Patent Description:
Winter sport resorts typically comprise a cable car or a ski lift for transporting winter sport enthusiasts up to the mountain and also down from the mountain. These cable cars or ski lifts comprise one or several lift carriages having a cabinet or a seating for transporting people, while the winter sport equipment is mostly placed outside the carriage. This way, hundreds of people and even more winter sport equipment are transported each day to the mountain and/or from the mountain in the winter sport resort. The lift stations are covered often in housings or covered in outdoor constructions. The outdoor constructions comprise typically a central main construction and a tentlike roof. The lift station and the lift carriage in an outdoor construction are exposed to environmental conditions, like wizards, rain or snow fall especially uphill on the mountain, while the lift station and the lift carriage in the housing is mostly protected from environmental issues.

In addition, in the lift station the crowd of people is waiting very close to each other and they often push to the carriage for entrance. Thus, several problems may arise in the lift station, like people falling or stumbling into the driving lane or losing winter sport equipment.

<CIT> discloses a system and methods for ski lift operations comprising a digital video camera system for capturing a plurality of images of on-boarding and off-boarding operations. Said video system automatically detect, as the ski lift is operating, a potential problem situation in one or more of the on-boarding and off-boarding areas of the ski lift based on the plurality of digital images and initiates an action, as the ski lift is operating, to address the potential problem situation in one or more of the on-boarding and off-boarding areas of the ski lift, while the potential problem situation still exists.

<CIT> discloses a monitoring system of an uphill ropeway-lift station using a light ray detection system in the on/off-boarding area in the lift station.

The drawback of these solutions is that they use an optical monitoring system in the on-boarding and off-boarding area. Optical monitoring systems lose their efficiency, when the air monitoring area comprises dust-like snow crystals, which cause undefined back-reflections. False alerts and/or unwanted warnings may be the result, when using optical sensors.

An aim of the present invention is to avoid at least some of the drawbacks of the prior art, in particular, to provide an improved hazard monitoring system for an outdoor lift without any optical detection/monitoring system for a safety and fault-free transport with the lift cartridge of the outdoor lift.

The invention relates to a hazard monitoring system for an outdoor lift station of an outdoor lift, in particular a ropeway-lift, configured to detect objects or people in the driving lane of the lift carriage, comprising at least one detection unit, provided in the driving lane of the lift carriage, while said at least one detection unit comprises a detection grating, a detection net and/or a detection plate, at least one weight sensor system, on which the detection unit is mounted, and which is configured to provide a (weight-)load signal dependent on a weight or force being applied to the detection unit, and an evaluation system configured to provide a warning signal based on a level of the load signal.

The main focus of the monitoring in the outdoor lift station is to detect any fault, emergency or security issue, e.g. caused by objects or obstacles or people, in or on the driving lane in which the lift carriage moves in the outdoor lift station. Said obstacle exerts a weight or a force to the weight sensor system and triggers the load signal, which is sent to the evaluation system. The driving lane in the lift station may be arranged on ground-level, or underneath ground-level using a perron for guiding the lift carriages, in the lift station from the entrance area to the exit area. The driving lane in an outdoor lift station is always exposed to environmental conditions, like a wizard or an extreme snow fall or rain. Those environmental conditions continuously change the conditions on the driving lane and the personnel at the lift station is not able to always monitor the driving lane. The detection unit placed in the driving lane or at the driving lane supports to monitor the safely and fault-free transport with the lift carriages, especially during onboarding and/or offboarding of the transported people. Said detection unit comprises a detection grating, a detection net and/or a detection plate, connected with at least one weight sensor system. Thus, the weight and/or the force applied to the detection grating, detection net or detection plate is monitored. Said detection grating or detection net comprises a mesh. Thus, small obstacles, e.g. small stones, snow or rain, may pass the mesh and will not influence the weight or force sensing. Said detection plate prevents an accumulation of obstacles beneath the weight sensor system and therefore less maintenance is needed. Said weight sensor systems detects said faults in the driving lane and sends a load signal to the evaluation system, which may react accordingly by sending a warning signal to the personnel of the lift station and/or to the control system of the lift station. The detection unit does not comprise or require any optical sensor, e.g. LIDAR, RADAR, camera. Thus, the monitoring of the driving lane is independent of the environmental conditions and works sustainable.

