Residential Sectional Garage Door
A typical version of an overhead garage door used in the past would have been built as a one-piece panel.The panel was mounted on each side with unequal parallelogram style hinge lifting mechanism. Newer versions of overhead garage doors are now generally built from several panels hinged together that roll along a system of tracks guided by rollers. The door is balanced by either a torsion spring system or a pair of extension springs.A remote controlled motorized mechanism for opening garage doors adds convenience, safety, and security
• Aluminum garage doors are low-cost, light, rust-proof, and feature low-maintenance. They are prone to denting because aluminum is not strong and they are energy-inefficient since aluminum is a highly conductivematerial.
• Fiberglass and vinyl garage doors are composite units, combining a steel core behind a fiberglass or vinyl skin. They have also polyurethane insulated base sections, or other type of foam insulation. These premium doors can match steel garage doors, and be a realistic imitation of wood (namely fiberglass units), but they may be more expensive than steel units.
• Steel doors have become common and are available in a variety of sizes and styles, provide strength and security, are cost-competitive, and may have optional insulating value. Extra strength is available with two or three layers of galvanized steel with a low gauge number (23-24 gauge steel panels).
• Wood garage doors offer aesthetic appeal, but they are high-maintenance and may be expensive. Low-priced wood garage doors may warp and break easily.
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House stealing and robbery can happen in any period and in any country, both ancient and modern, and it not only seriously endangers people’s property and life safety, but also is a social security problem that is difficult to completely solve. Although agencies and enterprises and institutions can send people on duty to install video surveillance and alarm emergency devices, it will play a defensive role, but some cases of theft and robbery will still occur. For the general public, there is also a certain awareness of prevention. For example, early security nets and anti-theft windows have certain security effects on homes, but they expose many hidden dangers in actual use, affecting city appearance, hindering fire escape, providing thieves with favorable conditions for climbing and stealing neighbors, and rust falling and wounding. Civil disputes and so on.
In order to quickly open up the market quickly, manufacturers of alarms design bulky mounted detectors to facilitate installation by the user. This provides thieves with conditions to destroy targets or counter-alarm operations, leaving a gap between The space for committing crimes seems to be guarded. It is virtually empty. Therefore, we must not only summarize the current problems in the security alarm market, but also study the social structure of people in highly advanced economic and technological periods. When the Gini coefficient of the gap between rich and poor exceeds the internationally recognized safety line, due to the psychology of some people Imbalance, the increase of the floating population, along with the excuse forced by life, some people treat the theft and robbery as a candid profession, and return to the old business after they are released from prison - gang partners and commit crimes frequently. In people’s normal lives, although the number of thieves who steal or rob are very small, the number of people who are robbed and robbed is also a minority, but the resulting consequences have caused serious harm to society. Therefore, precautions should be taken and attention should be paid to the installation and use of surveillance and security telephone alarms.
At present, wireless smart alarms sold at the national and secondary markets have high performance, wide monitoring, and high degree of intelligence, but they have high prices and are exposed, but not only have poor anti-alarm and anti-destructive capabilities, but also have operations. Cumbersome and inconvenient. Many wireless smart alarms belong to fixed transmission and reception frequencies, fixed size, and fixed operating modes. Several problems faced by emergency telephone alarms are as follows:
1, after the decoration of the house, gives people a feeling of comfort and beauty, make people feel comfortable living. If you decorate a beautifully decorated door and window, an anti-theft anti-theft launcher with a non-modern decoration will definitely affect the decorative effect of the whole house. At the same time, anti-theft transmitters mounted on doors and windows may be subject to human intervention or may be deterred from counter-alarm action.
2, belonging to high-frequency emission of electronic products, installed in the living room and bedroom, easily affected by the interference of large appliances magnetic field, thus affecting the alarm effect.
3. Some wireless smart alarms use human pyroelectric infrared or microwave sensors. They can set up dozens of defense zones and dozens of alarm calls. They have a high degree of intelligence and are networked with the community for system management. Although these products are highly intelligent, it is undeniable that their performance is flawed or even inadequate. Pyroelectric sensors may generate false alarms for the nearby high-heat, intense light and hot air currents. When the relative temperature of the environment is close to the human body temperature, missed reports may occur, and the glass and plates are less sensitive to moving human bodies.
At the end of the last century, the Northern Song Dynasty cultural relics of the Kaifeng Museum were stolen and occurred in the monitoring range of human pyroelectric infrared burglar alarms. Microwave detectors use the Doppler frequency shift feature to monitor moving objects in the defense area. When someone enters the defense area, they will immediately report an alarm, but animals in the defense area and shaking plants may cause false alarms. Microwaves have a penetrating effect on walls and floors. If they are improperly installed, neighbors' activities may also cause false alarms. As long as any false alarm or false report of any smart alarm device will affect the credibility of consumers, it will reduce the sense of security.
4. It is relatively safe to use a door sensor as a detector. No missed report or false alarm can occur because its alarm signal is generated after the doors and windows are pushed by the external force. No committing action will not generate an alarm trigger signal, but it has a large volume and is a surface-mounted device, and it is vulnerable to hidden damage or anti-alarm action. If acquaintances commit crimes, such things are more likely to happen.
5. The alarm device with double-detection function is now on the market, and the human pyroelectric infrared detection and microwave detection are in the same group of detectors. The use of microwaves is not blocked and the performance of smoke, light, and temperature change is insensitive. This supplements the inadequacy of human pyroelectric infrared detectors, and basically eliminates false alarms through the composite detection of both units. However, this may be missed, because the human body's infrared radiation is easily blocked by walls, furniture, plates, glass, and so on. Shuangjian detector can trigger an alarm only if both units detect the invading human body at the same time. If a rogue with anti-alarm experience is encountered, it enters the zone under the cover of the glass and the plate, then the double-sense detection is difficult to trigger the alarm only with the single-sense function. Under the effect of the anti-alarm, will it not be “with the police not reporting�
6, because the current video surveillance and security alarm electronic product detectors are almost all body-mounted equipment, in the installation process and form is not only unavoidable to the perpetrators provide damage to the target, but also to the thieves to create anti-alarm conditions . When the manufacturer researches and develops intelligent products without any false alarms, it may think that the detectors are in the room. If the damage is not successful, they will be recorded or triggered, ignoring the diversity of crimes. - Open space-time, step-by-step committing crimes, using science and technology devices to commit crimes, perforating magnets to commit crimes, committing anti-alarms, using blind corners to commit crimes, etc. In order to eliminate the blind spot that has never been involved in the security and alarm industry, the home phone alarm detector can only be reduced in size and completely concealed, leaving the perpetrators with a destructive goal and creating anti-alarm conditions.
7. Smart alarms have difficult operation problems. Among low- and middle-income people, young people with thin hands may not use it. Some middle-aged and elderly people with anti-theft and anti-robbery awareness, and some even the DVD remote control key functions and how to program are not clear, the smart anti-theft alarm code recording, programming, fortification, disarming and after the occurrence of alarm quickly Processing, you may only see the "device" sigh.
What are the security risks of home burglar alarms?
With the development of science and technology, there are many video surveillance and intelligent anti-theft alarm electronic products on the market, which provide favorable conditions for security and rapid detection. Due to the wide selection of human pyroelectricity, microwaves, and door sensors as the detectors, the alarm trigger signal is obtained from the unique characteristics of the small changes in their physical quantities, but some blind spots or dead spots, as well as changes in the external environment, there are Some limitations of the physical properties of the detector will give the alarm hidden dangers of false positives or false negatives.