the mixing tool 16 is not in the operational mixing tool use position.

[0083] 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°.

[0084] 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.

[0085] 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 Figure 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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 Figure 6a , 6b and 6c shown ready-to-use mixing tool position can be transferred.

[0091] 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 outlet 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.

[0092] 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.

[0093] As this can be seen very well from the Figure 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.

[0094] 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.

[0095] 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.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] The construction site mixer 1 according to the invention further comprises an electronic control device 44 which electronically controls the activation and deactivation of the mixing tool drive device 19, wherein the control device 44 is coupled here, for example, 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 is clearly visible, which each show perspective top views of the construction site mixer 1, the actuating device 45 is here, for example, coupled to or has 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.

[0101] 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 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 Figure 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. This expressly also includes the case in which operation is stopped when the mixing tool 16 is moved out of the operational mixing tool use position.

[0102] For this purpose, the safety device 43, as shown only very schematically and by way of example in the Figure 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 Figure 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.

[0103] If the upper telescopic element 18 is now moved as shown in the Figure 7ashown, is displaced upwards relative to the lower telescopic 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, which will be explained below in connection with the Figures 13 to 15 is explained in more detail.

[0104] 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, but in opposite directions, ie in different directions of rotation, when the main switch 46 is switched on and / or the actuating device 45 is activated, that is to say that both the mixing container 2 and the mixing tool 16 are driven in different directions of rotation by means of their respective drive devices, for example the mixing container 4 is driven in a first direction of rotation 69 and the mixing tool 16 is driven in a second, opposite or counter-rotating direction of rotation 70 (see Figure 1). The mixing container 4 can be driven by means of the mixing container drive device 6 at a speed of approximately 5 to 40 min -1< , preferably of approximately 8 to 35 min -1< , in the first direction of rotation 69 and the mixing tool 16 can be driven by means of the mixing tool drive device 19 at a speed of 250 to 900 min -1< , preferably of 300 to 800 min -1< , in the second direction of rotation 70 opposite to the first direction of rotation 69.

[0105] In the exemplary embodiment illustrated here, the control device 44 further preferably has a timer function by means of which the operating time of the mixing tool drive device 19 and the mixing container drive device 6 can be set and / or controlled. Specifically, the control device 44 has, for example, a timer device with a timer function that is suitable and designed to count down an adjustable and / or predeterminable time period and, after this time period has elapsed, to automatically deactivate the mixing tool drive device 19 and the mixing container drive device 6. The control device 44 can preferably be 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.

[0106] The safety device 43 or the safety switch 47 can, for example, ensure that the operation of the mixing container drive device 6 and / or 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.

[0107] 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 Figure 1 and 6ccan 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.

[0108] 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 Figure 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.

[0109] 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.

[0110] 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.

[0111] 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.

[0112] 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 can form a bridging device or be a component of a bridging device, wherein it can preferably and optionally be provided that the bridging device is coupled to the control device 44 in such a way that the mixing tool drive device 19 can be activated upon actuation of the manual switch 59 for driving the mixing tool 16 even when the at least one mixing tool 16 is not in the ready-to-use mixing tool position. In this way, the mixing tool 16 can rotate and immerse itself in the material to be mixed during its downward movement.

[0113] As this further emerges from the Figure 5As can be seen, the control device 44 can be coupled to a time selection switch 60, 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 of 15 seconds to 10 minutes, preferably of 0.5 minutes to 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.

[0114] As this is particularly evident from the overview of Figure 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 rests 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.

[0115] Alternatively, the control device 44 can also, as in the Figure 1shown in dashed lines, together with the mixing tool 16 and the mixing tool drive device 19, can be part of a hand mixer 71 which has the handle device 54 and the drive device housing 53 and which, in a particularly preferred embodiment, forms a separate component which is detachably mounted on the construction site mixer 1 or, in the specific example shown here, on the upper telescopic element 18 of the telescopic element 15 as a mixing tool displacement device. As a result, the hand mixer 71 can advantageously also be used separately and independently of the construction site mixer 1. In this embodiment variant, the actuating device 45 can then have, in the example shown here, in addition to the main switch 46, an accelerator switch formed by the hand switch 59, which is arranged on the handle device 54.In this embodiment, a time selection device can also be provided, by means of which at least the operating time of the mixing tool drive device 19, and possibly also of the mixing container drive device 6, can be specified. The input can then be made, for example, via a display 72 (shown in dashed lines in the . Figure 5 ) take place.

