Industrial truck with a first warning device and a second warning device

Description

[0001] The invention relates to a forklift truck with a first warning device and a second warning device, in particular a forklift truck with a control device which is configured to control the first warning device to issue at least one first warning signal and / or the second warning device to issue at least one second warning signal depending on a detected direction of travel of the forklift truck based on a direction sensor signal, and / or depending on an operational readiness of the forklift truck based on a detection sensor signal.

[0002] Furthermore, the invention relates to a method for issuing at least one warning signal from a forklift truck.

[0003] Industrial trucks include, for example, counterbalance forklifts, reach trucks, and warehouse equipment. These three types of industrial trucks, in particular, are widely used on company premises and in storage areas, such as warehouses, where people are present and visibility is restricted by storage racks, the loads stored on them, and the surrounding environment.

[0004] It is known to provide visual warning devices on industrial trucks as a warning system for approaching industrial trucks, intended to attract the attention of people in the vicinity. Such visual warning devices include, for example, rotating beacons or flashing lights, which are arranged in an upper area or on the roof of an operator's cab of an industrial truck and are often designed as yellow warning lights.

[0005] Furthermore, the publication DE 10 2006 002 960 A1 discloses industrial trucks with an optical warning device in which a light effect pointing in the direction of travel is projected onto the roadway at a fixed distance in front of the industrial truck as a safety light, in order to warn people in the vicinity of the approaching industrial truck. This allows, for example, targeted warnings of an approaching industrial truck in noisy environments, with the safety light usually projected onto the roadway at a fixed distance in front of the industrial truck and / or, in the case of reversing, behind the industrial truck.

[0006] Often, projectors are used as optical warning devices for this purpose, projecting a colored light effect, for example, blue, onto the roadway. The light effect projected onto the roadway can be in the form of a point. The optical warning device can be positioned on a forklift truck in such a way that the light effect projected onto the roadway points in the direction of travel of the forklift truck and precedes the truck in that direction at a certain distance, for example, forward and / or backward. The function of such light effects projected onto the roadway by means of an optical warning device is to signal to a person that a forklift truck is approaching. Particularly in areas with poor visibility, such as at intersections, these light effects projected onto the roadway allow people to recognize the approaching forklift truck at an early stage.This helps prevent accidents, as other people or drivers can react to these light effects projected onto the road, for example by reducing their speed or initiating manual evasive maneuvers.

[0007] Conventional optical warning devices for industrial trucks can have the disadvantage that, depending on the system used, different light signals or effects are emitted, which can be interpreted differently by people in the vicinity of the trucks. In particular, conventional optical warning devices for industrial trucks often lack a consistent logic that allows for a clear conclusion about the operating status of the respective trucks based on the nature of the different light signals or effects.

[0008] DE 10 2019 204 790 A1 discloses a device for generating an optical warning area.

[0009] The KR 101 459 760 B1 discloses a peripheral warning device for a forklift truck.

[0010] The CN 216 444 955 U reveals a safety warning light for forklift operation.

[0011] DE 10 2012 107 973 A1 discloses a method for warning people in industrial trucks.

[0012] DE 10 2014 105 634 A1 discloses a forklift truck with a warning device.

[0013] EP 2 840 561 A2 discloses a method for determining hazard levels in various areas.

[0014] The present invention is based on the objective of providing a forklift truck which can be operated with a reduced risk of collision.

[0015] This task is solved according to a first aspect by a forklift truck with the following features: a direction sensor configured to detect the direction of travel of the forklift truck and to output an electrical direction sensor signal indicating the detected direction of travel of the forklift truck; a detection sensor configured to detect the operational readiness of the forklift truck and to output an electrical detection sensor signal indicating the operational readiness of the forklift truck; a first warning device configured to output at least a first warning signal perceptible to a person in the vicinity of the forklift truck; a second warning device configured to output at least a second warning signal perceptible to a person in the vicinity of the forklift truck; and a control device configured toto control the first warning device for issuing at least one first warning signal and / or the second warning device for issuing at least one second warning signal depending on the detected direction of travel of the industrial truck based on the direction sensor signal, and / or depending on the operational readiness of the industrial truck based on the detection sensor signal, wherein the industrial truck is designed as a non-autonomous or semi-autonomous industrial truck, wherein the detection sensor comprises a seat sensor configured to detect an operator of the industrial truck sitting in the driver's seat and to issue an electrical seat sensor signal indicating the operator sitting in the driver's seat; wherein the first warning device and / or second warning device comprises an optical warning device, wherein the optical warning device comprises a plurality of corner lights,which are arranged at the corners of the cabin roof of an operator's cabin of the industrial truck; and wherein the optical warning device comprises a plurality of zone lights which are arranged and configured on the lateral sides of the cabin roof of the operator's cabin of the industrial truck to project a light onto a roadway to the side of the industrial truck; and wherein the optical warning device comprises a vehicle contour light which is arranged and configured on a rear side of the cabin roof of the operator's cabin of the industrial truck to project a light onto the roadway behind the industrial truck.

[0016] This achieves the technical advantage that, depending on the direction of travel of the industrial truck and / or depending on the operational readiness of the industrial truck, the first warning device and / or the second warning device can be controlled by the control unit in such a way that the specific operating state of the industrial truck can be communicated to the environment of the industrial truck.

[0017] Thus, people in the vicinity of the forklift can intuitively perceive, based on specific first warning signals issued by the first warning device and / or specific second warning signals issued by the second warning device, whether the forklift is merely in a resting or stationary position, or whether the forklift is moving, and what movements the forklift is performing or will perform. This allows people in the vicinity of the forklift to advantageously recognize whether a collision with the forklift is imminent or not.

[0018] The first warning device and the second warning device comprise, in particular, different warning devices, such that the first warning signal issued by the first warning device is different from the second warning signal issued by the second warning device.

[0019] The first warning device and / or the second warning device shall in particular comprise an optical warning device for emitting an optical warning signal which is visually perceptible to a person in the vicinity of the industrial truck, and / or an acoustic warning device for emitting an acoustic warning signal which is acoustically perceptible to a person in the vicinity of the industrial truck, and / or a haptic warning device for emitting a haptic warning signal which is perceptible to a person in the vicinity of the industrial truck by means of touch, wherein the first warning device and / or second warning device may in particular comprise the same types or different types of warning devices.

[0020] An optical warning device comprises, in particular, a light that emits light as an optical warning signal. An acoustic warning device comprises, in particular, a loudspeaker that emits a sound as an acoustic warning signal. A haptic warning device comprises, in particular, a vest worn by a person in the vicinity of the industrial truck, wherein the haptic warning signal comprises, in particular, a vibration signal from the vest that can be perceived by the person through their sense of touch.

[0021] An optical warning device is specifically designed to emit a plurality of different optical warning signals. An acoustic warning device is specifically designed to emit a plurality of different acoustic warning signals. A haptic warning device is specifically designed to emit a plurality of different haptic warning signals. The control unit is specifically designed to control the optical warning device and / or the acoustic warning device and / or haptic warning device to emit different optical and / or acoustic and / or haptic warning signals, depending on the respective operating state of the industrial truck.