Preferably, said weight sensor system is directly mounted to the detection grating, detection net and/or to the detection plate and is spaced apart from the ground-level in the driving lane, using at least one support structure. Thus, the detection unit is arranged closely to the floor of the lift carriage in the lift station. Therefore, the gap between the detection unit and the base of the lift carriage is minimized to enhance the safety conditions. Preferably, the gab is less then <NUM> or the gab is larger den <NUM>, to avoid drag objects or people. Said weight sensor system may comprise several weight sensors or force sensors for detecting the weight and/or the force and/or the pressure on the detecting grating, the detection net and/or the detection plate. The weight load acting on the several weight/force sensors is detected and send to the evaluation system, which is connected to the several sensors for the sensor data transfer.

Preferably, the load signal is triggered at an exceeding of a weight limit and/or at a sudden change of a load or object on the detection unit, e.g. a value of a change of the load signal per time unit, which is above a threshold. Said evaluation system comprises a processor and memory. Said processor comprises a computer program and said memory comprises at least some history data and/or calibration data. Said computer program may compare the actual load signal from the weight sensor system with the default data for judging or evaluating the exceeding of a weight limit and/or at a sudden change of a load or object on the detection unit. Thus, a reliable monitoring system is provided, which enhance the safety issues in the lift station.

Preferably, the weight limit is adjustable or calibratable. Said weight limit may be specified physically by the weight sensor or force sensor itself or may be specified digitally in the computer program. The adjustment of the weight limit may be set manually once in a time period, e.g. at the beginning of a ski season, or may be auto-set depending on the environmental conditions in the lift station. For example, a continues change of the weight load of the detection unit over a long time period may occur due to snow, ice or debris, which is recognized by the evaluation system and the weight limit is adjusted accordingly. Said weight limit may be calibrated based on the used detection plate, detection net or detection grating in the detection unit and/or based on the environmental conditions. For example, the weight limit for triggering the detection unit in summer may be different to the weight limit for triggering the detection unit in winter, where heavy snow and ice sticks to the detection plate, detection net or detection grating. Thus, the weight limit is easily adaptable to different environmental conditions, preferably automatically adapted by the evaluation system.

Preferably, the warning signal is linked to a control system of the lift motion, which is configured to slowdown or stop a drive of the outdoor lift, preferably when a weight limit is exceeded. The evaluation system is connected to the control system and continuously monitoring the weight load or force on the detection unit. Several warning limits may be stored in the memory of the evaluation system and the computer program may send different control data to the control system for different warning limits. If the predefined weight limit is exceeded, the evaluation system sends a control signal to stop the driving engine/drive in the lift station. A fully automated safety control is provided.

Preferably, the warning signal provides an acoustic and/or visual warning at the lift station and/or at a mobile device of a lift-personnel. Said warning limits are linked to several warning signals based on the level of the load signal. Less critical situations may demand less critical warning signals, e.g. sending a message to a mobile device of a lift-personnel to signalize the personnel that the snow on the detection unit has to be transported away. More critical situations may demand more critical warning signals, e.g. sending an acoustic and/or visual warning at the lift station to signalize the personnel or the crowed in the lift station the upcoming slowdown or stop a drive of the outdoor lift. Said warning signal may be send to a decentral surveillance station.

An increased load signal may trigger an automatic archiving and/or transmitting of a recording from a surveillance camera in the lift station of a defined time period before (and after) the warning signal has been provided an acoustic and/or visual warning. Thus, an enhanced surveillance is provided and the stop of the engine in the lift station may be avoided.