[0116] As can be seen in particular from the figures showing an alternative embodiment Figures 13 to 15As can be seen, the actuating device 45 in the embodiment shown here can comprise an accelerator switch, which here is, for example, preferably formed by the hand switch 59. It is typically located in the region of a handle of the mixing machine 1, here, for example, in the region of the handle 58, and can be manually actuated by pressure. Via this accelerator switch 59, for example, the mixing tool drive device 19 can be activated and its speed regulated, for example by increasing pressure on the accelerator switch.

[0117] The actuating device 45 additionally comprises a mechanical actuating lever 73 which interacts with the accelerator switch 59 in such a way that a continuous running mode of the mixing tool drive device 19 is set and / or activated when the ready-to-use mixing tool position is reached.

[0118] In the example shown, the actuating lever 73 is arranged on the upper telescopic element 18, wherein the actuating lever 73 or a part of the actuating lever 73 running inside the upper telescopic element 18 is assigned a stop element 74 on the lower telescopic element 17, against which the actuating lever 73 comes into a stop when the mixing tool 16 is moved into the mixing tool use position after a defined displacement path (see Figure 15), so that the actuating lever 73, upon further displacement of the mixing tool 16 into the mixing tool usage position, is pivoted by means of the pivotable bearing 75 on the upper telescopic element 18 and the actuating lever 73 or preferably a part of the actuating lever 73 running outside the upper telescopic element 18 actuates or presses the accelerator switch 59. In the embodiment shown here, the actuating lever 73 acts directly on the accelerator switch 59. The mechanical actuation of the accelerator switch ensures that the continuous operation mode is only activated in the correct position, i.e. in the operational mixing tool usage position. The actuating lever 73 and the accelerator switch 59 can also optionally be equipped with a return spring, which ensures that the actuating lever orthe switch is then automatically moved back to the rest and starting position when the mixing tool is moved again from the ready-to-use mixing tool position, whereby at least the operation of the mixing tool drive device 19 is then preferably stopped.

[0119] In the Figure 15Also shown schematically is an alternative embodiment of the safety device 43, which here is designed as a sensor and has a sensor device 76 that is connected to the control device 44 for signal transmission. The sensor device 76 comprises a first sensor element 77, which is arranged on the upper telescopic element 18, and a second sensor element 78, which is arranged on the lower telescopic element 17. The two sensor elements 77 and 78 work together and detect whether the mixing tool 16 is in the ready-to-use mixing tool position. Only when the mixing tool 16 has reached this position is a corresponding signal sent from the sensor device 76 to the control device 44. This signal activates the sensor device 76, thereby enabling operation of both the mixing tool drive device 19 and the mixing container drive device 6.However, if the mixing tool 16 is not in the ready-to-use position, the sensor device 76 remains deactivated. This blocks the operation of both the mixing tool drive device 19 and the mixing container drive device 6. The sensor device 76 can be formed, for example, by inductive proximity sensors, Hall-effect sensors, or optical sensors.

[0120] As this further shows very well from the Figure 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.

[0121] The cable or line routing is preferably protected on or within the telescopic device 15 and the mixing container holder 4.

[0122] 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.

[0123] As in the Figure 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. Reference symbol list