[0022] The industrial truck is specifically designed as a non-autonomous industrial truck, which is manually operated by an operator. Alternatively, the industrial truck is specifically designed as an autonomous industrial truck, which can be operated automatically without an operator being present on board. Alternatively, the industrial truck is specifically designed as a semi-autonomous industrial truck, in which an operator is present on board, but only intervenes to a limited extent in the operation of the semi-autonomous industrial truck.

[0023] A corresponding non-autonomous or semi-autonomous industrial truck has, in particular, a driver's seat on which an operator of the industrial truck can sit, and has, in particular, a direction control device, especially a gearshift lever, for the operator to select a direction of travel for the industrial truck.

[0024] The current operating status of the industrial truck is detected by a number of sensors on the industrial truck.

[0025] The direction sensor detects the direction of travel of the industrial truck.

[0026] In the case of an autonomously or semi-autonomously designed industrial truck, the direction of travel can be transmitted to the industrial truck by an external direction control signal, e.g. from an external server, and detected by the direction sensor.

[0027] In a non-autonomous or semi-autonomous industrial truck, the direction sensor can be configured to detect a switching state of a direction encoder of the industrial truck and to output an electrical direction sensor signal indicating the detected switching state of the direction encoder.

[0028] The electrical signal from the direction sensor, which indicates the detected switching state of the direction switch, allows the control unit to recognize, for example, whether the direction switch is in a forward, neutral, or reverse position. If, for instance, the direction switch is in a neutral position, the forklift cannot move. In this case, the control unit will deactivate the second warning device, particularly the audible warning device, and activate the first warning device, particularly the visual warning device, only as a stationary light. This allows a person near the forklift to intuitively recognize that there is currently no immediate danger of collision.

[0029] However, if the control device detects, for example, a forward or reverse driving position of the direction indicator, the forklift truck may be about to start moving, so that in this case, for example, the control device activates a flashing of lights of the first, in particular optical, warning device in order to warn people in the vicinity of the forklift truck of a possible start-up of the forklift truck.

[0030] The detection sensor registers whether the industrial truck is ready for operation.

[0031] In a non-autonomous or semi-autonomous industrial truck, the detection sensor includes a seat sensor designed to detect an operator of the industrial truck sitting in the driver's seat and to output an electrical seat sensor signal indicating the operator sitting in the driver's seat.

[0032] Through the electrical seat sensor signal emitted by the seat sensor, the control unit also recognizes, for example, whether the operator is sitting in the driver's seat of the industrial truck, thus ensuring that the first and / or second warning device is not unnecessarily activated if, for example, no operator is present in the industrial truck, and thus it is not possible to start the industrial truck even if the direction switch is in the forward or reverse position.

[0033] The control unit can detect various operating states of the industrial truck via a multitude of sensor inputs from a number of different sensors of the industrial truck, and depending on the respective detected operating state of the industrial truck, specifically control the first, in particular optical, warning device and / or the second, in particular acoustic, warning device in order to emit a specific first, in particular optical, warning signal and / or second, in particular acoustic, warning signal reflecting the respective operating state, so that clearly perceptible communication to the environment of the industrial truck can be ensured.

[0034] According to an advantageous embodiment, the industrial truck has a parking brake for blocking the wheels of the industrial truck in a stationary state, wherein the industrial truck has a parking brake sensor configured to detect a switching state of the parking brake and to output an electrical parking brake sensor signal indicating the switching state of the parking brake, and the control device is configured to output the first warning device for outputting at least one first warning signal and / or the second warning device for outputting at least one second warning signal depending on the detected direction of travel of the industrial truck based on the direction sensor signal, and / or depending on the operational readiness of the industrial truck based on the detection sensor signal.and / or to control it depending on the detected switching state of the parking brake based on the parking brake sensor signal.

[0035] This achieves the technical advantage that the electrical parking brake sensor signal indicates to the control unit whether the parking brake is released and whether the industrial truck is about to start moving or not.

[0036] The control device can take the electrical parking brake sensor signal into account, particularly only when the industrial truck is stationary, and can activate the first warning device and / or the second warning device, particularly independently of the parking brake sensor signal, when the industrial truck is moving.

[0037] According to an advantageous embodiment, the industrial truck has a drive system for propelling the industrial truck, wherein the industrial truck has a drive sensor, in particular a pedal, for activating the drive system, wherein the industrial truck has a drive sensor sensor configured to detect activation of the drive sensor and to output an electrical drive sensor signal indicating activation of the drive sensor, and wherein the control device is configured to output the first warning device for outputting at least one first warning signal and / or the second warning device for outputting at least one second warning signal depending on the detected direction of travel of the industrial truck based on the direction sensor signal, and / or depending on the operational readiness of the industrial truck based on the detection sensor signal.and / or depending on the detected activation of the driving sensor based on the driving sensor signal, and / or in particular depending on the detected switching state of the parking brake based on the parking brake sensor signal.

[0038] This achieves the technical advantage that the electrical drive sensor signal indicates to the control unit that the drive of the industrial truck is activated and that the industrial truck is therefore moving.

[0039] If the industrial truck is designed as a non-autonomous or semi-autonomous truck, the driving transmitter includes, in particular, a physical element of the truck that can be operated by the operator, such as a pedal. If, on the other hand, the industrial truck is designed as an autonomous or semi-autonomous truck, the driving transmitter may, in particular, only include an electronic component of the truck's drive control system, which converts an external drive control signal from an external server into a propulsion signal for the truck.

[0040] When the control unit detects an actuated drive transmitter, it can, for example, activate the first warning device and / or the second warning device, particularly independently of the detection sensor signal, since the activation of the drive transmitter is correlated with the operational readiness of the industrial truck.

[0041] According to an advantageous embodiment, the industrial truck has a drive system for propelling the industrial truck at a travel speed, wherein the industrial truck has a travel speed sensor configured to detect the travel speed of the industrial truck and to output an electrical travel speed sensor signal indicating the detected travel speed of the industrial truck, and the control device is configured to output the first warning device for outputting at least one first warning signal and / or the second warning device for outputting at least one second warning signal depending on the detected travel direction of the industrial truck based on the travel direction sensor signal, and / or depending on the operational readiness of the industrial truck based on the detection sensor signal.and / or depending on the detected travel speed of the industrial truck based on the travel speed sensor signal, and / or in particular depending on the detected switching state of the parking brake based on the parking brake sensor signal, and / or in particular depending on the detected activation of the drive sensor based on the drive sensor signal.

[0042] This achieves the technical advantage that the control unit can distinguish, using the provided electrical speed sensor signal, whether the forklift is simply starting up or is traveling normally.

[0043] In particular, the control device is further designed to activate the first warning device and / or the second warning device to issue different warning signals, in particular different optical and / or acoustic warning signals, when different travel speeds are detected, so that people in the vicinity of the industrial truck can intuitively infer the travel speed of the industrial truck based on the corresponding warning signals.