Preferably, the hazard monitoring system comprises a heating system that is configured to melt snow or ice at the weight sensor system and/or the detection unit, that could block a triggering of the at least one detection unit. Said heating system prevents a blocking of the weight sensors and enhances the operational safety of the monitoring system. Said heating system may comprise an infrared heating element or a resistance heating element. Said heating element may be a foil, which may be placed close to the weight sensor or force sensor to improve the heating efficiency. Said heating system may heat the detection grating, net or the detecting plate to a constant temperature between <NUM> to <NUM> for melting the ice and snow. The heating element is preferably connected to the evaluation system, which may control the functionality of the heating element. Thus, activating the heating element may be a parameter for adjusting or calibrating the weight sensor system, especially the weight limit, of the detection unit.

Preferably, multiple separated detection units along the driving lane in the lift station are provided in the lift station. The driving lane extends from the entrance area of the lift station to the exit area of the lift station. Thus, several detection units are placed in the driving lane from the entrance area to the exit area, comprising one or several detection gratings, nets and/or detection plates. Alternatively, one detection unit extending from the entrance area to the exit area is provided, comprising one or several detection gratings, nets and/or detection plates. Said detection units may be placed next to each other, without any gap, which increases the monitoring area. However, the one detection unit or the several detection units may be placed just in the exposed areas of the driving lane in the outdoor lift station and may be separated by a gap from each other.

Preferably, the warning signal comprises a location information of the load signal triggering the detection unit. Said location information comprises coordinates of the issue or obstacle on the detecting grating, net or the detecting plate in the one or several detection units, or comprises an identification number of the detecting grating, net or the detecting plate. Thus, the location of the default or the safety issue in the driving lane is provided and the personnel may quickly react and will quickly repair the issue. Thus, the lift motion and/or the speed of the carriage may be adjusted accordingly to the location information using the evaluation system.

In particular the evaluation system is configured to provide different types of warning signal based on a location information of the lift carriage in the lift station, dependent on a distance in-between the lift carriage and the triggered detection unit. Thus, the lift motion and/or the speed of the lift carriage may be adjusted accordingly to the location information. For example, service personnel might pass the driving lane right behind a lift carriage without alarm, but the lift will be stopped if there is a detection signal close before the lift carriage in movement direction. The evaluation system can also comprise an override switching function to disable the warning signal or manually control the lift for service, maintenance, emergencies, etc..

Preferably, there is at least one additional detection unit at an ending of an on-boarding or off-boarding for the lift carriage in the lift station, configured to detect hazardous last-minute onboarding/offboarding of the lift carriage. Said additional detection unit may be arranged in the boarding area at the boarding level, above ground-level. The additional detection unit comprises a weight sensor and/or a force sensor and is connected to the evaluation system. The detected load signal may be used to provide another warning signal based on a level of the load signal.

Preferably, the detection unit is solid and walkable. Thus, the detection grating and/or the detection plate can be easily cleaned from obstacles like snow, ice, or debris. , by the personnel. In another embodiment where the detection grating is configured as a flexible detection net, which might be more difficult to walk, the net can be configured to be unhinged from the sensors at its borders or be lowered to ground for maintenance.

Preferably, the detection grating has a mesh size below <NUM>. Said mesh size is large enough for been safely for human and animals. Small debris, snow and other small obstacles may pass the mesh of the detection grating or net and the weight load is not influenced by these obstacles.

Preferably, the detection unit is spaced from a floor/base of the lift station. Thus, obstacles may be deposited underneath the detection grating, net and may be collected easily. Alternatively, or supplementary, the detection unit is removable for maintenance.

Preferably, the outdoor lift is configured as a gondola lift, and the lift station is a gondola station and the lift carriage is a gondola. Said gondola consists of a cabinet with at least one gondola door and a rigid gondola floor. Thus, the inside of the gondola is saved from the snow storms. Preferably, the driving lane is configured by a perron on at least one side of the gondola and in level with an entry height of the gondola, and the detection unit is preferably arranged below entry height level underneath the base of the gondola.

The invention relates to method for monitoring hazards at a lift station of an outdoor lift, in particular by a above mentioned system comprising at least the following steps:.