[0124] 1 Construction site mixer 2 Mixing container 3 Storage space 4 Mixing container holder 5 Housing 6 Mixing container drive unit / drive motor 7 Chain 8 Rotating axis 9 Receptacle / 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 unit / drive motor 20 Overhang 21 Outlet opening 22 Mixing container upper edge 23 Locking device 24 Latching element 25 Counter-latching element 26 Actuating element 27 Arrow 28 Gas pressure spring / pre-tensioning element 29 Extraction device 30 Extraction pipe 31 First extraction pipe opening 32 Second extraction pipe opening 33Suction device 34Forced guidance device 35Centering blade 36Centering mount 37Arrow 38Locking device 39Locking element 40Locking counter element 41Lever 42Arrow 43Safety device 44Control device 45Actuating device 46Main switch 47Safety switch / monitoring device 48aSwitch element 48 bCounter contact element 49Groove recess 50Cover element / cover plate 51Connecting part 52Edge wiper 53Drive device housing 54Handle device 55Handle element 56Handle element 57Handle 58Handle 59Hand switch / accelerator switch 60Time selector switch 61Handle element 62Cable connection / power connection 63Contact element 64Contact element 65Contact element 66Counter contact element 67Drive element 68Drive counter element 69First direction of rotation 70Second direction of rotation 71Hand stirrer 72Display 73Operating lever 74Stop element 76Sensor device 77First sensor element 78Second sensor element

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 at least one mixing tool (16) which is rotatably driven by means of a mixing tool drive device (19), wherein the at least one mixing tool (16) is suitable and designed to be received in a mixing tool use position in the receiving space (3), preferably by displacement by means of a mixing tool displacement device (15), with a rotatably mounted mixing container holder (4) which receives the mixing container (2) and is rotatably driven by a mixing container drive device (6) so that the mixing container (2) is rotatable during a mixing process, with a control device (44),which electronically controls the activation and deactivation of the mixing tool drive device (19) and the mixing container drive device (6), , characterized by that the control device (44) is configured to drive the mixing container (2) by means of the mixing container drive device (6) in the opposite direction to the at least one mixing tool (16) that can be driven in rotation by means of the mixing tool drive device (19) and / or that the control device (44) has a timer function by means of which the operating time of the mixing tool drive device (19) and / or the mixing container drive device (6) can be set and / or controlled.

2. Construction site mixer according to claim 1, characterized in that the control device (44) is configured to drive the mixing container (2) by means of the mixing container drive device (6) at least temporarily, preferably at a speed of 5 to 40 min -1 , most preferably from 8 to 35 min -1, in a first direction of rotation and / or to drive the at least one mixing tool (16) by means of the mixing tool drive device (19) at least temporarily, preferably at a speed of 250 to 950 min -1 , most preferably from 300 to 800 min -1 , in a second direction of rotation opposite to the first direction of rotation.

3. Construction site mixer according to claim 1 or 2, characterized in that an actuating device (45) is provided by means of which the control device (44) can be activated and, if necessary, deactivated.

4. Construction site mixer according to one of the preceding claims, characterized in thatthe control device (44), the mixing tool (16) and the mixing tool drive device (19) are components of a hand mixer (71) which has a handle device (54) and a drive device housing (53) in which the mixing tool drive device (19), preferably a drive motor, is accommodated, wherein it is preferably provided that the hand mixer is a separate component which is detachably mounted on the construction site mixing machine (1), preferably on a mixing tool displacement device.

5. Construction site mixer according to claim 3 and 4, characterized in that the actuating device (45), preferably a hand switch, is arranged on the handle device (54).

6. Construction site mixer according to claim 4 or 5, characterized in that the actuating device (45) comprises an accelerator switch (59) as a manual switch or is formed by an accelerator switch (59) designed as a manual switch.

7. Construction site mixer claim 6, characterized in that the actuating device (45) additionally comprises a mechanical actuating lever (73) which cooperates with the accelerator switch (59), wherein the actuating lever (73) is suitable and designed to mechanically actuate the accelerator switch (59) depending on the position of the mixing tool (16), preferably in such a way that a continuous running mode of the mixing tool drive device is set and / or activated upon reaching the operational mixing tool use position.

8. Construction site mixer according to claim 7, characterized by that the actuating lever (73) is arranged on the mixing tool displacement device (15), in particular on an upper telescopic element (18), and thatthe actuating lever (73) is assigned a stop element (74) on the mixing tool displacement device (15), in particular on a lower telescopic element (17), against which the actuating lever (73) comes into abutment upon displacement of the mixing tool (16) into the mixing tool use position after a defined displacement path, so that the actuating lever (73) is actuated, in particular pivoted, upon further displacement of the mixing tool (16) into the mixing tool use position and actuates the accelerator switch (59).

