At present, it is popular to use the solenoid valve near the door to drive the compressed air switch to change the pressure fluid distribution of the door-driven cylinder. The driver can touch the circuit switch on the dashboard of the cab, but when the power supply is insufficient and the wires are damaged, it is easy to fail. The traditional structure is that there are two relatively large mechanical compressed air manual valves beside the driver's seat, one controls the opening and closing of the front door and the other controls the rear door, which is laborious to operate. The compressed air pipeline installed on the car body structure is long, which has a large maintenance workload, a large amount of metal materials, a large amount of metal cutting and processing, and is easy to leak. However, the reliability is high. As long as it is not a strong explosion and impact, it is not so easy to make the compressed air pipeline unblocked. At present, most of the open flames in cars are caused by circuit faults. The first correct operation is to manually turn on the main power switch, so that many initial open flames will not expand, and then put them out with a fire extinguisher. If you do this, the driver can't open the door, and it is impossible for the driver to quickly squeeze through the crowded wall to reach the front and rear doors and turn the manual emergency valve. If the bus system is adopted, optical fiber transmission will die faster.
At present, there is no fire prevention device that automatically cuts off the main power supply of automobiles. To open this big knife switch made of red copper, the stroke is long and the tension is large, which is equivalent to opening the bus bar connected with the pole pile of automobile lead-acid battery. It can be realized by initiating explosive device, electric actuator and compressed air actuator.
For a long time, the enterprises of China Southwest Military Industry System have been supplying explosive bolts to China Aerospace Department. This is the use of shaped charge high temperature and high pressure jet to cut the connecting bolts of the spacecraft, which can separate the connections at all levels of the rocket. Some designs are to remotely cut the structural parts of the spacecraft flying in the air on the ground, so as to achieve the effect of self-destruction (the structure is kept secret, the damage to the ground is reduced, the work of the rocket engine is interrupted, and the important political, economic and military targets on the ground are avoided when the spacecraft is abnormal, and the landing site is changed). Automobile anti-collision airbags and life jackets on airplanes are instantly inflated by pyrotechnic equipment.
The landing gear of modern large aircraft has redundant multi-opening devices. When the hydraulic drive fails, compressed air energy is used to release the landing gear. The bus door should have a multi-power opening structure, which can be used to forcibly open the door when the car body is not deformed, the door is stuck by the deformed car body, and the door is squeezed by many passengers, so that the trapped passengers on the bus can be evacuated in time. This is controlled blasting technology, such as some national currency and some kitchen knives, which uses controlled blasting technology to weld metal plates with different properties together; This method is first applied to the production of military equipment and space technology equipment materials. On the soft ground (not fried on the hard ground) and in the pool, there are many layers of metal plates and a layer of explosives on them. After the explosive is detonated, explosive welding can be realized, and the metal composite material after explosive processing rolls flat on the machine tool. For example, a high-grade kitchen knife has a hard and slightly brittle metal material in the middle and relatively soft metal materials on both sides. After the blade is cut for the first time, the blade can remain sharp for a long time. This is the self-sharpening technology, which is the essential feature caused by the difference in wear speed between the middle and the two sides of the kitchen knife during use. This is the field of explosive mechanics and fluid mechanics, and one of the highest technologies is the detonation of nuclear weapons. The size, shape and spatial distribution of this nuclear material, the location of high-energy explosives, the number and equivalent of detonation points, and the precise control of detonation time and phase of each detonation point are all profound knowledge and difficult engineering technology.