[0044] According to the invention, the first warning device and / or second warning device comprises an optical warning device, wherein the optical warning device has a plurality of, in particular four, corner lights which are arranged at corners of a cabin roof of an operator's cabin of the industrial truck; and the optical warning device comprises a plurality of, in particular two, zone lights which are arranged and configured on lateral sides of the cabin roof of the operator's cabin of the industrial truck to project a light projection onto a roadway to the side of the industrial truck; and the optical warning device comprises a vehicle contour light which is arranged and configured on a rear side of the cabin roof of the operator's cabin of the industrial truck to project a light projection onto the roadway behind the industrial truck.

[0045] This achieves the technical advantage that, depending on the operating state of the industrial truck, a wide variety of lights of the optical warning device can be activated by the control unit, either alone or in combination, so that the corresponding operating state of the industrial truck can be perceived advantageously and intuitively by the people in the vicinity of the industrial truck.

[0046] According to an advantageous embodiment, the corner lights comprise a first corner light located at a front left corner of the cabin roof, a second corner light located at a front right corner of the cabin roof, a third corner light located at a rear left corner of the cabin roof, and a fourth corner light located at a rear right corner of the cabin roof;and / or the zone lights comprise a first zone light, which is arranged and configured on a first lateral side of the cabin roof, to project a light onto the roadway on a first side of the industrial truck, to the side of the industrial truck, and the zone lights comprise a second zone light, which is arranged and configured on a second lateral side of the cabin roof opposite the first lateral side, to project a light onto the roadway on a second side of the industrial truck opposite the first side.

[0047] This achieves the technical advantage that the four corner lights and the two zone lights ensure effective comprehensive illumination of the area around the industrial truck, which can be perceived by people in the vicinity of the industrial truck from different directions.

[0048] According to an advantageous embodiment, the first warning device and / or second warning device comprises an acoustic warning device, wherein the acoustic warning device in particular comprises a loudspeaker configured to emit at least one acoustic warning signal, wherein the loudspeaker is in particular arranged at a rear of the industrial truck.

[0049] This achieves the technical advantage that the loudspeaker enables an effective acoustic warning to be issued to the surroundings of the industrial truck.

[0050] In particular, the loudspeaker is not located on the roof of an operator's cabin of the industrial truck, but rather the loudspeaker is located at the rear of the industrial truck, in particular at the rear of a drive unit of the industrial truck.

[0051] According to an advantageous embodiment, the industrial truck has a person detection device for detecting a person in the vicinity of the industrial truck and is configured to output an electrical person sensor signal indicating the detected person in the vicinity of the industrial truck, and the control device is configured to output the first warning device for outputting at least one first warning signal and / or the second warning device for outputting at least one second warning signal depending on the detected direction of travel of the industrial truck based on the direction sensor signal, and / or depending on the operational readiness of the industrial truck based on the detection sensor signal, and / or depending on the detected person in the vicinity of the industrial truck based on the person sensor signal.and / or, in particular, depending on the detected travel speed of the industrial truck based on the travel speed sensor signal, and / or, in particular, depending on the detected switching state of the parking brake based on the parking brake sensor signal, and / or, in particular, depending on the detected activation of the drive sensor based on the drive sensor signal.

[0052] This achieves the technical advantage that the person detection device can effectively detect a person present in the vicinity of the industrial truck, and the first, in particular optical, warning device and / or the second, in particular acoustic, warning device can be controlled in such a way that a collision with the person is avoided.

[0053] According to an advantageous embodiment, the person detection device has a communication interface configured to receive a person signal from another communication interface of the person via a communication network, wherein the communication interface and the other communication interface comprise, in particular, radio communication interfaces, especially WLAN communication interfaces, or Bluetooth communication interfaces or 5G communication interfaces; or wherein the person detection device comprises an ultrasonic receiver for receiving an ultrasonic signal emitted by an ultrasonic emitter of the person; or wherein the person detection device comprises a radar receiver for receiving a radar signal emitted by a radar emitter of the person.

[0054] This achieves the technical advantage of ensuring effective communication between the person and the person detection device of the industrial truck for the purpose of detecting the person.

[0055] According to an advantageous embodiment, the control device is configured to control the second warning device for issuing at least one second warning signal and the first warning device for issuing at least one first warning signal when a person is detected in the vicinity of the industrial truck by the person detection device, wherein the control device is particularly configured to control the corner lights for issuing a flashing signal, the zone lights for issuing a flashing light projection on the roadway, and / or the vehicle contour light for issuing a flashing light projection on the roadway as optical warning signals.

[0056] This achieves the technical advantage that, in the event of a person being detected in the vicinity of the industrial truck, the activation of both warning devices, in particular the flashing light signals, ensures the greatest possible attention of the person to the light signals.

[0057] According to an advantageous embodiment, the control device is configured to activate the first warning device to issue at least one first warning signal when the detection sensor detects that the industrial truck is ready for operation, and when the direction sensor detects a direction of travel of the industrial truck, in particular a neutral position, a forward driving position and / or a reverse driving position of a direction encoder, wherein the control device is particularly configured to activate the zone lights to issue a constantly illuminated light projection on the roadway, and / or the vehicle contour light to issue a constantly illuminated light projection on the roadway as optical warning signals.

[0058] This achieves the technical advantage that the constantly illuminated light projection on the roadway provided by the zone lights and / or the vehicle contour light effectively communicates a standstill of the industrial truck to persons in the vicinity of the industrial truck.

[0059] According to an advantageous embodiment, the control device is configured to activate the first warning device to issue at least one first warning signal when the detection sensor detects that the industrial truck is ready for operation, and when the direction of travel sensor detects a direction of travel of the industrial truck, in particular a forward travel position and / or a reverse travel position of a direction encoder, and when the parking brake sensor detects that the parking brake is released, wherein the control device is in particular configured to activate the corner lights to issue a flashing signal as optical warning signals.

[0060] This achieves the technical advantage that the released parking brake indicates an impending start of the industrial truck, especially in combination with the forward or reverse driving position, whereby the corresponding impending start of the industrial truck can be effectively communicated to the outside by the corresponding flashing signals of the corner lights.

[0061] According to an advantageous embodiment, the industrial truck has a drive system for propelling the industrial truck, wherein the industrial truck has a drive sensor, in particular a pedal, for activating the drive system, wherein the industrial truck has a drive sensor sensor configured to detect activation of the drive sensor of the industrial truck and to output an electrical drive sensor signal indicating activation of the drive sensor, and wherein the control device is configured to control the first warning device for outputting at least one first warning signal and the second warning device for outputting a time-limited second warning signal when the direction sensor detects a change in the direction of travel of the industrial truck, in particular a change from reverse to forward position or a change from forward to reverse position of the direction sensor.and when the drive sensor detects activation of the drive sensor of the industrial truck, wherein the control device is specifically designed to control the corner lights to emit a flashing signal, the zone lights to emit a flashing light projection onto the roadway, and / or the vehicle contour light to emit a flashing light projection onto the roadway as optical warning signals.

[0062] This achieves the technical advantage that the starting of the industrial truck can be communicated to the outside both visually and audibly.

