Lifting device

Abstract

A lifting device (1) for collection vehicles for emptying containers (8) has a lifting motor coupled to an articulated quadrant (2) mounted on the collection vehicle, wherein the container (8) can be raised from a lowered position to a raised position by the articulated quadrant (2). According to the invention, a first rod (3) is additionally rotatably mounted on the collection vehicle and is rotatably connected to a second rod (4), the first rod (3) projecting beyond the connection between the first and second rods (4). The second rod (4) is rotatably mounted on the articulated quadrant (2) such that the projecting part (5) of the first rod (3) is spaced away from the container (8) mounted on the lifting device (1) in the lowered position, and the container (8) is tilted by the projecting part (5) in the raised position.Preferably, two joints (6, 7) of the parallelogram-shaped articulated quadrilateral (2) are attached to the collection vehicle, wherein the rotatable bearing of the first rod (3) on the collection vehicle is higher than the upper joint (7) of the articulated quadrilateral (2) on the collection vehicle.

Description

Technical field

[0001] The present invention relates to a lifting device, in particular for collection vehicles for emptying containers, comprising a lifting motor coupled to a four-way articulated joint attached to the collection vehicle, wherein the container can be lifted from a lowered position to a raised position by means of the four-way articulated joint. State of the art

[0002] Lifting devices for collection vehicles are already well known. For example, in Fig. 2The diagram shows a lifting device for emptying containers that requires only one lifting cylinder. The container is lifted and tilted in a single movement. A disadvantage of this design is the use of a hydraulic cylinder, which is inefficient for electric collection vehicles, and the fact that the container swings away from the collection vehicle as soon as the movement begins, potentially striking bystanders. The other diagrams in this document show two lifting cylinders, one for lifting and one for tilting, which is even less efficient for electric collection vehicles.

[0003] Two hydraulic cylinders are also provided, one for lifting and one for tilting. Brief description of the invention

[0004] The aim of the present invention is to achieve, with only one actuating element, a movement which initially does not or only barely moves away from the collecting vehicle, and to achieve a tilting movement only at the end of the lifting movement, whereby an overall economical solution is to be achieved.

[0005] According to the invention, this is achieved with a collection vehicle of the type mentioned above by the fact that a first rod is rotatably mounted on the collection vehicle, that the first rod is rotatably connected to a second rod, that the first rod projects beyond the connection of the first rod to the second rod, and that the second rod is rotatably mounted on the articulated quadrilateral, so that the projecting part of the first rod has a distance to the container arranged on the lifting device in the lowered position, and the container is tilted by the projecting part in the raised position.

[0006] The arrangement of the two rods allows for an initial gap between the rod and the container being emptied. During the lifting motion, this gap is reduced until the protruding part makes contact with the container. Once the protruding part makes contact, the container is simultaneously tilted and lifted. Because the container is lifted first (at an angle to the vehicle), there is minimal movement away from the vehicle, preventing any person from being struck by the rod swinging forward during the lifting process.

[0007] A preferred embodiment consists in two joints of the articulated quadrilateral being attached to the collection vehicle. Attaching two joints ensures a secure and stable arrangement on the vehicle.

[0008] Another embodiment of the invention consists in the rotatable bearing of the first rod on the collection vehicle being located higher than the lower joint of the articulated quadrilateral on the collection vehicle, and preferably also higher than the upper joint of the articulated quadrilateral on the collection vehicle. This provides a simple solution for reducing the distance of the protruding part to the point of tipping the container.

[0009] A particularly preferred embodiment consists in the articulated quadrilateral being essentially a parallelogram. The parallelogram ensures that the container is lifted without rotation, as long as the protruding part does not rotate the container.

[0010] Another particularly preferred embodiment consists in the articulated quadrant being directed obliquely upwards from the collection vehicle in the lowered position. This arrangement ensures that the container is moved towards the collection vehicle as soon as the lifting movement begins.

[0011] It is advantageous for the first rod to be curved or have a bend. This ensures that it rests at an almost right angle to the container or a plate for the container, which is beneficial for force transmission.