Adding a switch at the horizontal distance of one meter between the outer surface and the inner surface of the bus can trigger the switch to forcibly open the door; In order to prevent one person from maliciously triggering the switch or passengers in the car from being crowded and mistakenly triggering the switch, to prevent thieves and robbers from escaping from restraint control, and to put an end to the chaotic waves caused by unauthorized operation, only when multiple switches are pressed at the same time within the space distance exceeding one person's scale, or remote control is carried out by a remote monitoring center, can the door be forcibly opened. In the design and manufacture of hardware, redundant, multiple, waterproof, fireproof and anti-collision measures are fully adopted to prevent vehicles from damaging local structures; This is more scientific, effective and timely than the non-standard methods of hitting the car window with human body, limbs, feet, temporary crude tools, unprofessional demolition tools, iron sand palms, iron fists and hard qigong heads in an emergency. No matter when the car body falls into the water and is deformed by water pressure or collision, it can open an escape route in time to evacuate passengers quickly and timely.
At night, when the bus is parked in the parking lot, the system is shut down to prevent theft and damage.
Emergency evacuation doors should be opened on both sides of the bus with initiating explosive devices, and emergency call buttons should be installed on the inner wall of the bus at horizontal intervals of one meter. If passengers press more than three emergency call buttons at the same time, they should brake the vehicle forcibly first, and then immediately blast the emergency evacuation door by controlled blasting, so that passengers can step out of the car smoothly, timely, safely and orderly without climbing or jumping out of the window. Drivers are restricted by the rules and regulations of the transportation company and their jobs, so they dare not stop first. For example, on the bridge and in front of the office, they may be punished for making mistakes and lose their jobs. It does not rule out that the driver suddenly loses consciousness. However, the collective electronic voting of passengers decided to smash the window to open the door, which was timely and accurate, and the law failed to cure everyone. Because of the self-protective operation made by misjudging the situation, it is impossible for the transportation operation company to punish a passenger, otherwise the strong social, economic and legal pressure will cause some passengers to have mental breakdown and family breakdown. At the same time, there is no room for pranksters and saboteurs to engage in illegal activities and create social chaos.
The unique advantage of this technology lies in that it opens a wide passage, and the trapped passengers can evacuate and escape smoothly, and behave appropriately, especially the girls can keep elegant and ladylike manners in times of crisis. This kind of rescue device can be reused without being lost, which can restore the operation of vehicles in time, ensure the traffic order of modern cities and ensure the economic interests of traffic operation departments. In contrast, the method of breaking the window glass is costly, destructive, and has additional secondary injuries. The damaged window glass is non-renewable, and it takes time and resources to reinstall the glass. It is not environmentally friendly, advanced, primitive, and outdated in thinking and technical means, which is not worth promoting. What era is it now? And the lowest position of the door from the ground is lower than the lowest position of the window from the ground. The escape environment of opening the door is better than that of opening the window. The flame jumps high first.
Install spare compressed air accumulator, hydraulic accumulator, spring accumulator and spare battery on the bus, and use supercharger if possible (this is different from the supercharger of automobile intake now, and it is a traditional cascade compressor). In case of emergency, passengers collectively voted to start the standby solenoid valve by using the fully localized PTFE insulated high-temperature conductor (commonly known as aviation line) 30 years ago, braking the vehicle first and firing a signal flare at the rear of the vehicle. Prompt follow-up vehicles to avoid, shoot three red flares into the air, call fire engines and ambulances to assemble in place quickly, call the masses to come to rescue, and then forcibly open the door through the original cylinder or spare cylinder. It is completely existing and common pneumatic technology, and uses all standard industrial equipment standard parts. In the manual of domestic mechanical and electrical products 30 years ago, you can find pure domestic products. The liquid, gas valves, pipes and pipe joints on China manned space suit are all standard parts of this kind, but the difference is that the materials, processing accuracy, reliability and production enterprises are different from the requirements of ordinary industries. To put it simply, according to the mechanical design manual published by China 30 years ago, a manual mechanical clutch is added to the vertical shaft of the door. For departments with good machining conditions, it is suggested to use emergency handle to cut off the switching pin, and then use electromagnetic clutch for the next stage.
