Industrial truck with warning device

p0001The invention relates to an industrial truck with a warning device which can project a light effect on the pavement.

p0002Loaders are known for example in embodiments as a counterbalance trucks, reach trucks and warehouse equipment. In particular, these three types of industrial trucks are widely used on industrial premises and in storage areas where staying even people while visibility is limited by storage racks and embedded loads and spatial circumstances. It is known to provide a warning system of approaching trucks optical warning devices at the trucks that will attract the attention of people around. A long-known and widely used solution for this are rotating beacons or flashing lights, which are located in the upper part or at an overhead guard of industrial trucks, often referred to as yellow warning lights.

p0003A disadvantage of the flashing warning lights that is due to the often large number of simultaneously-propelled industrial trucks and the constantly blinking light nor reflections constantly in all areas of a bearing may be imperceptible, these are often not specifically noted or not perceived that a concrete danger is approaching by a vehicle. Also the constant visibility of the warning lights can be perceived as unpleasant and lead to acceptance problems.

p0004Further, in the prior art, for example, from <patcit id="pcit0001" dnum="DE102006002960A1"><text>DE 10 2006 002 960 A1</text></patcit>, Trucks with an optical warning device is known in which a respective forward facing light effect is projected as a safety light on the road to warn people in the area in front of the oncoming truck. This allows, for example, specifically one in a dangerous area of ​​an approaching truck to exploiting dividend person to be warned by the attention-grabbing, moving light spot on the floor, the safety light usually in a fixed distance in front of the truck and / or, in the case of reverse, behind the truck is projected onto the roadway. The light effect is turned on respectively in the direction of travel and in an alternative embodiment change depending on vehicle speed its distance to the truck and / or its size.

p0005A disadvantage of this prior art that a light spot alone is not always optimal perceptible. A further disadvantage in the embodiments that vary depending on the vehicle speed, that it generates expenses in the implementation.

p0006The invention is therefore based on the object to provide a truck of the type mentioned are available, with the warning function for people around the truck is improved.

p0007This object is achieved by a truck with the features of claim 1. Advantageous developments of the invention are specified in the subclaims.

p0008The object is achieved in that in a truck with a warning device which can project a light effect on the pavement, the light effect has a projection with at least one in the direction of travel of the truck forwardly positioned front warning area and one in the direction of travel of the truck rear mounted rear warning area wherein the projection surface by a boundary line and / or illuminated area is shown.

p0009It may be labeled as a portion of the projection surface solely by an illuminated gauge the respective warning area. Alternatively it can be illuminated the entire surface. Finally, it is also possible that the entire surface of the warning areas or the projection surface is illuminated and the boundary line is highlighted, for example by a higher intensity. Advantageously can be taken a simple geometric shape, without more calculations are required. By not only a light dot or light spot serves as a warning device, but a flat warning area is marked, which extends up to the truck zoom, more attention is excited in people who get into this area, or to approach this. This is especially true if the projection screen is illuminated surface. For example, can extend up to the truck an illuminated surface of the warning areas and the projection surface. Also, a warning area or projection formed solely by a boundary line are characterized in that the boundary line is always formed by the vehicle edge of the truck.

p0010The front warning area and / or the rear warning area may consist of one across the width of the truck extending rectangle.

p0011Compared to a pure light spot or spot a whole area is characterized marked, even omitting exactly equivalent to that which the truck would take at continue and where therefore there could be a danger to people in the area of ​​the industrial truck.

p0012Advantageously composed of front warning area and / or the rear warning area of ​​a trapezoid whose base corresponds to the width of the truck.

p0013Depending on how strong the angle with which the trapezoidal widens from the truck off on, can thus also be highlighted, would be entailed by not accurate straight ahead, for example, with a slight steering of the truck which area.

p0014In one development, the projection is a total of the truck enclosing surface which extends at a greater distance from the truck in front and behind the truck.