The driving lane in an outdoor lift station is always exposed to environmental conditions, like a wizard or an extreme snow fall. Those environmental conditions continuously change the conditions on the driving lane and the personnel at the lift station is not able to always monitor the driving lane. The detection unit placed in the driving lane or at the driving lane supports to monitor the safe and fault-free transport with the lift carriages, especially during onboarding and/or offboarding of the transported people.

Said weight sensor systems detects said faults in the driving lane and sends a load signal to the evaluation system may react accordingly by sending a warning signal to the personnel of the lift station and/or to the control system of the lift station. The detection unit does not comprise or require any optical sensor, e.g. LIDAR, RADAR, camera. Thus, the monitoring of the driving lane is independent of the environmental conditions and works sustainable. Optical sensors lose their efficiency, when the air in the driving lane comprises dust-like snow crystals, or when rain drops dropping from the gondola in the driving lane, or when humidity in the air fogging the sensor, which cause undefended back-reflections. False alerts and/or unwanted warnings may be the result, when using optical sensors.

Preferably, the method comprises a providing of the warning signal to a drive system of the lift station to slowing down or stopping the outdoor lift based on the load signal. The load signal is triggered at an exceeding of a weight limit and/or at a sudden change of a load or object or people on the detection unit. Said weight sensor systems detects said faults or hazards in the driving lane and sends a load signal to the evaluation system may react accordingly by sending a warning signal to the personnel of the lift station and/or to the control system of the lift station.

Preferably, heating the weight sensor system and/or the detection unit at temperatures below or close to freezing. Said heating system prevents a blocking of the weight sensors and enhances the operational safety of the monitoring system.

Preferably, said evaluation system comprises a processor and said processor compares the detected information with a stored information for judging weight and/or force applied to the detection unit. Preferably said memory has computer-executable instructions stored thereon that, when executed, cause the at least one processor to capture information of the detection unit and generate warning signal based on the load signal. Furthermore, the computer-executable instructions may address load above the weight limit and communicate with the control system of the lift station. The computer-executable instructions can be integrated to a lift control system with at least one additional signal input configured for a load signal from a detection plate or gratin according to the invention.

The above-mentioned method may be performed in the evaluation system as computer-implemented method using the processor and the memory for performing the above-mentioned computer-executable instructions based on at least some of the steps of the above-mentioned method.

The invention relates to a computer program product stored on a data storage means or provided as an electromagnetic wave, comprising program code configured for.

Further advantageous aspects of the invention are explained in the following by means of exemplary embodiments and the figures. In the drawings, it is shown in a schematic manner. Furthermore, a numeric counting within this application is just used to differ between said parts of said hazard monitoring system.

The list of reference signs as well as the technical content of the patent claims and figures are part of the disclosure. The figures are described coherently and comprehensively. Identical reference signs indicate identical components, reference signs with different indices indicate functionally identical or similar components.

<FIG> disclose an outdoor lift station <NUM> comprising several lift carriages <NUM> like gondolas, which move from the entrance area <NUM> of the outdoor lift station <NUM> to the exit area <NUM> of the outdoor lift station <NUM>. The outdoor lift station <NUM> is covered in outdoor constructions 11a. The outdoor constructions 11a comprise a central main construction 11b, comprising the drive unit or driving engine 11d of the list station <NUM> and an e.g. tentlike roof 11c. The lift station <NUM> and the lift carriage <NUM> in the outdoor construction 11a are exposed to environmental conditions, like wizards, rain or snow fall, in particular since at least the entrance and exit areas <NUM> and <NUM> for the lift carriages <NUM> is open. Said gondolas <NUM> in this example consist of a cabinet <NUM> with at least one gondola door <NUM> and a rigid gondola base <NUM>. Said outdoor lift station <NUM> comprises a hazard monitoring system <NUM> configured to detect objects O in the driving lane <NUM> of the lift carriage <NUM>. The driving lane <NUM> in the lift station <NUM> is the pathway along which the lift carriages <NUM> are traveling through the lift station <NUM>. It is arranged underneath ground-level GL, using a perron <NUM> for guiding the lift carriages <NUM>, in the lift station <NUM> from the entrance area <NUM> to the exit area <NUM>. Said hazard monitoring system <NUM> comprises several detection units <NUM>, provided in the driving lane <NUM> of the lift carriage <NUM>. Said detection units <NUM> comprise a detection plate <NUM>, a detection net 35b and/or a detection grating 35a, several weight sensor systems <NUM>, on which the detection units <NUM> are mounted, and which are configured to provide a (weight-)load signal dependent on a weight or force being applied to the detection units <NUM>. The detection units <NUM> are placed in the driving lane <NUM> from the entrance area to the exit area, comprising each one or more detection gratings and/or detection plates. The detection grating can either be embodied solid like a steel-grating 35a or it can be embodied flexible like a flexible net 35b, such as a braided or knotted mesh. For example, a safety-net configured of flexible cords, strings, ropes or laces e.g. made of nylon, textile, synthetic filament yarn, etc. can be used.