[0012] If the lifting motor is an electric motor, it is advantageous to provide a measuring device for measuring the electric motor's current consumption. As explained in more detail in the figure description, the weight of the container's contents can be determined by measuring the current consumption without requiring a load cell and without stopping the movement. Brief description of the drawing figures

[0013] The present invention is explained in more detail with reference to the accompanying drawings. They show: Fig. 1 a lifting device according to the invention in the lowered position; and Fig. 2 The lifting device according to the invention in the raised position for emptying a container. Description of the execution types

[0014] Fig. 1Figure 1 shows a lifting device 1 according to the invention in its lowered position. A four-bar linkage 2 is provided, which can lift a container 8 that can be suspended from the four-bar linkage 2 via a plate 9. The four-bar linkage 2 is a parallelogram, so that lifting the container 8 does not cause it to tilt. The four-bar linkage 2 is lifted by a motor. Two joints 6, 7 of the four-bar linkage 2 are located on the collection vehicle (indicated by the wall to which the two joints are attached). Furthermore, a first rod 3 is rotatably mounted on the collection vehicle. The first rod 3 is rotatably connected to a second rod 4. The other end of the second rod 4 is rotatably connected to the upper arm of the four-bar linkage 2. The first rod 3 projects beyond the connection with the second rod 4. In the lowered position, there is a gap between the projecting part 5 of the first rod 3 and the plate 9, and thus between the container 8 and the first rod 3.During the lifting movement, the distance between the protruding part 5 and the plate 9 is reduced until the protruding part 5 abuts the plate 9. Subsequently, the protruding part 5 rotates the plate 9, causing the container 8 to tip ( ). Fig. 2 This tilting occurs only in the final part of the movement, ensuring that container 8 is not tipped prematurely and that the collected material is actually tipped into the collection vehicle. In the raised position, vibration with the motor is also possible, allowing any remaining collected material that is wedged in container 8 or does not fall out for other reasons to also fall into the collection vehicle. Container 8 is only tilted by the protruding part 5, as the articulated quadrilateral is a parallelogram.

[0015] Out of Fig. 1It is evident that the lowered position is the position in which container 8 protrudes furthest from the collection vehicle, since the arms of the articulated quadrilateral 2 extend diagonally upwards away from the collection vehicle. A person operating the collection vehicle can therefore stand directly in front of container 8 and will not be struck by it during the lifting movement. This is, of course, advantageous for occupational safety.

[0016] The entire movement is achieved by a single motor, located, for example, at the lower joint 6 or the upper joint 7. This can be an electric motor that lifts the articulated joint 2. The electric motor sets a shaft in rotation, applying a certain torque. The required torque increases with the weight of the container to be emptied. Furthermore, the current flow increases with the applied torque, so the weight of the container 8 can be determined by measuring the current flow. This can be done both before and after emptying, allowing the weight of the collected material to be measured. Regular calibration is advisable to account for changes in friction that may affect the required torque. Therefore, using an electric motor eliminates the need for an additional load cell. List of reference symbols

[0017] 1 Lifting device 2 Articulated quadrilateral 3 First rod 4 Second rod 5 Protruding part of the first rod 6 Lower joint of the articulated quadrilateral 7 Upper joint of the articulated quadrilateral 8 Container 9 Plate

Claims

1. Lifting device (1) in particular for collection vehicles for emptying containers (8) with a lifting motor coupled to an articulated quadrilateral (2) attached to the collection vehicle, wherein the container (8) can be lifted from a lowered position to a raised position by the articulated quadrilateral (2), characterized by the fact that a first rod (3) is rotatably mounted on the collection vehicle, that the first rod (3) is rotatably connected to a second rod (4), that the first rod (3) projects beyond the connection of the first rod to the second rod (4), and that the second rod (4) is rotatably mounted on the articulated quadrilateral (2), such that the projecting part (5) of the first rod (3) has a distance from the container (8) which is arranged on the lifting device (1) in the lowered position, and the container (8) is tilted by the projecting part (5) in the raised position.

2. Lifting device according to claim 1, characterized by the fact thattwo joints (6, 7) of the articulated quadrilateral (2) are attached to the collection vehicle.

3. Lifting device according to claim 2, characterized by the fact that the rotatable bearing of the first rod (3) on the collection vehicle is higher than the lower joint (6) of the articulated quadrilateral (2) on the collection vehicle, preferably also higher than the upper joint (7) of the articulated quadrilateral (2) on the collection vehicle.

4. Lifting device according to one of claims 1 to 3, characterized by the fact that the four-pointed quadrilateral (2) is essentially a parallelogram.

5. Lifting device according to one of claims 1 to 4, characterized by the fact that The articulated quadrilateral (2) is directed obliquely upwards from the collecting vehicle in the lowered position.

6. Lifting device according to one of claims 1 to 5, characterized by the fact that the first rod (3) is curved or has a kink.

7. Lifting device according to one of claims 1 to 6, characterized by the fact that The lifting motor is an electric motor.

8. Lifting device according to claim 7, characterized by the fact that A measuring device is provided for measuring the current consumption of the electric motor.

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