The focus of the existing bus modification is the door, which is also the only indicator of the superior assessment. The original method of knocking on the glass is not worth encouraging. It is the initial instinctive reaction of passengers. Providing safety hammer has won the legal initiative for passenger transport enterprises. The policy of senior leaders is: when there is danger, take the lead in opening escape routes for passengers who make a dash for the door. For those who come out of the window, they are free to choose their own behavior and take responsibility. I don't nod or shake my head. If I am injured in this process, the transportation company will reduce the compensation amount. Only when the threat of high risk level appears can the glass window be broken pneumatically. This non-destructive, economical, applicable and reusable design scheme should be regarded as the standard configuration, manufacture, operation and safety standard of passenger cars.
Before boarding the train, passengers can do the actual operation by themselves, train in actual combat, real scenes and real environment, try to trigger the low-level forced door opening operation by themselves without breaking the window, and invite passengers to operate the emergency safety door opening device on the train by themselves (the emergency switch installed on the train should be operated by passengers themselves now), so as to win the trust of passengers, rebuild their confidence and restore their sense of security by demonstrating highly reliable, nondestructive and effective measures. Nowadays, space science and technology are all boastful and illusory, and doctoral academicians are flying all over the sky. We ordinary people hope to regard this as truth, hope to see it, feel it, experience it reliably and use it at critical moments. What is the name of this new word? Oh, it's an interactive experience, and the man-machine interface is friendly; Exhibits, sample cars, TV newspapers and advertisements are all considered transparent, virtual and virtual. Practice is the only criterion to test the truth, that is, it needs to be operated repeatedly for a long time under the condition of using the site to expose the unrecognized defects in design and processing. Passenger vehicles that meet this standard can post trustworthy signs such as "Safe Car" and "Love Car", charge reasonable and slightly higher fares, and order local departments of price, industry and commerce, technical supervision, safety production supervision, public security, fire protection, disaster relief and disaster reduction to cooperate with each other. This is the way of socialist cooperation and joint research in the past. For all kinds of losses caused by the action of various emergency opening devices, insurance is insured in insurance companies, and new varieties of special insurance claims insurance products are set up in insurance companies.
The Policy Research Office and the Development Research Center organized the State Economic and Trade Commission, the National Development and Reform Commission, the Ministry of Finance, the People's Bank of China, the China Banking Regulatory Commission, the China Securities Regulatory Commission, the China Insurance Regulatory Commission, the State Administration of Foreign Exchange, the State Administration for Industry and Commerce and other government financial departments to jointly hold relevant working meetings. This is the legislative research and judicial practice innovation of China's financial legal system, and it is necessary to study how to carry out relevant overseas listing work.
Bus companies all over the country, such as Wuhan Bus Company and Shenzhen Bus Company, have invited passengers to smash windows on buses, which is tantamount to training thugs, thugs, killers, gangsters, lunatics, lunatics, terrorists, troublemakers and saboteurs, and creating unruly people with no fear and distorted mentality. Nowadays, safety hammers are popular on the Internet and in physical stores. Passengers expect to smash the window as soon as they get on the bus, and they can't wait to start work at the slightest sign. This is too arrogant, crazy, extreme, horrible, arrogant, crazy, violent! They are all crazy, they are cultivating and encouraging evil mentality! Is to create a criminal tendency! What a scandal! Instead of thinking about taking the sunshine avenue in the vehicle structure first, and expecting to open an unconventional passage by destructive means without authorization, this starting point and position are completely wrong. In view of the farce that passengers smash buses when they are slightly disturbed all over the country (see the annex at the end of this article), the government should strengthen positive guidance and guide healthy and positive social trends and public opinion through scientific and technological progress, which is the unshirkable social responsibility, obligation and job of the government and bus companies, and must resolutely put an end to passengers' anxiety.
Faced with the common technical failures and artificial agitation of buses around the world, passengers have taken extreme measures to break the window glass to escape. At present, the bus company is riding a tiger and is in an embarrassing situation. If you swallow the knocked-out front teeth, you will be in trouble. They dare to be angry and dare not speak, and the dumb eat coptis, speechless, depressed and afraid. It is not a long-term solution. They suffer indignities between their superiors, society and passengers. What can they do?