[0063] According to an advantageous embodiment, the industrial truck has a drive for propelling the industrial truck, wherein the industrial truck has a drive encoder, in particular a pedal, for activating the drive, wherein the industrial truck has a drive encoder sensor which is configured to detect activation of the drive encoder of the industrial truck and to output an electrical drive encoder sensor signal indicating activation of the drive encoder, and wherein the control device is configured to control the first warning device to output at least one first warning signal and the second warning device to output a constant second warning signal when the direction sensor detects a direction of travel of the industrial truck, in particular a forward travel position and / or a reverse travel position of the drive encoder, and when the drive encoder sensor detects activation of the drive encoder of the industrial truck.wherein the control device is particularly designed to control the corner lights to emit a flashing signal, the zone lights to emit a constantly luminous light projection onto the roadway, and / or the vehicle contour light to emit a constantly luminous light projection onto the roadway as optical warning signals.

[0064] This achieves the technical advantage that the movement of the industrial truck can be effectively communicated visually and audibly to the outside.

[0065] This problem is solved according to a second aspect by a method for issuing at least one warning signal from a forklift truck, wherein the forklift truck has a first warning device configured to issue at least one first warning signal perceptible to a person in the vicinity of the forklift truck, wherein the forklift truck has a second warning device configured to issue at least one second warning signal perceptible to a person in the vicinity of the forklift truck, wherein the forklift truck has a control device, a direction-of-travel sensor and a detection sensor, and wherein the method comprises the following features: detection of a direction of travel of the forklift truck by the direction-of-travel sensor;Output of an electrical direction sensor signal by the direction sensor, wherein the electrical direction sensor signal indicates the detected direction of travel of the industrial truck; and / or detection of the operational readiness of the industrial truck by the detection sensor; Output of an electrical detection sensor signal by the detection sensor, wherein the electrical detection sensor signal indicates the operational readiness of the industrial truck;and controlling the first warning device for issuing at least one first warning signal and / or the second warning device for issuing at least one second warning signal depending on the detected direction of travel of the industrial truck based on the direction sensor signal, and / or depending on the operational readiness of the industrial truck based on the detection sensor signal by the control device, wherein the industrial truck is designed as a non-autonomous or semi-autonomous industrial truck, wherein the detection sensor comprises a seat sensor which is designed to detect an operator of the industrial truck sitting in the driver's seat, and to output an electrical seat sensor signal which indicates the operator sitting in the driver's seat;wherein the first warning device and / or second warning device comprises an optical warning device, wherein the optical warning device comprises a plurality of corner lights arranged at the corners of a cabin roof of an operator's cabin of the industrial truck; and wherein the optical warning device comprises a plurality of zone lights arranged and configured on the lateral sides of the cabin roof of the operator's cabin of the industrial truck to project a light onto a roadway to the side of the industrial truck; and wherein the optical warning device comprises a vehicle contour light arranged and configured on a rear side of the cabin roof of the operator's cabin of the industrial truck to project a light onto the roadway behind the industrial truck.

[0066] This achieves the technical advantage that warning signals can be effectively communicated to the outside via the industrial truck.

[0067] Further advantages and details of the invention are explained in more detail by way of example with reference to the embodiments shown in the schematic figures. Here, the figures show(s). Figures 1A and 1B a forklift truck with a first warning device and a second warning device according to an embodiment of the present invention; and Figure 2 a schematic representation of a method for issuing at least one warning signal from a forklift truck according to an embodiment of the present invention.

[0068] The Figures 1A and 1B show a forklift truck with a first warning device and a second warning device according to an embodiment of the present invention.

[0069] In the Figure 1AThe forklift truck 1 is shown with a view towards the left side of the forklift truck 1. In the Figure 1B The forklift truck 1 is shown with a view towards the top of the forklift truck.

[0070] The industrial truck 1, which is designed in particular as a forklift truck, has a lifting mast 3 on which a load handling device 5 designed as a load fork and which can be moved in height is arranged for picking up loads.

[0071] The industrial truck 1 further comprises an operator's cabin 7 in which an operator of the industrial truck 1 can be located to control the industrial truck 1. A driver's seat 9 is arranged in the operator's cabin 7, on which the operator of the industrial truck 1 can sit. A steering device 11, in particular a steering wheel, is also arranged in the operator's cabin 7, by means of which the operator can control the direction of travel of the industrial truck 1.

[0072] The industrial truck 1 further comprises a first warning device 13 designed as an optical warning device, which is configured to emit at least one optical warning signal that is visually perceptible to a person in the vicinity of the industrial truck 1. The first warning device 13 is arranged, in particular, on the roof 15 of the operator's cabin 7 of the industrial truck 1, as described in more detail below.

[0073] The first warning device 13 comprises a plurality of, in particular four, corner lights 17, which are arranged at corners 19 of the cabin roof 15. Due to the in Figure 1A The view shown, looking from the left towards the industrial truck 1, is in the Figure 1AOnly a first corner light 17, which is arranged at the front left corner 19 of the cabin roof 15, and a second corner light 17, which is arranged at the rear left corner 19 of the cabin roof 15, are shown. A third corner light 17, arranged at the front right corner 19 of the cabin roof 15, and a fourth corner light 17, arranged at the rear right corner 19 of the cabin roof 15, are shown in the Figure 1A not shown. The corner lights 17 are in particular corner flashing lights 17, which are designed to each emit a flashing signal.

[0074] The first warning device 13 further comprises a plurality of, in particular two, zone lights 21, which are arranged and designed on the lateral sides 23 of the cabin roof 15 of the operator's cabin 7 of the industrial truck 1, to project a light projection 25 onto a roadway 27 to the side of the industrial truck 1, as shown in the Figure 1B is shown.

[0075] Due to the in Figure 1A The selected view is in the Figure 1A Only a first zone light 21 is shown, which is arranged and configured on a first lateral side 23 of the cabin roof 15 to project a light projection 25 onto the roadway 27 on a first side of the industrial truck 1, to the side of the industrial truck 1. The second zone light 21, which is arranged and configured on a second lateral side 23 of the cabin roof 15 opposite the first lateral side 23, to project a light projection 25 onto the roadway 27 on a second side of the industrial truck 1 opposite the first side, to the side of the industrial truck 1, is shown in the Figure 1A not shown.

[0076] The first warning device 13 further comprises a vehicle contour light 29, which is arranged and designed on a rear side 31 of the cabin roof 15 of the operator's cabin 7 of the industrial truck 1, to project a light projection 25 onto a roadway 27 behind the industrial truck 1, as is done, for example, in the Figure 1B is shown.

[0077] As from the Figure 1B As can be seen, the two zone lights 21 arranged on the lateral sides 23 of the cabin roof 15, as well as the vehicle contour light 29 arranged on the rear 31 of the cabin roof 15, generate a light projection 25 on the roadway 27, which surrounds the industrial truck 1 at a certain distance, at least in sections. This effectively displays a hazard perimeter extending around the industrial truck 1 to persons in its vicinity, visually indicated on the roadway 27.

[0078] The industrial truck 1 further comprises a second warning device 33 designed as an acoustic warning device, which is designed to emit at least one acoustic warning signal that is acoustically perceptible to a person in the vicinity of the industrial truck 1.

