PL226454B1 - Industrial protective helmet for warning about health hazard - Google Patents

Description

The subject of the invention is an industrial safety helmet for warning against health and life hazards of workers employed in industries such as: construction, mining, production, transport, energy as well as in rescue and firefighting. Particularly advantageously, the invention can be used by underground workers and rescue workers employed in the mining industry, i.e. where severe climatic hazard conditions prevail.

From US 07/107, 269 of October 9, 1987, a sweat sweat is known to be used to support physical exercise. The device is intended to be used during sports training to minimize the number of interruptions during exercise. The device consists of a headband-shaped sweatband with a flexible vinylidene fluoride (PVDF film) on which an electronic circuit is placed. The electronic system consists of, among others, a heart rate sensor, a pace sensor, buttons activating functions, an in-ear headset and is based on a microcomputer for data processing and control of the entire device. The sensors are connected to the microcomputer by analog signals via operational amplifiers or filters. During work, the device measures the pulse and pace of exercises and transmits voice messages regarding measurements and exercises that are helpful during training. The functions are activated by buttons located around the perimeter of the sweatband.

The description of the Chinese utility model no. CN201928272 (U) of 8 December 2010 discloses a safety helmet with a wireless transmission system for miners used to monitor the health of miners and to facilitate rescue operations after an accident. The device consists of components such as a control system with a microprocessor, a transceiver system with a headset and a microphone, a gas sensor, two pulse sensors, a battery, and LED flashlights. The components are positioned at different locations on the helmet both on the inside and outside of the helmet shell. The pulse sensors are attached to the main helmet belt. An LED flashlight is attached to the outer helmet shell above the visor to illuminate the space in front of the miner. The components are interconnected by wiring that is attached to the helmet's structural elements. The device, via additional transmitters in mining tunnels, sends measurements from sensors to the ground management center. Thanks to this, in emergency situations, the management center has information on the health of miners in the mine and can communicate with them by voice. Additionally, if too much concentrated gas is detected, the device will alert the miner through an audible alarm in the handset.

A smart helmet for use by miners is known from Chinese utility model description No CN202980317 (U) of 27 November 2012. The device consists of a radio system, LED-based light module, microcontroller, communication device, body temperature sensor, respiratory rate sensor, pulse sensor, three-axis acceleration sensor, ambient temperature sensor, carbon monoxide sensor, humidity sensor, gas sensor, display, microphone, speaker, storage and power adapter. The components are located in various places on the helmet shell and on other structural elements. During operation, the device performs the functions of wireless identification and localization of the miner in real time, tracks the path traveled by the miner, measures the environment and physical condition of the miner, allows for wireless monitoring of the miner and sending wireless voice messages and messages on the display.

From the application description no. AU 2012271910 of December 21, 2012, a brain monitoring system mounted in a cap with a visor or other headgear with a sweatband is known. The device consists of an elastic sweatband on which there are discrete sensors measuring electrical impulses corresponding to brain waves. The signal is processed by the processor in the control circuit, the processed information is stored on the SD memory card. Connections between components are made through conductive materials. The control system with the SD memory card slot is located outside the sweatband. The sweatband can be cleaned and can be detached from the control system during this time. The device allows for convenient implementation of the method of measuring brain waves during fatigue, mainly by operators of heavy industrial machines, e.g. miners in mines.

From application description No. US 12 / 093,654 of November 13, 2006, a method for measuring the pulse in aviation helmets is known. The solution describes the principle of operation of oximetry pulse sensors, where the visible light LEDs or the infrared IR illumination illuminate the blood flowing in the veins. The different oxygen content in the blood, depending on the pulse, causes a different refraction and reflection of the transmitting wave, thanks to which the photodetector receives different values of the reflected wave. The described elements are placed in the helmet in the area of the head forehead and temporal part. In addition, the helmet has elements for signaling the exceeded pulse value in the form of stimulating electrodes, a loudspeaker set and a lit LED diode. An LED located on the side of the helmet at eye level illuminates the helmet's mask. The described method of heart rate measurement, based on the example of a flight helmet, allows the pilot to be signaled about exceeding the set thresholds by means of sound signals, electrical impulses and light signals visible on the transparent mask of the helmet.