Bus operating companies should open all kinds of existing essay papers on door cranes to the whole society, provide students and citizens with scrapped buses for safety transformation experiments free of charge, provide relevant venues, tools, materials and processing equipment, and establish teaching innovation and employment practice bases. This is a measure for Scientific Outlook on Development's social welfare, social harmony, popularization of science and technology, improvement of the scientific quality of the whole people and correct public opinion orientation. Relevant technical measures should be widely collected from the whole society, and whether they are adopted or not is another matter. At least we can immediately divert some people's attention, arouse social concern, and strengthen corporate image through the construction of corporate culture. It is of great significance for sustainable development and social progress for public transport operators to provide improved experimental sites and expenses. However, it is inappropriate to call on passengers to smash bus windows, and resources are non-renewable, non-reusable and non-value-added, with poor social effects, bad motives and violent tendencies, which promotes the wrong development of abnormal psychology.
The State Administration of Work Safety will hold a joint meeting of ministries and commissions tomorrow and go through the procedure. The Ministry of Industry and Information Technology, the Ministry of Public Security and the Ministry of Transport of the People's Republic of China should formulate new technical specifications for the safety structure of passenger cars and cars, and add national standards and fire protection standards for passenger cars and cars as the basic requirements of the Catalogue of Passenger Cars and Cars. Buses and cars produced by enterprises must enter the national catalogue of motor vehicle products in order to obtain the license plate and certificate issued by the vehicle management office and drive on the road.
The design, production, testing and certification of building fire doors are important fire safety issues involving human life, and the state has very strict management of fire doors. The production license for fire doors shall be examined and issued by the fire departments of all provinces, autonomous regions and municipalities directly under the Central Government. In view of the painful and profound lesson of Chengdu bus fire on June 5, 2009, the Ministry of Public Security will seriously deal with bus doors as fire escape doors in the future, that is, fire doors, escape doors and fire escape doors. The Ministry of Public Security will formulate the world's first relevant standard and incorporate bus doors into routine fire inspection projects.
In the future, cars and buses imported from abroad should meet these national standards in People's Republic of China (PRC), apply for national patents, authorize foreign production, and collect patent authorization fees. Foreigners should listen to us and do as we originally asked. People's Republic of China (PRC), the General Administration of Customs and the General Administration of Quality Supervision, Inspection and Quarantine will carry out the preparatory work for related coded goods. These are the fashionable words at present: first-class standards, second-class design, third-class products, fourth-class sales, fifth-class maintenance services, and finally the end consumers, sorry, wrong, and finally the recycling department of recycled materials. This work fully embodies the care and love of the China government for its citizens, and it is solemnly exercising national sovereignty. Relevant laws and regulations should be formulated as soon as possible and submitted to the National People's Congress for approval, promulgation and implementation.
The spontaneous combustion rate of buses in a country truly reflects, refracts and embodies the industrial capacity and national quality of this country to some extent. The design rigor, structural rationality, reliability, precision, durability and technological level of bus fire doors truly, accurately and comprehensively reflect the industrial foundation of a country. The Ministry of Science and Technology should organize local scientific research institutes at all levels, local science and technology departments and science and technology bureaus to carry out the improvement of bus doors with independent, independent and independent intellectual property rights, and determine the first national bus safety design and actual test competition as soon as possible on the basis of local progress reports. This is a major issue concerning the people of all ethnic groups, public safety, public opinion and social stability. Continue this work, the party and the people should rest assured.