[0079] As from the Figure 1A As can be seen, the second warning device 33 is not arranged on the cabin roof 15 of the operator cabin 7 of the industrial truck 1, but rather the second warning device 33 is arranged on a rear side 35 of the industrial truck 1, in particular on a rear side 35 of a drive unit 37 of the industrial truck 1. In particular, the second warning device 33 includes a loudspeaker which is designed to emit at least one acoustic warning signal.

[0080] Due to the large number of lights 17, 21, 29 of the first warning device 13 and the second warning device 33, a large number of different combinations of optical and / or acoustic warning signals can be emitted, which alert persons in the vicinity of the industrial truck 1 to a wide variety of operating conditions or driving situations of the industrial truck 1, so that a particularly effective prevention of accidents can be achieved.

[0081] The following section will only discuss exemplary operating conditions of the industrial truck 1.

[0082] The first exemplary operating state is considered to be the rest state of the industrial truck 1, in which only the operator is sitting on the driver's seat 9 of the industrial truck 1 and a parking brake of the industrial truck 1 blocks the wheels of the industrial truck 1.

[0083] The industrial truck 1 has a feature in Figures 1A and 1BThe seat sensor (not shown) is designed to detect the operator seated in the driver's seat 9 and to output an electrical seat sensor signal indicating the presence of the operator seated in the driver's seat 9. The seat sensor includes, for example, a sensor that detects a deformation or displacement of at least one seat spring of the driver's seat 9 in order to detect an operator seated in the driver's seat 9.

[0084] The industrial truck 1 also has a parking brake for locking the wheels of the industrial truck 1 when it is stationary. The industrial truck 1 has a parking brake sensor which is designed to detect the switching state of the parking brake and to output an electrical parking brake sensor signal indicating the switching state of the parking brake.

[0085] One in Figure 1AThe control device 39 of the industrial truck 1, which is only shown schematically, is designed to control the first warning device 13 and / or the second warning device 33 depending on the operator sitting on the driver's seat 9 on the basis of the seat sensor signal issued by the seat sensor and depending on the detected switching state of the parking brake on the basis of the parking brake sensor signal.

[0086] The control device 39 is in particular designed to control the zone lights 21 to emit a constantly luminous light projection 25 on the roadway 27, and the vehicle contour light 29 to emit a constantly luminous light projection 25 on the roadway 27 as optical warning signals depending on the operator sitting on the driver's seat 9 on the basis of the seat sensor signal emitted by the seat sensor and depending on the detected switching state of the parking brake on the basis of the parking brake sensor signal.

[0087] In the first exemplary operating state, for example, the second warning device 33 and the corner lights 17 of the optical warning device 13 are not activated.

[0088] In a second exemplary operating state, the ready-to-drive state of the industrial truck 1 is considered, in which the operator remains seated in the driver's seat 9 of the industrial truck 1, but the parking brake of the industrial truck 1 has been released and the wheels of the industrial truck 1 are no longer locked. In the second exemplary operating state, there is a Figure 1A The direction control unit of the industrial truck 1, not shown, is in a neutral position.

[0089] The direction control of the industrial truck 1 is designed in particular as a shift lever and can be moved by the operator into a neutral position, a forward driving position and / or a reverse driving position in order to specify the direction of travel of the industrial truck 1.

[0090] The industrial truck 1 has a Figure 1AThe driving direction sensor (not shown) is designed to detect a switching state of the driving direction sensor and to output an electrical driving direction sensor signal indicating the detected switching state of the driving direction sensor.

[0091] The control device 39 is specifically designed to control the zone lights 21 for emitting a constantly luminous light projection 25 onto the roadway 27, the vehicle contour light 29 for emitting a constantly luminous light projection 25 onto the roadway 27, and the corner lights 17 for emitting pulsating light signals as optical warning signals depending on the operator sitting on the driver's seat 9 based on the seat sensor signal emitted by the seat sensor, depending on the detected switching state of the parking brake based on the parking brake sensor signal, and depending on the detected switching state of the direction sensor, in particular depending on the detected neutral position of the direction sensor, based on the electrical direction sensor signal.

[0092] In addition to the constantly illuminated light projection 25 on the roadway 27, in the second operating state the pulsating illumination of the corner lights 17 indicates to persons in the vicinity of the industrial truck 1 that the industrial truck 1 is ready to drive.

[0093] In the second exemplary operating state, for example, the acoustic warning device 33 is not activated by the control device 39.

[0094] In a third exemplary operating state, the stationary state of the industrial truck 1 immediately before a forward or reverse journey is considered, in which the operator is still sitting on the driver's seat 9 of the industrial truck 1, the parking brake of the industrial truck 1 is still released and the wheels of the industrial truck 1 are no longer blocked, and in which the direction control of the industrial truck 1 is in a forward travel position or in a reverse travel position.

[0095] However, in the third exemplary operating condition, the industrial truck 1 does not move.

[0096] The control device 39 is specifically designed to control the zone lights 21 for emitting a constantly luminous light projection 25 onto the roadway 27, the vehicle contour light 29 for emitting a constantly luminous light projection 25 onto the roadway 27, and the corner lights 17 for emitting low-frequency flashing light signals as optical warning signals depending on the operator sitting on the driver's seat 9 based on the seat sensor signal emitted by the seat sensor, depending on the detected switching state of the parking brake based on the parking brake sensor signal, and depending on the detected switching state of the direction sensor, in particular depending on the detected forward or reverse driving position of the direction sensor, based on the electrical direction sensor signal.

[0097] In particular, when the direction sensor detects a forward travel position, the control unit 39 can activate only the two front corner lights 17 to emit low-frequency flashing light signals. Similarly, when the direction sensor detects a reverse travel position, the control unit 39 can activate only the two rear corner lights 17 to emit low-frequency flashing light signals.

[0098] In addition to the constantly illuminated light projection 25 on the roadway 27, in the third operating state the low-frequency flashing light signals of the corner lights 17 indicate to persons in the vicinity of the industrial truck 1 that the industrial truck 1 is about to begin a forward or a reverse journey.

[0099] In the third exemplary operating state, for example, the second warning device 33 is not activated by the control unit 39.

[0100] In a fourth exemplary operating condition, the approach of the industrial truck 1 from a standstill in a forward or reverse movement is considered.

[0101] The industrial truck 1 has a Figure 1A a drive mechanism (not shown) for driving the industrial truck 1, wherein the industrial truck 1 has a drive encoder, in particular a pedal, for activating the drive mechanism, wherein the industrial truck 1 has a drive encoder sensor which is configured to detect activation of the drive encoder and to output an electrical drive encoder sensor signal indicating activation of the drive encoder.

[0102] The control device 39 is designed to control the first warning device 13 for issuing at least one first warning signal and the second warning device 33 for issuing at least one second warning signal depending on the detected switching state of the direction sensor based on the direction sensor signal, and depending on the detected activation of the driving sensor based on the driving sensor signal.

[0103] In particular, the control device 39 is designed to control the first warning device 13 for issuing at least one first warning signal and the second warning device 33 for issuing a time-limited second warning signal when the direction sensor detects a change in the switching state of the direction encoder, in particular a change from reverse driving position to forward driving position or a change from forward driving position to reverse driving position of the direction encoder, and when the drive encoder sensor detects an activation of the drive encoder of the industrial truck 1.