From application description No. US 11 / 344,476 of January 31, 2006, a body temperature measuring device is known in applications for helmets or other headgear such as headbands. The device is intended for people who practice sports and workers in warm environmental conditions, such as miners in mines. The device consists of a temperature sensor in the form of a thermistor, a control system, signaling elements in the form of a LED, display or loudspeaker. A thermistor measures the temperature of the scalp in the forehead area. Additionally, in order to measure the pulse, the device has a positive electrode and a negative electrode located in the forehead to measure the voltage that is correlated with the pulse. All components are connected with each other by wires. The control circuit is assembled on the printed circuit board. The signaling elements are placed on the lateral side of the head. The device, on the example of a helmet or a band, allows you to monitor the health of an employee or athlete in terms of skin temperature and pulse measurement, and displays the measured values on the display located on the side of the head. Exceeding the set temperature value is signaled by an acoustic signal or a light signal in the form of an LED diode located on the side of the head.

Korean Application Description No. KR20020043471 dated June 10, 2002, discloses an open headband-like helmet-shaped helmet for measuring psychological states. The device has sensors to measure the electrical potential of the brain, brain waves, skin resistance, body temperature and blood flow rate. The sensors are located in the forehead area. In addition, the device has a wired and wireless transceiver system for transmitting information to an external computer, and a headset with a microphone for voice communication.

From the application description no. PCT / KR2009 / 007927 of 30 December 2009, a protective helmet and a headband measuring physiological parameters are known. The protective helmet has a pulse sensor, a body temperature sensor, a converter of non-electrical values into electrical signals and a system for wired or wireless communication. The components are placed on the helmet's main strap. The device measures the pulse and body temperature, processes the signals and transmits them to other devices outside the helmet. In conjunction with additional system elements such as a wristband or a computer, the device allows you to monitor, detect and signal health emergencies.

There is a prototype of a mining protective helmet for pulse measurement, which is generally described in the Miro News magazine of the Mineral Industry Research Organization, edition V26 / 1 spring / summer 2012. The helmet has built-in non-contact optical sensors for pulse measurement called MiMoS (Mining Industry Mobile Sensor) and a wireless transmitting system to transmit the measured information via the local network to a remote monitoring station. The MiMoS sensors are based on the photoplethysmogram technology (PPG, variable light absorption through the skin, similar to the principle of the pulse oximeter) and are installed on the helmet's headband. The helmet was developed by the University of Nottingham, UK.

The SMART Cycling Helmet of the manufacturer LifeBEAM (Israel) is known and is a product currently available on the market. The device has an oximetric pulse sensor located in the front part of the helmet in the forehead area, a 3-axis acceleration sensor, a radio module transmitting information in the bluetooth standard and a control system based on a microcontroller. During operation, the helmet sends information about the pulse and the parameters of the cyclist's movement to the mobile device on which a dedicated application is installed. Through the application, the user receives information about the completed training. An analogous product of the same company with the same principle of operation is the sports cap SMART Hat LifeBEAM, which is the carrier of the components described above.

PL 226 454 B1

The subject of the invention is an industrial safety helmet for warning against health risks. It consists of elements of a truss, shell and a visor, inside which a sweatband made of removable material for absorbing sweat is attached, with a shape that allows it to be attached to protective helmets. The sweatband has a built-in printed circuit with an installed electronic circuit. The electronic circuit comprises at least one integrated facial ambient temperature sensor connected to at least one integrated temperature sensor on the skin surface at the forehead area and at least one integrated infrared or visible light sensor for pulse measurement. The electronic system of the sweatband also includes at least one vibration motor for tactile signaling and at least one illuminating LED for light signaling, and a layer reflecting the light incident from the LED is provided on the underside of the helmet visor. The said electronic system is connected via a connection to the control system, which control system by means of a vibration motor and LED diodes signals the exceeding of the parameters monitored by said sensors. Preferably, the sweat electronics includes at least one integrated infrared proximity sensor. Preferably, the built-in printed circuit is permanently attached to the sweatband through an adhesive joint and is made of a rigid-flexible or flexible material. Preferably, the integrated temperature sensor for measuring the temperature on the skin surface at the forehead is molded in a thermally conductive plastic to form a shield that passes through the opening in the sweat-wicking material such that it protrudes from 0.1 to 2 mm. Preferably, the control system is attached to the helmet by being attached to a helmet shell or attached to a helmet harness. Preferably, the integrated temperature sensor for measuring the temperature between the head and the helmet shell is attached above the head to the helmet shell or to the helmet harness and is connected to the control system. Preferably, the integrated temperature sensor for measuring the temperature between the head and the helmet shell is mounted in the control circuit and is part of its electronics.