p0015This is coming for a person in the area surrounded by each direction the truck from the screen and the person striking pointed around to the truck. In particular, should also be noted that even at a nearby passing hazards may arise and is therefore referred to this. It is advantageous that, for example, if a person emerges in the area of ​​a shelf lane, drive past the same moment across a truck, such as a forklift truck with a small distance.

p0016The projection may be a the truck enclosing ellipse.

p0017This is an easy to implement form that particular offers the opportunity to present the front and rear warning range for the special danger areas in front and behind the truck by appropriately "In-The-length-pulling".

p0018In a development of the industrial truck is a function of a steering angle of the truck, the front in direction of travel warning area is oriented towards the inside of a plane determined by the direction of the steering lock cam and / or the rear in the direction of travel warning area oriented toward the outside of the determined by the direction of the steering lock cam.

p0019In particular, industrial trucks, which are served by an accompanying driver, have one or more steered wheels with a very large steering angle and very small turning circles. Examples include Reach truck and storage and retrieval units, which have a made of a single wheel or more wheels rear axle whose wheels can be taken, which partly turning angle are to reach virtually transversely to the vehicle longitudinal axis. In particular, this also applies to counterbalance truck with a steered rear axle. This, however, swings, for example, the rear of the vehicle very strong side at full turn. Conversely sweeps a mounted ahead of the vehicle load receiving device, in particular a fork, when turning the space laterally. It is therefore advantageous if the respective warning area, which is in forward direction of travel, such as when driving straight ahead the one that is positioned in front of a load bearing device such as a fork, is oriented in the direction of the curve inward in the pivots the load fork. For example, in a forward driven left-hander this is longitudinally adjacent or before the fork to the left. Since the stern while simultaneously swings to the other side, the warning area to the direction lying behind relative is oriented to the outside. When reversing, the directions are reversed accordingly, since then, for example, in a counterbalance truck, the rear weight of the outside coming pivots toward the curve inward and the fork pivots outwards, thus are the danger areas on the respective opposite side. Advantageously, therefore, this is done at the same time for the front and back of the truck for both warning areas, since the hazards described occur always at the same time. However, it is also conceivable that only one of the warning areas is oriented during cornering to the side.

p0020The direction of travel in front is exploiting dividend warning area may consist of one across the width of the truck extending rectangle connected to a to the inside of the curved path adjoining semicircle exist.

p0021Thus, as represented when driving straight ahead the entire warning area in the direction of travel and are warned additionally against lateral movement during cornering. The form described is geometrically simple and well implemented.

p0022The forward facing rear to exploiting dividend warning area may consist essentially of three quarters of a circle whose center is approximately equal to the outer on the cam track vehicle corner.

p0023Thus particularly the corner of the vehicle is emphasized when cornering, which located by pivoting the outermost and thus represents potentially dangerous point.

p0024The truck can be a counterbalance truck with steered rear wheels.

p0025Such counterbalance truck driving in very wide ranges of factory premises where employees reside, particularly outside of explicit storage areas that are not constantly familiar with forklifts, and show the characteristics described above of the strong pivoting out of the rear weight as well as the sweep of an area with the load fork to the curve inside. Therefore, the previously described features at counterweight lift trucks are particularly advantageous.

p0026The illuminated surface can increase as projected in the intensity in the direction of the truck.

p0027Thus, the view towards the truck will be automatically directed to the increasing brightness.

p0028Advantageously, the size of the projection and / or the intensity of the driving speed.

p0029This allows an easy and simple adaptation to the increased risk potential of a fast moving truck.

p0030The light effect can be generated by at least one attached to an overhead guard lighting device.

p0031The relatively high-mounted position for precise illumination of the boundary line or to the boundary line is enabled.

p0032The light effect can be generated by at least one mounted in the region of a vehicle floor lighting device.

p0033Deep Inappropriate lighting devices, for example, at the edge of the truck in the area of ​​the subfloor or, for example, at the bottom of the rear weight allow illuminate without causing shadows around the load bearing device, when the light emitting device is mounted on an overhead guard.