[0104] The control device 39 is in particular designed to control the corner lights 17 to emit a flashing signal, the zone lights 21 to emit a flashing light projection 25 on the roadway 27, and the vehicle contour light 29 to emit a flashing light projection 25 on the roadway 27 as optical warning signals.

[0105] In particular, when the direction sensor detects a forward travel position, the control unit 39 can only activate the two front corner lights 17 to emit the flashing signal. In particular, when the direction sensor detects a reverse travel position, the control unit 39 can only activate the two rear corner lights 17 to emit the flashing signal.

[0106] The control device 39 is in particular further designed to control the second warning device 33 for issuing a time-limited acoustic approach signal.

[0107] In particular, the control device 39 is further designed to activate the fourth operating state only after the industrial truck 1 has been stationary for more than five seconds, in order to avoid excessive visual and acoustic impairment of persons near the industrial truck 1 during a shunting operation.

[0108] In a fifth exemplary operating condition, the forward or reverse movement of the industrial truck 1 is considered.

[0109] The control device 39 is designed to control the first warning device 13 for issuing at least one first warning signal and / or the second warning device 33 for issuing at least one second warning signal depending on the detected switching state of the direction sensor based on the direction sensor signal, and depending on the detected activation of the driving sensor based on the driving sensor signal.

[0110] The control device 39 is configured to control the first warning device 13 to output at least one first warning signal and the second warning device 33 to output a constant second warning signal when the direction sensor detects a switching state of the direction encoder, in particular a forward driving position and / or a reverse driving position of the direction encoder, and when the drive encoder sensor detects activation of the drive encoder of the industrial truck 1, wherein the control device 39 is configured in particular to control the corner lights 17 to output a flashing signal, the zone lights 21 to output a constantly illuminated light projection 25 on the roadway 27, and the vehicle contour light 29 to output a constantly illuminated light projection 25 on the roadway 27 as optical warning signals.

[0111] The industrial truck 1 has, in particular, a travel speed sensor configured to detect the travel speed of the industrial truck 1 and to output an electrical travel speed sensor signal indicating the detected travel speed of the industrial truck 1. The control device 39 is configured, in particular, to control the first warning device 13 for outputting at least one first warning signal and / or the second warning device 33 for outputting at least one second warning signal, depending on the detected switching state of the direction sensor based on the direction sensor signal, and depending on the detected travel speed of the industrial truck 1 based on the travel speed sensor signal, and depending on the detected activation of the direction sensor based on the direction sensor signal.

[0112] Thus, a speed-dependent adjustment of the emitted acoustic, optical and acoustic warning signals can be achieved by, for example, increasing the flashing frequency of the corner lights 17 or the volume of the acoustic warning signal as the driving speed increases.

[0113] In a sixth exemplary operating condition, a hazardous situation of the industrial truck 1 is considered.

[0114] Here, the industrial truck 1 has a [feature / component] in Figure 1A and Figure 1B A person detection device (not shown) for detecting a person in the vicinity of the industrial truck 1, which is designed to output an electrical person sensor signal indicating the detected person in the vicinity of the industrial truck 1.

[0115] The control device 39 is designed to control the first warning device 13 for issuing at least one first warning signal and the second warning device 33 for issuing at least one second warning signal depending on the person detected in the vicinity of the industrial truck 1 on the basis of the person sensor signal.

[0116] The person detection device has, in particular, a communication interface configured to receive a person signal from another communication interface of the person via a communication network, wherein the communication interface and the other communication interface include, in particular, radio communication interfaces, especially WLAN communication interfaces, or Bluetooth communication interfaces or 5G communication interfaces; or wherein the person detection device includes an ultrasonic receiver for receiving an ultrasonic signal emitted by an ultrasonic emitter of the person; or wherein the person detection device includes a radar receiver for receiving a radar signal emitted by a radar emitter of the person.

[0117] The control device 39 is configured to control the second warning device 33 to issue at least one second warning signal and the first warning device 13 to issue at least one first warning signal when a person is detected in the vicinity of the industrial truck 1 by the person detection device, wherein the control device 39 is particularly configured to control the corner lights 17 to issue a flashing signal, the zone lights 21 to issue a flashing light projection 25 on the roadway 27, and the vehicle contour light 29 to issue a flashing light projection 25 on the roadway 27 as optical warning signals.

[0118] Thus, the person detection device ensures that a person approaching the industrial truck 1 is effectively detected, and a variety of visual and acoustic warning signals are emitted to prevent a collision between the person and the industrial truck 1.

[0119] The industrial truck 1 according to the invention allows relevant driving states of the industrial truck 1 to be made immediately apparent in the vicinity of the industrial truck 1, so that persons in the vicinity of the industrial truck 1 are informed and warned immediately by means of a clearly recognizable signal.

[0120] In addition, a fleet-wide and uniform system of optical and acoustic warning signals can be provided for different types of industrial trucks at different locations.

[0121] Furthermore, a clear and simple warning of potential hazards that correlate with the operating state of the industrial truck 1 is ensured.

[0122] Figure 2 Figure 1 shows a schematic representation of a method for issuing at least one warning signal from a forklift truck according to an embodiment of the present invention.

[0123] The method 50 comprises, as a first process step, the detection 51 of a direction of travel of the industrial truck 1 by the direction of travel sensor, and the output 53 of an electrical direction of travel sensor signal by the direction of travel sensor, wherein the electrical direction of travel sensor signal indicates the detected direction of travel of the industrial truck 1.

[0124] The method 50 alternatively or additionally includes as a second method step the detection 55 of an operational readiness of the industrial truck 1 by the detection sensor; and the output 57 of an electrical detection sensor signal by the detection sensor, wherein the electrical detection sensor signal indicates the operational readiness of the industrial truck 1.

[0125] Method 50 further comprises controlling 59 of the first warning device 13 to issue at least one first warning signal and / or the second warning device 33 to issue at least one second warning signal depending on the detected direction of travel of the industrial truck 1 on the basis of the direction sensor signal, and / or depending on the operational readiness of the industrial truck 1 on the basis of the detection sensor signal by the control device 39. Reference symbol list

[0126] 1 Forklift truck 3 Lifting mast 5 Load handling attachment 7 Operator cabin 9 Driver's seat 11 Steering device 13 First warning device 15 Cab roof 17 Corner lights 19 Corner of the cabin roof 21 Zone light 23 Lateral side of the cabin roof 25 Light projection 27 Roadway 29 Vehicle contour light 31 Rear of the cabin roof 33 Second warning device 35 Rear of the forklift truck 37 Drive unit of the forklift truck 39 Control device 50 Method for issuing at least one warning signal 51 Method step: Detect a direction of travel of the forklift truck 53 Method step: Issue an electrical direction sensor signal 55 Method step: Detect operational readiness of the forklift truck 57 Method step: Issue an electrical detection sensor signal by the detection sensor 59 Method step: Control the first and / or the second Warning device