The industrial protective helmet according to the invention is able to warn against threats to the health and life of workers.

Thanks to the use of a vibration motor, the sweatband signals the employee's health hazard through vibrations felt by the employee. The vibration engine allows the employee to be signaled regardless of the degree of contamination of the elements in the case of standard traffic lights and jamming by ambient sounds, as is the case with sound signals.

For effective light signaling, in addition to vibration signaling, the sweatband has a LED diode combined with a light reflecting layer placed on the underside of the helmet visor. The use of such a kit avoids the use of additional construction elements of the helmet or sweatband, which would allow the light source to be seen by the human eye, such as for example booms. For this purpose, the underside of the helmet's visor was used. In order to make the light from the LED light falling on the visor more visible to the person wearing the helmet, the visor has been covered with a light reflecting layer. This layer may be in the form of a reflective sticker attached to the visor by means of an adhesive, or in the form of a layer of reflective paint applied by painting the underside of the visor of the helmet. It is allowed to use lenses with the LED diode in the sweatband to concentrate the light flux and use with the LED diode in the sweatband to condition the power supply, for example in the form of a converter providing sufficient current for the LED to work properly.

Each sweatband in a helmet is the element that gets dirty the fastest and loses its sweat-wicking properties over time. Due to this fact and taking into account the need to locate the sensors of physiological parameters in the place where the sweatband is mounted, so that the measurement points are located near the forehead of the head, these sensors are mounted in a removable sweatband. The sweatband for industrial safety helmets, depending on the type of helmet, is attached by fixing holes on the hooks on the main helmet strap or by Velcro fastening. Both attachment methods allow the sweatband to be detached from the helmet and replaced with a new one. The sweatband for industrial safety helmets has a built-in printed circuit with an installed electronic system, which consists only of the elements necessary for proper operation, i.e. it has mounted sensors for measuring temperature, pulse and distance, a vibration motor, an LED diode and a connection with derived signals from these components. They are cheap components compared to the value of the control system. Thanks to the minimum quantity

Due to the low value of the components in the sweatband, it is possible to replace a worn sweatband with a new one without major economic losses.

Thanks to the use of integrated sensors and digital transmission, there is no signal interference between the sensors and the control system. In addition, integrated sensors, unlike analog sensors and measuring systems, are more resistant to environmental factors, one housing integrates all the above components, which makes the measuring system smaller, has low measurement inertia, and consumes less energy necessary for proper operation.

The use of an integrated ambient temperature sensor in front of the face on the outer side of the sweatband allows for automatic temperature compensation and thus to eliminate disturbances in the temperature measurement on the forehead in the form of sudden temperature jumps caused by gusts of wind towards the face with a temperature significantly different from the body temperature in the forehead area. As a result, the value measured by the temperature sensor in the forehead area is corrected by the value of the wind gust temperature. The drafts can be long-lasting or short-lived, for example from the exhaust or cooling exhaust systems of machines operating in the worker's environment. Several such sensors may be used to increase the accuracy of the ambient temperature measurement in front of the face. The use of the ambient temperature sensor in front of the face minimizes the risk of triggering the alarm at the wrong time, i.e. when the employee is in good health.

The integrated temperature sensor on the skin surface in the forehead area is an essential and indispensable element for the health hazard signaling function. The measurement of the skin temperature on the forehead is strongly correlated with the internal temperature of the organism, which allows detecting the states of overheating of the organism. And in combination with the measurement of the pulse and additional measurements of the ambient temperature, it allows you to detect overheating of the body in advance. In order to exclude measurement disturbances resulting from random errors such as the occurrence of contamination of the sensor cover, which mediates the measurement, three sensors are used simultaneously to measure the temperature on the skin surface in the forehead area. The sensors are arranged in series with a distance of several centimeters from each other. Measurements from three sensors are averaged, but if one of the three temperature values differs significantly from the others, it is not taken into account.