The existing standby door opening switch pulled by the driver and the emergency manual door opening switch above the passenger's rotating door are compressed air pressure relief valves, so even if the gas in the door opening and closing cylinder is released to atmospheric pressure, it needs time delay; What's more, bus doors are all combined with rotary motion, hinge linkage mechanism and guide rail. Therefore, when the passengers in the car are crowded, the cylinder can neither close nor open the door, and it can only be realized with the assistance of people inside and outside the door. The direction of pushing and pulling force should follow the arc trajectory, which is only for a single door with two doors, and it is more complicated for a folding door with four doors. Even after the cylinder of the door is completely decompressed, this manual door opening action cannot simply pull or push the door outward, which is completely different from the simple and monotonous rotation track of the door leaf in the building. Even if the driver starts the existing emergency switch, the door is still linked with the piston in the cylinder. Under the damping function related to speed function, the faster you push the door, the greater the reaction force, and the more difficult it is to open the door!
So the simple method is to open a hole for opening and closing the door on one side of the cylinder, tap the thread, install the initiating explosive device with one end closed to the atmosphere, and ignite it to force the door to open in an emergency. No matter what the state of the cylinder just now, the direction of the piston being compressed by air at present, and whether the cylinder is depressurized or not, the door can be forced to open with higher pressure expansion gas. This function generated in the original design mechanism is the most effective. With this structure, the initiating explosive device can resume operation immediately without on-site maintenance after working, and the original opening and closing operations can be continued. After returning to the motorcade, the initiating explosive device can be unscrewed and replaced with a new one to restore the safe state. You can also use fireworks to blow off the support of the connecting rod and the rotating shaft of the door, so that the door will disintegrate and fall off. One of the ways to improve the window structure can be to set many hidden doors that can be blasted under the window, so as to reduce the crossing height of passengers in emergency and reduce the obstacles to escape. These hidden doors are usually load-bearing structural members on the car body.
Many netizens have noticed that when the 2008 Beijing Olympic Games is coming to an end, in the London 10 minute program performed by the host city of the next 20 12 London Olympic Games, the car body shells on both sides of the British double-decker bus can be completely opened, which is an ideal fire safety structure; Some netizens also made a simple single-decker bus model, and the body shells on both sides can be completely opened similarly, and you can upload your own videos. From the perspective of industrial technology, the British performance car has undergone technical transformation, adding a hydraulic pump and a hydraulic workstation driven by the main engine of the car, and driving the body shell to open through a long-stroke hydraulic cylinder. The reason why he is not pneumatic is that the long-stroke driving speed of pneumatic actuator is not so uniform, the pneumatic speed is fast and the pneumatic controllability is poor, so it is difficult for several pneumatic structures to be unfolded at the same time. If you want to add similar functions to the bus, it is impossible for the bus to carry a large number of passengers with a hydraulic station and a large number of fire-fighting equipment. The appropriate method is to drive the cylinder with a compressed air energy storage container. After the passenger forcibly brakes the vehicle, he will use a manual valve to introduce compressed air into the cylinder to open the door. If the cylinder is driven by disposable initiating explosive device, the structure is smaller, and the weight and volume of the system that also stores energy are small, which is specific power weight density and specific power volume density in professional terms. However, the high-speed opening action on both sides may hurt other vehicles and passers-by. The ideal way of action is to move the guardrail down or up in parallel.
Only tripping and unlocking actions require short stroke, small thrust or torque, and are simple. If passengers don't push open the window, but adjust the power, the journey is long and the thrust is large, which is a bit high for China's industrial base.
If the glass window slides down and retracts into the body and is driven by the gravity of the earth, the structure will be simple. Pay attention to deceleration, shock absorption and collision avoidance unless it is used once. If PC polycarbonate window is used, it has low transparency (not conducive to lighting), light weight and high cost. Because the hardness is not high, it is easy to scratch, and the biggest disadvantage is that it can't be broken after plating the hard film.