p0034The lighting device may be a laser.

p0035In one embodiment of the truck, the lighting device of light emitting diodes is formed.

p0036Further advantages and details of the invention will become apparent from the exemplary embodiments illustrated in the schematic figures. This shows<dl id="dl0001"><dt>Fig. 1</dt><dd>an embodiment of an industrial truck according to the invention schematically in side view,</dd><dt>FIG. 2</dt><dd>schematically the truck of <figref idrefs="f0001">Fig. 1</figref> with a first embodiment of a projection in plan view,</dd><dt>Fig. 3</dt><dd>schematically the truck of <figref idrefs="f0001">Fig. 1</figref> with a second embodiment of a projection in plan view,</dd><dt>Fig. 4</dt><dd>schematically the truck of <figref idrefs="f0001">Fig. 1</figref> with a third embodiment of a projection in plan view,</dd><dt>Fig. 5a</dt><dd>the embodiment of <figref idrefs="f0002">Fig. 4</figref> with the projection when cornering forward right in supervision,</dd><dt>Fig. 5b</dt><dd>the embodiment of <figref idrefs="f0002">Fig. 4</figref> with the projection when cornering forward left in supervision,</dd><dt>Fig. 5c</dt><dd>the embodiment of <figref idrefs="f0002">Fig. 4</figref> with the projection when cornering backwards right into supervisory and</dd><dt>Fig. 5d</dt><dd>the embodiment of <figref idrefs="f0002">Fig. 4</figref> with the projection when cornering backward left in supervision.</dd></dl>

p0037The <figref idrefs="f0001">Fig. 1</figref> shows in side view a schematic representation of an industrial truck according to the invention 1, here for example of a counterweight fork-lift truck 2, with a first, forwardly disposed light emitting device 3 and a rearwardly located second light emitting device 3, respectively in the form of a laser 4th

p0038The counterbalance truck 2 has a run on a mast 5 load handling device 6 in the form of a load fork 7 formed by two prongs. The mast 5 is disposed above a front axle with front wheels 8, on the counterweight fork-lift truck 2 is driven. Behind the mast 5 is a head guard 9 and a counterweight 10. Below the counterweight 10 are steered rear wheels 11, with which the counterbalance forklift 2 is steered. Underneath the overhead guard 9 a driver's seat 12 with a steering wheel. 13

p0039The first, front lighting device 3, as well as the second, rear lighting device 3 are arranged on the overhead guard 9 preferably in the upper area and send laser light 14 of the respective laser 4 or a focused beam of a light source such as light emitting diodes, as the light effect by which a projection 16 is projected on the road surface 18, the projection 16 having a forward warning area 15 and a rear warning area 17th The projection 16 and the front warning area 15 as well as the rear warning area 17 may be marked by the fact that a boundary line 19 is marked by light. Alternatively or at the same time but also the entire surface of the projection 16 can be lit, while it is also possible to increase the intensity of light with increasing proximity to the truck first Another light-emitting device 20 is mounted in the region of the front vehicle floor and is lit in the warning front portions 15. Similarly, a further light-emitting device 21 is disposed in the rear lower portion of the counterweight 10, which shines in the rear warning areas 17th This additional lighting devices 20,21 may be provided additionally or alternatively to the light emitting devices 3 on the overhead guard. 9 These further light emitting devices 20,21, which can also be designed as a laser 4, it is also possible areas to illuminate in the forward warning area 15 and rear warning area 17 of the projection 16, which would otherwise be obscured by parts of the lift mast 5 or the counterweight 10th

p0040The invention is not limited to the here described example of a counterbalance forklift truck 2 than 1, and can be applied to all types of industrial trucks

p0041The <figref idrefs="f0002">FIG. 2</figref> schematically shows the truck of <figref idrefs="f0001">Fig. 1</figref> with a first embodiment of the projection 16 in the form of an ellipse 22 surrounding the forklift 2 completely. The ellipse 22 is stretched so long shaped such that 17 arises before the trucks 2, the front warning area 15 and behind the forklift 2 rear warning area. The projection is, however, the side of the truck. 2