The integrated sensor of infrared radiation or visible light for pulse measurement is an essential and necessary element for the implementation of the health hazard signaling function. Measurement of the pulse (heart rate) is strongly correlated with the general condition of the body, the state of overheating of the body, and employee fatigue. The sensor is an oximetry pulse sensor in which LED or infrared IR emitting diodes illuminate the blood flowing in the blood vessels. Different oxygen content in the blood, depending on the pulse, causes a different refraction and reflection of the transmitting wave, thanks to which the sensor's photodetector receives different values of the reflected wave. The best point of measurement for head heart rate is the temporal arteries, which run close to the skin and are clearly visible. In order to exclude measurement disturbances resulting from random errors such as the displacement of the helmet on the head, two sets of pulse sensors can be used simultaneously for the arteries on the left and right side of the head. Additionally, for the same reason, each set of heart rate sensors may consist of an array of sensors, e.g. 1x3, i.e. 3 sensors in 1 vertical column. Measurements from sensors are averaged, however, taking into account the fact that the range of the measured value is known (expected) and the fact that an incorrectly positioned or dirty sensor indicates the measurement significantly deviates from the range of the expected values (the difference is 2-3 times), it is easy to reject an erroneous measurement. The heart rate sensor uses an optical measuring method. Therefore, there must not be a diaphragm between it and the skin, which would attenuate the transmitted or received radiation to a degree that would prevent proper operation. For this reason, rectangular openings are made in the sweat-evacuation material at the locations where the pulse sensors are installed.

The integrated proximity sensor of infrared radiation used in the sweatband makes it possible to detect objects in the vicinity of the employee's face at a distance of up to 10 cm and to signal the employee about the possibility of a mechanical injury. The proximity sensor, in its structure, has at least a transmitting diode for infrared radiation (IR) and a photodetector. The proximity sensor works by measuring the distance from the object by measuring the time of passage of the IR wave between the sensor and the closest object within the range. To increase the range of this solution, more than one proximity sensor is used. In order to monitor the wide-angle area in front of the face, two extreme proximity sensors are used6

There are pads at the two ends of the sweatband and one proximity sensor at the center of the sweatband. Taking advantage of the fact that the head is oval, the proximity sensors positioned in this way are able to detect objects not only in front of the face but also on the side of the head. Due to this feature, the device is able to alert the worker who suddenly turns his head towards a dangerous object before the end of the movement. This avoids a collision with the object or reduces the force of the impact and reduces the severity of the injury. The worker is alerted by a vibration motor.

The printed circuit is permanently embedded in the sweatband through the glue joint, which eliminates its shift in relation to the sweat-wicking material. Such shifts change the position of the sensor measuring points. In the case of the integrated pulse sensor, its measurement is most accurate in the location on the skin, under which the temporal artery runs. In the case of integrated temperature sensors at the forehead, the location of the measurement points should be identical to that during the device calibration process. Shifts of the printed circuit board during use of the device are undesirable as they may lead to distorted measurements and erroneous readings.

The printed circuit is permanently embedded in the sweatband through the glue joint, which ensures that there is no gap between the printed circuit and the sweat wicking material, i.e. both elements tightly adhere to each other. Thanks to this property, when using the helmet in difficult environmental conditions, such as a mine, where large amounts of dust, small stones and chemically aggressive gases circulate in the air, these pollutants do not affect the surface of the printed circuit and do not cause mechanical or chemical damage. Indirectly, this feature reduces the failure rate of the device. Hotmelt adhesives, e.g. epoxy or acrylic, are used to connect electronic components and in the case described above. The glue connection described above can also be realized with a double-sided tape that has glue joints.

The built-in printed circuit is made of a rigid-flexible or flexible material, which allows the bending radius of the circumference to be adapted to the shape of the main belt at the place of the helmet's sweatband. Depending on the size of the helmet, the main belts are of different length and have different bending radii along the circumference, thanks to which the main belt adheres to the scalp and adapts to its shape, ensuring a stable fixation. The entire sweatband for industrial safety helmets is flexible, that is, both the printed circuit as well as the material for wicking sweat and other layers of the sweatband such as an adhesive layer. The scope of elasticity of the sweatband is slightly limited by the components mounted in it, for example integrated sensors, the housings of which do not deform and are hard. Rigid-flexible printed circuits are a hybrid structure containing both a rigid and a flexible part connected into one whole. They are made in multi-layer technology. The copper traces of the flexible part enable the connection to the rigid part of the printed circuit. Rigid fragments are made of laminates on glass-epoxy (FR4), aluminum MCPCB (Metal Core Printed Circuit Board), Teflon and ceramic substrates. On the other hand, flexible fragments as well as flexible printed circuits are most often made on a polyimide laminate.