Furthermore, an evaluation system <NUM> is provided, which is configured to provide a warning signal based on a level of the load signal. Said weight sensor systems <NUM> detect said objects/obstacles O in the driving lane <NUM> and provide a load signal to the evaluation system <NUM>, which reacts accordingly by sending a warning signal to the personnel of the lift station <NUM> and/or to the control system <NUM> of the lift station <NUM>. The control system is configured to slowdown or stop a drive 11d of the outdoor lift <NUM>. The evaluation system <NUM> is linked to the control system <NUM> and is continuously monitoring the weight load or force on the detection units <NUM>. Several warning limits are stored in a memory <NUM> of the evaluation system <NUM> and the computer program <NUM>, executed in a processor <NUM> of the evaluation system <NUM>, sends different control data to the control system <NUM> for different warning limits. For example, if the predefined weight limit is exceeded, the evaluation system <NUM> sends a control signal to stop the driving engine 11d in the lift station <NUM>.

<FIG> discloses a detailed view to the on/off-boarding area B in the lift station <NUM>. The evaluation system <NUM> comprises the processor <NUM> and is connected to the control system <NUM> of the driving engine 11d, the memory <NUM> and the detection plate <NUM> of the detection unit <NUM>. The detection plate <NUM> is solid and walkable, e.g. it can be embodied as a tread plate arranged on a weight sensing systems <NUM>.

Said obstacle O, e.g. an item or person fallen into the driving lane <NUM> of the gondola <NUM>, exerts a weight or a force to the weight sensor system <NUM> and triggers the load signal, which is sent to the evaluation system <NUM>. The weight sensor system <NUM> is directly mounted to the detection plate <NUM> and is spaced apart from the ground-level GL in the driving lane <NUM>, using the support structures <NUM>. Said weight sensor system <NUM> comprises several weight sensors <NUM> for detecting the weight and/or the force and/or the pressure on the detection plate <NUM>. The weight load acting on the several weight <NUM> is detected and send to the evaluation system <NUM>, which is connected to the several weight sensors <NUM> for sensor data transfer. For example, the weight sensors <NUM> can be embodied as a pressure sensitive switch, an endstop-, limit switch or distance-sensor under a spring-mounted grating, an inductive or capacitive proximity switch or sensor, a scales-sensor, a weight sensor, a pressure sensor, etc. or another sensor configured and arranged to provide an analog or digital signal dependent on wight or force applied to the detection plate or detection grating, preferably in direction of gravity.

The load signal is triggered at an exceeding of a weight limit and/or at a sudden change of a load or object O on the detection plate <NUM> of the detection unit <NUM>. Said memory <NUM> comprises at least some history data and/or calibration data. Said computer program <NUM> compares the actual load signal from the weight sensor system <NUM> with the default data for judging or evaluating the exceeding of a weight limit and/or at a sudden change (e.g. exceeding a certain weight-change per time limit) of a load or object on the detection unit <NUM>.

An increased load signal may trigger an automatic archiving of a recording from a surveillance camera in the lift station <NUM> in a defined time period before (and after) the warning signal has been provided and/or an acoustic and/or visual warning to passengers and/or operators (not shown).