At present, it is popular to fix the automobile glass window on the car body with layering, sealant and frame, which has simple process, beautiful appearance and low cost. The sliding window has a guide rail and a frame to limit the degree of freedom. Just add a railing. However, it is very difficult to design the structure of windows that need to be opened repeatedly. Generally, it is necessary to redesign the overall structure of the bus, and the safe and reliable insurance structure is also more troublesome. During normal driving and parking, it is absolutely impossible to accidentally trigger the opening, resulting in a major accident in which passengers fall to the ground.
In aviation and spacecraft, hydraulic devices are widely used to drive the rudder surface, retract the landing gear, retract the hatch cover, release weapons, etc., because of their high working pressure, rigorous design, excellent materials, accurate technology, small size and light weight.
At present, the common hydraulic door closers for security doors and lobby doors all use springs as energy storage mechanical elements, which are buffered by unidirectional damping hydraulic elements. At present, domestic hydraulic door closers are not durable. Bus windows can be pre-installed with door closers, which will automatically open when unlocked in an emergency. The existing structure is big and heavy.
More than 30 years ago, countries in Europe, America and Japan integrated compressed air accumulators with power cylinders. Firstly, it is used for passive buffering and damping in industrial production equipment. More than 30 years ago, it was used for automatic lifting and opening of automobile rear door. At that time, there were only cars and vans imported by the provincial party Committee, and most people didn't know. It was widely used in seat lifting and energy storage 20 years ago, and now it is often used as passive power-assisted devices such as positioning, opening and maintaining closing torque of horizontal doors and vertical doors of high-end household cabinets, and can also be used in bus safety mechanisms. This can be seen in many cars, and the structure is exquisite.
More than 30 years ago, European and American countries produced electric roller blinds and electric mechanisms that drive large building windows with linear motion. Its appearance was originally popular with the traditional worm gear transmission pair, but it was improved to a cylindrical structure with compact structure and more complicated processing more than 20 years ago, and a screw transmission pair was used inside. From the appearance, it is a round rod that can expand and contract slowly. In recent years, domestic manufacturers have swarmed in, and the sales volume is not large. Generally, its interior is an AC motor with a power supply of 220 volts, and this mechanism driven by a low-voltage DC motor can also be produced in China. If it is used for bus emergency window opening, the action speed is not as fast as that of cylinder. If we want to ensure multiple redundancy, we need to distribute batteries in the bus structure, which is bigger, heavier and more unreliable than cylinders, especially passive cylinders.
The traditional injection molding machine is driven by hydraulic system to open and close the mold. A few industrialized countries adopt all-electric drive, which is more stable, controllable and faster. This is entirely based on a solid industrial foundation and has no necessary connection with information technology. This is called an all-electric injection molding machine.
It is easy to "bomb" initiating explosive device, but it is difficult to use electric actuator. Don't you think that all the electric actuators of Chinese subway screen doors are designed and produced abroad, or some of them are joint ventures? In other words, it is relatively easy to build a large launch vehicle, but it is difficult to build a large aircraft that is economical and applicable and can be reused for a long time.
At the beginning of the Cultural Revolution, buses with log bodies and log glass window frames were still in operation in China. At that time, military trucks also used wood as the fence and rear flap, so the burning speed of wood body was not as fast as that of synthetic materials now. You can ask the volunteer veterans who went to the Korean battlefield that year. It was not until 1953 that China began to mass-produce trucks by industrial means. At that time, Chinese people's Volunteer Army's trucks on the Korean battlefield were all made in foreign countries. At that time, North Korea's air superiority was weak. On the transportation line, bombed cars can be seen everywhere, and bombed trucks can be seen everywhere, but it is rare for trucks to catch fire. Alas, the world is getting worse, people don't miss the past, and each generation is worse than the next. This car catches fire more and more easily. Is it the fault of impetuous people? Good car, burned without anyone bothering it, such reports have been common, normal, sad, sad!