The housing of the integrated temperature sensor on the surface of the skin at the forehead, which is soldered on the printed circuit board, is sealed with a thermally conductive plastic, forming a shield that passes through the holes in the sweat-wicking material, so that the shield protrudes by a distance of 0.1 up to 2 mm. This is a feature that allows correct measurement. The thermally conductive plastic sensor cover mediates the heat flow between the skin and the sensor's measuring field. The openings in the sweat-wicking material allow the cover to protrude above the material, thereby ensuring the necessary skin contact. The distance the cover protrudes from the sweat guide material depends on the thickness of the material and its ability to flatten with wear. The cover also protects the sensor against mechanical damage and environmental factors such as moisture and chemically aggressive gas. Such a measuring system enables the correct measurement of the temperature on the surface of the skin at the forehead.

The thermally conductive plastic cover of the sensor housing mediates the heat flow between the skin and the sensor measuring field, which introduces the measurement time inertia to the measuring system. This delay is due to the time it takes to transfer heat from the body to the sensor's measuring field. This eliminates disturbances related to temporary temperature jumps from external sources, which are treated as disturbances

From the measurement. Temperature spikes can be caused by temporary warm or cold external gusts of wind, a large amount of sweat or dirt between the sensor cover and the body, temporary removal of the helmet from the head to clean the sweatband, for example. Thus, the sensor cover is an analog filter against measurement noise from external sources. Other temperature sensors, in order to protect against mechanical damage and environmental factors, can also be protected by a plastic cover with thermally conductive properties.

The control system in the helmet is an essential and indispensable element for the correct operation of the invention and the implementation of the health hazard signaling function. The control system has in its structure a printed circuit with an installed electronic circuit having at least a power source such as a battery or battery, a power supply unit for conditioning the power supply and a microcontroller. The control system controls the sensors, a vibration motor and the LED, and processes the digitized values measured by the sensors via an algorithm implemented in memory in the microcontroller. Due to the strong evaporation of the head during high physical exertion and taking into account the harsh environmental conditions in the work environment, the control system should have a housing with a degree of protection against the ingress of dust and water, for example in the form of a plastic filler or a housing with IP65 protection. At the same time, in order to ensure the replacement of batteries or accumulators and at the connection point for connecting the sweatband, the housing should allow for disassembly of these elements, e.g. by using only protective varnishes or a closed and openable chamber in the housing. The control system may be attached to the helmet on its various elements, i.e. to the helmet shell or to the helmet harness. Examples of attaching the control unit to the helmet shell are glue mounting, snap fastening, screw fastening. An example of attaching the control system to a truss is attaching with Velcro straps to the upper side of the truss.

The use of an integrated temperature sensor between the head and the helmet shell enables a more accurate implementation of the health hazard signaling function. This function is triggered by an algorithm based on data from the temperature and pulse sensors. Measurement of the ambient temperature directly above the head of the employee inside the helmet allows the algorithm to take into account the degree of cooling of the employee's head during work. This information is needed due to the fact that the helmet shell has good heat-insulating properties, which means that warm air is accumulated on the inside of the helmet in the vicinity of the head. To cool this space, the helmet shell has vents. However, in situations of high physical effort of an employee who stays in conditions of increased ambient temperature, ventilation cannot keep up with heat dissipation, which may lead to a faster achievement of the overheating state of the body. The health hazard signaling mechanism informs the employee about the need to stop work to rest or temporarily remove the helmet in order to cool the head and remove accumulated warm air inside the helmet.

The combined temperature sensor for measuring the temperature between the head and the helmet shell can be attached to the helmet on its various elements, i.e. the helmet harness, the helmet shell, and can be mounted in the control system. To ensure correct measurement, this sensor is mounted over the head. In the case where the integrated temperature sensor for measuring the temperature between the head and the helmet shell is mounted in the control circuit, the sensor is installed on the control circuit's printed circuit board and is part of its electronics. Thanks to this, the helmet according to the invention does not have an additional cable harness and connections, which are exposed to mechanical damage, and faults resulting from play and contamination of contacts in the connections are eliminated. Due to the production technology and ensuring a greater tightness of the device in the vicinity of the sensors, it is allowed that the sensor covers overlap the sweat-wicking material.

The subject of the invention in an exemplary embodiment is shown in the drawing, in which fig. 1 shows a block diagram of the electronic system of a helmet according to the invention, fig. 2 and fig. 3 - sweatband for industrial safety helmets in two isometric views, fig. 4 - integrated temperature sensor on The surface of the skin at the forehead is shown approximately, Fig. 5 - an embodiment of the invention in the form of a mining protective helmet with an attached sweatband according to the invention.