The warning signal provides an acoustic and/or visual warning at the lift station <NUM>, which is shown on a display <NUM> and/or an acoustic signal generator and/or is shown at a mobile device of a lift-personnel (not shown). Said warning limits are linked to several warning signals based on the level of the load signal. The warning signal comprises a location information of the load signal triggering the detection unit <NUM>. Said location information comprises an identification number of the detecting plate <NUM>.

In addition, an embodiment of the hazard monitoring system <NUM> comprises a heating system <NUM>, which is configured to melt snow or ice at the weight sensor systems <NUM> and/or the detection plate <NUM>. Said heating system <NUM> prevents a blocking of the weight sensors <NUM>. Said heating system <NUM> comprises a resistance heating element <NUM>. Said heating system <NUM> heats the detecting plate <NUM> to a constant temperature between <NUM> to <NUM> for melting the ice and snow. The heating element <NUM> of the heating system <NUM> is connected to the evaluation system <NUM>, which is configured to control the functionality of the heating element <NUM>, e.g. dependent on environmental conditions.

<FIG> discloses another embodiment of a hazard monitoring system <NUM>. The hazard monitoring system <NUM> comprises the structural and functional means and arrangements described in the hazard monitoring system <NUM> of the <FIG>. However, the detection unit <NUM> comprises a detection grating <NUM>, which may be also used in the hazard monitoring system <NUM> of the <FIG>, instead of one of the above-described detection units <NUM>.

Said detection grating <NUM> can be a step grating or an open mesh flooring, comprising a mesh <NUM> having a mesh size below <NUM> and is solid and walkable. Thus, small obstacles, e.g. small stones, snow, rain, etc. pass the mesh <NUM> and will not influence the weight or force sensing. The detection grating <NUM> is spaced from a floor of the lift station <NUM>, as shown in <FIG>. The detection grating <NUM> comprises a weight sensor system <NUM> comprising several weight or force sensors <NUM>, which are connected to the evaluation system <NUM>. The weight sensor system <NUM> is configured to provide a (weight-)load signal dependent on a weight or force being applied to the detection grating <NUM>. The load signal can be one or more discrete on-off signals, but is preferably an analog measurement quantity which can be evaluated by a numerical comparison. The evaluation system <NUM> is provided, which is configured to provide a warning signal based on a level of the load signal. The warning signal comprises a location information of the load signal triggering the detection grating <NUM>. Said location information comprises coordinates of the issue in the surrounding of the detecting sensors <NUM> caused by the obstacles O in this mesh area. The evaluation system <NUM> is configured to provide different types of warning signal based on a location information and/or a location information of the lift carriage <NUM> in the lift station <NUM>, e.g. dependent on a distance in-between the lift carriage <NUM> and the triggered coordinates on the detecting grating <NUM>.

In addition, the hazard monitoring system <NUM> comprises a heating system <NUM>, which is configured to melt snow or ice at the weight sensor system <NUM>. Said heating system <NUM> prevents a blocking of the sensors <NUM>. Said heating system <NUM> comprises infrared heating element <NUM>. Said heating element <NUM> may be a foil <NUM>, which may be placed close to the weight sensor <NUM> to improve the heating efficiency. Said heating system <NUM> heats the detection grating <NUM> to a constant temperature between <NUM> to <NUM> for melting ice and snow. The heating element <NUM> is connected to the evaluation system <NUM>, which controls the functionality of the heating element <NUM>.