Claims

1. Industrial truck (1), having the following features: a driving direction sensor which is configured to detect a driving direction of the industrial truck (1) and to output an electrical driving direction sensor signal which indicates the detected driving direction of the industrial truck (1), a detection sensor which is configured to detect an operational readiness of the industrial truck (1) and to output an electrical detection sensor signal which indicates the operational readiness of the industrial truck (1), a first warning apparatus (13) which is configured to output at least one first warning signal which can be perceived by a person in an environment of the industrial truck (1), a second warning apparatus (33) which is configured to output at least one second warning signal which can be perceived by a person in an environment of the industrial truck (1), and a control device (39) which is configured to control the first warning apparatus (13) to output the at least one first warning signal and / or the second warning apparatus (33) to output the at least one second warning signal as a function of the detected driving direction of the industrial truck (1) on the basis of the driving direction sensor signal, and / or as a function of the operational readiness of the industrial truck (1) on the basis of the detection sensor signal, wherein the industrial truck (1) is configured as a non-autonomous or partially autonomous industrial truck, wherein the detection sensor comprises a seat sensor which is configured to detect an operator of the industrial truck sitting on the driver's seat of the industrial truck, and to output an electrical seat sensor signal which indicates the operator sitting on the driver's seat; wherein the first warning apparatus (13) and / or second warning apparatus (33) comprises an optical warning apparatus (13, 33), wherein the optical warning apparatus (13, 33) comprises a plurality of corner lights (17) which are arranged at corners (19) of a cab roof (15) of an operator's cab (7) of the industrial truck (1); and wherein the optical warning apparatus (13, 33) comprises a plurality of zone lights (21) which are arranged on lateral sides (23) of the cab roof (15) of the operator's cab (7) of the industrial truck (1) and are configured to project a light projection (25) onto a road (27) laterally adjacent to the industrial truck (1); and wherein the optical warning apparatus (13, 33) comprises a vehicle contour light (29) which is arranged on a rear side (31) of the cab roof (15) of the operator's cab (7) of the industrial truck (1) and is configured to project a light projection (25) onto the road (27) on the rear side behind the industrial truck (1).

2. Industrial truck (1) according to Claim 1, wherein the industrial truck (1) has a parking brake for blocking wheels of the industrial truck (1) in a stationary state of the industrial truck (1), wherein the industrial truck (1) has a parking brake sensor which is configured to detect a switching state of the parking brake and to output an electrical parking brake sensor signal which indicates the switching state of the parking brake, and wherein the control device (39) is configured to control the first warning apparatus (13) to output the at least one first warning signal and / or the second warning apparatus (33) to output the at least one second warning signal as a function of the detected driving direction of the industrial truck (1) on the basis of the driving direction sensor signal, and / or as a function of the operational readiness of the industrial truck (1) on the basis of the detection sensor signal, and / or as a function of the detected switching state of the parking brake on the basis of the parking brake sensor signal.

3. Industrial truck (1) according to Claim 1 or 2, wherein the industrial truck (1) has a travel drive for driving the industrial truck (1), wherein the industrial truck (1) has an accelerator, in particular a pedal, for activating the travel drive, wherein the industrial truck (1) has an accelerator sensor which is configured to detect activation of the accelerator and to output an electrical accelerator sensor signal which indicates the activation of the accelerator, and wherein the control device (39) is configured to control the first warning apparatus (13) to output the at least one first warning signal and / or the second warning apparatus (33) to output the at least one second warning signal as a function of the detected driving direction of the industrial truck (1) on the basis of the driving direction sensor signal, and / or as a function of the operational readiness of the industrial truck (1) on the basis of the detection sensor signal, and / or as a function of the detected activation of the accelerator on the basis of the accelerator sensor signal, and / or in particular as a function of the detected switching state of the parking brake on the basis of the parking brake sensor signal.

4. Industrial truck (1) according to one of the preceding claims, wherein the industrial truck (1) has a travel drive for driving the industrial truck (1) at a driving speed, wherein the industrial truck (1) has a driving speed sensor which is configured to detect the driving speed of the industrial truck (1) and to output an electrical driving speed sensor signal which indicates the detected driving speed of the industrial truck (1), and wherein the control device (39) is configured to control the first warning apparatus (13) to output the at least one first warning signal and / or the second warning apparatus (33) to output the at least one second warning signal as a function of the detected driving direction of the industrial truck (1) on the basis of the driving direction sensor signal, and / or as a function of the operational readiness of the industrial truck (1) on the basis of the detection sensor signal, and / or as a function of the detected driving speed of the industrial truck (1) on the basis of the driving speed sensor signal, and / or in particular as a function of the detected switching state of the parking brake on the basis of the parking brake sensor signal, and / or in particular as a function of the detected activation of the accelerator on the basis of the accelerator sensor signal.

5. Industrial truck (1) according to one of the preceding claims, wherein the optical warning apparatus (13, 33) comprises four corner lights (17) which are arranged at corners (19) of the cab roof (15) of the operator's cab (7) of the industrial truck (1); and wherein the optical warning apparatus (13, 33) comprises two zone lights (21) which are arranged on lateral sides (23) of the cab roof (15) of the operator's cab (7) of the industrial truck (1) and are configured to project a light projection (25) onto the road (27) laterally adjacent to the industrial truck (1).

6. Industrial truck (1) according to Claim 5, wherein the corner lights comprise a first corner light (17) which is arranged at a front left corner (19) of the cab roof (15), a second corner light (17) which is arranged at a front right corner (19) of the cab roof (15), a third corner light (17) which is arranged at a rear left corner (19) of the cab roof (15), and a fourth corner light (17) which is arranged at a rear right corner (19) of the cab roof (15); and / or wherein the zone lights (21) comprise a first zone light (21) which is arranged on a first lateral side (23) of the cab roof (15) and is configured to project a light projection (25) onto the road (27) on a first side of the industrial truck (1) laterally adjacent to the industrial truck (1), and wherein the zone lights (21) comprise a second zone light (21) which is arranged on a second lateral side (23) of the cab roof (15) opposite the first lateral side (23) and is configured to project a light projection (25) onto the road (27) on a second side of the industrial truck (1) opposite the first side laterally adjacent to the industrial truck (1).

7. Industrial truck (1) according to one of the preceding claims, wherein the first warning apparatus (31) and / or the second warning apparatus (33) comprises an acoustic warning apparatus (33), wherein the acoustic warning apparatus (31, 33) comprises in particular a loudspeaker which is configured to output the at least one acoustic warning signal, wherein the loudspeaker is arranged in particular on a rear side (35) of the industrial truck (1).

8. Industrial truck (1) according to one of the preceding claims, wherein the industrial truck (1) has a person detection device for detecting a person in the environment of the industrial truck (1) and is configured to output an electrical person sensor signal which indicates the detected person in the environment of the industrial truck (1), and wherein the control device (39) is configured to control the first warning apparatus (13) to output the at least one first warning signal and / or the second warning apparatus (33) to output the at least one second warning signal as a function of the detected driving direction of the industrial truck on the basis of the driving direction sensor signal, and / or as a function of the operational readiness of the industrial truck (1) on the basis of the detection sensor signal, and / or as a function of the detected person in the environment of the industrial truck (1) on the basis of the person sensor signal, and / or in particular as a function of the detected driving speed of the industrial truck (1) on the basis of the driving speed sensor signal, and / or in particular as a function of the detected switching state of the parking brake on the basis of the parking brake sensor signal, and / or in particular as a function of the detected activation of the accelerator on the basis of the accelerator sensor signal.