Preferred embodiments of the present invention will be further described with reference to the drawings of Fig. 1, Fig. 2, Fig. 3, Fig. 4 and Fig. 5.

PL 226 454 B1 in mining as a mining protective helmet (Fig. 5), which is intended to protect the health and life of underground workers (miners).

The principle of operation of the mining safety helmet according to the invention is based on an electronic system, the block diagram of which (Fig. 1) consists of the following elements:

- integrated ambient temperature sensor in front of the face,

- integrated temperature sensor on the skin surface in the forehead area,

- integrated sensor of infrared radiation or visible light for pulse measurement,

- integrated proximity sensor of infrared radiation,

- vibration motor for tactile signaling,

- connection with pins of digital binary signals and a bidirectional serial bus,

- led,

- integrated temperature sensor for measuring the temperature between the head and the helmet shell,

- control system,

- a layer reflecting the light falling from the LED diode.

The mining safety helmet according to the invention (Fig. 5) has an installed sweatband for industrial safety helmets (18). The part of the block diagram (7) that is outlined with a dashed line shows the block diagram of the electronics within the sweatband (18). The sensors (1, 2, 3, 4) are connected to the terminal (6) via a bi-directional serial bus such as for example I2C (Inter-Integrated Circuit) or SPI (Serial Peripheral Interface). The vibration motor (5) and the LED (8) are connected to the connection (6) via separate binary signals, for example where logic "0" corresponds to 0 V and logic "1" corresponds to 3.3 V Connection (6), in order to assign to a given line of input signals the corresponding output signals, has line markings. A signal that controls the vibration motor (5) is assigned to the A line. The signal controlling the LED diode (6) is assigned to the B line. A bi-directional serial bus is assigned to the C line. Then, from the terminal (6), the signals of the elements (1, 2, 3, 4, 5, 8) are connected to the control circuit (10). The sensor (9), due to the fact that it is installed in the control system (10), i.e. outside the structure of the pot (18), is connected directly to the electronic circuit of the control system (10) via a bidirectional serial bus. The layer (11) reflecting the light incident from the LED (8) is in the form of a reflective sticker attached with an adhesive to the underside of the helmet visor (24). All sensors (1, 2, 3, 4, 9) are integrated sensors, i.e. they have in their structure an analog sensor of non-electrical quantities, an analog-to-digital converter, a digital circuit for processing the digitized measured value and communication with an external controller via a two-way serial bus and single binary lines. The control circuit (10) has a printed circuit with an electronic circuit consisting of at least a power source such as a battery or a battery, a power supply unit for conditioning the power supply, a microcontroller for controlling the vibration motor (5) and the LED (8), and for data processing and communication with sensors (1, 2, 3, 4, 9), passive elements necessary for its correct operation, system for two-way wired communication. In the illustrated embodiment of the invention (Fig. 5), the integrated temperature sensor for measuring the temperature between the head and the helmet shell (9) is mounted in the control circuit (10). The control system (10) is attached to the helmet shell (19) over the head by fastening with Velcro straps to the upper side of the harness (20). The control unit (10) is connected to the sweatband connection (6) via a cable harness (17). The connection (6) mediates the information exchange between the integrated sensors (1, 2, 3, 4, 9), the vibration motor (5) and the LED (8), and the control circuit (10) and supplies the power. The measured values from the sensors are processed by a microcontroller in the control circuit (10) which activates the actuation of the vibration motor (5) and the LEDs (8). In addition to light and vibration signals, there are also sound signals in the form of a sound transducer with or without a generator, which can be placed in the sweatband (18) or in the control system (10). The harness of the helmet (20) is attached to the main strap (23) with the harness hook (22). The standard clip (21) is used to attach an additional chinstrap. Due to the fact that the sweatband for industrial safety helmets (18) is flexible, it is installed in the same way as when putting on a standard sweatband. The sweatband is put on the main helmet strap (23) in the place where the sweatband (18) is normally mounted. It is put on by sliding the sweatband over the main belt towards the bottom of the helmet in such a way that the printed circuit (14) and the material for draining