In an embodiment, the shown detection unit <NUM> can be configured with a flexible detection net 135b as detection grating. For example, a safety net consisting of woven, e.g. polypropylene or nylon filament yarn or another a highly tearproof and stable synthetic fibre. Preferably by a knotless weave, for keeping its shape, but alternatively also knotted or braided. An additional rope can be sewn/linked to the border mesh. The border gives the net a neat outer edge on all sides and simultaneously ensures stable, stress-resistant anchorage points. Preferably the net is equipped with multiple thimbles at its border configured as anchorage points. The border of the net or its thimbles can for example be mechanically linked to least one weight sensor system <NUM>, for example, a force-, load- or wight-sensor, here exemplary shown in broken lines in one of the corners for such an embodiment comprising a net. For example, such an embodied can be configured with at least one pull-sensor or pull-switch linking the net to the lift-station. For example, the border of the net or thimbles of the net are hooked into a Pull-to-Unlock Sensor, a Pull Cord Safety Switch or a pull force sensor. Under normal conditions of an empty net, the switch is not trigger, resp. a threshold of the sensor value is not reached. If there is an object in the net, its weight will trigger at least one switch or sensor at the net, as load signal and the warning signal is provided, the thimbles hooked into Pull-to-Unlock Sensor, Pull Cord Safety Switch or pull force sensor.

<FIG> discloses another embodiment of a hazard monitoring system <NUM> in an outdoor lift station <NUM>. The hazard monitoring system <NUM> comprises the structural and functional means and arrangements described in the hazard monitoring system <NUM> of the <FIG>. However, there are additional weight sensor systems <NUM> at an ending of an on-boarding or off-boarding B for the lift carriage <NUM> in the lift station <NUM>, configured to detect hazardous last-minute onboarding/offboarding of the lift carriage <NUM>. Said additional detection unit <NUM> are arranged in the boarding area B at the boarding level, above ground-level GL. The additional detection units <NUM> comprise a weight sensor and/or a force sensor and are connected to the evaluation system <NUM>. The detected load signal is used to provide another warning signal based on a level of the load signal, in particular as described above.

Furthermore, a method for monitoring hazards at a lift station of an outdoor lift, in particular by a above mentioned system, is disclosed in <FIG>, comprising at least the following steps (see also <FIG>):.

Said weight sensor systems <NUM> detects said objects/obstacles O in the driving lane <NUM> and sends a load signal to the evaluation system <NUM>, which reacts accordingly by sending a warning signal to the personnel of the lift station and/or to the control system of the lift station <NUM>.

Furthermore, after step d) the warning signal is provided to a drive system 11d of the lift station <NUM> to slowing down or stopping the outdoor lift based on the load signal. The load signal is triggered at an exceeding of a weight limit and/or at a sudden change of a load or object O on the detection plate <NUM>. Said weight sensor systems <NUM> detects said objects/obstacles O in the driving lane <NUM>.

Before step b) the weight sensor system <NUM> and/or the detection plate <NUM> is heated at temperatures below or close to freezing.

Said evaluation system comprises a processor and before step d) said processor compares the detected information with a stored information for judging weight and/or force applied to the detection unit. Said memory has computer-executable instructions stored thereon that, when executed, causes the at least one processor to capture information of the detection unit <NUM> and generates warning signal based on the load signal. Furthermore, the computer-executable instructions address load above the weight limit and communicates with the control system <NUM> of the lift station <NUM>.

The above-mentioned method may be performed in the evaluation system <NUM> as computer-implemented method using the processor <NUM> and the memory <NUM> for performing the above-mentioned computer-executable instructions based on at least some of the steps of the above-mentioned method.

Claim 1:
A hazard monitoring system (<NUM>; <NUM>; <NUM>) for an outdoor lift station (<NUM>; <NUM>) of an outdoor lift, in particular a ropeway-lift, configured to detect objects (O) in a driving lane (<NUM>) of a lift carriage (<NUM>), comprising,
- at least one detection unit (<NUM>; <NUM>), provided in the driving lane (<NUM>) of the lift carriage (<NUM>), while said at least one detection unit (<NUM>; <NUM>) com prises a detection grating (35a; <NUM>), a detection net (35b) and/or a detection plate (<NUM>),
- at least one weight sensor system (<NUM>; <NUM>), on which the at least one detection unit (<NUM>; <NUM>) is mounted, and which is configured to provide a load signal, in particular a weight-load signal, dependent on a weight or force being applied to the at least one detection unit (<NUM>; <NUM>)
- an evaluation system (<NUM>) configured to provide a warning signal based on a level of the load signal.