9. Industrial truck (1) according to Claim 8, wherein the person detection device has a communication interface which is configured to receive a person signal from a further communication interface of the person via a communication network, wherein the communication interface and the further communication interface comprise in particular radio communication interfaces, in particular WLAN communication interfaces, or Bluetooth communication interfaces or 5G communication interfaces; or wherein the person detection device comprises an ultrasonic receiver for receiving an ultrasonic signal emitted by an ultrasonic emitter of the person; or wherein the person detection device comprises a radar receiver for receiving a radar signal emitted by a radar emitter of the person.

10. Industrial truck (1) according to Claim 8 or 9, wherein the control device (39) is configured to control the second warning apparatus (33) to output the at least one second warning signal and the first warning apparatus (13) to output the at least one first warning signal if a person in the environment of the industrial truck (1) is detected by the person detection device, wherein the control device (39) is configured in particular to control the corner lights (17) to output a flashing signal, the zone lights (21) to output a flashing light projection (25) on the road (27), and / or the vehicle contour light (29) to output a flashing light projection (25) on the road (27) as optical warning signals.

11. Industrial truck (1) according to one of the preceding claims, wherein the control device (39) is configured to control the first warning apparatus (13) to output the at least one first warning signal if an operational readiness of the industrial truck (1) is detected by the detection sensor, and if a driving direction of the industrial truck (1) is detected by the driving direction sensor, in particular a neutral position, a forward driving position and / or a reverse driving position of a driving direction indicator, wherein the control device (39) is configured in particular to control the zone lights (21) to output a constantly illuminated light projection (25) on the road (27), and / or the vehicle contour light (29) to output a constantly illuminated light projection (25) on the road (27) as optical warning signals.

12. Industrial truck (1) according to one of the preceding Claims 2 to 11, wherein the control device (39) is configured to control the first warning apparatus (13) to output the at least one first warning signal if an operational readiness of the industrial truck (1) is detected by the detection sensor, and if a driving direction of the industrial truck (1) is detected by the driving direction sensor, in particular a forward driving position and / or a reverse driving position of a driving direction indicator, and if a released parking brake is detected by the parking brake sensor, wherein the control device (39) is configured in particular to control the corner lights (17) to output a flashing signal as optical warning signals.

13. Industrial truck (1) according to one of the preceding claims, wherein the industrial truck (1) has a travel drive for driving the industrial truck (1), wherein the industrial truck (1) has an accelerator, in particular a pedal, for activating the travel drive, wherein the industrial truck (1) has an accelerator sensor which is configured to detect activation of the accelerator of the industrial truck (1) and to output an electrical accelerator sensor signal which indicates the activation of the accelerator, and wherein the control device (39) is configured to control the first warning apparatus (13) to output the at least one first warning signal and the second warning apparatus (33) to output a time-limited second warning signal if a change in the driving direction, in particular a switch from the reverse driving position to the forward driving position or a switch from the forward driving position to the reverse driving position of the driving direction indicator, is detected by the driving direction sensor, and if activation of the accelerator of the industrial truck (1) is detected by the accelerator sensor, wherein the control device (39) is configured in particular to control the corner lights (17) to output a flash signal, the zone lights (21) to output a flashing light projection (25) on the road (27), and / or the vehicle contour light (29) to output a flashing light projection (25) on the road (27) as optical warning signals.

14. Industrial truck (1) according to one of the preceding claims, wherein the industrial truck (1) has a drive for driving the industrial truck (1), wherein the industrial truck (1) has an accelerator, in particular a pedal, for activating the travel drive, wherein the industrial truck (1) has an accelerator sensor which is configured to detect activation of the accelerator of the industrial truck (1) and to output an electrical accelerator sensor signal which indicates the activation of the accelerator, and wherein the control device (39) is configured to control the first warning apparatus (13) to output the at least one first warning signal and the second warning apparatus (33) to output a constant second warning signal if a driving direction, in particular a forward driving position and / or a reverse driving position of the driving direction indicator, is detected by the driving direction sensor, and if activation of the accelerator of the industrial truck (1) is detected by the accelerator sensor, wherein the control device (39) is configured in particular to control the corner lights (17) to output a flash signal, the zone lights (21) to output a constantly illuminated light projection (25) on the road (27), and / or the vehicle contour light (29) to output a constantly illuminated light projection (25) on the road (27) as optical warning signals.

15. Method (50) for outputting at least one warning signal of an industrial truck (1), wherein the industrial truck (1) has a first warning apparatus (13) which is configured to output at least one first warning signal which can be perceived by a person in an environment of the industrial truck (1), wherein the industrial truck (1) has a second warning apparatus (33) which is configured to output at least one second warning signal which can be perceived by a person in an environment of the industrial truck (1), wherein the industrial truck (1) has a control device (39), a driving direction sensor and a detection sensor, and wherein the method comprises the following features: detecting (51) a driving direction of the industrial truck (1) by way of the driving direction sensor; outputting (53) an electrical driving direction sensor signal by way of the driving direction sensor, wherein the electrical driving direction sensor signal indicates the detected driving direction of the industrial truck (1); and / or detecting (55) an operational readiness of the industrial truck (1) by way of the detection sensor; outputting (57) an electrical detection sensor signal by way of the detection sensor, wherein the electrical detection sensor signal indicates the operational readiness of the industrial truck (1); and controlling (59) the first warning apparatus (13) to output the at least one first warning signal and / or the second warning apparatus (33) to output the at least one second warning signal as a function of the detected driving direction of the industrial truck (1) on the basis of the driving direction sensor signal, and / or as a function of the operational readiness of the industrial truck (1) on the basis of the detection sensor signal, by way of the control device (39), wherein the industrial truck (1) is configured as a non-autonomous or partially autonomous industrial truck, wherein the detection sensor comprises a seat sensor which is configured to detect an operator of the industrial truck sitting on the driver's seat of the industrial truck, and to output an electrical seat sensor signal which indicates the operator sitting on the driver's seat; wherein the first warning apparatus (13) and / or second warning apparatus (33) comprises an optical warning apparatus (13, 33), wherein the optical warning apparatus (13, 33) comprises a plurality of corner lights (17) which are arranged at corners (19) of a cab roof (15) of an operator's cab (7) of the industrial truck (1); and wherein the optical warning apparatus (13, 33) comprises a plurality of zone lights (21) which are arranged on lateral sides (23) of the cab roof (15) of the operator's cab (7) of the industrial truck (1) and are configured to project a light projection (25) onto a road (27) laterally adjacent to the industrial truck (1); and wherein the optical warning apparatus (13, 33) comprises a vehicle contour light (29) which is arranged on a rear side (31) of the cab roof (15) of the operator's cab (7) of the industrial truck (1) and is configured to project a light projection (25) onto the road (27) on the rear side behind the industrial truck (1).

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