The sweatband (12) is located on both sides of the helmet headband (23) in the place where the sweatband (18) is mounted, i.e. on the inside and outside. Then, the sweatband is mounted by fixing the holes (13) on the hooks on the headband of the helmet (24). The location of the holes (13) on the sweatband (18) and the corresponding hooks on the main belt (24) depends on the helmet model. In the illustrated embodiment of the invention, the dimensions of the printed circuit (14) are smaller than that of the sweat wicking material (12). Therefore, in the figures shown in Figs. 2 and 3, the printed circuit (14) is only visible through the holes in the material (13) in the vicinity of the sensors. In other embodiments of the invention, the shape and size of the printed circuit (14) may be different, such as a smaller printed circuit (14) length of 1/4 of the length of the material (12). The shape of the printed circuit (14) can also be different, for example it can include a cable harness (17). The shape of the printed circuit (14) is then enlarged by a projecting flexible strip of the printed circuit with a connector (6) in the form of a plug at its end. The plug allows you to connect the sweatband to the socket in the control system (10). The mining safety helmet according to the invention (Fig. 5) has functions in the form of monitoring the health of the miner during the work and warning him against health hazards. Due to the harsh environmental conditions, including high ambient temperatures during work, and the nature of the work requiring high physical effort, the risk of hypothermia, i.e. overheating of the body and exhaustion of the body caused by e.g. dehydration, is a great threat to miners. Such health hazards are detected in advance by the helmet (Fig. 5) and signaled by perceptible vibrations of the vibration motor (5) and light signals from the LED (8) visible on the reflective sticker placed on the underside of the helmet visor (24). After detecting the signaling, the underground worker should stop working, leave the workplace and go to the designated place to rest. In many mines, these places are additionally cooled. Such places are located in various places of the mine in horizontal workings underground. Other cases of health hazards include mechanical injuries to the head, such as an impact as a result of a quick turning of the head to the side towards dangerous objects. In such situations, the helmet is able to warn the worker of a possible head bump against surrounding objects. Detection of these objects is carried out by integrated proximity sensors of infrared radiation (4).

Claims (11)

1. Industrial safety helmet for warning against health hazards, consisting of elements of a truss, a shell and a visor, inside which a sweatband made of replaceable material for absorbing sweat is attached, shaped to fit it in protective helmets, characterized by the fact that the sweatband has an integrated circuit a printed circuit (14) mounted with an electronic circuit which includes at least one integrated sensor for an ambient temperature in front of the face (1) connected to at least one integrated temperature sensor on the skin surface at the forehead (2) and at least one integrated sensor for infrared radiation or light signal for pulse measurement (3), and at least one vibration motor (5) for tactile signaling and at least one luminous LED (8) for light signaling, and a light reflecting layer (11) is placed on the underside of the helmet visor (24) incident from the LED (8), said electronic circuit connected to j est via the connection (6) with the control system (10), which control system by means of a vibration motor (5) and LED diodes (8) signals the exceeding of the parameters monitored by said sensors. A helmet as claimed in claim 1, characterized in that the sweatband electronics comprises at least one integrated infrared proximity sensor (4). A helmet according to claim 1 or 2, characterized in that the built-in printed circuit (14) is permanently attached to the sweatband through an adhesive joint. A helmet according to claim 1 or 2 or 3, characterized in that the built-in printed circuit (14) of the sweatband is made of a rigid-flexible or flexible material. PL 226 454 B1 A helmet according to claim 1 or 2 or 3 or 4, characterized in that the integrated temperature sensor for measuring the temperature on the skin surface at the forehead (2) is flooded with thermally conductive plastic, forming a shield (15) that passes through an opening (16) in the sweat wicking material (12) such that it protrudes by a distance of 0.1 to 2 mm. A helmet according to claim 1 or 2 or 3 or 4 or 5, characterized in that the control system (10) is attached to the helmet. A helmet according to claim 6, characterized in that the control system (10) is attached to the helmet shell (19). A helmet according to claim 6, characterized in that the control system (10) is attached to the helmet harness (20). A helmet according to claim 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8, characterized in that an integrated temperature sensor for measuring the temperature between the head and the helmet shell (9) is attached over the head to the helmet shell (19) and it is connected to the control system (10). A helmet according to claim 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8, characterized in that an integrated temperature sensor for measuring the temperature between the head and the helmet shell (9) is attached over the head to the helmet harness (20) and it is connected to the control system (10). A helmet according to claim 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8, characterized in that an integrated temperature sensor for measuring the temperature between the head and the helmet shell (9) is mounted in the control circuit (10) and is part of the its electronic circuit.