p0042The <figref idrefs="f0002">Fig. 3</figref> schematically shows the truck of <figref idrefs="f0001">Fig. 1</figref> with a second embodiment of the projection 16, wherein the forward warning area 15 consists of a trapezoid 23, the base line corresponds to the width of the forklift truck 2 and the widened in front of the forklift truck 2 on. There is also the rear warning area 17 of a further trapezium 23, whose base line also corresponds to the width of the forklift truck 2 and further widens behind the forklift second

p0043<figref idrefs="f0002">Fig. 4</figref> schematically shows the truck of <figref idrefs="f0001">Fig. 1</figref> with a third embodiment of a projection 16, wherein the forward warning area 15 consists of a rectangle 24 that extends across the width of the forklift second There is also the rear warning area 17 of another rectangle 24 which extends across the width of the forklift second

p0044The <figref idrefs="f0003">Fig. 5a</figref> shows the embodiment of <figref idrefs="f0002">Fig. 4</figref> with the projection 16 when cornering forward right, as indicated by the arrow. Here are the directions "right" and "left" with respect to a vehicle longitudinal axis facing toward the front of the vehicle independent of a direction defined. The front in the driving direction of the forklift 2 warning area 15 of the projection 16 is the inside of the curved path, turn right, oriented and consists of an over the width of the truck extending rectangle whose inner curve sidelines is replaced by a semicircle 25th The rear with respect to the direction of the forklift 2 warning area 17 of the projection 16 is the outside of the curved path, here the left-oriented and consists of a three-quarter circle 26 with its center 27 about themselves of at the position of right and thus curve outside rear corner the forklift truck 2 is located. In this case, as soon as the steering angle of the steering wheel 13 in the direction of travel forward exceeds a certain value, the projection 16 of the representation in the<figref idrefs="f0002">Fig. 4</figref> in the form of the <figref idrefs="f0003">Fig. 5a</figref> being transformed.

p0045The <figref idrefs="f0003">Fig. 5b</figref> shows the embodiment of <figref idrefs="f0002">Fig. 4</figref> with the projection 16 when cornering, forward the left as indicated by the arrow. The front in the driving direction of the forklift 2 warning area 15 of the projection 16 is the inside of the curved path, here the left-oriented and consists of an over the width of the truck extending rectangle whose inner curve sidelines is replaced by a semicircle 25th The rear with respect to the direction of the forklift 2 warning area 17 of the projection 16 is the outside of the curved path, here on the right, oriented and again consists of a three-quarter circle 26 with its center 27 approximately at the position of right and thus curve outside rear corner of the forklift truck 2 is located.

p0046The <figref idrefs="f0003">Fig. 5c</figref> shows the embodiment of <figref idrefs="f0002">Fig. 4</figref> with the projection 16 when cornering backward right, as indicated by the arrow. The front in the direction of travel of the truck 2 and formed from rectangular and semicircular 25 warning area 15 of the projection 16 is the inside of the curved path, right here, is based. The rear with respect to the direction of travel of the forklift truck 2 warning area 17 of the projection 16 again consists of a three-quarter circle 26 kurvenau ßenseitig with the approximate center 27, in this case a front corner of the vehicle.

p0047The <figref idrefs="f0003">Fig. 5d</figref> shows the embodiment of <figref idrefs="f0002">Fig. 4</figref> with the projection 16 backwards when cornering left, as indicated by the arrow. The front in the direction of travel of the truck 2 and formed from rectangular and semicircular 25 warning area 15 of the projection 16 is the inside of the curved path, left-oriented. The rear with respect to the direction of the forklift 2 warning area 17 of the projection 16 again consists of a three-quarter circle 26 whose center 27 is approximately at the position of right and thus curve outside, front corner of the truck. 2