9. Construction site mixer according to one of the preceding claims, characterized in that the control device (44) comprises a timer device with a timer function which is suitable and designed to count down an adjustable and / or predeterminable time period and to automatically deactivate the mixing tool drive device (19) and / or the mixing container drive device (6) after the expiry of this time period.

10. Construction site mixer according to one of the preceding claims, characterized in that the control device (44), preferably a timer device of the control device (44), is coupled to a time selection device, preferably to a time selection switch (60), by means of which the operating time of the mixing tool drive device (19) and / or the mixing container drive device (6) can be predetermined.

11. Construction site mixer according to one of the preceding claims, characterized in that the control device (44) is configured to activate and, if necessary, deactivate the mixing tool drive device (19) and the mixing container drive device (6) simultaneously or with a time delay, wherein it is preferably provided that the control device (44) is configured to activate the mixing tool drive device (19) before the mixing container drive device (6).

12. Construction site mixer according to one of the preceding claims, characterized in 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 container drive device (6) and / or the mixing tool drive device (19), preferably when the actuating device (45) is activated, when the at least one mixing tool (16) is in the ready-to-use mixing tool position, or to block or stop it when the at least one mixing tool (16) is not in the ready-to-use mixing tool position.

13. Construction site mixer according to claim 12, characterized in thatthe safety function and / or safety device (43) comprises a monitoring device (47), preferably a monitoring device forming part of a mixing tool displacement device (15), which is coupled to the control device (44) in a signal-transmitting manner, wherein it is preferably provided that the monitoring device (47) 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 the operation of the mixing tool drive device (19) and / or the mixing container drive device (6) when the at least one mixing tool (16) is in the operational mixing tool use position and / or to stop it when the at least one mixing tool (16) is not or is no longer in the operational mixing tool use position.

14. Construction site mixer according to one of the preceding claims, characterized in that a mixing tool displacement device is provided, by means of which the at least one mixing tool (16) which can be driven in rotation by means of the mixing tool drive device (19) can be displaced between at least one mixing tool use position, in which the at least one mixing tool (16) is accommodated 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.

15. Construction site mixer according to claim 14, characterized in 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.

16. Construction site mixer according to one of the preceding claims, characterized in that the mixing container holder (4) has a rotatably mounted holder element (9), preferably a rotation platform or turntable with a storage surface for the mixing container (2), which receives the mixing container (2) and is coupled to the mixing container drive device (6) in a rotationally drivable manner.

17. Construction site mixer according to one of the preceding claims, characterized in thatthe rotatably mounted receiving element (9) 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 hold the mixing container (2), preferably the mixing container (2 placed on the storage surface), detachably on or on the mixing container receptacle (4), preferably detachably and force-fittingly and / or positively on or on the mixing container receptacle (4), most preferably in such a way that, in order to form a positively locking holding device (10), 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), which driver element, in the use position of the mixing container (2), is connected to at least one on the mixing container (2), preferably on an underside of the mixing container (2),formed driver counter element, preferably in the form of at least one driver tab., 18. Construction site mixer according to one of the preceding claims, characterized in that the 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.

19. 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 at least one mixing tool (16) which is rotatably driven by means of a mixing tool drive device (19), wherein the at least one mixing tool (16) is suitable and designed to be received in a mixing tool use position in the receiving space (3), preferably by displacement by means of a mixing tool displacement device (15), with a rotatably mounted mixing container holder (4) which receives the mixing container (2) and is rotatably driven by a mixing container drive device (6), so that the mixing container (2) is rotatable during a mixing process, with a control device (44),which electronically controls the activation and deactivation of the mixing tool drive device (19) and the mixing container drive device (6), , characterized by that the control device (44) is configured to drive the mixing container (2) by means of the mixing container drive device (6) in the opposite direction to the at least one mixing tool (16) which can be driven in rotation by means of the mixing tool drive device (19) and / or that the control device (44) has a timer function by means of which the operating time of the mixing tool drive device (19) and / or the mixing container drive device (6) can be set and / or controlled.

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