The fashionable window is smoothly connected with the outer wall of the car body, with simple manufacturing process and low cost. Now the bus company refits air-conditioned cars and installs movable sliding windows, which is an extremely common, mature, ancient and traditional existing structure. Historically, from wooden frames to iron frames and then to aluminum alloy frames, ordinary decorators can skillfully complete them. Just back to the old routine, back to the original shape, restoration, reform failed. It is not worthwhile to refit such a bus safely. Have you noticed how many windows the plane can open?
When you pay the fare in full according to the regulations, you immediately establish an unbreakable legal contractual relationship with the bus operation company. The driver received strict emergency training before taking up his post, so when your fragile, petite and crystal clear body like Lin Daiyu caught the driver's eye, he gritted his teeth and made up his mind to defend your soft, fresh, wonderful, precious and sexy life with his own flesh and blood.
An anonymous netizen on the Internet asked: Which location is easier to avoid danger or drive away? Of course, first of all, we must unite around the free hired rescue drivers. If the front door can't get out, we'll go out through the cab door. According to public reports, passengers escaped from a bus burning accident in Chengdu on June 5, 2009.
The following online videos are worth watching by the anonymous netizen above:
/pg/topicdetail/topicPlay.php？ tid=2839966。 uid= 1354076857。 t=2#2 143590 1
Passengers with minor injuries in Chengdu said that the driver jumped out of the window first to escape.
Behind the driver's seat, there are often crowbars for removing tires, crowbars, iron drums for adding water to the car water tank, large wrenches, triangular pillars for preventing tires from sliding, and generally fire extinguishers are placed. This is a small life-saving arsenal for everyone to use alone at the same time, and it is much heavier, easier to obtain and larger in physical size than the safety hammer that breaks the glass window.
The future development direction is to take the car stop announcer, car video player, car display screen, seats and handrails as inertial weapons, quickly and forcefully remove them and give them to the passengers behind the car, and realize them through these material foundations: mobilizing the masses, mobilizing the masses and arming them.
In some air-conditioned cars, the glass windows on both sides of the rear can be opened freely by passengers. If you occupy this vantage point, you can control your own destiny. You can't wait, rely, ask, pray or beg at the critical moment. It should be noted that this kind of window is often equipped with railings to prevent passengers from getting off when opening the window. It is inappropriate and inconvenient to travel between life and death here. An improvement is that in an emergency, the passenger collective voting device is used to unlock and separate one end of the railing connected with the car body, and the other end is a flexible universal joint.
Under the assumption that the door can't be opened (netizens call it the gate of hell), the structural obstacle of four doors is greater than that of two. If two doors are separated by upper and lower integrated glass, it is easy to break open a larger escape space outside. Note that there are often several metal railings under the door leaves to prevent passengers from falling off the vehicle when it is driving. It can also be used as an armrest, and it can also prevent passengers from hitting the glass with their luggage. Some doors use a whole piece of metal here.
At present, iron palm leather shoes are selling well, involving heavy labor insurance shoes and martial arts shoes. On the street, especially in front of the bus at the bus stop, the professional leather shoes repair shop with fixed business is booming, which provides passengers with an invisible protective weapon to kick the window. It is necessary to clearly understand the existing laws and regulations: hardware tools such as hammers, fire extinguishers, bricks and stones carrying safety hammers are not allowed to take airplanes and subways! This is a typical offensive weapon, which threatens the safety of vehicles and passengers, creates public panic and provides living space for heavy leather shoes with iron palms. At present, the production and modification of all-metal bottom high-heeled shoes have been flourishing. Companies that produce satchels and backpacks also missed this business opportunity, and regarded the safety hammer as a fashionable standard configuration and decorative hanger. The folding umbrella with the tip made of depleted uranium alloy and tungsten alloy has won the invention patents of the United States, Europe and Japan, and it sells well in the international market, taking into account the anti-robbery weapon. Similar products sold in China are made of cheap materials containing lead. Steel belt buckles are on the market, mobile phones with all stainless steel shells are on the market, and hard-nailed briefcases are on the scene. High-density hard materials are used as inertial bodies to break car windows.