Safety hammers are most effective at glass corners

A series of car safety accidents have caused alarms for everyone. How can passengers save their lives in the face of unpredictable dangers in the face of cramped space and fleeting opportunities?

This time, the curious laboratory will focus on buses. Some people think that in times of crisis, they can break through the windows with strong kicks. Others say that high-heeled shoes, keys, fire extinguishers, and other hard objects can break the glass and escape. Which way is the most effective? Yesterday, with the assistance of Zhuzhou Public Transport Co., Ltd., a lab reporter tried for you one by one.

Purpose of the experiment: Test which items can break the bus glass in the shortest possible time.

Experimental bus: a scrapped bus with good glass on both sides;

Experimental items: a string of key chains, a wooden high-heeled shoes, a hammer of about 2 kg, a safety hammer;

Test method: Hit the bus glass with the above objects respectively and observe whether the glass is smashed. In addition, hit the corner and center of the glass with a safety hammer to see if the glass was smashed and the time required.

[experimental site]

The best way to break the window with a hammer is to increase the force generated by the test object in the first three steps.

Punching the glass with a key has little effect and does not allow the glass surface to oscillate. Using high-heeled shoes, the surface of the glass reacted and buzzed. However, it struck dozens of times. In the case where the bottom of the shoe had collapsed, it still failed to spoil the glass. The sound of hitting with a hammer is the greatest, but it does not mean that it can bring results. After ten years, the reporter’s hands were already sour, and no cracks were found on the surface of the glass. Only a round mark was left on it.

The best one is still a safety hammer. In the fourth step, gently tapping the corner of the glass for 2 consecutive times, you can see a small hole in the glass, and once again, the glass breaks, and the green shards are scattered like snowflakes. When the middle part was knocked on, another piece of glass was changed and the glass was broken for five consecutive times.

[Experiment result]

Keychains, high heels, and hammers are difficult to break through the bus glass. 1. Even if you constantly apply force to a spot on a piece of glass, the keychain, wooden high-heeled shoes, and hammer cannot break the bus glass, and the hammer can easily Broken glass.

2. When using the hammer, the time it takes to beat the corners of the glass is shorter than in the middle.

Beats most effectively at 4 corners and edge positions [Analysis]

In the four corners and edge positions, the most effective test results were obtained. The reporter interviewed Ouyang Bin, technical staff of Zhuzhou Public Transport Co., Ltd. He introduced 20 years of experience in bus maintenance. The glass in a bus is generally tempered glass. When it is a matter of life and death, it is forced to tear down the safety hammer on the side of the glass. “Beat on the four corners and the edge position is the most effective way to escape. ".

"If you use force, then use a hammer to knock hard once, then you can break the glass." Ouyang Bin said, with a pointed hammer hammer hit, the glass force surface is very small, can quickly break it. The other three kinds of test items are either “big face” or “hard to force”.

Ouyang Bin also mentioned that if you don't find a hammer, metal head high heels and belt buckles can also break the bus glass. There are two ways to use the belt buckle. One is to tie the belt on the hand and hit it with a metal part; the other method is to use a metal buckle to beat the glass window.

In addition, passengers must pay attention to safety when hitting. To avoid being hit by glass shards, it is best to use clothes to wrap the hand.

In addition to wearing glasses, Ouyang Bin also introduced two methods of escape: For most buses, three emergency door valves are located on the top of the bus, one near the front door of the bus and the other two on the upper side of the front and rear doors. In the event of an emergency, the public can open the valve, twist the middle red switch, and force the cart door so that the door opens automatically. There is also an escape window on the roof, which is opened in a manner similar to that of an emergency valve.

[remind]

Caring for safety hammers can be a key moment

1. If in non-special circumstances, knocking on the bus glass is a violation of public property, it will be punished accordingly;

2. According to the assistant manager of Zhuzhou City Public Transport Co., Ltd. Qi Long: “At least about 100 bus safety hammers are damaged every month. In order to prevent accidents, please ask the public to take a look at the safety hammer on the bus.” So that it can show its talents at a critical moment."